Answer:
The chart is called the Periodic Table.
Hope this helps :)
would you expect an atom to have a charge?
Answer:
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral.
At what temperature (in °C) would a 0.00570 M solution of glucose in
water exhibit an osmotic pressure of 0.150 atm?
The temperature (in °C) that a 0.00570 M solution of glucose in water for an osmotic pressure of 0.150 atm is 522.33 C
The temperature of the glucose solution is c=0.00230 M
Osmotic pressure in the solution is 0.150 atm
Glucose is non dissociable so i=1
The osmotic pressure is as follows;
π=icrt
T=0.150/1×0.0023x0.082
T=795.33 K
T=522.33 C
The temperature of solution is 522.33 C
Osmotic pressure is defined as the minimum pressure which needs to be applied to a solution to stop the inward flow of its pure solvent across a semipermeable membrane.The osmotic pressure of a solution is proportional to the molar concentration of the particles of solute in the solution.To learn more about osmotic pressure visit:
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suppose that you and a friend see brightly colored pigeons like these at a nature park. because pigeons are usually gray and white, you both wonder where these colors came from suddenly, your friend says i have a theory these birds must get their colors from eating food that has the same colors
The correct answer is no. The explanation given by my friend is not a scientific theory, that's why it is not correct.
What is a scientific theory?A scientific theory is a well-organized explanation that frequently includes a scientific hypothesis and scientific principles to explain a collection of facts or events in the natural world.
Scientists use the word "theory" a little differently than the public, according to Jaime Tanner, a biology professor at Boston's Emerson College. Most people use the word "theory" to describe an opinion or hunch, but in science, the term relates to how we interpret the data.
A scientific theory is a phenomenon that has been observed and verified. For a declarative assertion to be elevated to the status of a theory, it must first have been tested in the form of experiments by several researchers and found to be accurate. A statement can be considered a hypothesis if it is stated on the basis of perception, with little or no experimental evidence to back it up. A theory is something entirely different.
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You have 30.33 g of limestone that decomposes by heat to give 25.53 g of solid calcium oxide and some amount of carbon dioxide gas. Predict the mass of carbon dioxide gas that must be produced.
The mass of carbon dioxide gas that must be produced is 1.6 grams.
What is carbon dioxide?Carbon dioxide is a gas that is made up of carbon and oxygen.
Given, that the mass of limestone is 30.33 g
The mass of solid calcium oxide is 25.53 g
The molar mass of 56.0774 g/MOL
The number of moles = 25.53 / 56.0774 = 0.4552 mol
The mass of carbon dioxide will be
Say you have 1 mole of CO2.
The molar mass of CO2 is the mass of 1 mole of carbon atoms, i.e. 12 grams plus the mass of 2 moles of oxygen atoms,
16 × 2 = 32 grams.
Thus, the mass of carbon dioxide is 1.6 grams.
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Which of the following is an intensive property of a sample of water?
A. Mass
B. Molar mass
C. Number of moles
D. Volume
Molar mass is an intensive property of a sample of water.
The molar mass of a certain chemical entity is its mass per unit quantity (symbol M, SI unit kgmol1). Always identify the chemical in question in accordance with the definition of the mole. A substance's molar mass is the volume of the material that contains one mole of the substance. Its basic definition is the weight of a single mole of a substance. The atomic mass of each substance is multiplied by the subscript of that element in the chemical formula to determine the molar mass.
One mole of a specific compound or material has a mass of 1 molar. We are aware that the number of moles in a compound (n) can be expressed as the ratio of the compound's given mass to its molar mass. This is measured in g mol1, the standard unit. However, the SI unit, kg mol 1, is quite uncommon. The amount of particles in 1 mole of the substance is equal to the number of atoms present in 12g of the 12C isotope.
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Determine the mass in each of the following
1) 54 molecules of CO2 (MM = 44.0 g/mol)
2) 3.65 x 1024 molecules of water (MM = 18.0 g/mol)
The mass of a substance with given number of molecules can be calculated by first finding the number of moles in the substance as follows:
No. of moles = no of molecules ÷ Avogadro's number
Moles of carbon dioxide = 54 ÷ 6.02 × 10²³ = 8.97 × 10²³ molesMoles of water = 3.65 x 10²⁴ ÷ 6.02 × 10²³ = 0.61 molesMass of these substances can be calculated by multiplying the number of moles by their molar mass as follows:
Mass of carbon dioxide = 8.97 × 10²³ moles × 44 g/mol = 3.95 × 10²⁵ grams. Mass of water = 0.61 moles × 18 g/mol = 10.98 gramsLearn more about mass at: https://brainly.com/question/21042927
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age
The correct symbol for Cl with 20 neutrons and 12 electrons is
Select one:
O a. 1737 C1³+
O b.
