Atoms
Atom Counting
Density
Energy
Changes & Reactions
100
This is the smallest part of an atom, located in the shell/cloud.
An electron.
100
Provide the element names and number of the atoms for each:
CO2
Carbon = 1
Oxygen = 2
100
What is the formula for calculating density?
Density = Mass / Volume
100
List three different forms of energy.
Possible answers:
Potential, Kinetic, Thermal, Mechanical, Light,
100
What are two examples of a physical change?
Phase change, cutting/folding something, mixing something --> no new substances created
200
This part of the atom contains both protons and neutrons.
The nucleus.
200
Provide the element names and number of the atoms for each:
Au₂O₃
Au -> Gold = 2
O -> Oxygen = 3
200
A 15 gram cube of potato has a volume of 3cm3; what is its density? Include units.
15g/3cm3=
5 g/cm3
200
How does adding energy to matter change its movement?
It increases its movement / higher kinetic energy.
200
What are three examples of an example of a chemical change?
Bubbles/fizzling, color change, odor change, fire, explosions, temperature change with no temp. input
300
The atomic number represents the total number of what in an atom?
Protons
300
Provide the element names + the number of atoms for each:
2AgNO₃
Ag -> Silver = 2
N -> Nitrogen = 2
O -> Oxygen = 6
300
What is the least dense liquid? What is the most dense?
Least: lamp oil
Most: honey
300
Describe how particles in a solid move.
The particles vibrate / move slowly in place.
300
If two chemicals are mixed and the product releases heat, what type of reaction is it?
Exothermic
400
True or false:
All gold atoms have the same number of protons in them.
True.
If protons change, the element changes.
400
Provide the element names and number of atoms for each:
YBa2Cu3O7
Y -> Yttrium: 1
Ba -> Barium: 2
Cu -> Copper: 3
O -> Oxygen: 7
400
Make a correct statement that compares milk's density to the density of water.
Options:
Milk is denser than water.
Milk is more dense than water.
Water is less dense than milk.
400
Finish the sentence:
Energy cannot be created or destroyed, only _______.
transformed / transferred
400
Identify the reactants and products of this chemical reaction:
H2O2 -> H2O + O2
Reactants: H2O2
Products: H2O + O2
500
Fill in the blanks:
______ ______ - ______ _________ = # of neutrons
Atomic Mass - Atomic Number = # of Neutrons
(remember to round # of neutrons)
500
Provide the element names + the number of atoms for each:
2BiFeO3
Bi -> Bismuth = 2
Fe -> Iron = 2
O -> Oxygen = 6
500
A mineral with the mass of 40 grams is dropped into a graduated cylinder with an initial volume of 50 mL. The graduated cylinder's volume increases 60 mL.
What is the density of the mineral? Show work and use units.
Change in volume -> 60 mL - 50 mL = 10 mL
Density = mass/volume
D = 40 grams / 10 mL = 4 g/mL
500
If particles collide at different energy levels, describe how the energy transfers.
Energy transfers from the higher energy particle to the lower energy particle.
500
Jenny mixed vinegar and baking soda together in a beaker. A quick, foamy solution formed that shot up to the top of the beaker. When the foam settled, she felt the beaker and it was colder than before.
What this a chemical or physical change, and if so, what is the evidence? What type of reaction is this?
Chemical change: Fizzy/bubble foam emerges, temperature change
Type of reaction: endothermic