. Matter and its properties, what are some ways to describe matter?, Physical changes and chemical changes, and data.

grade 8 science quiz.

What is matter?

Matter is anything that has mass and takes up space.(volume)

What does all matter have in common?

Space and volume

What is mass?

the amount of matter in an object or sample.

What are the 3 units for measuring mass?

Kilograms, grams, milligrams,

what is volume?

the amount of space that a material takes up

What are the units for measuring volume?

cubic meters, cubic centimetres, gas or liquid litres, or millilitres,

How is matter described?

it can be described based on its chemical properties and physical properties.

What are physical properties?

characteristics of matter that can be observed or measured without changing its chemical identity.

What are 7 examples of physical properties?

Melting point, boiling point, malleability, hardness, solubility, viscosity, density.

What is a melting point.

the temperature at which a substance changes from solids to liquid.

What is a boiling point?

the temperature at which a substance changes from liquid to a gaseous state.

What is malleability?

describes how easily a substance can be hammered or bent into different shapes.

What is hardness?

describes the resistance of a solid to being scratched or dented.

What is solubility?

describes the ability of a substance to dissolve in a solvent.

What is viscosity?

describes how quickly a substance flows in liquid form,

What is density?

quantity of mass in a certain volume of material.

What are chemical properties?

the ability of matter to react with another substance to form one or more new substances.

How can it be observed?

can only be observed when a substance chemically interacts with another substance.

What are 4 examples of chemical proberties?

reactivity with acids, reactivity with oxygen, toxicity, solubility.

What is physical change?

the change of matter that does not change it’s chemical identity or composition.

What are 2 examples of physical change?

freezing, and cutting.

What is freezing?

when water with is a liquid, forms into ice which is a solid.

What is the equation for freezing?

Liquid water (H2O)→solid water (H2O)

What is cutting?

cutting something into small pieces

What is chemical change?

change of matter that produces one or more products, when a new chemical substance is created.

What are 2 examples of chemical change?

2H+O→H2O (formation of water), and toasting bread.

How is toasting bread an example of chemical change?

evidence of new substance forming:colour..and smell of bread change when you toast it.

How do you know when a new chemical is formed?

• a new substance of material appears.

• Emission, sound or light are given off.

• Bubbles of gas formed.

• A solid material appears when two liquids are mixed (a precipitate)

What are the two different types of data?

Qualitative data bad Quantitative data.

What is qualitative data?

can be observed and compared using words (subjective)

What are 4 examples of qualitative data?

Sight, door, texture, state.

What is Quantitative data?

can be measured and recored by suing numbers (objective)

What are 3 examples of Quantitative data?

• There are 8 dolphins in this pod.

• The boiling point of water is 108

• The dolphin is 1.45m in length.

What can matter be classified as?

a mixture or a pure substance.

What is a mixture?

can be separated into parts by physical changes.

What is 2 example of a mixture?

salt water and trail mix.

What is a pure substance?

are elements or compounds.

What are elements?

cannot be separated or broken down by physical or by chemical changes.

What are compounds?

can be broken into 2 or more elements by chemical changes but bit by physical changes.

What is an example of a pure substance?

H2O→ 2H+O