Answer:
two electrons is the answer.
How many atoms are present in 3.500 mol of NH3? NEED ANSWER ASAP
if you are curious at to why so many of ur family members have certain hair or eye color, you might want to look at... A. Astrology... B. A family tree... C. Heredity... D.Geometry
Answer:
c) hereditary
Explanation:
This means that if your parents had one eye colour, you'll most likely have the same one because you share the same genes, and it's passed down to you.
A forest has both light colored trees and dark colored trees this same forest had both light colored months and dark colored months one year there is a disease that moves through the forest killing many of the light colored trees when the light colored trees were killed by a disease the forest became almost entirely composed of dark - colored trees generations later almost all months in the forest were dark in color instead of light which of the following gives the most likely explanation for why almost all the months were dark in color.
The dark moths were better hidden from predators and therefore more of them survived and this allowed them to have offspring.
Answer:
The dark moths were better hidden from predators and therefore more of them survived and this allowed them to have offspring.
Explanation:
If all of the light colored trees disappeared and there are only dark colored ones, then that means that the light colored moths wouldn't be able to live long since their traits wouldn't match the environment. This then leads to the conclusion that dark moths would be better hidden since their trait fits their current environment and would let them be hid much better from predators. This would allow them to survive longer and eventually, reproduce.
NO FAKE ANSWERS WILL GIVE BRAINLIEST
One mole of copper has a mass of 63.5 grams. Approximately how many atoms of copper are present in one mole of copper?
63 atoms
64 atoms
32 × 1023 atoms
6 × 1023 atoms
Answer:
6 × 10^23 atoms
Explanation:
This is because Avogadro's number aka 6.02 x 10^23 is applicable to every element and is the number of atoms in any 1 mole of an element. The answer 6 x 10^23 is closest to 6.02 x 10^23 because the 6.02 was rounded to just 6. Hope this helps :)
Answer:
The answer is D)
Explanation:
6 X 10^23
A gas occupies 10.2 liters at 0.60 atm. What is the pressure if the volume becomes 3.0 L?
Calculate the pH of each of the following solutions. (a) 0.12 M KNO2 WebAssign will check your answer for the correct number of significant figures. (b) 0.37 M NaOCl WebAssign will check your answer for the correct number of significant figures. (c) 0.39 M NH4ClO4 WebAssign will check your answer for the correct number of significant figures.
Answer:
a. pH → 8.12
b. pH → 10.55
c. pH → 8.38
Explanation:
In this excersise, the first two salts come from a strong base and a weak acid, so the anion will make hydrolisis that can help us, to determine pH.
The NH₄ClO₄ comes from a weak acid and a weak base. This is an special case.
a. KNO₂ → K⁻ + NO₂⁻
NO₂⁻ + H₂O ⇄ HNO₃ + OH⁻ Kb = 1.41×10⁻¹¹
Kb = x² / (0.12 - x)
We can avoid the x in denominator because Kb it is a very low value. This expression is reduced to:
[OH⁻] = √(Kb . 0.12)
[OH⁻] = √(1.41×10⁻¹¹ . 0.12) = 1.30×10⁻⁶ M
- log [OH⁻] = pOH → - log 1.30×10⁻⁶ = 5.88
14 - pOH = pH → 14 - 5.88 = 8.12
b. NaOCl → Na⁻ + OCl⁻
OCl⁻ + H₂O ⇄ HClO + OH⁻ Kb = 3.33×10⁻⁷
The same as before, we avoid the x in denominator because Kb it is a very low value.
[OH⁻] = √(Kb . 0.37)
[OH⁻] = √(3.33×10⁻⁷ . 0.37)
[OH⁻] = 3.51×10⁻⁴ M
- log 3.51×10⁻⁴ = 3.45 → pOH
14 - 3.45 = 10.55 → pH
c. NH₄ClO₄ → NH₄⁺ + ClO⁴⁻
Both ions can make hydrolisis in water. Ammonium can give ammonia and the hypochlorite makes hypochlorous acid.
NH₄⁺ + H₂O ⇄ NH₃ + H₃O⁺ Ka = 5.7×10⁻¹⁰
OCl⁻ + H₂O ⇄ HClO + OH⁻ Kb = 3.33×10⁻⁷
The reduced expression to calculate pH for this sort of salts, is to make the square root of the product between the Ka constant.
As we have Kb for the HClO, we need to determine the Ka
Kw = Ka . Kb → Kw/Kb = Ka → 1×10⁻¹⁴ / 3.33×10⁻⁷ = 3×10⁻⁸
[H₃O⁺] = √(5.7×10⁻¹⁰ . 3×10⁻⁸) = 4.14×10⁻⁹ M
- log [H₃O⁺] = pH → - log 4.14×10⁻⁹ = 8.38
As per the calculations of the pH the solutions of 0.12 M KNO2 and 0.37 M NaOCl and the 0.39 M NH4ClO4 web assign have been made with a significant check on the figures.
