Answer:
1.) A vacuum chamber is a valid approach to control the experiment and prevent other variables from impacting the reaction. However, the scientist should be careful in interpreting the results since the reaction might be different in a vacuum than in air. A vacuum can affect the rate of reaction and the thermodynamics of the reaction, which might make it difficult to determine if the reaction is endothermic or exothermic.
2.) The reaction 2H2 + O2 → 2H2O is exothermic because it releases energy. When the bonds in the hydrogen molecule break, a large amount of energy is released, and when the hydrogen and oxygen molecules combine to form water, the energy released is greater than the energy required to break the bonds. This results in a net release of energy and makes the reaction exothermic.
3.) The difference in bond energies of N–N bonds in different compounds could be due to the presence of different chemical groups around the nitrogen atoms. These chemical groups can influence the bond strength between the nitrogen atoms, causing the bond energy to vary. Additionally, different bonding arrangements, such as single or double bonds, could also contribute to the difference in bond energy.
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How many atoms are in 2 H2O molecules?.
There are a total of 6 atoms in 2 H2O molecules. Each H2O molecule is made up of 2 hydrogen atoms and 1 oxygen atom, which means that 2 H2O molecules contain a total of 4 hydrogen atoms and 2 oxygen atoms. This can be calculated by multiplying the number of atoms in each molecule (2 hydrogen atoms and 1 oxygen atom) by the number of molecules (2). Therefore, 2 H2O molecules contain 2 x 2 = 4 hydrogen atoms and 2 x 1 = 2 oxygen atoms, for a total of 4 + 2 = 6 atoms.
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Describe the structure of the berilium atom
Answer:
Beryllium as 4 protons and 5 neutrons in its nucleus giving it an Atomic Number of 4 and an atomic mass of 9. An atom of Beryllium has only 2 electrons in its outer shell.
How many moles of water molecules are in 0.100 mol of copper(II) sulphate pentahydrate?
Answer:
0.500 moles of water molecules
Explanation:
The chemical formula of copper(II) sulphate pentahydrate is CuSO4·5H2O, which means that it contains 5 moles of water molecules for every 1 mole of copper(II) sulphate. To find the number of moles of water molecules in 0.100 mol of copper(II) sulphate pentahydrate, we can multiply the number of moles of copper(II) sulphate by the coefficient of water molecules:
0.100 mol x 5 moles of water/1 mole of copper(II) sulphate = 0.500 moles of water.
so there are 0.500 moles of water molecules in 0.100 mol of copper(II) sulphate pentahydrate.
How many molecules are in 1 mole?.
There are 6.022 x10²³ molecule in 1 mole.
Multiply the number of moles by the Avogadro constant to get the total number of atoms or molecules in a sample. The equation reads as follows:
number of molecule= moles x avogadro's number
An equal amount of different gases measured at the same pressure and temperature each have the same number of molecules, and one mole of material has 6.022x10²³ atoms.
Avogadro's number is a ratio that compares the physical mass of an individual to the molar mass of an atom on an atomic scale. The quantity of elementary particles (atoms, molecules, compounds, etc.) in a mole of a substance is known as Avogadro's number. Its unit is the symbol NA and its mass is 6.022x 10²³ mol⁻¹.
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Please help…. I don’t get any of this :(
Alex and Sam's bike have more chance to get rusted tan others especially Sam.
Why are aluminum bike frames used?
Aluminum is the most popular material used for bike frames and is renowned for having a high strength-to-weight ratio, being relatively light (though often not as light as carbon fiber), and being corrosion resistant. It is a well-liked option for riders and racers on a budget because it is also fairly priced.
A titanium frame doesn't need to be protected because a thin oxide coating builds on it to prevent further oxidation. A bare aluminum frame is more susceptible to oxidation and is hence more vulnerable to salt air. Steel is quickly oxidized. Paint is required to protect steel and aluminum frames from corrosion, however with time, paint deteriorates and cracks, exposing the frame.
Since bike chains are composed of steel, they require more frequent cleaning and lubrication than they would in a dry environment. Although the superior brake and shifter components are anodised, salt air will eventually penetrate the aluminum's surface treatment.
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How many grams will need to prepare a bath containing 6. 70 moles of epsom salt?
