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WorksheetsChem
Total questions: 25
Worksheet time: 13mins
What is VSEPR?
atom
theory that allows you to predict the shape and polarity of simple molecule
element
medicine
3-D shapes of molecules is Molecular geometry
True
False
Polarity: when a slight change in a positive or negative change occurs
True
False
Group: a row on the periodic table
True
False
What is the periodic table?
Group of elements that have poor properties of metals or nonmetals
Large group of elements that tend to be solids at room temperture
A table
Chemical elements are arranged in order of increasing atomic numbers
Who is Democritus
Greek philosopher stated that all matter was made of various basic elements
Lived in the early 1800's proposed the first accepted atomic theory
Scientist
Chemist
A neutron is positivly charged
True
False
A proton is negatively charged
True
False
What is small, dense, and a positively charged center of the atom that contains most of its mass
Mass
Density
Matter
Atom
Endothermic
A process in which the system releases heat into the surroundings
A process in which the system absorbs heat from the surroundings
Cold surrounds absorbing heat
Heat surrounds absorbing cold
A process in which the system releases heat into the surroundings
Exothermic
Thermochemistry
Endothermic
Biology
The study of how heat energy flows between a system and its suroundings
Chemistry
Thermochemistry
What is the density of aluminum
2.70
0.0133
8.69
13.5
Is an atom the smallest unit of an element?
True
False
Endothermic: releases energy, the phase change from gas to liquid to solid
True
False
What is chemistry?
The study of matter and the changes it undergoes
The study of molecules and atoms
The study of life
The study of compounds and elements
The amount of matter contained in a given amount of space; mass to volume ratio
Liquid
Solid
Gas
Density
What is an atom?
Consists of a dense, central nucleus containing protons and neutrons
Small dense positive charged center of atom that contains most of its mass
Electrons, protons, and neutrons
Particles in a valence shell
What is liquid/water?
The transfer of kinetic energy from a warmer object to a colder object
Has one of the highest specific heat capacities of any known subtance
A solid that melts into a liquid
Kinetic energy melted
Joule: The Sl unit for heat energy
True
False
How do metallic bonds work?
atoms overlap to form molecular orbitals
small energy levels crowded together
valence electrons held by an atom
metal bonded together
What is crystallization?
liquid in solution evaporated
solid crushed together and formed through heat
heat melted into different shapes
liquid solified
Physical changes are caused by motion, temperture, and pressure
True
False
What are some examples of compounds
Water
Hydrogen gas
Oxygen gas
Metals
What is the symbol of Gamma radiation?
0.1
1.0y
0/0y
00b
