Chemistry first semester exam

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18

How many groups are in the periodic table?

atomic mass

Mendeleev arranged the elements in his periodic table in order from increasing

metals

Which category of elements have the property of being malleable and ductile?

Mendeleev

The scientist credited with the first periodic table of elements was

7

How many periods are in the periodic table?

The periodic law

the relationship in which the physical and chemical properties of elements show a periodic pattern when the elements are arranged by increasing atomic number is called

groups

elements that have similar properties are aligned in vertical columns called

Iodine

which is the halogen that is in period 5?

Newlands

Which scientist characterized the law of octaves?

the chemical propertiesw of unknown elements and the existance of unknown elements

Mendeleev's periodic table was able to predict_____

metalloids (semimetals)

which category of elements is commonly used to make computer ships and solar cells due to their ability to conduct electricity only under certain conditions (semiconductors)

Dobereiner

Who classified metals into triads?

the energy change that occurs when an element gains an elecron

Electron affinity is

Mosely

Which scientist first arranged elements by atomic number?

true

TF
the max number of allowed valence electrons in any atom is 8

False

TF
The number of electrons in an orbital depends on the orbital's shape

true

TF
a quantum is a specific amount of energy

true

TF
an element can be identified by the characteristic bright-line atomic emission spectrum it can produce

false

TF
there are a total of three different types of d orbitals

Aufbau principal

electrons must be added one at a time to the lowest energy orbitals available according to the

distribution among orbitals

what info about electrons is given by the electron configuration?

in the ground state

when electrons are in their lowest energy orbitals available, the atom is

atomic orbitals

what is the region around the nucleus where electrons can be found called?

d

an f orbital can have how many orientations

occupy equal energy orbitals so that a maximum number of unpaird electrons result

Hand's rule states that electrons

in an excited state

when electrons are in a higher energy they are said to be

absorbes energy

When an electron jumps from a ground state to an excited state, it

2 electrons with the opposite spin

the Pauli exclusion principal states that each orbital in an atom can hold

position and velocity

the heisenberg uncertainty principle states that 2 things of an electron cannot be simultaneously measured

S

the _____ orbital is shaped like a sphere

in the outermost energy level.

Valence electrons are found

Rutherford

Which scientist described a positively charged core (nucleus) in the middle of a lot of empty space?

radium and polonium

Marie and Pierre Curie isolated which radioactive elements?

Chadwick

Which scientist described the existance of the neutron?

Atom

Which one is comprised of the other three? (proton, atom, electron, neutron)

electron

Which is the smallest part of an element that retains all the properties of the element?

silicon

Which element has 14 protons?

protons and neutrons

According to the modern concept of the atom, which are located in the nucleus of an atom.

Strong nuclear force

te force that holds protons together in the nucleus is called

0

what is the charge on a gama ray?

delta

which of the following are not produced by nuclear decay? alpha, beta, gama, delta

Democretus

who is the first to propose that matter is composed of tiny invisible particles?

anunequal number of protons and electrons

An ion always contain an

False

Tf
Aristotle named atoms atoms

False

tf
A cathode ray tube consists of a stream of protons

TRUE

tf
in a neutral atom the number of protons is equal to the number of electrons

True

TF
Gama rays emits energy but no particles

true

True
Nuclear decay can change one element into another element

False

TF
isotopes are forms of an elements that have the same number of protons but a different number of electrons

TRUe

TF
The atomic mass unit is based on the element Carbon-12

True

TF
A proton is a subatomic particle carrying a charge equal to but opposite of an electron

Electrical attraction between oppositely charged ions

The basis of an ionic bond is the

polyatomic ion

Ions that are formed from more than one atom is called

0

An ionic compound must have an overall charge of

high boiling points

Which is a property of substances that exhibit metallic bonding?

Chemical bond

which is described as the force holding two atoms together

High melting points

What is a physical propert of ionic compounds in their solid state?

The simplest whole number ratio of different atoms in a compound

An emperical formula always indicates

one atom

A monatomic ion consist of

noble gass

Elements tend to gain or lose electrons in order to acquire the electron confirguration of a

True

TF
Metallic elements tend to form cations rather than ions

tRuE

TF
A crystal lattice is a 3d structure formed by positive ions surrounded by negative ions surrounded by positive ions

false

TF
Because of the number of negative ions packed around each positive ion in a crystal lattice, ionic compounds are good conductors of electricity and heat in their solid state

FaLSe

TF
A single unit of an ionic compound is referred to as a molecule

false

TF
The oxidation number or charge of an ion ids always equal to the number of valence electrons it has

true

TF
An alloy results when an additional element is introduced into the metallic crystal

TRUE

A metallic bond is the attraction of a metallic cation for delocalized electrons

number of beats

A scientist designed a new drug to help slow the beating of the heart, and is interested in the beats of the heart with time. The scientist measures the beats of the heart every ten seconds. What is the dependent variable?

Clean up

What should you do when an experiment is finished?

protect your eyes

You should wear safety goggles to

it overlaps so many sciences.

Chemistry has been called the central science because...

color

Which is a qualitative measurement? color, mass, time, length

temperature

which is a quantitative measurement? hardness, color, taste, temperature

chem is try

The study of all substances and the changes they undergo is?

true

TF
A samples's color is a qualitative measurement

true

tf
If the distance covered by a car at constant speed for different intervals of time, then the distance is a dependant variable

f

tf
the goal of all experiments is to prove your hypothisis correct.

true

tf
when conducting an experiment, you should only manipulate one variable at a time

true

TF
The volume of a baloon increases as it is heated. The volume of the ballon is the dependant variable.

false

TF
if an accidental discovery is made, it means something went wrong with the experiment and the results should be discarted.

falso

TF
Mass is defined as anything that can be observed

false

tf
the best fit line connects all of the data points in a line graph

TRUE

TF
A control is part of the experiment that the other results will be compared to.

false

TF
in most line graphs, the dependant variable is placed along the X-axis

3420

How many meters are in 3.42 kilometers?

0.253

how many grams are in 25.3 centigrams?

g/cm

which is not an appropriate unit for measuring density? g/cm
g/ml
kg/l
g/l

6

how many significant digits are in 530,405,000

0 kelvin

Absolute zero reffers to

compound

A chemical composition of two or more different elements joined together in fixed proportions isk nowns as a

physical property

The density of silver is 10.5 g/cm3. Density is an example of a

chemical change

A piece of wood burning is an exaple of a

the mass of reactants is equal to the mass of products

According to the Law of conservation of mass, in any chemical change,

chromatography

a homogenious mixture can be seperated by what method?

Definitie proportions

The Law of _____ states that a compound is always composed of the same elemensts in the same proportion by mass

Distilation

what is the seperation technique that relies on the different boiling points of the parts of the mixture?

false

tf
the term gas and vapor can be used interchangeably

falso

tf
a change of state is a chemical change because ice and water do not resemble one another

true

matter that has uniform and unchanging composition is called a pure substance

falso

when a chemical change occurs, the product has greater mass than the reactants

true

mixtures can be seperated by a series of physical changes.

false

compounds can be seperated into their component elements by a series of physical changes.

false

An intensive physical property is one that depends on the amount of matter present

hetero
homo
homo
hetero
hetero
hetero
homo

homogenious or heterogenious.
1) Snickers candy bar
2) salt water
3) air
4) chocolate chip cookie
5) vegetable soup
6) dirt and rocks
7) Kool-Aid

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