Answer:
When light waves strike a medium and are neither reflected or refracted, nor are they allowed to pass through.
Explanation:
Europe and United States use geothermal power extensively.
True
False
Answer:
True
Explanation:
US. With an installed capacity of 3,639MW in 2018, the US is the leading producer of geothermal energy across the world, producing 16.7 billion kilowatt hours (kWh) of geothermal energy throughout the year. More recently, extensive direct heat utilization projects have been undertaken in many European countries, and electric power developed extensively in Italy and Iceland. Geothermal heat pumps became extensively used in Austria, Switzerland, Germany and Sweden (Antice, Miklos and Sanner, Burkhard, 2007).
Calculate the pH is the
concentration of [H+] = 1.00x 10^-11
Answer:
1e - 11
Explanation:
Monkeys eat insects and plants. What ecological role best describes monkeys
Answer:
scavenger or consumer
Explanation:
they collect and gather fruits, and different wild life
How are ball and sticks and space filling are similar ?
Answer:
Ball and stick models are three-dimensional models where atoms are represented by spheres of different colors and bonds are represented by sticks between the spheres. ... Space fill models are similar to ball and stick models in that they are three-dimensional models that represent atoms as colored spheres.
4.550 g of Na2SO4 are added to 0.350 L of water. To this solution, 0.085 L of water were added. What is the new concentration of the solution?
Answer:
0.0736 M or 10.4 g/L
Explanation:
First we convert 4.550 g of Na₂SO₄ into moles, using the molar mass of Na₂SO₄:
4.550 g ÷ 142.04 g/mol = 0.0320 molThen we calculate the final volume of the solution:
Final Volume = 0.350 L + 0.085 LFinal Volume = 0.435 LNow we can proceed to calculate the concentration -in molarity- of the solution:
Molarity = moles / liters0.0320 mol / 0.435 L = 0.0736 MIn g/L the concentration would be:
4.550 g / 0.435 L = 10.4 g/LWhich situation has given to a trait that could be passed on to offspring ?
Answer:
Heredity, also called inheritance or biological inheritance, is the passing on of traits from parents to their offspring; either through asexual reproduction or sexual reproduction, the offspring cells or organisms acquire the genetic information of their parents.
Explanation:
Plss markk me Brainlyist
Name the following base: NaOH
Answer:
Arrhenius Base
Explanation:
"NaOH is an Arrhenius base because it dissociates in water to give the hydroxide (OH-) and sodium (Na+) ions. An Arrhenius acid is therefore any substance that ionizes when it dissolves in water to give the H+, or hydrogen, ion. ... Acids provide the H+ ion; bases provide the OH- ion; and these ions combine to form water."
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A ship is sailing at a speed of 5 km/hr. What distance has it covered, 2 hours after it left the port?
Answer:
10km
Explanation:
Answer:
[tex]\boxed {\boxed {\sf 10 \ kilometers}}[/tex]
Explanation:
Distance is the product of speed and time.
[tex]d=s \times t[/tex]
The speed of the ship is 5 kilometers per hour. The time is 2 hours.
s= 5 km/hr t= 2 hrSubstitute the values into the formula.
[tex]d= 5 \ km/hr * 2 \ hr[/tex]
Multiply. Note that the hours will cancel each other out.
[tex]d= 5 \ km * 2 \\d=10 \ km[/tex]
The ship covers a distance of 10 kilometers.
!!!PLEASE HELP!!!!
What is the molarity of a solution with 0.5 moles of potassium fluoride dissolved to make 50 mL of solution?
A.0.1 mol/L
B.10 mol/L
C.1.72 mol/L
D.1450 mol/L
Answer: B
Explanation: molarity = concentration c= n/V = 0.5 mol/ 0.05 l = 10 mol/l
The molarity of a solution is the number of moles of its solute divided by volume in liters. The molarity of the 50 ml solution containing 0.5 moles of potassium fluoride is 10 M or 10 molar.
What is molarity ?Molarity is a common term used to express the concentration of a solution. It is the ratio of number of moles of solute particles to the volume of solution in liters. Hence, its unit is mol/L or molar.
The molarity of a solution is a colligative quantity as well as temperature dependent.
Given,
no.of moles of potassium fluoride salt in water = 0.5 moles.
volume of solution = 50 ml
1 L = 1000 ml
then 50 ml = 0.05 L.
Molarity = no.of moles of solute/ volume of solution in L
M = 0.5 moles/ 0.05 L
= 10 M.
Therefore, the molarity of the given solution is 10 molar.