Answer:
806 grams MgSO4 (epsom salt)
Explanation:
Determine the chemical composition of epsom salt. It is magnesium sulfate: MgSO4. Determine the molar mass of epsom salt by adding the individual atomic masses of each element in the salt:
1 Mg = 24.3 AMU
1 S = 32 AMU
4 O = 64 AMU
Total = 120.36 AMU
This is also the number for molar mass, just expressed as grams/mole instead of AMU. The molar mass of MgSO4 is 120.36 grams/mole.
If we want 6.70 moles, we can multiply the molar mass by 6.70 moles:
(6.70 moles)*(120.4 grams/mole) = 806 grams MgSO4 (epsom salt)
which property of water allows it to dissolve many substances?
The property of water that allows it to dissolve many substances is its polarity.
What is polarity?
Polarity refers to the distribution of electrical charge in a molecule. A polar molecule has an uneven distribution of electrons, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end. This creates a dipole moment in the molecule.
Water molecules are polar, meaning that the electrons in the molecule are not distributed evenly, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end.
This polarity allows water molecules to form hydrogen bonds with other polar or charged molecules, such as ions and polar compounds. This type of bonding allows many substances, such as salt and sugar, to dissolve in water.
Additionally, the polarity of water molecules also allows them to interact with nonpolar substances through London Dispersion Forces, which also allows some nonpolar substances to be dissolved in water.
Hence, the polarity of water allows it to dissolve many substances.
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What is the density of a glass fragment that has a mass of 1.5g and a volume of 0.75mL?
2gcm³ is the density of a glass fragment that has a mass of 1.5g and a volume of 0.75mL.
What is density ?The term density is define as the ratio of mass and volume. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimeter.
Density = mass / volume
Given:
Density = ?
Mass = 1.5 gram
Volume = 0.75 ml
By substituting this values in give equation we get,
Density = 1.5 / 0.75
= 2 gcm³
Thus, 2 gcm³ is the density of a glass fragment that has a mass of 1.5g and a volume of 0.75mL.
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The pH of dil.Hcl is____ and the solution is_____
Answer:
pH of HCl solution is 1.52, which suggests that dilute HCl solution is very acidic in nature.
which law states that volume increases with temperature?
In accordance with Charles' Law, for a given quantity of gas under a constant pressure, the volume of the gas varies in a direct proportion to its absolute temperature.
What exactly are Boyle's Law and Charles Law?As the pressure lowers, the gas volume rises according to Boyle's Law. According to Charles' Law, as a gas's temperature rises, its volume expands.In accordance with Charles' Law, for a given quantity of gas under a constant pressure, the volume of the gas varies in a direct proportion to its absolute temperature. Utilizing the Kelvin scale, the absolute temperature is calculated.Charles' law states that when the temperature of a gas is raised while keeping the pressure constant, the volume of the gas also rises.In accordance with Charles' Law, for a given quantity of gas under a constant pressure, the volume of the gas varies in a direct proportion to its absolute temperature.To learn more about Charles' Law refer to:
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How many molecules are in 2. 0 molecules?.
Two O molecules would refer to two individual molecules of O, which stands for oxygen. Oxygen is a diatomic molecule, which means that each molecule of oxygen is made up of two atoms of oxygen (O2). So, the number of molecules in two O molecules would be two.
Two O molecules refers to two individual molecules of oxygen, which is a diatomic molecule made up of two atoms of oxygen (O2). It's a number that represents the number of molecules.
Each molecule has two atoms of oxygen. So, the number of molecules in two O molecules would be two. The statement is talking about a quantity of molecules, not a physical object or a specific set of molecules. In other words, the number 2.0 or two in this context is a representation of the quantity of oxygen molecules, not a physical object with a specific number of molecules.
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A student researches how two types of rocks are formed and records the information below.
Rock Formation
Rock 1: Formed by cooling magma
Rock 2: Formed by compacting and cementing particles together
The student claims that Rock 2 is more likely to contain a fossil than is Rock 1
Which statement BEST describes the students claim?
There wasn’t a science option :(
Answer: Based on Rock Formation, the student's judgment that Rock 2 is more likely to contain a fossil than Rock 1 is appropriate.
