How many atoms are there in the molecule CH4 ?
1
2
3
4
5
How many atoms are there in the molecule CH4 ?
1
2
3
4
5
What is the formula for this molecule?
CO2
CO3
CO
What is this?
molecule
atom
mixture
What are these? Choose all correct answers.
molecules
compounds
mixture
solution
What is salt water (NaCl + H2O)?
element
compound
mixture
What do compounds have? Choose all correct answers.
chemical bonds
elements
electrons
The central part of an atom is nucleus.
True
False
There are protons in atoms.
True
False
The elements can be divided into five main groups.
True
False
What is the atomic number of Sodium?
Na
11
22.99
What is made up of one type of one type of atom only?
element
compound
solution
alloy
All compounds are molecules, but not all molecules are compounds.
True
False
Soil is a mixture.
True
False
What process is this?
evaporation
filtration
sieving
distillation
spinning
magnetism
What process is this?
distillation
spinning
sieving
evaporation
magnetism
What reaction is frying an egg?
physical
chemical
What reaction is freezing water?
physical
chemical
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