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Elements And Compounds
Test Description: Compound and element
Instructions: Answer all questions to get your test result.
1) Which of the following statements is true about elements?
A
H2O is an example of an element.
B
Elements are represented by chemical symbols.
C
Elements are composed of two or more elements.
D
Elements are represented by chemical formulas.
2) Which of the following does not represent what an element is?
A
A brick wall made from many identical bricks.
B
A carton full of spinach only.
C
A gum ball machine with many different colors and sizes of candy inside.
D
A boulder made entirely of granite rock
3) Which of the following is a chemical compound and Why?
A
CO2, because it has one element
B
He, because it has one element
C
He, because it has more than one element
D
CO2, because it has more than one element.
4) What forms when two or more elements are chemically combined?
A
Element
B
Compound
C
Mixture
D
Solution
5) What is the simplest form a substance can be?
A
Element
B
Mixture
C
Compound
D
Chemical
6) 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
Water- H20
B
C- Carbon
C
Mg- Magnesium
D
He- Helium
7) 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
Ba
B
NO
C
CO
D
H2O
8) Which of the following is NOT an element?
A
Neon
B
Water
C
Helium
D
Nitrogen
9) Which of the following are all elements?
A
Ba, C, LiF, N, O
B
Ba, NO, Fe, LiF
C
C, N, LiF, Fe, O
D
Ba, C, N, Fe, O
10) The Chemical equation for photosynthesis is CO2 + H2O → C6H12O6 + O2. What substance in this equation represents an Element?
A
O2
B
CO2
C
C6H12O6
D
H2O
11) Which of the following does NOT indicate a chemical reaction occurred?
A
Production of gas
B
Change in temperature
C
Solid being formed
D
No change in temperature
12) Which of the following is a chemical property associated with wood?
A
Burning
B
Rough Surface
C
Floating
D
Snapping
13) 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
Only a physical change happened.
B
A chemical reaction occurred, producing a gas.
C
A chemical reaction occurred, producing a solid.
D
No chemical reaction took place.
14) 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 turns into a liquid.
B
The sugar gets larger
C
The sugar gets hotter
D
The sugar gets black
15) When vinegar and baking soda are combined, bubbles and foam are produced. What evidence shows that a chemical change has occured?
A
A gas is formed.
B
A solid is dissolved.
C
A precipitate is formed.
D
A color change occurs.
16) Which of the following shows that a chemical change has happended?
A
Temperature change
B
Gas produced
C
All of the Above
D
Color change
17) A solid produced by a chemical reaction in solution that separates from the solution is called
A
reactant
B
molecule
C
solution
D
a precipitate
18) 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 chemical change
B
a physical change
C
an igneous change
D
a reversible change
*select an answer for all questions
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