How many grams of oxygen are required to produce
9 grams of water at standard conditions?
2 H, + 0, → 2H20
grams​

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%

In an ecosystem, possible sources of groundwater contamination caused by human activity are excessive use of fertilizers and chemicals seeping in to the ground.

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 system 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 present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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hi I I  don’t know

Explanation:

hi

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:

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

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

Answer:

using three significant figures, to match the data

v = 51.4

p = -0.999

Using three significant figures, to match the data, v = 51.4 and p = -0.999.

If a variable increases by a fixed amount over an equal amount of time, it will grow linearly. Real-world problems frequently show nonlinear progression.

The exponential function and the power function are two other functions that can model data. If a fixed number higher than 1 is multiplied by a variable in equal intervals, the variable will expand exponentially.  

A power regression is one in which the explanatory variable is increased to a power and the response variable is proportionate to it.

We can build the models similarly because exponents are used in both the exponential form and the power form. The log from both sides is first taken.  

Therefore, Using three significant figures, to match the data, v = 51.4 and p = -0.999.

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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:

Heat, Q = 3035.073 J

Explanation:

It is given that,

Mass of water, m = 15.5 g

Initial temperature, [tex]T_i=90^{\circ} C[/tex]

Final temperature, [tex]T_f=43.2^{\circ}[/tex]

The specific heat of water is, c = 4.184 J/ g°C

The heat removed or absorbed by water is given by formula as :

[tex]Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\Q=15.5\times 4.184\times (43.2-90)\\\\Q=-3035.073\ J[/tex]

So, the heat of 3035.073 J is removed from 15.5 g of water.

Answer:

ice age

Explanation:

An ice age is a long-term environmental change that could allow some organisms to flourish.

An ice age is a long period of decrease meant in the temperature of the Earth's surface and atmosphere, producing the presence or expansion of continental and polar ice sheets and alpine glaciers.

Earth's climate alternates between ice ages and greenhouse periods, in which there are no glaciers on the planet.

Sustainability is co-related with the processes of recycling, reorganizing, and rearranging the world around us, Nature and society's relationship, and the way we live and care about it, including our education and environment.

The statement is a definition of what sustainability means because it speaks of a capacity to survive, flourish, and adapt and noticed how the world has changed and the future is all about changing, even more, that is, the world will need to be sustainable to survive.

Hence, an ice age is a long-term environmental change that could allow some organisms to flourish.

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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:

Neutral ions

Explanation:

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

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:

Add 3.3g of NaOH to 550 mL of water.

Answer:

The equilibrium will shift to the left.

Explanation:

For an exothermic reaction, heat is a product. Therefore, increasing the temperature will shift the equilibrium to the left, while decreasing the temperature will shift the equilibrium to the right.

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.

Copper metal reacts with nitric acid but does not react with hydrochloric acid due to the difference in reactivity between the two acids. Nitric acid is a strong oxidizing agent, while hydrochloric acid is a weaker acid.

Copper metal reacts with nitric acid but does not react with hydrochloric acid due to the difference in reactivity between the two acids. Nitric acid is a strong oxidizing agent, meaning it readily donates oxygen atoms or accepts electrons from other substances. Copper is less reactive compared to hydrogen, so when it reacts with nitric acid, it displaces hydrogen from the acid, resulting in the formation of copper (II) nitrate, nitrogen dioxide, and water.

On the other hand, hydrochloric acid is a weaker acid and does not have strong oxidizing properties like nitric acid. Therefore, copper does not react with hydrochloric acid. Instead, metals like zinc or magnesium, which are more reactive, can react with hydrochloric acid to form hydrogen gas and the corresponding metal chloride.

Answer:

D) NaNO₃

Explanation:

In this case, to know this, we need to watch the solubility curve of each compound to know which one is saturated or unsaturated in this case.

As you can see in the curve attached, let's analize first what is an unsaturated solution.

An unsaturated solution is a solution where the quantity of solvent is in excess and the solute is completely dissolved in solution leaving no remains. This depends of the temperature of course. The solubility of one compound vary with the increase or decrease of temperature.

