PLS HELP NO LINKS PLS
What percentage of stars do Kepler scientists suggest host Earth size planets?
10.2%
2.6%
5.4%
15.9%
so the other guy can have branliest have a wonderful summer guys! :)
Explain why is it a good idea for the eco-house to have both a wind turbine and solar panels?
Answer:
Explanation:
Wind is more of an efficient power source than solar. Compared to solar panels, wind turbines release less CO2 to the atmosphere, consume less energy, and produce more energy.
Which of the following is a secondary pollutant?
A. Water vapor from a factory smokestack
B. Particulate matter, such as soot
Ο Ο Ο Ο
C. Carbon monoxide from car exhaust
D. Acid rain
Answer:
A. Water vapor from a factory smokestack
Pleaseeee help I’m desperate
If u can answer all three of them
I’ll give you brainliest
Answer:
5.80
Explanation:
At 15 mph, how long does it take to travel 15 miles?
Answer:
1 hour
Explanation:
Travelling at 15 miles per hour will get take 1 hour to travel 15 miles.
What do faults mean? I can see if people write it on goo gle btw.anddddddf short answers only please
Answer:
faults are wrong or disallowed options or suggestions.
This gardener started with much smaller plants in this park. Over time, the garden has grown into a large display of brilliant flowers. What would you tell the gardener to explain how the plants have grown and flourished so successfully?
When the pH of an aqueous solution is 8, what is the OH- ion concentration in moles per liter?
A. 1 × 10-14
B. 1 × 10-8
C. 1 × 10-7
D. 1 × 10-6
Answer:
D. 12 is 1 × 10-6
Explanation:
The answer is Option D is correct , the OH- ion concentration in moles per liter is 1 x 10 ⁻⁶ moles /liter .
What is pH ?
It is a measure of how acidic/basic water is.
The range goes from 0 to 14, with 7 being neutral.
pH less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
The pH of water is a very important measurement concerning water quality.
pOH = - log [OH⁻]
pH + pOH = 14
We have been given that pH is 8
so pOH will be 14 - 8 = 6
pOH = - log[OH⁻]
[OH⁻] = antilog [- pOH]
[OH⁻] = antilog [-6]
[OH⁻] = 1 x 10 ⁻⁶ moles /liter
Therefore Option D is correct , the OH⁻ ion concentration in moles per liter is 1 x 10 ⁻⁶ moles /liter .
To know more about The answer is Option D is correct , the OH- ion concentration in moles per liter is 1 x 10 ⁻⁶ moles /liter .
What is pH ?
It is a measure of how acidic/basic water is.
The range goes from 0 to 14, with 7 being neutral.
pH less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
The pH of water is a very important measurement concerning water quality.
pOH = - log [OH⁻]
pH + pOH = 14
We have been given that pH is 8
so pOH will be 14 - 8 = 6
pOH = - log[OH⁻]
[OH⁻] = antilog [- pOH]
[OH⁻] = antilog [-6]
[OH⁻] = 1 x 10 ⁻⁶ moles /liter
Therefore Option D is correct , the OH⁻ ion concentration in moles per liter is 1 x 10 ⁻⁶ moles /liter .
To know more about pH
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44.0L of O2 react with excess Sulfur dioxide gas. All gases are kept at the same temperature, pressure, and volume. What will be the theoretical yield of Sulfur trioxide gas in Liters?
Answer:
The theoretical yield of sulfur trioxide is 88.0 Litres
Explanation:
The chemical reaction occurring between oxygen and sulfur dioxide is given in the chemical equation below :
2SO₂ + O₂ ----> 2SO₃
From the equation of reaction, 2 moles of sulfur dioxide reacts with 1 mole of oxygen to produce 2 moles of sulfur trioxide.
Volume of 1 mole of a gas at STP is 22.4 L
Number of moles of gas in 44.0 L = 44.0/22.4 moles
1 mole of oxygen reacts with 2 moles sulfur dioxide to produce 2 moles of sulfur trioxide;
44/22.4 moles of oxygen will react with excess sulfur dioxide to produce 2 × 44/22.4 moles of sulfur trioxide = 88/22.4 moles of sulfur trioxide
88/22.4 moles of sulfur trioxide will have a volume of 88/22.4 × 22.4 Litres = 88.0 Litres
Therefore, the theoretical yield of sulfur trioxide is 88.0 Litres
Fullerenes (like the one shown) are made up of hexagonal rings of carbon atoms (like in graphite or graphene) and alternating pentagonal and heptagonal carbon rings to allow curvature of the surface producing molecules that have a complete hollow shape.
