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Elements And Compounds - Part 2
Test Description: CBA 2 review - TEKS 6.5A, 6.5B, and 6.5C
Instructions: Answer all questions to get your test result.
1) Elements are represented by chemical symbols. How many letters are in the chemical symbols of elements?
A
always two
B
only one
C
sometimes one, sometimes two
D
as many as you want
2) Is NaCl an element or a compound?
A
compound
B
element
C
neither
D
both
3) What type of substance is Au (gold)
A
neither
B
both
C
compound
D
element
4) One difference between elements and compounds is that there are an infinite number of elements, but only a limited number of compounds.
A
False
B
True
5) Which element makes up most of the Earth's atmosphere?
A
oxygen
B
nitrogen
C
hydrogen
D
carbon
6) The Earth's crust is primarily made up of which two elements?
A
oxygen and carbon
B
hydrogen and silicon
C
silicon and oxygen
D
nitrogen and hydrogen
7) What is a substance that can't be broken down into simpler substances?
A
mixture
B
element
C
compound
D
solution
8) Which of these phrases would you use to describe a substance but NOT a mixture
A
pure, uniform throughout
B
form of matter
C
none of the above
D
blend of compounds
9) All of the following are characteristic of neon. Which characteristic makes it an element?
A
a compound of two or more atoms that have been chemically combined.
B
made of one type of atom
C
relatively rare on Earth
D
colorless gas
10) Nitrogen is a major component of living things on Earth
A
False
B
True
11) One difference between elements and compounds is that an element consists of only one type of matter, while a compound consists of two or more types.
A
False
B
True
12) Which two elements make up the majority of all oceans on Earth?
A
oxygen and hydrogen
B
nitrogen and carbon
C
hydrogen and carbon
D
oxygen and nitrogen
13) Which one of these elements is NOT one of the three most abundant elements in plants and animals?
A
carbon
B
oxygen
C
hydrogen
D
iron
14) One difference between elements and compounds is that an element consists of only one type of matter, while a compound consists of two or more types.
A
True
B
False
15) Elements are made up of a uniform composition
A
false
B
true
16) A compound can never be a uniform composition
A
false
B
true
17) Which two elements primarily make up the Earth's atmosphere?
A
nitrogen and hydrogen
B
nitrogen and helium
C
silicon and helium
D
oxygen and nitrogen
18) Which list contains elements that make up most living things on Earth?
A
hydrogen, oxygen and silicon
B
carbon, hydrogen, and oxygen
C
oxygen, sulfur, and carbon
D
sulfur, helium, and nitrogen
*select an answer for all questions
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