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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
- no new substance is produced - they - there can be Ma change in shape or state.	what are signs of a physical change
The object expands, the volume of the object increases. The higher the temp, the more the particles move.	What is expansion? What happens in the process?
The object decreases in volume. The lower the temp, the less the particles inside the objects move.	What is contraction?
(ask different changes)	changes of state diagram
Temp when bubbles of a gas form a liquid and it is said to boil	Define boiling point
a solid - called a solute is dissolved in a liquid - called a solvent to form a solution. e.g. salt in water	define mixing
- a new substance is formed - changes are not reversible - change in color, smell gas or see bubbles, can see a new substance called a precipitate - formed in a clear solution, observing that energy is produced or formed as heat or light. - when something changes color it is a chemical change	define chemical change
- when two solutions are mixed a new solid is produced e.g kidney stones - exothermic - light, energy, heat and sound exit - a chemical change produces energy and is described as exothermic e.g fireworks - endothermic absorb energy from surroundings e.g heat pack	Define precipitation
- all substances are made from tiny invisible particles - there are tiny spaces between particles - attracted to each other - always moving or vibrating hotter = more energy an move faster cooler= less energy and move slower	particle theory
- tightly packed so they have a fixed shape - particles in solids vibrate - strong forces - incompressible	Solids
- relatively - vibrate but can move around - take the shape of a container - incompressible - weaker forces	Liquids
- far apart - vibrate but can move - particles moving quickly - almost no forces	Gas
- evaporates easily to from a gas - when lid is taken off particles spread about - eventually particles are evenly spread	diffusion
- tiny particles - cannot be divided - building blocks of matter	Atoms
all are made of one type of atom - unique properties - P table shows all known elements - there are single atoms, molecules and lattice	Elements
- shiny - solid - conductors - malleable	metal
- Dull - Solid - dont conduct - brittle	non metal
electron - negative charge neutron - no charge proton - positive charge it goes a neutron in the middle then a proton and then the electron cloud	subatomic particle
chemical - C + O2 = CO2 word - carbon + oxygen = carbon dioxide	Chemical equations and word equations
chemical reaction involves burning with oxygen - sometimes explosion occurs	Combustion
- two or more atoms joined together - molecular compounds - compound lattices	Compounds
- naturally occurring substances - found in rocks and soil - dissolve in water can be found in water bodies	Minerals
- rocks that contain valuable minerals like iron or copper	Ores
- color test - flame color - Lustre - Streak	the tests
DENSITY IS NOT THE SAME AS WEIGHT - measured in grams per cubic centimeter - Solid - most dense - Liquid - less dense - Gas - least dense	Density
- most dense will sink - least dense will float	floating and sinking