Thus the answer for the first is pH → 8.12 and that of second calculation is pH → 10.55 and the last id pH → 8.38.Learn more about the Calculate the pH of each of the following solutions.
brainly.com/question/9465562.
0.074 liters of a 15 M solution need to be diluted so that the new
concentration is 3.40 molar. What should the new volume of the solution
be?
A) 0.17 liters
B) 0.33 liters
C) 2.3 liters
D) 3.2 liters
Answer:
3.2
Explanation:
i caculated give me a 1 star if incorrect
does all Newton's laws work together
4
Isotopes are atoms of the same element with the same number of
protons and
(0.5 Points)
O a different number of neutrons.
a different number of electrons
a different number of molecules
the same number of neutrons
Answer:
a. is tae answer
Explanation:
tamapoyang sagot ko)
What is the mass of 3.25 moles of sodium hydroxide (NaOH)?
Answer:
1 mole is equal to 1 moles NaOH, or 39.99711 grams.
Explanation:
Hope this helps have a nice day :)
The statement of the mass of sodium hydroxide (NaOH) is "130 g."
What is mass?A substance is something to do with mass that takes up space. The mass of a compound is the total amount of atoms present in grams that make up a molecule. The grams is the unit of mass.
In order to determine the mass in grams, multiply moles of the substance value by its molar mass to convert moles into grams.
Mole to gram conversion factor,
[tex]=\;given \;mole\;.\;\frac{grams}{1\;mol}[/tex]
Mass of NaOH comes out to be,
[tex]=\;3.25\;mol\;.\;\frac{39.997\;g}{1\;mol}[/tex]
= 129.99 g
= 130 g
Hence the correct answer is 130 g.
Learn more about mass here
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what type of reaction is Ca + I2 = CaI2
Answer:imnotsurew
Explanation:
A synthesis reaction takes place when carbon monoxide (CO) and hydrogen gas (H2) react to form methanol (CH3OH). How many grams of methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas?
3.2 grams
3.6 grams
4.0 grams
6.0 grams
Answer: 3.2 grams
Explanation:
took the quiz
The methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas is 3.6 grams. option B is correct.
What is methanol?Methanol is also known as methyl alcohol or wood spirit, it is the long series of organic compounds called alcohols, having a methyl group (CH 3) attached with a hydroxy group (OH). Methanol was formerly made by the process of destructive distillation of wood.
Here, 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas as there are 4 hydrogen molecules add 2.8 + 0.50 × 2 = 3.6 grams.
Therefore, methanol are produced when 2.8 grams of carbon monoxide reacts with 0.50 grams of hydrogen gas is 3.6 grams. option B is correct.
Learn more about methanol, here:
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Which radioisotope requires long-term storage as the method of disposal, to protect living things from radiation exposure over time?
Pu-239
FR-229
Fe-53
P-32
Answer:pu-239
Explanation:
Pu-239 is regarded as the radioisotope requires long-term storage as the method of disposal, to protect living things from radiation exposure over time
Disposal of radioactive nuclear waste is often regarded as a problem.
The waste sources are:
Nuclear power reactors Bomb-related nuclear materialDisposal of bomb-grade plutonium is often difficult.
The longer lived isotopes are:
Plutonium-239 whose t1/2 is 24,110 years, Plutonium-240 whose t1/2 is 6,540 years, Curium-245 whose t1/2 is 8,500 years. etc.The storage of the longer lived elements is through containment for the next several thousand of years.
The control or management of radioactive waste is a hard, multifaceted procedure.
Learn more from
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where are chemicals found?
A.) only in liquids
B.) only in air
C.) in solids,liquids, and gases
D.) only in powders
Answer: c
Explanation: pretty sure its c :]
How are a rainforest and a desert different? A desert can be found in more than one climate zone. A desert experiences hot summers and cold winters. A rainforest has a high level of humidity. A rainforest has high average temperatures.
Answer:
A rainforest has a high level of humidity.
Explanation:
A characteristic of the desert biome is aridity, or very dry air. This is the opposite of humidity.
An experiment shows that a 118 mL gas sample has a mass of 0.161 g at a pressure of 730 mmHg and a temperature of 32 ∘C.
What is the molar mass of the gas?
Answer:
35.54g/mole
Explanation:
using the formula PV=nRT will allow you to solve for n which is the number of moles. R is a constant and you should use 62.3637 L mmhg/mol K.
In order to make sure your units match you have to convert the 118ml of gas to .118L and temperature needs to be converted to Kelvin. 32C + 273=305K
now you can use the formula to solve for n = number of moles once you get that number you will need to divide that by .161g. Molar mass is g/moles
PLEASE HELP ASP!! ILL MARK U AS BRAINLIEST Two objects have a certain gravitational force between them. What would happen if the mass of one of the objects suddenly increased?
The mass of the other object would increase.
The distance between the objects would increase.
The gravitational force of the objects would remain constant.
The gravitational force between the two objects would increase.
Answer:
The gravitational force between the two objects would increase.
Answer:
The gravitational force between the two objects would increase.
Explanation:
Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.
Which property is better explained by the band theory than by the sea-of-electrons model?
