4.
What do water vapor, liquid
water, and ice have in
common?
a. The same crystal lattice structure
b. The same amount of energy
c. The same physical properties
d. The same chemical properties

Answer:

Xenon is element 54. in a perfect atom it would have 54 neutrons

Answer:

refer to explanation in order V

Explanation:

Atomic number: 54

Protons: 54

Electrons: 54

Neutrons: 77

Mass Number: 131.293 U

6 (1/2): At the upper left is the atomic number, or number of protons. In the middle is the letter symbol for the element (e.g., H). Below is the relative atomic mass, as calculated for the isotopes found naturally on Earth. At the very bottom is the name of the element (e.g., hydrogen).

6 (2/2): On the periodic table, the mass number is usually located below the element symbol.

I hope this helped!

Explanation:

decrease T = eq shifts left, because youre taking energy from the system and this is an endothermic reaction, it needs energy to make products = co2 concentration decreases

add CO = eq shifts right, because you're adding reactants in the equilibrium = i2o5 concentration decreases

increase i2o5 = same = can't affect T

decrease co2 = eq shifts right, because by

decreasing co2 you'll have less of this product than you normally have in the equilibrium, then eq will shift toward making more product = both reactants, CO and I2O5 decrease their concentration because they're being used to shift equilibrium right

Answer: they slow down

Explanation:

Just took the test

When the gas changes into a liquid the particles of a gas slow down and follows condensation hence Option (B) is correct.

Condensation is the change of the state of matter from the gas phase into the liquid phase, and is the reverse of vaporization.

The word most often refers to the water cycle.

Condensation happens one of two ways:  Either the air is cooled to its dew point or it becomes so saturated with water vapor that it cannot hold any more water. Dew Point

Therefore, When the gas changes into a liquid the particles of a gas slow down and follows condensation hence Option (B) is correct.

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The minimum volume of 4.00 M KOH required for the reaction to go to completion is 10.94 mL.

The first step is to determine the moles of aluminum foil used in the reaction. We can use the molar mass of aluminum to convert the given mass to moles:

1.1798 g Al / (26.98 g/mol Al) = 0.04375 mol Al

According to the balanced chemical equation, the reaction requires 2 moles of KOH for every mole of Al. Therefore, we need:

0.04375 mol Al x (2 mol KOH / 2 mol Al) = 0.04375 mol KOH

To calculate the minimum volume of 4.00 M KOH required, we can use the equation:

Molarity x Volume = Moles

Rearranging for volume, we get:

Volume = Moles / Molarity

Plugging in the values, we get:

Volume = 0.04375 mol KOH / 4.00 M = 0.01094 L = 10.94 mL

As a result, the minimum volume of 4.00 M KOH required to complete the reaction is 10.94 mL.

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As with most stoichiometry problems, it is necessary to work in moles. The ratio of the moles of each element will provide the ratio of the atoms of each element.

Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages).

Remeber that percentages are a ratio multiplied by 100. You must convert percentages back to their decimal value before working with them.

(.4838) (100 g) = 48.38 g C

(.0812 ) (100 g) = 8.12 g H

(.5350) (100 g) = 53.38 g O

Convert the mass of each element to moles of each element using the atomic masses.

(48.38 g C) (1 mol/ 12.10 g C) = 4.028 mol C

(8.12 g H) (1 mol/ 1.008 g H) = 8.056 mol H

(53.38 g O) (1 mol/ 16.00 g O) = 3.336 mol O

Find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles.

Use the mole ratio to write the empirical formula.

Answer:

D.  The reaction described by curve B is occurring with a catalyst.

Explanation:

The peak in the curve is the activation energy.  According to this graph, the activation energy was lowered.  A catalyst is what you can use to lower the activation energy.

The most likely accounts for the difference between curve A and curve B on the energy diagram is the reaction described by curve B is occurring with a catalyst,  therefore  option (d) is correct.

A catalyst is a chemical substance which alters the rate of a reaction without itself undergoing any permanent chemical change.

A catalyst does not initiate a chemical reaction. A catalyst does not be consumed in the reaction.

Catalysts tend to react with reactants to form intermediates and at the same time facilitate the production of the final reaction product. After the whole process, a catalyst can regenerate.

Catalysts encourage molecules to react and make the whole reaction process easier and efficient.

The most likely accounts for the difference between curve A and curve B on the energy diagram is the reaction described by curve B is occurring with a catalyst,  ,hence option (d) is correct.

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Answer:

Solar energy, wind energy, biomass energy.

Explanation:

Global warming brought on by rising carbon dioxide concentrations in the atmosphere is changing weather patterns and ocean temperatures. Changes in precipitation patterns are being brought on by the warming of the atmosphere.

