chemistry exam

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

How many carbon atoms are in sucrose? the chemical formula is C12H22O12.

12

When ammonium nitrate explodes, the products are nitrogen, oxygen, and water. When 40 grams of ammonium nitrate explode, 14 grams of nitrogen and 8 grams of oxygen form. How many grams of water form?

18 grams

Solve. (7.2 x 10^-4) / (3.6 x 10^3)

2.0 x 10^-7

The freezing point of water is 0°C, or_______ on the Kelvin scale

273.15

Solve. (4.3 x 10^4) + (1.3 x 10^4) =

5.6 x 10^4

How many valence electrons are in halogens

7

How could you distinguish an element from a compound?

A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds.

What is the chemical symbol for silver?

Ag

Aluminum Nitrate

Al(NO3)3

Aluminum hydroxide

Al(OH)3

An atom or group of atoms with a positive or negative charge is called

An ion

A negatively charged group of atoms is called

Anion

Describe the relationship between wavelength and frequency

As the wavelength of light increases, the frequency decreases. Wavelength is the distance between the crest. Frequency is the number of waves cycles to pass a given point.

Why would carbon and silicone have similar properties

Because they are the same. And they have some similarities

What is required to break a bond between two covalently bonded atoms

Bond dissociation energy

Give an example of a halogen element

Br, I, Cl, F

What is the chemical symbol for carbon?

C

CO2S3

Cobalt (III) Sulfide

What are bonds that are in molecular compounds that form by sharing electron pairs.

Covalent bonds

Metal atoms arranged in very compact and orderly patterns

Crystalline structure

Copper(II) sulfide

CuS

Express the formula for finding density

Density= mass/volume

N2O3

Dinitrogen Trioxide

What is a basic rules governing the filling Of atomic orbitals by electrons

Electrons occupy the lowest possible energy level, and atomic orbital can hold at most two electrons, one electron occupies each of a set of overdose with equal energy before any pairing of electrons occurs

True or false. An oxygen molecule contains a triple covalent bond

False

True or false. Nonmetals lose electrons to form anions.

False

True or false. When an electron absorbs a quantum of energy, it gives off energy in the form of color.

False

Iron (II) oxide

FeO

Fluorine has a smaller atomic radius and both oxygen and chlorine because of?

Flooring has a smaller atomic radius and actually because fluorine has a larger nuclear charge and because fluorine has fewer energy levels

What is the most electronegative element on the periodic table?

Fluorine

What is the chemical symbol for hydrogen?

H

which noble gas does not have eight electrons in its highest occupied energy level?

He

Write the symbols of the noble gases

He, Ne, Ar, Kr, Xe,

Provides warmth on earth

Infrared

what studies non carbon based chemicals in rocks

Inorganic chemistry

What what is the strongest bond?

Ionic bonds

Fe2O3

Iron (III) Oxide

Atoms of an element having different numbers of neutrons are called

Isotopes

tell how electronegativity changes as you go across the periodic table from left to right. Tell how it changes as you go from top to bottom.

It decreases from left to right and increases going from top to bottom.

Why is air classified as matter?

It has mass and takes up space

Potassium nitride

K3N

Potassium Phosphate

K3PO4

Potassium phosphate

K3PO4

Write the symbols of the group 1A metals

Li, Na, K, Rb, C, Si, Fr

Explain briefly why metals are good conductors of electricity

Metal particles are held together by strong metallic bonds that have high melting and boiling points. Free electrons can move through medals because of this.

Bonds that are holding metals together

Metallic bonds

Would you expect metals or nonmetals in the same period to have higher ionization energy

Metals

Usued in the kitchen for cooking

Microwave

The melting point of a compound is 240°C. Is this compound most likely an ionic or a molecular compound?

Molecular

Nitrogen dioxide

NO2

Of Mg and Na which would have the smaller atomic radius?

Na

sodium nitrate

NaNO3

sodium sulfide

NaS

Explain why neon is monatomic but chlorine is diatomic

Neon has a complete outer electron orbitals shelf. Chlorine has one less they complete outer orbital shell

Atoms and ions with the same number of electrons are called isoelectronic. Is it possible for a cation to be isoelectronic within anion from the same period?

No

What is the chemical symbol for oxygen?

O

tetraphosphorus decaoxide

P4O10

What is the chemical symbol for lead?

