How many formula units are in 9.8 grams of calcium hydroxide?

Depending on the molecule's chemical composition, they can be purines or pyrimidines.

Nucleotide building blocks are the monomers (single molecules) that make up nucleic acids, such as deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). They are classified as either purines or pyrimidines, depending on the chemical structure of the molecule.

Purines: Adenine (A), Guanine (G)

Pyrimidines: Cytosine (C), Thymine (T), Uracil (U)

Sorted by name: Adenine (A), Cytosine (C), Guanine (G), Thymine (T), Uracil (U)

Sorted by classification: Purines: Adenine (A), Guanine (G) Pyrimidines: Cytosine (C), Thymine (T), Uracil (U).A nucleotide is the basic structural unit of nucleic acids such as DNA and RNA.

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complete question:sort these nucleotide building blocks by their name or classification. from below image

Answer:

The extract is boiled with FeSO4 and acidified with concentrated H2SO4. The appearance on Prussian blue colour indicates the presence of nitrogen

Explanation:

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Answer:

d- 7.58 L

Explanation:

According to Charles's law, the temperature in Kelvin is proportional to the volume of a dry gas when the pressure is constant.

Mathematically, V1/T1 = V2/ T2

V1= initial volume= 6.6 L

T1= Initial temperature= 115 °C= (115 °C +273)=388K

V2= final volume

T2= final temperature= 173 °C= ( 173 °C+ 273)= 446K

Substitute the values,

V2=( V1 × T2)/ T1

= (6.6×446)/388

= 2943.6/388

= 7.6L

Answer:

Tectonic Plates

Explanation:

Answer:

Tectonic plates

Explanation:

Explanation:

Plasma is an ionized gas, a distinct fourth state of matter. “Ionized” means that at least one electron is not bound to an atom or molecule, converting the atoms or molecules into positively charged ions.but plasma is present in human body too in a liquid form.

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Answer:

Brightness. Two characteristics define brightness: luminosity and magnitude. ...

Color. A star's color depends on its surface temperature. ...

Surface Temperature. ...

Size. ...

Mass.

Explanation:

there

Answer:

If you must use a fire extinguisher, remember to never use a co2 based extinguisher on a person. A Co2 fire extinguisher works by covering the target with a layer of carbon dioxide gas, which can cause frostbite, mild to extreme respiratory problems, and suffocation or death in some instances.

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Using a CO₂ based fire extinguisher on a person can be dangerous and should be avoided.  While CO₂ extinguishers are effective for certain types of fires, they are not designed for extinguishing fires involving flammable liquids or solids.

Few reasons why CO₂ -based fire extinguishers should not be used on a person:

Displacement of Oxygen: CO₂ extinguishers function by displacing oxygen, which is required for burning. The produced CO₂ can displace oxygen in the surrounding air when used in a confined environment or directly on a person, potentially leaving the user without enough oxygen to breathe.

Very Cold Temperature: When compressed CO₂ is discharged, it expands upon discharge and cools to an incredibly low temperature. Direct CO₂ from a fire extinguisher contact can result in frostbite or cold burns on the skin, which might lead to tissue damage.

High Pressure: In order to efficiently eject the gas, CO₂ fire extinguishers work at high pressure. Directly targeted at a person, the force of the discharge may result in bodily damage including bruising or eye injuries.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Sometimes, the best thing to do in the event of a crude oil spill is to do nothing, particularly if the spill is in a remote location with limited human or wildlife exposure.

This is because any attempt to clean up the spill could potentially do more harm than good, such as disrupting fragile ecosystems or causing further damage to the environment. In these cases, it is often recommended to simply monitor the spill and let nature take its course in breaking down and absorbing the oil. However, if the spill poses a significant threat to human health or the environment, action must be taken to contain and mitigate the spill.

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There are approximately 0.05239 grams of KF in 45.0 mL of 0.200 M KF. 58.3 mL of 3.00 M HCl needs to be added to a 500 mL volumetric flask and then filled with water to the mark to prepare a 0.350 M HCl solution.

To calculate the number of grams of KF in 45.0 mL of 0.200 M KF, we need to use the formula:

grams = (volume in liters) x (molarity) x (molar mass)

Converting the given volume to liters we get,

45.0 mL = 45.0/1000 = 0.045 L

grams = 0.045 L x 0.200 mol/L x (molar mass of KF)

molar mass of K = 39.10 g/mol

molar mass of F = 18.99 g/mol

molar mass of KF = 39.10 g/mol + 18.99 g/mol = 58.09 g/mol

grams = 0.045 L x 0.200 mol/L x 58.09 g/mol

grams = 0.05239 g

Therefore, there are approximately 0.05239 grams of KF in 45.0 mL of 0.200 M KF.

The equation we can use is:

(M₁)(V₁) = (M₂)(V₂)

M₁ = 3.00 M (concentration of the concentrated HCl)

V1 = unknown (volume of the concentrated HCl needed)

M₂ = 0.350 M (desired concentration of the diluted HCl)

V₂ = 500 mL = 0.500 L (desired total volume of the diluted HCl solution)

Substituting the values into the equation, we get:

(3.00 M)(V1) = (0.350 M)(0.500 L)

V₁ = (0.350 M)(0.500 L) / 3.00 M

V₁ = 0.0583 L = 58.3 mL

Therefore, approximately 58.3 mL of 3.00 M HCl needs to be added to a 500 mL volumetric flask and then filled with water to the mark to prepare a 0.350 M HCl solution.

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Answer:

true I just guessed of I'm being honest

The properties of compounds depend on their structure.

