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dimulka [17.4K]
3 years ago
12

What is an example of a physical change involving iron and a chemical change involving iron?

Chemistry
2 answers:
Vikentia [17]3 years ago
6 0
Chemical change: is any change the results formation of new chemical substances Physical changes: rearranged molecules but affect internal structures
Sunny_sXe [5.5K]3 years ago
6 0
The chemical change of iron would be iron rusting because it a chemical change. Explain it ahah i gotcha its chemical because iron will react to oxygen and for rust which is a new substance.
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What mass of hydrochloric acid (in grams) can 2.7 g of sodium bicarbonate neutralize? (Hint: Begin by writing a balanced equatio
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Answer:

1.17 grams of HCl can neutralize 2.7 grams sodium bicarbonate

Explanation:

Step 1: Data given

Mass of sodium bicarbonate = 2.7 grams

Step 2: The balanced equation

HCl + NaHCO3 ⇔  NaCl + H2O + CO2

Step 3: Calculate moles NaHCO3

moles NaHCO3 =2.7 g / 84 g/mol= 0.032 moles

Step 4: Calculate moles HCl

For 1 mol NaHCO3 we need 1 mol HCl

For 0.032 moles NaHCO3 = 0.032 moles HCl

Step 5: Calculate mass HCl

Mass HCl = moles HCl * molar mass HCl

mass HCl = 0.032 * 36.46 g/mol= 1.17 grams

1.17 grams of HCl can neutralize 2.7 grams sodium bicarbonate

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