Sapling Learning Ch. 3

Classify these images as solid, liquid, or gas at the molecular level
a) balls jumping around
b) balls all together settled
c) balls barely jumping

Classify each substance as an element, a compound, a homogeneous mixture, or a heterogeneous mixture.
a)two types of balls barely moving
b)balls all together
c)three balls connected
d)three types of balls, two types are connected the third type is running around crazy.

Write the element name that corresponds to the following element symbols.
a)Al
b)Na
c)Zn

Write the element symbol that corresponds to the following element names. Use the proper formatting; letter case matters!
a)hydrogen
b)lithium
c)oxygen

Name all the elements that are liquid at room temperature.

Classify each of the following elements as metals, nonmetals, metalloids (semimetals):
Xe TI Si ln
Ge Ga S

Elements found to the left of the metalloids on the periodic table display which properties’select all that apply.
a) They tend to gain electrons when forming ions.
b)They tend to be good conductors.
c)They tend to lose electrons when forming ions.
d)They tend to be brittle.
e)They tend to be ductile.
f)They tend to be poor conductors.

Classify each compound by the number of chlorine atoms indicated in the chemical formula.

Write the chemical formula for each compound described.
a) magnesium chloride (1 Mg ion, 2 Cl ion)
b) lithium sulfide (2Li ion, 1 Sion)

The following are properties of the metal lithium. Classify them as physical or chemical.
a)In the liquid state reacts spontaneously with its glass container, producing a hole in the container.
b)Silvery gray in color.
c)Reacts violently with chlorine to form a white solid.
d)Burns in oxygen with a bright red flame.
e)Light enough to float on water.
f)Can be cut with a sharp knife.
g)Changes from silvery gray to black when placed in moist air.
h)In the liquid state it boils at 1317 degrees Celsius.

Label each transition in this flow chart as a chemical change or a physical change.
A to B: sets of two red and blue balls just floating around not mixing
A to B: same but red and blue sets mixed.
B to C: formed sets of threes where there are two blue and one red in each set.
B to D: chamber is split top half has sets of two and only blue. bottom half has sets of two one blue and one red in each set.
D to E: blue separate out of pairs and move around quickly.
D to F: sets of one red and one blue group together and stay still.

List the predominant forms of energy produced when each of the following processes occur:
a) An electric light bulb is turned on.
b) A log is burned in a fireplace
c) A green plant “grows”
d) A bicycle is pedaled.
e) A flashlight is turned on.

Which observation illustrates the law of conservation of mass?
a) Burning 10g of propane produces twice as much carbon dioxide as burning 5g of propane.
b) The C:O mass ratio of one compound is exactly double that of another compound.
c) When 3 g of carbon reacts with 8g of oxygen, 11g of carbon dioxide is produced.
d) The C:O mass ratio of a particular compound is the same, regardless of the size or source of the sample.

In the combustion of hydrogen fas, hydrogen reacts with oxygen from the air to form water vapor.

hydrogen +oxygen —> water

If you burn 56.6g of hydrogen and produce 506g of water, how much oxygen reacted?