Chem Final

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A rare metal alloy is a superconductor at 55K. What is the temperature on the celcius scale?

-218C

How many photons of light are emitted when the electron in a hydrogen atom drops from energy level 3 to 1?

1

What does the ion phosphate contain?

1 phosphorus, 4 oxygen, to the third power negative

If 2.43g of Mg burns in air to produce 4.03g of MgO, what is the mass of reacting oxygen gas?

1.6g

What are the two unit factors that relate meters and millimeters?

1000 mm/1m and 1m/1000mm

One micro is:

10^-6/one millionth

If a rectangular A1 block measures 3.80 cm by 2.55 cm by 1.25 cm. What is tjhe volume of the rectangular solid?

12.2 cm3

Which is true about 60C

140F

4.51 x 3.6666 = _________

16.54

Calculate 2.76 x 6.63466 =

18.31

Mass of a proton is

1840 times mass of electrons

SI unit for volume is m3 which of the following is correct?

1L = 1000cm3

electron configuration for an atom of manganese

1s2 2s2 2p6 3s2 3p6 4s2 3d5

A piece of gold with 40g of its mass has a volume of 2cm^3, what is its density?

20 g/cm3

A piece of gold with 60g of its mass has a volume 2 cm3, what is its density?

30 g/cm3

how many neutrons are in the nucleus of an atom of copper-65?

36

numbers of significant figures in 060104 are:

5

How many significant figures are there in 0.00745610

6

the average of three measured lengths 6.64, 6.68, and 6.70 is:

6.67

Element X has two natural isotopes: X-63 (62.940 amu) and X-65(64.924 amu). Calculate the atomic mass of element X given the abundance of X-63 is 69.17%

63.55 amu

If a chemistry student weighs 155 lbs, what is the mass in kg?

70.4kg

Round off the following measurement to 3 significant digits: 726.8 mL

727 mL

The speed of sound in air is about 343 m/s. What is this speed in miles per hour?

767 mi/hour

A weather forecaster predicts the temperature will reach 31C, what is this Temperature in F?

88F

A weather forecaster predicts the temperature will reach 31C. What is this temperature in F?

88F

Which of the following is an example of quantized change in energy?

A ball rolling down a flight of stairs

Closeness of measurement is:

Accuracy

Which of the following of Dalton's proposals is still valid?

All of the above

What is the name of this chemical: NH4^+3

Ammonium

98F = _____C

Average of A and B

Which of the following describes a substance in the solid physical state?

B. the substance has a fixed volume C. the substance compresses negligibly

Which of the following is insoluble in water

BaSO4

What is CO3^-2

Carbonate

What is the smallest structure in this list that can be seen with an ordinary desk microscope?

Cell nucleus

What is the name of-- CrO4^ -2

Chromate

Water contains hydrogen and oxygen. Which of the following describes water?

Compound

Matter changing from liquid to gas is called?

Evaporation

Acetate can be shown as C2H3O2 or CH3COO-

False

An atomic molecule and cell molecule are about the same size

False

Which of the following metals react with sulfuric acid?

Fe

OH- can be described as which polyatomic ion?

Hydroxide

Predict the product from the following reaction: LiHCO3

Li2CO3, H2O, CO2

predict the product of Mg + O2 --> ________

MgO

Atoms combine to form:

Molecules

Which of the following statements is true?

Molecules are made of atoms

Which subatomic particle has a relative charge of 0 and a mass of 1 amu

Neutron

Dichromate are toxic substances that are usually insoluble in water. What is the formula for this polyatomic ion:?

None of the above

What is the max number of electrons that can occupy the 3rd energy sub level?

None of the above (d holds 10)

Which of the following is an example of chemical change?

Oxidation

Which of these is found in the nucleus of an atom?

Proton

the most stable allotrope of Sulphur is

S8

The matter has a fixed shape and volume with particles closely packed together with little movement

Solid

which arrangement of atoms is correct from low to high density

Sr, Mo, Ag

What is the different between sulfate and sunfite

Sulfate has one more oxygen than sulfite

Does SO3^-2 represent sulfate or sulfite?

Sulfite

which of the following is evidence for a chemical reaction

all of the above

when a neutral atom gains or loses electrons it becomes ___________

an ion

which of the following is true for both the orbit and an orbital

an orbit and an orbital represent a fixed energy state

Which of the following is part of Dalton's atomic theory?

atoms of the same element are alike in mass and size

The atomic radius tends to __________

decrease from left to right in periodic table

what particles form the outside fo an atom?

electron

which of the following discoveries led to the development of the quantum mechanical model?

electrons occupied different energy levels around the nucleus

ionization energy is the amount of energy required to add an electron in a ground state

false

anything that occupies space and has mass

matter

metalloids have some characteristics of __________

metals and nonmetals

When atoms bond together they form...

molecules

oxygen, sulfur, and selenium are ________

non metals

473F =

none of the above

Calculate 6.8/172.04

none of the above

Which is true about 78.3C?

none of the above

for all electromagnetic radiations:

none of the above

when the elements are arranged by atomic number, their ____________ properties vary periodically.

physical and chemical

Sugar dissolving in water is a ____________

physical change

Alpha rays are:

positively charged

the nucleus of an atom is:

positively charged and has a high density

which scientist proposed the idea of the "nucleus" after the unexpected results of his gold foil experiment?

rutherford

Matter changing from solid to a gas is called

sublimation

who was the first person to suggest the idea of electrons?

thomson

electro affinity is the energy change accompanying the addition of an electron to a gaseous atom

true

electrons can have specific energy value

true

nonmetals are dull and poor conductors of heat electricity

true

wave length is the distance between identical points on successive waves

true


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