Chem1 Link

When the elements of group 2 lose their valence electrons, what would be their charge?

+2

The temperature at the point of intercept of the plotted data with the Temperature axis is:

-273° C

How is the number 3.91 x 10-4 expressed in regular numbers?

0.000391

The digit that would have to be estimated in reading this instrument would be nearest:

0.001g

At what approximate temperature and pressure can all three phases of water exist simultaneously?

0.01° C, 4.58 mm Hg

Choose the number of significant figures indicated. 0.06

1

Choose the number of significant figures indicated. 90

1

How many electrons will metals generally have in their outer shell?

1 - 3

1. sales 2. theoretical research 3. quality of life 4. finds practical applications 5. manufacturing 6. market research 7. short- and long-term objectives 8. patent rights 9. services equipment

1. marketing 2. R&D 3. environmental engineer 4. product development 5. production 6. information chemist 7. corporate management 8. legal services 9. technician

Calculate the answer. Express it in scientific notation. All answers should have the correct number of significant figures. (6.93 x 101) (2.0 x 10-4) = _____

1.4 x 10^-2

1.father of atomic theory 2.discovered electron 3.expressed particles by wave equations 4.research on radioactivity 5."open spaces" model 6.applied quantum theory to atoms

1.Dalton 2.Thomson 3.Schrödinger 4.Curie 5.Rutherford 6.Bohr

1.hydrogen 2.helium 3.sodium 4.magnesium 5.potassium

1.H 2.He 3.Na 4.Mg 5.K

1.Ag 2.Pb 3.O 4.N 5.Cl 6.C 7.Ar 8.Zn

1.Silver 2.Lead 3.Oxygen 4.Nitrogen 5.Chlorine 6.Carbon 7.Argon 8.Zinc

1.fixed volume; variable shape 2.fixed volume; fixed shape 3.variable volume; variable shape

1.liquid 2.solid 3.gas

Complete the following reaction.

14/7N + 1/0n --- 14/6 C + 1/1 H

What is the maximum number of electrons in the following energy level? n = 3

18

Complete the chart. (Remember to enter a 0 if necessary.) Atomic Number: 10

1s: 2 2s: 2 2p: 6 3s: 0 3p: 0 4s: 0 3d: 0 4p: 0 5s: 0

What is the electron structure of sodium?

1s^2 2s^2 2p^6 3s^1

Each degree on the Kelvin scale equals:

1°C

Choose the number of significant figures indicated. 0.078

2

What is the maximum number of electrons in the following energy level? n = 1

2

Read the following graduated cylinder.

22.5 mL

Choose the number of significant figures indicated. 0.00666

3

Choose the number of significant figures indicated. 60.0

3

A student is asked to convert measurements from liters to milliliters and from milliliters to liters. His answers are shown in bold below. On which choice did he make a mistake?

3.6 L = 360 mL

Choose the number of significant figures indicated. 3.820

4

What does the 4 indicate in 1s22s22p4?

4 electrons

What is the approximate vapor pressure when the gas condenses at 80°C?

430

When writing 6,020,000 in scientific notation, it is correctly written as:

6.02 x 10^6

According to the following electron structure, how many valence electrons do these fluorine atoms have? F = 1s22s22p5

7

Calculate the answer. Express it in scientific notation. All answers should have the correct number of significant figures. (386)(204) = _____

7.87 x 10^4

Record the length of the object shown.

72.6 mm

A student is asked to convert measurements from meters to millimeters and from millimeters to meters. His answers are shown in bold below. On which choice did he make a mistake?

9,070 mm = 90.7 m

Measure the length of the line within the amount of uncertainty. Be careful to look at the required label.

A = 3.60 cm B = 22.0 mm C = 1.25 cm D = 7.0 mm

Using the periodic table, choose the more reactive non-metal. At or Br

Br

Using the periodic table, choose the more reactive non-metal. Br or As

Br

Compounds can be produced by what process?

Chemical change

How is condensation explained by the Kinetic Molecular Theory?

Cooling reduces particle motion, resulting in coalescence by attractive forces.

The person given credit for the first modern atomic theory was _____.

Dalton

A mixture of uneven distribution and easy separation is called homogeneous.

False

A solution which contains maximum solute at a given temperature is supersaturated.

False

Colloidal particles will eventually settle out.

False

Research has shown that the electrons orbit the nucleus in circular motions as shown on the classic Bohr model.

