in titration, 25 mL of 0.2M NaOH neutralizes 20mL of HCl, what is the concentration of the HCl?

Explanation:

According to kinetic molecular theory,changes of the state of matter occur when energy is added or removed from a substance

According to the Kinetic-Molecular Theory, changes of the state of matter occur when energy is added or removed from a substance. The addition of energy makes particles move more, pushing them apart and weakening the bonds between them. Removing energy makes particle movement slow down, re-forming the bonds.

Answer:

1. Boron B 13 2 Non-Metal

2. Aluminium Al 13 3 Metal

3. Tin Sn 14 5 Metal

4. Helium He 18 1 Non- Metal

5. Neon Ne 18 2 Non- Metal

6. Calcium Ca 2 4 Metal

7. Francium Fr 1 7 Metal

8. Gold Au 11 6 Metal

Answer:

The oceans are the very foundation of human life. life itself arose from the oceans. The oceans are vast, covering about 140 million square miles, some covering 72 percent of the earth's surface.

Explanation:

The net force on particle 3 due to the presence of particle 1 and particle 2 on the same straight line is 50.5 N to the right.

The force between the two particles is determined from Coulomb's law as shown below;

F = kq₁q₂/r²

F(1,2) = -(9 x 10⁹ x 28.1 x 10⁻⁶ x 25.5 x 10⁻⁶) / (0.3)²

F(1,2) = - 71.66 N

F(2,3) = + (9 x 10⁹ x 25.5 x 10⁻⁶ x 47.9 x 10⁻⁶) / (0.3)²

F(2,3) = + 122.15 N

The net force on particle 3 is determined as follows;

F(net) = 122.15 N - 71.66 N

F(net) = + 50.5 N

Thus, the net force on particle 3 due to the presence of particle 1 and particle 2 on the same straight line is 50.5 N to the right.

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Answer:

In fact, the inhibitor and substrate don't affect one another's binding to the enzyme at all. However, when the inhibitor is bound, the enzyme cannot catalyze its reaction to produce a product. Thus, noncompetitive inhibition acts by reducing the number of functional enzyme molecules that can carry out a reaction.

Water will move into the cell because of lower concentration of water inside the cell as compared to outside.

Water has a tendency to move across a membrane from a lower osmolarity to a higher osmolarity which means from higher concentration region to the lower concentrated region.

So we can conclude that water will move into the cell due to lower concentration of water inside the cell as compared to outside.

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Answer:

If you're from study island, the answer is D. Water will move out of the cell.

Explanation:

I got it on study island and this was right.

Answer:

The 3 stressers are 1. Adding or removing reactants or products. 2. Changing the total pressure or volume. 3. changing the tempature of the system.

Explanation:

All three of these are stressers that can be applied.

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Answer: if anyone needs it <3

Explanation:

Answer:

342g/mol

Explanation:

Molar mass of carbon=12, hydrogen=1 and oxygen=16

therefore C12H22O11=12(12)+22(1)+11(16)

=144+22+176

=342g/mol

When the pressure of a gas is decreased from 3.40 atm to 2.60 atm, the temperature of the gas will decrease from 60.0 degree celsius to 45.88 degree celsius.

Gay -Lussac law states that the pressure and temperature is in direct proportions. Thus, pressure increases with an increase in temperature. The relation can be mathematically expressed as follows:

P/T = a constant. Hence,

P1/T1 = P2/T2

The initial pressure of the sample is given, 3.46 atm and the initial temperature is 60 °C. The final temperature of the gas when gas the expand to the lower pressure of 2.60 atm is calculated as follows:

[tex]T_{2} = \frac{P_{2}T_{1}}{P_{1}}[/tex]

    = (60 °C× 2.60 atm) / 3.40 atm

    = 45.88 °C.

Hence, the final temperature of the gas which is expanded from the pressure of 3.40 atm to 2.60 atm with an initial temperature of 60 °C is  45.88  °C.

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Answer:

A. would be your answer

Explanation:

Decomposers are especially important in retaining nutrients in their cells thus preventing loss of those nutrients from the root zone.

In an ecosystem, the decomposing web is important because decomposers help remove waste and use that energy to provide food for other animals.

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass  which is present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

c changes in energy causes matter to change

The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH

Hydrolysis is a chemical reaction which water molecule break down one or more chemical bonds. This is use for substitution, elimination, and solubility.

Hydrolysis depend on the pH, solubility and chemical constituent of the substance.

