Chemical Reactions And Equations Question Preview (ID: 44714)


Review For Chemical Reactions Equations. TEACHERS: click here for quick copy question ID numbers.

Which observation would most likely indicate that an endothermic reaction has occurred?
a) a color change
b) the production of gas bubbles
c) an increase in temperature
d) a decrease in temperature

What does the law of conservation of matter state?
a) matter is always changed into an equal amount of energy
b) matter is neither created nor destroyed
c) the mass of the products is always greater than the mass of the reactants
d) the mass of the products is always less than the mass of the reactants

Which observation would most likely indicate that an exothermic reaction has occurred?
a) a color change
b) the production of gas bubbles
c) an increase in temperature
d) a decrease in temperature

Which of the following is an example of a chemical reaction?
a) water freezes
b) sugar dissolves in water
c) salt and pepper are mixed in a bowl
d) iron rusts

What happens to atoms in a chemical reaction?
a) They turn into energy.
b) They are rearranged.
c) They become atoms of different elements.
d) They are destroyed.

How do you know whether a chemical reaction between two substances has occurred?
a) one substance dissolves in the other
b) one substance melts in the other
c) new substances are created
d) both substances stay separated

When two substances were combined, bubbles formed and the temperature dropped. What does this likely mean?
a) the two substances do not react when combined
b) one substance dissolved in the other
c) the two substances had low boiling points
d) a chemical reaction took place

All of the following are signs of a chemical reaction except one. Which is NOT a sign of a chemical react
a) light or heat is produced
b) a color change
c) gas bubbles is produced
d) one substance dissolves into another

All of the following are physical changes except:
a) ice melting
b) shaping clay
c) paint drying
d) rocket fuel burning

What happens during a chemical change?
a) substances with different properties form a new substance
b) substances with different properties keep their same properties
c) a mixture occurs between two or more substances
d) a solid dissolves in a liquid

The mass of 2 reactants equals 10 grams. After the chemical reaction, what should be the total mass of the products?
a) 0 grams
b) 5 grams
c) 10 grams
d) 20 grams

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