How many moles are there in 2.35 grams of H2O?

Add 3.3g of NaOH to 550 mL of water.

Answer:

90%

Explanation:

Percentage yield = ?

Theoretical yield = 50g

Actual yield = 45g

To calculate the percentage yield of a compound, we'll have to use the formula of percentage yield which is the ratio between the actual yield to theoretical multiplied by 100

Percentage yield = (actual yield / theoretical yield) × 100

Percentage yield = (45 / 50) × 100

Percentage yield = 0.9 × 100

Percentage yield = 90%

The percentage yield of the substance is 90%

Answer:

Day and night. The Earth is a sphere, or ball, which spins round and round as it travels around the Sun. ... The side facing away is cooler and darker, and experiences night. Because the Earth is constantly spinning, the line between day and night is always moving around the planet.

Explanation:

Answer:

The Earth orbits the sun once every 365 days and rotates about its axis once every 24 hours. Day and night are due to the Earth rotating on its axis, not it's orbiting around the sun. The term 'one day is determined by the time the Earth takes to rotate once on its axis and includes both daytime and nighttime.

Explanation:

Answer:

D. 180.1 g/mol

Explanation:

Add up each of the masses of the elements in glucose and multiply them by the subscript number.

Carbon: 12.01 * 6 = 72.06

Hydrogen: 1.008 * 12 = 12.096

Oxygen: 16.00 * 6 = 96

72.06 + 12.096 + 96 = 180.156 g/mol ≈ 180.1 g/mol

*Molecular masses vary depending on which measurement / periodic table you use, so expect to be within a range, not exactly the same. My answer was closer to 180.2 g/mol, but it's still acceptable.

Answer:

D. 180.1 g/mol

Explanation:

ed tell chemistry

Answer:

2.63 atm.

Explanation:

Given,

Volume,V = 4.44 L

n = 0.481 mol of O₂

Temperature, T = 22.6°C = 22.6 + 273 = 295.6 K

Using ideal gas law

[tex]P = \dfrac{nRT}{V}[/tex]

[tex]P = \dfrac{0.481\times 0.0821 \times 295.6}{4.44}[/tex]

    P = 2.63 atm.

Pressure of the tank is equal to 2.63 atm.

Answer:

B

Explanation:

volume occupied by fixed amount of gas is directly proportional to its absolute temperature.

Final answer:

The Ideal Gas Law statement corresponding with Charles's Law is that decreasing the temperature of a gas will proportionally decrease its volume, as Charles's Law states that volume and temperature are directly proportional at constant pressure.

Explanation:

The statement about the Ideal Gas Law that is supported by Charles's Law is: B) If you decrease the temperature of a gas, its volume will decrease proportionally. Charles's Law states that the volume of a given amount of gas is directly proportional to its temperature in the Kelvin scale, assuming that the pressure is kept constant. This means that if the temperature of a gas is increased, its volume will increase as well, and conversely, if the temperature decreases, the volume will decrease.

Answer:

C

Explanation:  Some crops would be able to grow further north than normal.

The following is a benefit of climate change: Some crops would be able to grow further north than normal. The correct option is C.

Climate change is a change or shift in the temperature or pressure of the atmosphere. These changes are long-term and happen due to changes in the habit of humans. Due to the increasing population of humans, they are exploiting natural resources, and due to factories and industries, greenhouse gases are increasing in the environment and increasing the warmth of the earth.

One benefit of the climatic change is that the crops will grow to the north poles due to the warming of the area. North areas are cold and not suitable for growing crops.

Thus, the correct option is C. Some crops would be able to grow further north than normal.

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Answer:

Dust that blocks visible light is transparent to X-rays.

Explanation:

The bright center of the galaxy can be seen in both images, but the dark ring of dust on the left is absent in the X-ray image on the right. This means that dust that blocks visible light is transparent to X-rays.

Some, but not all, of the bright X-ray sources on the right are also visible on the left. This indicates that bright X-ray sources may be bright visible sources, or they may be very dark according to visible light.

Answer:

dust that blocks visible light is transparent to X-rays

Explanation:

just did the study island

Answer:

+60 kJ

Explanation:

Activation energy = PE(AB) - PE(A+B) = 100 -40 = +60 kJ

Answer:

Use the x method, cross over each charge.

Explanation:

[tex]K^{+1}[/tex] and [tex]Br^{-1}[/tex] the +1 and -1 cancel each other out, so it will be KBr

Answer:

25mL

Explanation:

Please see the step-by-step solution in the picture attached below.

Hope this can help you. Have a nice day!

25 mL of 2.0 M KOH are required to neutralize 50 mL of 1 M HCl due to the 1:1 reaction ratio and molarity calculations.

