General Review
Name two reasons why compounds and mixtures are different?
Compounds are chemically bonded, in a fixed ratio, and not easily separated.
Mixtures are not chemically bonded, keep their individual properties, not in specific ratios, can be separated easily.
Anything that has mass and takes up space is _______?
matter
If you heat a liquid and it becomes a vapor what type of change is occuring? (state of matter)
physical change
What is the formula for volume of a rectangular prism?
V = L x W x H
Volume = length x width x height
What happens when an object with a density of 1.5 g/cm^3 is placed in water?
It will sink.
Measurement of how much matter is contained in a given space/volume
density
explosion of fireworks (combustibility)- chemical or physical?
chemical
What instrument do you use to get length?
a metric ruler
Atoms are the basic particle of an element.
True!
An object has a mass of 50g and a volume of 10 cm^3. What is the object's density?
5 g/cm^3
Texture, color, or hardness
NaCl
compound
What is the formula for density?
D = M / V
Density = Mass divided by Volume
The force that holds two atoms together?
chemical bond or bond
An object has a mass of 144 g and a size of 2 cm * 2 cm * 3 cm. What is the object's density?
12 g/cm^3
shattering a window
physical change
What is the recipe or the elements and the number of atoms in a compound?
the chemical formula
How do you find the volume of an irregularly shaped solid?
1. Fill a graduated cylinder with a liquid and use the meniscus to record the volume of the liquid by itself.
2. Add the irregularly shaped solid to the graduated cylinder and find the new volume using the meniscus.
3. Subtract the volume of the liquid by itself from the volume of the liquid and the irregularly shaped solid to get the volume of the solid.
4. Add proper unit of cm^3
If an object's mass is 35g and its volume is 5mL was is the total density? (A) and what would happen to the density if I increased the volume (B)?
density = 7 g/mL
Density would decrease: the amount of space for the same amount of mass would increase causing the object to become less packed or dense.
Rust or tarnish
Chemical property
O 2
Oxygen is a molecule not a compound.
True or False?
When you observe a physical property, there is a change in the substance.
False! Physical properties do not change a substance but chemical properties do change the substance!