) Which direction does thermal energy flow in the following diagram? *
2 points

Heat flows from the ice cream to the hand.
Heat flows from the hand to the ice cream.
The system is too cold for heat to move.

Answer:

Titrant and analyte is a pair of acid and base. ... Equivalence point: point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution. At the equivalence point in an acid-base titration, moles of base = moles of acid and the solution only contains salt and water.

Explanation:

With Hexane of 1.00 ml and 1.00 ml of hectane at 298, the calculated

C6H14 = C6H14/C6H14+C7H16

1mol/1mol+1mol = 1/2 = 0.5 mol

1+1 x 8.3145J x 298 x 0.5ln0.5 + 0.5ln0.5

= 4955.442 0.6932

= 3435J

convert to KJ

G mix = 3.43

The Gibbs energy is therefore  3.43KJ/mol

-(1+1 x 8.3145J x 298 x 0.5ln0.5 + 0.5ln0.5)

S mix = -3.43 KJ/mol

3.43/298 = 11.5

The enthalpy of the solution

3.43-3.43 KJ/mol

H mix = 0

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Chemical indicators are the chemical reagents that show the change in reaction by changing color. Chemical indicators must be chosen with a narrow pH range.

Indicators are the solutions or the substances used for the qualitative and the quantitative measurement by a change in color because of the absence or the presence of the sample concentration.

The chemical indicators cannot detect the exact pH and should be used with a narrow range of pH.

Therefore, option C. the narrow range of pH is the disadvantage of chemical indicators.

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Answer:

C (They must be selected for a narrow ph range.

Explanation:

Edg 2022

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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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:

should be 2M

Explanation:

:)

the total mass is 187g. The total mass of the reactant is always equal to total mass of the products.

explanation:

as per the given details, the reactant involved in the reaction are 37g of magnesium and 150g of sulfuric acid . the total of the reactant is 187g.

13.5 mL of 0.0339 M H₂SO₄ is titrated with 21.8 mL of 0.0419 M LiOH.

Titration is a process of chemical analysis in which the quantity of some constituent of a sample is determined by adding to the measured sample an exactly known quantity of another substance with which the desired constituent reacts in a definite, known proportion.

H₂SO₄ + 2 LiOH ⇒ Li₂SO₄ + 2 H₂O

0.0218 L × 0.0419 mol/L = 0.000913 mol

The molar ratio of H₂SO₄ to LiOH is 2:1.

0.000913 mol LiOH × (1 mol H₂SO₄/2 mol LiOH) = 0.000457 mol H₂SO₄

[H₂SO₄] = 0.000457 mol/0.0135 L= 0.0339 M

13.5 mL of 0.0339 M H₂SO₄ is titrated with 21.8 mL of 0.0419 M LiOH.

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Answer:

to release free nitrogen into the atmosphere. This is the answer.

Answer:

to convert free nitrogen into usable nitrogen

Explanation:

got it right on the test boi

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

I answered your question in the photo sent

Good luch

1nm=10^-6 cm.

476 nm = 4.76E-5 cm

Explanation:

Halogens tend to gain one electron so that they can get a full outer level and be stable.

Answer:

When calcium carbonate reacts with hydrogen chloride, it reacts to form calcium chloride, carbon dioxide, and water. If this reaction occurs with 51.6% yield, what mass of carbon dioxide will be collected if 16.93 g of CaCO3 is added to sufficient hydrogen chloride

Answer:

Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces. These forces keep particles close together.

Explanation:

hope it helps U

Answer:

Explanation:

Molarity = number of moles / volume

If 550 mL of a 3.50 M KCl solution are set aside and allowed to evaporate until the volume of the solution is 275 mL, which is half of 550 mL, the molarity of the solution with the same number of moles of KCl is 3.5 * 2 = 7.00 M

The molarity of the solution will be 7 M.

The total count of moles of solute per liter of a particular solution is known as a solution's molarity.

The volume of just an object is a measurement of how much space it takes up.

Molarity of the solution can be determined by the formula:

[tex]M_{1} V_{1} = M_{2} V_{2}[/tex]

where, M = molarity of solution. V = volume.

Given data:

[tex]M_{1}[/tex] = 3.50 M

[tex]M_{2}[/tex] = ?

[tex]V_{1}[/tex] = 550 mL

[tex]V_{2}[/tex] = 275 mL

Now, put the value of given data in molarity equation.

[tex]V_{2} = M_{1} V_{1} /M_{2}\\V_{2} = (3.50 M) (550 mL) / (275 mL)\\V_{2} = 7 M[/tex]

Therefore, the molarity of the solution will be 7 M.

