Chem Tests
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
