Select all the correct answers.
What do scientists use to communicate extremely small measurements?
unit prefixes
A. base units
B. physical models
C. graduated cylinders
D. scientific notation

Answer:

shows how anything like each thing is composed of for instance see how water is made of: hydrogen and oxygen which makes it a compound

The elements are the basic things by which everything in the world is build up. Different elements combine to form compounds. There are various kinds of inorganic and organic compounds around us that create the matter.

Elements are the basic things of any substance in the world. There are 118 known elements which can be found in the modern periodic table. These elements include metals, gases, and semi metals.

Atoms of same elements forms molecules. Atoms of different elements combines to form the compounds. There are various types of compounds such as ionic compounds, covalent compounds, coordination complex etc.

Water is a compound formed from the elements hydrogen and oxygen. The table salt we use every day is a compound, sodium chloride. Similarly we can find there are many compounds that we use everyday are creating the matter in the world.

Find more on elements:

https://brainly.com/question/13025901

#SPJ3

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

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.

Learn more about moles here:

https://brainly.com/question/7210732

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.

To know more about lizards, visit the below link:

brainly.com/question/407800

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:

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

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: 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

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.

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

More on neutralization reactions can be found here: https://brainly.com/question/4612545

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.



Have a great rest of your day
#TheWizzer

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:

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:

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.

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.

Read more on Gibb's free energy;

https://brainly.com/question/13765848

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

Learn more about Gibbs Free energy

https://brainly.com/question/13318988

#SPJ4

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.

To know more about Atomic mass (A), visit the below link:

https://brainly.com/question/801533

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

Answer:

ΔS=2.303 n Rlog(

V

1

​

V

2

​

​

)

=2.303×10×8.314log(

10

100

​

)=191.47 JK

−1

Thus ΔS=191.47JK

−1

Explanation:

Answer:

The key difference between dissociation and solvation is that dissociation is the breakdown of a substance into the atoms or ions from which the substance is made of whereas solvation is the dissolution of a substance in a solvent due to the attraction forces between solvent molecules and the components.

Explanation:

Solvation refers to the process of surrounding solute particles with solvent molecules, leading to the formation of a solution. Dissociation specifically refers to the breaking apart of ionic compounds or molecules into their constituent ions when dissolved in a solvent.

Solvation occurs due to the attractive forces between the solute and solvent molecules, such as dipole-dipole interactions or hydrogen bonding. The result of solvation is the formation of a homogeneous solution where the solute particles are evenly distributed at the molecular level within the solvent.

Ionic compounds are composed of positively charged cations and negatively charged anions held together by electrostatic forces. When an ionic compound is dissolved in a solvent, such as water, the solvent molecules interact with the compound's ions, pulling them apart and surrounding them.

To learn more about the solvation, follow the link:

https://brainly.com/question/1118783

#SPJ6

Answer:

D

Explanation:

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

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

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

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%

Learn more about percent yield: https://brainly.com/question/12704041?

Answer:

Dams can stop a place from flooding and give us electricity without creating pollution. It can also make a place dry and finish water for animals

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:

After the dillution of the solution, the wavelength of maximum absorption is decreased.

The wavelength of maximum absorption is the wavelength at which the solution absorbs the maximum amount of light. It is usually shown as a hump in the spectrum.

When the starting concentration of the  K2Cr2O7 is diluted, the wavelength of maxium absorption decreases.

Learn more about maximum absorption: https://brainly.com/question/26610701

Answer:

tap water Is the pure substance

Answer:

Ethanol is pure

Explanation:

Purity meaning homogenious molecules/atoms, steel is a mix of iron and carbon, tapwater has minerals in it + fluoride etc, petrol has oxane and ethanol in it. ethanol is only ethanol and is inherently pure

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

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.

Learn more about combined gas law here:

https://brainly.com/question/3050574