PSH Quizziz Study Guide Midterm
15.6 L = ___________ mL
15,600
How many valence electrons does an alkaline earth metal have?
2
If this equation is balanced, what number would go before OF? ___ F2 + ___ O2 --> ___ OF
2
Write 7.8 x 10 3 in standard form.
7,800
What is this number in scientific notation? 7,100, 000, 000
7.1 x 10 9
Convert this number to standard notation: 7.1 x 104
71,000
How many kilograms of calcium are there in 173 pounds of calcium? (1 pound = 454 grams; 1 kg = 1000 g)
78.5 kg
How many spaces and which way would you move the decimal to convert this number to scientific notation? 0.000000034
8 to the right, because there must be one number to the left of the decimal point that is more than 0 but less than 10
Gas costs $3.05 a gallon, and your car travels at 27 miles for each gallon of gas. How far can you travel in your car with $95 in your pocket?
840 miles
Convert this number into scientific notation: 950,000
9.5 x 10 5
At which point is the substance a solid?
A
What is an ion?
A charged atom
What type of reaction is NaCl + Fe(SO4) --> Na2(SO4) + FeCl2?
Double replacement
Which happens last?
Draw conclusions
Which Bohr model represents sodium?
Na
Which of the following is an example of an IONIC COMPOUND?
NaCl
What is an dependent variable?
What scientist measure to see if it responded to a change
What is a control?
What you keep the same throughout all experimental groups
2 or more different elements that are bonded together is called...
compound
Carbon Dioxide (CO2)
compound
Water (H2O)
compound
What you learned from the experiment is the ___.
conclusion
The reverse of vaporization is
condensation
Something that you keep the same in an experiment is called a(n)
control
What type of bond forms when 2 or more electrons are SHARED?
covalent bond
What subatomic particle(s) would be found orbiting the nucleus?
electrons only
Ca (calcium)
element
One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?
evaporation; physical change
Matter with no definite volume and no definite shape is a ____.
gas
The vertical (up and down) columns in the Periodic Table are called
groups
What type of matter is air?
homogeneous mixture
A testable explanation to a problem that has not yet been tested.
hypothesis
As per Charles' Law if temperature of any gas is increased its volume will -
increase
The _____ _______ is the factor that you purposely change or control in order to see what effect it has.?
independent variable
What type of bond is this? Lithium with Fluorine?
ionic
What type of bond forms between two or more atoms that are charged (+/-)?
ionic bond
Which of the following is a transition metal?
iron
Which SI unit is used to measure mass?
kg
If you conduct an experiment where you place 5 of the same red candies in different types of soda, all in the same amount of liquid and same type cups the indipendent variable is what?
kind of soda
Matter that has a definite volume but no definite shape is a ______.
liquid
Which SI unit is used to measure length?
m (meter)
Anything that has mass and takes up space is called
matter
Classify the following: Mystery Substance X is an electrical semiconductor, somewhat dull and brittle, a solid at room temperature and it conducts heat at times.
metalloid
Elements that lie along the stair-step line of the periodic table are ______.
metalloids
H2 is an example of a(n)...
molecule
Chemical symbol represents the _________ of an element.
name
An atom becomes _________ when it gains electrons.
negative
Anions are ______.
negative
An atoms overall charge is
neutral
Particles in an atom that are neutral and have no charge are
neutrons
The central region of an atom where its neutrons and protons are is its
nucleus
How many independent variables should you have in an experiment?
one
At higher temperatures
particles in an object move faster
Horizontal rows of the periodic table are called _________.
periods
Physical or Chemical Change? Making a paper airplane.
physical change
Water freezing into ice is an example of a...
physical change
Blue Color: Chemical or Physical Property
physical property
Solubility (dissolves): Chemical or Physical Property
physical property
An atom becomes _______ when it loses electrons.
positive
Cations are _______.
positive
Which subatomic particle is responsible for element identification?
proton
The positive particles of an atom are
protons
In which state of matter are the forces of attraction among the particles is so that they can only vibrate?
solid
Matter that has a definite volume and a definite shape is a ____.
solid
What TWO things make a solution? Select BOTH that apply on test
solute solvent
You have been injured in the laboratory (cut, burn, etc.). First you should
tell the science instructor at once
Which of the following indicates a chemical change?
temperature change
To put out a fire on a person's hair or clothes, use:
the fire blanket
You are heating a piece of glass and now want to pick it up. You should
use tongs
All factors that can change in an experiment.
variables
Sodium (Na) is found in group
1
What charge do you use for a proton?
+
What charge do you use for a electron?
-
Express the following in standard notation: 8.025 x 10-8
.00000008025
Name the compound: NaCl
sodium chloride
Which conversion fraction would be needed from this starting amount? 528 ft. Convert to miles
1 mile ————- 5280 ft.
A child weighs 40.0 lb and is to receive 0.10 mg of an antibiotic for each kg of body weight. How many milligrams of the antibiotic shall the child receive? 1 kg = 2.2 lbs
1.81 mg
At what temperature did bread mold the fastest?
100
Frank has an eraser. It has a mass of 4g, and a volume of 2cm3. What is its density?
2 g/cm3
What two types of atoms make a covalent bond?
