What are liquids, solid and gases?
What is matter?
Matter is anything that has mass and takes up space
What is temperature?
Temperature is a measure of the energy of motion in the particles in matter.
What is physical change?
Physical change is a change that doesn't affect the identity of matter.
What is a mixture?
A mixture is a combination of 2 or more substances that keep their identities.
What dissolves faster: salt in hot water, or salt in cold water?
Salt in hot water. At higher temperatures, the water has more energy therefore, it can break up the salt and spread its particles more quickly. So the speed increases as the temperature increases.
what is volume?
Volume is the amount of space that something takes up.
What is melting?
Melting is when a solid changes into a liquid because of a rise in temperature.
What is chemical change?
Chemical change is a change in the identity of matter. In a chemical change, a new substance is created.
What is a solution?
A solution is a mixture that has the same composition throughout.
What is density and how do you use it to separate mixtures?
Density is the amount of matter in a substance. Denser substances are heavier and stay below lighter, less dense substances.
What is a solid?
A solid is a substance with a definite shape and volume.
What is condensation?
What is conservation of mass?
It is a law that says that matter can be change into a new form, but cannot be created nor destroyed.
What is dissolving?
It is when one substance breaks down into particles too small to see. When one substance dissolves into another substance, the new substance is a solution.
Is a solution a physical or a chemical change?
It is a physical change. The substances each keep their identities within the solution.
What is a liquid?
A liquid is a substance that has a definite volume but does not have a definite shape.
Freezing is when a liquid changes to a solid because of a change in temperature. (Its temperature goes down).
What are examples of physical properties?
Examples of physical properties are color, shape, texture, melting or boiling points.
What are the physical properties that are used to separate mixtures?
Some physical properties used to separate mixtures are: size and color, melting and boiling points, density, magnetism, and the ability to dissolve (also called solubility)
In addition to temperature, what else affects the speed of dissolving?
Particle size. For example, coarse sugar or salt will take longer to dissolve than fine sugar or salt.
What is a gas?
A gas is a substance that does not have a definite shape or volume.
What are the freezing and melting points of water?
Freezing and melting points of water are the same: 0º C. (The same way that condensation and boiling points of water are the same: 100º C).
What is a chemical reaction?
It is a process in which new substances are formed during a chemical change.
Name one way to separate a solution?
Evaporation is a way to separate a solution. In evaporation, the liquid particles leave the solution and the dissolved particles stay behind.
Does stirring make a substance dissolve faster or slower.
Stirring make a substance dissolve faster.