Answers are at the end!!
White Board Team Challenge #1
(Midterm Review: Basic Science Skills)
1) What is the last step to the scientific method?
2) An educated guess that explains a phenomena.
3) Which of the following is a qualitative observation?
a. 1.4m
b. forty miles
c. very short
4) Type of graph used to break something down into its parts.
5) Which axis does the dependent variable belong on? And what are the other two names for this
axis?
White Board Team Challenge #2
(Midterm Review: Basic Science Skills)
1) Term for predicting data on a graph that falls within the range of data collected/plotted.
2) How do you find the volume of:
a. A regular solid
b. An irregular solid
c. A liquid
3) What is the equation used to calculate density AND what is the density of water?
4) Which of the following is the largest unit of measurement?
a. meter
b. centimeter
c. decameter
d. decimeter
5) The variable in an experiment that the experimenter is in control of.
White Board Team Challenge #3
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
1)
2)
3)
4)
5)
Name the two categories for matter.
Type of mixture in which the particles are evenly spread out (uniform).
Basic building block of all matter.
State of matter that does not have a fixed shape nor volume and is charged.
Temperature is a measure of
White Board Team Challenge #4
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
1) On a heating or cooling curve, what is happening to the kinetic energy when the line becomes
flat/horzontal?
Increasing, decreasing, or staying the same
2) On a heating curve, what is the energy that is being added used for during the flat/horizontal
region on the graph?
3) What should you look for on a cooling curve to find the freezing point temp.?
4) What is happening to the intermolecular forces in a substance when it melts?
5) Which state of matter has the strongest intermolecular forces?
White Board Team Challenge #5
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
1) How does the thermal energy content of a glass of water at 50ºC compare to a large bucket of
water at 50ºC?
2) If a substance has very strong intermolecular forces, what can you predict about its boiling point?
3) If a substance evaporates very quickly, what can you predict about its intermolecular forces?
4) How does hydrogen bonding affect the intermolecular forces of a substance?
5) If a substance evaporates slowly, will the surroundings have a large change in temperature or a
small change in temperature?
White Board Team Challenge #6
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
1) Which of the following is/are physical changes?
a. Burning a candle
b. melting ice
c. dissolving salt
d. rusting iron
2) Which of the following is/are chemical properties
a. Flammable
b. reacts with sodium
c. tears easily
d. blue in color
3) Give the location in the atom for each of the following subatomic particles:
a. Proton
b. Electron
c. Neutron
4) Give the charge and the relative mass of each of the following subatomic particles:
a. Proton
b. Electron
c. Neutron
5) The mass of an atom is measured in what units?
White Board Team Challenge #7
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
1) Atoms with the same number of protons but a different number of neutrons are called________.
2) In a neutral atom (meaning it has no charge), the number of protons must equal the number of __.
3) This number is equal to the number of protons in an element.
4) How many neutrons are in an atom of Al-27?
5) How many electrons are in an atom of Mg-25?
White Board Team Challenge #8
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
1) Calculate the average atomic mass for the element “X” using the following information:
X-28 is found 92% of the time.
X-29 is found 5% of the time.
X-30 is found 3% of the time.
2) In an atom of Sn-118
a. How many neutrons are there?
b. How many protons are there?
c. How many electrons are there?
3) Write the nuclear symbol notation for Sn-118.
White Board Team Challenge #9
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
1) Calculate the molecular weight for the following:
a. C2H6O
b. Na2CO3
c. Ba3(PO4)2
2) If bromine exists in nature as Br-79 and Br-81, based upon its average atomic mass, which isotope
of bromine is more abundant in nature?
3) A substance dissolves in water. Therefore, is the substance:
a. Polar or nonpolar
b. Hydrophobic or hydrophilic
4) Draw the correct orientation for two water molecules (label the atoms, charges, covalent bond,
and hydrogen bond)
White Board Team Challenge #10
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
1) CH4 + 2O2  CO2 + H2O + energy
Is this reaction an example of an endothermic reaction, exothermic reaction or neither?
2) We make sure that all chemical reactions are balanced. Why must we balance chemical equations?
3) If you notice a decrease in temp. of the surroundings for a reaction, then is the reaction
endothermic, exothermic, or neither?
4) If a substance has more H3O+ ions than OH- , is the substance an acid, base, or neither?
5) What do we call an substance with a pH of 9? One with a pH of 2?
Answers!!
White Board Team Challenge #1
(Midterm Review: Basic Science Skills)
6) What is the last step to the scientific method? conclusion
7) An educated guess that explains a phenomena. hypothesis
8) Which of the following is a qualitative observation? C
a. 1.4m
b. forty miles
c. very short
9) Type of graph used to break something down into its parts. Pie/circle graph
10) Which axis does the dependent variable belong on? And what are the other two names for this
axis? Y-axis. Vertical axis, ordinate
White Board Team Challenge #2
(Midterm Review: Basic Science Skills)
6) Term for predicting data on a graph that falls within the range of data collected/plotted.
interpolate
7) How do you find the volume of:
a. A regular solid measure length, width, height, and multiply
b. An irregular solid water displacement
c. A liquid use a graduated cylinder
8) What is the equation used to calculate density AND what is the density of water?
