Part A
Calculate the molarity of a solution prepared by dissolving 12.1
gg of Na2CrO4Na2CrO4 in enough water to produce a solution with a
volume of 690. mLmL .
Express the molarity to three significan

Answer:

Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another

Explanation:

energy cannot be created Or destroyed.

Answer:

B. Lava flows may cause tsunamis.

Answer:

ionic compounds are compounds that form when electrons are transferred from one atom to another, forming ions

Explanation:

"Ace chemists discovered the process" is generally the best style for interesting writing based on what has been covered in the text as well as the power points. Option B is correct.

This sentence uses active voice, which is generally considered more engaging and interesting than passive voice. It is also concise and clear in its message, avoiding unnecessary words like "responsible for" and "was made by".

"Ace chemists" is a phrase that refers to highly skilled or exceptional chemists. The term "ace" is often used informally to describe someone who is excellent or skilled in a particular field or activity. In the context of chemistry, "ace chemists" may refer to chemists who have made significant contributions to the field or who have exceptional skills and knowledge.

Hence, B. is the correct option.

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--The given question is incomplete, the complete question is

"Select the sentence that generally is the best style for interesting writing based on what has been covered in the text and the power points. group of answer choices A) the process was discovered by ace chemists. B) ace chemists discovered the process. C) ace chemists were responsible for discovering the process. D) discovery of this process was made by ace chemists."--

Answer:

thx for giving points and in reaturn i won't answer qustion because i don't know the answer thx for th points agian

Explanation:

The number of the molecules of water is 1.8 g is  6.02 * 10^22 molecules.

We can be able to obtain the molecules from the Avogadro's number. We know that the number of the molecules that we find in the compound can be gotten by the use of the proposition that was put forward by Avogadro.

Number of moles of the water = 1.8g/18 g/mol = 0.1 moles

We know that;

1 mole of water contains 6.02 * 10^23 molecules of water

0.1 moles of water would contain 0.1 mole * 6.02 * 10^23 molecules/ 1 mole

= 6.02 * 10^22 molecules

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\ \)

So we have

\(volume = \frac{220}{11} \\ \)

We have the final answer as

Hope this helps you

Answer:

1. A

2. B

3. D

4. C

Explanation:

Just trust me. Good luck on your test! (I go to K12 as well.)

Answer:

The density of the sample is 11.8 g/mL.

Explanation:

We are given an unknown sample with a mass of 23.5 g and a volume of 2.00 mL and we want to determine its density.

Recall that density is given by:

\(\displaystyle \rho = \frac{m}{V}\)

Where ρ is the density, m is the mass, and V is the volume.

Substitute 23.5 g for m and 2.00 mL for V and evaluate:

\(\displaystyle \begin{aligned} \rho & = \frac{m}{V} \\ \\ & = \frac{(23.5\text{ g})}{(2.00 \text{ mL})}\\ \\ & = 11.8 \text{ g/mL}\end{aligned}\)

Hence, the density of the sample is 11.8 g/mL.

Answer:

mass=23.5g

volume=2.88ml

Explanation:

But density= mass/volume

23.5/2.88

=8.15kgm^-3

Explanation:

Each sample has the same number of molecules.

simple

1 mole of oxygen have no. of molecules 1×6.022×10^23

and one mole of nitrogen have 1×6.62×10^23 molecules

Answer:

A is correct
hope it helps

Explanation:

Methanol, also known as wood alcohol, is used as a fuel and as a solvent. Ingestion of this alcohol can lead to blindness and death.

Methanol, or wood alcohol, is a colorless liquid that is commonly used as a fuel and as a solvent in various industrial processes. It has a high toxicity level, and ingestion of even a small amount can have severe health consequences.

One of the most dangerous effects of methanol ingestion is its potential to cause blindness. Methanol is metabolized in the body to formaldehyde and formic acid, both of which are highly toxic. These substances can cause damage to the optic nerve and result in permanent vision loss if not treated promptly.

Moreover, methanol poisoning can also lead to death. When ingested, methanol is rapidly absorbed into the bloodstream and distributed throughout the body. It affects multiple organ systems, including the central nervous system, liver, and kidneys. Severe cases of methanol poisoning can cause metabolic acidosis, seizures, coma, and respiratory failure, ultimately leading to death.

Due to its high toxicity, methanol is strictly regulated, and precautions should be taken to prevent accidental ingestion. It is important to handle methanol with care, using proper protective equipment and following safety guidelines.

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answer; the last two is me and u :

Answer:

The solubility mainly depends on the composition of solute and solvent (including their pH and the presence of other dissolved substances) as well as on temperature and pressure.

Explanation:

A proportional relationship means that the ratio of ingredients remains the same. Therefore, the sets of ingredients that are in a proportional relationship with the recipe are:

6 Tbsp oil, 1.5 Tbsp vinegar, 1 Tbsp honey (the ratio of oil:vinegar:honey is 2:0.5:0.33)

15 Tbsp oil, 4 Tbsp vinegar, 3 Tbsp honey (the ratio of oil:vinegar:honey is 12:3:2)

24 Tbsp oil, 6 Tbsp vinegar, 4 Tbsp honey (the ratio of oil:vinegar:honey is 12:3:2)

The other options are not in a proportional relationship with the recipe, as the ratio of ingredients does not remain the same.

Answer:

the iron is more condensed then the copper more electricity

Answer:

Subtance is a matter such as gold,copper, and oxygen.

