Law of conservation of matter

Quiz by Susan Coffey

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10 questions
• Q1
A student asks why the ashes from a fire have a much lower mass than the wood that was burned. Which is the correct answer to the student’s question?
Gases are released into the air.
Water inside the wood solidifies.
Atoms in the wood are destroyed.
Heat causes molecules to lose density.
30s
• Q2
The reaction below shows potassium oxide being produced (KO₂) by combining oxygen (O₂) with potassium (K). The mass of potassium is 50 g and the mass of oxygen is 12 g. What is the mass of the product KO₂? O₂ + K ------> KO₂
50 grams
62 grams
12 grams
160 grams
45s
• Q3
Iron (Fe) reacts with Oxygen (O) to form iron oxide (FeO) which is commonly called rust. 2Fe + 3O₂---> 2FeO₃ Which chemical formula shown below is the product of this reaction?
a. Iron (Fe)
3O₂
2FeO₃
Iron dioxide
45s
• Q4
A balanced chemical equation reflects the idea that the mass of the products--
equals the mass of the reactants
is not related to the mass of the reactants
is greater than the mass of the reactants
is less than the mass of the reactants
45s
• Q5
The law of conservation of mass can be demonstrated by a chemical reaction. Which of the models in the graphic best represents the law of conservation of matter?
B
C
D
A
45s
• Q6
How many total atoms are on the reactant side of this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
4
0
5
3
45s
• Q7
How many hydrogens are on the reactant side of this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
0
1
3
2
45s
• Q8
How many chlorines are on the product side of this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
1
2
0
3
45s
• Q9
How many total atoms are on the product side of this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
0
5
4
3
45s
• Q10
What are the names of the elements involved in this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
hydrogen, zinc, and carbon
zinc, chlorine & helium
carbon, hydrogen, & zirconium
zinc, hydrogen, & chlorine
45s

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