Hello people ~
Friction always
(a) opposes the motion
(b) helps the motion
(c) both (a) and (b)
(d) none of these​

Answer:

D

Explanation:

12g of carbon produces....... 1 mole of methane

72g of carbon will produce..1÷12 × 72 = 6moles

Use the formula stated below

[tex]\boxed{\sf Molarity=\dfrac{Moles\:of\:solute}{Volume\:in\:L}}[/tex]

So

#H_3PO_4

[tex]\\ \tt\Rrightarrow n=0.015(12)=0.18moles[/tex]

#Ba(OH)_2

[tex]\\ \tt\Rrightarrow n=0.1(3.5)=0.35mol[/tex]

Hence H_3PO_4 is the limiting reagent

Answer:

hope it's helpful to you

Answer:

I recently answered this question. The response I submitted is included below. I beleive my answer should be correct.

Explanation:

Question 1:

C: 48.38g(1mol/12g) = 4.0317 

H: 8.12g(1mol/1.01g) = 8.12

O: 53.5g(1mol/16g) = 3.34375

Divide by the smallest amount (3.34375)

C = 4.0317/3.34375 = 1.206 = 1

H = 8.12/3.34375 = 2.42 = 2

O = 3.34375/3.34375 = 1

Empirical formula = CH2O

Question 2:

Molecular formula = n(empirical formula)

n = molar mass (compound)/molar mass (empirical)

Empirical formula: CH2O

Molar mass of CH2O = 12 + 2x1 + 16 = 30 g/mol

Molar mass of compound: 180.15 g/mol

[tex]n = \frac{180.15g/mol}{30g/mol} = 6[/tex]

Molecular formula = C6H12O6

my teacher hasnt graded yet, but i got the same answer as the guy above. i did my best to explain the process for y'all if you genuinely don't understand/know how to do it. THE PROCESS IS VERY LONG, but youll get it eventually if i didnt help lol GOODLUCK

and yes, the molecular formula is C6H12O6

Explanation:

Answer:

here:)

Explanation:

Natural Sciences is the core of the branches of science as studies the nature of our physical world and the universe. The three branches of Natural Sciences are:

Physics, the Study of Universe.

Chemistry, the Study of Matter.

Biology, the Study of Life and Living Organisms.

Answer:

evaporation

Explanation:

Evaporation occurs when a liquid changes to a gas. During evaporation, molecules gain enough thermal energy to escape from the liquid surface into the air as water vapor.

hope this helps

Answer:

Q.

Why do we need to break apart the food we eat?

answer choices

so it can fit in our stomachs

so our bodies can use the nutrients from the food

so liquids can be separated from solids

so that our enzymes have something to do

2nd option

Where does digestion begin?

answer choices

mouth

stomach

large intestine

small intestine

first option

Q.

Chewing is an example of what kind of digestion?

answer choices

dental

fragmentary

chemical

mechanical

last option

If you wanted to find the glands that produce salivary amylase, where would you look?

answer choices

mouth

throat

intestines

stomach

first option

Place in order:

A. food enters large intestine

B. food enters small intestine

C. food enters esophagus

answer choices

A B C

C B A

C A B

B A C

2nd option

Hydrochloric acid can burn your skin yet it exists in your stomach. How can this be?

answer choices

small intestines absorb the acid

stomach lining protects you against burns

food in stomach absorbs the acid

the acid in your stomach is different from the acid in a chemistry lab

2nd option

What is chyme?

answer choices

a type of digestive enzyme

what food is called after it has been digested by the stomach

a chemically active part of the small intestine

a passage that leads from small to large intestine

2nd option

Q.

What might happen if you had your pancreas removed?

answer choices

your intestines might have trouble breaking down food

your stomach might have trouble producing hydrochloric acid

you would not be able to chew properly

you would have trouble producing saliva

first option

Q.

What is the main function of villi?

answer choices

to move food from the stomach to the small intestine

to absorb nutrients into the bloodstream

to absorb water from chyme

to move food from small intestine to large intestine

2nd option

Q.

