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Test Guide

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