Pb

Classify each of the following as physical or chemical changes. Water Boils? Salt dissolves in water? Milk turns Sour?

Physical, physical, chemical.

Reactants Na and Cl combine in a chemical reaction to form NaCl, Sodium Chloride. NaCl is called the _________ of the reaction

Product

Communication

Radio waves

Sulfur hexafluoride

SF6

Sulfur trioxide

SO3

Tin (IV) nitrite

Sn(NO2)4

Explain why NaCl in solution conducts electricity although solid NaCl will not.

Solid NaCl maintains a crystalline structure that does not have free electrons as in the lattice structure of metals. But when dissolved in water, the crystalline structure is broken down and the salt molecules become ions.

As the temperature rises, which solid will melt before mercury boils?

Sulfur

Define the term absolute zero

The lowest temperature that is theoretically possible

The electron configuration achieved by atoms when they share electrons to form covalent bond is called?

The noble gas configuration

Describe the difference between an ionic bond and a covalent bond

Their difference is structure and properties. Covalent bonds consist of pairs of electrons shared by two Atoms and binding together in a fixed orientation. An ionic bond is a bond between a cation and an anion

Used for tanning skin and growing plants

Ultraviolet light

Helps us see things

Visible light

Taking pictures of the interior of the body

X-ray

Yes or no. Based on their locations in the periodic table, would you expect carbon and silicone to have similar properties

Yes

What is the name of the element for each chemical symbol? Al Hg F S Mo Cu

aluminum mercury fluorine sulfur molybdenum

Al(ClO3)3

aluminum chlorate

Al2O3

aluminum oxide

what measures the level of lead in blood

analytical chemistry

What investigates changes that occur as food is digested in the stomache

biochemistry

Ca3(PO4)2

calcium phosphate

A positively charged ion is called

cation

List three ways that matter is meaured

count, volume, mass

a molecule consisting of two atoms

diatomic molecule

N2O4

dinitrogen tetraoxide

What colorless substance is a liquid at -30 C?

ethanol

True or false. When an electron absorbs a quantum of energy, it gives off energy in the form of color.

false

True or false. You perform an experiment and find the results do not agree with am accepted theory. You should conclude you made an error in your procedure

false

Are ice cubes in liquid water homogeneous or heterogeneous?

heterogeneous

Are mashed, unpeeled potatoes a homogeneous or a heterogeneous mixture?

heterogeneous

Is chocolate chip ice cream a homogeneous or heterogeneous mixture

heterogeneous

Is food coloring homogeneous or heterogeneous?

homogeneous

The melting point of a compound is 1240 degrees celsius. Is this compound most likely an ionic or molecular compound?

ionic

Atoms of an element having different numbers of neutrons are called what?

isotopes

PbF2

lead (II) fluoride

PbCl4

lead chloride

MgCO3

magnesium Carbonate

The law of conservation of mass means?

mass is conserved in any physical change, mass is conserved in any chemical reaction, mass is neither created or destoyed.

Which metal ions tend to have a color in solution.

metal ions with partially filled d orbitals

What colorless substance is a gas at 60 C?

neon

What studies carbon-based chemicals in coal

organic chemistry

Explains the energy transfer that occurs when it melts

physical chemistry

KCl

potassium chloride

What two physical properties could be used to separate iron filings from table salt?

put both in water and filter the resulting mixture. or you can use a magnet

In the chemical reaction Na+ Cl+--> NaCl, the substances on the left side of the equation are called ___________, and the substances on the right are called the_____________.

reactants, products

Na2CrO4

sodium chromate

SrC2O4

strontium oxalate

What substance is a solid at 7 C?

sulfur

Define electronegativity

the ability that atoms can attract electrons when the atom is a compound.

Why would we expect carbon and silicon to have similar properties?

they have the same amount of valence elctrons

Sn3(PO4)4

tin (IV) phosphate

SnS2

tin (IV) sulfide

True or False. Nonmetals gain electrons to form anions

true

Yes or No. Based on their locations in the periodic table, would you expect carbon and silicon to have similar properties.

yes


Kaugnay na mga set ng pag-aaral

Autoimmune and Arthritis Billings Questions

View Set

MCCC PSY 101 FINAL EXAM WINTER 2020

View Set

Joint Play Assignment Q's MHVicars

View Set

Chapter 13 The cost of production

View Set

THE MUSCULAR SYSTEM EXAM STUDY GUIDE

View Set