1 answer:

Blank # 1 - keep safe distance from the burner
Blank # 2 - Place the equipments on the right place after use
Blank # 3 - perform experiments with proper lab equipment and safety tools
Blank # 4 - Don't break any test tube or lab equipment
(maybe it can be hazardous)
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there are 92 naturally occuring elements
Answer:
B
Explanation:
A radioactive particle
Answer:
The Bohr model of the atom explains the reactivity of all atoms.
Answer:
the last one
27% by 73%
Explanation:
12/44*100 for C
and
16/44*100 for O
The best answer choice here would be 'Combination'