34 terms

Science 9: Chemistry

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What is matter?
Any substance or any object that has a mass and volume
What is mass?
The amount of matter in a substance or object
What is volume?
The amount of space that a substance or object takes up
What is density?
The amount of mass in a certain volume of a substance or object
What is the density formula?
Density = Mass / Volume
What is state?
Weather something is a solid, a liquid or a gas
What is conductivity?
How easily something lets electricity or heat move through it
What is the boiling point?
The temperature at which a substance changes stare for a liquid to a gas
What is the melting point?
The temperature at which a substance changes state from a solid to a liquid.
What is an element?
A pure substance whose particles cannot be broken down further and still keep their original properties
What is Kinetic energy?
Energy of movement
What does the Kinetic Molecular Theory state?
All matter is made up of tiny particles, there is empty space between the particles, particles of matter are always moving and the more energy the particles have, the faster they can move and the further apart they can get
What does the Kinetic Molecular Theory describe?
What happens to the particles of matter during a change of state
Describe a solid
Particles and very close, fixed position and vibrate
Describe a liquid
All particles are still close, but have enough room to slide past one another
Describe a gas
All particles have high energy and move freely, adding heat gives particles more energy making it spread out faster and farther
What is a compound?
A pure substance that is made up of one or more types of atoms that are joined together due to a chemical change.
What are three examples of compounds?
Water, sugar and table salt
What is an ionic compound?
When a compound gains electrons from another atom or loose electrons to other atoms
What do ionic compounds usually form between?
Metals and Non-metals
What is an ionic lattice?
A repeating pattern of positive and negative ions in a compound
What are covalent compounds?
When Non-metal atoms bond together sharing their electrons to be neutral.
What is a molecule?
A neutral particle that is made up of atoms that are joined together by covalent bonds
What is a polyatomic ion?
An ion that is made up of two or more atoms that are held together with covalent bonds
What does the chemical formula include?
An ionic compound included symbols that identify each ion of the compound.
What is a physical change?
A substance changes in form but not in its chemical compostition
What are some examples of physical changes?
Ice melting, grass is cut, a raft is deflated, a piece of wire is bent
What is a chemical change?
A change that causes one or more new substance to be formed
What are some examples of chemical changes?
Burning paper, spoiling milk, growing, burning coal
How can you tell if a change is chemical?
Heat is produced or absorbed, one or both reactants are used up, there is a change in colour, gas bubbles in a liquid, a solid forms in a liquid, light is given off
What is the process of exothermic?
Energy is being released
What are some examples of exothermic changes?
Water freezing, iron rusting and natural gas burning
What is the process of endothermic?
Energy is being absorbed
What are some examples of endothermic changes?
Cooking an egg, baking bread and ice melting