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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