States of matter
Mixtures
Crystals
Chemical and Physical changes
Acids and bases
100
What are the states of matter?
solid, liquid or gas
100
What is one way to increase dissolving?
Increase the temperature of the liquid
Stir the liquid
Shake the solid-liquid mixture
Increase the amount of liquid
Make the bits of solid smaller
100
What kind of crystals did we make in class?
borax
100
True or false:
Are chemical changes easily reversible?
False
100
What is this called?
pH scale
200
What state of matter has the following characteristics?
- not rigid
- no fixed shape
-fixed volume
liquid
200
If you can see multiple substances in a mixture is it homogenous or heterogenous?
heterogenous
200
What is surface tension?
is the film that forms on the surface of a liquid due to cohesion.
200
Baking a cake is a physical or chemical change?
Chemical
200
I have a pH of 3, I am an acid or a base?
acid
300
What characteristics do solids have?
- Rigid
- Fixed shape
-Fixed volume
300
Give me an example of a heterogenous mixture.
salad, paper clips and nails, oil and water
300
What is a crystal?
a crystal is a solid unit in which the molecules have been arranged in repeating patterns or networks
300
is cutting up a lemon a physical or chemical change?
physical
300
Something that is neither a base or an acid has a pH of what?
7
400
What is the process called when you go from a gas to a liquid?
Condensation
400
Give me an example of a homogenous mixture involving a solid and a liquid.
salt water, baking soda in water
400
What does saturated mean?
a solution that is unable to absorb or dissolve any more of a solute
BONUS POINT FOR 100
What is a solute?
400
What am I?
I am easily reversible and have no new products.
Physical change
400
Give me one characteristic of a base.
pH of 8 to 14
Feel slippery
Bitter in taste
Corrosive to metals
Change litmus paper blue
500
What process occurs when you go from a solid to a gas?
Sublimation
500
True or False: a solute is the substance being dissolved. Ex. the salt in salt water and a solvent is the substance doing the dissolving. Ex. the water in salt water
True
500
What is the process for making a homemade crystal?
Grab a jar, borax, strings, and a stick
Put boiling water into the jar
Add borax to the water and stir the mixture around until solution is saturated
Tie the string to the popsicle stick
Place popsicle stick over top of the jar and let the sting dangle in the water
Place jar on the ledge and wait for 24 hours
500
What are 3 pieces of evidence that mean that a chemical change occurred?
Change of odour
Bubbles are formed
Change of colour
Change in temperature or energy. Burning or cooking something
Change of molecule form. Ex. hydrogen + oxygen = water
Light, heat or sound is given off. Ex. fire works
Formation of a gas. Photosynthesis- CO2+ H2O —photosynthesis→ glucose and Oxygen
Formation of a precipitate. Ex. the reaction creates a solid.
The decomposition of matter. The breakdown of food.
500
What I am?
When you put blue litmus paper in me I stay blue. When you put red litmus paper in me, I turn blue.
Base