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ElenaW [278]
3 years ago
7

When you balance a chemical reaction, you are making sure that the law of conservation of matter is obeyed?

Chemistry
2 answers:
Alisiya [41]3 years ago
8 0

Explanation:

A balanced chemical reaction is a reaction in which there is equal number of atoms on both reactant and product side. Also, the mass of atoms or compounds present on reactant side equals the mass of atoms or compounds present on product side.

For example, CaSO_{4} + 2HCl \rightarrow CaCl_{2} + H_{2}SO_{4}

Molar mass of CaSO_{4} = 136.14 g/mol

Molar mass of 2HCl = 2 \times 36.46 g/mol = 72.92 g/mol

Therefore, sum of molar mass of reactants = (136.14 + 72.92) g/mol

                                                                       = 209.05 g/mol

Molar mass of CaCl_{2} = 110.98 g/mol

Molar mass of H_{2}SO_{4} = 98.07 g/mol

Therefore, sum of molar mass of products = (110.98 + 98.07) g/mol

                                                                       = 209.05

Therefore, we can see that it is true that when you balance a chemical reaction, you are making sure that the law of conservation of matter is obeyed.

Kitty [74]3 years ago
6 0
<span>Answer: yes, when you balance a chemical reaction, you are making sure that the law of conservation of matter is obeyed.
</span>
<span /><span /><span>
Justification:
</span><span />

<span>1) When you balance a chemical reaction, you add the coefficients to make the number of atoms of each element in the left side of the equation (reactants) equal to number of atoms of the same elements in the right side (products).
</span><span />

<span>2) Since, each atom has a unique atomic mass associated, it results, necessarily, that the mass of the atoms of the reactants is equal to the mass of the atoms of the products</span>.
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I got 134.91 but if you round it you’ll get 135
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D = m / V


It even gives you the density of gold in the problem. Major hint. Once you know the volume (using V = m / D) then you can calculate the height (thickness) from the equation...


V = L x W x H

Volume = Length x Width x Height


start by converting 200.0 mg into grams

1000 mg = 1 g

200. mg x (1 g / 10^3 mg) = 0.200 g


V = m / D

V = 0.200 g / (19.32 g/cm^3)

V = 0.01035 cm^3


Convert 2.4 ft and 1 ft to cm

2.4 ft x (12 in / 1 ft) x (2.54 cm / 1 in) = 73.15 cm

1 ft = 30.48 cm


Compute the height (thickness)

V = LxWxH

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H = 4.64 x 10^-6 cm


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4.64 x 10^-6 cm x (1 m / 100 cm) x (10^9 nm / 1 m) = 46.4 nm


Knowing the atomic radius of gold, I might have asked my students for the minimum number of gold atoms in this thickness of gold. This would assume that the gold atoms are all in a row. This would give the minimum number of gold atoms.


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4 0
4 years ago
A phase is a part of a system with what type of composition?
TiliK225 [7]

Answer:

<u>uniform composition.</u>

Explanation:

A phase is a part of a system with uniform composition.

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