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Midterm Study Guide

QuestionAnswer
What is the formula for density? Mass/Volume
How many weights does a triple beam balance consist of? Three
What is an atomic number? The number of protons in an atom
What are the elements on the periodic table increasing by? Atomic number
What are all the parts of an atom? Nucleus, Protons, Neutrons, and Electrons
What charge do protons have? Positive
What charge do neutrons have? Neutral
What charge to electrons have? Negative
In the chemical compound K1Si3 how many atoms of Silicon are there? 3
What is an isotope? An atom of the same element with the same number of protons but a different number of neutrons. It has the same atomic number but a different atomic mass.
When an atom gains electrons, the ions become __________ negatively charged
When an atom loses electrons, the ion becomes __________ positively charged
How are atoms arranged in solids? tightly packed
How are atoms arranged in liquids? close together, but still able to move
How are atoms arranged in gases? far apart
What is condensation? when a gas becomes a liquid
What is sublimation? when a sold becomes a gas
What is evaporation? when a liquid becomes a gas
What is a melting point? the point at which an element melts
What is a freezing point? the point at which an element freezes
What is a homogeneous mixture? a mixture that cannot be seen (lemonade)
What is a heterogeneous mixture? a mixture that can be seen (chex mix)
When a substance loses heat energy, the temperature __________ decreases
When a substance gain heat energy, the temperature __________ increases
What color does litmus paper turn when making contact with acid? red
What color does litmus paper turn when making contact with bases? blue
Endothermic reactions feel __________ cold
Exothermic reactions feel __________ hot
Bases are __________ than 7 on a pH scale. higher
Acids are __________ than 7 on a pH scale. lower
The neutral number on a pH scale is ____. 7
Formation of bubbles is result of a __________ ___________. chemical change
Cutting paper is an example of a __________ __________. physical change
Burning wood is an example of a __________ __________. chemical change
The 3 factors that increase reaction rate are: temperature, surface area, catalyst, and concentration
What is located on the left side of a chemical equation? reactants
What is located on the right side of a chemical equation? products
Created by: rylie.guerin