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