Which equation best represents the conservation of matter?

Answer:

1

Explanation:

x + 3 =4

subtract 3 from 4

You are left with one.

Plug in the answer

1+3=4

Answer:

2 electrons

Explanation:

Oxygen has 6 valence electrons and to be stable it needs 8. That means it needs 2 more electrons to have a full octet.

Answer:

the people injected with the drug are the variable group while the people injected with the harmless solution are the control group

Answer:

Every element in a given group has the same number of valence electrons. For elements in the main groups (1-2, and 13-18), the number of valence electrons increases when moving from left to right along any period (row). The noble gases contain a full valence electron shell, which consists of eight electrons.

Explanation:

Hope this helps.

Answer:

Valence Electrons

Explanation:

Say you are looking at a neutrally charged carbon atom, it has 6 electrons. The first electron shell can hold 2 electrons. The next can hold 8, the next can hold 8 and the next can hold ten and so on... Well in the Carbon atom case, it has 6 electrons, 6-2 is 4, so the carbon atom at 4 valence electrons, which actually helps it in making organic molecules, which in turn also helps make something you might have heard of before, organisms, the best example being, humans

Answer:

boiling

Explanation:

Answer:

The heat of fusion is the amount of energy required to change a solid into a liquid at its melting point. When a liquid becomes a solid, freezing or solidification has occurred.  The heat of vaporization is the energy required to change a liquid into a gas at its boiling point.

Explanation:

Answer:The nucleus emits particles and/or energy.

Explanation:

Answer:

Only C. is wrong else every option is correct.

Explanation:

Hope this helps you. If you want explanation then ask in comments. Good luck!

Answer:

A a chemical change

Explanation:

because a chemical change is when you mix tow substance together and they creat a new substance

Answer:

ajajbshdbrbxjdnd djxbxbx

Explanation:

hdjdndjsosnbdjdkx dkdmdbdjd

Answer:

crust .......

.........

Answer:

A

Explanation:

Another way to say Density is Density

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The  density is mass divided by volume. the correct option is option A.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water. Density is mass divided by volume.

Mathematically, density can be written as : Density = Mass of the substance÷ volume marked on the graduated cylinder. Density is directly proportional to mass and inversely proportional to volume. Density of water is 1 gram per cubic centimeter.

Therefore, density is mass divided by volume. the correct option is option A.

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A) The magnitude of the charges on CI and O atoms are : +0.16e and -0.16e  respectively

B)  Atom O will have a partial negative charge on the CIO molecule

C) Attached below

D) The formal charge on Cl is +3

A) Determine magnitude of charges on CI and O

Magnitude of charge = dipole moment / bond length --- ( 1 )

where : dipole moment = 1.24 D * [tex](\frac{3.34*10^{-30} C m}{1 D} )[/tex]

             Bond length = 1.60 A° * [tex]( \frac{10^{-10} m}{A^{0} } )[/tex]  

∴  Magnitude of charge = 2.56 * 10⁻²⁰ C

Note : Charge of an electron = 1.602 * 10⁻¹⁹ C

Therefore the magnitude of charges on CI and O atoms is

2.56 * 10⁻²⁰ C * [tex]\frac{1e}{1.602*10^{-19} }[/tex]  = 0.16 e

Therefore

charge on CI = +0.16e

charge on O = -0.16e

Hence we can conclude that A) The magnitude of the charges on CI and O atoms are : +0.16e and -0.16e  respectively and Atom O will have a partial negative charge on the CIO molecule also The formal charge on Cl is +3

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Answer:

Explanation:

The percentage error in the experimental determination is 124%.

The experimentally determined value for Ksp = 1.5×10^−10

The accepted value of Ksp = 1.2 × 10^−12

The formula for percentage error is;

% error = absolute value of ( actual value - experimental value)/actual value × 100/1

% error = absolute value of (1.2 × 10^−12 - 1.5×10^−10)/ 1.2 × 10^−12 × 100/1

% error = 124%

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Answer:

Answer should 133

Explanation:

all you have to do is add the protons and neutrons

The mass number for an atom of xenon containing 54 protons and 75 neutrons is 129 amu.

The Atomic mass of any atom may be defined as the mass of an atom that is togetherly constituted by protons and neurons in the nucleus of an atom. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number).

The mass number of Xenon is calculated by the following formula:

The Number of neutrons = Mass number - Atomic number.

where, number of neutrons = 75, and number of protons = 54.

75 = Mass number - 54 (number of protons = atomic number).

Mass number = 75 + 54 = 129 amu.

Therefore, the mass number for an atom of xenon containing 54 protons and 75 neutrons is 129 amu.

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Answer:

One of water's most significant properties is that it takes a lot of energy to heat it. Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.

Explanation:

The amount of table salt (in grams) contains this quantity of sodium is 5.844 g.

Table salt is made up of sodium and chloride. The chemical formula of table salt is NaCl. This is a common salt used daily in the kitchen. This gives us a taste of food. And it is also necessary for the body.

The RDI for sodium for adults is given that is 2300 mg. The quantity of sodium is given = 2300 mg = 2.30 g (since the answer is asked in grams)

As we know, table salt is NaCl.

The molar mass of table salt (NaCl) is 58.44 g/mol

The molar mass of sodium (Na) is 23.00 g/mol

So, for 23.00 g sodium, we need 58.44 g NaCl.

And, for 2.30 g sodium we require (58.44 g x 2.3 g) / 23 g = 5.844 g = 6 g (to one significant figure).

Therefore, the amount of sodium is present in 5.844 grams of table salt.

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Answer:

13798.18 J

Explanation:

3301 cal * 4.18 J/1 cal = 13798.18

Recall that (1 cal = 4.18 J)

The mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.

From the question,

We are to determine the mass of Hydrogen gas produced when 10.0g of sodium reacts with excess water.

From the balanced chemical equation for the reaction

2Na + 2H₂O → 2NaOH + H₂

This means

2 moles of sodium reacts with 2 moles of water to produce 2 moles of sodium hydroxide (NaOH) and 1 mole of Hydrogen gas.

Now, we will determine the number of moles of sodium present

Mass of sodium = 10.0 g

Atomic mass of sodium = 22.99 g/mol

From the formula

[tex]Number\ of\ moles\ = \frac{Mass}{Molar\ mass}[/tex]

∴ Number of moles of sodium present = [tex]\frac{10.0}{22.99}[/tex]

Number of moles of sodium present = 0.43497 mole

From the balanced chemical equation

2 moles of sodium reacts with 2 moles of water to produce 1 mole of Hydrogen gas.

Then,

0.43497 mole of sodium will react with 0.43497 mole of water to produce [tex]\frac{0.43497}{2}[/tex] mole of Hydrogen gas

[tex]\frac{0.43497}{2} = 0.217485[/tex]

∴ 0.217485 mole of Hydrogen gas was produced during the reaction

Now, for the mass of Hydrogen gas produced

Using the formula

Mass = Number of moles × Molar mass

Molar mass of H₂ = 2.016 g/mol

∴ Mass of Hydrogen gas produced = 0.217485 × 2.016

Mass of Hydrogen gas produced = 0.43845 g

Mass of Hydrogen gas produced ≅ 0.44 g

Hence, the mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.

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Answer:

A

Explanation:

it is correctly right????

Answer:

B.

The chocolate bars weigh more than 35 grams.

Answer:

hot to cold matter

Answer:

30 protons

Explanation: Each zinc isotope contains 30 protons, 30 massive, positively charged nuclear particles

30 protons, 34 neutrons, and 30 electrons.