Answer:
emissions by factories is the answer
Explanation:
Factories produce air pollution which is polluted air, the other options
decay of organisms, photosynthesis (convert light energy into chemical energy - and returns CO2), and cellular respiration are all of the ways carbon dioxide returns to the atmosphere.
Hope this helped! Have a nice day, be safe and healthy :)
In a nuclear reaction, which of the following must be conserved?
A. energy
B. mass
C. charge
D. the number of electrons
Answer:
A. Energy must be conserved in a nuclear reaction
Explanation:
Answer:
Explanation:
In a nuclear reaction, which of the following must be conserved?
A. Energy
The process by which complex compounds are broken down by enzymes and by which many organic alcohols are formed is called
Answer:
fermentation
Explanation:
Why did the United States government set aside land for the first national parks?
A.
They wanted to settle the west as quickly as possible.
B.
They worried people would destroy the animals and land.
C.
They worried Native Americans wouldn’t have anywhere to go.
D.
They wanted to make sure all citizens would get a piece of land.
Answer:
b
Explanation:
hope it helps
Correct name of the compound
Answer:
Calcium Nitride
Explanation:
Static electricity is the buildup of electric charges. Which of the following is an example of the natural discharge of static electricity?
A.
ocean waves
B.earth's magnetic poles
C. northern lights
D. lightning
If is known how deep the water table in an area is, it is known how deep to dig to reach
Pores
The unsaturated zone
Solid rock
Groundwater
Answer:
grond water
Explanation:
Please help I don’t understand
what is the shortest half life
Answer:
Hey!
Your answer is element A
Explanation:
Using the graph, the element A's emission of radioactive particles ends approximately after 6 years...
A HALF-LIFE IS "HALF" OF THAT TIME PERIOD!
So if the radiation goes for 6 years the half-life is 6 divided by two which gives you 3 years!
The rest however have a longer half-life...
Because they all end at 14 yrs so their half-life in 7 years!
HOPE THIS HELPS!!
measure the mass of a truckful of grain, use:
kiloliters
kilometers
grams
tons
Help
Answer:
tons
Explanation:
2NaOH + H2SO4 > Na2SO4 + 2H2O
If you begin with 100 g of each reactant, how many moles of water will be formed?
Answer:
To calculate the number we need molar mass.
What is the volume of 9.5 g fluorine gas, F2, at STP?
Answer:
5.6L
Explanation:
At STP, the pressure and temperature of an ideal gas is
P = 1 atm
T = 273.15k
Volume =?
Mass = 9.5g
From ideal gas equation,
PV = nRT
P = pressure
V = volume
n = number of moles
R = ideal gas constant =0.082J/mol.K
T = temperature of the ideal gas
Number of moles = mass / molar mass
Molar mass of F2 = 37.99g/mol
Number of moles = mass / molar mass
Number of moles = 9.5 / 37.99
Number of moles = 0.25moles
PV = nRT
V = nRT/ P
V = (0.25 × 0.082 × 273.15) / 1
V = 5.599L = 5.6L
The volume of the gas is 5.6L
Which statements correctly describe the rock cycle? Check all that apply.
Rocks are preserved through the process.
Rocks change from one type to another.
Different rock groups are interrelated.
Rocks change from one type to another in a specific order.
Environmental conditions influence a change in rock type.
Answer: I italicize for checking
Rocks are preserved through the process.Rocks change from one type to another.Different rock groups are interrelated.Rocks change from one type to another in a specific order.Environmental conditions influence a change in rock type.
Explanation:
Rocks are preserved, as in you can't destroy them completely, but no, they don't stay the same they change.
why is maple syrup more diluted than maple sap
a _____ is substance in which one or more atoms have the same number of protons (I.e. the same atomic number)
Answer: Element
Explanation:
Answer: a proton is substance in which one or more atoms have the same number of protons
What is the wavelength of a light frequency 7.21x10^14Hz
Answer:
6.0 x 105
Explanation:
Answer:6.0 x l05
Explanation:
Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?
higher temperature → more kinetic energy → more space between particles – higher volume
higher temperature → less kinetic energy → less space between particles higher volume
o higher temperature → more kinetic energy → less space between particles → lower volume
higher temperature → less kinetic energy → more space between particles lower volume
Answer:
higher temperature → less kinetic energy → less space between particles higher volume
Explanation:
Boiling water is an example of what type of what type of thermal energy transfer?
convection
conduction
insulation
radiation
Answer:
Conduction
Hot water is conducting heat because it is moving
Boiling water is an example of conduction heat transfer (option B).
