Answer:
C
Explanation:
Since the energy required to overcome the intermolecular forces in a liquid is typically less than the energy required to overcome the stronger intermolecular forces in a solid, it is easier for the molecules in a liquid to gain enough energy to break away from each other and become a gas.
A In solids, molecules are more tightly held than in liquids.
The statement that molecules are more tightly held in solids than in liquids best explains why, under ordinary conditions, most materials change to the gas phase from their liquid phase rather than from their solid phase.
In solids, molecules are held together by strong intermolecular forces, such as metallic bonds, ionic bonds, or covalent bonds. These bonds keep the molecules in fixed positions, resulting in a rigid structure. The molecules in a solid have limited freedom of movement and are closely packed together.
In liquids, on the other hand, the intermolecular forces are weaker compared to solids. The molecules have more kinetic energy, allowing them to move more freely. While the intermolecular forces still exist in liquids, they are not strong enough to hold the molecules in fixed positions like in solids.
When a substance is heated, its molecules gain more kinetic energy. In the liquid phase, the increased energy allows the molecules to overcome the intermolecular forces and break away from each other, transitioning to the gas phase. In contrast, in the solid phase, the intermolecular forces are stronger, and the molecules require even more energy to break away from their fixed positions and transition directly to the gas phase.
Therefore, because molecules are more tightly held in solids than in liquids, it is more common for materials to change from the liquid phase to the gas phase under ordinary conditions.
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Select the equation that has the following mole ratio:
2:6:2:3
The chemical equation which has the given mole ratio is 2 Al + 6 HCl → 2 AlCl₃ + 3 H₂.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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Question 10 of 35
The graph shows the change in temperature of a sample
of water in a closed system as thermal energy is added
over time.
Temperature (°C)
150°C
100°C.
50°C-
g
0°C-
-50°C
10
20 30 40 50
Time (min)
What happens to the temperature of the water when it begins to melt?
OA The temperature remains at 100°C until the change of state is
complete
B. The temperature continues to increase during the change of state
C. The temperature continues to decrease during the change of
state.
OD. The temperature remains at 0°C until the change of state is
complete.
Answer:
D. The temperature remains at 0°C until the change of state is complete.
Nitrogen's electronegativity value is between those of phosphorus and oxygen.
Which of the following correctly describes the relationship between the three values?
A. The value for nitrogen is less than that of phosphorus because nitrogen is larger, but greater than that of oxygen because nitrogen has a greater effective nuclear charge.
B. The value for nitrogen is less than that of phosphorus because nitrogen has fewer protons but greater than that of oxygen because nitrogen has less valence electrons.
C. The value for nitrogen is greater than that of phosphorus because nitrogen has less electrons, but less than that of oxygen because nitrogen is smaller.
D. The value for nitrogen is greater than that of phosphorus because nitrogen is smaller, but less than that of oxygen because nitrogen has a smaller effective nuclear charge.
The correct relationship between the three values will be the value for nitrogen is greater than that of P because N is smaller, but less than that of O because N has a smaller effective nuclear charge.
Electronegativity is the chemical property which describes the tendency of an atom or a functional group which attract electrons toward itself. The electronegativity of an atom will be affected by both its atomic number as well as the distance that its valence electrons reside from the charged nuclei.
The electronegativity of phosphorus will be 2.19 is much less electronegativity than to the nitrogen. The electronegativity of nitrogen will be 3.04. 4. Phosphorus will expand its valence shell to hold more than eight electrons, but nitrogen cannot.
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Based on the molecular views, classify each substance as an atomic element, a molecular element, an ionic compound, or a molecular compound.
A molecular compound is defined as a molecule whose formula states the actual number of atoms bonded together in the molecule.
The atoms are joined to give a definite shape which is defined by the angles between the bonds and by the bond lengths. Molecular compounds can contain discrete molecules, which are held together by sharing electrons in covalent bonding.
Examples of molecular compounds are water, which contains H2O molecules; methane contains CH4 molecules; and hydrogen fluoride, which contains HF molecules.