Because it is one of the gases in the atmosphere that causes the greenhouse effect, which causes the Earth to warm, carbon dioxide is known as a greenhouse gas. Long-wavelength infrared radiation (heat) from the Earth is absorbed by carbon dioxide molecules in the atmosphere, and some of it is then radiated back downward.

Similarly, as air temperatures rise in response to rising carbon dioxide concentrations, more water vapor escapes into  the atmosphere—which then amplifies greenhouse heating

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Answer: This is a precipitation reaction: Zn 3(PO 4) 2 is the formed precipitate.

Explanation:

Go this Answer form, (chemequations.com)

Im Glad I helped! =)

Both the resonance structure and the formal charge of nitrous oxide are zero.

Subtract the amount of non-bonding electrons and half the number of bonded electrons from the total number of valence electrons in an atom to determine its formal charge. The nitrogen atom's formal charge in NO2 is FC=5212(6)FC=0.

Keeping track of the electrons is crucial for determining and predicting the reactivity, as is knowing the formal charge on each individual atom in a structure. When compared to an isolated neutral atom, the number of electrons that are attached to an atom in a molecule determines its formal charge.

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Answer:

3441.6 grams.

Explanation:

2 O₃ → 3 O₂

First we convert 71.7 moles of ozone (O₃) into moles of oxygen gas (O₂), using the stoichiometric coefficients of the reation:

71.7 mol O₃ * \(\frac{3molO_2}{2molO_3}\) = 107.55 mol O₂

Then we convert 107.55 moles of O₂ into grams, using the molar mass of O₂:

107.55 mol * 32 g/mol = 3441.6 g

a) To calculate the minimum frequency of electromagnetic radiation required to release electrons from the metal, you can use the following formula:

f = W / h

where f is the minimum frequency of electromagnetic radiation required, W is the work function of the metal in joules, and h is the Planck constant in joules per second.

Plugging in the values for W and h, you get:

f = (5.86 x 10^-19 J) / (6.626 x 10^-34 J/s) = 8.9 x 10^14 Hz

This is the minimum frequency of electromagnetic radiation required to release electrons from the magnesium metal.

b) To calculate the kinetic energy of the ejected electronic light of frequency 2.00 x 10^14 Hz, you can use the following formula:

KE = hf - W

where KE is the kinetic energy of the ejected electron, h is the Planck constant in joules per second, f is the frequency of the electromagnetic radiation in hertz, and W is the work function of the metal in joules.

Plugging in the values for h, f, and W, you get:

KE = (6.626 x 10^-34 J/s) * (2.00 x 10^14 Hz) - (5.86 x 10^-19 J) = 1.32 x 10^-19 J - 5.86 x 10^-19 J = -4.54 x 10^-20 J

This is the kinetic energy of the ejected electron when light of frequency 2.00 x 10^14 Hz is used to irradiate the magnesium metal. Since the kinetic energy is negative, this means that the electron is not released from the metal when irradiated with this frequency. The frequency of the electromagnetic radiation needs to be higher than the minimum frequency required to release the electron in order for the electron to be ejected from the metal.

The oxidation number of Ag in Ag2O is +1.

In Ag2O, there are two silver atoms (Ag) and one oxygen atom (O). Oxygen is known to have an oxidation number of -2 in most compounds. Since the compound is neutral, the sum of the oxidation numbers of all the atoms must equal zero.

Therefore, the oxidation numbers of the two silver atoms must add up to +2 to balance out the -2 oxidation number of the oxygen atom. Since there are two silver atoms, each silver atom must have an oxidation number of +1 to yield a total oxidation number of +2 for the compound.

In Ag2O, the silver atoms lose one electron each to form Ag+ ions. This results in an oxidation number of +1 for each silver atom. The oxygen atom gains two electrons from the silver atoms to achieve a stable octet configuration, resulting in an oxidation number of -2 for the oxygen atom. The compound Ag2O is formed through the transfer of electrons, with each silver atom exhibiting an oxidation number of +1.

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12. A monosaccharide is exactly the type of molecule shown below, which is a carbohydrate.

Carbohydrates are composed of carbon, hydrogen and oxygen in the ratio 1:2:1 in organic molecules. The simplest type of carbohydrate is a monosaccharide, which cannot be broken down further into smaller sugar molecules. They typically have three to seven carbon atoms and are composed of a single sugar molecule.

13. An amino acid is a special type of molecule that is shown in the description. The production and structure of proteins largely depend on amino acids, which are the basic components of proteins.

14. Nucleic acids are primarily used by living things to store and transmit genetic information. DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), two types of nucleic acids, carry instructions necessary for the production of proteins as well as for the operation and growth of cells.