To determine how many milliliters of 2.0 M KOH are necessary to neutralize 50 mL of 1 M HCl, we first write the balanced chemical equation:

1. KOH(aq) + HCl(aq) → KCl(aq) + H2O(l)

Since the reaction ratio of KOH to HCl is 1:1, we can calculate the moles of HCl and thus the moles of KOH needed for neutralization:

Calculate moles of HCl: 50 mL × 1 M = 50 mmol of HCl

Calculate moles of KOH needed: 50 mmol of HCl × (1 mol KOH / 1 mol HCl) = 50 mmol of KOH

Convert moles of KOH to volume: 50 mmol / 2.0 M = 25 mL of KOH

Therefore, 25 mL of 2.0 M KOH are required to neutralize 50 mL of 1 M HCl.

Answer:

d

Explanation:

The effect of increasing the reaction temperature will increase FeCl₂⁺ (aq) concentration. Therefore, option (D) is correct.

An endothermic process can be defined as any thermodynamic process with an increase in the enthalpy of the system. In such a process, a closed system absorbs thermal energy from its surroundings.

An endothermic reaction will increase the temperature of the system and decrease the temperature of the surroundings. Whether a process can occur depends not only on the enthalpy change but on the entropy change and temperature.

Given, the chlorination of the iron (III) ion can be represented as:

Fe³⁺ (aq) + 2 Cl⁻ (aq) ↔ FeCl₂⁺ (aq)

Given, this reaction is an endothermic reaction, so on increasing the temperature will favor the forward reaction. Therefore, the yield of the product increases FeCl₂⁺(aq) concentration.

Therefore, the increase the concentration of the product in the forward reaction.

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Final answer:

Lilah will take 7 seconds to run 42 meters at a speed of 6 meters per second. This is a basic calculation in physics involving speed, distance, and time.

Explanation:

Distance = 42 meters

Speed = 6 m/s

The question about Lilah running 42 meters at 6 meters per second (m/s) is a straightforward physics problem that can be solved by dividing the total distance by the speed.

Therefore,

Time = distance / speed.

= 42/6

= 7

Calculations involving speed, distance, and time are common in many physics problems, whether it's a simple scenario like Lilah's run or a more complex situation such as a marathon runner's speed with uncertainties in distance and time.

Answer:

B. A hot liquid or air that expands, becomes less dense, and rises or becomes more dense and sinks.

Explanation:

Convection is the movement or transferring of heat in liquids.

Option A shows the definition of Radiation.

Option C shows the definition of Conduction.

Option D shows an example of Radiation.

The only option that shows heat moving in a liquid is option B.

Best of Luck!

Your answer is C (i am only writing this part because i dont wanna explain it bla bla bla bla bla bla bla)

Answer:

Neutral ions

Explanation:

Because they have a neutral charge They can only produce neutrally.

Answer:

chloroplasts and mitochondria are both organelles that are responsible for energy conversions within the cell. Chloroplasts use sunlight and water and carbon dioxide to produce glucose for plants (photosynthesis). On the other hand, mitochondria break down glucose molecules to produce cell energy in the form of ATP for both plants and animals (cellular respiration).

Explanation:

Photosynthesis and cellular respiration are almost opposite reactions.

Photosynthesis = 6H2O + 6CO2 + sunlight ---> C6H12O2 + O2

Cellular Respiration C6H12O2 + 6O2 --> 6CO2 + 6H2O +ATP

Without photosynthesis plants could not store the energy we use as food and produce oxygen for us

Without cellular respiration we would not be able to obtain energy and give CO2 back to the environment

Final answer:

Chloroplasts and mitochondria are organelles vital for energy conversion in plant and animal cells. Chloroplasts conduct photosynthesis to produce glucose, while mitochondria perform cellular respiration to generate ATP. Both have their own DNA, ribosomes, and double membranes, emphasizing the form follows function principle.

Explanation:

Chloroplasts and mitochondria are similar in their functions for plant and animal cells in that they both are involved in energy conversion processes within the cell. Mitochondria are found in both plant and animal cells and function in cellular respiration, a process that converts glucose and oxygen into ATP, which is the primary energy currency of the cell. Chloroplasts, on the other hand, are found only in plant cells and certain algae and are responsible for photosynthesis, the process that converts carbon dioxide, water, and light energy into glucose and oxygen.

The importance of these processes lies in the fact that photosynthesis provides the glucose that is necessary for cellular respiration. In turn, cellular respiration breaks down glucose to produce ATP, which powers cellular activities. It is this conversion of light energy into chemical energy, and then chemical energy into usable cellular energy, which sustains life in both plant and animal cells.

Answer:

2 M

Explanation:

The equation for molarity is "M = moles/liters"

Potassium chloride's atomic mass is 74.55, meaning one mole of KCl is equal to 74.55g. In the equation, 298g of KCl is being used. To find out how many moles this is, multiply 298g of KCl by (1 mol/74.55g of KCl) to get 4.0 moles. Now you can use the equation for molarity.

