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Q 1/25
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
physical, chemical, physical, chemical
chemical, chemical, chemical, physical
physical, physical, chemical, chemical
physical, physical, physical, chemical
Q 2/25
Score 0
Which of the following represents a chemical change to matter?
30
digestion of food
cutting wood
shredding paper
melting an ice cube
25 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 of the following represents a chemical change to matter?
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.
A chemical reaction takes place within a test tube. After the reaction, the test tube feels warmer than it did before the reaction. The reaction was
5
30 sec
Q.
During an endothermic reaction, energy is
6
30 sec
Q.
What type of reaction does the generalized equation A + B → AB represent?
7
30 sec
Q.
What type of reaction does the generalized equation AB → A + B represent?
8
30 sec
Q.
Which of the following is a synthesis reaction?
9
30 sec
Q.
All chemical reactions involve a transfer of energy.
10
30 sec
Q.
Though energy can change forms, the total amount of energy in the universe remains constant.
11
30 sec
Q.
In a chemical reaction, there must be the same number of atoms in the product side as there are on the reactants side.
12
30 sec
Q.
In the chemical formula CH4, how many atoms of hydrogen (H) are there?
13
45 sec
Q.
In the chemical formula 2 NO2, how many atoms of oxygen (O) are there?
14
45 sec
Q.
Which number should be placed in the blank to balance the equation? Xe + ___ F2 → XeF2.
15
60 sec
Q.
How many total carbon (C) atoms are present in the reactants side of the equation C2H5OH + 3O2 → 2CO2 + 3H2O?
16
45 sec
Q.
In nuclear fission, atomic nuclei are
17
30 sec
Q.
In a nuclear power plant, the chain reaction takes place within the
18
45 sec
Q.
Most nuclear waste in the US is
19
30 sec
Q.
Which type of nuclear waste can be MOST safely handled?
20
30 sec
Q.
Nuclear power has the advantage over coal in that nuclear power does not produce as much carbon dioxide as coal.
21
30 sec
Q.
Which of the following takes place during a single displacement reaction?
22
30 sec
Q.
When chemical bonds are formed, energy is
23
30 sec
Q.
Two light nuclei combine to form a heavier one in nuclear
24
30 sec
Q.
If an atomic nucleus spontaneously emits two protons and two neutrons, then what has taken place?
