What is the molarity of a solution of NaOH that contains 0.350 moles of sodium hydroxide in
1.25 liters of solution?

Answer:

d

Explanation:

Answer:

Option D. Al is above H on the activity series.

Explanation:

The equation for the reaction is given below:

2Al + 6HBr —> 2AlBr₃ + 3H₂

The activity series gives us a background understanding of the reactivity of elements i.e how elements displace other elements when present in solution.

From the activity series of metals, we understood that metal higher in the series will displace those lower in the series.

Considering the equation given above, Al is higher than H in the activity series. Thus, the reaction will proceed as illustrated by the equation.

Therefore, we can conclude that the reaction will only occur if Al is higher than H in the activity series.

The gas would occupy approximately 3.00 L at 24.0 °C and 670 torr.

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas at different conditions. The combined gas law is expressed as:

(P1 × V1) / (T1) = (P2 × V2) / (T2)

where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.

Using the given values, we can plug them into the equation and solve for V2:

(P1 × V1) / (T1) = (P2 × V2) / (T2)

(934 torr × 4.76 L) / (279.25 K) = (670 torr × V2) / (297.15 K)

Simplifying and solving for V2, we get:

V2 = [(934 torr × 4.76 L) / (279.25 K)] × (297.15 K / 670 torr)

V2 ≈ 3.00 L

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Answer:

Hubble's law says that the universe is expanding outward.

Explanation:

Actually Hubble's law was discovered before the Big Bang theory was formulated. The Big Bang Theory is an attempt to explain the observations that led to Hubble's Law.Before the 1900s the theory was that the universe was eternal and self existent. The idea was that the universe was in a steady state having always existed and would always continue to exist. Albert Einstein even changed the equations in his general theory of relativity to reflect the idea of a steady state. Later he called putting in a fudge factor to result in a steady state the worse mistake of his life.

Hubble observed that most of the universe has a red shift indicating that the universe is expanding and moving away from itself. The further out that the universe is observed the faster it is moving apart.

These observations were inconsistent with a steady state universe.

The Big Bang theory extrapolated backwards. If the universe is expanding and spreading out from itself then further back in time the universe was closer together. The Theory explained Hubble's observations by the idea that at the beginning of time ( for our universe) all the matter and energy were together in one place.

This super dense ball of matter and energy then exploded outwards creating space and time as it is presently observed. The question was would the forces of gravity and black holes bring the matter and energy back together again. The answer found in 1998 was no. The rate of the expansion of the universe is increasing not slowing down and the universe will not collapse back into the super dense ball of matter that it began as.

The Big Bang Theory postulated based on the empirical evidence that our universe had a beginning and it will eventually cease to exist. The conclusion based on Hubble's observations is that matter and energy are not eternal and self existent.

We can be able to determine the amount of toxic lead in the water by thee use of  atomic absorption spectrophotometry.

A toxic metal is known as any metal that is able to affect the health of people. We know that toxic metals are mostly the metals that are in the group of the heavy metals.

Now we know lead as a metal that is able to cause brain damage especially in children. This is why it is very important that there should be a thorough examination in order to know the amount of lead that is present in water.

There are several methods that could be applied in the determination of lead and one of the most common methods is by the use of atomic absorption spectrophotometry which is able to detect even the minutest amount of the led in solution.

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Answer:

1.92704e24 atoms

Explanation:

Using Avogadro's number, you can set up a stoichiometric equation to find the number of atoms.

There are 1.926 × 10²⁴ atoms in 3.2 moles of sulfur (S).

The number of atoms in a substance can be calculated by multiplying the number of moles by Avogadro's number.

Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³.

According to this question, there are 3.2 moles of sulfur. The number of atoms can be calculated as follows:

no of atoms = 6.02 × 10²³ × 3.2

no of atoms = 19.26 × 10²³

no of atoms = 1.926 × 10²⁴

Therefore, 1.926 × 10²⁴ atoms are in 3.2 moles of sulfur.