What is heat transfer?Heat is one of the various forms in which energy can exist. Heat transfers with or without medium from one place to another.
There are three ways in which heat is transferred in the environment;
ConductionConvectionRadiationConduction is the conveying of heat or electricity through a solid material such as the material used to boil water in this case. Therefore, option B is correct.
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Describe how alleles and genes are related.
Answer:
A gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more alternative forms; an allele is one of these forms of a gene. Chromosomes occur in pairs so organisms have two alleles for each gene one allele in each chromosome in the pair.
help asap plzzz! Which of the following diagrams is the correct electron dot diagram for S?
Answer:
A.
Explanation:
Sulfur has 6 valence electrons, therefore has 6 dots.
- Hope that helps! Please let me know if you need further explanation.
The correct option is A.
What is a dot diagram?
A Lewis electron dot diagram (or electron dot diagram, or a Lewis diagram, or a Lewis structure) is a representation of the valence electrons of an atom that uses dots around the symbol of the element. The number of dots equals the number of valence electrons in the atom.
Why do we use electron dot diagrams?These diagrams are helpful because they allow us to show how atoms are connected, and when coupled with Valence Shell Electron Repulsion Theory (VSEPR), we can use Lewis structures to predict the shape of the molecule.
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You take a very hot block of metal on top of a cold block of metal. What will
happen to the temperature of both blocks over time?
Answer:
They will both cool down overtime
Explanation:
Once you put something that is hot on something that is cold. They will both be hot, but overtime they will cool down. It can't stay hot forever.
Answer:
Hey!
Your answer is that one block of metal (the cold one) would heat up a bit whilst the other block (the hot one) would cool down...This is because of the metal's CONDUCTIVITY!
Explanation:
Eventually you would measure the temperature of both blocks and they will reach the same temperature. After this they will naturally cool down...
HOPE THIS HELPS!!
When you hammer a nail, which types of energy are you using? Select all of the correct answers.
potential energy
physical energy
kinetic energy
mechanical energy
Answer:
U using kinetic energy
how does the Doppler effect related to the universal expanding?
PLEASE HELP ME ASAP WITH THIS QUESTION!
Which factors describe a Mediterranean climate? Check all that apply.
has very few trees
is found in inland areas
has cool and rainy winters
has little to no precipitation
has dense shrubs and grasses
Answer:
has very few trees
has cool and rainy winters
has dense shrubs and grasses
Explanation:
I've done this before! Good luck!
According to Reference Table Adv-8, which of the following is the strongest Brönsted-Lowry acid?
1.HS-
2.H2S
3.HNO2
4.HNO3
Answer:
HNO3
Explanation:
The ability of an acid to act as a Brownstead-Lowry acid depends on it's proton donation ability.
A Brownstead-Lowry acid is a specie that donates hydrogen ions in solution.
Considering all the chemical species listed among the options, HNO3 has the greatest hydrogen donation ability. It then follows that HNO3 is the strongest Brownstead-Lowry acid among the species listed.
What is the volume of solution (in mL) produced when 91.80g of Mg(OH)2 are used
to produce a 0.7M solution? Record your answer to 1 decimal places.
Answer: The volume of solution is 2248 ml
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml
moles of [tex]Mg(OH)_2[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{91.80g}{58.32g/mol}=1.574mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]0.7=\frac{1.574\times 1000}{V_s}[/tex]
[tex]V_s=\frac{1.574\times 1000}{0.7}=2248ml[/tex]
Therefore, the volume of solution is 2248 ml
Students are comparing the physical properties of sugar water, salt water,and plain water,including the affects of thermal energy. What safety equipment is needed?
A-Graduated Cylinder and gloves
B-safety goggles and thermometer
C-thermometer and hot plate
D-safety goggles and gloves
Answer:
D
Explanation:
The safety equipment that is needed when your doing a science experiment you need a safety goggles and gloves.
When a substance changes from a liquid to a solid, it has reached its _____ point
Answer:
The temperature at which a substance changes from the liq- uid state to the solid state is called the freezing point. The freez- ing point of the liquid state of a substance is the same temperature as the melting point of the solid state. For example, solid water melts at 0°C and liquid water freezes at 0°C.
