1: calculate the ph of a 0.25m solution of h3o+
2: calculate the ph of a 6.3x10-8m solution of h3o+
3: look at your answer for 4 and 5 which one is a base?
4: look at 4 and 5 which one is a strong acid
please show your work

Answer

changing from liquid to gas

Explanation

changing from liquid to gas

a) The concentration of sugar in the solution is 200 g/L, total mass is 0.3kg and density us 1g/mL.
b) We need 20 g of sugar to prepare a glass of 100 mL from the solution.

Concentration in g/L,

Mass of sugar in solution = 60 g

Mass of water in solution = 240 g

Total mass of solution = 60 g + 240 g = 300 g = 0.3 kg

Concentration of sugar = (mass of sugar / total volume of solution) * 1000

= (60 g / 300 mL) * 1000 = 200 g/L

Total mass of the solution = 300 g or 0.3 kg

Density of the solution = total mass of the solution / total volume of the solution

= 300 g / 300 mL = 1 g/mL

The concentration of sugar in the solution is 200 g/L.

The volume of solution needed for a glass of 100 mL is,

Volume of solution = (100 mL / 1000) L = 0.1 L

Mass of sugar in the solution needed for a glass of 100 mL = concentration * volume

= 200 g/L * 0.1 L = 20 g

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Heat change, ΔH, required to change 52.2 grams of liquid water into steam from room temperature (25 Celsius) to 115 Celsius is 135915.228 J.

The heat change required to change 52.2 grams of liquid water into steam from room temperature (25 Celsius) to 115 Celsius is determined as follows:

Heat change required, ΔH = ΔH₁ + ΔH₂ + ΔH₃

ΔH₁ is heat required to change liquid water at 25°C to water at 100°C

ΔH₁ = mass * specific heat capacity * temperature change

specific heat capacity of water = 4.184 J/g/K

ΔH₁ = 52.2 * 4.184 * (100 - 25)

ΔH₁ = 16380.36 J

ΔH₂ is the heat required to convert water at 100°C to steam at 100°C

ΔH₂ = mass * latent heat of vaporization of water

latent heat of vaporization of water = 2260 J/g

ΔH₂ = 52.2 * 2260

ΔH₂ = 117972 J

ΔH₃ is the heat required to change steam at 100°C to water at 115°C

ΔH₁ = mass * specific heat capacity * temperature change

specific heat capacity of steam = 1.996 J/g/K

ΔH₁ = 52.2 * 1.996 * (115 - 100)

ΔH₁ = 1562.868 J

Heat change required, ΔH = 16380.36 J + 117972 J + 1562.868 J

Heat change required, ΔH = 135915.228 J

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Answer:

The volume increases,

Final volume is 2.1L

Explanation:

Based on Boyle's law, the absolute temperature of a gas is directly proportional to the volume of the gas.

As the balloon change increases its temperature, the volume increases

The Boyle's equation is:

V1T2 = V2T1

Where V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas.

Replacing:

V1 = 2.0L

T2 = 35°C + 273.15 = 308.15K

V2 = ?

T1 = 25°C + 273.15 = 298.15K

2.0L*308.15K = V2*298.15K

2.1L = V2

Answer:

increase,2.1L

Explanation:

Explanation:

Potassium oxide is an ionic compound formed by combining potassium and oxygen. It carries the chemical formula K2O. Potassium cannot be found free because it is too reactive. It has valency +1 and combines readily with oxygen atoms forming K2O.

Answer:

The Correct answer is

K+O2------>K2O

balancing it will be

4K+O2----->2K2O

Tundra soils are formed at high latitudes which leaves the tundra always very cold. Tundra soils are generally frozen, and are classifed as Gelisols (this means that permafrost are within 100 cm of the soil surface). These permafrost are as a result of the freezing by winter of the underground water that was accumulated in summer. These soils freeze and thaw alot and as result of that, moisture do not permeate the soil easily. Also, due to this harsh temperature and underground permafrost, most organisms that died in the tundra are preserved within the soil.

The volume of the irregular solid from the image that have been shown is  12 mL

To obtain the volume of the irregular solid;

a. Measure the initial volume of water in the cylinder.

b. Carefully lower the irregular solid into the water, ensuring it is fully submerged without trapping any air bubbles.

c. Record the new volume of water in the cylinder.

d. The volume of the irregular solid is equal to the difference between the final and initial water volumes.

The volume is;

32 mL - 20 mL = 12 mL

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The equation that is balanced is:

3H₂SO4 + 2Fe → Fe₂(SO4)3 + H₂

An equation is considered balanced if it has the same number of atoms of each element on both sides of the equation. In this equation, the number of hydrogen (H), sulfur (S), oxygen (O), and iron (Fe) atoms are equal on both sides.

If there are no inequalities, the chemical equation is said to be balanced. A balanced equation obeys the law of conservation of mass. Here among the given options, the balanced equation is C₃H₈ +50₂ → 4H₂O + 3CO₂. The correct option is B.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are balanced is defined as the balanced equation. The amount of reactants and products on both sides of the equation will be equal.

