Homework problems

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What is the mass number for an atom of barium containing 56 protons and 79 neutrons?

135

The number 64800 has ___ significant figures.

3

How many significant figures does the number 48.050 have?

5

Which of the following numbers contains five significant figures?

50.260

Write the chemical formula for aluminum oxide?

Al₂O₃

Write the chemical formula for barium bromide?

BaBr₂

Provide the correct IUPAC name for C₂O₃?

Dicarbon trioxide

Provide the correct IUPAC name for H₂O?

Dihydrogen monoxide

Which has the incorrect name-formula combination?

Iodine trifluoride - IF

Write the chemical formula for lithium chloride?

LiCl

Which scientist determined the charge of the electron?

Robert Millikan

Which of the following transition metals would be expected to have the smallest atomic radius?

Ruthenium (Ru)

Calculate the answer and report the correct number of significant figures. 0.02 cm x 2.371 cm

0.02 cm×2.371 cm=0.04---742 cm2=0.05 cm2

Calculate the answer and report the correct number of significant figures. 1.030 g ÷ 2.87 mL

1.030 g2.87 mL=0.358------885 g/mL= 0.359 g/mL

A volumetric flask contains 100.0 mL of water. This volume is added to a beaker containing 175 mL of water. Choose the value that expresses the new total volume of water in the beaker with the correct number of significant figures.

100.0mL+175mL= 275mL

What is the mass number for an atom of mercury-containing 80 protons and 119 neutrons?

199

The number 4.0 × 10⁵ has ___ significant figures

2

Iron exists in nature as a mixture of predominantly three isotopes: ⁵⁴₂₆Fe (53.94 amu), ⁵⁶₂₆Fe (55.93 amu), and ⁵⁷₂₆Fe (56.94 amu). If the most common isotope, ⁵⁶₂₆Fe, accounts for 91.75% of iron atoms, and the average atomic mass of iron is 55.85 amu, what is the percent abundance of the rarest of these three isotopes of iron?

2.81 %

Chlorine exists in nature as a mixture of two stable isotopes, Cl-35 and Cl-37. If the atomic mass of chlorine is given as 35.45 amu, which of the following represents the percent abundance of Cl-37?

23%

A patient needs 25.0 μg of Synthroid each day. The pharmacy only has Synthroid that is 0.025 mg per scored tablet. How many tablets should be taken each day by the patient?

25.0 μg×1 mg1000 μg×1 tablet0.025 mg= 1.00 tablet

How many protons are in an atom of Cu?

29

A beaker of water has an initial mass of 455.2 g. After it has been left uncovered for several days, some of the water has evaporated. The new mass of the beaker is found to be 422.55 g using a more precise balance. Choose that value that expresses the mass of the evaporated water using the correct number of significant figures.

455.2g−422.55g= 32.7g

An unknown element X has the following isotopes: ⁵²X (91.00% abundant), ⁴⁹X (8.00% abundant), ⁵⁰X (1.00% abundant). What is the average atomic mass in amu of X?

51.7 amu

What is the atomic number for an element whose mass number is 145, which contains 85 neutrons per atom?

60

What is the atomic number for an element whose mass number is 180, which contains 107 neutrons per atom?

73

Write the chemical formula for aluminum fluoride?

AlF₃

Which postulate(s) of Dalton's atomic theory of matter is/are NOT true?

All atoms of a given element are identical Atoms are indestructible.

Provide the correct IUPAC name for AlF₃.

Aluminum fluoride

Provide the correct IUPAC name for BaBr₂?

Barium bromide

Write the chemical formula for barium nitride?

Ba₃N₂

Provide the correct IUPAC name for BBr₃?

Boron tribromide

Write the chemical formula for calcium hydride?

CaH₂

Write the chemical formula for calcium oxide?

CaO

Write the chemical formula for calcium nitride?

Ca₃N₂

Write the chemical formula for calcium phosphide?

Ca₃P₂

Write the chemical formula for cadmium chloride?

CdCl₂

Provide the correct IUPAC name for CuF₂?

Copper(II) fluoride

Provide the correct IUPAC name for N₂S₃?

Dinitrogen trisulfide

Which scientist developed the nuclear model of the atom?

Ernest Rutherford

The accepted value for the density of iron is 7.9 g/mL. Which of the following sets of experimental data for the density of iron is the most accurate?

Group 1: 7.98 g/mL, 7.85 g/mL

Which one of the following would be a physical property of glucose?

In its pure form, it is a white powder.

Which one of the following would be a chemical property of a sample of neon gas?

It is inert

Which has the correct name-formula combination?

Manganese(II) sulfide - MnS

Provide the correct IUPAC name for (Hg₂)₃N₂?

Mercury(I) nitride

Rutherford's gold foil experiment determined that?

Most of the space in an atom is empty except for a concentrated area called the nucleus.

Neutral atoms of all isotopes of a given element have the same?

Number of electrons

Provide the correct IUPAC name for RnF₂?

Radon difluoride

Provide the correct IUPAC name for AgF?

Silver fluoride

Which of the following metals would be expected to have the smallest atomic radius?

Tantalum (Ta)

The Millikan oil drop experiment determined?

The charge of the electron

The cathode ray tube experiment determined?

The existence of electrons

What does the mass number of an atom represent?

Total number of protons and neutrons in the atom

If you were given the task of measuring 75 milliliters of a liquid, which measuring device would you use?

a 100-milliliter graduated cylinder

Which of the following is a pure substance that can be broken down into simpler substances by chemical means?

compound

You measured the mass of a dry powder on a balance to be 23.76 g. What would you report as the uncertainty of this measurement?

± 0.01

Which of the following pairs represent isotopes?

²⁸Si and ²⁹Si

Which of the following would be an isotope of ¹⁴N?

¹⁶N

Which of the following atoms has the same number of neutrons as ⁵⁹Ni?

⁶⁰Cu


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