Explanation:
Rocks are classified into three types:
Igneous rocks, metamorphic rocks, and sedimentary rocks.
Rock 1 is an Igneous Rock.
When a fiery, molten rock crystallizes and hardens, it forms igneous rocks (from the Latin root word fire).
Rock 2 is a Sedimentary Rock
At standard surface temperatures, sedimentary rock is developed at or near the Earth's surface by the build-up and lithification of sediment (detrital rock) or by precipitation from suspension (chemical rock).
Under low temperatures and pressure, rock deposits produce sedimentary rocks in the ocean and on the Earth's crust. Plants and animals die and are deposited in a sedimentary deposit.
The following are the reasons why sedimentary rocks are the only rock types that hold fossils:
The burial of deceased plants and animals by additional sediment results in the build-up of minerals from water in bones, which leads to the development of fossils.
As a result, sedimentary rocks are the only rock types that retain fossils.
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A change in a substance that does not involve a change in the identity of the substance called
A physical change is a change in a substance that does not result in a change in the substance's identity.
A physical change is what?
A change in a substance that only affects its physical properties does not alter the substance's identity. Physical changes can involve a substance's state (such as when ice turns into liquid water), its size or shape (such as when it is cut or bent), or its density or texture (like when a solid is crushed or a liquid is whipped).A substance's chemical composition can change without affecting its physical properties.State transitions, such as a solid turning into a liquid or a liquid turning into a gas, may be involved in these modifications.Crushing a solid or whipping a liquid, which are examples of changes in density or texture,To learn more about physical change refer to:
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What are pollutant that caue acid precipitation to enter the air?
Select the following:
1. Drilling for natural ga
2. Burning coal
3. Tranporting petroleum
Burning coal cause acid precipitation to enter the air.
About Acid rainAcid rain is defined as all kinds of rain with a pH below 5.6. Rain is naturally acidic (pH slightly below 6) because carbon dioxide (CO2) in the air which dissolves with rainwater has the form a weak acid . This type of acid in rain is very useful because it helps dissolve the minerals in the soil which are needed by plants and animals.
Acid rain is caused by Sulfur which is an impurity in fossil fuels as well as nitrogen in the air which reacts with oxygen to form sulfur dioxide and nitrogen oxides. These substances diffuse into the atmosphere and react with water to form sulfuric acid and nitric acid which are easily soluble so that they fall with the rainwater. This acidic rainwater will increase the acidity of the soil and surface water which will prove harmful to fish and plant life. Efforts to overcome this are currently being intensively implemented.
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Predict the polarity of 6 real molecules (O2, HF, H2O, NH3, CF4, CH3F). First, draw the
molecules and any bond dipoles. Then draw any molecular dipoles. Explain your
reasoning before you check your predictions with the simulation.
Carbon dioxide,Ammonia,Oxygen,Water,Hydrogen fluoride,Nitrogen are the polarity of 6 real molecules
What are the molecular polarity?Polar molecules are those that possess regions of positive and negative charge. Water is an example of a polar material. The type of bonds it has, when coupled with its shape, gives one end of the molecule a slight positive charge (the hydrogen end) and the other a slight negative charge (the oxygen end).Like bonds, molecules can also be polar. In a polar molecule, electron density is unevenly distributed throughout the molecule, resulting in regions of partial negative charge and regions of partial positive charge.Whether a molecule is polar or nonpolar is a matter of its geometry. If one end of the molecule has a positive charge while the other end has a negative charge, the molecule is polar. If a charge is evenly distributed around a central atom, the molecule is nonpolar.To learn more about molecular polarity refers to:
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How many grams are in 562 dg?
Answer:
56.2 g
Explanation:
What is the value of 2 in H2O?.
Answer:
2 of hydrogen (H)
Explanation: Because it says h is for hydrogen and 2
Which of the following pH values indicates a solution with the highest concentration of hydrogen ions? A. pH = 1, B. pH = 2, C. pH = 7, D. pH = 14.
A solution with a higher number of free hydrogen ions would have lesser pH than a solution having comparatively lower number of free hydrogen ions. Thus, the answer would be Option A i.e. pH = 1.