False

Solids and liquids have both mass and volume, but a gas has only mass.

False

Temperature is inversely related to the average kinetic energy of a gas.

False

The Mohs hardness scale increases linearly from 1 to 10.

False

The reduced vapor pressure at high altitudes causes a liquid to boil at a higher temperature.

False

The three aspects of the measuring process are units, systems, and instruments.

False

Volume is a measure of the quantity of matter in an object.

False

Using the periodic table, choose the more reactive metal. Ca or Ra

Ra

Which element in period 5 is the most active metal?

Rb

When does the electron shown release the greatest amount of energy as it moves from one level to another?

S.1 to G.S.

What factor(s) may be responsible for the ionization energy within a period? Select all that apply.

The attractive force of the nucleus increases. The diameter of the atom decreases somewhat as electrons are added.

Why does the ionization energy change when moving down a group of elements?

The attractive force on the valence electrons decreases as the atom gets larger.

When the substance in the diagram is heated to "T2," what has happened? Select all that apply.

The average kinetic energy has increased. More molecules have a higher energy level.

Place the correct relationship on the graph. R = diffusion rate of gas MW = molecular weight

The graph that starts at the top left and curves down to the bottom right

A hypothesis which appears to be verified by multiple experiments and/or researchers may become a:

Theory

All the nonmetals have some similar physical properties.

True

Drawing a conclusion derived from knowledge of an established principle is called deductive reasoning.

True

Each element possesses unique chemical and physical properties.

True

Hardness may be defined as the resistance of a material to scratching.

True

If temperature is held constant for an ideal gas, as P and V change for a given gas sample, the PV products will be constant.

True

Mass is measured against a standard by using a balance.

True

Scientists have not yet determined exactly why electrons do not collapse into the nucleus.

True

The Law of Definite Proportions states that substances combine in predictable proportions and that excess reactants remain unchanged.

True

The spontaneous intermingling of atoms among different substances is accomplished by diffusion.

True

The state of water is determined solely by the conditions of pressure and temperature.

True

The various components of a mixture do not combine chemically.

True

Determine the unknown mineral using the information given below. Be sure to use significant figure rules when doing calculations. Mass is shown on the triple beam.

Volume of water displaced = 0.175 L Mass: 981.0 g Density 5.61 g/cm³ Hardness: = 2.5 - 3 Determine the unknown mineral. Unknown mineral: chalcocite

Which is not a physical property?

ability to combine with oxygen

Which of the following electron configurations for neutral atoms is correct?

argon: 1s 22s 22p 63s 23p 6

Pure sugar is an example of a(n):

compound

J. J. Thomson is credited with the discovery of:

electrons

A quantum is a unit of:

energy

The dashed segment of the plotted experiment is called:

extrapolation

Which phase change temperatures are identical on the phase diagram? Select all that apply.

freezing point - melting point boiling point - condensation point

Which is the correct measure of density?

g/cm^3

Which of the following radioactive emissions is the most penetrating?

gamma rays

An alpha particle is equivalent to:

helium ion

An atom that gains or loses one or more electrons is called a(n) _____.

ion

Which molecules shown on the graph above are likely candidates for evaporation?

molecules under the right end of the curve

Can colloidal suspensions be separated out by filtration?

no

Complete the sentence. Select all that apply. The emission of a Beta particle has the effect of:

no change in mass adding a proton of zero mass to the nucleus

If you move an object from the base of a mountain to the top of the mountain:

only mass remains constant

A horizontal row of elements in the periodic table represents a

period

A theory which repeatedly fails to confirm the expected predictions after extensive research:

probably is incorrect

All atoms of the same element have the same number of:

protons

An observation that requires measurement is called

quantitative

Complete the sentence. Select all that apply. The discoveries of Niels Bohr were:

quantum energy emissions orbits of electrons

Complete the sentence. Select all that apply. Marie and Pierre's discoveries included:

radium polonium

What is the primary cause of diffusion?

random internal motion of atoms and molecules

Conclusions drawn from personal beliefs are:

subjective

Which graph best shows an inverse relationship?

the graph that starts at the top left and curves to the bottom right

Which energy level requires the most energy to remove an electron?

the innermost shell

The definition of volume is:

the space occupied by mass

In order for a high temperature boiler or steam engine to produce superheated steam:

the system must be pressurized

In the reaction 2NaCl + 2H2O2NaOH + Cl2 + H2, the reactants should:

weigh the same as the products