chemical changes
Authored by Leong Yew Sheng Nicholas
Chemistry
9th Grade
8 Questions
Used 18+ times
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1.
MULTIPLE SELECT QUESTION
1 min • 3 pts
Which scenarios involve a chemical change?
baking a cake
melting of ice
brushing teeth with toothpaste
rusting of nails
photosynthesis in plants
2.
MULTIPLE SELECT QUESTION
1 min • 3 pts
Which statements illustrate a chemical reaction?
Total mass of the atoms is conserved during the reaction.
New substance is formed.
Total number of atoms remained the same during the reaction.
Most chemical changes cannot be reversed.
3.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
methane + oxygen -> carbon dioxide + water.
Which substances are the reactants in the reaction?
methane
oxygen
carbon dioxide
water
4.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
methane + oxygen -> carbon dioxide + water.
Which substances are the products in the reaction?
methane
oxygen
carbon dioxide
water
5.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
hydrochloric acid + magnesium metal -> magnesium chloride + hydrogen gas.
Which substances are reactants in the reaction?
hydrochloric acid
magnesium metal
magnesium chloride
hydrogen gas
6.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
hydrochloric acid + magnesium metal -> magnesium chloride + hydrogen gas.
Which substances are products in the reaction?
hydrochloric acid
magnesium metal
magnesium chloride
hydrogen gas
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Where are the reactants found in a chemical equation?
left side of the equation before the arrow.
right side of the equation before the arrow.
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