Chemistry - Grade 8 Review

Question 1

Which letter in this image shows a transition element?

Accepted Answer

D

Question 2

Which clue to a chemical change is seen here?

Accepted Answer

Precipitate formed

Question 3

Which of these choices would have TWO valence electrons?

Accepted Answer

B

Question 4

Letter "G" would be part of which family?

Accepted Answer

Halogens

Question 5

What is a "valence electron"?

Accepted Answer

e- furthest from nucleus, w/ high energy, & used in bonds

Question 6

Which of these atoms would stabilize each other the BEST?

Accepted Answer

1 Mg + 1 S

Question 7

Which particle determines the actual element itself?

Accepted Answer

proton

Question 8

Which of the following E- dot diagrams are the MOST incorrect?

Accepted Answer

3

Question 9

Which of the following BEST describes the modern atomic model?

Accepted Answer

A cloud with e- in energy levels & a nucleus w/ n0 & p+

Question 10

What two particles make up structure "B" in this picture?

Accepted Answer

Protons & Neutrons

Question 11

What is the mass number of the atom shown?

Accepted Answer

7

Question 12

What group would this unknown element appear in?

Accepted Answer

15

Question 13

Which of the following does NOT describe a chemical change?

Accepted Answer

Changing the physical characteristics of an object.

Question 14

Which of these options would be found in period 2?

Accepted Answer

C

Question 15

What type of change is being shown in this video?

Accepted Answer

Physical - change of state

Question 16

Which of the following is NOT a chemical change?

Accepted Answer

Dissolving salt

Question 17

How was the original periodic table arranged?

Accepted Answer

Atomic Mass

Question 18

How many electrons should this atom have?

Accepted Answer

14

Question 19

Which of the atoms in this picture has FOUR valence electrons?

Accepted Answer

Si

Question 20

Which particle(s) make up the mass of an atom?

Accepted Answer

neutrons & protons

Question 21

If an atom is highly reactive, which of the following would be FALSE?

Accepted Answer

It would be found pure in nature.

Question 22

What is highlighted in this image?

Accepted Answer

Groups of the periodic table

Question 23

Which of these elements are most likely to be radioactive?

Accepted Answer

G

Question 24

Which particle is positively charged?

Accepted Answer

proton

Question 25

Which of these options would be part of the INNER transition elements?

Accepted Answer

NONE of these

Question 26

Which of these atoms would be the LARGEST?

Accepted Answer

E

Question 27

Elements with similar CHEMICAL PROPERTIES are sorted into ___.

Accepted Answer

Groups, Families

Question 28

Which of the options below would be the MOST reactive?

Accepted Answer

E

Question 29

What is the atomic number of the atom shown?

Accepted Answer

3

Question 30

Which of the following atoms would have 5 p+, 6 n0, & 5 e-?

Accepted Answer

#5 Boron (10.811)

Question 31

Which particle will change to produce an ION?

Accepted Answer

electron

Question 32

Letter "I" can conduct electricity, but not very well. What is this called?

Accepted Answer

Metalloid, Semiconductor

Question 33

What is an ISOTOPE?

Accepted Answer

An atom with a new mass from changing the neutrons.

Question 34

When all atoms in a substance are EXACTLY the same it is called a(n) ___.

Accepted Answer

Element

Question 35

Which particle has a neutral charge?

Accepted Answer

neutron

Question 36

Which letter in this image shows an Alkali Metal?

Accepted Answer

E

Question 37

Which of the following options shows the electron cloud?

Accepted Answer

F

Question 38

What is considered a "stable" number of valence electrons?

Accepted Answer

8

Question 39

What is letter "A" showing in the picture?

Accepted Answer

Energy Level

Question 40

What did Mosely & later scientists do to Mendeleev's table?

Accepted Answer

Arranged it by atomic number

Chemistry - Grade 8 Review

Questions 40

Chemistry - Grade 8 Review

Questions 40