Density= mass/volume.
1.0g/ml
9) Which of the following is the largest unit of measurement? c
a. meter
b. centimeter
c. decameter
d. decimeter
10) The variable in an experiment that the experimenter is in control of.
Independent variable
White Board Team Challenge #3
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
6) Name the two categories for matter. Pure substances and mixtures
7) Type of mixture in which the particles are evenly spread out (uniform). Solution or
homogeneous mixture
8) Basic building block of all matter. atom
9) State of matter that does not have a fixed shape nor volume and is charged. plasma
10) Temperature is a measure of
average kinetic energy of the substance
White Board Team Challenge #4
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
6) On a heating or cooling curve, what is happening to the kinetic energy when the line becomes
flat/horzontal?
Increasing, decreasing, or staying the same
staying the same
7) On a heating curve, what is the energy that is being added used for during the flat/horizontal
region on the graph? To move the particles apart; cause a change in state
8) What should you look for on a cooling curve to find the freezing point temp.? flat, horizontal
region
9) What is happening to the intermolecular forces in a substance when it melts? Getting weaker
10) Which state of matter has the strongest intermolecular forces? solid
White Board Team Challenge #5
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
6) How does the thermal energy content of a glass of water at 50ºC compare to a large bucket of
water at 50ºC? bucket has more
7) If a substance has very strong intermolecular forces, what can you predict about its boiling point?
High boiling point
8) If a substance evaporates very quickly, what can you predict about its intermolecular forces?
They are weak
9) How does hydrogen bonding affect the intermolecular forces of a substance? Makes them
stronger
10) If a substance evaporates slowly, will the surroundings have a large change in temperature or a
small change in temperature? small
White Board Team Challenge #6
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
6) Which of the following is/are physical changes? B, C
a. Burning a candle
b. melting ice
c. dissolving salt
d. rusting iron
7) Which of the following is/are chemical properties A, B
a. Flammable
b. reacts with sodium
c. tears easily
d. blue in color
8) Give the location in the atom for each of the following subatomic particles:
a. Proton in the nucleus
b. Electron outside the nucleus in clouds
c. Neutron in the nucleus
9) Give the charge and the relative mass of each of the following subatomic particles:
a. Proton +1, 1
b. Electron -1, 0 (compared to protons and neutrons)
c. Neutron neutral, 1
10) The mass of an atom is measured in what units? amu
White Board Team Challenge #7
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
6) Atoms with the same number of protons but a different number of neutrons are called________.
isotopes
7) In a neutral atom (meaning it has no charge), the number of protons must equal the number of __.
electrons
8) This number is equal to the number of protons in an element. Atomic number
9) How many neutrons are in an atom of Al-27? 14
10) How many electrons are in an atom of Mg-25? 12
White Board Team Challenge #8
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
4) Calculate the average atomic mass for the element “X” using the following information:
X-28 is found 92% of the time.
X-29 is found 5% of the time.
X-30 is found 3% of the time.
28.11 amu
5) In an atom of Sn-118
a. How many neutrons are there?
b. How many protons are there?
c. How many electrons are there?
68
50
50
6) Write the nuclear symbol notation for Sn-118.
118Sn
50
White Board Team Challenge #9
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
5) Calculate the molecular weight for the following:
a. C2H6O
b. Na2CO3
c. Ba3(PO4)2
46 amu
106 amu
601.9 amu
6) If bromine exists in nature as Br-79 and Br-81, based upon its average atomic mass, which isotope
of bromine is more abundant in nature? Br-79
7) A substance dissolves in water. Therefore, is the substance:
a. Polar or nonpolar
polar
b. Hydrophobic or hydrophilic
hydrophillic
8) Draw the correct orientation for two water molecules (label the atoms, charges, covalent bond,
and hydrogen bond) Look on your Water Lab
White Board Team Challenge #10
(Midterm Review: Chemistry)
Do NOT Write on This Sheet!
6) CH4 + 2O2  CO2 + H2O + energy
Is this reaction an example of an endothermic reaction, exothermic reaction or neither?
exothermic
7) We make sure that all chemical reactions are balanced. Why must we balance chemical equations?
Law of conservation of mass
8) If you notice a decrease in temp. of the surroundings for a reaction, then is the reaction
endothermic, exothermic, or neither? endothermic
9) If a substance has more H3O+ ions than OH- , is the substance an acid, base, or neither? Acid
10) What do we call an substance with a pH of 9? One with a pH of 2? Base, acid