The extremely small diameter of the nanoparticle fullerenes (which act like a cage) allows them to readily pass through cell membranes and be readily absorbed into the body.
What potential benefit does this have in the pharmaceutical industry as well as medicine?
A)
The very small fullerene molecules would keep cancer cells from invading other healthy cells. As a result, it would keep cancer from spreading.
B)
The very small fullerene molecules could allow surgeons to see the insides of cells with tiny cameras as they perform complex surgery.
C)
The very small fullerene molecules could obstruct hazardous chemicals from getting into absorbed into cells.
D)
The very small fullerene molecules could easily deliver drugs directly into cells in a highly controlled manner.
Answer:
Your answer choice is D
Explanation:
I just got it right on USATestprep :))
What is Dalton’s Law as it applies to partial pressures?
Answer:
According to Dalton's law of partial pressures, the total pressure by a mixture of gases is equal to the sum of the partial pressures of each of the constituent gases. The partial pressure is defined as the pressure each gas would exert if it alone occupied the volume of the mixture at the same temperature.
1. Does warm air rise or sink? Does cold air rise or sink?
2. Air pressure can be high or low. Does air flow from low to high pressure or from high to low pressure?
3. Which is heavier—warm air or cold air?
4. Which has higher air pressure—warm air or cold air? How do you know?
5. Global circulation cells occur because of uneven heat distribution and the earth's rotation. What do we call the effect of the earth's rotation on air circulation?
Answer:
1. Hot air rises and cold air descends for exactly the same reason
Matter are anything that is made up of atoms. The quantity of matter can be seen only on the basis of mass and volume calculation. Therefore, warm air rise and cold air sink.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science.
Matter is anything that is made up of atoms. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter.
Warm air rises while cold air descends. This is because hotter air takes more energy than cooler air. Furthermore, hot and cold temperatures are precisely proportionate to their density. As a result, when it's really hot, the hotter air is more likely to rise than when it's very cold.
Therefore, warm air rise and cold air sink.
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A hydrate of copper (II) chloride, CuCl2∙nH2O, is heated until the mass of the anhydrate remains constant at 19.72 g, indicating a loss of 5.32 g of water. How many moles of water are present for each mole of salt in the original hydrate? (Find n.)
Answer:
n = 2
Explanation:
To solve this question we must find the moles of the anhydrate CuCl2 (Obtained from the mass of 19.72g) and the moles of water (Obtained from the 5.32g):
Moles CuCl2 -Molar mass: 134.45g/mol-
19.72g * (1mol / 134.45g) = 0.14667 moles
Moles H2O -Molar mass 18.01g/mol-
5.32g * (1mol / 18.01g) = 0.2954 moles
The ratio of moles of H2O:CuCl2 is:
0.2954 moles / 0.14667moles = 2.0
That means n = 2 and the formula is:
CuCl2∙2H2O
Based on the electron configuration of the two atoms, predict the ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the compound. sodium and bromine
Answer:
A. 1:1
Explanation:
The ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the sodium and bromine compound is 1:1 because sodium needs to lose one electron and bromine needs one electron to become stable and complete its outermost shell. When sodium lose electron, it become cation and gain +1 charge while on the other hand, the bromine accept one electron and become anion and gain -1 charge so that's why we can say that there is 1:1 of metal cationic (+) atom to nonmetal anionic (-) atom in the sodium and bromine compound.
what happens if water is added to concentrated acid
Answer:
Heat is released when they are both mixed together.
Explanation:
How many different elements are there in 4AgNO3
Answer:
bobo ang brainly
Explanation:
kasi hindi nya binibigay a ng tamang question
Which of these is true for a fission reaction?
A. it is an endothermic reaction
B.a heavy nucleus splits into two smaller nuclei
C.two light nuclei combine to form a single heavier nucleus
D.it is an interaction between valence electrons of a atom.
