What is the most abundant element in the Earth's atmosphere?
Nitrogen
100
What does pH stand for?
Potential of Hydrogen
100
Draw the magic triangle for Density
D=M/V
100
What is the first step of a scientific investigation?
Ask a question
100
What is the second most abundant element in the Earth's atmosphere?
Oxygen
200
A neutral solution has a pH of ___________.
7
200
Which state of matter consists of particles that move freely so that the matter does not have definite volume?
liquid
200
This type of force is what causes objects to attract and repel each other
Gravitational force
200
Isotopes have different numbers of __________.
Neutrons
200
What subatomic particle has a positive charge and is found in the nucleus?
Proton
300
Write the chemical formula for Dinitrogen trioxide.
N2O3
300
In which type of reaction do ions in two compounds switch places?
double displacement reaction
300
What is activation energy?
the smallest amount of energy that molecules need to react. (example: striking a match)
300
What are the units for Density?
Liquid = g/mL
Solid = g/cm3
300
What is the charge of an ionic compound?
zero
400
What is the smallest particle into which an element can be divided and still be the same substance?
atom
400
Souring milk is an example of a ________________ change.
chemical
400
What occurs when water freezes?
A physical change
400
When two or more elements join together chemically, a ________________ is formed.
compound
400
The Periodic law states _________________.
Properties of elements change periodically with the elements' atomic number.
500
For Nitrogen, find the protons, neutrons, & electrons. Draw the Bohr's model and the Lewis dot structure.
Protons = 7
Electrons = 7
Neutrons = 7
Bohr = 2 in 1st energy level, 5 in 2nd energy level
Lewis Dot = 5 dots around N
500
What best way to measure the volume of an irregularly shaped solid is __________________. Explain your answer.
Water displacement. Find the mass of the object with a triple beam balance. In a graduated cylinder, put water and measure the initial volume. Place the object in the graduated cylinder, measure the final volume. Find the difference between the initial and final volume. Divide the mass by the difference in the volumes.
500
Describe the motion and arrangement of the particles in a solid, liquid, and gas.
Solid - orderly, packed together, vibrate in place
Liquid - slide by each other, some movement, not packed tightly together
Gas - Move quickly, no order
500
State Charles' Law and Boyle's Law.
Charles' Law = the volume of a gas is directly proportional to the temperature of a gas when pressure is constant
Boyle's Law = the volume of a gas is inversely proportional to the pressure of a gas when temperature is constant
500
What do we call a horizontal row on the periodic table? What do we call a vertical column on the periodic table?
Horizontal row = period
Vertical column = group or family