Why is it important that the di water you use to rinse is ice-cold?.

Answer:

C - 78.4L

Explanation:

Took the test.

Answer:

Explanation:

Thus the chemical formula for aluminium permanganate is formed by cross exchanging the coefficient of valencies of aluminium and permanganate (with each other). Thus the chemical formula for aluminium permanganate is represented as : Al(MnO4)3.

A compound that binds to a receptor but does not activate the neuron is known as an Antagonist.

A receptor is a large protein molecule on a neuron that gets activated when a ligand binds to it such as a drug or hormone, or when electrical impulses pass through it.

An antagonist is a drug or hormone that binds to receptor, but instead of activating the receptor, it blocks or dampens the activation of the neuron. Antagonist drugs are used to interfere with the normal function or operation of a protein receptor.

Depending on the nature of the antagonist or the receptor it's bound to, the effects of antagonists may be permanent or temporary.

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The end-products of glycolysis include Pyruvate, NADH, and ATP. Therefore, option C is the correct answer.

Glycolysis is the metabolic pathway that occurs in the cytoplasm of the cell, which plays a vital role in the energy production process. It is also known as the Embden-Meyerhof pathway, and it takes place in the absence of oxygen during cellular respiration.Glycolysis involves the breakdown of glucose into two three-carbon molecules called pyruvate. During the process, a net amount of two molecules of ATP, two molecules of NADH, and two molecules of pyruvate are produced.

The pyruvate is then transported to the mitochondria, where it is further broken down to generate more ATP molecules.

The overall reaction of Glycolysis is:

\(Glucose + 2 NAD^+ + 2 ADP + 2 Pi ⇒2 pyruvate + 2 ATP + 2 NADH + 2 H^+ + 2 H_2O\)

Therefore, The end-products of Glycolysis include: Two molecules of Pyruvate. Two molecules of ATP (Adenosine Triphosphate) are produced. NADH (Nicotinamide Adenine Dinucleotide), which is a high-energy electron carrier, is also produced in glycolysis. hence c option is correct .

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Answer:

what are the options

Explanation:

there are no options

SO₃ is an empirical formula for S₂O₆ and the correct option is option C.

The empirical formula of a compound represents the simplest, most reduced ratio of the atoms present in the compound. It shows the relative number of atoms of each element in the compound, without indicating the actual number of atoms. In other words, it gives the simplest whole number ratio of the elements in a compound.

To determine the empirical formula, the relative amounts of each element in the compound are expressed in terms of moles or mass. Then, the ratios of the moles or masses are simplified to their lowest whole number values.

Thus, the ideal selection is option C.

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The complete question is -

SO₃ is an empirical formula for which of the following?

A. S₄O₂

B. SO₄

C. S₂O₆

D. S₂O₃

Answer:

4) the one that is reduced, which is the oxidizing agent

Explanation:

An oxidizing agent is one that causes oxidation by gaining electrons from another atom/molecule.

Answer:

c

Explanation:

To find ∆H for the reaction Fe₂O₃(s) + 2Al(s) → Al₂O₃(s) + 2Fe(s) using Hess's Law, we need to use the given reactions (a) and (b) and manipulate them to obtain the desired overall reaction.

Given:

a. 2Al(s) + 3/2O₂(g) → Al₂O₃(s); ∆H = -1675.7 kJ

b. 2Fe(s) + 3/2O₂(g) → Fe₂O₃(s); ∆H = -824.2 kJ

To match the stoichiometry of the desired reaction, we need to multiply reaction (a) by 2 and reaction (b) by 2:

2a. 4Al(s) + 3O₂(g) → 2Al₂O₃(s); ∆H = 2*(-1675.7 kJ) = -3351.4 kJ

2b. 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s); ∆H = 2*(-824.2 kJ) = -1648.4 kJ

Now, we can add these manipulated reactions to obtain the desired overall reaction:

4Al(s) + 3O₂(g) + 4Fe(s) + 3O₂(g) → 2Al₂O₃(s) + 2Fe₂O₃(s)

To find the ∆H for the overall reaction, we add the ∆H values of the manipulated reactions:

∆H = (-3351.4 kJ) + (-1648.4 kJ) = -4999.8 kJ

Therefore, the ∆H for the reaction Fe₂O₃(s) + 2Al(s) → Al₂O₃(s) + 2Fe(s) using Hess's Law is -4999.8 kJ.

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Answer:

i think it is A

Explanation:

i got this answer from a good friend

The magma deep below Earth's surface cool slowly.Large crystals form results from magma cooling deep below Earth's surface. Therefore, option A is correct.