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Answer:

0.725 kg

Explanation:

Step 1: Given data

Step 2: Calculate the mass of the softball

We will use the following expression.

K = 1/2 × m × v²

m = 2 K / v²

m = 2 × 145 J / (20.0 m/s)²

m = 0.725 kg

The mass of the softball is 0.725 kg.

Its b beacuse if you C4 its a high active poly faber

Explanation:

Im right

Answer: the pressure releases gas. The two most abundant gases are sulfur dioxide and carbon dioxide, and if levels of these gases increase,

Explanation:

There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.

The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.

Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:

Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)

Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2

Moles of Al3+ = 0.84 mol Al3+

Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.

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Answer:

The mass of sucrose in grams required to make  7% weight volume in 100 mL solution of water is 7g

Explanation:

The percentage weight of a solution is mostly referred to as percentage weight per volume (% w/v). The formula for this is

% w/v = g of solute/100 mL of solvent

sucrose is the solute here while water is the solvent. The mass (in grams) of the solute is the unknown

7% = g of solute/100 mL of water

where 7% equals/the same with 7/100;

7/100 = g of solute/100 mL of water

g of solute = 7 × 100/100

g of solute = 7 g

The mass of sucrose in grams required to make  7% weight volume in 100 mL solution of water is 7g

Answer:

2547.4g

Explanation:

44.4×(23+35,5)

The vapor pressure of butane in the lighter at 25.0 °C is approximately 0.493 atm.

We are given that the boiling point of butane at 1 atm pressure is -1.0 °C, which is equivalent to 272.15 K. At this temperature, the vapor pressure of butane is 1 atm. We are also given that the enthalpy of vaporization of butane is 22.44 kJ/mol and R = 8.314 x 10⁺³ kJ/mol K.

We want to find the vapor pressure of butane at 25.0 °C, which is equivalent to 298.15 K. Substituting these values into the Clausius-Clapeyron equation, we get:

ln(P2/1 atm) = (-22.44 kJ/mol / (8.314 x 10⁻³ kJ/mol K)) * (1/298.15 K - 1/272.15 K)

Solving for P2, we get:

P2 = 1 atm * e⁻²² kJ/mol / (8.314 x 10⁻³ kJ/mol K)) * (1/298.15 K - 1/272.15 K)]

P2 = 0.493 atm

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Answer:

CaCO3,which is Calcium Carbonate. It’s equivalent mass is 50 g. Explanation:-. Mass of CaCO3=Mass of 1 atom of Calcium (Ca)+Mass of 1 atom of Carbon (C)+Mass of 3 atoms of Oxygen (O). Mass of 1 atom of Calcium=1×40g=40g. Mass of 1 atom of Carbon=1×12g=12g. Mass of 3 atoms of Oxygen=3×16g=48g.

Explanation:  Hope this helps :)

Answer:

B

Explanation:

B is the only answer choice that provides a rate

(like 3ºC/ hr meaning 3ºC per hour)

all the other answer choices don't have a /hr

so best answer choice is B

Answer:

The correct answer is - C6H5MgBr + CO2  → C7H6O2 (without solvent)

Explanation:

Grignard reagents are the reagents formed by the chemical reaction between magnesium with an alkenyl or alkyl halide which are represented by the chemical formula RMgX where X stands for the halogen, and R is an alkyl or aryl group. These alkyl or aryl groups are based on the benzene ring.

The nature of these reagents are nucleophilic react with electrophiles such as epoxides or carbonyl groups. The formation of benzoic acid is possible with the reaction of the Grignard reagent with the carbon dioxide In H3O+ to form benzoic acid with MgBrOH.

C6H5MgBr + CO2 → C7H6O2

The right brain part of the brain is affected by a smell, a song, or a photograph.

The right brain is more intuitive and visually oriented. It is occasionally referred to as the analog brain. It thinks less logically and with more creativity. According to out-of-date research by Sperry, the right brain aids in creativity.

