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Physical Science Ch 6 Test 2
Test Description: Chemical reactions
Instructions: Answer all questions to get your test result.
1) The law of conservation of matter states
A
matter changes from phase to phase
B
matter is in every object
C
matter cannot be created not destroyed
D
none of the choices
2) In a balanced chemical equation, the mass of the reactants is equal to the
A
volume of the reactants
B
atoms in a molecule
C
atomic mass of the elements
D
mass of the products
3) What coefficient is missing in C2H4 + (?) O2 = 2CO2 + 2H2O?
A
5
B
3
C
2
D
4
4) Which of the following represents the word equation magnesium + oxygen = magnesium oxide?
A
CH4 + O2 = CH4O2
B
2CH4 + O2 = 2CH3OH
C
MgO + O = MgO2
D
2Mg + O2 = 2MgO
5) Which of these equations is not balances?
A
KOH + HCl = KC + H2O
B
2Mg + O2 = 2MgO
C
Fe + S = FeS
D
NaCl + H2SO4 = Na2SO4 + HCl
6) At higher temperatures, food cooks faster because particles of food
A
come into contact with water
B
collide more often
C
increase in number
D
take up less space
7) Catalysts that slow reactions are called
A
substrates
B
endothermic
C
inhibitors
D
balanced
8) A slow reaction is likely to occur when the reactants have _________ temperatures and ________ surface areas.
A
low, small
B
low, large
C
high, large
D
high, small
9) Which is not true of enzymes
A
they are proteins
B
they are affected by temperature
C
they are catalysts
D
they are inefficient
10) All of these are likely to speed up the rate of a reaction except
A
increasing the temperature
B
adding a catalyst
C
increasing the pressure
D
decreasing the surface area
*select an answer for all questions
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