What might happen if your large intestine did not absorb water from chyme?

answer choices

you couldn't digest food

you wouldn't be able to go to the bathroom

you'd become dehydrated

solid waste wouldn't be moved to the rectum

3rd option

Explanation:

I hope this helps

I got my answers in quiziz

Mole is the ratio of the mass to the molar mass of the substance and its unit is mol. The moles of isopropanol in the sample are 1. 31 moles.

Moles are the unit of measurement of the smallest entity of atoms, molecules, and compounds.

Given,

Mass of isopropanol (m) = 78. 6 g

Molar mass of isopropanol = 60. 1 g/mol

Moles of isopropanol is calculated as:

[tex]\begin{aligned} \rm moles (n) &= \rm \dfrac{mass}{molar \; mass}\\\\&= \dfrac{78.6}{60.1}\\\\&= 1.31\;\rm moles\end{aligned}[/tex]

Therefore, moles of isopropanol are option b. 1.31 moles.

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Acid rain removes nutrients from soil and Ocean waters become more acidic.

Ocean waters become more acidic when carbon dioxide from the atmosphere dissolves in seawater because the carbondioxide reacts with water produces carbonic acid.

When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain.

Learn more about atmosphere here: https://brainly.com/question/24925283

Answer:

How do changes in the atmosphere from burning fossil fuels affect plant life? Select the two correct answers.

-Acid rain removes nutrients from soil.

-Increased ozone levels slow plant growth.

What happens when carbon dioxide from the atmosphere dissolves in seawater?(1 point)

-Ocean waters become more acidic

Which of the following chemicals are pollutants released when people burn fossil fuels? Select the two correct answers.(1 point)

-nitrogen dioxide

-sulfur dioxide

How does the use of fossil fuels affect the cryosphere?(1 point)

-Higher levels of greenhouse gases in the atmosphere cause sea ice to melt.

Why are rising carbon dioxide levels in the atmosphere harmful?(1 point)

-Carbon dioxide traps heat in Earth's atmosphere.

Explanation:

The mass defect for the isotope thorium-234 if given mass is 234.04360 amu is 1.85864 amu.

Atomic mass (A) of any atom will be calculated as:

A = mass of protons + mass of neutrons

In the Thorium-234:

Number of protons = 90

Number of neutrons = 144

Mass of one proton = 1.00728 amu

Mass of one neutron = 1.00866 amu

Mass of thorium-234 = 90(1.00728) + 144(1.00866)

Mass of thorium-234 = 90.6552 + 145.24704 = 235.90224 amu

Given mass of thorium-234 = 234.04360 amu

Mass defect = 235.90224 - 234.04360 = 1.85864 amu

Hence required value is 1.85864 amu.

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Answer:

Explanation:

At the outer zone of candle flame, there are more oxygen available for the combustion reaction. So the flame is yellow in color.

The answer is D. yellow.

Answer:

B. blue

Explanation:

The candle's flame is divided into three zones: blue on the outside, yellow in the midst, and black on the inside. This is the result of the wax that is formed after the meltdown of the candle.

I am joyous to assist you at any time.

Explanation:

the sulfur ato is in group 6 of the periodic table. In order to become an ion the ato needs to gain 2 electrons so it has a full outer shell of electron and is stable. so the atom S goes to S2+ + 2e

A. I not sure kinda. Hopefully it's correct

Answer:

Temporary in nature.

No new substance is formed.

Explanation:

Temporary in nature: Does not affect the internal structure of a substance, only the molecules are rearranged.

No new substance is formed: Most of the physical changes are reversible. We can obtain the substance back even after the change.

hope this helps

have an awesome day -TJ

Answer:

The curved arrow mechanism for the reaction as described is as represented in the attached image.

Nitriles, upon reaction with LiAlH4 can be converted to 1° amines.

Opon occurrence of this reaction, the hydride nucleophile attacks the electrophilic carbon in the nitrile to form an imine anion. Once stabilized by a Lewis acid-base complexation the imine salt can accept a second hydride to form a dianion.

On this note, the nitrile reduction of 4-methyl pentanenitrile and lialh4, followed by the addition of acid to give the major product is as represented in the attached image.