17³5 CI+
17³5 Cr
1737 C15+
O c.
O d.
O e. 17³5 Cl
Next page
The correct symbol for Cl with 20 neutrons and 12 electrons is 37/17 C1⁵+ (option D).
What is atomic number?Atomic number is the number of protons in an atom. The number of protons and electrons in a neutral atom is the same i.e. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral.
The charge on an atom is related to its valence electrons or oxidation state.
The overall charge of an atom is determined by the number of protons and electrons in the atom. For example; an atom with more protons will be positively charged while an atom with more electrons eill be negatively charged.
According to this question, a chlorine atom has 20 neutrons and 12 electrons. The proton number of chlorine is 17.
This means that the mass number of chlorine is 20 + 17 = 37 and the charge is 17 - 15 = 2+.
Therefore, the correct symbol for Cl with 20 neutrons and 12 electrons is 37/17 C1⁵+.
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Explain the relationship between heat and thermal energy.
Answer:
Thermal energy gives the total kinetic energy the system possesses. It is used to determine the internal energy of a system.
Heat is the flow of thermal energy between two objects of different temperature.
Explanation:
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Which of the following structures can differentiate between plant and animal cells
An atom of an element contains 20 protons and 21 neutrons. Which of these is true of the element?
it is a noble gas
it is a transition element
it is a nonmetal
it is an alkaline earth metal
Answer:
It is an Alkaline earth metal
Explanation:
20 protons meaning the element is 20 on the periodic table-Calcium.
The number of neutrons does not matter
Calcium is not a noble gas, transition metal, and nonmetal.
Calcium is in the 2nd group meaning it is an alkaline earth metal.
Which layer of the Earth has plasticity?
Answer:
The mantle is the thickest layer of Earth, making up about 85% of Earth's volume. The lower mantle is pretty solid stuff, while the upper mantle moves around like silly putty. This movement of rock without breaking is called plasticity, and the liquid part of the mantle is referred to as the asthenosphere.
Explanation:
upper mantle
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The layer of the Earth that has plasticity is the asthenosphere, located in the upper part of the mantle.
The asthenosphere is the upper mantle underneath the lithosphere. Its partially molten, ductile nature gives it flexibility.
High temperatures and pressure make the asthenosphere plastic. Under extreme heat and pressure, these rocks distort and flow slowly over time. The asthenosphere's plasticity lets Earth's tectonic plates move.
Unlike the asthenosphere, the lithosphere—the crust and part of the topmost mantle—is hard and brittle. Tectonic plates interact and migrate over the asthenosphere.
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Please explain and answer
To have only two significant figures we must have to add a decimal point and two zeros.
What are significant figures?The term significant figures refers to the figures that we could assign a place value. These are the figures that could be assigned a place in a string of digits. The nonzero values to which it is possible that we could give a place can be called a significant figure.
Having established that, we can see that the number 52 has two significant figures. The number 5.209 has three significant figures. If we want the value 52 to retain having only two significant figures then we have to add a decimal point and two zeros.
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A patient is in the dental office to begin a preparation for veneers on teeth #6,#7,#8,#9, and #10. the dental assistant has set up the operatory for the procedure and has all the correct armamentarium ready to start the preparation. After reviewing the patients medical history, the dental assistant notices that the patient has had four heart surgeries. what changes should be made in the setup of this procedure and why
The changes which should be made in the setup of this procedure is the reduced lacing of the gingival retraction cords with racemic epinephrine.
Who is a Dentist?These are healthcare professionals who are trained and specialize in the care of the oral health of individuals.
In the Veneer preparations , a dental impression which has to be made which is the reason why gingival retraction cords with racemic epinephrine has to be used for effective results. Ina scenario where the patient has had four heart surgeries the the epinephrine should be reduced or other options used because it could increase heart pressure and lead to complications.
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an ant eater can eat 6.9 pounds of ants in a day. if each ant has a mass of 82 mg how many ants do they eat in one day??
The number of ants the anteater can eat in a day is 39123 ants.
