Chemistry Module 1

What is a property?

A characteristics useful for identifying substance or object properties

What substance or object properties include?

Size, colour, temperature, chemical composition, chemistry reactivity

What is chemical composition?

What the matter is made of

What is chemical reactivity

How the matter behaves (reactivity)

What is the difference between chemical and physical change

Physical: A change that doesn’t affect what the substance is made of. Other words: A change that does not affect chemical makeup substances or object. Chemical: A change in the chemical makeup of a substance. A change that changes what the substance is made off.

Is sugar dissolving in water chemical or physical change?

It is physical. Sugar and water does not change its substance. As water can be removed by evaporation and sugar can rediscovered its original form.

Is sugar heated in a saucepan to make caramel chemical or physical change?

Chemical because when sugar is heated its substance thickens and colour darkens. Occurring that a new formed substance had been made.

What are the three forms of matter

Solid, Liquid, Gas

What is solid?

A substance that can hold its shape and has definite volume

What is a liquid

A substance that has definite volume but assume its shape of its container.

What is Gas?

A substance does has neither shape or volume

States of matter?

The physical state of a substance as a solid, liquid, or a gas

Change of state

The conversion of a substance from one state to another for example liquid to gas or solid to liquid

What is usually the Fahrenheit scale of a room temperature?

78 F

Define formaldehyde

It is a disinfectant, a preservative and a raw material for the manufacturing of plastics.

What are the melting point and boiling point of formaldehyde

92 C melting point and 19.5 C boilinh

Is the formaldehyde a gas, liquid, or solide

It is a gas

Define pure substance?

A substance that is the same all the way through

Define mixture

Mixture is a substance filled with two or more substances that creates a new form of chemical identity.

Define homogeneous

A uniform mixture that has the same composition and never change

Define heterogeneous

A non uniform that has regions of different composition

How many groups can pure substance be classified?

Two

Define element

A fundamental substance that cannot be broken down chemically into any simpler substance.

Example of an element?

Gold, silver, copper

Define chemical compound

A pure substance that can be broken down into simpler substance by chemical reaction

Example of a chemical compound

Water, Sodium chloride, Carbon dioxide

Homogeneous mixture example

Salt, water, coffee

Heterogeneous Mixture

Chocolate chips, Cookies, Pot pie

Pure substance chemical compound example

Water, sugar, tabls salt

Pure substance element examples

Oxygen, gold, sulfure

Is vanilla ice cream pure substance or mixture? Heterogeneous or homogeneous

Mixture and homogeneous