How many atoms are there in the molecule CH4 ?
What is the formula for this molecule?
What is this?
What are these? Choose all correct answers.
What is salt water (NaCl + H2O)?
What do compounds have? Choose all correct answers.
The central part of an atom is nucleus.
There are protons in atoms.
The elements can be divided into five main groups.
What is the atomic number of Sodium?
What is made up of one type of one type of atom only?
All compounds are molecules, but not all molecules are compounds.
Soil is a mixture.
What process is this?
What process is this?
What reaction is frying an egg?
What reaction is freezing water?
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