What is the number of ants the anteater can eat in a day?The number of ants the anteater can eat in a day is calculated as follows:
mass of ants the anteater can eat in day = 6.9 lb
mass of ants the anteater can eat in day in g = 6.9 lb* 453.6 g/1 lb
mass of ants the anteater can eat in day in g = 3129.84 g
mass of one ant in g = 80/1000 = 0.08 g
number of ants the anteater can eat in a day = 3129.84 g/0.08 g
number of ants the anteater can eat in a day = 39123
In conclusion, the number of ants the anteater can eat in a day is obtained from the ratio of the mass of ants eaten by the anteater in a day and the mass of one ant.
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What mass in grams of tin would be required to completely react with
1.50 L of 0.750 M HBr in the following chemical reaction?
Sn(s) + 4 HBr(aq) - SnBr (aq) + 2 H₂ (g)
Mass in grams of tin would be required to completely react with 1.50 L of 0.750 M HBr in the following chemical reaction is 36.19g
Mass in gram is the amount of that compound that has the same mass in grams as the formula mass in atomic mass unit
Here given reaction is
Sn + 4HBr → SnBr + 2H₂
Mole of HBr = 1.50L × 0.750 M
= 1.125 mol
From balanced equation 4 mole of HBr react completely with one mole of tin to form the said product
Therefore, 1.125mole of HBr react completely with 1/4×1.125= 0.2812 mole of tin to form the said product
Molar mass of ton is 118.71g/mol
Mass of tin required = 0.2812×118.71
36.19g
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What conditions would be predicted based on the information in the weather map? A. The advancing mass of cold air creates a low pressure area. B. The cold front advances without bringing any change in the weather. C. The high pressure causes cold air to move toward the low pressure areas. D. The cold front advances from an area of high temperature to an area of low pressure.
Answer:
Explanation:
The high pressure causes cold air to move toward the low pressure areas
So c
Help me out with this chem problem please
Answer:
6.36 x 10²⁰ atoms
Explanation:
To find the number of atoms in the P₂O₅ sample, you need to (1) convert grams to moles (using the molar mass of P₂O₅) and then (2) convert moles to atoms (using Avogadro's number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given value (0.150 g = 3 sig figs).
Atomic Mass (P) = 30.97 g/mol
Atomic Mass (O) = 16.00 g/mol
Molar Mass (P₂O₅): 2(30.97 g/mol) + 5(16.00 g/mol)
Molar Mass (P₂O₅): 141.94 g/mol
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
0.150 g P₂O₅ 1 mole 6.022 x 10²³ atoms
----------------------- x ---------------- x ------------------------------- = 6.36 x 10²⁰ atoms
141.94 g 1 mole
What is the electron configuration for 1s22s22p63s2
Answer:
its atomic no is 12
Explanation:
name = MAGNESIUM
4. The following precipitation reaction can be used to determine the amount of copper ions dissolved in solution.
A chemist added 5.00 × 10−2 L of a solution containing 0.173 mol L−1 Na3PO4(aq) to a 5.00 × 10−2 L sample containing CuCl2(aq). This resulted in a precipitate. The chemist filtered, dried, and weighed the precipitate. If 1.21 g of Cu3(PO4)2(s) were obtained, and assuming no copper ions remained in solution, calculate the following:
a. the concentration of Cu2+(aq) ions in the sample solution.
b. the concentrations of Na+(aq), Cl−(aq), and PO43−(aq) in the reaction solution (supernatant) after the precipitate was removed.
a) In the sample solution, concentration of Cu^2+ ions = 0.191 mol L-1
b) Concentration of Na+ = 0.0865 mol L-1
Concentration of Cl- = 0.1908 mol L-1
Concentraion of PO42- = 0.0199 mol L-1
Reaction of Na3PO4 and CuCl2 gives 1.21 g of Cu3(PO4)2 as a precipitate. But after precipitation, no Cu2+ ions are left which means, the number of moles of Cu2+ present will be 3 × 3.18 mmol = 9.54 mmol ( same for CuCl2 as it contains only 1 Cu+ ion) ( From the formula 1 mole of Cu3(PO4)2 will give 3 moles of Cu2+ ions). the concentration of Cu2+ ions in the sample will be 9.54 × 10^-3/ 5.00 ×10^-2 = 0.191molL-1Now in the final mixture, we have 0.1 L of solvent. ( 5.00 ×10^-2 + 5.00 ×10^-2 ).Number of moles of Na+ = Volume × Molarity = 5.00 × 10^-2 L ×0.173 mol L-1 = 8.65 mmol ( As it is not present in the precipitate, we have to take the initial number of moles)Concentration of Na+ = 8.65 × 10^-3/ 0.1 == 0.0865molL-1Number of moles of Cl - = 2 × 9.54 = 19.08 mmol ( From the formula one mole of CuCl2 gives 2 moles of Cl- )Concentration of Cl- = 19.08× 10^-3 0.1 = 0.1908molL-1 Number of moles of PO42- = Number of moles in Na3PO4 - Number of moles in the precipitate = 8.35 - 2 ×3.18 = 1.99 mmol ( In Na3PO4 there is only one PO42- whereas in the Cu3(PO4)2 there are 2 PO42-Concentration of PO42- = 1.99× 10-³ / 0.1= 0.0199molL-1To know more about Concentration visit : https://brainly.com/question/17639158
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a 175 lb patient is to under go surgery and will be given an anesthetic intravenously. The safe dosage is 12 mg/kg of body weight. Determine the maximum dose of anesthetic that should be used
Taking into account the rule of three, the maximum dose of anesthetic that should be used is 952.5444 mg.