Magma is the molten or semi-molten natural material that gives rise to all igneous rocks. Magma can be found beneath the Earth's surface, and evidence of magmatism has been discovered on other terrestrial planets and natural satellites.

When magma slowly cools deep within the crust, the resulting rock is known as intrusive or plutonic. Because of the slow cooling, crystals can grow large, giving intrusive igneous rock a coarse-grained or phaneritic texture. Individual crystals in phaneritic texture can be seen with the eye.

Intrusive igneous rocks form when magma slowly cools and solidifies beneath the Earth's surface. Large, well-formed crystals are found in intrusive igneous rocks such as granite, gabbro, diorite, and dunite.

Thus, option A is correct.

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1.2 × 10²³ molecules are there in 24 grams of  FeF₃ molecule. 1 mole is equal to 6.023 × 10²³ particles.

A mole is a important unit of measurement that chemists use in calculation. 1 mole is exactly equal to the 6.023 × 10²³ particles.

The term mole is defined as the amount of substance containing 6.023 × 10²³ molecules.

First multiply the number of moles supplied by Avogadro's Number to detect how many molecules there are.

Moles are determined from the molecular weight.

For FeF₃ molecule,

55.8 + 3⋅19 = 116g/mole

24 gram /  116g/mole

= 0.207 moles of  FeF₃

= 0.207 moles × 6.023 × 10²³

= 1.2 × 10²³ molecules

Thus, in 24 grams of FeF₃ molecule 1.2 × 10²³ molecules are present.

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The molarity of the ethanol is 11.29M .

What is molarity ?

Molar concentration, also known as molarity, amount concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per litre, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most widely used unit for molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.

The mass of one mole of ethanol is 46.07 g/mol.

The number of mole in 50.500 g ethanol is 50.500/46.07 = 1.096158 mole.

We know that,

Mass = Density × Volume.

The final volume of the solution 750.0ml and the density of the solution is 1.20g/ml.

The mass of the solution is 1.20g/ml × 750.0ml = 900 gm.

The mass of water is (900-50.500) = 849.5 gm.

So the term molarity is defined as:

One of the most common units of concentration, expressed in M. It is defined as no moles of solute in 1 liter of solution.

The molarity of the solution is:

(1.09615 × 1000)/ 849.5  = 1.29M (approx.).

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Answer:

the water would rise above you and spill out

Explanation:

the water would form around you, because the human body is solid, and would take up some of the volume of the tub. the water then goes up due to the added volume.

Answer:

B.) –197.8 kJ

Balanced equation : 2SO₂(g) + O₂(g) → 2SO₃(g)

Given:

================================================================

products energy = reactant energy

-593.6 + O₂ = -791.4

O₂ = -791.4 - ( -593.6)

O₂ = –197.8 kJ

Answer:

Group C

Explanation:

Precision is how close the values are to each other

Answer:

D a substance that increases the rate of a reaction without being used up itself in a reaction.

Explanation:

Examples are

ammonia synthesis ==> iron

sulfuric acid manufacture ==> nitrogen(II) oxide, platinum

cracking of petroleum==> zeolites

hydrogenation of unsaturated hydrocarbons ==> nickel, platinum, or palladium

I hope it helps

Answer:

Hey there!

The correct answer would be D. "a substance that increases the rate of a reaction without being used up itself in a reaction."

Hope this helps :)

Charge carriers in a metal are electrons rather than protons because electrons are free to move and weakly restrained .

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Chemical change: A chemical reaction is the change of one chemical substance into another chemical substance. For instance: The rusting of iron, the curdling of milk, the digestion of food, breathing, etc.

What is a chemical reaction?

A chemical reaction is the change of one chemical substance into another chemical substance.

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Chemical  change is the change  chemical substance is transformed into another chemical substance.It is irreversible in  nature , for example Reaction of medicine in body , milk to curd etc.

1)Physical change temporary or reversible in nature but chemical change is irreversible in nature

2)In physical change there no new product is formed but in chemical change there formation of new product takes .

3) Physical change is change sin shape ,size or state for example freezing of water , melting of wax , and example of  Chemical change are Burning of  coal, digestion of food

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Answer:

A perfect mold of a dinosaur bone

The following qualities must be present in a cutting tool:

1. Hot Hardness

2. Hardiness

3. Resistance to Wear

4. Chemical Inertness or Stability

5. Resistance to Shock

6. Reduced Friction

7. Affable Price.

Heat is produced during the cutting of metal. Nearly 600°C to 1800°C is a high raised temperature, and the tool material must be able to keep its hardness, wear resistance, and strength at this temperature. The fluctuation in hardness of several tool materials with an increase in temperature .