As a rule of thumb, compounds that are involved in a metal binding with either a non-metal or a semi-metal will display ionic bonding.
Compounds can be composed with only non-metals or semi-metals and non-metals will display covalent bonding and will be classified as molecular compounds.
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Which of the following compounds would not be considered highly polar?
alkenes
alkanes
ethers
Given that ether is a more polar solvent than n-alkanes, it is anticipated that it will be more competitive in interactions of the dipole-type and as a hydrogen-bond base.
What one of the following compounds best exemplifies polarity?When two atoms form a polar covalent connection, a pair of electrons are unequally divided between them due to the electro-negativities that differentiate them. The name "polar covalent compounds" refers to these substances. An illustration of this is the electro-negativities of HCl, where each is different.HCl is a polar molecule because of the significant difference in electronegativity between the H and Cl atoms.Given that ether is a more polar solvent than n-alkanes, it is anticipated that it will be more competitive in interactions of the dipole-type and as a hydrogen-bond base.To learn more about polar solvent refer to:
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You add 9.6g of iron to 23.60mL of water and observe that the volume of iron and water together is 24.82mL. Calculate the density of iron…. Express in Value & Units
Answer:
7.87g/mL
Explanation:
density is mass/volume...
you add 9.6g of iron. that is the mass
the water increases by 1.22ml, that is the volume
9.6g/1.22ml = 7.87g/mL
a student measures the volume of a gas sample at several different temperatures. the results are tabulated as follows:
a. The temperature of a gas is directly proportional to its volume
c. The temperature-to-volume ratio of a gas is constant. are the correct options.
Determine the temperature to volume ratios using three significant figures:
298 / 4.55 = 65.5
315 / 4.81 = 65.5
325 / 4.96 = 65.5
These figures then demonstrate a constant temperature-to-volume ratio, which may be represented mathematically as follows:
Volume x Temperature has a straight proportional fluctuation of constant (the volume increases in a constant proportion to the increase of the temperature).
A gas's volume and temperature are inversely proportional. A gas always has the same ratio of temperature to volume. The data in the table show that volume increases at the same rate as temperature.
complete question:A student measures the volume of a gas sample at several different temperatures. The results are tabulated as follows:Temperature of gas (K) Volume of gas (L)
298 4.55
315 4.81
325 4.96
335 Formulate a tentative law from the measurements.Check all that apply.
a. The temperature of a gas is directly proportional to its volume.
b. The temperature of a gas is inversely proportional to its volume.
c. The temperature-to-volume ratio of a gas is constant.
d. The temperature-to-volume ratio of a gas isn't constant.
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Please hurry
Which of these substances would likely
increase in ocean water when nearby
rivers flood?
J Carbonate
K Sulfate
L Potassium
M Nitrate
Answer:
M - Nitrate is likely to increase in ocean water when nearby rivers flood.
Explanation:
As the nitrogen compounds are carried into the ocean, the nitrogen can be used by phytoplankton and other marine organisms, which can lead to a bloom of these organisms. This in turn can lead to an increase in the concentration of nitrate in the ocean water.
Consider the balanced reaction:
C3H8 + 5 O2 → 3 CO2 + 4 H2O
How many mol of C3H8 must be consumed via this reaction to produce a partial pressure of 3.68 atm of CO2 in a 4.00 L container at 355 K?
The number of moles of C₃H₈ that must be consumed via the given reaction is 0.168 mole
How do I determine the number of mole of C3H8 consumed?We'll begin by obtaining the mole of CO₂ produced. Details below:
Pressure (P) = 3.68 atmVolume (V) = 4 LTemperature (T) = 355 K Gas constant (R) = 0.0821 atm.L/Kmol mole of CO₂ (n) =?PV = nRT
3.68 × 4 = n × 0.0821 × 355
Divide both sides by (0.0821 × 355)
n = (3.68 × 4) / (0.0821 × 355)
n = 0.505 mole
Finally, we shall determine the mole of C₃H₈ consumed by the reaction. This is illustrated below:
C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O
From the balanced equation above,
3 moles of CO₂ were obtained from 1 mole of C₃H₈
Therefore,
0.505 mole of CO₂ will be obtained from = (0.505 × 1) / 3 = 0.168 mole of C₃H₈
Thus, number of mole of C₃H₈ consumed is 0.168 mole
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Using the formula, 2n^2 to find the maximum number of electrons in an orbit (shells), identify the elements that have incomplete shells.
