-
Mega is the SI prefix for what?
million
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How close the value is to the true value is called what?
accuracy
-
Metals, nonmetals, ad semiconductors are the three main groups of...
elements
-
Semiconductors conduct...
electricity and heat under certain conditions
-
J, N.m, kg. m2/s2 are units of what?
work
-
What happens to energy during evaporation?
absorbed
-
Magnetic fields are produced by electric...
currents
-
A measurement that is accurate is close to its....
true value
-
Give examples of compounds.
sugar, salt, water
-
Energy can be transferred as...
heat
-
Give an example of double displacement reaction.
switch their compound
-
How many atoms are in the compound 2NaO2?
6
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A star is born as a ________ and ________ cloud.
gas and dust
-
Atomic mass is...
the atom's mass
-
The atomic number is...
the number of protons
-
All weather occurs in the ___________ part of our atmosphere.
troposphere
-
Define temperature.
the measure of the average heat of a particle
-
amu stands for...
atomic mass unit
-
Signs that a chemical change has taken place are...
odor, color, light, heat, sound
-
Compounds and element represent...
pure substances
-
Name 6 simple machines.
lever, pulley, wedge, wheel and axle, screw,and inclined plane
-
Particles of the same temperature move at different speeds if their _______ are different.
masses
-
For solutes to dissolve quickly name 3 things you can do.
heat, stir, crush
-
On a ph scale, where are acids?
0-7
-
On a ph scale, where are neutrals?
7
-
On a ph scale, where are bases?
7-14
-
Define sublimation.
solid to a gas
-
State the 4 states of matter.
solid, liquid, gas, plasma
-
.01 can also be expressed as...
10-2
-
Give examples of mixtures.
salad dressing and chocolate milk
-
Give examples of mixtures.
salad dressing and chocolate milk
-
In a chemical reaction, atoms are...
rearranged
-
Energy is released when ice melts to form a...
liquid
-
Define weight.
pull of gravity
-
The ___________ theory helps to explain the differences between states of matter.
kinetic
-
The ____________ theory states that the universe began with a gigantic explosion.
The Big Bang
-
An equation must be balanced to show that....
mass is conserved
-
Define molecule.
a group of atoms that act as a unit
-
What is the scientific method?
a series of steps
-
The kinetic theory stte when temperatures are high, the particles move....
faster
-
Chemical changes can only be reversed by....
chemical changes
-
In stars, energy is released as a result of...
fusion reactions
-
At the freezing point, substances change from a liquid to a ___________.
solid
-
Where do earthquakes occur?
at plate boundries
-
Negative acceleration occurs when an object...
slows down
-
Magnetic fields are produced by....
electric currents
-
Good conductors of hear are...
metals
-
Anything left running for long periods of time becomes hot due to the transfer of ...
energy
-
Knowing the chemical properties of a substance tells you how it _________with others.
reacts
-
_______ electrons determine an atom's chemical properties.
valence
-
The particles of solids, liquids, and gases are in constant...
motion
-
______ and _______ determine the speed of atoms and molecules.
size of particles and temperature of substances
-
A screwdriver is an example of what type of simple machine?
wheel and axle
-
What is the difference between speed and velocity?
direction
-
Alkali metals are highly reactive because they have _____ valence electron(s).
1
-
Speed formula...
speed = distance divided by time
-
There is an attraction when charges are ______.
opposite
-
Solids, liquids, gases have mass, _______, and are made of __________.
take up space........atoms
-
Solids, liquids, and gases are in .....
constant motion
-
Explain a synthesis reaction.
2 elements combine and form a compound
-
Describe ionic and covalent bonding.
- ionic = transferred
- covalent = sharing
-
What is negative acceleration?
changes direction
-
Momentum =
mass x velocity
-
Elements in the same family have similar _______ and _______.
chemical properties and appearance
-
What is negative acceleration?
changes direction
-
Bases are...
bitter, slippery, and turn blue
-
The second element in an ionic compound ends in...
ide
-
Elements that share properties of metals and nonmetals are...
metalloids
-
As elements move from left to right across the periodic table they become less...
metallic
-
A net force of zero means objects remain ________ and are ____________.
at rest ......balanced
-
Law of Conservation of Mass...
Mass cannot be created nor destroyed
-
Example of homogeneous mixtures is...
soft drinks
-
Example of heterogeneous mixture is...
salad
-
Name families on the periodic table.
noble gases, earth, alkalide,....
-
Efficiency is the ratio of ....
useful work output to work input
-
Chemical equations can only be balanced by changing or adding what?
coefficients
-
What are some units of power?
watts, joules, horsepower
-
When a gas increases in _______, it increases in pressure.
temperature
-
Who published the first periodic table?
Mendeleev
-
Valence electrons determine at atom's ________.
chemical properties
-
Waves travel the quickest through...
solids
-
An electron motor converts electric energy into ____________energy.
mechanical
-
Which state of matter is not a fluid?
solid
-
Which states of matter form solutions?
gas-liquid.....solid-liquid....solid-solid
-
What increases in an exothermic reaction?
temperature
-
Electrons on the periodic table are related by ___________ arrangement.
electron
-
An explanation that has been tested by many observations is a __________.
scientific theory
-
The opening of a skydiver's parachute explains what?
air resistance
-
An object accelerating near earth's surface are in _____________.
free fall
-
Chemical bonds hold ___________ and _______ together.
atoms ......ions
-
Light travels as _________ waves.
electro magnetic
-
Medium for sound waves...
air
-
Medium for water waves...
water
-
Medium for seismic waves...
earth
-
Gravitational potential energy depends upon _______, ________ of object, and ___________.
height.....mass....acceleration due to gravity
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