The numbers which are added to balance the chemical equation are called the coefficients. The coefficients are added in front of the formula of the chemical compounds.

The balanced equation for the given reaction is:

C₃H₈ +50₂ → 4H₂O + 3CO₂

Here the number of 'C', 'H' and 'O' on both sides of the equation are equal.

Thus the correct option is B.

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Explanation:

Copper has an atomic number of 29, so it contains 29 protons and 29 electrons. ... The atomic weight of copper is 64; it has 29 protons and 35 neutrons.

Answer:

So one mole of Fe2O3 contains two moles of Fe3+ ions.

Explanation:

As there is an internal mole ratio of 2:3

It means that there are 2moles of iron within every mole of iron(III) oxide.

Iron III oxide is an ionic compound composed of Fe3+ ions and O2- ions. According to the formula, there are three O2- ions for every two Fe3+ ions.

Extra:

One 'unit' of Fe2O3 has two Fe3+ ions and three O2- ions, hence a dozen Fe2O3 contains two dozen Fe3+ ions and three dozen O2- ions, and a mole Fe2O3 contains two moles Fe3+ ions and three moles O2- ions.

Answer:

d. NH4+ and C2H3O2- ions

Explanation:

When ammonium acetate (NH4C2H3O2) is mixed with water, it dissociates into its ions. In this case, it dissociates into NH4+ (ammonium ion) and C2H3O2- (acetate ion). Therefore, the solution will contain NH4+ and C2H3O2- ions dissolved in water.

The solution contains NH4+ and C2H302 ions. Among the given options, the correct answer is option d. It forms a solution containing NH4+ and C2H302 ions that are fully dissolved in the water.

When a chemist mixes ammonium acetate into 500 mL of water, the ammonium acetate (NH4C2H3O2) dissolves and dissociates into its constituent ions. This results in the formation of NH4+ ions (ammonium ions) and C2H3O2- ions (acetate ions) in the solution. Ammonium acetate is a salt that readily dissolves in water, dissociating into NH4+ and C2H302 ions. The aqueous solution will contain NH4+ ions and C2H3O2- ions, which are formed due to the dissociation of ammonium acetate in water. These ions will be dispersed throughout the solution and will not sink to the bottom.

In conclusion, when ammonium acetate is mixed into water, it forms a solution containing NH4+ and C2H302 ions that are fully dissolved in the water.

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Answer:

2Na + Br2 = 2NaBr

Explanation:

In order to balance a chemical equation you make the make sure both sides have the same number of atoms on each side, you do this by multiplying on both sides as if it was a algebraic equation.

Na+ Br2 = NaBr

Na × 2 = Na2

Na × 2 = Na2

Br × 2 = Br2

2Na + Br2 = 2NaBr

Hope this helps.

Answer:

0.017 M

Explanation:

The reaction that takes place is:

First we calculate how many KOH moles reacted, using the given volume and concentration:

As 1 mmol of KOH reacts completely with 1 mmol of HNO₃, in 14.9 mL of the HNO₃ solution there were 0.255 HNO₃ mmoles.

With that in mind we can calculate the concentration of the HNO₃ solution using the calculated number of moles and given volume:

According to law of conservation of matter , the mass of the trees got converted  fro one form of matter to another.

According to law of conservation of matter, it is evident that matter is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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The number of people (or adults) in the population, N, has an evolutionary equivalent called Ne. whereas N determines the ecological effects of population size simulation,

Evolutionary consequences (rates of genetic diversity loss and increase in inbreeding; relative effectiveness of selection) depend on Ne, and Emergency Medical Care Providers in Critical Access Hospitals and ambulance services across the entire state receive technologically advanced simulation training.Ne=(4*Nm*Nf)/(Nm+Nf) is the formula to get the effective population size. The formula Ne = 4NmNf/(Nm + Nf) can be used to calculate the effective population size in this circumstance, where Nm and Nf are the number of men and females, respectively. demonstrates the connection between Ne and Nf in a population of 1,000 reproducing people simulation.

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Answer:

the answer is the 3rd one, though I'm not 100% sure on it, sorry

Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

Answer:

Explanation:

it is tough question plz give me some time i would give you your ans soon

Answer:

\(\boxed {\boxed {\sf 120 \ or \ 117 \ grams \ H_2O \ depending \ on \ significant \ figures }}\)

Explanation:

We want to convert from moles of water to grams of water.

First, find the molar mass of water (H₂O) Look on the Periodic Table for the masses of hydrogen and oxygen.

Next, add up the number of each element in water. The subscript of 2 comes after the H, so there are 2 moles of hydrogen.

Finally, add the molar mass of 2 hydrogen and 1 oxygen.

Next, find the grams in 6.5 moles.

Use the molar mass we just found as a ratio.

\(molar \ mass \ ratio: \frac{18.015 \ g \ H_2O}{1 \ mol \ H_2O}\)

We want to find the grams in 6.5 moles. We can multiply the ratio above by 6.5

\(6.5 \ mol \ H_2O * \frac{18.015 \ g \ H_2O}{1 \ mol \ H_2O}\)

Multiply. Note that the moles of H₂O will cancel each other out.