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From the table showing the data involving the neutralization reaction between HCl and NaOH, the concentration of the HCl solution would be 0.864 M

From the available data:

Volume of acid used = 0.0351 - 0.0131 = 0.022 L

Volume of base used = 0.0575 - 0.0385 = 0.019 L

Concentration of base = 1.00 M

Number of moles of acid and base = 1

Using the equation:                      CaVa/CbVb = Na/Nb = 1

Ca = 1x0.019/0.022 = 0.864 M

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It's sunny in new york, but it is cool, we will expect to find lizard under a rock or in a hole in the ground, where temperature is more than outside.

Lizards are not easily survive in the winter season as they are cold blooded animal, so their body will not active in the winter season.

During the winter season or in the cold weather, lizards will go to the places where they feel less cooling. And these places be like inside the rocks, under a hole, under the ground, in the trunks of trees, etc. due to high temperature.

Hence, options (1) and (4) are correct.

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The percent yield obtained from the stoichiometry of the reaction when the moles of the reactants and products are known.

Stochiometry gives the relationship between the mass and mole or moles and volume in a reaction.

Q1)

K2PtCl4 + 2NH3 ----> Pt(NH3)2Cl2 +2KCl

Number of moles of NH3 = 34.5 g/17 g/mol = 2.03 moles

2 moles of NH3 yields 2 moles of KCl

2.03 moles  of NH3 yields 2.03 moles  of KCl

Theoretical yield of KCl =  2.03 moles * 75 g/mol = 154 g

Again,

2moles of NH3 yields 1 mole of Pt(NH3)2Cl2

2.03 moles  of NH3 yields 2.03 moles  * 1/2 = 1.015 moles

Mass of Pt(NH3)2Cl2 = 1.015 moles * 301 g/mol = 306 g

% yield =  76.4 g/306 g * 100/1 = 25%

Q2)

H3PO4 + 3 KOH ------> K3PO4 + 3 H2O

Number of moles of H3PO4  = 49.0 g/98 g/mol = 0.5 moles

If  mole of H3PO4  yield 1 mole of K3PO4

0.5 moles of H3PO4  yield 0.5 moles of K3PO4

Mass of K3PO4  = 212 g/mol * 0.5 moles = 106 g

Percent yield = 49.0 g/106 g * 100 = 46%

Q3)

Al2(SO3)3 + 6 NaOH ------> 3 Na2SO3 + 2 Al(OH)3

Number of moles of Al2(SO3)3 = 389.4 g/294 g/mol = 1.32 moles

If 1 mole of Al2(SO3)3 yields 3 moles of  Na2SO3

1.32 moles of Al2(SO3)3 yields 1.32 moles  * 3 moles/1 mole = 3.96 moles

Mass of Na2SO3 = 3.96 moles * 126 g/mol = 498.96 g

Percent yield = 212.4 g/498.96 g * 100/1 = 43%

Q4)

Al(OH)3(s) + 3 HCl(aq) -------> AlCl3(aq) + 3 H2O(l)

Number of moles of Al(OH)3 = 50.3 g/78 g/mol = 0.64 moles

If 1 mole of Al(OH)3 yields 1 mole of AlCl3

0.64 moles of Al(OH)3 yields 0.64 moles of AlCl3

Mass of AlCl3 = 133 g/mol * 0.64 moles = 85 g

Percent yield = 39.5 g/85 g * 100 = 46%

Q5) K2CO3 + 2HCl --------> H2O + CO2 + 2KCl

Number of moles of K2CO3 = 34.5 g/138 g/mol = 0.25 moles

1 mole of K2CO3  produces 2 moles of KCl

0.25 moles of K2CO3  produces 0.25 moles * 2 moles/1 mole = 0.5 moles

Mass of KCl = 0.5 moles * 75 g/mol = 37.5 g

If 1 mole of K2CO3  yields 1 mole of H2O

0.25 moles of K2CO3  yields 0.25 moles of H2O

Mass of H2O = 0.25 moles  * 18 g/mol = 4.5 g

Percent yield = 3.4 g/4.5 g *100 = 76%

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Answer:

Aquatic life

Elevation

Salinity

Temperature

Explanation:

Aquatic life- animals living in water use up dissolved oxygen.

Elevation- the amount of oxygen in elevation increases.

Salinity- Salty water holds less oxygen than fresh water.