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the pressure of a 250.0 mL volume of gas under 4.0 atm of pressure is decreased to 1.0 atm at constant tempture what is a new volume
Answer:
1000 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we're finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{250 \times 4}{1} = 1000 \\ [/tex]
We have the final answer as
1000 mLHope this helps you
Which statement is correct?
Natural processes happen spontaneously when they decrease the entropy of a system because entropy increase is counteracted by the flow of enthalpy from high temperatures to low temperatures.
Among solids, liquids, and gases, solids generally have the highest entropy because solid particles are the least mobile, and entropy is inversely related to mobility of particles.
Any change that increases the number of particles in a system increases entropy because it increases the randomness and disorder of the system.
Dissolving table salt (NaCl) in water leads to a decrease in entropy because salt particles, which are numerous individual crystals in solid form, become a homogenous solution in water.
Answer:
Any change that increases the number of particles in a system increases entropy because it increases the randomness and disorder of the system.
Explanation:
Imagine dropping a glass pitcher on a hard surface. The pitcher breaks into numerous shards. If the shards were collected and dropped again, they would tend to break into smaller shards; they would not reassemble themselves into a pitcher. In the universe, there is a tendency for order to be replaced with disorder. This tendency is related to a concept called entropy. The formal definition of entropy is a measure of the degree of randomness and disorder in a system.
A catalyst is:
one answer only pls help lol
Answer:
the second one
Explanation:
it makes the most sense
Is the kool-aid man the jar or the liquid?
I know that this is for school but like i need to know
Answer:
I think both
Explanation:
Water vapor is not usually seen.
Answer:
True
Explanation:
Water vapor is totally invisible.
Without it, there would be no clouds or rain or snow, since all of these require water vapor in order to form. All of the water vapor that evaporates from the surface of the Earth eventually returns as precipitation - rain or snow.
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The planet Mercury takes 176 days to do one spin around its pole. Compared to the Earth,
would the Sun appear to move more quickly across Mercury's sky or more slowly? Why?
Thank you who ever help me
Answer:
The sun would appear to move more slowly across Mercury's sky.
Explanation:
This is because, the time it takes to do one spin or revolution on Mercury is 176 days (which is its period), whereas, the time it takes to do one spin or revolution on the Earth is 1 day.
Since the angular speed ω = 2π/T where T = period
So on Mercury, T' = 176days = 176 days × 24 hr/day × 60 min/hr × 60 s/min = 15,206,400 s
So, ω' = 2π/T'
= 2π/15,206,400 s
= 4.132 × 10⁻⁷ rad/s
So on Earth, T" = 1 day = 1 day × 24 hr/day × 60 min/hr × 60 s/min = 86,400 s
So, ω" = 2π/T"
= 2π/86,400 s
= 7.272 × 10⁻⁵ rad/s
Since ω' = 4.132 × 10⁻⁷ rad/s << ω" = 7.272 × 10⁻⁵ rad/s, the sun would appear to move more slowly across Mercury's sky.
What is the freezing point, in °C, of a solution made with 1.31 mol of CHCl₃ in 530.0 g of CCl₄?
Answer:
-96.6°C
Explanation:
Given:
moles CHCl3 = 1.31 molmass CCl4 = 530.0 gmass CCl4 = 530.0 g * (1 kg / 1000)
mass CCl4 = 0.5300 kg
First calculate the molality (m) of the solute, which is the moles of solute divided by the kg of solvent ([tex]\frac{moles}{kg}[/tex]):
molality CHCl3 = (mass moles CHCl3) / (mass CCl4 in kg)
molality CHCl3 = (1.31 mol) / (0.5300 kg)
molality CHCl3 = 2.471698m
Decrease in freezing point of solvent = (Kf) * (molality of solute)
Decrease in freezing point of CCl4 = (Kf) * (molality CHCl3)
Decrease in freezing point of CCl4 = (29.8°C/m) * (2.47m)
Decrease in freezing point of CCl4 = 73.6566°C
Then use the molality of the solute to calculate the change in freezing point and subtract the change from the original freezing point.
Freezing point of solution =
(freezing point of pure solvent) - (Decrease in freezing point)
Freezing point of solution = (-22.9°C) - (73.66°C)
Freezing point of solution = -96.6°C
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How do you recognize substances that have gone through physical or chemical changes?
PLEASE HELP!!!!
Which bond would be the least polar?
1) H-Br (hydrogen-bromine)
2) H-F (hydrogen-fluorine)
3) H-H (hydrogen-hydrogen)
4) H-O (hydrogen-oxygen)
Answer:
[tex]\boxed {\boxed {\sf 3. \ H-H}}[/tex]
Explanation:
To determine the polarity of a bond, we use the electronegativities of the individual atoms. The greater the difference, the more polar the bond.