On the pH ( denoting potential or power of hydrogen) scale , the number which has the highest concentration of hydrogen ions must generally be 0. This represents or marks a chemical/solution with a hydrogen ion concentration of 1 mole/liter or a solution of 1 M (Molarity). Such high concentrations/numbers of hydrogen ions are typically only found in solutions/mixtures made with a strong acid when completely dissociates in water (hydrochloric acid is an example of such solution). We generally treat the pH scale from zero(0) to fourteen (14). For each pH unit, the concentration of hydrogen ions or the number of free hydrogen ions decreases by an order of 10. However, for a solution of pH of less than 0 to exist, a higher hydrogen ion concentration than 1 M concentration would be required.
The lowest known pH is -3.6 from which is achieved by extremely acidic mine water.
Thus, acids generally have high concentrations of hydrogen atoms.
Hence, the answer to the question would be an option with lowest pH score, which is option A.
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Explain why your lung capacity and breathing rate are larger when you are exercising than when you are asleep
When exercising, the body requires more oxygen to fuel the muscles and produce energy. To meet this increased demand for oxygen, the lungs increase their capacity and breathing rate. This allows for more oxygen to be taken in with each breath and for the oxygen to be delivered to the muscles more quickly.
During exercise, the body's metabolism increases as the muscles need more energy to perform the exercises. As a result, the heart rate increases and the blood vessels dilate, allowing for more blood to flow through the body and deliver oxygen to the muscles. The lungs also respond to the increased demand for oxygen by increasing their capacity and breathing rate to take in more oxygen with each breath.
Additionally, the diaphragm and intercostal muscles that control the lungs' expansion and contraction also play an important role in this process. During exercise, these muscles work harder, allowing the lungs to expand more and take in more oxygen with each breath.
On the other hand, when you're asleep, the body's metabolism slows down and the muscles are at rest. So, the body doesn't need as much oxygen as it does during exercise. As a result, the lungs' capacity and breathing rate decrease, allowing for less oxygen to be taken in with each breath and for the oxygen to be delivered to the body more slowly.
In summary, when exercising the body requires more oxygen to fuel the muscles and produce energy, and the lungs increase their capacity and breathing rate to meet this increased demand for oxygen, allowing for more oxygen to be taken in with each breath and for the oxygen to be delivered to the muscles more quickly.
Usually people breathe more gradually while they are sleep, and as sleep stages progress, inhaling becomes more constant and less unpredictable. Nonetheless, studies have shown that when we are in the rapid eye movement (REM) sleep hormone, we also breathe more rapidly and unevenly.
Your lungs and cardiovascular system work quite hard while you exercise. They work together to bring oxygen into the system and get it to the working muscles. This helps your lungs work better by subsequently increases and fortifying the tissue surrounding them.
What type of elements do form ionic bonds and whyexplain why an ionic bond cannot be formed between the atoms of the same element
The ionic bonds formed in between the metals and non metals. The ionic bond is formed in between the atoms by the complete transfer of electrons.
The ionic bond is formed between the metal , which has ability to donate the electrons and the non metals , which has the tendency to accept the electron pair. The ionic bond is formed by the complete sharing of the electrons. The ionic bond cannot be formed between the atoms of the same elements because the atoms with the same electronegativity shares the electrons and form the covalent bond.
The example of the ionic bond is NaCl.
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polyatomic ions can a group of atoms have a charge ?answer key
A polyatomic ion, which is a grouping of atoms, can indeed have a charge. Monatomic ions have a charge due to an imbalance in the number of protons and electrons for the same reason.
Polyatomic ions are made up of two or more atoms that are covalently bonded, much to the structure of a neutral molecule. This cluster of covalently bonded atoms has different ratios of electrons to protons, as the name suggests. The terms "atomic ion" or "monatomic ion" can be used to refer to an ion that is made up of of one particular type of atom, with each atom having some sort of net charge, either positive or negative. the case where an ion has two or more atoms.
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How do you calculate 1 mole in grams?.
To calculate the mass of one mole in grams, you multiply the molar mass of the substance by Avogadro's number, which is 6.022 x 10²³. For example, the molar mass of water is 18.02 g/mol, so one mole of water would be 18.02 x 6.022 x 10²³= 1.080 x 10²⁴ grams.
A mole is a unit of measurement in chemistry that is used to express the amount of a substance. One mole is equal to Avogadro's number, which is 6.022 x 10²³ atoms, ions, or molecules.
