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Test Guide
| Question | Answer |
|---|---|
| What are 3 physical properties of metals? | Solid at room temperature. Good conductors of heat. Malleable and ductile. |
| Metalloids conduct heat very well. True or False | False |
| How many electrons can be in the first electron cloud? | 2 |
| What are the electrons called on the outer layer? | valence electrons. |
| What is the difference between homogeneous and heterogenous mixtures? | same mixture and different mixture |
| What charge do electrons have? | negative charge. |
| What does the atomic number represent? | Protons and electrons |
| Is density physical or chemical? | physical |
| Is rust chemical or physical change? | chemical due to the oxygen reacting with the metal. |
| What are physical and chemical changes? | Change in physical appearance or states: solid, liquid glass. No chemical bonds have been broke. |
| What is the physical and chemical properties of argon? | physical properties include: low melting points, found in a gaseous state at room temperature, tend to be odorless and colorless. chemical properties: are stable, do not react, they have 8 valence electrons making them happy and not wanting to react. |
| What parts make up an atom? | Neutrons and protons in a nucleus and electrons in an orbital motion around the nucleus. |
| What charge does a proton, neutron, and electron have? | positive, neutral, negative |
| Is frying an egg a physical or chemical reaction? | It depends. Physical if you say it is still an egg. An egg is an egg. Chemical- proteins in the egg denature or break their bonds to form other bonds. I would always say it is a chemical reaction. |
| How do you find the amount of neutrons in an atom? | Step 1: Round the atomic mass to a whole number Step 2: Whole atomic mass-atomic number= number of protons |
| What are the physical and chemical properties of metals? | physical properties: solids at room temperature, malleable, ductile, high melting points, good conductors of heat. Chemical properties: not stable, tend to give away their electrons, very reactive |
| What makes up the nucleus? | Protons and neutrons |
| What is the difference between an atom, compound, and a molecule? | atoms are made of protons, electrons and neutrons. A molecule is formed when two/ more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds. |
| What is atomic mass? | is the total mass of protons, neutrons, and electrons in a given element. |
| Which is more electronegative lithium or oxygen? | Lithium know the trend from the periodic table |
| What is the law of conservation of mass? | the mass of the products in a chemical reaction must equal the mass of the reactants |
| What are valence electrons? | The outermost electrons |
| What is an example of a physical and chemical property of nonmetal? | Physical properties: can exist in gases or solids at room temperature, dull, hard or brittle,poor conductors of heat, not malleable or ductile. Chemical properties: will share or gain electrons, are electronegative |
| Which atom is bigger helium or arsenic? | Arsenic. Know the trends for the atomic sizes. |
| What is density? | The amount of mass in an object |
| What is matter? | Anything that has mass or takes up space |
| What is the difference between weight and mass? | Mass- the amount of matter in object Weight- the amount of gravitational force on an object |
| If the density is greater than one what will happen to the object if placed in water? | It will sink |
Created by:
tythran
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