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Chemistry Math
People and Experiments
Definitions
Introductory Chemistry
Atoms
100

Convert 150 degrees Celsius to Kelvin.

423.15 K

100

What model did JJ Thomson create for the atom.

Plum Pudding Model

100
What is a chemical property?

Can only be observed through a change in composition.

100

What is another name for a uniform mixture.

Homogeneous mixture

100

What are the three main parts of an atom?

Electrons, protons, and neutrons.

200
How many significant figures are in 0.00248607

6 significant figures

200

Which part of the atom caused the light source to bounce back when it hit the gold foil in JJ Thomson's experiment.

Protons in the nucleus.

200

What is the law of definite proportions?

Compounds always have the same elemental composition.

200

Name three intensive properties.

Density, color, melting point, etc.

200

How many neutrons are in Carbon-14?

8 neutrons

300

Multiply (0.0321)(4500)

Use correct significant figures.

140

300

What were the two laws created by Joseph Proust and John Dalton

Law of definite proportions

Law of multiple proportions

300

What is an isotope? Provide an example.

Same number of protons but different number of neutrons.

300

Name the five steps of the scientific method

1. Observe

2. Hypothesis

3. Predict

4. Test

5. Analyze Results

300

On the board, write the element symbol, mass number, and atomic number in proper form of a atom with 8 protons and 11 neutrons.

Element symbol of 'O' with 19 on the top left and 8 on the bottom left.

400

How many mL in 2.79x10^-3 liters.

2.79

400

What was significant about the way Mendeleev set up what would later become the periodic table?

Hint: Dr. Friedman put a big exclamation mark next to it.

Mendeleev recognized patterns and put placeholders with clear predictions for future elements that had yet to be discovered.

400
What is the "weakest link" rule in significant figures refer.

You can know a result only as well as you know the least well-known measured value used in the calculation.

400

What is the change from gas to solid called?

Deposition

400

What part of the atom has negligible mass but makes up nearly all of the volume of an atom?

Electron

500

Jet fuel is measured using mass, but dispensed by volume the density of jet fuel is 0.80 kg/L.

What is the volume of 16,100 kg of jet fuel?

Round to two significant figures, as well as putting your final answer in scientific notation.

2.0 x 10^4 L

500

What is Avogadro's Law?

Equal volume gases have same number of particles, but masses will be different.
500

In science, what do you call a "description of a phenomenon?"

Law

500

What is a poly-atomic ion? Give an example for full credit.

An ion with multiple ions

PO4-2 , CO3-2 , etc

500
What would be the charge of an atom with 7 protons, 8 neutrons, and 6 electrons?

+1