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Mass of sodium :- 23 grams

Mass of Chlorine :- 35.5 grams

Mass of NaCl :- 58.5 grams

mass given :- 25 grams

moles :- 0.432 ( given mass/ ionic mass)

[tex]molarity = \frac{moles}{vol} \\ molarity = \frac{0.432}{2} \\ molarity = 0.216 \: mole{l}^{ - 1} or \: molar[/tex]

Answer: The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.

hope this helps!

Answer:

6CO2 + 6H2O → C6H12O6 + 6O2

Explanation:

Answer:

Increasing the surface area of a reactant increases the frequency of collisions and increases the reaction rate. Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.

Explanation:

:)

The pH at equivalence point depends on the nature of the acid-base titration, and can either be acidic, basic, or neutral.

The equivalence point in a titration is the point at which equal amount of acid and base have reacted with each other.

The pH at equivalence point depends on the nature of the acids and bases being titrated.

pH at equivalence point will be:

Therefore, the pH at equivalence point depends on the nature of the acid-base titration.

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Based on the dissolution equation of BaSO4, the solubility product, Ksp, expression of BaSO4 is: [Ba^{2+}] × [SO4^{2-}]

The solubility product, Ksp, of a substance is an equilibrium constant which expresses the product of the concentration of ions produced by a solute.

The solubility of a solute depends on temperature, thus solubility product also depends on temperature.

The balanced equation for the dissolution of barium sulfate is given below:

The solubility product for barium sulfate is given as;

Ksp = [Ba^{2+}] × [SO4^{2-}]

Therefore, the solubility product, Ksp, expression of BaSO4 is: [Ba^{2+}] × [SO4^{2-}]

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291.15 Kelvin

I hope this helps

Answer:

18 degrees Celsius = 291.15 Kelvin

Explanation:

The formula for finding Kelvin through Celsius is by adding 273.15 to the Celsius. In this case, it is 18 + 273.15 = 291.15

:)

Answer:

0.2 moles

Explanation:

The equation is given by;

2HCl => H² + Cl²

According to stoichiometry;

[tex] \frac{n \: hcl}{2} = \frac{n \: h {}^{2} }{1} [/tex]

[tex]nhcl = 2 \times nh {}^{2} [/tex]

To produce 0.62 moles of H² gas we need,

nHCL=2×0.62=1.24 moles

Using the relation;

number of moles:Number of atoms/Avogadro's constant

We can then say;

N(numb. of atoms)=n×Na

Number of atoms=1.24×6.02×10²³

Number of atoms=7.5852×10²³ atoms

Answer:

I believe is the correct answer

Explanation:

a

Answer:

The final temperature of the sample is 21.004 °C

Explanation:

The molar heat capacity for iron is 25.130 J/g.c joules per gram per Kelvin.

The amount of heat needed to increase one temperature of one mole of a substance is called molar heat capacity.

By the formula [tex]\rm \Delta T^\circ c = \Delta Tk[/tex]

Given that c = 0.45 J/g.C

Molar mass of iron is 55.845

Then putting the values in the equation

[tex]c= 0.45 \times 55.845 \\\\c= 25.130 \;J/g.^\circ c[/tex]

Thus, the molar heat capacity for iron is 25.130 J/g.c

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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

Answer:

Atomic weight.

Explanation:

Hope this helps you!

Answer:

The arrow would be facing upwards from the counter to the icecube.

Explanation:

Heat flows from the counter to the ice causing the molecules in the counter to move more slowly.

An ice cube is placed on the counter, The arrow would be facing upwards from the counter to the ice cube. This is the property of water.

It is tasteless, odorless, or transparent, nucleus of the oxygen atom and the electrons strongly than the nuclei of the hydrogen atoms.

In water molecule oxygen is electro negative than hydrogen, results in the development of a partial negative charge on the oxygen and a partial positive charge on the hydrogen end.

Water have a strong cohesive property where the attraction of molecules with other molecules of the same kind is referred to as cohesion.

Surface tension of the water  is defined as  the tendency of  the surface to resist rupture when they are subjected to stress due to cohesive forces.

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Some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.

Hydrocarbons are any organic compounds that contain hydrogen and carbon in its structure.

Hydrocarbons can be grouped into the following based on whether they contain single or double bonds:

Therefore, it can be said that some hydrocarbons are regarded as unsaturated because they contain double or triple bonds between adjacent carbon atoms.

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