Rule of threeThe rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, the direct rule of three must be applied using the following formula, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x=(c×b)÷a
Maximum dose of anesthetic
In this case, you know:
Body weight= 175 lb= 79.3787 kg (being 1 lb= 0.453592 kg)Safe dosage= 12 mg/kg of body weightYou can apply the following rule of three: if for 1 kg of body weight 12 mg should be supplied, for 79.3787 kg of body weight, how much anesthetic should be supplied?
1 kg ⇒ 12 mg
79.3787 kg ⇒ x
So: x=(79.3787 kg× 12 mg)÷ 1 kg
Solving:
x= 952.5444 mg
In summary, the maximum dose of anesthetic that should be used is 952.5444 mg.
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this model represents an atom and it parts. label the parts of an atom
Answer:
Pls attach the picture for labelling.
Generally parts of an atom are:
1) Protons (+)
2) Neutrons (neutral)
Protons and neutrons are present in the nucleus
3) Electrons (-)
What is Conduction & Convection?
Answer:
Explanation:
conduction:he process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
convection:movement in a gas or liquid in which the warmer parts move up and the cooler parts move down
Pls help its urgent?What is the relationship between KMT and Sea Level Rise?
CER format
3-4 sentences
The relationship between KMT and sea level rise is 760 nm as the sea level rises because the gas level is increasing.
KMT is described as the behavior of gases and also it is used to explain the macroscopic properties of a gas such as pressure and temperature.
Sea level rise is an increase in the level of the world oceans due to the effects of global warming and burning fossil fuels is one of the causes of global warming because it releases carbon dioxide and other heat-trapped gasses into the atmosphere.
So, the relationship between kinetic molecular theory (KMT) and sea level rise is the distance between sea level and KMT which is 760nm as the sea level is rising because the gas level is increasing.
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How many oxygen atoms are in 4.00 g of quartz?
Answer:
Rounding for significant figures gives us a final answer of 3.41×1022 atoms 3.41 × 10 22 a t o m s atoms of oxygen.
7. Apply Scientific Reasoning
Hooke
and Van Leeuwenhoek made their discoveries
around the same time. More than 150 years
later, Schleiden, Schwann, and Virchow all
made breakthroughs within a few years of each
other. What are some possible reasons for the
sudden development of the cell theory after
such a long break?
The 150-year gap in the scientific discovery could be because many individuals believed the theory of spontaneous generation.
What is the theory of spontaneous generation?The theory of Spontaneous generation is a superseded scientific theory that held that living creatures could arise from nonliving matter and that such processes were commonplace and regular.
The theory of Spontaneous generation is incorrect and also obsolete. This theory was formulated by Aristotle.
The theory of Spontaneous generation aims to explain the seemingly sudden emergence of organisms such as rats, flies and maggots within rotting meat and other decomposable items by suggesting that organisms do not descend from other organisms or from a parent, and that only require that certain conditions in their environment be fulfilled in order for creation to occur.
Many scientist disapproved the theory of Spontaneous generation and made studies and experiments to that effect. Such scientist's includes persons like Francesco Redi, John Needham, Lazzaro Spallanzani and many more people.
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if atom contain types of alpha heavy particle ,how can the two positive alpha particle penetrate the atom?
The alpha particle can penetrate through small distances and up to a certain range and penetrate the materials.
The alpha particles are mainly used (in very small amounts) in materials such as smoke detectors. Also, alpha particles have a very less ability to penetrate other materials. In other words, these particles of ionizing radiation can be blocked by a sheet of paper, skin, or even a few inches of air.They are relatively heavy, and only travel about an inch in air. Alpha particles can easily be protected by a single sheet of paper and cannot penetrate the outer dead layer of skin, so they pose no danger when their source is outside the human body.