A. Helium (Z = 2)
B. Zinc (Z = 30)
C. Argon (Z = 18)
D. Neon (Z = 10)
The elements that have incomplete shells are Zinc (Z = 30), Argon (Z = 18).so, option (b) (c) is correct.
What is element ?
A crucial component of a whole. a simple substance that cannot be divided into smaller components or transformed into another substance is referred to as in chemistry. Atoms, which are made up of protons, neutrons, and electrons, are the building blocks of an element. One element has a fixed number of protons in each of its atoms.
What is shell?
An atom's outermost region, which surrounds the atomic nucleus, is known as the electron shell. It consists of a collection of atomic orbitals with the same value of the fundamental quantum number, n. One or more sublevels, or electron subshells, exist within electron shells.
Therefore, elements that have incomplete shells are Zinc (Z = 30), Argon (Z = 18).so, option (b) (c) is correct.
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Which of the following options correctly reflect the relationship between SI units and units containing decimal prefixes? Select all that apply. Check all that apply. O 1 millimole contains 1000 moles. 1nm-10 m; hence there are 10° nm in 1 m. O There are 1000 g in one kg. O There are 10 microseconds in 1 second.
There are 1000 g in one kg. It is a correctly reflect the relationship between SI units and units containing decimal prefixes.
What is meant by SI units?
Other coherent derived units may be expressed using a combination of the seven base units and the 22 coherent derived units with unique names and symbols.The SI offers twenty-four prefixes that, when applied to the name and symbol of a coherent unit or units, produce twenty-four additional (non-coherent) SI units for the same quantity since the sizes of coherent units will be convenient for some purposes but not for others.The coherent unit's decimal multiples and submultiples are always the non-coherent units.The SI is designed to be a dynamic system; new units and prefixes are added, and unit definitions are changed through international agreement as measurement technology develops and measurement accuracy rises.To learn more about SI units refer to
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Density is a physical property that relates the mass of a substance to its volume.
Calculate the density, in g/mL, of a liquid that has a mass of 0.125 g and a volume of 0.000225 L.
density:
Calculate the volume in milliliters of a 4.91-g sample of a solid with a density of 3.41 g/mL.
volume:
Calculate the mass of a 0.267-mL sample of a liquid with a density of 0.660 g/mL.
mass:
answer:
3004838
Explanation:
3+939$
science
describe the sexual reproductive of flowering plants like the gumamela flower by
creating your own story
Answer:
the organs of sexual reproduction is the flower. male gametes is found in pollen grains and produced in the anthers of the flower. female gametes i found in ovules and produced inthe ovary of the flower.
when chlorine is added to water, a dissociation occurs. when we add cl2 (chlorine) h2o (water), we get a reaction which leaves us with hocl (hypochlorous acid) hcl (hydrochloric acid). how much of each is created is dependent on water temperature, and especially on water ph. hypochlorous acid is the active, killing form of chlorine. this is what does the real sanitizing work in your pool water. the chlorine molecule or ion kills microorganisms by slashing through the cell walls and destroying the inner enzymes, structures and processes. when this occurs, the cell has been deactivated, or oxidized. the hypochlorous molecule continues this slash
Chlorine reacts reversibly with water to give a mixture of hypochlorous acid and hydrochloric acid.
Cl2+H2O⇔HOCl+HCl
Because of this reaction, it is able to act as a disinfectant for water sterilization.
What is sterilization?