Answer:
Explanation:
The answer is B heavy nucleus splits into two smaller nuclei
How many particles are in 0.55 mil NaCl?
Answer:
2 atoms
Explanation:
3. At 10.0°C and 2.00 atm, the volume of the gas is 75.0 mL. If the temperature of the gas increases to
35.0°C and the pressure decreases to 1.00 atm, what is the new volume?
a. 1630 mL
b. 138 ml
c. 163 mL
d. 0.0017mL
Explanation:
c.
[tex]from \\ \frac{P _{1} V _{1} }{T _{1}} = \frac{P _{2} V _{2}}{T _{2}} \\ \frac{2 \times 75}{(10+273)} = \frac{V _{2} \times 1}{(35+273)} \\V _{2} = \frac{2 \times 75 \times (35+273)}{(10+273) \times 1} \\ V _{2} = 163 \: ml[/tex]
10 points. Any help is appreciated.
Answer:
I dont see the image
Explanation:
pls make it close up
Name this compound according to IUPAC nomenclature rules.
A) nitrogen oxide
B) nitrogen oxygen
C) nitrogen monoxide
D) Mononitrogen monoxide
Answer:
B: nitrogen oxygen
Explanation:
Hope it helps you thanks!!
Is this equation right?
Answer:
no
Explanation:
because the characters are invalid
Answer:
no
Explanation:
because they are not valid
PLZ ANSWER
Unit Activity: Kinetic Molecular Theory and Gas Laws
Part A
What is the composition and percentage of the gases in Earth’s atmosphere?
Part B
List in ascending order the different layers of atmosphere, their heights, and main features.
Part C
Why are the gases in the troposphere layer denser than the gases in the other layers? Give reasons for your answer.
Part D
How does the kinetic theory of gases explain the weather changes happening in the troposphere? You can also research on the Internet using keywords such as troposphere, atmospheric layers, and weather changes.
Answer:
part a
Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent
part B
The atmospheric layers are as follows.
Troposphere : The Troposphere is the atmospheric layer closest to the Earth. ...
Stratosphere : The Stratosphere is just above the troposphere, starting at an average altitude of about 7 miles above the sea level. ...
Mesosphere : ...
Thermosphere : ...
Ionosphere : ...
Exosphere :
part c
The troposphere is denser than all its overlying atmospheric layers because a larger atmospheric weight sits on top of the troposphere and causes it to be most severely compressed. ... Nearly all atmospheric water vapor or moisture is found in the troposphere, so it is the layer where most of Earth's weather takes place
part D
It also states that the average kinetic energy of gas molecules is proportional to its temperature. Scientists know that the uneven heating of the Earth is what causes wind and weather in the troposphere
these are the correct answers
please mark brainliest
Answer:
part a
Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent
part B
The atmospheric layers are as follows.
Troposphere : The Troposphere is the atmospheric layer closest to the Earth. ...
Stratosphere : The Stratosphere is just above the troposphere, starting at an average altitude of about 7 miles above the sea level. ...
Mesosphere : ...
Thermosphere : ...
Ionosphere : ...
Exosphere :
part c
The troposphere is denser than all its overlying atmospheric layers because a larger atmospheric weight sits on top of the troposphere and causes it to be most severely compressed. ... Nearly all atmospheric water vapor or moisture is found in the troposphere, so it is the layer where most of Earth's weather takes place
part D
It also states that the average kinetic energy of gas molecules is proportional to its temperature. Scientists know that the uneven heating of the Earth is what causes wind and weather in the troposphere
Explanation:
plato
FIRST GETS BRAINLIEST (THE ONE THAT IS CORRECT)
A generator changes (Mechanical, Electrical, Static) energy into
(Mechanical, Electrical, Magnetic) energy.