M = 4.0 moles/2 Liters

The molarity of the solution made by dissolving 298 g of KCl in enough water to make 2 L of the solution is 2 M

Mass of KCl = 298 g

Molar mass of KCl = 39 + 35.5 = 74.5 g/mol

Mole = mass / molar mass

Mole of KCl = 298 / 74.5

Mole of KCl = 4 moles

Volume = 2 L

Molarity = mole / Volume

Molarity of KCl = 4 / 2

Therefore, the molarity of the KCl solution is 2 M.

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Answer:

The concentration of hydroxide ions is 3.02*10⁻³ M

Explanation:

The pOH (or OH potential) is a measure of the basicity or alkalinity of a contamination and is defined as the negative logarithm of the activity of the hydroxide ions. That is, the concentration of OH- ions:

pOH= -log [OH-]

The pOH has a value between 0 and 14 in aqueous solution, the solutions with pOH being greater than 7 being acidic, and those with pOH less than 7 being basic.

If pOH= 2.52 then

2.52= -log [OH-]

[OH-]= 3.02*10⁻³ M

The concentration of hydroxide ions is 3.02*10⁻³ M

Answer:

a red flower with one part colored yellow

Explanation:

It neither decreases nor increases the chances of survival.

Answer:

c

Explanation:

i took the test

You'll have to record the observations in appropriate ways and organize them The way you collect your data should relate to how you're planning to analyze and use it These might for instance include entering numerical observations into a  Qualitative data are collected as descriptions anecdotes opinions quote

Answer:

I was doing this exact thing in school.

Explanation:

Answer:

About 0.1738 liters

Explanation:

Using the formula PV=nRT, where p represents pressure in atmospheres, v represents volume in liters, n represents the number of moles of ideal gas, R represents the ideal gas constant, and T represents the temperature in kelvin, you can solve this problem. But first, you need to convert to the proper units. 215ml=0.215L, 86.4kPa is about 0.8527 atmospheres, and 15C is 288K. Plugging this into the equation, you get:

[tex]0.8527\cdot 0.215=n \cdot 0.0821 \cdot 288\\n\approx 7.754 \cdot 10^{-3}[/tex]

Now that you know the number of moles of gas, you can plug back into the equation with STP conditions:

[tex]1V=7.754 \cdot 10^{-3} \cdot 0.0821 \cdot 273\\V\approx 0.1738L[/tex]

Hope this helps!

Answer:

A car traveling 25 KM/H

Explanation:

It has the largest mass and speed.

Answer: A car traveling 25 KM/H

Explanation: The faster an object is going the more the kinetic energy it's going to have. If there's more force on the object, there's more kinetic energy.

I hope this helps!

Answer:

-65kJ

Explanation:

It is possible to calculate the heat of a reaction by the sum of half-reactions, thus:

(a) A + 2B → C + D   ΔH = -20 kJ

(b) B → 2C + D    ΔH = -45 kJ

The sum of (a) + (b) gives:

(a) + (b) A + 3B → 3C + 2D ΔH = -20kJ - 45kJ = -65kJ

Thus, heat of reaction is -65kJ

Answer:

Sample Response: Yes, the law of conservation of momentum is satisfied. The total momentum before the collision is 1.5 kg • m/s and the total momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.

Explanation:

Sample Response since i just took it on Edg.

Answer:

Yes

Explanation:

Sample: Yes, the law of conservation of momentum is satisfied. The total momentum before the collision is 1.5 kg • m/s and the total momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.

Answer:

200 grams of NaOH are produced with the reaction of 5.00 moles of water

Explanation:

First of all you apply a rule of three to know the amount of moles of NaOH as follows: if 2 moles of water produce 2 moles of NaOH, 5 moles of water how many moles would they produce?

[tex]moles of NaOH=\frac{5 moles of water*2 moles of NaOH}{2 moles of water}[/tex]

moles of NaOH= 5

Being:

the molar mass of NaOH is: 23 g/mole + 16 g/mole + 1 g/mole= 40 g/mole

Then a rule of three applies as follows: if in 1 mole there are 40 g of NaOH, in 5 moles how much mass is there?

[tex]mass=\frac{5 moles*40g}{1 mole}[/tex]

mass= 200 g

200 grams of NaOH are produced with the reaction of 5.00 moles of water

The half-life of a radioisotope represents the time it takes for half of the atoms in a sample to decay.

The half-life of a radioisotope represents the time it takes for half of the atoms in a sample of the radioisotope to decay. It is a measure of the stability of the radioisotope and determines the rate of decay. For example, if the half-life of a radioisotope is 10 days, it means that after 10 days, half of the atoms in the sample would have decayed.

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Answer:

1. A

2. B

3. A

4. C

5. C

6. A

hi I I  don’t know

Explanation:

hi