Sterilization is a process that removes, kills, or inactivates all life forms (especially microorganisms such as fungi, bacteria, spores, and unicellular eukaryotic organisms) and other biological agents, such as prions, present in or on a particular surface, object, or fluid.Sterilization can be achieved in a variety of ways, including heat, chemicals, irradiation, high pressure, and filtration. Sterilization differs from disinfection, and pasteurization in that these methods reduce rather than eliminate all life forms and biological agents present. After sterilization, the object is referred to as sterile or aseptic.To know more about sterilization, click the link given below:
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HELP ME OUT PLEASE!!!!!!
Instead of Fossil Fuels to generate power, nuclear energy uses ___________
Oil
Coal
Uranium
Gas
Instead of Fossil Fuels to generate power, nuclear energy uses Uranium. Therefore, among all the given options, the correct option is option C.
What is Fossil Fuels?Any of a group of hydrocarbon-containing compounds of biological origin that are found in the Earth's crust and may be utilized as a source of energy are known as fossil fuels.
Coal, petroleum, oil and gas, oil shales, bitumen, tar sands, other heavy oils are examples of fossil fuels. Even before Devonian Period (419.2 to 358.9 million years ago), the majority of carbonaceous material came from algae and bacteria, but the majority of carbonaceous material that formed during and after that time came from plants. Instead of Fossil Fuels to generate power, nuclear energy uses Uranium.
Therefore, among all the given options, the correct option is option C.
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When using gloves as personal protective equipment, which of the following procedures should be followed? A: Wear gloves of a material known to be resistant to permeation by the substances in use B: Remove gloves before handling objects such as doorknobs, telephones, pens, and computer keyboards C: Decontaminate or wash gloves before removing them D: Inspect gloves for small holes or tears before use E: Replace gloves periodically, depending on the frequency of use F: All of the above 13. Latex gloves A: May be reused as long as they are clean B: May be reused only if they have not been permeated C: Should never be reused
F: All of the above. When using gloves as personal protective equipment, it is important to follow all of the procedures listed:
A) Wear gloves of a material known to be resistant to permeation by the substances in use,
B) Remove gloves before handling objects such as doorknobs, telephones, pens, and computer keyboards,
C) Decontaminate or wash gloves before removing them,
D) Inspect gloves for small holes or tears before use,
E) Replace gloves periodically, depending on the frequency of use.C: Should never be reused. Latex gloves should never be reused as they may have been contaminated and may not provide sufficient protection. It is recommended that gloves are changed frequently to ensure safety.
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You are making a fluorescence measurement at a concentration of 500 pM and get a signal to noise of 5. If you need a detection limit of 75 pM, by how much do you need to increase the source power? Assume all you noise is from the instrument so you can use the 3 x standard deviation definition.
By -320 pM, we need to increase the source power. A fluorescent material begins to produce visible light when energy is absorbed as a result of the incidence of X-rays, light waves, and electrons.
What is fluorescence?When a substance generates electromagnetic waves inside the longer wavelength range and makes them visible to the human eye, it is a fascinating occurrence. Let's first define fluorescence in order to comprehend this. This allows the substance to gently transition from the partly excited state to the ground state. Fluorescence is the term for this phenomena.
Detection limit = 3 × noise / signal to noise ratio
Detection limit = 3× 75 pM / 5 = 15 pM
Source power = (noise / desired detection limit)² × current source power
Source power = (15 pM / 75 pM)² ×500 pM
= 0.36 ×500 pM
= 180 pM
Source power= 180 pM - 500 pM =
=-320 pM
Therefore, -320 pM, we need to increase the source power.
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Which of the following descriptions and/or equations best represents the enthalpy change of a system? There may be more than one correct answer.
A. The heat absorbed or released during a phase change or chemical reaction at constant pressure
B. The work done on or by a phase change or chemical reaction at constant pressure
C. deltaH = deltaE + PdeltaV
D. deltaE = q + w
E. H= E + PV
The heat absorbed or released during a phase shift or chemical reaction at constant pressure is what option a, in terms of equations, best describes the enthalpy change of a system.
