Atomic Structure
What subatomic particle determines the identity of an element?
Protons
What are the starting substances in a chemical reaction called?
Reactants
How many valence electrons does Oxygen have?
6 Valence Electrons
What is the difference between speed and velocity?
Velocity includes direction
Which wave has more energy?
A short wavelength or a long wavelength?
Short wavelength (High frequency)
Lithium-7
How many protons, neutrons, and electrons are in this atom?
3p, 4n, 3e
What law states that matter cannot be created or destroyed during a chemical reaction?
Law of Conservation of Mass
Is CO2 ionic or covalent? Explain why.
Covalent because both C and O are non-metals
A car changes direction while keeping the same speed. Is the car accelerating, yes or no? Explain.
Yes. Any change in speed or direction = acceleration
Draw the electromagnetic spectrum from lowest energy to highest energy.
Radio, Micro, Infared, Visible, UV, X-Ray, Gamma
An atom has 17 protons, 18 electrons, and 18 neutrons.
1. Identify the element
2. Write the name using correct isotope and/or ion notation.
Cl -1
Chlorine-35
2H2 + O2 --> 2H2O
Synthesis Reaction
Which compound below will most likely form an ionic bond?
1. CO2
2. H2O
3. MgCl2
4. CH4
MgCl2
Two students run the same distance in the same amount of time. Student A runs north while Student B runs south.
1. Yes, same speed
2. No, different velocity
3. Velocity includes direction, and they moved in opposite directions.
One wave has a frequency of 15Hz and one has a frequency of 5Hz. Which has more energy and why?
Calculate the number of neutrons in the isotope:
Carbon-14
8 neutrons
Balance the equation:
___Fe + ___O2 --> ___Fe2O3
4Fe + 3O2 --> 2Fe2O3
Identify the compound that has the strongest bonds
1. CH4
2. CO2
3. MgO
4. N2
N2
A runner travels 120m in 15s. What is their speed?
8m/s
A wave has a wavelength of 2 meters, while another wave has a wavelength of 10 meters.
1. 2 meter wave
2. 2 meter wave
An unknown atom has 15 protons, 16 neutrons, and 18 electrons
Identify:
1. The element
2. The mass number
3. Whether it is an ion
4. Its charge
1. Phosphorus
2. 31
3. Yes, its an ion
4. -3 charge
This reaction is most likely what kind of reaction?
Fe + CuCO3 --> ? + ?
Based on this information, predict the outcome of the equation.
Fe + CuCO3 --> Cu + FeCO3
Two students are arguing over how to draw the compound:
H2NCl
One student puts Cl in the center because it has more valence electrons. One student chooses N.
Who is correct? Draw the correct Lewis Structure for the compound.
N in center
A ball starts at rest and accelerates west at 4m/s2 for 6 seconds. What is its final velocity?
24m/s west
Explain why gamma rays are more dangerous than radio waves using wavelength, frequency, and energy
Gamma rays have a higher frequency and therefore a shorter wavelength. Because it has a higher frequency, there is high energy.