Sci Notation & Metric System
Write 1.01x10^5 in standard form.
101,000
What are the three subatomic particles and where are they located in the atom?
electrons (-)- energy shells
protons (+)- nucleus
neutrons (0)- nucleus
List 2 properties for each type of element (metal, metalloid, nonmetal)
Metal: silver, malleable, conductive
Metalloids: varies
Nonmetals: Dull, brittle, not conductive
1 mole is how many particles/atoms/formula units?
6.02x1023
a. What does Temp measure?
b. What does Pressure measure?
a. kinetic energy of particles
b. force applied over an area (more collisions = more pressure)
Write 123,456,789 in scientific notation.
1.23456789x10^8
a. What is the proton number and mass number of carbon?
b. How can you calculate mass?
a. 6 protons, mass: 12.01 g/mol
b. protons + nuetrons = mass
Is chlorine conductive? How do you know?
No - it is not a metal.
Object A.
List two properties of each of the bond types:
a. Ionic
b. Covalent
c. Metallic
a. Ionic: high melting point, brittle, dissolves in water, conducts in water
b. Covalent: low melting point, sometimes malleable, sometimes dissolves in water, does not conduct in water
c. Metallic: high melting point, malleable, does not dissolve in water, conducts as a solid
Write 0.000000345 in scientific notation
3.45x10^-7
How many electrons does a neutral oxygen atom have?
8
FREE POINTS
:)
11.55 mL
Draw and label a cooling curve. The states of matter and phase changes should be labeled.
Curve downward.
Gas, condensation, liquid, freezing, solid
70,000 mg
Explain how matter was conserved in the chemiluminescence demo.
The contents in the flask had the same mass before and after the reaction - no matter was created or destroyed.
Why does each element have different bright line spectra?
Each element has different energy levels and different amounts of electrons, which influences the wavelengths that can be given off.
How many grams are in 2.05 moles of sodium?
119.8 g
What type of bond is between the two elements:
C and O
covalent
How many km are in 1 cm?
0.00001 km
Explain how energy was conserved in the chemiluminescence demo.
a. Explain how atoms emit light.
b. What influences the color?
An electron is excited by energy, and as it relaxes back down to the ground state it emits light energy.
The color (wavelength) depends on the energy that is released during the relaxation from the excited state energy level to the ground state energy level. If the energy difference is small, the wavelength will be bigger (red, orange, yellow). If the energy difference is large, the wavelength will be smaller (violet, blue, green).
How many particles are in 5 grams of water?
1.67x1023 particles
Explain how to determine the melting point temperature of a substance at a certain pressure using a phase change diagram.
Make a horizontal line from the given pressure to the line on the diagram that represent melting (between solid and liquid sections), and draw a vertical line straight down to identify what temperature that point occurs at.