True or false?
The properties of a compound will be the same as the properties of the elements that make up the compound.
False
100
Which one of the following is a mixture?
Iron sulfide
Oxygen
Water
Sea water
sea water
100
Which of the following is an element?
Sugar
Water
Steam
Snow
Iron
iron
100
Where two or more substances are mixed together but not chemically combined, this substance is called
mixture
200
The nucleus of an atom consists of:
protons and neutrons
200
Hydrogen gas (H2) is a compound?
No - it's a molecule
200
Which of the following is not a mixture?
A: cereal and milk
B: koolaid
C: water
D: fruit salad
c. water
200
Are there more compounds or more elements?
compounds
200
a substance made up of two or more elements chemically combined
compound
300
A single proton has what electrical charge?
positive charge
300
True or False
The proportions of the elements in a compound are always fixed.
True
300
How many classifications of mixtures are there?
Two
300
A mixture is two or more substances. It __________ be separated?
A. Can
B. Can not
A. can
300
The smallest particle of an element that still has the properties of that element
atom
400
An element is determined by the number of:
protons
400
True or False
It is easy to separate the elements of a compound.
False
400
Which is the best way to get salt from salty water?
a. evaporation
b. filtration
c. distillation
a. evaporation
400
Salad dressing
a. Homogenous
b. Heterogenous
b. Heterogenous
400
The negatively charged particles orbiting the nucleus of the atom making up the electron cloud (almost no mass)
electron
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Which particles have approximately the same size and mass as each other?
protons and neutrons
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Is table salt a compound?
Yes - NaCl
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What is the correct order for obtaining salt from a mixture of sand and salt?
a. dissolving in water - filtration - evaporation
b. evaporation - filtration - dissolving in water
c. filtration - dissolving in water - evaporation