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Molecules & Compounds I
Molecules & Compounds I
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The difference between atoms, elements, molecules & compounds. #science #chemistry
Flashcards
24 cards
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Questions
24
Answers
1
An
ionic
bond between atoms occurs when...
both atoms lose electrons
atoms share electrons
atoms steal electrons from each other
both atoms gain electrons
2
What element is the basis for
all known life
?
Oxygen
Carbon
Hydrogen
Silicon
3
What do water (H
2
O), rust (Fe
2
O
3
), and salt (NaCl) have in common?
They are all elements.
They are all mixtures.
They are all atoms.
They are all compounds.
4
Which is true about what happens when elements form compounds?
the elements retain their original properties
only one element's properties remain
the elements take on entirely new properties
the elements take on some of each other's properties
5
Here's a good way to remember it
: Every compound is a molecule, but not every molecule is a ________.
atom
compound
molecule
element
6
Two or more atoms bonded together is a...
atom
molecule
compound
element
7
What is the
most common element on Earth?
carbon
hydrogen
silicon
oxygen
8
If H
2
O is water, are H
2
O
2
or OH also water?
Yup. Same elements = same compound
No. There are different numbers of atoms.
9
Which is both a
compound
& a
molecule
?
NaCl
O3
H2
He
10
Which substance has 6 atoms?
H2O2
NH4Cl
Na3PO4
NaCl
11
An
organic compound
must contain carbon. Where are organic compounds found?
in stars
in living things
in rocks
in the air
12
How many elements in H
2
O
?
1
2
4
3
13
How many elements in Na
2
SO
4?
2
3
4
5
14
To count the number of elements in a molecule or compounds, you count the number of...
element symbols
numbers in subscript
letters
15
Which is a
molecule
, but not a compound?
CaCO3
N2
CH4
HCl
16
Oxygen & iron combine to form rust. What is rust?
element
compound
mixture
atom
17
How many atoms in C
6
H
12
O
6?
3
12
6
24
18
The
basic building blocks
of all matter are...
compounds
atoms
molecules
mixtures
19
How many atoms in H
2
O
?
2
4
3
1
20
Two or more atoms of different elements bonded together is a...
atom
element
molecule
compound
21
What is the
most common element
in the
universe
?
Silicon
Hydrogen
Oxygen
Carbon
22
A
covalent
bond between atoms occurs when...
both atoms gain electrons
both atoms lose electrons
atoms steal electrons from each other
atoms share electrons
23
If there is no subscript
(little number)
after an element's symbol, you should count it as ___ atom(s).
1
0
24
Which is not an element?
CO
Ar
H2
N4
