Chem Tests

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H2O2 => H2O + O2

Decomposition

Na + Cl2 => NaCl

Synthesis

AgBr + GaPO4 => Ag3PO4 + GaBr3

double replacement

The SI base unit for energy is

joule

The number of electrons present in the ion MG+2 is

10

how many hyrdogen atoms are indicated in the formula (NH4)2C8H4O2

12

The symbol for the isotope Carbon -13 is _____

13 (top) 6 (Bottom) C (right)

How many atoms are represented by one formula unit of aluminum dichromate, Al2(Cr2O7)3

29

If the mass number of an elemtn is 81, and the atomic number is 35, how many electrons does the atom have>

35

the number of neutrons present in Cesium -132

77

The weighted average mass of all the isotopes of an element is called_____

Atomic Mass

The weighted average mass of all the isotopes in an element is called ____

Atomic mass

A flashlight battery corrodes

Chemical Change

Stomach acids digests food in your stomach

Chemical Change

The sulfur in eggs turns a silver spoon Black

Chemical Change

which of the following is not a classification of chemical reactions? Decomposition, Divisional, Single replacement, combustion, synthesis.

Divisional

a compound, containing 2 hydrogen, 1 sulfur, and 4 oxygen should be written _____

H2SO4

Homogenious mixtures

Have a constant compostion, are called solutions, and are alloys.

the most common elements found in living things are _____

Hyrdogen, oxygen, and carbon

The most abundant element in the universe is ____

Hyrdrogen

the scientist who developed the "plum Pudding Models" was ?

JJ Thompson

The scientist who discovered the presence of the electron is

JJ thompson

Important laws for chemistry?

LAw of definite proportions,conservation of mass, and multiple proportions.

sequence of steps for the scientific method is

Observation, hypothesis, experiments, draw conclusions.

AN aom that has 15 protons and 16 neutrons is an atom of

P

Boiling water changes to a vapor

Physical Change

Mothballs gradually vaporize in a closet

Physical Change

the scientist who performed "Gold Foil Experiment" was______

Rutherford

al + Fe3N2 => AlN + Fe

Single replacement

C2H4O2 + O2 => CO2 + H2O

Single replacement and combustion

what is a chemical reaction in which two or more substances react to produce a single product?

Synthesis

The number of protons in the nucleus of an atom is called ____

atomic number

all matter is composed of small particles called ____

atoms

the law of conservation of mass states that

atoms can be neither created nor destroyed

if we wanted to calculate the percent by mass for an element within a compound, we would need to know the mass of the element, and the mass of the _____

compound

the best separation technique for separating homogenious mixtures is

crystallization

NaClO3 => NaCl + O2

decomposition

"regardless the amount, a a compound is always composed of the same elements in the same proportions by mass" is known as the law of ______ Proportions

definite

intensive physical properties include?

density, melting & boiling point.

the best separation technique for for separating a liquid solution made of substances that have different oiling points is

distillation

(NH4)3PO4 + Pb(NO3)4 => Pb3(PO4)4 + NH4NO3

double replacement

H2O + CO2 => C7H8 + CO2

double replacement

NaNO3 + Pbo => pb(No3)2 + Na2O

double replacement

the smallest of the subatomic particles is the _____

electrons

soft subtsances like wax are not considered to be solids T?F

false

the least common element on earth is _

francium

the state of matter that has both a variable shape and a variable volume is

gas

What element does not occur in nature as a diatomic molecule?

helium

what prefix indicates 10 to the 3 or 1000?

kilo

types of energy?

light, chemical, electricity, heat.

the Si base unit for the amount of a substance is a

mole

The study of carbon containing compounds

organic chemistry

the most common elements in the earths crust are

oxygen, hydrogen, and silicon

Ag is the symbol for

silver

C10H16 +Cl2 => C + HCl

single replacement

C3H8 + O2 => CO2 + H2O

single replacement and combustion

S8 + O2 => SO2

synthesis and combustion

an electron carries negative charge T/F

true

extensive physical property>

volume


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