What's the matter?
What is the amount of space matter occupies called?
Volume
What is the difference between an intensive and extensive property?
Intensive-a property that is true regardless of the amount
Extensive-describes the amount of matter, numbers! A property that changes based on the amount/size
What is the difference between a physical and chemical change? What happens to its properties for both?
Physical- Changing something's form without changing what it is.
Chemical- Changing what it is, and therefore its properties!
What type of matter has a definite composition and cannot be separated by physical means?
Compound
How many significant figures are in 45.0?
3
What is the definition of matter? (2 things)
Anything that has mass and takes up space
Is density intensive or extensive? Why?
Intensive. No matter how much of it you have, the density remains the same
Is melting ice a physical or chemical change? Why?
Physical, it is still water!
Is salt water a pure substance or mixture? If a mixture, what type?
Write 0.00056 in scientific notation.
5.6 X 10-4
How are the particles arranged and moving in a solid, liquid, and gas?
Solid- vibrating in place
Liquid- moving but close together
Gas- moving crazily!
Which is extensive: density, temperature, or volume? Why are the others intensive?
Volume
Density and temp do not change based off of size
Is rusting iron a physical or chemical change?
Chemical, it is a chemical reaction with a new substance with new properties.
What is the difference between a homogeneous and heterogeneous mixture? Provide an example of each.
Homogenous- evenly mixed
Heterogenous- unevenly mixed
Convert 2.5 km to cm using dimensional analysis. Your answer needs to be in scientific notation. No calculator!
2.5 X 105 cm
A sample has a mass of 50 g and a volume of 10 mL. What is its density?
5 g/mL
Explain why density is intensive but mass is extensive.
Mass is about the amount matter, density does not matter the amount of matter, it is always the same density
A substance has a melting point of 80°C and reacts violently with oxygen. Which is a physical property and which is a chemical property? Why?
Chemical- reacts with oxygen
A sample contains only one type of atom, but the atoms are bonded together in groups of two. Is it an element, compound, homogeneous mixture, or heterogeneous mixture? Why?
Element
Calculate to the correct number of sig figs: 12.5 g + 3.42 g + 0.8 g. No calculator!
16.7g
Name the three common states of matter. Describe each. Which have a definite shape? Which have a definite volume?
Solid- definite shape and volume
Liquid- definite volume
Gas- neither
A sample is cut exactly in half. Which of these change: mass, volume, density, boiling point? Why?
A candle burns: the wax melts and the wax vapor reacts with oxygen. Identify one physical change and one chemical change. Why?
Wax melting- physical
Vapor reacting with oxygen- chemical
Explain how you would go about separating a mixture of salt water, rubbing alcohol, sand, iron fillings, and rocks. What types of methods do you use (what are the names)?
Filtration to filter out the rocks
Using a magnet to separate the iron fillings from the rest (physical properties)
Use distillation to separate the salt water from the rubbing alcohol
Use evaporation to separate the salt from the water
Calculate the answer with correct number of sig figs and in scientific notation: (4.00 × 10³) ÷ (2.0 × 10²). No calculator!
2.0 X 101