Explanation:
PLEASE HELP :)
which type of reaction is shown in the diagram
a. fusion, because the reaction released energy?
b.fission, because the reaction absorbed energy
c.fusion, because the reaction formed lighter nuclei
d.fission,because the reaction formed heavier nuclei
Answer:
b.fission, because the reaction absorbed energy
Explanation:
The reaction is shown in the diagram is fission. because the reaction absorbed energy. Therefore, option B is correct.
What is fission ?The process of nuclear fission involves the splitting of an atom's nucleus into two or more smaller nuclei. Even by the energetic standards of radioactive decay, the fission process releases a very high quantity of energy and frequently results in gamma photons.
By dissolving large, heavy atoms, like uranium, into smaller ones, like iodine, caesium, strontium, xenon, and barium, to name just a few, fission produces energy. However, fusion involves joining light atoms, such as the deuterium and tritium isotopes of hydrogen, to create the heavier helium.
Nuclear fission is used by all nuclear power plants, and uranium atoms are typically used in nuclear power plants. A neutron splits a uranium atom when it collides with it during nuclear fission, releasing a significant quantity of energy.
Thus, option B is correct.
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26.9 g of solid lithium is combined with 20.0 grams of nitrogen gas. .
When the reaction is complete, an actual yield of 32.5 grams of solid product is produced.
Need to know how to do it, please help me soon!
Answer:
The theoretical yield of
Li
3
N
is
20.9 g
.
Explanation:
Balanced Equation
6Li(s)
+
N
2
(
g
)
→
2Li
3
N(s)
In order to determine the theoretical yield, we must first find the limiting reactant (reagent), which will determine the greatest possible amount of product that can be produced.
Molar Masses
Li
:
6.941 g/mol
N
2
:
(
2
×
14.007
g/mol
)
=
28.014 g/mol
Li
3
N
:
(
3
×
6.941
g/mol Li
)
+
(
1
×
14.007
g/mol N
)
=
34.83 g/mol Li
3
N
Limiting Reactant
Divide the mass of each reactant by its molar mass, then multiply times the mole ratio from the balanced equation with the product on top and the reactant on bottom, then multiply times the molar mass of
Li
3
N
.
Lithium
12.5
g Li
×
1
mol Li
6.941
g Li
×
2
mol Li
3
N
6
mol Li
×
34.83
g Li
3
N
1
mol Li
3
N
=
20.9 g Li
3
N
Nitrogen Gas
34.1
g N
2
×
1
mol N
2
28.014
g N
2
×
2
mol Li
3
N
1
mol N
2
×
34.83
g Li
3
N
1
mol Li
3
N
=
84.8 g Li
3
N
Lithium produces less lithium nitride than nitrogen gas. Therefore, the limiting reactant is lithium, and the theoretical yield of lithium nitride is
20.9 g
.
Explanation:
Select the correct answer.
Which action reflects irresponsible lab safety behavior?
A.
not wearing goggles when breaking a rock with a hammer
B.
not shaking hands with your lab partner after a successful experiment
C.
not chatting with others while mixing two reactive chemicals
D.
not sharing findings and recordings with the general public
E.
not using scientific tools while making crucial observations
Answer:
A. not wearing goggles when breaking a rock with a hammer
Explanation:
You could get extremely hurt if you are not wearing goggles while doing lab work.
The action that reflects irresponsible lab safety behavior is not wearing goggles when breaking a rock with a hammer. Thus, the correct option for this question is A.
What are Lab safety behaviors?Lab safety behaviors may be defined as those actions and habits that are persistently taken by individuals in order to maintain discipline and safety on their own. Some of the lab safety behaviors are as follows:
Avoid skin and eye contact with all chemicals by wearing gloves and goggles.Follow an accurate protocol during an experiment. Beware of all safety showers, eye washers, and fire extinguishers. Avoid eating, drinking, and unnecessary talking in the lab.Never smell or inhale laboratory chemicals.Some of the lab safety behaviors also include not shaking hands with your lab partner after a successful experiment, not sharing findings and recordings with the general public, etc. This is because these are some private sources of information.
Therefore, the action that reflects irresponsible lab safety behavior is not wearing goggles when breaking a rock with a hammer. Thus, the correct option for this question is A.
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