1. H-Br
Hydrogen: 2.2 Bromine: 3.03.0-2.2=0.8
2. H-F
Hydrogen: 2.2 Fluorine: 4.04.0-2.2=1.8
3. H-H
Hydrogen: 2.22.2-2.2=0.0
4. H-O
Hydrogen: 2.2Oxygen: 3.43.4-2.2=1.2
As we can see, the lowest difference is in hydrogen hydrogen at 0.0. You may also recognize that because they are 2 atoms of the same element, the electronegativity is the same for both, so it will equal 0. Since the electronegativity is 0, this is a nonpolar bond.
How many atoms does NH4Br have
Answer:
6
Explanation:
bromine has 1, hydrogen has 4 and nitrogen has 1 therefore equaling 6
The number of atoms in NH₄Br is six.
What is an atom?An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.
Atoms are the basic building blocks of matter. Anything that takes up space and anything with mass is made up of atoms.
In the given formula, there is one N atom, four H atoms and one Br atom making a total of six atoms.
Therefore, the number of atoms in NH₄Br is six.
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Write two paragraphs about what would happen if your whole body was put in a low pressure environment ?
Answer:
Reduced air pressure also has a serious effect on the human body. Reduced air pressure means that there is less oxygen available to the body. For lungs to inflate, the air pressure in your lungs has to be less than the air outside the lungs. This is because air moves from high-pressure areas to low-pressure areas.
Explanation:
Reduced air pressure also has a serious effect on the human body. Reduced air pressure means that there is less oxygen available to the body. For lungs to inflate, the air pressure in your lungs has to be less than the air outside the lungs. This is because air moves from high-pressure areas to low-pressure areas.
24
Select the correct answer.
Which statement is correct?
A.
When the concentration of the reactant decreases, the cell potential increases.
B.
When the concentration of the reactant decreases, the cell potential does not change.
C.
When the concentration of the reactant increases, the cell potential decreases.
D.
When the concentration of the reactant increases, the cell potential increases.
E.
When the concentration of the reactant increases, the cell potential does not change.
Answer:
the answer is b
Explanation:
what type of wave moves the particles parallel to the motion of the wave
a.electromagnetic
b. longitudinal
c. transverse
d.water
Answer is in a ph[tex]^{}[/tex]oto. I can't attach it he[tex]^{}[/tex]re, but I uploaded it to a fi[tex]^{}[/tex]le hosting. link below! Good Luck!
bit.[tex]^{}[/tex]ly/3a8Nt8n
How many grams of sodium carbonate (Na2CO3) are needed to produce 6.78
moles of sodium chloride (NaCl). the molar mass of sodium carbonate is 105
99 g/mol.
Answer:
359.3g of Na₂CO₃ are required
Explanation:
When sodium carbonate, Na₂CO₃ reacts with HCl, NaCl and H₂O are produced as follows:
Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O
Where 1 mole of sodium carbonate produce 2 moles of NaCl
To solve this question, we must find the moles of sodium carbonate required to produce the 6.78 moles of NaCl. With this mass and the molar mass we can find the mass of sodium carbonate as follows:
Moles Na₂CO₃:
6.78 moles NaCl * (1mol Na₂CO₃ / 2mol NaCl) = 3.39 moles Na₂CO₃
Mass Na₂CO₃ -Molar mass: 105.99g/mol:
3.39 moles Na₂CO₃ * (105.99g / mol) =
359.3g of Na₂CO₃ are requiredAnswer and explain why you chose it
Answer:
Umm I think it 2
Explanation:
A mass of 0.30 kg is attached to a spring that has a spring constant of 210 N/m. What will be the period of this system?
Answer:
its A hope this helps
Explanation:
if the original volume of a gas was 300 ml at 0.250 atm and 400.0 k what is the volume of the gas at 2.00 atm
Answer:
the answer is 18.75
How do plants and animals rely on each other?
Answer:
b
Explanation:
How long does it take the Earth to move from Point A to Point C?
Answer:
the answer should be six months
Explain what helps convert non-rich oxygen blood cells back to oxygen rich cells?
Answer:
As blood travels through the body, oxygen is used up, and the blood becomes oxygen poor. Oxygen-poor blood returns from the body to the heart through the superior vena cava (SVC) and inferior vena cava (IVC), the two main veins that bring blood back to the heart.
Explanation:
???????????????????????
Answer:
B and D
Explanation:
Bc it has more fat than the other
