science quiz 10/24
What are some examples of physical properties of matter?
color, appearance, density, melting point, boiling point.
Compounds (matter)
Pure Substances made up of 2 or more elements that are chemically combined. *different from the elements they are made from *chemicals formulas used to represent them EXAMPLE: Carbon Dioxide
Mixtures (matter)
Substances made up of two or more elements or compounds that are physically combined. *Individual substances keep their separate properties. EXAMPLE: Orange Juice
What are examples of pure substances?
Table Salt Table Sugar Baking Soda Water
What is Chemistry?
Chemistry is the study of the properties of matter and how matter changes.
How would you describe a chemical property of matter?
A chemical property is a characteristic of pure substance that describes its ability to change into different substances.
Homogeneous (Mixtures)
A mixture of substances that are so evenly combined that you cannot see the different parts. EXAMPLE: SMOOTHIE
Heterogeneous (Mixtures)
A mixture that has 2 or more distinctly different parts that are easily observed. EXAMPLE: SALAD
How would you describe a physical property of matter?
A physical property is a characteristic of a pure substance that can be observed without changing into another substance.
What is a Pure Substance?
A pure substance is a single kind of matter that is pure, meaning it always has a specific makeup- or composition- and a specific set of properties.
Density
Density is the amount of matter in a given space or volume. D=mass divided by volume or D=m/v Density of water is 1g/mL or 1g/cm3 EXAMPLE: A brick has a mass of 100g and a volume of 25cm3. What is the density of the brick? D=m/v D=100g/25cm3 D=4g/cm3
Using the formulas for mass, volume, and density
How to solve a word problem: 1. Read the word problem carefully. 2.Determine what is being asked for. 3. Write the formula and plug in the known values. 4. Calculate and solve for the unknown value. 5. Write the answer and corresponding unit.
Mass
Mass is the amount of matter in an object. The amount of "stuff" is measured in grams. Mass=volume x Density EXAMPLE: The density of gold is 19.3 g/cm3. If I have a nugget with a volume of 10 cm3, what is the mass of cube? m=v x d m=10cm3 x 19.3 g/cm3 m=193 g
What is matter?
Matter is anything that has mass and takes up space.
Elements (Matter)
The simplest pure substances that cannot be broken down into any other substance. *composed of a single type of atom *symbols used to represent them ANYTHING ON THE PERIODIC TABLE
Volume
Volume is the amount of space an object takes up. We use cm3 or mL to measure volume. volume= mass divided by density liquid volume: 1mL Solid volume: 1 cm3 EXAMPLE: My paperweight has a mass of 50 g and a density of 2.5 g/cm3. How much space does it take up? V= m/d V= 50g/2.5g/cm3 V= 20 cm3
What are some examples of chemical properties of matter?
flammability, reactivity, different substance formed.