As you can see in the graph attached, what happens to the KCl?, we can see that a 40 °C, you just need around g of solute to be dissolved, and be saturated so, this is not the correct choice.

If you watch NaCl, has a similar behavior. You just need about 35 g of solute to be saturated.

Finally the KNO₃ just need 60 g of solute to be dissolved in solution, completely.

In the case of NaNO₃ we can see that at 40 °C it's not touching the curve, so we can assume that this is an unsaturated solution and it would be the correct choice.

Final answer:

An unsaturated solution is one in which more solute can still be dissolved in the solvent. In this case, the solution contains 90 grams of the salt dissolved in 100 grams of water. However, without knowing the solubility of each salt at 40ºC, we cannot determine which salt could form an unsaturated solution at that temperature.

Explanation:

An unsaturated solution is one in which more solute can still be dissolved in the solvent. In this case, the solution contains 90 grams of the salt dissolved in 100 grams of water. If the solution were saturated, it would contain the maximum amount of solute that can be dissolved at that temperature. Since the solution has less solute than the maximum solubility, it is an unsaturated solution.

To determine which salt it could be, we need to compare the solubility of each salt at 40ºC. Unfortunately, the information provided does not include the solubility data for the salts. Therefore, we cannot determine which salt could form an unsaturated solution at 40ºC based solely on the information given.

Answer:

Explanation:

as colors

Answer:4.5

Explanation:

14-9.5

pH can be defined as the degree of how acidic or basic a given solution is. pOH can be defined as the concentration of OH- ions in a given solution.

A solution with a pH of 9.50 has a pOH of 4.5

The formula to solve the above question is given as:

pH + pOH = 14

From the question,

pH = 9.50

Hence, 9.5 + pOH = 14

Subtract 9.5 from both sides

9.5 - 9.5  + pOH = 14 - 9.5

pOH =  14 - 9.5

pOH = 4.5

Therefore, a solution with a pH of 9.50 has a pOH of 4.5

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Answer:

A. 4500 mL

Explanation:

We need to use a version of the combined gas law, which states:

[tex]\frac{V_1}{n_1T_1}= \frac{V_2}{n_2T_2}[/tex] , where T represents temperature, V volume, and n moles

First, look at the initial values of n, V, and T:

- n: we have 10.0 grams of hydrogen, which we need to convert to moles. So: [tex]10.0g*\frac{1 mol}{2.02 g} =4.95molH_2[/tex]

- V: we have a volume of 5.0 L

- T: our temperature right now is 28.0°C, but we need it in Kelvins, so add 273: 28.0 + 273 = 301 K

Now look at the final values:

- n: our final number of grams is 8.5 grams of hydrogen, so we need to convert this to moles.

[tex]8.5g*\frac{1 mol}{2.02 g} =4.2molH_2[/tex]

- V: this is what we want to find

- T: our final temperature is 44.0°C; to convert it to Kelvins, add 273.

44.0 + 273 = 317 K

Put this altogether:

[tex]\frac{V_1}{n_1T_1}= \frac{V_2}{n_2T_2}[/tex]

[tex]\frac{5.0}{4.95*301}= \frac{V_2}{4.2*317}[/tex]

Multiply both sides by (4.2 * 317):

[tex]V_2[/tex] ≈ 4.5 L

However, the problem wants millilitres, so simply multiply 4.5 by 1000:

4.5 * 1000 = 4500

The answer is thus A.

Option (A) 4500 ml

Hope it helps✌️

Answer:

Look in the image:

Explanation:

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:

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!

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:

+60 kJ

Explanation:

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

Answer:

The balanced hemical equation is given below. 18 moles of oxygen are produced.

When 2 moles of Potassium chlorate decomposes to produce 2 moles of potassium chloride and 3 moles of oxygen gas. The balanced chemical equation for this decomposition reaction follows:

By Stoichiometry of the reaction,

2 moles of potassium chlorate produces 3 moles of oxygen gas

So, 12 moles of potassium chlorate will produce =  of oxygen gas.

Hence, 18 moles of oxygen gas will be produced.

planation:

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