Chemical Reactions Question Preview (ID: 13018)
Evidence Of A Chemical Reaction, Mixtures, Compounds, And Elements Based On Arizona Standards.
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Two white-colored solids were mixed in a beaker. The mixture remained white, and the beaker began to turn cold after a few minutes. Why has a chemical reaction occurred?
a) The beaker did not break
b) The solids did not melt.
c) The temperature decreased.
d) The mixture remained white-colored.
Which of the following is evidence of a chemical reaction?
a) a solid melting when it becomes too hot
b) a mixture of two liquids producing heat
c) a gas condensing into liquid when it cools
d) density changing based on temperature or pressure
Which of the following involves a chemical reaction?
a) evaporation
b) combustion
c) condensation
d) dissolution
Which of the following involves a chemical reaction?
a) chopping wood
b) painting wood
c) burning wood
d) carving wood
Two homogeneous liquids are mixed together. What evidence suggests that a chemical reaction is occurring?
a) The mixture remains a liquid.
b) The mixture's temperature decreases.
c) The mixture forms a homogeneous solution.
d) The mixture's volume decreases over several hours.
A piece of metal was dropped into a beaker of clear liquid.The metal sank to the bottom and bubbles began to form in the liquid. Why is there a chemical reaction?
a) The metal sank to the bottom.
b) The bubbles formed in the liquid.
c) The liquid remained clear.
d) The beaker did not break.
Sodium hydroxide pellets are added to an open container of water. What evidence suggests that a chemical reaction is occurring?
a) The pellets dissolve.
b) The water remains clear.
c) The container becomes warm.
d) The liquid evaporates over time.
Which of the following involves a chemical reaction?
a) dissolving a solid in a liquid
b) mixing an acid with a base
c) breaking a solid into pieces
d) evaporating a liquid into gas
Which of the following is evidence of a chemical reaction?
a) the disappearance of a solid after it dissolves in a liquid
b) the appearance of water droplets on a glass of iced tea
c) the appearance of gas bubbles when two substances are mixed
d) the disappearance of a liquid as it evaporates in warm temperatures
Which of the following is a compound?
a) sodium
b) carbon
c) ammonia
d) helium
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