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Elements
Elements
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Elements and how they are in certain portions in the earth, atmosphere and human body.
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Answers
1
What are the two most plentiful elements in the earth's atmosphere?
Oxygen and Nitrogen
Oxygen and Lithium
Potassium and Nitrogen
Oxygen and Silicon
2
What are the two most plentiful elements in earth's crust?
silicon and oxygen
helium and hydrogen
calcium and nitrogen
calcium and oxygen
3
How many elements are in this chemical formula? H2O2
4
1
2
3
4
How many elements are in this chemical formula? NaHCO3
2
3
4
1
5
How many elements are in this chemical formula? NaCNO
1
2
4
3
6
The amount of subatomic particles in an atom.
2
3
4
7
Forming a new substance that cannot be undone by physical means.
chemical change
physical change
8
Changing the physical properties of a substance without changing the identity.
chemical change
physical change
9
What elements make up water?
Hydrogen and Nitrogen
Oxygen and Helium
Sodium and Oxygen
Hydrogen and Oxygen
10
A precipitate can be formed by combining ____________?
three liquids
powders
two liquids
liquids and a powder
11
CHNOPS is used to remember what living things are made of. What does it represent?
Carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur
Carbon, hydrogen, nitrogen oxygen, phosphorus, silicon
12
How many atoms are in this chemical formula?NaHCl3
3
2
5
6
13
The small number after an element symbol in a chemical formula.
subscript
compound
co-efficient
14
A pure substance that cannot be broken down by chemical means.
element
compound
chemical reaction
physical reaction
15
This has a positive charge.
electrons
newtrons
protons