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The no. Of moles of carbon is found to be 7.5×10⁻⁴.

No. of moles are give by = Given mass/molar mass.

Given mass is 0.009g and the molar mass of carbon atom is 12g.

So, the no. Of moles are given by ,

No. Of moles = 0.009/12

= 0.00075 = 7.5×10⁻⁴mol.

The value of 6.023 x 10²³ is equal to one mole of any substance (Avogadro number). It can be used to quantify the chemical reaction’s by-products. The symbol for the unit is mol.

Carbon element is insoluble in water, diluted acids and bases, as well as organic solvents, carbon is an inert material. It combines with oxygen at high temperatures to generate carbon monoxide or dioxide. Diamond and graphite are two distinct allotropes, crystalline forms of the carbon atom.

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The charge on the ions in an ionic compound containing cobalt(III) and fluoride ions is Co³⁺ and F⁻¹ and the formula of the compound is CoF₃.

Ionic compounds are a type of chemical compound where the oppositely-charged ions of a metal and a nonmetal are attracted to each other to form an ionic bond.

The compound formed from the bonded ions will have very different properties from the elements that make up the compound.

While atoms are neutral because they have an equal number of protons and electrons, ions have a net charge and result when an atom loses or gains electrons.

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Yes, that statement is generally correct. A scientific law is a statement that describes a phenomenon or pattern in nature, often expressed mathematically, without attempting to explain why it occurs. A scientific theory, on the other hand, is a well-substantiated explanation for a set of phenomena, based on empirical evidence and scientific reasoning.

A scientific law summarizes what happens in a particular situation, often in the form of an equation or formula, whereas a scientific theory attempts to explain why it happens.

For example, the law of gravity describes the attraction between masses, but it does not explain why this attraction occurs. In contrast, the theory of general relativity attempts to explain the underlying principles of gravity, including its effects on the curvature of space-time.

It's worth noting that both scientific laws and scientific theories are based on empirical evidence, but they serve different purposes in scientific inquiry. Laws describe what happens in a particular situation, while theories attempt to explain why it happens.

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1208.9213 not then what's the answer

The gas which is formed when a carbonate ion or salt reacts with an acid is referred to as carbon dioxide.

This is defined as the process which comprises of the combining of two or more substances known as the reactants thereby resulting in the formation of new substances which is referred to as the product.

When a carbonate ion or salt reacts with an acid, a fizzing or bubbling is observed during the reaction which signifies the presence of carbon dioxide which is the reason why it was chosen as the most appropriate choice.

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After the double replacement reaction is complete 0 grams of BaCl₂ and 31.16 grams of H₂SO₄ will remain.

First, we will write the balanced equation for the reaction

H₂SO₄ + BaCl₂  → BaSO₄ + 2HCl

This means 1 mole of BaCl₂ is needed to react completely with 1 mole of H₂SO₄ to give 1 mole of BaSO₄ and 2 moles of HCl

From the question, 50.0g of sulfuric acid is mixed with 40.0 grams of barium chloride. To determine the quantity of each substance remaining after the complete reaction, we will first determine the number of moles present in each of the reactant.

For H₂SO₄

mass = 50.0g

Molar mass = 98.079 g/mol

From the formula

Number of moles = Mass / Molar mass

∴ Number of moles of H₂SO₄ = 50.0g / 98.079 g/mol

Number of moles of H₂SO₄ = 0.5098 mol

For BaCl₂

mass = 40.0 g

Molar mass = 208.23 g/mol

∴ Number of moles of BaCl₂ = 40.0g / 208.23 g/mol

Number of moles of BaCl₂ = 0.1921 mol

Since the number of moles of H₂SO₄ is more than that of BaCl₂, then H₂SO₄ is the excess reagent and BaCl₂ is the limiting reagent (that is, it will be used up completely during the reaction)

From the equation, 1 mole of H₂SO₄ is needed to completely react with 1 mole of BaCl₂

∴ 0.1921 mol of H₂SO₄ will be needed to completely react with 0.1921 mol of BaCl₂.

Therefore, after the reaction is complete, 0 mole (i.e 0 grams) of BaCl₂ will remain and (0.5098 mole - 0.1921 mole) of H₂SO₄ will remain.

Number of moles H₂SO₄ that will remain = 0.5098 mole - 0.1921 mole = 0.3177 moles

Now, we will convert this to grams

From the formula

Mass = Number of moles × Molar mass

Mass of H₂SO₄ that will remain = 0.3177 moles × 98.079 g/mol

Mass of H₂SO₄ that will remain = 31.1597 g

Mass of H₂SO₄ that will remain ≅ 31.16 g

Hence, after the double replacement reaction is complete 0 grams of BaCl₂ and 31.16 grams of H₂SO₄ will remain.

