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stich3 [128]
3 years ago
14

Which substance can not be decomposed by a chemical change?

Chemistry
2 answers:
Dvinal [7]3 years ago
7 0
Copper. It's copper because it is an element, not a compound substance, so its already in its basic chemical form ^u^
max2010maxim [7]3 years ago
5 0
B. Copper since the rest of the choices are compounds. Copper is an element.
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What chemical property must argon have to make it a suitable choice for light bulbs?
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3 years ago
(chem) which is more concentrated: 45.0 grams of HCOOH dissolved in 189 mL of water or 1.5 moles of CH↓2COOH dissolved in twice
Liula [17]

Answer:

CH3COOH would be more concentrated

Explanation:

The higher the concentration value, the more concentrated it is.

The relationship between concentration, moles and volume is given by the equation;

Concentration = No of moles / Volume

5.0 grams of HCOOH dissolved in 189 mL of water

Number of moles = Mass / Molar mass = 5 / 46.03 = 0.1086 mol

Concentration = 0.1086 / 0.189 = 0.5746 mol/L

1.5 moles of CH3COOH dissolved in twice as much water

Volume = 2 * 189 = 378 ml = 0.378 L

Concentration = 1.5 / 0.378 = 3.9683 mol/L

Comparing both concentration values;

CH3COOH would be more concentrated

6 0
3 years ago
Alex is 1.67 meters tall. His
nekit [7.7K]

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Explanation:

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