Is the heat change in a system described by enthalpy?At constant pressure, a system's enthalpy (H) represents its heat capacity. Chemists often gauge how reactants transform into products by measuring changes in the enthalpy of chemical systems. The same thing as the enthalpy change, which is denoted by the symbol H, is the heat that a process at constant pressure absorbs or releases.A chemical reaction causes a change in the system's enthalpy, which is determined by the volume of the system's gas, its pressure, and its internal energy.The heat absorbed or released during a phase shift or chemical reaction at constant pressure is what option a, in terms of equations, best describes the enthalpy change of a system.To learn more about enthalpy change refer to:
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Which of the following are square properties? Choose ALL that apply.
Four right angles.
Exactly one pair of parallel sides.
Diagonals are perpendicular.
Diagonals are congruent.
The properties of a square are;
Four right angles.Diagonals are perpendicular.Diagonals are congruent.What is a square?We know that a square is one of the types of the quadrilaterals that we have in mathematics. The implication of this is that the square would have four sides.
If the square has four sides then it is possible that we can be able to draw a diagonal that would run from one point to the other across the square and this can be said for all the quadrilaterals. This is how now know the square.
Hence, the square can be said to be a quadrilateral figure.
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which of the following compounds is a gas at room temperature? ch3ch2och2ch3 ch3ch2ch2ch2ch2ch3 h2o ch4
[tex]ch3ch3ch3[/tex] is the one compounds is a gas at room temperature.
What is the ideal room temperature?
Generally speaking, room temperature refers to a range of air temperatures that people favour indoors. When someone is dressed in regular indoor attire, they feel at ease. Depending on humidity, air circulation, and other factors, human comfort can go beyond this range.
Around 20°C, or 68° Fahrenheit, is usually the standard room temperature. Though it's crucial to keep in mind that different rooms will need to be heated to different temperatures, this is a good ambient temperature to aim for.
Store at 15°-25°C (59°-77°F) above room temperature. Ambient temperature: Keep your items at the temperature outside. Considering the vast range of ambient temperatures, this word is not commonly used.
Molecules with the stronger intermolecular forces are pulled tightly together to form solid at higher temperatures and that's why the freezing point is higher.
Also, molecules with the stronger intermolecular force have greater interaction between the molecules and thus on heating do not boil easily and have high boiling point also.
Thus, melting point and boiling point increases with increase in number of carbon atoms and also increase in intermolecular forces (like hydrogen bonding, if present).
Thus, the compound which is gas at room temperature is because it has least number of carbon atoms and absence of hydrogen bonding.
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Which atomic models in task 1 are not supported by Thomson’s experimental evidence? For each of these models, explain the experimental results that the model would predict.
The atomic models in task 1 that are not supported by Thomson’s experimental evidence are Dalton's atomic model and Rutherford model.
Why are they not supported by Thomson’s experimental evidence?Dalton's atomic model proposed that atoms were indivisible and indestructible, and that atoms of different elements had different weights and properties. But Thomson's experiment, which found that atoms are divisible and can be split into smaller particles called electrons, disproved this model.
Also, Rutherford's atomic model proposed that atoms were made up of a dense central nucleus of protons and neutrons, surrounded by a cloud of electrons. But Thomson's experiment, which found that electrons are spread evenly throughout the atom and not concentrated in a central nucleus, disproved this model.
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Define hydrogen bonding with example?
Explanation:
Hydrogen bonding is a type of noncovalent interaction between molecules or within a molecule in which a hydrogen atom is attracted to a highly electronegative atom, such as nitrogen, oxygen, or fluorine. The bond is formed between the partial positive charge on the hydrogen atom and the partial negative charge on the other atom.
An example of hydrogen bonding is the interaction between the hydrogen atoms in the molecule of water, H2O. In the water molecule, each hydrogen atom is bonded to an oxygen atom. The oxygen atom is more electronegative than hydrogen, which means it has a stronger pull on the electrons in the bond. This creates a partial negative charge on the oxygen atom, and a partial positive charge on the hydrogen atoms. These partial charges allow for the formation of hydrogen bonds between the hydrogen atoms of one water molecule and the oxygen atoms of another water molecule. This is what gives water its unique properties, such as high boiling point, high surface tension, and high heat of vaporization.
