2ESO Atoms, the Periodic Table and Chemical Reactions

Question 1

Which of these is NOT an example of a chemical reaction?

Accepted Answer

Change in size

Question 2

The substances on the left (before a reaction) are called _________________.

Accepted Answer

reactants

Question 3

Who is the father of the periodic table?

Accepted Answer

Mendeleev

Question 4

True or False: The number of atoms changes after a chemical reaction takes place.

Accepted Answer

False

Question 5

The modern periodic table is arranged in order of increasing __________________.

Accepted Answer

atomic number

Question 6

True or False: the number of neutrons determines the isotopes of an element.

Accepted Answer

True

Question 7

What is the smallest unit of matter?

Accepted Answer

atom

Question 8

The lower the temperature, the ________________ the reaction.

Accepted Answer

slower

Question 9

Which of these particles has a positive charge?

Accepted Answer

proton

Question 10

Which element has the lowest atomic number?

Accepted Answer

Hydrogen

Questions 10