What is the mass of a moon rock that occupies 250 mL and has a density of 1.02 g/mL?

Answer:

Explanation:

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

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

From the question

mass = 12 g

density = 19.30 g/mL

We have

\(volume = \frac{12}{19.30} \\ = 0.62176165...\)

We have the final answer as

Hope this helps you

Calcium ion created by the calcium atom losing two electrons has 18 electrons.

A neutral calcium atom has 20 electrons. When it loses two electrons, it becomes a calcium ion with a +2 charge. Since electrons have a negative charge, a calcium ion with a +2 charge will have 2 fewer electrons than a neutral calcium atom.

The calcium ion is a positively charged ion that has lost two electrons from the neutral calcium atom. It has a 2+ charge and is represented as Ca2+. The electronic configuration of the calcium ion is 1s² 2s² 2p⁶ 3s² 3p⁶, which means it has a total of 18 electrons. Thus, a calcium ion with a +2 charge will have 18 electrons.

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Answer: A, C, E

Explanation:

Got it right

Answer:

A, C, E

Explanation:

Thank the guy above me <3

The forward and reverse reactions are happening simultaneously, but the system is in a balanced condition since all of the material concentrations are constant. The majority of chemical processes that occur in the human body are governed by the equilibrium process.

The forward and reverse reactions are happening simultaneously, but the system is in a balanced condition since all of the material concentrations are constant. The majority of chemical processes that occur in the human body are governed by the equilibrium process.

Several instances of equilibrium include: a book that is open and at rest. a vehicle that is going steadily. a chemical process where both the forward and backward rates of reaction are equal.

Examples of equilibrium include a book that is at rest on a table. a vehicle that is going steadily. a chemical process where both the forward and backward rates of reaction are equal.

Le Chatelier's principle, commonly known as Chatelier's principle, is a chemical principle that is used to foretell how a change in circumstances will affect chemical equilibria.

The Le Chatelier principle explains how an equilibrium changes when its conditions change. For variations in concentrations, temperature, or pressure, the shift's direction can be predicted. Although catalysts speed up the process of reactions reaching equilibrium, they do not change the location of an equilibrium.

There was distilled water in the

Cuvette when the student placed standard Solution init.

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Answer:

Acid

Explanation:

When the pressure of a gas is tripled while keeping the temperature constant, the volume of the gas will decrease to one-third of its initial volume.

This is an example of Boyle's law, which states that the volume of a gas is inversely proportional to its pressure when the temperature is constant. This means that as pressure increases, volume decreases, and vice versa.Rubber rafts are often used in water activities as a means of transportation. They can easily be deflated, folded up, and stored in a compact space. Rubber rafts, on the other hand, are vulnerable to the sun's heat. If a rubber raft is left in the sun on a hot summer day, it can cause it to burst.

What happens is that the rubber expands when it is heated. As the temperature rises, the air molecules in the rubber become agitated and collide with each other, causing the rubber to expand. When this happens, the raft stretches and becomes weaker. If the temperature continues to rise, the pressure inside the raft increases as well. The pressure will eventually become too great, and the raft will burst.

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Answer:

i need this im struggling with my work

Explanation:

Last one and the first

The equilibrium constant gives the relation between the product formation and the reactant used. The concentration of the dinitrogen tetroxide is 0.003 M,  and nitrogen dioxide is 0.054 M.

An equilibrium constant gives the conversion rate of the reactant of the chemical reaction into the products.

The reaction can be shown as,

\(\rm N_{2}O_{4} \rightleftharpoons 2NO_{2}\;\; \rm Kp = 4.5\)

From the ICE table attached below, the concentrations are calculated as:

\(\begin{aligned}\rm Kp &= \rm \dfrac{[NO_{2}]^{2}}{N_{2}O{4}}\\\\4.5 &= \rm \dfrac {x^{2}}{(0.0550 - x)}\\\\\rm x^{2} &=\rm 4.5 (0.0550 - x)\end{aligned}\)

Solving further,

\(\begin{aligned} \rm 0.2475 - 4.5 x &= \rm x^{2}\\\\\rm x^{2} + 4.5 x - 0.2475 &= 0\\\\\rm x &= 0.054\end{aligned}\)

Therefore, the concentration of nitrogen dioxide is 0.054 M and dinitrogen tetroxide is 0.003 M.

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Answer:

B)

Explanation:

i would say physical weathering, nothing is changing chemically and nothing is being deposited, weathering is the process of deteriorating something

Answer:

escribe esa pregunta en una región de Latinoamérica

Kinetic energy is the energy possessed by an object due to its motion. If an object is moving, then it has kinetic energy. If an object has kinetic energy, then it is moving. Many students confuse kinetic energy with potential energy.

Answer:

A. all other bulbs will no longer work

Answer:

Elements are all the subtances on the periodic table. Compound are elements that are fused by chemical means like potassium chloride. Mixture are elements that are not chemically fused but just in a sense mixed together.

The specific rotation of the compound is -1022.5 degrees/(g·cm).

The specific rotation of a compound is a measure of its ability to rotate plane-polarized light. It is denoted by the symbol [α] and is expressed in degrees per unit concentration and unit path length. To calculate the specific rotation of the compound in this scenario, we need to use the formula:

[α] = observed rotation / (concentration (g/mL) × path length (dm))

In this case, the observed rotation is -4.09 degrees, the concentration is 10 g/500 mL (0.02 g/mL), and the path length is 20 cm (0.2 dm). Plugging these values into the formula:

[α] = -4.09 / (0.02 × 0.2) = -4.09 / 0.004 = -1022.5 degrees/(g·cm)

Therefore, the specific rotation of the compound is -1022.5 degrees/(g·cm).