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Answer:1=B

2=A

Explanation:

Answer:

Explanation:

These are daily things u use

Answer:

Near the Hydrogen Atoms.

Explanation:

δ+ would be found near the dipole end of the hydrogens. δ- would be found near the dipole end of oxygen.

Answer:

1. Global warming leads to increase in water temperatures which in turn cause bleaching of coral reefs, death of aquatic plants and animals thereby polluting the water body. Mother earth is crying; she says the air is polluted. Mother earth is crying, the ecosystem is collapsing and we are at the verge of extinction.

2. Earth is sad because we have started to love ourselves not to those who need it. We need to understand that earth is is no more in need of only moneymakers but in need of peacemakers,smile givers, time givers and love distributees.

3.

Answer:

1. Mother earth is crying; she says the air is polluted. Mother earth is crying, the ecosystem is collapsing and we are at the verge of extinction.

2. Earth is sad because we have started to love ourselves not to those who need it. We need to understand that earth is is no more in need of only moneymakers but in need of peacemakers,smile givers, time givers and love distributees.

3.

Stop cutting trees indiscriminately.

Plant two trees for every tree cut, water them and nurture them.

Don’t pollute water.

Avoid plastics, especially single use plastics and related products.

Don’t pollute the air by burning plastics and other waste.

Explanation:

Answer:

TiO2 = Nothing ledt

C = 7g

Ti = 5.98g

CO =3.5g

Explanation:

TiO2(s) +2C(s) → Ti(s) +CO(g)

Initial reactant masses of 10g

This is a limiting reactant problem. We have to find the limiting reactant; this is the reactant that determines the amount of product formed.

From the stoichiometry of the reaction;

1 mol of TiO2 reacts completely with 2 moles of C

Converting the starting masses to molres, we have;

Moles = mass /  molar mass

For TiO2

Moles = 10g / 79.866 g/mol = 0.125 moles

For C

Moles = 10g / 12g/mol = 0.8333 moles

Time to find the limiting reactant;

If all the 0.125 moles of TiO2 were used, it would require 2* 0.125 = 0.250 moles of C. But we have 0.833 moles of C. This means C is in excess, hence TiO2 is our limiting reactant.

All of TiO2 would be used up.

Moles left of C = 0.8333 - 0.250 moles = 0.58333

Mass left = Moles * Molar mass = 0.5833 * 12 = 6.99 = 7g

Mass of Ti and Co formed;

Moles formed is 0.125 moles .

Mass of Ti = Moles * Molar mass = 0.125 * 47.867 = 5.98 g

Mass of CO = Moles * Molar mass = 0.125 * 28 = 3.5g

Answer:

The study of chemistry is about the learning of chemist arts

Answer:Many nocturnal animals have a mirror-like layer, called the tapetum, behind the retina, which helps them make the most of small amounts of light.

Explanation:

Answer:

Below

Explanation:

Let n be the quantity of matter in the Calcium Bromide

● n = m/ M

M is the atomic weight and m is the mass

M of CaBr2 is the sum of the atomic wieght of its components (2 Bromes atoms and 1 calcium atom)

M = 40.1 + 2×79.9

● 0.422 = m/ (40.1+2×79.9)

●0.422 = m/ 199.9

● m = 0.422 × 199.9

● m = 84.35 g wich is 88.4 g approximatively

88.4 g approximatively is  the mass in grams of 0.442 moles of calcium bromide, CaBr2 ,therefore option (d) is correct.

Mass is the amount of matter that a body possesses. Mass is usually measured in grams (g) or kilograms (kg) .

To calculate mass in grams of 0.442 moles of calcium bromide, CaBr2,

Let n be the quantity of matter in the Calcium Bromide

M is the atomic weight and m is the mass

M of CaBr2 is the sum of the atomic weight of its components

Mass of  Ca = 40.1 , Mass of Br = 79.9

M = 40.1 + 2×79.9

  0.422 = m/ (40.1+2×79.9)

  0.422 = m/ 199.9

  m = 0.422 × 199.9

  m = 84.35 g which is 88.4 g approximatively .

Thus ,88.4 g approximatively is  the mass in grams of 0.442 moles of calcium bromide, CaBr2 , hence option (d) is correct .

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Paper used as a writing material is made of pulp (wood).

Paper is a sheet material used for writing on or printing on (or as a non-waterproof container), usually made by draining cellulose fibres from a suspension in water.

Paper is made from cellulose found in trees, which are the main source of cellulose fibre (or woodpulp). Besides woodpulp, paper can be made from other materials such as cotton, flax, esparto, straw, hemp, manilla and jute.

Wood pulp is usually a softwood, used for pulping to make paper.

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