Chemistry Mid Term Review

79 terms by hcochrane 

Create a new folder

Advertisement Upgrade to remove ads

a chemical can be defined as...

any substabce that has a definite composition

an atom is...

the smallest unit of matter that maintains its chemical identity

a compound is...

a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances.

Which of the following is not a physical change? (a.grinding, b.cutting,c.boiling,d.burning)

burning

noble gasses are in Group 18, and are best known because they are...

unreactive

a state of matter in which a material has no definite shape but has a definite volume is the ________ state

liquid

the liquid state of mater can be described as...

having a definite volume but not a definite shape

a solid substance is...

always the same shape regardless of its container

What happens to the energy in a substance when it changes state?

it changes form, but is neither destroyed nor increased.

A mixture is...

a blend of any two or more kinds of matter, as long as each maintains its own unique properties

The vertical columns on the periodic table are called...

groups

The horizontal rows on the periodic table are called...

periods

A nonmetal is usually...

brittle

Metalloids are often...

semiconductors

A statement that can be tested experimentally is a...

hypothesis

The symbols for units of length in order from largest to smallest are...

km, m, cm, mm

The relationship between the mass m of a material, its volume V, and its density D is...

D=m/V

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm3. The density of gold is...

19.3 g/cm3

What is the density of 37.72 g of material whose volume is 6.80 cm3?

5.55 g/cm3

1.06 L of water is equivalent to...

1060 mL

If 1 inch equals 2.54 cm, how many centimeters equal 1 yard?...

91.4 cm

A measurement that closely agrees with an accepted value is best described as...

accurate

A numerical result is said to have good precision if...

repeated measurements agree closely

The number of significant figures in the measured value 0.032 g is...

3

Which of these measurements has been expressed to three significant figures?...

.202

When 64.4 is divided by 2.00, the correct number of significant figures in the result is...

3

The speed of light is 300 000 km/s. In scientific notation, this speed is written to one significant figure as...

3 x 10^5 km/s

When 6.02 x 1023 is multiplied by 9.1 x 10^-31, the product is...

5.4 x 10-7

According to the law of conservation of mass, when sodium, hydrogen, and oxygen react to form a compound, the mass of the compound is _____ the sum of the masses of the individual elements...

equal to

Experiments with cathode rays led to the discovery of the...

electron

Whose series of experiments identified the nucleus of the atom?...

Rutherford

Because most particles fired at metal foil passed straight through, Rutherford concluded that...

atoms were mostly empty space

The atomic number of oxygen, 8, indicates that there are eight...

protons in the nucleus of an oxygen atom.

The total number of protons and neutrons in the nucleus of an atom is its...

mass number

Chloride has atomic number 17 and mass number 35. It has...

17 protons, 17 electrons, and 18 neutrons

The mass of 1 mol of chromium (atomic mass 51.996 amu) is...

51.996 g

How many moles of atoms are in 50.15 g of mercury (atomic mass 200.59 amu)?...

0.2500 mol

A sample of tin (atomic mass118.71 amu) contains 3.01 x 1023 atoms. The mass of the sample is...

59.3 g

The mass of 5.000 mol of cesium (atomic mass 132.9 amu) is...

664.5 g

For electromagnetic radiation, c (the speed of light) equals...

frequency times wavelength

A quantum of electromagnetic energy is called a...

photon

The specific wavelengths of light seen through a prism that are made when high-voltage current is passed through a tube of hydrogen gas at low pressure is a...

line-emission spectrum

If electrons in an atom have the lowest possible energies, the atom is in the...

ground state

The Bohr model of the atom is an attempt to explain hydrogen's _______...

line-emission spectrum

According to the Bohr model of the atom, the single electron of a hydrogen atom circles the nucleus...

in specific, allowed orbits

Which model of the atom explains the orbitals of electrons as waves?...

the quantum model

All of the following describe the Heisenberg uncertainly principle except...

it helps to locate an electron in an atom

A three-dimensional region around a nucleus where an electron may be found is called an...

orbital

The main energy levels of an atom are indicated by the...

principal quantum numbers

The angular momentum quantum number indicates the...

shape of an orbital

How many orbitals can exist at the third main energy level?...

9

How many electrons are needed to completely fill the fourth energy level?...

32

The statement that an electron occupies the lowest available energy orbital is...

the Aufbau principle

The element with electron configuration 1s2 2s2 2p6 3s2 3p2 is...

Si (Z=14)

What is the electron configuration for nitrogen, atomic number 7?...

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

The number of electrons in the highest energy level of the argon atom (atomic number 18) is...

8

The electrons involved in the formation of a chemical bond are called...

valence electrons

The B―F bond in BF3 (electronegativity for B is 2.0; electronegativity for F is 4.0) is...

ionic

Bond length is the average distance between two bonded atoms...

at which potential energy is at a minimum

In drawing a Lewis structure, each nonmetal atom except hydrogen should be surrounded by...

8 electrons

In drawing a Lewis structure, the central atom is generally the...

least electronegative atom

62. What is the correct Lewis structure for hydrogen chloride, HCl?

..
H-Cl..
..

Bonding in molecules or ions that cannot be correctly represented by a single Lewis structure is...

resonance

VSEPR theory is a model for predicting...

the shape of molecules

According to VSEPR theory, the structure of the ammonia molecule, NH3,
is...

trigonal-pyramidal

Use VSEPR theory to predict the shape of the hydrogen chloride molecule, HCl...

linear

Use VSEPR theory to predict the shape of the carbon tetraiodide molecule, Cl4...

tetrahedral

Dipole-dipole forces are considered the most important forces in polar substances because the London dispersion forces present in polar substances...

are usually much weaker than the dipole-dipole forces

The strength of London dispersion forces between molecules depends on...

both the number of electrons in the molecule and the mass of the molecule

Give the name: NaCl

Sodium Chloride

P3S5

Triphosphorus Pentasulfide

(NH4)3N

Ammonium Nitride

CO

Carbon Monoxide

FeSO4

Iron (II) Sulfate

Give the formula: Dinitrogen heptabromide

N2Br7

Magnesium Phosphate

Mg3 (PO4)2

Iron (III) Iodide

FeI3

Potassium Nitride

K3N

Lead (IV) Oxide

PbO2

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set