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Which of these is a way to tell if something is a compound?
Answer:
Answer: Image 3 is a compound.
Explanation: A compound is something that consists of two or more different elements bonded chemically.
A molecule is formed when two or more elements combine chemically.
An element is described as something which cannot be broken down by any chemical means.
We are given 4 images.
Image 1 is an element as it is showing the shell structure of Oxygen (O) element.
Image 2 is an element as only 1 element is known that is Magnesium (Mg).
Image 3 is a compound as in the structure 2 elements are shown which is bonded together. Elements present in this are Carbon (C) and Oxygen (O).
Image 4 is a molecule as in the structure 2 H-atoms combine chemically, but it cannot be considered as compound as the two elements are not different.
Explanation:
For the reaction
Ti(s)+2F2(g)→TiF4(s)
compute the theoretical yield of the product (in grams) for each of the following initial amounts of reactants.
1. 4.0 g Ti , 4.0 g F2
2. 2.2 g Ti , 1.8 g F2
3. 0.225 g Ti , 0.283 g F2
The theoretical yields in each case are;
1) 13.64 g
2) 5.82 g
3) 0.92 g
What is the theoretical yield ?We know that the stoichiometry of the reaction is the tool that we could use to obtain the parameters that has to do with a given reaction. We have the reaction; [tex]Ti(s)+2F_{2}(g)------- > TiF_{4} (s)[/tex]
1) Number of moles of Ti = 4.0 g/48 g/mol = 0.08 moles
Number of moles of [tex]F_{2}[/tex] = 4.0 g/38 g/mol = 0.11 moles
If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]
0.08 moles reacts with 0.08 moles * 2 moles/1 mole
= 0.16 moles
[tex]F_{2}[/tex] is the limiting reactant
Mass of [tex]TiF_{4}[/tex]= 0.11 moles * 124 g/mol = 13.64 g
2) Number of moles of Ti = 2.2 g /48 g/mol = 0.045 moles
Number of moles of [tex]F_{2}[/tex]= 1.8 g/38 g/mol = 0.047 moles
If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]
0.045 moles of Ti reacts with 0.045 moles * 2 moles/1 mole
= 0.09 moles
[tex]F_{2}[/tex] is the limiting reactant
Mass of TiF4 = 0.047 moles * 124 g/mol = 5.82 g
3) Number of moles of Ti = 0.225 g/48 g/mol = 0.0047 moles
Number of moles of [tex]F_{2}[/tex] = 0.283 g/38 g/mol = 0.0074 moles
If 1 mole of Ti reacts with 2 moles of [tex]F_{2}[/tex]
0.0047 moles of Ti reacts with 0.0047 moles * 2 moles/1 mole
=0.0094 moles
[tex]F_{2}[/tex] is the limiting reactant
Mass of [tex]TiF_{4}[/tex]= 0.0074 moles * 124 g/mol = 0.92 g
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A chemist determines by measurements that 0.065 moles of nitrogen gas participate in a chemical reaction. Calculate the mass of nitrogen
gas that participates.
Round your answer to 2 significant digits.
X
5
The mass of nitrogen gas that participates is 0.00464.
What is mass?
"Mass is the quantity of matter of a physical body." The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
The formula to calculate the mass
mass = moles / molar mass
Given, that the moles of nitrogen gas are 0.065 moles
The molar mass of nitrogen is 14
The mass of nitrogen is to be calculated.
Putting the values in the formula
0.065 / 14 = 0.00464
Therefore, the mass of nitrogen gas is 0.00464.
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12.24 cm (wavelength of a microwave oven)
The question is incomplete, however, 0.245 x 10^10 s^ -1 is the frequency of 12.24 cm (wavelength of a microwave oven).
we have given, λ= 12.24 cm, in the statement,
ν = c / λ where c is the velocity of light , i.e 3 x 10^10 cm/s
So, putting the value of c and λ= 12.24 cm,
we get,
ν = 3x 10^10 cm s^-1 / 12.24 cm
= 0.245 x 10^10 s^-1
Frequency is the quantity of full oscillations generated by a wave particle in a unit of time.When a wave travels from one place to another, its frequency describes how frequently a medium particle vibrates. The frequency of a wave may be calculated mathematically by counting how many full oscillations are produced during its propagation in one unit of time. The number of waves passing a given location in a unit of time may thus be used to characterize it.To know more about frequency visit : https://brainly.com/question/14316711
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