Name two substances that when reacted together, will produce the soluble salt, sodium nitrate
Answer:
Sodium nitrate can be produced by reacting sodium hydroxide (NaOH) and nitric acid (HNO3) together.
Explanation:
Sodium nitrate is produced by the reaction between sodium chloride (NaCl) and nitric acid (HNO3). The chemical equation for this reaction is:
NaCl + HNO3 → NaNO3 + HCl
In this reaction, sodium chloride (table salt) and nitric acid react to form the soluble salt, sodium nitrate and hydrogen chloride as a byproduct. The reaction is exothermic and generates heat.
Silver nitrate and sodium chloride are both soluble
What is the volume, in milliliters, of 6.48 g
of acetone?
Answer:Good question!! I’ll try to help you the best I can!
First off, you have to know that acetone has a density of 0.7857 g/cm^2
You also need to know that 1mL = 1cm^3
Once you know that, the rest is pretty easy you’ll see! The next step is a cross product to find out how many cm^2 are in 6.72g :
0.7857 g → 1 cm^3
6.72 g cm^3
(1 * 6.72) ÷ 0.7857 = x
6.72 ÷ 0.7857 =x
8.55
Which means that for 6.72g of acetone, you have a volume of about 8.55cm^3.
Finally, since we’ve established in the beginning that 1cm³ = 1mL, it’s easy to answer your question!
The volume, in millilitres, of 6.72g of acetone is about : 8.55mL
There you go, I really hope this helped, if there’s anything just let me know!
Explanation:
the graph shows all of the stable isotopes of elements according to the numbers of protons and neutrons in their nuclei. a graph titled zone of nuclear stability with number of protons from 0 to 80 on the x-axis with number of neutrons on the y-axis from 0 to 140. there are two lines, one with a slope of 1 from (0, 0). the other line has points of (20, 24), (40, 52) and (60, 120) labeled stability zone. which statements are supported by the graph? check all that apply.
1. For large atoms, more neutrons than
2. protons are needed to be stable.
Nuclei that have 90 or greater protons are always radioactive.
Isotopes are two or more types of atoms that have the same atomic number and place in the periodic table but differ in nucleon numbers because their nuclei contain differing quantities of neutrons. The atomic number of an element on the Periodic Table is determined by the number of protons in its nucleus. Carbon, for example, contains six protons and has atomic number 6.
Isotopes have chemical characteristics that are same but have drastically distinct nuclear properties. For example, hydrogen has three isotopes. Isotopes are used to define human illness, identify illegal drugs at international borders, sterilise medical equipment, and power space exploration batteries. Isotopes are also used in agriculture, astronomy, biology, chemistry, materials science, medicine, and nuclear safety studies.
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when aqueous naoh is added to a solution containing al3 , a solid forms, but as more naoh solution is added the solid dissolves. which of the following best describes why the solid dissolves?
A solid that appears when aqueous naoh is added to an al3-containing solution; however, the solid dissolves as more naoh solution is added. due to the amphoteric nature of aluminium.
which allows it to react with both bases and acids. Aluminium ions are eager to accept two electrons because of how acidic they are. The chemical element aluminium, also known as aluminium in American and Canadian English, has an atomic number of 13 and the symbol Al. Aluminium is less dense than most common metals, with a density around one third that of steel. an electric charge Having a negative charge, an electron is a particle. The negative charge is 1.602 10-19 coulomb in magnitude. A proton's mass is 1/1837 that of an electron.
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A prescription medication requires 8.00 mg per kg of body weight. Express your answer to three significant figures.
The amount of medication required in grams per pound of body weight is 0.00363 g/lb.
What is the conversion factor between pounds and kilograms?The conversion factor between pounds and kilograms is given below:
1 kg = 2.20462 lb
The data given is as follows:
The prescription medication requirement = 8.00 mg/kg
We use the conversion factor to convert the given amount to grams per pound of body weight.
