Have you started your webassign? a) Yes b) No, haven’t started it c) opened it, but haven’t...
-
Upload
johnathan-park -
Category
Documents
-
view
215 -
download
1
Transcript of Have you started your webassign? a) Yes b) No, haven’t started it c) opened it, but haven’t...
• Have you started your webassign?
a) Yes
b) No, haven’t started it
c) opened it, but haven’t started
• How many protons are in lithium?
a) 1
b) 2
c) 3
d) 4
e) 7
• How many neutrons are in Be?
a) 2
b) 4
c) 5
d) 9
• How many electrons are in a neutral fluorine atom?
a) 9
b) 7
c) 17
d) 10
e) 19
Oxygen and nitrogen are in the same family
a) true
b) false
• Sodium is chemically similar to
a) lithium
b) magnesium
• How many energy levels does chlorine have?
a) zerob) onec) twod) threee) fourf) five
a. bottom, protons + neutrons
b. bottom, protons
c. top, protons + neutrons
d. top, protons
Atomic number is the _____ number and it tells how many ______.
An isotope is an atom with the same number of _______ but a different number of ________.
a. neutrons, protons
b. protons, neutrons
c. protons, electrons
d. electrons, protons
Nuclear reactions involve changes in an atom’s ___________ while chemical reactions involve changes with _________________.
a. nucleus, electrons
b. electrons, nucleus
The reason why atoms undergo radioactive decay is to become unstable.
a. True
b. False
• Calcium is in the ______ family
a. halogen
b. metalloids
c. alkaline earth metals
d. alkali metals
e. transition metals
• helium is in the ______ family
a. halogen
b. metalloids
c. alkaline earth metals
d. alkali metals
e. transition metals
• Lithium composes 53 grams of a 150 gram sample of LiBr. Calculate the percent by mass of lithium.
a. 53.0 %
b. 26.1 %
c. 2.8 %
d. 35.3 %
• What subatomic particle identifies the element?
a. proton
b. neutrons
c. electrons
• If magnesium composes 40% of a 300 gram sample of MgCl2, how many grams of magnesium is present?
a. 12,000 g
b. 120 g
c. 13 g
d. 12 g
Which of the following statements is truea. P+, n0, e- are all the same size
b. n0, e- are the same size
c. n0,P+ are the same size
d. P+, e- are the same size
e. P+, n0, e- are all different sizes
• The half life of francium is 22 minutes. How long would it take for a sample to decompose to 1/16 its original amount?
a. 22 minutesb. 44 minutesc. 66 minutesd. 88 minutese.110 minutesf. 132 minutes
• Classify the mixture: sweet tea
a. heterogeneous
b. homogeneous
• Classify the mixture: bag of Halloween candy
a. heterogeneous
b. homogeneous
• Calculate the average atomic mass:
cesium-133 75%
cesium-132 25%
a. 13275 amu
b. 132.50 amu
c. 132.75 amu
d. I have no idea how to do this
• What is the net charge of an atoms nucleus?
a. negative
b. neutral
c. positive
d. depends on the element
• What two particles are found within the nucleus?
a. neutrons and electronsb. neutrons and protonsc. protons and electronsd. nucleus and protonse. only protonsf. only neutrons
• Have you completed your log book?
a) Yes
b) No