What makes scientists think that arctic areas were once warm?
they found wooly mammoths there
O they found fossils of horses there
they found fossils of coral there
O the different layers of snow and ice
Answer:well the ice preserves the wooly mammoths
Explanation:its not just snow its bacteria witch means that once living to frozen thats how they know how it looks like and to see what animal its related to now day it related to the elephants
An unknown solid has a specific heat capacity of 0.727 J/gC. If a 12.3 grams sample is heated and increases in temperature from 22.4C to 62.1C, calculate how much heat was absorbed? You must show your work.
I'm a little lost
Answer:
355Joules
Explanation:
The amount of heat absorbed can be calculated using the formula:
Q = m × c × ∆T
Where;
Q = amount of heat absorbed in joules
m = mass of substance in grams
c = specific heat capacity of solid (0.727 J/g°C)
∆T = final temperature - initial temperature (°C)
According to the information provided in this question;
Q = ?
m = 12.3g
∆T = 62.1°C - 22.4°C = 39.7°C
c = 0.727 J/g°C
Using Q = m × c × ∆T
Q = 12.3 × 0.727 × 39.7
Q = 355.001
Q = 355Joules
Hence, 355J of heat was absorbed
The number of grams of sulfur in 223 grams of sodium sulfate is . . . Grams And explain how, I still dont get it fully
Answer:
50.25 g of sulphur, S.
Explanation:
Mass of Na₂SO₄ = 223 g
Mass of sulphur =?
Next we shall determine the molar mass of Na₂SO₄. This can be obtained as follow:
Molar mass of Na₂SO₄ = (23×2) + 32 + (16×4)
= 46 + 32 +64
= 142 g/mol
Mass of S in 142 g of Na₂SO₄ = 32 g
Finally, we shall determine the mass of S in 223 g of Na₂SO₄. This can be obtained as follow:
142 g of Na₂SO₄ contains 32 g of S.
Therefore, 223 g of Na₂SO₄ will contain = (223 × 32) / 142 = 50.25 g of S.
Thus, 223 g of sodium sulfate, Na₂SO₄ contains 50.25 g of sulphur, S.
how many moles are in 3.01 x 10^22
Answer:
The answer is "5 moles".
Explanation:
Please find the complete question in the attached file.
[tex]\to 3.01 \times (10^{22}) = 0.0499822251 \approx 0.05 \ moles[/tex]
Which daily task involves a mix of simple and complex technology?
Which of the following is not a unit of volume?
А. L
B. mL
C.m3
D. cm2
the structure of cyclopentane-1,2-diol
Answer: five carbon atoms forms a ring. In adjacent two carbon atoms
An hydroxyl group (-OH) is attached. Molecular formula is
C5H8(OH)2
Explanation:
Can potassium rust please answer guys
Answer:
Yes
Explanation:
More reactive element since not available in free statte
Answer:
skin contact with potassium metal results in caustic potash corrosion
A leader from Louisiana is claiming that it is necessary to include the effects of tornadoes in his city’s emergency plan for natural disasters. Use data from Map 1, the graphs, and what you know about tornadoes to support his claim.
please answer this now i will give brainliest to first person who got it correct.
and don't answer it if you just gonna write stuff that weren't don't even make since to get the point.
Answer:
i dont know either im sorry
Explanation:
Answer:
Where are the graphs?
Explanation:
Solar radiation provides more heat and cleaner than near the pools on Earth the greatest amount of heat is moved away from the equator by
Answer:
Ocean Currents
Explanation:
The correct answer is Ocean currents.
When the earth receives solar radiation, a large fraction of this incident radiation is usually absorbed by the oceans and the seas, which become warm. Usually, equitorial regions are the ones that have this phenomenon. Now, when ocean currents are flowing from the equator, they usually carry this warm water with them thereby moving the greatest amount of heat from the equator on its way out.
For example, In the Pacific Ocean, there is a current known as Alaska Current that carries warm water in the northward direction thereby making Anchorage which is Alaska's largest city to have a much mild weather than the inland areas with the same latitude.
PLEASE HELP ASAP
What chemical combines with nitrogen dioxide to form nitric acid?
Opg
H
OH
02
03
Answer:
opg
Explanation:
A series of chemical reactions transform Volatile Organic Compounds (VOCs) into substances that combine with nitrogen dioxide to produce PAN (Peroxyacytyl nitrate), yet another element in smog. Nitrogen dioxide in the air also reacts with water vapor to form nitric acid, one of the types of acid in acid rain.
container has a volume of 28 L and a temperature of 45 ºC The volume is increased to 34 L. What is the new temperature of the gas
Answer:
386.14 K ( 113.14 ºC)
Explanation:
Initial Volume V1 = 28 L
Initial Temperature T1 = 45 + 273 = 318 K
Final Temperature T2 = ?
Final Volume V2 = 34 L
The relationship between these quantities is given by the charles law equation;
V1 / T1 = V2/ T2
T2 = V2 * T1 / V1
Inserting the values
T2 = 34 * 318 / 28
T2 = 386.14 K