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Q 1/12
Score 0
A glass of water undergoes four changes: First it is frozen solid. Next, the ice is crushed into small pieces of ice. Third, the ice melts, and fourth, an electrical current is passed through the water to separate out hydrogen and oxygen. Which of the following represents the correct sequence of changes to the water?
60
chemical, chemical, chemical, physical
physical, chemical, physical, chemical
physical, physical, physical, chemical
physical, physical, chemical, chemical
Q 2/12
Score 0
Which statement best describes a chemical reaction?
30
In a chemical reaction, one or more substances called products are combined or broken down to form reactants.
In a chemical reaction, one or more substances called reactants are combined or broken down to form products
In a chemical reaction, one or more substances called products are combined or broken down to form compounds.
12 questions
Q.
A glass of water undergoes four changes: First it is frozen solid. Next, the ice is crushed into small pieces of ice. Third, the ice melts, and fourth, an electrical current is passed through the water to separate out hydrogen and oxygen. Which of the following represents the correct sequence of changes to the water?
1
60 sec
Q.
Which statement best describes a chemical reaction?
2
30 sec
Q.
Consider the equation S + O2 → SO2. What is the product?
3
30 sec
Q.
In an exothermic reaction, energy may be released to the surroundings in the form of
4
30 sec
Q.
Which of the following indicates that an exothermic reaction has taken place?
5
30 sec
Q.
Because it needs sunlight to proceed, what type of reaction is photosynthesis?
6
30 sec
Q.
Consider the equation 4 Fe+3 O2 → 2 Fe2O3 . In this equation, 3 O2 is a
7
30 sec
Q.
Which of the following is an example of a physical change to matter?
8
30 sec
Q.
In a cold pack, which type of reaction draws heat from the surroundings?
9
30 sec
Q.
What type of reaction is the equation C + O2 → CO2?
10
30 sec
Q.
Which generalized equation represents a synthesis reaction?
11
30 sec
Q.
Which generalized equation represents a single displacement reaction?