To calculate the mass of one mole in grams, you multiply Avogadro's number with the molar mass of the substance in grammes per mole (g/mol). For example, the molar mass of water is 18.02 g/mol, so one mole of water would be 18.02 x 6.022 x 10²³ = 1.080 x 10²⁴ grams. This conversion factor is useful in determining the mass of a substance needed to react with another substance in a balanced chemical equation.
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The smallest subatomic particle that makes up an atom, and carries a negative charge is called
An electron is the name for the smallest subatomic particle that constitutes an atom and has a negative charge.
Where can one find electrons and what do they do?
Electrons are tiny subatomic particles with a negative electric charge. They control chemical reactions and bonds and are located outside of the atomic nucleus.An electron is a subatomic particle with a negative electric charge.It is in charge of chemical reactions and bonding and can be found outside the atomic nucleus.The building blocks of electricity, known as electrons, are present in every atom. The movement of electrons through a substance is what generates electrical current.Because electrons have a relatively low mass compared to other subatomic particles, wave-particle duality in quantum mechanics applies to them.To learn more about electron refer to:
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Which is structural isomer of 3-ethyl-3-methylhexane? 3.3 diethyloctane 2,2.3,3 tctramethylpentane 2,7-dimethyloctane 2.8-dimethylnonane
2,2,3,3-tetramethylpentane is the structural isomer of 3-ethyl-3-methyl hexane.
What is a structural isomer?
Structural isomers are isomers in which the atoms are completely different in order but have the same molecular formulas.
These are molecules with the same molecular formula but different connectivity depending on the order in which they are assembled.
The structure of Alkane (C4H10) is a simple example of a structural isomer with multiple isomers.
According to the International Union of Pure and Applied Chemistry (IUPAC), structural isomerism is also known as constitutional isomerism. It is a type of isomerism in which molecules with the same molecular formula but different orders and bonding, as opposed to stereoisomerism.
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name all monatomic and polyatomic ions
What is H2O equal to?.
Answer:
2 of hydrogen (H) and 1 oxygen (O) atom.
Explanation: The chemical formula for water is H2O, which means this molecule has 3 atoms
The number of significant figures in a value is a display of the _________ of a measurement.
A. precision
B. accuracy
C. both precision and accuracy
D. none of the above
Answer:
Number two answer is accuracy
What is the kinetic energy of a 10 kg object moving with a velocity of 2m s?.
Answer:
kinetic energy = 20jouls.
Explanation:
From the question
Mass = 10kg
velocity = 2m/s
kinetic energy = ?
kinetic energy is giving by the formula
=1/2 ×mass× velocity²
=1/2 ×10 × 2²
=5 × 4
=20j
Therefore kinetic energy = 20jouls.
describe how mike seperates the unreacted magnesium from the magnesium sulfate solution.
The method for extracting magnesium from magnesium sulphate solution described in the invention includes the following steps: decreasing stress.
How can magnesium be extracted from magnesium sulphate?The technique described by the invention includes the following steps to recover magnesium from the a magnesium sulphate solution: Calcium sulphate, which is employed as a seed crystal, is mixed with cao and/or calcium hydroxide in (A), and magnesium sulphate solution is mixed with the ca(oh)2 and/or calcium hydroxide combination in (B).
What method of separation is applied to magnesium sulphate?The most favoured method for separating the halite crystals from the magnesium sulphate crystals after milling is elutriation. This method involves pumping air into a container(19) containing a mixture very coarse halite and fairly fine magnesium.
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Is the ending substance the same substance as the blue powder? what happened to the atoms of the starting substances when the ending substances formed? be sure to explain your answers to both of these questions.
The ending product resembles the blue powder just a little bit.
What is a simple definition of a chemical reaction?
In a chemical reaction, one or more substances—also known as reactants—are changed into one or more additional substances—also known as products. Chemical elements or chemical compounds make up substances.
The result of a chemical reaction is a different substance, and the qualities of the new material are determined by how the atoms are rearranged throughout the process. When the new material is generated as a result of the reaction, the atoms of the initial substance degrade at the end. Because the elements involved in the reaction were divided, both reactants reduced amounts of the initial materials to create the new compound.
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