Posterior parietal cortex of the parietal lobe of the brain mainly deals with the photographs.

The olfactory bulb, a structure in the front of the brain, processes smells before sending data to other regions of the body's central nervous system.

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The right brain part of the brain is affected by a smell, a song, or a photograph.

What is Right Brain?

The right brain is more intuitive and visually oriented. It is occasionally referred to as the analog brain. It thinks less logically and with more creativity. According to out-of-date research by Sperry, the right brain aids in creativity.

Which part of brain deals with photograph?

Posterior parietal cortex of the parietal lobe of the brain mainly deals with the photographs.

Which part of brain deals with Smell?

The olfactory bulb, a structure in the front of the brain, processes smells before sending data to other regions of the body's central nervous system.

Copper oxide, CuO has a relative formula mass of 80.

What is the Relative Formula mass?

This refers to the total of the relative atomic masses of the atoms in the numbers seen in the formula.

This refers to the relative mass of atoms when compared with the carbon-12 atoms Ar. Relative formula mass is a measure of relative mass, thus it has no unit.

O=16 and Cu=64

copper oxide, CuO=  (1 * 64) + (1 * 16)

                              = 64      +  16

                               =80

Where,

1 = The subscript value of the element present.

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Rate = 1.321M/s[H₂CO₃]¹ ; k = 1.32M/s

Answer:

a. The Zn and HCl both retained their identity.

Answer:

f = 0.65 hz

Explanation:

Given that,

The distance between adjacent crests, wavelength = 2.4 m

6 crests are observed to move past a given point along the medium in 9.1 seconds.

We need to find the frequency of these waves.

We know that,

Frequency = no. of waves per second.

\(f=\dfrac{6}{9.1}\ Hz\\\\=0.65\ Hz\)

So, the frequency of these waves is equal to 0.65 Hz.

Answer:

Composition: All hydrocarbons are made up of only two types of atoms: carbon and hydrogen. They are like building blocks that contain carbon and hydrogen stuck together.

Organic Nature: Hydrocarbons are special because they are part of a group of compounds that come from living things or things that were once alive. They have carbon and hydrogen in them, which is what makes them different from other types of compounds.

Explanation:

The number of moles of H₂O in the thimble of water is approximately 0.00664 mol. The answer is option B) 6.6 x 10⁻³

The number of molecules in a substance is related to Avogadro's number (6.022 x 10²³ molecules/mol) by the formula:

number of molecules = number of moles x Avogadro's number

We are given that there are 4.0 x 10²¹ molecules of water. To find the number of moles of water, we need to rearrange the formula and solve for moles:

number of moles = number of molecules / Avogadro's number

number of moles = 4.0 x 10²¹ molecules / 6.022 x 10²³ molecules/mol

number of moles = 0.00664 mol

The number of moles of H₂O in the thimble of water is approximately 0.00664 mol. The answer is option B) 6.6 x 10⁻³

The quantity of substance in a system is represented by a measurement unit called a mole. A material is said to have one mole if there are exactly as many atoms, molecules, or ions in one mole of it as there are in 12 grams of carbon-12.

It is practical to quantify substance concentrations in chemical reactions and other chemical processes using moles. It enables chemists to deal with quantifiable amounts of substances, like grams, and to quickly convert these amounts to a standard unit of measurement, like moles.

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Given what we know, we can confirm that in the situation given in this question, the ice cube placed into the pitcher of water will melt quicker than the cube in the cup of water.

In order to melt, the ice must receive heat from the water around it.

The hotter the water is, the more heat the ice can receive.

Given that the cup has a low amount of water, it will quickly cool down, slowing the melting process of the ice.

The pitcher, however, has more molecules of water that are able to give heat to the ice, meaning that the ice can melt faster.

Therefore, given that the pitcher contains more water, it will be able to lose more heat before to the ice cube than the cup of water and thus melt the cube faster.

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Answer:

To lower the activation energy of a reaction

Explanation:

i just took the test and got it right ...... i hope this helps :)