It's important to note that specific rotation values are typically reported with the sign indicating the direction of rotation (clockwise or counterclockwise) and the units specified. In this case, the negative sign indicates that the compound rotates plane-polarized light in the counterclockwise direction.

It's also worth mentioning that the specific rotation is a characteristic property of a compound and can be used to identify and distinguish different enantiomers or optically active substances.

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Answer:

sure what is it . math or anything

Answer:

-182

Explanation:

according to the table it's the answer

According to forces of attraction and given data the substance with lowest melting point is that one with -182°C.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.Thus,the substance with lowest melting point is that one with -182°C.

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Noncovalent interactions between elements in the same molecule are known as intramolecular interactions.

Describe element noun.

I made the decision to walk in spite of the awful weather by braving the elements. New component required for the kettle. For the vast majority of home buyers, having a second source of income is crucial. They have all the qualities of a strong squad. Although she exaggerated, there was some truth to what she said.

Which words are equivalent to "element"?

element Units that are a portion of whole or entire substances, organizations, compounds, or combinations are referred to as elements, components, constituents, or ingredients. Element refers to a fundamental, essential component: the building blocks of matter; break the issue down into its component parts.

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ΔH for the process is -252.3 cal/mol or -1056 j/mol.

A solid salt compound dissociates in liquid water to form an aqueous solution of its constituent ions.

This is a chemical reaction, with the required heat change at constant pressure termed the enthalpy of solution.

If this value is positive, then the final prepared solution will have a lower temperature than the starting pure solvent.

Conversely, a negative enthalpy value results in a solution temperature that is higher than the starting solvent temperature.

It is given that

NaOH (s) → Na (aq) + OH (aq)

mass of NaOH is 16.9 g

mass of water = 70 g

ΔT = 86.6-22.4 °C = 64.2 °C

q = m × Cg × ΔT

q = amount of energy released or absorbed

m = mass

Cg = specific heat capacity

ΔT = change in temperature

n = m ÷ M

n = moles of solute

m = mass of solute

M = molar mass of solute

ΔHsoln = q ÷ n

ΔHsoln = molar enthalpy (heat) of solution

q = amount of energy (heat) released or absorbed

n = moles of solute

Cg= 1 cal/gm/°C

Now substituting the values in the equation

q = m × Cg × ΔT

q = 16.9 * 1 * 64.2

q = 1085 cal

n = m ÷ M

M= 70/18=3.9

n=16.9/3.9

n=4.3

ΔH = q ÷ n

ΔH =1085 /4.3

ΔH= -252.3 cal/mol or -1056 j/mol

Therefore ΔH for the process

NaOH(s) → Na(aq) + OH(aq)

is -252.3 cal/mol or -1056 j/mol

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we can conclude that the scale is precise but not accurate. The correct option is d.This means that the scale consistently gives the same measurements, but they are not accurate or close to the true value.

To understand whether the scale is precise, accurate, both, or neither, we need to define these terms. Precision refers to the consistency or reproducibility of measurements, while accuracy refers to how close the measured value is to the true or accepted value. In this case, the true value is 1.000g, and the measurements captured are 0.843 g, 0.842 g, and 0.843 g.Looking at these measurements, we can see that they are not accurate since none of them are close to 1.000g. However, we can also see that they are precise since they are all very similar to each other, with a difference of only 0.001g between the highest and lowest measurement.
Therefore, To improve accuracy, the scale may need to be recalibrated or replaced.

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complete question: Testing precision and accuracy of scale, weigh block exactly 1.000g. these are measurements captured:

a. 0.843 g

b. 0.842 g

c. 0.843 g

d. Is the scale precise, accurate, both, or neither?

Answer:

making drinks, purifying water

Explanation:

the acronym PASS involves  the steps needed for the operation of the fire extinguisher which are Pull, Aim, Squeeze, and Sweep.

P- Pull the pin, this step will allow you to discharge the extinguisher.

A- Aim the nozzle at the base of the fire, If aim at the flames, which is most frequently the temptation, the agent in the extinguisher will fly right through and will do no good,  You had to hit the fuel.

S- Squeeze the lever slowly, In this step depresses the button that releases the pressurized extinguishing agent in the extinguisher.

S- Sweep the spray from side to side over the fire,  Start using the extinguisher from a safe distance away, then move forward to the reduced flame, until the fire is completely out, but keep an eye,  on the area it may re-ignites.  

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Answer:

The mole allows scientists to calculate the number of elementary entities (usually atoms or molecules ) in a certain mass of a given substance. Avogadro's number is an absolute number: there are 6.022×1023 elementary entities in 1 mole. This can also be written as 6.022×1023 mol-1.

Explanation:

Chemical formulas show the number and type of atoms in the smallest representation of a substance.

In the field of chemistry, a chemical formula can be described as a representation of the different kinds of chemical elements that are present in a chemical reaction. The chemical formula also shows the number of atoms for each of the atoms that will be present in a chemical reaction or a chemical compound.

As chemical formulas only represent the types and no.of atoms, they are known to be the smallest representation that helps us to know what is present in a substance and what is the number of atom ratio of one element compared to another in that substance.

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Answer:

Explanation:d