Science 9

Question 1

The reason for the chemical similarity among elements of a given group in the periodic table is

Accepted Answer

similarity in the highest orbit electrons

Question 2

Schrodinger’s cat walks into a bar and...

Accepted Answer

doesnt

Question 3

Which group in the periodic table contains the noble gases?

Accepted Answer

18

Question 4

In which group of the periodic table are the halogens found?

Accepted Answer

17

Question 5

Which of the following groups of elements contains only metalloids?

Accepted Answer

Ge, As, Sb, Te

Question 6

The particle theory of matter is a useful scientific model because...

Accepted Answer

it allows scientists to explain many properties of matter.

Question 7

Isotopes of an element have different...

Accepted Answer

numbers of neutrons.

Question 8

Which one of the following substances is an element?

Accepted Answer

Helium

Question 9

A pure substance consisting of two or more kinds of atoms is considered to be...

Accepted Answer

a compound

Question 10

What is the best number?

Accepted Answer

4

Question 11

Silicon dioxide, SiO2, is the major component of sand. it's considered to be a compound because

Accepted Answer

it consists of two different elements.

Question 12

If some thing is acidic does it....

Accepted Answer

have a low PH

Question 13

According to the Rutherford model of the atom, most of the space that an atom takes up is

Accepted Answer

empty space

Question 14

Which of the following properties of sugar is not a physical property?

Accepted Answer

Sugar turns black when it is heated.

Question 15

what is a dinglehopper?

Accepted Answer

a fork

Questions 15