Unit 1 Chem revision

What are the three states of matter?

Solid, liquid, and gas.

Fill in the blank: The process of changing from solid to liquid is called __________.

Melting

Fill in the blank: Gases have __________ shape or volume.

no fixed

What is the definition of diffusion?

Movement of particles from high to low concentration.

Brownian motion refers to __________.

Random movement of particles due to collisions with air or liquid molecules.

What are atoms?

Smallest unit of matter, made of protons, neutrons, and electrons.

Elements are __________ substances with only one type of atom.

pure

What is the relationship between compounds and elements?

Compounds are formed from two or more elements chemically bonded.

Fill in the blank: The mass number is the number of protons plus __________.

neutrons

What is the charge and mass of a proton?

Charge +1, mass 1.

Group 1 elements are known as __________.

Alkali Metals

What do Group 0 elements have that make them unreactive?

A full outer shell.

Fill in the blank: Non-metals are generally __________ conductors of electricity.

poor

What is metallic bonding?

Positive ions in a ‘sea’ of delocalized electrons.

Fill in the blank: Rusting occurs when iron reacts with __________ and oxygen.

water

What technique is used to separate insoluble solids from liquids?

Filtration.

In flame tests, lithium produces a __________ flame.

red

What happens to limewater when carbon dioxide is present?

It turns cloudy.

What tests are conducted for identifying metal ions?

Sodium hydroxide (NaOH) test.

What is the significance of the Rf value in paper chromatography?

It represents the ratio of distance traveled by a substance to distance traveled by solvent.