pure substances

Question 1

What are the 2 classifications of matter?

Answer 1

Pure Substances and Mixtures

Question 2

Pure Substances have 2 different categories, name both

Answer 2

Elements and Compounds

Question 3

Matter with a composition that is always the same

Answer 3

Pure Substances

Question 4

Consists of 1 type of atom

Answer 4

Elements

Question 5

What are the differences of elements and compounds?

Answer 5

Elements have only 1 atom while compounds can have 2 or more elements. Compounds can be bonded chemically and they can be separated as well, but for elements, they cannot be physically or chemically separated due to it only having 1 atom.

Question 6

Composed of 2 or more elements

Answer 6

Compounds

Question 7

They are good conductors of electricity and heat and these are shiny in appearance. They are strong and hard, malleable and ductile and sonorous

Answer 7

Metals

Question 8

Where can we find elements?

Answer 8

Periodic Table

Question 9

Is water an element or a compound? Elaborate and explain your answer.

Answer 9

Water is a compound since it is chemically combined with hydrogen and oxygen. Water doesn’t have its own element so we say that it is a compound substance. The chemical formula of water is H2O

Question 10

They are bad conductors of electricity and heat they are dull in appearance. They are usually weak soft and brittle and are non-sonorous

Answer 10

Non-Metals

Question 11

Name 1 characteristic of a Pure Substance

Answer 11

1- Fixed composition
2- Distinct properties
3- Cannot be separated into simpler substances by physical methods
4- Can only be changed in identity and properties by chemical methods
5- Properties do not vary from one sample to another

Question 12

True or False? CO2 is a compound substance

Answer 12

True. It is because CO2 is carbon dioxide which has the elements, carbon and oxygen.