Chemical Reactions: Question Preview (ID: 17328)


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Which of the following is a chemical reaction?
a) cutting paper
b) making a cake
c) melting an ice cube
d) making lemonade

When substances undergo chemical changes, a chemical reaction occurs and new substances are formed.
a) True
b) False
c)
d)

In a chemical reaction, the starting substances on the left side of the equation is called
a) products
b) reactants
c) mixtures
d) atoms

In a chemical reaction, the ending substances on the right side of the equation is called
a) products
b) reactants
c) mixtures
d) atoms

Rust is a combination of what two elements
a) Hydrogen and Oxygen
b) Nitrogen and Lithium
c) Carbon and Iron
d) Iron and Oxygen

An example of a physical change is
a) rust on a car
b) frying an egg
c) chopping wood in half
d) photosynthesis

When a chemical reaction gives off heat after the reaction occurs, it is called
a) endothermic
b) exothermic
c) compound
d) mixture

Which of the following shows that you a chemical reaction occured
a) color change
b) gas bubbles
c) temperature change
d) all answers are correct

What coefficent can be added to this equation to balance it? __NO2 + Cl2 = 2ClO2 + N2
a) 0
b) 1
c) 2
d) 3

What coefficent can be added to this equation to balance it? 3. N2 + __H2 -----------→ 2NH3
a) 1
b) 2
c) 3
d) 4

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