Chemistry Final!

If an atom loses two electrons what charge will it have?

+2

If an atom gains one electron what charge will it have?

-1

Balance this equation._CF4 + _Br2 -- _CBr4 + _F2

1,2,1,2

Balance this equation._CH4 + _O2 --> _CO2 + _H2O

1,2,1,2

Balance this equation._SnO2 +_H2-->_Sn +_H2O

1,2,1,2

4 Al + 3 O2 -> 2 Al2O3 How much aluminum would be needed to completely react with 45 grams of O2?

1.875 moles

How many electrons can the d sublevel hold?

10

The electron configuration of an atom is 1s22s22p6. The number of electrons in the atom is

10

2 KClO3 → 2 KCl + 3 O2How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?

10.1 mol

B2H6 + 3O2 -->2 HBO2 + 2 H2OWhat mass of O2 will be needed to burn 36.1 g of B2H6?

124 g O2

1 Cheese + 2 Bread --> 1 Grilled cheeseHow many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

13

What is the atomic mass of "F"

19

Which electron configuration belongs to Chlorine (Cl)?

1s2 2s2 2p6 3s2 3p5

What electron configuration matches an oxygen atom?

1s22s22p4

How many electrons can the s sublevel hold?

2

Mg + ___ HCl → MgCl2 + H2

2

Balance this equation_Al +_HCl --> _H2 +_AlCl3

2, 6, 3, 2

__ Al + __ FeO → Al2O2 + __ Fe

2,2,2

Cl2 + 2 KBr → Br2 + 2 KClHow many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?

223 g

Which problem is balanced?

2Na + 2H2O --> 2NaOH + H2

For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

3 mol MgO / 2 mol Fe

2H2 + O2 → 2H2OHow many moles of oxygen are consumed if 8 moles H2 are used?

4

How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3

4

The Formula to make S'mores is:2C + 1M + G2 → C2MG2. If you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?

4

PCl5 + ___ H2O → ___ HCl + H3PO4

4,5

2Na + 2H2O → 2NaOH+ H2How many grams of hydrogen are produced if 120 g of Na are available?

5.2 g

2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)12.00 moles of NaClO3 will produce how many grams of O2?

576 g of O2

How many atoms of carbon (C) are in C6H12O6?

6

What is the number of valence electrons for Oxygen?

6

an atom with atomic number 6 would have how many protons

6

CH4 + 2 O2 → CO2 + 2 H2OHow many moles of carbon dioxide are produced from the combustion of 110 g of CH4?

6.85 mol

How many atoms are there TOTAL in:H2SO4

7

How many valence electrons in this structure?

7

What is the number of protons that the element in this image contain?

7

SiO2 + 3C → SiC + 2COI need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?

96 g

Generally, the number of neutrons ____ the number of protons in an atom.

=

Which periodic table family could have electrons filling orbitals in the s-block?

Alkaine Earth

the element with the lowest electronegativity in period 3 is

Ar

list the following in order of weakest to strongest ionization energy. P, Cs,Co,Sr

CS,Sr,Co,P

Which of the following will have a higher electronegativity than arsenic (As)?

Carbon (C)

Which of the following elements has the smallest atomic radius?

Chlorine

the electronegativity of Cl is the highest in period 3. why?

Cl is the smallest and has the greatest effective nuclear charge

Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

Cl2

Always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water.

Combustion

C4H12 + O2 → CO2 + H2O

Combustion

Atoms joined together by SHARING electrons are?

Covalent bonds

2Pb(NO3)2 --> 2PbO + 4NO2 + O2

Decomposition

One reactant into several products.

Decomposition

What type of chemical reaction is this?Al(OH)3 → Al2O3 + H2O

Decomposition

Define a liquid.

Definite volume, indefinite shape

When a gas changes directly to a solid, the process is known as what?

Deposition

Ions in two compounds switch.

Double Replacement

The following is what type of reaction:PbCl2 + AgNO3 → Pb(NO3)2 + AgCl

Double Replacement

3KOH + H3PO4 --> K3PO4 + 3H2O

Double displacement

The element with the largest electronegativity in the halogens is -

F

Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl2.1 Mg + 2 HCl --> 1 MgCl2 + 1 H2

HCl

If I ride my bike to school instead of walking, then I will get to school faster. What is the dependent variable?

How fast you get to school

Will a construction paper air plane fly faster than an airplane made from notebook paper? Choose the best hypothesis.

If I make a paper airplane from notebook paper, then it will fly faster than construction paper.

How is a gas defined?

Indefinite shape, indefinite volume

pic

It remains the same.

Which side of a chemical equation is the reactant side?

Left (before the yields sign)

What atom matches this electron configuration?1s22s22p63s2

Magnesium

What does the Law of Conservation of Mass state?

Matter cannot be gained or lost in a chemical reaction.

who developed the periodic table?

Mendeleev

Which type of bond creates a "pool" of electrons between atoms?

Metallic Bonds

What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO?4 NH3+6 NO --> 5 N2 + 6 H2O

NH3

Which of the following has a full valence shell?

Neon

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

No

Which type of bond has an equal sharing of electrons?

Non Polar Covalent

1 P4 + 3 O2 --> 1 P4O6What is the limiting reactant if 12 moles of P4 react with 15 moles of O2?

O2

Which type of bond has an unequal sharing of electrons?

