A pure substance that cannot be separated into simpler substances by physical or chemical means
100
What is a compound?
A pure substance composed of 2 or more elements that are chemically combined
100
What is a mixture?
Combination of 2 or more substances that are not chemically combined
100
What is a solution?
A mixture that appears to be a single substance
100
What is a colloid?
a mixture that has properties of both solutions and suspensions. the particles are dispersed throughout but are not heavy enough to settle out.
200
List two unique set of properties elements can be identified by
physical-boiling point, melting point, density, color, hardness
chemical- reactivity with acid or oxygen, flammability
200
Compounds have properties that differ from those of the elements that form it. True or False
True
200
Solutions, suspensions and colloids are all types of mixtures. True or False
True
200
Give three examples of things that are soluble in water
salt, sugar, kool-aid
200
What is a suspension?
A mixture in which particles of a material are more or less evenly dispersed throughout a liquid or gas. The particles are heavy so eventually they settle down.
300
What is the name of the table that lists all of the elements?
the periodic table
300
How can compounds be broken down?
example- if you have NaCl, how can we separate the sodium from the chlorine?
through chemical changes. sometimes, energy is needed for a chemical change to happen
300
Describe three ways in which we can separate mixtures
distillation, centrifuge, evaporation, filtration
300
What is a solute? What is a solvent?
solute- substance that is being dissolved
solvent- substance in which the solute is dissolved
300
give an example of a suspension
snow globe
400
What is the symbol of the following elements:
-Oxygen
-Hydrogen
- Carbon
-Chlorine
- Aluminum
- O
- H
- C
- Cl
- Al
400
Name the elements in the following compound and state how many atoms the compound has:
CaCO3
- Calcium
- Carbon
- Oxygen
5 atoms
400
Give an example of a mixture, a solution, a colloid and a suspension
pizza, salt and water, mayonnaise, snow globe
400
Name the solute and the solvent in lemonade:
water:
lemon juice:
sugar:
- solvent
- solute
- solute
400
give three examples of a colloid
mayonnaise, shaving cream, jello, whip cream
500
Name the names of the following symbols:
- Mg
- Li
- N
- He
- Ni
Write the chemical formula for magnesium sulfate that is made up of one atom of magnesium, one atom of sulphur and four atoms of oxygen
MgSO4
500
How can you separate a mixture of salt, pepper and pebbles?
1- use a strainer to get the pebbles
2- add water to the resulting salt and pepper
3- pass the solution through a filter and get the pepper
4- evaporate the water and get the salt
500
Which one has a higher concentration:
a) 100 mL of water + 100 g of sugar
b) 50 mL of water + 100 g of sugar
b
500
What is the difference between a colloid and a suspension?
The particles in a colloid are dispersed throughout but are not heavy enough to settle out. The particles in a suspension, however, are more or less evenly dispersed throughout the liquid or gas but eventually settle down