Physical Science Ch 6 Test 2: Question Preview (ID: 2899)

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