Mixture is when you combine two different substances.

Answer:

In space ( the sun and it's atmospheres )

When titrating a strong acid with a strong base, after the equivalence point is reached, the pH will be determined exclusively by the excess amount of base added.

This is because the strong acid has been completely neutralized by the strong base at the equivalence point, and any further addition of the base will result in an excess amount of OH- ions in solution. These excess OH- ions will react with water to form more OH- ions, which will increase the pH of the solution. The amount of excess base added will determine the final pH of the solution after the equivalence point.

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There are basically three types of science investigation:

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The drink that would typically have the highest concentration of alcohol is hard liquor. Hard liquors are made through the process of distillation, which increases the alcohol content to a higher level.

Hard liquor is defined as liquor with an alcohol content of 30% or more, or 60 proof or higher. This means that they have a higher concentration of alcohol than beer, wine, or other drinks.Liquors are classified into different categories based on their alcohol content, which determines the intensity of their flavors and aromas. Some of the most popular types of hard liquor include whiskey, vodka, rum, gin, tequila, brandy, and cognac.

These liquors are usually consumed in small quantities, and they are often mixed with other ingredients to create cocktails. Their high alcohol content makes them perfect for people who want to drink alcohol without consuming large amounts of liquid.The alcohol content of hard liquor varies depending on the type of liquor and the brand. However, the average alcohol content for most hard liquors is between 35% and 45%. Some of the strongest hard liquors can have an alcohol content of up to 90%. Therefore, it is important to consume hard liquor in moderation to avoid harmful effects on the body.

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To calculate the mass of cobalt(II) acetate needed to prepare a 125 ml, 0.186 M aqueous solution, we first need to determine the molar mass of cobalt(II) acetate and then use the molarity and volume information.

Cobalt(II) acetate has the chemical formula Co(CH₃COO)₂. To calculate its molar mass, we add up the atomic masses of its constituent elements: cobalt (Co), carbon (C), hydrogen (H), and oxygen (O). The atomic masses are Co = 58.93 g/mol, C = 12.01 g/mol, H = 1.01 g/mol, and O = 16.00 g/mol.

Molar mass of Co(CH₃COO)₂ = (1 × Co) + (4 × C) + (6 × H) + (4 × O)

= (1 × 58.93) + (4 × 12.01) + (6 × 1.01) + (4 × 16.00)

= 58.93 + 48.04 + 6.06 + 14.00

= 177.0217 g/mol

Also, Cobalt (II) acetate exists in nature

Now, we can use the formula for molarity to calculate the mass of cobalt(II) acetate needed:

Molarity (M) = moles of solute/volume of solution (in liters)

Since we want to prepare a 0.186 M solution of 125 ml (0.125 L), we can rearrange the formula to solve for the moles of solute:

moles of solute = Molarity × volume of solution (in liters)

= 0.186 M × 0.125 L

= 0.02325 moles

Finally, we can calculate the mass of cobalt(II) acetate using its molar mass and the number of moles:

mass = moles × molar mass

= 0.02325 moles × 177.0217 g/mol

= 4.1157 grams

Therefore, approximately 4.1157 grams of cobalt(II) acetate should be added to the 125-ml volumetric flask to prepare a 125 ml, 0.186 M aqueous solution of the salt.

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Answer:

It would be this below.

Explanation:

I am not 100% sure this is write but I did my best this is still kinda hard for me. I just did this a few years ago and i struggled with it but I have been doing better since then.

Hope this helps :))

1) Groups of elements in the periodic table.

Metals are located in the middle and left side of the periodic table.

The second picture has correctly shaded the metals.

.

Answer:

The best soil for most plants to ensure optimum growth is a rich, sandy loam.

Answer:

Plasma can be found in lightning and stars.

Explanation:

Plasma is a state of matter that lacks a fixed volume and a fixed shape and consists of charged particles called ions. The sun and other stars consist of plasma. Plasma is also found naturally in lightning and the northern and southern lights.

The true statement is: Plasma can be found in lightning and stars and the correct option is option 1.

Plasma is the fourth state of matter, distinct from solid, liquid, and gas. It is an ionized gas consisting of a mixture of positively charged ions and free electrons. In this state, atoms have lost some of their electrons due to high temperatures or strong electromagnetic fields. This creates a highly conductive and energetic environment where particles move freely and interact with electromagnetic forces.

Plasma is commonly found in high-temperature environments like stars, lightning, and fluorescent light tubes. It also plays a crucial role in various industrial and technological applications, such as plasma TVs, fusion reactors, and certain medical treatments.

Thus, the ideal selection is option 1.

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A mole of one element contains same number of atoms as a mole of another element.

There are 6.022 × 10²³ atoms in one mole of an element, this is also called as Avogadro number,

Avogadro's number is number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.022 × 1023.

The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction,

Formulae to find Avogadro number:

∴ Number of moles = \(\frac{Number of particles}{Avogadro number}\) ,

(Number of moles = Number of particles divided by Avogadro number).

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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

\(n = \frac{4.3 \times {10}^{27} }{6.02 \times {10}^{23} } \\ = 7142.857...\)

We have the final answer as

Hope this helps you

Answer:

Helium (He), neon (Ne), and argon (Ar), as group 18 elements, have outer electron shells that are full or satisfy the octet rule. This makes them highly stable as single atoms. Because of their non-reactivity, they are called the inert gases or noble gases.

Explanation:

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