1 kg = 2.20462 lb
1 g = 1000 mg
Hence;
8.00 mg = 8.00 * 1 g/1000 mg
8.00 mg = 0.008 g
The given amount of medication required in grams per pound of body weight = 0.008 g / 2.20462 lb
medication required in grams per pound of body weight = 0.00363 g/lb
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Complete question:
A prescription medication requires 5.98 mg per kg of body weight. Convert this quantity to the number of grams required per pound of body weight. Express your answer to three significant figures.
CAN SOMEONE HELP WITH THIS QUESTION?✨
The volume of a piece of copper with a weight of 48.218g is 5.45mL.
How to calculate volume using the graph?A graph is a data chart (graphical representation of data) intended to illustrate the relationship between a set (or sets) of numbers (quantities, measurements or indicative numbers).
According to this question, a graph is shown above with mass (g) on the y axis and volume (mL) on the x axis.
Based on the data provided in the graph, the following expression was given:
y = 8.8521x
y represents the mass while x represents the volume
48.218g = 8.8521x
x = 48.218 ÷ 8.8521
x = 5.45mL
Therefore, 5.45mL is the volume at that weight.
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e) suppose you choose the initial masses so that both reactions produce pcl 3. explain how both of these chemical reactions obey the law of definite proportions, even though they produce different numbers of moles of the product. justify your answer with calculations.
The law of definite proportions states that regardless of the amount of reactants used, a chemical reaction will always produce the same proportion of products. In this case, both reactions will produce the same mole ratio of PCL3 (1:1) even though they produce different numbers of moles of the product. To demonstrate this, let's take a look at the first reaction:
Reaction 1:
2HCl + Ca3(PO4)2 → 2CaCl2 + PCl3
2 moles of HCl + 1 mole of Ca3(PO4)2 → 2 moles of CaCl2 + 1 mole of PCl3
Therefore, the mole ratio of PCL3 is 1:1.
Now let's look at the second reaction:
Reaction 2:
HCl + P4O10 → PCl3 + H3PO4
1 mole of HCl + 2 moles of P4O10 → 1 mole of PCl3 + 2 moles of H3PO4
Once again, the mole ratio of PCL3 is still 1:1. Therefore, both of these chemical reactions obey the law of definite proportions.
What is definite proportions?
Definite proportions law states that a given compound always contains the same elements in the same proportions by mass. This law, also known as the law of constant composition.
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18. If 25.0 grams of ice at 0°C are heated at a constant rate of 400.0 joules/minute, calculate the time needed to
melt the sample completely. SHOW WORK.
I need help with this as well
It takes 8,350 joules of heat, or 2,000 calories, to melt 25 grams of ice.
How much heat is required to melt 25.0 g of ice at 0 C?The heat of fusion is the quantity of heat energy needed to convert a substance from a solid to a liquid state of matter. As the enthalpy of fusion, it has another name. Typically, it measures energy in joules per gram (J/g) or calories per gram (Cal/g). Calculating the amount of energy needed to melt a sample of water ice is shown how to do in this example problem.Examples:
To melt 25 grammes of ice, how much heat, in Joules, is needed? The heat in calories is what?
334 J/g = 80 calories per gramme of food containing water.
Solution
Heat of fusion is specified in the problem. Not off the top of your head knowledge, this is not a number. Common values for the heat of fusion are listed in chemistry tables.
You will need the equation relating heat energy to mass and heat of fusion in order to tackle this issue:
When q = heat energy and m = mass, q = mHf.
The heat of fusion is Hf.
Since it is unaffected by a change in matter's condition, temperature is not a factor in the equation. Making sure you are using the appropriate units for the answer is crucial because the equation is quite simple.
Converting heat into Joules:
q = (25 g)x(334 J/g)
q = 8350 J
In terms of calories, it's equally simple to describe the heat:
q = m·ΔHf
q = (25g)x(80cal/g)
q = 2000 cal
Answer: It takes 8,350 joules of heat, or 2,000 calories, to melt 25 grammes of ice.
To Learn more About joules of heat Refer To:
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