Vocabulary
Give an example of...
Fill in the blank
Short Answer
Questions
100
A substance with only one type of particle
pure substance
100
a compound
Examples:
- water
- salt
- vinegar
- baking soda
100
A ________________________ substance or material is made by people in order to imitate a natural substance or material.
synthetic
100
What are three ways to separate a mixture?
Examples:
- magnet
- centrifuge
- sieve
- filter
- evaporation
- pick out pieces
100
True or False.
An element can be separated into simpler substances.
False
200
A combination of two or more substances that are not chemically combined
mixture
200
a solution
Examples:
- salt water
- soda
- lemonade
- hot chocolate
200
If a spoonful of sugar is mixed in a glass of water, the sugar is the ___________.
solute
200
How many atoms of each element are present in the following compound?
NaHCO3
Na -
H -
C -
O -
NaHCO3
Na - 1
H - 1
C - 1
O - 3
200
What happens when you mix an acid and a base?
When you mix an acid and a base, they neutralize each other.
300
Define concentration.
The amount of solute dissolved in a solvent.
300
acids (three examples)
Examples:
- stomach acid
- lemon juice
- vinegar
- tomato
300
Acids taste ___________________, while bases taste _____________.
Acids taste sour, while bases taste bitter.
300
What are the three ways to speed up dissolving?
1. heat
2. mix
3. crush
300
A boron trichloride molecule has 1 boron (B) atom, 3 chlorine (Cl) atoms . What is the chemical formula for boron trichloride?
400
What is the pH scale for bases? (range)
8 - 14
400
a synthetic substance used in clothing
Examples:
- nylon
- rayon
- polyester
- acrylic
- fleece
400
The solution on the left is __________________.
The solution on the left is saturated.
400
What are three differences between compounds and mixtures?
Compounds:
- chemically combined
- separate chemically
- pure substance
Mixtures:
- physically combined
- separate physically
- not a pure substance
400
What is one con (negative) for using synthetic materials?
- hard to dispose (not biodegradable)
- clothes: easily melt and burn
500
What is a centrifuge?
A machine with a rapidly rotating container that applies centrifugal force to its contents, typically to separate fluids of different densities (e.g. cream from milk) or liquids from solids.
500
Law of Conservation of Mass
Examples:
- campfire/bonfire
- burning a candle
500
Compound, mixture or element?
A - a compound
B - a mixture of two elements
C - a mixture of a compound and an element
D - a compound
E - an element
F - an element
G - a mixture of two compounds
H - an element
I - a compound
500
Describe a procedure to separate a mixture of salt, finely ground pepper, and pebbles.
You can use a sieve to separate the pebbles first.
Then you can use a filter to separate the salt and the pepper.
500
What is one pro (positive reason) for using synthetic materials?
- durable
- less expensive
- more available