Therefore, The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH

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Magnesium and Calcium Oxide

Trick : Reactants are always on left

Answer:

magnesium and calcium oxide

Answer:

The correct answer is coats the pathogen exterior so that it is recognized by the host's phagocytes. :)

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Explanation:

Good question!

When you react an acid with a base,the pH of the product is determined by the concentrations of the reactants (the acid and the base)

If both reactants (acid and base) are strong,the pH of the product is 7

If the acid is stronger than the base,the pH of the product will be less than 7

If the base is stronger,the pH of the product will be greater than 7

I hope this helps

Answer:

Chemical that can be mixed with another chemical to reduce the dangerous of a specific chemichal

The solubility of the gas if the pressure is changed to 100 kPa is 0.742 g/L

As the pressure of a gas increases, the solubility increases, and as the pressure of a gas decreases, the solubility decreases.

Thus, Solubility varies directly with Pressure

If S represents Solubility and P represents Pressure,

Then we can write that

S ∝ P

Introducing proportionality constant, k

S = kP

S/P = k

∴ We can write that

[tex]\frac{S_{1} }{P_{1} } = \frac{S_{2} }{P_{2} }[/tex]

Where [tex]S_{1}[/tex] is the initial solubility

[tex]P_{1}[/tex] is the initial pressure

[tex]S_{2}[/tex] is the final solubility

[tex]P_{2}[/tex] is the final pressure

From the given information

[tex]S_{1} = 0.890 \ g/L[/tex]

[tex]P_{1} = 120 \ kPa[/tex]

[tex]P_{2} = 100 \ kPa[/tex]

Putting the parameters into the formula, we get

[tex]\frac{0.890}{120}=\frac{S_{2}}{100}[/tex]

[tex]S_{2}= \frac{0.890 \times 100}{120}[/tex]

[tex]S_{2}= 0.742 \ g/L[/tex]

Hence, the solubility of the gas if the pressure is changed to 100 kPa is 0.742 g/L

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Answer:

Natural sources include decomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.

Explanation:

Answer:

[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]

Explanation:

Write the reaction of HF (a weak acid) with water:
[tex]\displaystyle \text{HF}_\text{(aq)} + \text{H$_2$O}_\text{($\ell$)} \rightleftharpoons \text{H$_3$O}^+_\text{(aq)} + \text{F}^-_\text{(aq)}[/tex]

Recall that the equilibrium constant expression for an equilibrium reaction is the product of the concentration of the products over the product of the concentration of the reactants raised to their respective coefficients.

The equilibrium constant expression for this equation will hence be:

[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]

Note that pure solids and liquids are not included in the equilibrium expression.

In conclusion:

[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]

Answer:

O 392 g

Explanation:

39.2 grams of oxygen (O2) can be produced.

The concept stoichiometry is used here to determine the grams of oxygen produced. The amount of oxygen produced from the decomposition of 244 grams of potassium chlorate is 96.0 g . The correct option is C.

The stoichiometry is an important concept in chemistry which helps us to use the balanced chemical equation to calculate the amount of reactants and products. Here we make use of the ratios from the balanced equation. It help us to understand how much substance is needed or present.

Here the balanced reaction is:

2 KCIO₃(s) + 2 KCl(s) + 3 O₂(g)

2 moles of KCIO₃ = 2(39 + 35.5 + 3 × 16) = 245 g

3 moles of O₂ = 3 × 2 × 16 = 96 g

245 g KCIO₃ produces 96 g O₂

Therefore 245 g gives 96 × 244/245 = 95.6 g ≈ 96.0 g

Thus the correct option is C.

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Based on the titration curve of the monoprotic acid, pKa of the monoprotic acid is closest to 8.0.

A titration curve of an acid is a curve obtained from the plot of the pH against the amount of base added.

The titration curve of an acid reveals its pKa.

The pKa corresponds to the midpoint of titration when equal concentrations of the acid and base have reacted.

From the titration curve above, the pKa of the monoprotic acid is closest to 8.0.

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Answer:

The answer is A. It must have a medium

Explanation:

With out a medium the wave will not travel at all.

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Answer:

d.have a mass of 1 amu..

Explanation:

Does not match a as the answer for a is electrons B.electron circle around the nucleus because neutrons are inside the nucleus.C.proton and neutrons make the nucleus so the only answer left is .d .which is correct

Answer:c are the only are the only particle that form the nucleus

Explanation:

Answer:

it says tick the box next to the correct answer so it'd be right to tick the last box:

The particles of the gas slow down

Answer:

A. The mass of reactants is the same as the mass of products