January 19 test Flashcards
What is matter? How can it be observed?
Everything in the universe is made up of matter. It can be observed with our 5 senses.
Give two properties of a liquid
- Particles can move/slide past one another.
- Forms a surface in its container
- Shape changed to fit the shape
You are given a ring. How can you find out if it is pure gold? Explain your answer.
You can boil/melt the gold because all pure substance have a boiling/melting point.
Why would filtered water be considered a pure substance, but ocean water be considered a mixture?
Because filter water filters out the extra mineral from the ocean. Like salt, sand etc. but water itself is a pure substance
What is the difference between a physical and chemical change. Give an example each.
Physical changes; materials change it’s shape or state but it keeps it’s IDENTITY. No new substance. Materials will be the same as it started with, even if it looks different. Ex. Rip paper apart. Turn water to ice.
Chemical change: one type of matter changes to PRODUCE ONE OR MORE DIFFERENT TYPES OF MATTER. The term chemical property refers to the ability of a material to take part in a chemical change. Ex. Tree into paper, or egg sugar flour milk bakes to cake.
What’s the difference between a qualitative and a quantitative property of matter? Give example of both.
Qualitative: properties you can sense or described.
Quantitative: properties you can count or measure with number.
Ex. Cup of water etc.
Difference between heterogenous mixture and a homogenous mixture. Give two examples each.
Heterogenous-different throughout
Ex. Cereal with raisins, pizza,pulpy orange juice
Homogenous same throughout
Ex. Gatorade, Apple juice, windex
2 properties of a gas
- Particles fills container completely
- Lots of space between particles. Particles move around freely and quickly.
- Shape changes to fit the shape of its container.
Define alloy and give an example
Solutions made from 2 or more metals. Aka. Metals made out of 2 or more elements. Ex. 18 karat gold ring
2 properties of solid
- does not change shape to fit container
- Lightly packed, vibrate but don’t move around
- Can NOT move past one another.
3 states of matter. Give an example of matter changing through all three states.
Gas, liquid, solid. Ex. Ice cube
Define element and compound. What is the difference between 2. Give an example of each
Element- pure substance composed of one type of atom WHICH CANNOT BE BROKEN DOWN or SEPERATED INTO SIMLAR SUBSTANCE. Ex. Iron, gold
Compound- a pure substance composed of 2 or more elements that have COMBINES IN A CHEMICAL CHANGE. ex. Water
What is a mechanical mixture. Give 3 examples.
A mixture made of more than one type of matter, in which the different parts can be easily seen. Ex. Pizza toppings, fruit salad, cereal with raisins.
Using the particle model of matter, explain what is happening when an ice cube melts.
When you add energy (heat) to the ice cube, it’s particles starts moving faster.
True or false, solutions are always heterogenous. Explain.
False, because solutions have to have the same throughout.
What’s the difference between a suspension and an emulsion. Give an example of each.
A suspension Is when it is easy to see the separation of the mixture and a emulsion is when a suspension had been added to allow the suspension the mixed.
Suspension ex. Oil and vinegar
Emulsion ex. Paint
Difference between a reversible and non reversible change?
A reversible change is that it can be undone a non reversible change is something it cannot be undone.
Define solvent and solute. Using kool aid as an example, what is the solvent and solute.
Solute- substance that dissolves aka kool aid powder part
Solvent- substance in which the solute dissolves aka water/liquid
What’s a pure substance?
Material that is the SAME THROUGHOUT and is composed of only ONE TYPE OF PARTICLE.
List 4 ideas of the particle idea model of matter.
- All matter is made up if particles that are much to small to be seen
2 have empty spaces between them
3 always in motion
4 higher temp moves faster than particles at lower temp
Pick an object and describe at least 2 qualitative and 2 quantitative properties
Cup with water- length, measure of water. Feels wet, tastes like water.
