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PS2 Test

This stack is to help study for the PS2 Unit Test

QuestionAnswer
Density, color, odor, texture, and solubility are all examples of what kind of property? Physical property
How is chemistry related to matter? Chemistry is the study of matter and how it behaves or changes.
Why does an object sink or float? Its density
What is the formula for density? Mass divided by volume (m/v)
What is mass? The amount of matter (stuff) something is made of.
What is volume? The amount of space taken up by a substance.
What happens to particles (molecules/atoms) when heat is added to them? They move faster and spread out. They become less dense.
What happens to particles (molecules/atoms) when they get colder? They move slower and get closer together (denser).
What happens when warm water or air runs into cold water or air? The warm water or air rises, and the cold water or air sinks.
Why does warm air rise? It is less dense than colder air--its molecules are more spread out.
What type of property are boiling point, melting/freezing point? Physical property
What happens to the molecules of a substance when it freezes? They get closer together.
What happens to the molecules of a substance when it melts? They move faster and spread out. They also slide freely past each other.
What are the parts of an atom? proton, neutron, and electron
What are the charges of an atom's parts? Protons are positive. Neutrons are neutral. Electrons are negative.
An atom has parts that are charged. Why is the atom not charged? The positive parts (protons) equal the negative parts (electrons).
What parts of an atom are involved in a chemical change? Electrons--atoms share or give/take electrons with other atoms. This is what causes the chemical change.
What is a molecule? A group of two or more atoms.
What is a compound? A substance that is made of two or more elements.
What is an element? A substance made of only one kind of atom.
What does it tell you if carbon is number 6 on the periodic table of elements? It has 6 protons in its nucleus.
What is conductivity? The ability of elements to carry (transmit) heat or electricity.
What is easier to separate, a compound or a mixture? Why? Mixtures because their parts are not chemically bonded to each other.
What kind of a change is burning? Why? It is a chemical change because it creates a new substance.
What is a reactant? The original substances that are involved in a chemical reaction or change.
What is a product? The new substances that are created in a chemical change.
The chemical change in burning a candle can be written this way: Oxygen + Wax---------------------->Carbon Dioxide+Water What are the reactants in burning a candle? Oxygen and wax
The chemical change in burning a candle can be written this way: Oxygen + Wax---------------------->Carbon Dioxide+Water What are the products of a burning candle? Carbon Dioxide and Water
What are some signs of a chemical change? temperature change, release of light, odor change, new solid, new gas, fizzing/bubbling
What is the Law of Conservation of Matter? Matter cannot be created or destroyed.
If 52 oxygen atoms go into a chemical reaction, how many will come out? 52-the same number will always come out as what you started with.
Rusting can be written like this: Iron + Oxygen----------------------->Iron Oxide (rust) What are the reactants in this rusting process? Iron and Oxygen
Created by: gmcbride