The fundamental principle of all metal cutting operations is to gradually push a cutting tool with one or more cutting blades through the surplus material on the work piece. While power is applied, a machine tool and its accessories securely hold the work piece and the tool.

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Answer:

Lithium = 3 electrons (Neutral atom)

Potassium = 19 electrons

Correct Question:-

How many outermost shell/orbit contains electrons do lithium and potassium have.

Lithium Atomic number - 3

Ans :- 1 electron

(K -2 , L - 1)

potassium Atomic number - 19

Ans :- 1 electron

(K - 2 , L - 8 , M - 8, N -1)

As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.

Increasing the temperature of a solvent can increase the rate at which a solid dissolves. This is because an increase in temperature causes the solvent molecules to move more rapidly, which in turn increases their kinetic energy and ability to interact with the solute particles.

As a result, the solute particles are more likely to break free from their crystal lattice and become surrounded by the solvent molecules.

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Answer:

A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.

Explanation:

The more surface area of a solute that is exposed, the faster the solute will dissolve. Like sugar for an example, sugar cubes take longer to dissolve as compared to regular ground up sugar.

And I took the test and got this right!

Reagents required for conversion of clohexene to cycloexane is H2,Pt.

Functions do reagents serve in chemistry:

A chemical reaction is used to confirm the detection of another substance and is referred to as a "substance or compound that is added to a system in order to bring a chemical reaction or is added to check whether a reaction has occurred or not."

Reagents required for conversion of clohexene to cycloexane is H2,Pt.

Hydrogenation of cyclohexene in presense of Pt catalyst gives cyclohexane .

cyclohexene + H2  -----(Pt)----> cyclohexane .

Pt is acting here as a catalyst.

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N₂(g) + 3H₂(g) → 2NH₃(g) If we have 12 moles of hydrogen gas, 4.0 moles of nitrogen gas will need to completely react with hydrogen gas.

The amount of substance of a system which includes as many elementary entities is called as mole.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's constant.

In Haber process, N₂ reacts with H₂ and formed NH₃.

The balanced equation for the Haber process is as follows:

N₂(g) + 3H₂(g) → 2NH₃(g)

The stoichiometric ratio of H₂ and N₂ is 3 : 1

Therefore, reacted moles of N₂ = reacted moles of H₂ / 3

So, moles of N₂ = 12.0 mol / 3

= 4.0 mol

Thus, 4.0 moles of N₂ is needed to react with 9.0 moles of H₂.

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The key differences between the Articles of Confederation and the U.S Constitution is the article of confederation is sovereignty in states and the constitution  is expand the governments authority.

The document created the better system of government for the new nation is the US constitution.

The Article of confederation , the state have stronger power than the central power and in the US constitution , the power of central government is stronger than the states. The important development was the establishment of three departments. There are three departments of government that is legislative , executive and judicial.

Thus, The key differences between the Articles of Confederation and the U.S. Constitution is the article of confederation is sovereignty in states and the constitution  is expand the governments authority.

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Answer:

Explanation:

Temperature: increasing the Temperature increases the solubality

Polarity: increase of polarity increases the soluablity of polar solutes

The larger the molecules of the solute are, the larger is their molecular weight and their size. It is more difficult it is for solvent molecules to surround bigger molecules.

For majority of solid and liquid  solutes, pressure does not affect solubility. it is applciaable only for gasesous solute

Hope this helps you

Answer:

H2SO4 + 2NaOH ----> Na2SO4 + 2H2O

Explanation:

This is balanced equation

Answer:

Balanced equation have equal number of atoms of different elements in the side of reactants and products.

Answer:

- A balanced chemical equation has an equal numbers of atoms of different elements in the side of reactants and products.

- An unbalanced chemical equation has an unequal number of atoms of one or more elements in the reaction.

Explanation:

To prepare 500. 00 mL of a 0. 0500 M NaCl Solution of 0. 8291 M NaCl 30.48 ml volume is needed

M1=0.82

V1=?

M2=0.05

V2=500 ml

M1V1=M2V2

0.82×V1=500×0.05

V1=30.48 ml

The area occupied within an object's boundaries determines its volume in three dimensions. On occasion, it is referred to as the object's capacity. The volume of an object can be used to calculate how much is needed to fill it; for instance, how much water is needed to fill a bottle, aquarium, or water tank. A sphere is the most basic and prevalent type of three-dimensional shape. We come across spheres all the time in the form of balls, globes, ornamental lights, oranges, etc.

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