Temperature- cold water holds more dissolved oxygen than warm water.

answer: the oject would break because of the amount of cooling added to the mass  so after five minutes it would start to crust a little bit. and the temprature would decrese jarastically

Explanation:

yes

Answer:

Molybdenum is M, Einsteinium is E, and N is Nitrogen. Lastly, S is sulfur.

Answer:

turn it

Explanation:

Accurate information

Answer:

For The first one I think its the + if not try -
For the second one I believe its the first - sign

Explanation:

Answer:

Photosynthesis is the process by which carbon dioxide and water are converted into oxygen and glucose. The plant consumes glucose as food, and oxygen is produced as a by-product. During cellular respiration, oxygen and glucose are converted to water and carbon dioxide. Water and carbon dioxide are by-products of the process, while ATP is the energy that is transformed. Water, carbon dioxide, and energy in the form of sunshine are all inputs in photosynthesis, and the outputs are glucose and oxygen.

Answer:

photosynthesis takes carbon dioxide from our atmosphere and turns it into oxygen.  A plant requires sunlight, water, and carbon dioxide to make both sugar and oxygen. . Input:  For photosynthesis to take place, water from the roots, carbon dioxide from the air, and energy from the sunlight are needed. Output: Photosynthesis creates glucose (sugar) used for/stored as food and releases oxygen into the air.

Explanation:

75% dominant and 25% resistive

The Change in Gibb's free energy, ΔG for the reaction at 298K is; -56.92KJ.

It follows from the Gibb's free energy formula as expressed in terms of Enthalpy and Entropy that;

On this note, it follows that;

Hence, the Gibb's free energy for the reaction is;

Remarks: The question requires that we determine the Gibb's free energy for the reaction at 298K.

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The Gibbs free energy for the reaction Br²(g) Cl²(g)⇌2BrCl(g) is -56.92 KJ.

It's the total work done in a closed thermodynamic system.

By the formula of Gibbs free energy

[tex]\rm \Delta G = \Delta H - T \Delta S[/tex]

The H is 14.6 KJ/mol

The change in temperature is 0.24

Putting the values in the equation

[tex]\Delta G = 14.6 - (298 \times 0.24)\\\\ \Delta G = 14.6 - 71.52\\\\ \Delta G = -56.92KJ[/tex]

Thus, the Gibbs free energy for the reaction is -56.92 KJ

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#SPJ4

The melting point is the temperature a substance must reach to go into its liquid phase (or solid) and a boiling point is the temperature a substance must reach to go into its gas phase (or liquid). For example, water must be 0ºC to melt or freeze and 100ºC to boil.

Answer:

It would require 80 g of NaOH .

Explanation:

Answer:

D. Weathering breaks parent material into smaller pieces.

Explanation:

I believe it is D. because weathering breaks down and loosens it into smaller pieces.

I hope it helps! Have a great day!

Muffin ^^

Answer:

Your answer would be:
D.) Weathering breaks parent material into smaller pieces.

Explanation:

Weathering breaks down and loosens the surface minerals of rock. The broken rocks are transported to another place where it decomposes and forms soil. Therefore weathering is important for soil formation. Without it, there will be likely less soil.



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#TheWizzer

Gas law gives the relation between the volume, moles, pressure, and temperature of the gas. The air pressure at the top of the mountain is 0.945 atm.

Gas law gives the direct relationship between the pressure and the volume of the gas with that of the temperature of the gas.

Given,

Initial pressure = 1.0 atm

Initial volume = 0.985 L

Initial temperature = 298.15 K

Final pressure = ?

Final volume = 1.030 L

Final temperature = 295.15 K

The final pressure at the mountain top is calculated as:

[tex]\begin{aligned} \rm \dfrac{P_{1}V_{1}}{T_{1}} &= \rm \dfrac{P_{2}V_{2}}{T_{2}}\\\\\dfrac{1 \;\rm atm \times 0.985 \;\rm L}{ 298.15 \;\rm K} &= \;\rm \dfrac{P_{2} \times 1.030 \;\rm L}{295.15\;\rm K}\\\\&= 0.945 \;\rm atm\end{aligned}[/tex]

Therefore, the pressure on the top of the mountain is 0.945 atm.

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