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Write the full symbol for the following:
Beryllium with 5 neutrons and 2 electrons
Include A, Z, X, and the charge
A: 9, Z: 4, X: Be, Charge 2+
Convert 2.35 moles of carbon to atoms.
1.42*1024
Convert 3.0 grams into milligrams.
3.0 * 103 milligrams
How many sig figs are in 0.0054
2
Which aspect of the atomic theory is stated incorrectly
1. Each element is composed of tiny, indestructible particles called atoms.
2. All atoms of a given element have the same mass and other properties that distinguish them from the atoms or other elements.
3. Atoms combine in simple whole-number ratios to form compounds.
4. Atoms of one element occasionally change into atoms or another element. In a chemical reaction, atoms change the way they bind together to other atoms and can change their identity.
A photon has a frequency (v) of 2.68 x 106 Hz. Calculate its energy.
E=1.78*10-27J
How many atoms are in 10.0g of gold
3.06*1022
Convert 7.0 meters into cm
7.0 * 102cm
How many sig figs are in 1.0070
4
TRUE OR FALSE?:
When multiplying or dividing with significant figures, count the number of significant figures in the decimal portion of each number in the problem. (The digits to the left of the decimal place are not used to determine the number of decimal places in the final answer.). Then, round the answer to the LEAST number of places in the decimal portion of any number in the problem.
False: This is the case for addition and subtraction, not multiplication and division.
Copper is made up of two isotopes, Cu-63 (62.9296 amu) and Cu-65 (64.9278 amu). Given copper's atomic mass of 63.546, what is the percent abundance of Cu-63?
Cu-63: 69%
You are planning on driving with three friends to Pardeeville, WI for spring break, which is 750 miles one way. Your van averages 15 miles per gallon. The average cost for gasoline is $3.50 per gallon. How much will each person need to pay toward gas for the trip (there and back), assuming the cost is evenly divided.
87.50 $/person
Convert 37.0 decimeters to mm
3.7 * 103 mm
Give the answer with the correct number of sig figs: 2.3*3.45*7.42=
59
Which of the following statements is NOT correct?
A. A liquid has a definite volume and shape.
B. The particles in a solid are very closely packed with each other.
C. A gas is less dense than a solid or a liquid.
D. The particles in a solid have fixed positions and can only vibrate in those positions.
E. The state of matter depends on the relative positions of the particles, how strongly they interact with one another, and the temperature and pressure applied to the sample.
A
Calculate the energy and frequency of red light having a wavelength of 6.80 x 10-5cm
E= 2.92*10-19J, v=4.4*1014Hz
Find the mass in pounds of 1.00m3 of corn syrup (density of 1.38g/cm3) Hint: 1 kg=2.20462 lb
3.04*103lbs
0.002 centimeters to mm
2.0 * 10-2mm
Give the answer with the correct number of sig figs: 23.1 + 4.77 + 125.39 + 3.581
156.8
Which of the following is NOT true?
A. A particular alloy of aluminum includes 1.5% manganese and 0.1% copper. This is an example of a homogenous mixture.
B. Liquid propane, C3H8, is an example of a compound
C. Ozone gas, O3, is an example of an element that exists as molecules.
D. Gazpacho is a soup with extra chopped vegetables added to the blend of vegetables. This is an example of a heterogenous mixture.
E. All of these statements are true
E
Gallium, atomic number 31, has two stable isotopes. Ga--69 has an isotopic mass of 68.926 amu and Ga-71 has an isotopic mass of 70.926 amu. What is the mass of Ga-71 in a 3.585 gram natural sample of gallium?
1.42g
Your Kitten is very sick and your vet prescribed medicine. You need to give your kitten 550 mg of medicine every 8 hours for the next 3 weeks. The medicine is only sold in 225 mg tablets. A bottle of 18 tablets costs $10.95. How many bottles of medicine should you buy to save your kitten from the grip of death and how much will it cost you?
$98.55
Convert 9.5 kiloliters to nanoliters
9.5*1012nL
(10,569-958.82-1.8*10-1)/(0.9950+8.60+0.015)=?
1.00*103
Which of the following is NOT true?
A. A theory cannot be disproven even when there is a new observation that conflicts with the theory.
B. A chemist mixes sodium with water and witnesses a violent reaction between the two. This is best classified as an observation.
C. A law summarizes a series of related observations, while a theory attempts to explain why and predicts behavior beyond the current observations.
D. A hundred years ago, Svante Arrhenius suggested that the presence of heat-absorbing gases in the atmosphere might increase the average temperature of the ground. This is an example of a hypothesis.
E. Choose this answer if all of the above are true.
A: A theory can be disproven if there is a new observation conflicting with the theory, so this is a false statement.