Which of the following is an example of chemical change?
a. Filling up a balloon with hot air
b. Taking a glass of water and freezing it by placing it in a freezer
c. A plant collecting sunlight and turning it into food
d. Your dog ripping up your homework
C
100
The atomic # of an element whose atoms have 9 protons and 10 neutrons is
9
100
Reactions between atoms involve only____.
Valence electons
100
What is the correct formula for dicarbon tetrahydride
C2H4
200
Write the scientific notation for 1036000
1.036 x 10^6
200
Which of the following is an example of a homogeneous mixture?
a. A mixture in which two or more substancs are still visible
b. A mixture in which large particles are suspended
c. A mixture in which two or more substances are evenly distributed
C
200
There are ___ electrons, ____ protons, and ____ neutrons in an atom of S--34
16, 16, 18
200
How many electrons are shared in a double bond?
4
200
What is the most electronegative element on the periodic table?
Fluorine
300
Write the standard notation for 1.50 x 10^-1
0.150
300
a substance that tends to be shiny, malleable, and a good conductor of electricity
metal
300
an atom has 12 protons, 12 electrons, and 13 neutrons. what is the identity and mass of this atom?
Mg--25
300
Draw the lewis dot structure for Al and O. Show correctly where electrons would move in an ionic bond and include charges in the diagram.
O-2 Al+3 O-2 Al+3 O-2
300
Draw the Lewis Dot Diagram for Helium
.
He.
400
Convert 378 cm to meter
3.78 meters
400
a compound that contains both cations and anions is called
an ionic compound
400
Order the following from GREATEST electronegativity to least ionization energy: S, O, Se, Te
O, S, Se, Te
400
How many double bonds exist in the correct lewis dot structure for Carbon Dioxide? Draw the structure.
2;
.. ..
:O=C=O:
400
Using the equation, c=yf, calculate the frequency of a radio wave which has a wavelength of 2.75 meters. (remember c is the speed of light, c=3.0x10^8).
1.1 x 10^8
500
What is the mass of an object with a density of 1.68 g/ml and a volume of 18.5 ml?
31.1 g
500
Which of the following is an extensive property?
a. Melting point
b. Temperature
c. hardness
d. length