Elements And Compounds Question Preview (ID: 60032)


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Stacey has a balloon filled with baking soda. She fits the balloon over the top of a plastic bottle with vinegar. When she lifts the balloon it pours the baking soda into the vinegar, causing bubbles to form and the balloon to inflate. What happened?
a) A chemical reaction occurred, producing a solid.
b) No chemical reaction took place.
c) A chemical reaction occurred, producing a gas.
d) Only a physical change happened.

Which of the following is a chemical property associated with wood?
a) Burning
b) Snapping
c) Floating
d) Rough Surface

Which of the following does NOT indicate a chemical reaction occurred?
a) Production of gas
b) Solid being formed
c) No change in temperature
d) Change in temperature

The Chemical equation for photosynthesis is CO2 + H2O → C6H12O6 + O2. What substance in this equation represents an Element?
a) H2O
b) O2
c) CO2
d) C6H12O6

Which of the following are all elements?
a) Ba, C, N, Fe, O
b) Ba, NO, Fe, LiF
c) Ba, C, LiF, N, O
d) C, N, LiF, Fe, O

Which of the following is NOT an element?
a) Helium
b) Neon
c) Water
d) Nitrogen

A student is trying use chemical formulas to classify substances as an element or a compound. Which of the following should they classify as an element??
a) CO
b) Ba
c) NO
d) H2O

A student is trying use chemical formulas to classify substances as an element or a compound. Which of the following should they classify as compound?
a) He- Helium
b) Water- H20
c) Mg- Magnesium
d) C- Carbon

What is the simplest form a substance can be?
a) Element
b) Compound
c) Mixture
d) Chemical

What forms when two or more elements are chemically combined?
a) Element
b) Compound
c) Mixture
d) Solution

Which of the following is a chemical compound and Why?
a) He, because it has one element
b) He, because it has more than one element
c) CO2, because it has more than one element.
d) CO2, because it has one element

Which of the following does not represent what an element is?
a) A boulder made entirely of granite rock
b) A carton full of spinach only.
c) A brick wall made from many identical bricks.
d) A gum ball machine with many different colors and sizes of candy inside.

Which of the following statements is true about elements?
a) Elements are represented by chemical symbols.
b) Elements are composed of two or more elements.
c) H2O is an example of an element.
d) Elements are represented by chemical formulas.

During science class, a teacher places sugar on a spoon and heats it over a candle. Which of the following would best show that a chemical change has happened?
a) The sugar gets hotter
b) The sugar gets larger
c) The sugar gets black
d) The sugar turns into a liquid.

When vinegar and baking soda are combined, bubbles and foam are produced. What evidence shows that a chemical change has occured?
a) A color change occurs.
b) A solid is dissolved.
c) A precipitate is formed.
d) A gas is formed.

Which of the following shows that a chemical change has happended?
a) Gas produced
b) Color change
c) Temperature change
d) All of the Above

A solid produced by a chemical reaction in solution that separates from the solution is called
a) a precipitate
b) reactant
c) molecule
d) solution

When limestone is subjected to high heat, it becomes calcium oxide and releases carbon dioxide gas. This change in limestone, at a given temperature, is an example of:
a) a physical change
b) a reversible change
c) an igneous change
d) a chemical change

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