TRUE/FALSE
The mass of a piece of paper changes when it is folded into different shapes.
*DAILY DOUBLE* __________ is a measure of how closely packed an object's particles are.
Density
*DAILY DOUBLE* What happens when heat is added to a solid? (be specific)
The particles start to move more quickly and the solid changes to a liquid. This is called melting.
Would sugar dissolve more quickly in hot tea or iced tea? Why?
Hot tea, because solubility increase as temperature of the solvent increases.
True or False: If the density of an object is less than the fluid it is placed in, it will sink.
False (It will float.)
*DAILY DOUBLE* The amount of space an object takes up is its density.
False (volume)
A salad dressing that you should shake before using is called a _____________.
suspension
What is another name for a homogeneous mixture?
Solution
*DAILY DOUBLE* Trail mix is an example of what kind of mixture?
Heterogeneous mixture
The process by which metals react with gases in the air is called ________________.
corrosion
With most matter, changing the mass also changes the volume.
True
*DAILY DOUBLE* When a gas loses energy, its particles slow down and move closer together. They cling together and slide by each other. A liquid forms in a process called ________.
condensation
*DAILY DOUBLE* What is a colloid? Give an example.
A heterogeneous mixture in which the parts are so small that they do not settle out. Ex. fog, smoke, mayonnaise, colored glass.
What are the two parts of a solution called? Which one is present in the greatest amount?
Solvent and solute. The solvent is present in the greatest amount.
What is a solution of a metal and another solid called?
An alloy.
Wood, glass and plastic are not good electrical insulators.
False
A ________ mixture has uniform composition and properties throughout.
homogeneous
How are some ways the parts of a homogeneous mixture can be separated?
Picking out the parts by hand, melting a solid, or boiling off a liquid, magnetism, filtering, buoyancy. It depends on the properties of the mixture.
*DAILY DOUBLE* Fill in the blanks. Solubility ________ as temperatures of the solvent _________.
increases, increases
Give 10 examples of physical properties of matter.
Mass, weight, volume, density, buoyancy, solubility, conductivity, flexibility, elasticity, color, shape, hardness, magnetism, reflectivity, texture
When matter changes from one state to another, a chemical change occurs.
False (a physical change occurs)
A _____ ______ is a material that transfers heat or electricity easily. Give 3 examples.
thermal conductor (copper, gold, iron, silver)
What is the solid formed from the chemical reaction that takes place within a solution?
precipitate
What is happening when substances bond together in new ways to produce something different from the original substances?
a chemical change
Fill in the blanks with the appropriate words: ____ ____ is a solute in air. ____ ____is the solvent. When water vapor condenses, ______ form.
Water vapor, Nitrogen gas, clouds