2 nonmetals
240 cm = ___________ m
2.4
At what temperature did bread mold the slowest?
20
If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?
20
You know 1000 mg = 1 g. Convert 2.5 grams into milligrams.
2500 mg
Sodium (Na) is found in period
3
What is the atomic number for an element with 3 protons?
3
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
3 g/cm3
3 km = ___________ mm
3,000,000
How many neutrons does the isotope of lithium have?
5
55 mm = ___________ cm
5.5 cm
56 L = ___________ mL
56,000
An atom with atomic number 6 would have how many protons
6
Write 6,700 in scientific notation.
6.7 x 10^3
Convert this number into scientific notation: 0.068
6.8 x 10^-2 6.8 x 10 -2
Which of the following is an example of a heterogenous mixture?
A salad with lettuce, olives, and tomatoes
An Arsenic atom wants to form...
An anion
Which of these contains steps in the right order?
Ask a question, research, state your hypothesis, experiment, analyze, draw a conclusion
What is the first step in the scientific method?
Ask a question/make an observation
At what point(s) is a phase change occuring?
B and D
Point "B" is known as the:
Both freezing and melting point
Which of the following is a Halogen?
Bromine
At which point is this substance a liquid?
C
The chemical formula of carbon tetrachloride is
CCl4
carbon monoxide
CO
Which of the following is an Alkaline Earth Metal?
Calcium
A change in matter that forms one or more new substances with new chemical properties is a/an...
Chemical change
Which of the following is not a compound?
Cl
Ammonia (NH3)
Compound
A student can pick up any broken glass as long as they throw it in the trash.
False
The burning of wood is a physical change
False
True or False: Neutrons have a negative charge
False
Why are goggles an important part of lab safety equipment?
Goggles protect our eyes from chemicals and foreign objects.
The noble gases are in ______.
Group 18
Which of the following is an example of a COVALENT COMPOUND?
H2S
Sweet Tea, everything is mixed evenly and looks the same.
Homogeneous mixture
Your sister made you a glass of Kool-Aid, which was awfully nice, but it taste very weak.
Homogeneous mixture
Which of the following lists only elements?
K, Cl, N
Which of the following is a Noble Gas?
Krypton
Which is the third step?
Make a hypothesis
In a laboratory, the following should NOT be worn
Open toed shoes
The trees outside of the school have large, green leaves growing on them. Is this a Qualitative Observation, Quantitative Observation, or an Inference
Qualitative Observation
7.82 x 10-6 is an example of scientific notation. The exponent of -6 tells you your number will be very ________.
Small
Which of the following is an Alkali Metal?
Sodium
The following is NOT a step in the scientific method.
State a theiryy
I want to know if low strength bleach, medium strength bleach, or maximum strength bleach will get Heinz ketchup stains out of white T-shirts the best. What is the variable in this experiment?
The strength of the bleach
What is the correct name for C3H6?
Tricarbon hexahydride
True or False: Never remove chemicals, specimens, or other equipment from the laboratory
True
What is an independent variable?
What a scientist changes in an experiment to test their hypothesis
Which of the following is the most reactive group of metals?
alkali
If you are testing the buoyancy (galleggiabilità) of a cotton ball and you leave one plain, cover one half in oil, and cover the third in oil completely then place each in water, what is the independent variable?
amount of oil
If you do not understand a direction or part of a lab procedure, you should
ask the teacher
What does 12.011 represent?
atomic mass
What does the 1.00794 stand for?
atomic mass
In the modern periodic table, elements are arranged by:
atomic number
What does the 6 represent? Carbon 6 C 12.011
atomic number
What do these isotopes of carbon all have in common?
atomic number and electrons
All matter is made of what
atoms
Ions are formed when...
atoms lose or gain electrons
You are heating a substance in a test tube. Always point the open end of the tube
away from all people
Flammability (burns): Chemical or Physical Property
chemical property
UNDERSTANDING: The first number in scientific notation must not be...
between and including 1 and 9.9999
Which of the following is not a chemical property?
boiling
A change that alters the physical properties of a substance without changing its composition.
chemical change
Physical or Chemical Change? Baking a cake.
chemical change
Physical or Chemical Change? Iron rusts
chemical change
Horseplay or practical jokes in the laboratory are
dangerous and could cause harm and invalidate the experiment
The information you collect while doing your experiment is called
data
What type of reaction is represented?
decomposition
According to Boyle's law, at constant temperature, as the pressure of a given sample of gas is increased, the volume will -
decrease
As temperature increases, the time for the bread to mold
decreases
Name the compound: H2O
dihydrogen monoxide
Name the compound: P2F5
diphosphorus pentafluoride
During a phase change, the temperature...
doesn't change
Metals can be used as wire because they are _______.
ductile
A particle that moves around the nucleus is a(n)...
electron
A(n) ___________________________ is what you can learn about an object by using your 5 senses.
qualitative observation
A series of steps used by scientists to solve a problem or answer a question.
scientific method
To make observations you use your _______.
senses
When using scientific notation, a positive exponent means ...
the standard number is greater than one
A mixture ---
• has 2 or more ingredients • maintains their physical properties • easy to separate D. all of the above
What three factors increase the rate of solubility?
• small particle size • increase of temperature • stirring
What charge do you use for a neutron?
∅