Answer:
mechanical energy to electrical energy
Explanation:
The water turns the turbine with produces mechanical energy so the generator converts it to electrical energy
Dissolved hydrofluoric acid reacts with dissolved sodium hydroxide to form water and aqueous sodium fluoride
Answer:
HF(aq)+NaOH(aq)→NaF(aq)+H2O(l)
Explanation:
Complete question
Dissolved hydrofluoric acid reacts with dissolved sodium hydroxide to form water and aqueous sodium fluoride. What is the net ionic equation
Equilibrium equation between the undissociated acid and the dissociated ions
HF(aq)⇌H+(aq)+F−(aq)
Sodium hydroxide will dissociate aqueous solution to produce sodium cations, Na+, and hydroxide anions, OH−
NaOH(aq)→Na+(aq)+OH−(aq)
Hydroxide anions and the hydrogen cations will neutralize each other to produce water.
H+(aq)+OH−(aq)→H2O(l)
On combining both the equation, we get –
HF(aq)+Na+(aq)+OH−(aq)→Na+(aq)+F−(aq)+H2O(l)
The Final equation is
HF(aq)+NaOH(aq)→NaF(aq)+H2O(l)
Which of the following is the same as 1 second?
O A. 1,000 ks
B. 0.1 ms
C. 100 cs
D. 100 ms
(1) We are sorry to say that we will not be able to publish your short story "Max versus the Robots in the school literary magazine. (2) Our editorial board enjoyed the story's creative setting and interesting characters. (3) However, the board ultimately decided that the plot was too confusing, and several members found the ending to be implausible. (4) In addition, some readers were concerned that the technical details about robots were totally boring. (5) Although we have to reject this story, we hope to publish your work in the future, so please submit a story to us again. Which option best revises this paragraph to maintain a formal tone throughout? (T) A. Replace sentence 4 with: In addition, some readers were concerned that the technical details about robots would not be of interest to most students. B. Replace sentence 2 with: The creative setting was enjoyed by the board, and the interesting characters were appreciated bynbe board as well! c. Replace sentence 5 with: While it is with great regret that we must rebuff your literary endeavor, we would like to disseminate a future opus penned by you If you would be so kind as to dispatch an additional work to us for our consideration. 0 D. Replace sentence 3 with: But the editorial board ultimately decided that the plot was too confusing, and several members had no clue what the deal was with the ending,
B.
Replace sentence 4 with: In addition, some readers were concerned that the technical details about robots would not be of interest to most students.
Explanation:
i just did the test
Answer:
It's B.
Explanation:
Night visin cameras are sensitive to energies around 2.21 x 10-19 J. What wavelength of electromagnetic radiation do they use?
Answer:
8.99×10^-7m
Explanation:
The wavelength can be calculated using the expression below
E=hcλ
Where E= energy= 2.21 x 10^-19 J.
C= speed of light= 3x10^8 m/s
h= planks constant= 6.626 × 10^-34 m2 kg / s
E=hcλ
λ= E/(hc)
Substitute for the values
λ=( 2.21 x 10^-19 )/(6.626 × 10^-34 × 3x10^8 )
= 8.99×10^-7m
Answer:
Look at the explanation this one is hard
Explanation:
show your work:
E = hc/ λ
E λ = hc
λ = hc/E
λ = 6.626 x 10^-34 x 3 x 10^8 / 2.21 x 10^-19
=
8.994 x 10-7 m or 899.4 nm
800nm – 3mm is the range of wavelengths for infrared waves.
Night vision cameras use infrared waves.
What do polar bonds share with electrons?
Answer:
Polar Covalent Bonds. A polar covalent bond exists when atoms with different electronegativities share electrons in a covalent bond. Consider the hydrogen chloride (HCl) molecule. Each atom in HCl requires one more electron to form an inert gas electron configuration.
Explanation:
Because fresh water is constantly be evaporated from the ocean and then replaced by rivers, the salinity of the oceans ____.
A.increases
B.doubles
C.remains balanced
D. decreases
Answer: Because fresh water is constantly be evaporated from the ocean and then replaced by rivers, the salinity of the oceans remains balanced.
Explanation:
When evaporation takes place in sea water then of course there will occur an increase in salinity.
But as this evaporated water is replaced by water coming from rivers. As a result, the raising salinity is counter balanced by the water coming from rivers.
Hence, salinity remains balanced in sea water.
Thus, we can conclude that because fresh water is constantly be evaporated from the ocean and then replaced by rivers, the salinity of the oceans remains balanced.