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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 cannot be created not destroyed
C
matter is in every object
D
none of the choices
2) In a balanced chemical equation, the mass of the reactants is equal to the
A
mass of the products
B
atomic mass of the elements
C
atoms in a molecule
D
volume of the reactants
3) What coefficient is missing in C2H4 + (?) O2 = 2CO2 + 2H2O?
A
2
B
5
C
3
D
4
4) Which of the following represents the word equation magnesium + oxygen = magnesium oxide?
A
2CH4 + O2 = 2CH3OH
B
CH4 + O2 = CH4O2
C
2Mg + O2 = 2MgO
D
MgO + O = MgO2
5) Which of these equations is not balances?
A
2Mg + O2 = 2MgO
B
Fe + S = FeS
C
KOH + HCl = KC + H2O
D
NaCl + H2SO4 = Na2SO4 + HCl
6) At higher temperatures, food cooks faster because particles of food
A
increase in number
B
come into contact with water
C
take up less space
D
collide more often
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
high, large
B
high, small
C
low, small
D
low, large
9) Which is not true of enzymes
A
they are inefficient
B
they are catalysts
C
they are proteins
D
they are affected by temperature
10) All of these are likely to speed up the rate of a reaction except
A
increasing the temperature
B
decreasing the surface area
C
adding a catalyst
D
increasing the pressure
*select an answer for all questions
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