Polar Covalent

Elements on the LEFT side of the periodic table will most likely form:

Positive ions

The two sides of a chemical equation are called?

Reactants (left) and Products (right)

If I read this question carefully, then I will answer it correctly. What is the independent variable?

Reading or not reading carefully

Which side of a chemical equation os the product side?

Right (after the yields sign)

3Ca + 2AlCl3 --> 3CaCl2 + 2Al

Single Displacement

One element replaces another in a compound.

Single Replacement

What term describes a solid changing to a gas?

Sublimation

What is the little number after an element in a chemical equation called.Example: H2

Subscript

4Si + S8 --> 2Si2S4

Synthesis

The following is what type of reaction:NH3 + HCl → NH4Cl

Synthesis

Two Reactants and One Product

Synthesis

As you move down the periodic table atoms get bigger. This is because ____________.

The atoms have more energy levels

What happens when my glass of water is sitting in the sun and disappears into a gas?

What happens when my glass of water is sitting in the sun and disappears into a gas?

How are covalent bonds explained?

When the atom shares an electron with an another atom

When does a chemical reaction stop?

When the limiting reactant is used up.

Choose the correct shortcut configuration for iodine.

[Kr]5s24d105p5

Each row on the periodic table represents:

an energy level

Particles of a liquid

are free to move around one another but still touch.

Where is the element's atomic MASS located?

at the bottom

all matter is made of what

atoms

As you move across the periodic table atoms tend to get smaller because, ______________.

atoms have more protons

What is decomposition?

breaking substances apart

Which of the following will have a lower ionization energy than Scandium (Sc)?

calcium Ca

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

coefficient

the summary at the end of an experiment that explains the results

conclusion

This is the group that we will compare our experimental group to. This group stays "normal."

control group

the name of information that you get from your experiment

data

Atomic radius generally increases as we move __________.

down a group and from right to left across a period

Which subatomic particle has a negative charge?

electron

The tendency of an atom to attract electrons and acquire a negative charge

electronegativity

Which subatomic particles contribute the least to the mass of an atom?

electrons

Valence electrons are the number of

electrons in the outside shell of the atom

What subatomic particle(s) would be found orbiting the nucleus?

electrons only

The energies of electrons as they orbit the nucleus of an atom

energy levels

this is the group that is affected by the independent variable or the group that is changed

experiemntal group

Testing hypotheses often involves

experiments

All chemical bonds involve two atoms sharing electrons.

false

The chemical bond formed when two atoms share electrons is called a(an) IONIC bond.

false

you hypothesis can never be wrong

false

Which is NOT a step in the scientific method?

form a theory

which atom has the largest atomic radius

francium

What term describes a liquid changing to a solid?

freezing

______________________ takes place when a liquid changes to a solid.

freezing

Particles (molecules) in a ______________________ have more energy than the other states of matter.

gas

The state of matter that has no definite size or shape is

gas

electronegativity is

how good an atom is at attracting electrons

ionization energy is

how much energy it takes to remove an electron from an atom

A testable explanation to a problem that has not yet been tested.

hypothesis

If you increase the amount of spinach you eat, then you will increase the iron in your blood. What's the dependent variable?

increase the amount of iron in your blood

As you look from left to right across a period, electronegativity

increases

Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.

increases,decreases

the variable in an experiment is the one being changed by the scientist

independent

Which type of bond has a transfer of an electron from on atom to another?

ionic

A bond that forms when electrons are transferred is called a/an

ionic bond

the minimum energy required to remove an electron from the ground state of an atom

ionization energy

Bonds that form between two metals are called ______________ bonds.

metallic

Which subatomic particle has a neutral or no charge?

neutron

Energy levels are denoted by:

numbers

in a controlled experiment how many variables can be worked with at a time

one

When 12 moles of O2 reacts with 6 moles of C10H8, what is the limiting reactant?1 C10H8 + 12 O2 --> 10 CO2 + 4 H2O

oxygen

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

peanut butter

When electrons are shared unequally a/an ___________ bond is formed

polar covalent

Which subatomic particle has a positive charge?

proton

The atomic number of an elements is the total number of which particles in the nucleus?

protons

Which subatomic particles contribute the most to the mass of an atom?

protons and neutrons

What are the 3 subatomic particles of an atom?

protons, neutrons, electrons

a series of steps designed to help you solve problems or answer questions

scientific method

Covalent compounds

share electrons

Chemical bonds form when atoms

share or transfer electrons

What type a reaction is taking place in this picture?

single replacement

Molecules are closest together in a

solid

Which form of matter does not take the shape of its container?

solid

Which state of matter has the lowest compressibility?

solid

f I study for my scientific method test, then I will have a better test score. What is the dependent variable?

test score

Where is the element's atomic NUMBER located?

top

An ionic bond forms when atoms ___________ electrons.

transfer

Which area on the periodic table represents the electrons in the "d" sublevel?

transition elements

After you write your conclusion, it is important to share your results with others.

true

There are 4 different types of subshells (orbitals) s,p,d,f.

true

Water can be a solid, liquid, and a gas.

true

You use the scientific method all the time to solve everyday problems.

true

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

type of liquid

The limiting reactant . . .

used up first

dependent variable means

what is being measured

Is this equation balanced?

yes

What atom matches this electron configuration?1s22s22p63s23p64s23d10

zinc

Which of the following is not a correct designation for a sublevel?

zz