Chemical Reactions 1 Question Preview (ID: 35972)
Chemical Reactions, Endo And Exothermic.
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The combustion reaction of propane can be written in the following balanced chemical equation: C3H8(g) + 5 O2(g) → 3CO2(g) + 4H2O(g) In this reaction, propane (C3H8) is considered one of the __________.
a) reactants
b) waste products
c) ions
d) products
CH4 + 2O2 → CO2 + 2H2O How many products are produced by this reaction?
a) 4
b) 3
c) 2
d) 1
Select the true statement:
a) Bonds do not change in either chemical reactions or physical changes.
b) Bonds are broken and new bonds are formed during chemical reactions only.
c) Bonds are broken and new bonds are formed during physical changes only.
d) Bonds are broken and new bonds are formed during both chemical reactions and physical changes.
Chemical substances often go through physical and chemical changes. Chemical changes are different from physical changes because chemical changes __________.
a) can change a solid to a liquid
b) have new molecules as products
c) can be undone to recover the reactants
d) are easily reversible
Which of the following is NOT an example of a chemical reaction?
a) a marshmallow releasing carbon when burned
b) a candle burning forming carbon dioxide
c) ice turning into water
d) sodium and chlorine forming salt
Scientists observe that when lithium reacts with water, two new substances are formed (lithium hydroxide and hydrogen). They predict that the substances formed will have:
a) different properties than lithium and water have separately.
b) the same properties as lithium only.
c) a mixture of the properties of lithium and water.
d) the same properties as lithium and water have separately.
Which of the following may signal that a new substance has formed?
a) bubbles
b) color change
c) a solid forms when two liquids mix (precipitate)
d) all of these
The best evidence for a chemical reaction occurring would be:
a) Change in temperature
b) Change in state of a chemical (ex. from a solid to a liquid)
c) Change in shape or form of a chemical
d) The formation of new substances
Heat and light are released during combustion. The release of heat and light is evidence that combustion is a
a) endothermic reaction
b) reversible process
c) chemical reaction
d) physical process
The following chemical equation describes the process of cellular respiration. C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l) Which of the following is considered a reactant of cellular respiration?
a) CH2O3
b) H2O
c) CO2
d) C6H12O6
Hydrogen and oxygen combine to form water. In this chemical reaction, which represents the reactant(s)?
a) hydrogen and oxygen
b) hydrogen and water
c) oxygen and water
d) water
An investigator is performing a chemical reaction between potassium metal and chlorine gas to form potassium chloride. In this reaction, the reactant(s)
a) is potassium chloride
b) is potassium metal only
c) are potassium metal and chlorine gas
d) is chlorine gas only
Photosynthesis is the process by which plants use carbon dioxide, water, and energy from the sun to form oxygen and energy–rich sugar molecules. In this reaction, oxygen and energy–rich sugar molecules are the only __________.
a) gases
b) products
c) reactants
d) wastes
Your science teacher does a demonstration where she mixes together baking soda (sodium bicarbonate) and vinegar (acetic acid). The reaction bubbles up and forms water, carbon dioxide and sodium acetate. The products in this reaction are __________.
a) sodium bicarbonate, water and carbon dioxide
b) water, carbon dioxide and acetic acid
c) water, carbon dioxide and sodium acetate
d) sodium bicarbonate and acetic acid
The chemical word equation for the process of photosynthesis is: carbon dioxide + water → glucose + oxygen The reactant(s) for the process of photosynthesis
a) is water only
b) is glucose only
c) are water and carbon dioxide
d) are glucose and oxygen
The formation of water from oxygen and hydrogen can be described in the following word equation: oxygen gas+ hydrogen gas → liquid water In this reaction, liquid water is the __________.
a) only compound
b) waste
c) reactant
d) product
In a chemical reaction, in order to make a product, you must either break apart or combine _________.
a) producers
b) reactants
c) enzymes
d) catalysts
Cellular respiration is the process by which organisms form energy molecules and carbon dioxide by a chemical reaction between oxygen and glucose. In this reaction, oxygen and glucose are the _________.
a) gases
b) waste products
c) reactants
d) products
The burning of methane gas can be described in the following chemical word equation: methane + oxygen → carbon dioxide + water The product(s) of this equation
a) are methane and oxygen
b) is water only
c) are carbon dioxide and water
d) is carbon dioxide only
You are balancing a chemical equation and you start with 6 H2O molecules. When the equation is balanced, you would expect to have __________ hydrogen atoms accounted for in the products.
a) 18
b) 12
c) 2
d) 6
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