\(6.5 * \frac{18.015 \ g \ H_2O}{1}\)

\(6.5 * {18.015 \ g \ H_2O}\)

\(117.0975 \ g \ H_2O\)

If we want to round to the technically correct significant figures, it would be 2 sig figs. The original measurement, 6.5, has 2 (6 and 5).

\(\approx 120 \ g \ H_2O\)

Answer:

double

Explanation:

.

1.  the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.  the final concentration of KOH after adding 550 mL of water to 125 mL of 3.01 M KOH solution is approximately 0.557 M.

1.) If 125 mL of water is added to 45.3 mL of a 0.71 M NaOH solution, the resulting solution will be a diluted NaOH solution. The addition of water will increase the total volume while reducing the concentration of NaOH. To determine the final concentration of NaOH, we need to consider the conservation of moles.

First, let's calculate the moles of NaOH in the initial solution:

moles of NaOH = volume (in L) × concentration (in M)

moles of NaOH = 0.0453 L × 0.71 M = 0.0321433 moles

After adding 125 mL (0.125 L) of water, the total volume of the solution becomes 0.0453 L + 0.125 L = 0.1703 L.

To find the final concentration, we divide the moles of NaOH by the total volume:

final concentration of NaOH = moles of NaOH / total volume

final concentration of NaOH = 0.0321433 moles / 0.1703 L ≈ 0.189 M

Therefore, the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.) If 550 mL of water is added to 125 mL of a 3.01 M KOH solution, the resulting solution will also be a diluted solution. Again, we will apply the conservation of moles to determine the final concentration of KOH.

First, calculate the moles of KOH in the initial solution:

moles of KOH = volume (in L) × concentration (in M)

moles of KOH = 0.125 L × 3.01 M = 0.37625 moles

After adding 550 mL (0.55 L) of water, the total volume of the solution becomes 0.125 L + 0.55 L = 0.675 L.

To find the final concentration, divide the moles of KOH by the total volume:

final concentration of KOH = moles of KOH / total volume

final concentration of KOH = 0.37625 moles / 0.675 L ≈ 0.557 M

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The molality of potassium chloride in a solution that which contains 25 g of potassium chloride in 120 g of water is  2.618 molal.

Molal concentration is defined as a measure by which concentration of chemical substances which are  present in a solution are determined. It is defined in particular reference to solute concentration  which is present in a solution . Most commonly used unit for molar concentration is moles/liter.

The molal concentration depends on the  change in volume of the solution which is mainly due to thermal expansion. Molal concentration is calculated by the formula, molal concentration=mass/ molar mass ×1/mass of solvent in kg.

On substitution in formula, molal concentration= 25/79.55×1/0.120=2.618 molal.

Thus, the molality is 2.618 molal.

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Answer:

electrical and heat energy

Explanation:

Answer:

Heat and Light

Explanation:

C on usatp

The amount of energy required to melt 64 g of methane at 90 k is 3.784 KJ.

The energy required to melt 64 g of methane (CH4) at 90 K can be calculated using the heat of fusion, which is the amount of heat energy required to change the state of a substance from solid to liquid at a constant temperature.

Heat of fusion, also known as the enthalpy of fusion, is the amount of heat energy required to change the state of a substance from solid to liquid at a constant temperature. It is typically expressed in units of joules per mole (J/mol) or kilojoules per mole (kJ/mol).

Heat of fusion is an important physical property of a substance, as it determines the amount of energy required to melt a solid at a given temperature. It is used in many applications, including thermodynamics, process design, and energy storage.

First, we need to convert the amount of methane from grams to moles:

64 g CH4 / 16 g/mol = 4 mol CH4

Next, we can use the heat of fusion to calculate the energy required to melt the methane:

Heat of fusion = moles * heat of fusion per mole

Heat of fusion = 4 mol * 0.946 KJ/mol = 3.784 KJ

Therefore, the energy required to melt 64 g of methane at 90 K is 3.784 KJ.

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The structure of  n-ethyl-1-hexanamine or n-ethylhexan-1-amine is shown in the image attached below.

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The warm air in Earth’s atmosphere and the warm water in Earth’s oceans sink instead of rise.

The heat energy can be transported by convection by the temperature differential between the two portions of the fluid. Hot fluids tend to ascend due to the temperature differential, but cold fluids prefer to sink. This causes a convection current to form inside the fluid.

Differential heating causes convection currents. Warmer (less dense) stuff rises, whereas cooler (more dense) material sinks. This movement is responsible for the formation of circulation patterns known as convection currents in the Earth’s atmosphere, ocean, and mantle.

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Answer:

reactants of photosynthesis= carbon dioxide, water, and sunlight.

Products of cellular resperation= water and carbon dioxide and energy

Explanation:

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{2.4 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.4}{6.02} \\ = 0.398671096...\)

We have the final answer as

Hope this helps you