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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 is in every object
B
none of the choices
C
matter changes from phase to phase
D
matter cannot be created not destroyed
2) In a balanced chemical equation, the mass of the reactants is equal to the
A
atomic mass of the elements
B
atoms in a molecule
C
volume of the reactants
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
2Mg + O2 = 2MgO
B
2CH4 + O2 = 2CH3OH
C
MgO + O = MgO2
D
CH4 + O2 = CH4O2
5) Which of these equations is not balances?
A
Fe + S = FeS
B
2Mg + O2 = 2MgO
C
KOH + HCl = KC + H2O
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
take up less space
D
increase in number
7) Catalysts that slow reactions are called
A
endothermic
B
substrates
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 affected by temperature
B
they are inefficient
C
they are proteins
D
they are catalysts
10) All of these are likely to speed up the rate of a reaction except
A
increasing the temperature
B
adding a catalyst
C
decreasing the surface area
D
increasing the pressure
*select an answer for all questions
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