Chemical Reactions

Question 1

What is the sentence to identify diatomic elements?

Answer 1

I Have No Bright Or Clever Friends

Question 2

What are the elements in that sentence?

Answer 2

I, H, N, Br, O, C, F

Question 3

What are the three types of chemical reactions?

Answer 3

Precipitation, neutralization, and oxydation/redox

Question 4

What happens to the constituents once in contact during precipitation?

Answer 4

They change colours or state once in contact with each other.

Question 5

What is neutralisation?

Answer 5

When an acid and a base bound.

Question 6

What is oxydation (redox)?

Answer 6

When there is a transfer of electrons between two species. A molecule, ion or atom changes by gaining or losing electrons.

Question 7

What is double displacement?

Answer 7

When the atoms in a polyatomic compound change place with other atoms in a polyatomic compound.

Question 8

MgO + CaS —> ___ + ___ (double displacement)

Answer 8

MgS + CaO

Question 9

HCl + NaOH = ___ + ___ [neutralization]

Answer 9

NaCl + H(2)O

Question 10

Zn (solid) + 2HCl (aqueous) = ___ (aqueous) + ___ (gas)

Answer 10

ZnCl(2) + H(2)

Question 11

Are organic reactions redox, precipitation or neutralization?

Answer 11

Redox

Question 12

How are chemical reactions balanced?

Answer 12

By changing the coefficients (rational numbers are also allowed)