When 2 or more atoms link up, they create a molecule. And we can say that a collection of molecules is called a compound.

Matter on Earth is in the form of solid, liquid, or gas. Solids, liquids, and gases are made of tiny particles called atoms and molecules.

Answer: B. Matter

Answer:

Explanation:

Here, we want to know what happens to a solution that becomes more acidic

A lesser ph (1-7) indicates acidity with the acidity being higher as the number becomes smaller

What this means is that a solution with a pH of 3 is more acidic than a solution with a pH of 5

Thus, when the acidity increases, it is expected that the pH of the solution decreases (it becomes smaller in number)

The sum of 3(3)/(8) and 6(1)/(2) is 5(5)/(8), which is a mixed number representing 5 whole units and 5/8 of another unit.

To find the sum of mixed numbers, we need to add the whole numbers and the fractions separately. Add the whole numbers: 3 + 6 = 9

Add the fractions: For the fractions 3/(8) and 1/(2), we need to find a common denominator. The least common multiple of 8 and 2 is 8.

Converting 3/(8) to have a denominator of 8:

3/(8) = (3 x 1)/(8 x 1) = 3/(8)

Converting 1/(2) to have a denominator of 8:

1/(2) = (1 x 4)/(2 x 4) = 4/(8)

Now, we can add the fractions:

3/(8) + 4/(8) = (3 + 4)/(8) = 7/(8)

Combine the whole numbers and fractions:

The whole numbers sum was 9 and the fractions sum was 7/(8). We can write this as a mixed number by dividing the numerator (7) by the denominator (8). The quotient is 0 with a remainder of 7. Therefore, the mixed number is 0(7)/(8), which can be simplified to 7/(8).

Therefore, sum of 3(3)/(8) and 6(1)/(2) is 5(5)/(8).

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The amount of aluminum that reacted is approximately 0.069 grams.

To determine the mass of aluminum that reacted, we need to use the ideal gas law and consider the partial pressure of hydrogen gas. First, we calculate the pressure of hydrogen gas by subtracting the partial pressure of water vapor from the total pressure. The pressure of hydrogen gas is 751 mmHg - 26.8 mmHg = 724.2 mmHg.

Next, we convert the pressure of hydrogen gas from mmHg to atm by dividing by 760 mmHg/atm, giving us 0.953 atm.

Using the ideal gas law equation PV = nRT, we can calculate the number of moles of hydrogen gas. The volume of hydrogen gas is given as 37.3 mL, which we convert to liters by dividing by 1000 mL/L, giving us 0.0373 L. The temperature is given as 27°C, which we convert to Kelvin by adding 273.15, giving us 300.15 K. The ideal gas constant R is 0.0821 L∙atm/(mol∙K).

Plugging the values into the ideal gas law equation, we can solve for the number of moles of hydrogen gas: (0.953 atm) * (0.0373 L) = n * (0.0821 L∙atm/(mol∙K)) * (300.15 K).

Simplifying the equation, we find that the number of moles of hydrogen gas is approximately 0.00139 moles.

Since the balanced chemical equation between aluminum and hydrochloric acid is 2Al + 6HCl → 2AlCl₃ + 3H₂, we can conclude that 2 moles of aluminum react to produce 3 moles of hydrogen gas.

Using this ratio, we can calculate the number of moles of aluminum that reacted: (0.00139 mol H₂) * (2 mol Al / 3 mol H₂) = 0.000926 moles Al.

Finally, we can convert moles of aluminum to grams using the molar mass of aluminum (26.98 g/mol): (0.000926 mol Al) * (26.98 g/mol) ≈ 0.069 g Al.

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Answer:

They landed a Rover!

Explanation:

Isn't that Awesome!?!

When a runner with a prosthetic leg takes a step with the other leg it springs back turning some of the potential energy into kinetic energy. The correct option is potential energy into kinetic energy.

Potential energy is the stored energy that an object possesses due to its position or condition. An object may gain or lose potential energy as a result of changes in its position or condition. The potential energy can be gravitational potential energy, elastic potential energy, electric potential energy, magnetic potential energy, chemical potential energy, nuclear potential energy, etc.

Kinetic energy is the energy that an object possesses as a result of its motion. A moving object has the ability to perform work because of its kinetic energy. The amount of kinetic energy an object has is dependent on its mass and velocity. Kinetic energy is given by the formula KE = 0.5mv2 where m is the mass of the object and v is its velocity.

When a runner with a prosthetic leg takes a step with the other leg, it springs back and turns some of the potential energy into kinetic energy. This is because the energy that was stored in the prosthetic leg due to its deformation gets released when it springs back. This results in a sudden increase in kinetic energy, which is then used by the runner to propel themselves forward.

Hence, the correct option is potential energy into kinetic energy.

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Answer:

\(\large \boxed{1.615 \times 10^{25}\text{ molecules water}}\)

Explanation:

You must calculate the mass of the water, convert it to moles, and then calculate the number of molecules.

1. Mass of water

\(\text{Mass } = \text{499.8 mL} \times \dfrac{\text{0.967 g}}{\text{1 mL}} = \text{483.3 g}\)

2. Moles of water

\(\text{Moles of water} = \text{483.3 g water} \times \dfrac{\text{1 mol water}}{\text{18.02 g water}} = \text{26.82 mol water}\)

3. Molecules of water

\(\text{No. of molecules} = \text{26.82 mol water} \times \dfrac{6.022 \times 10^{23}\text{ molecules water}}{\text{1 mol water}}\\\\= \mathbf{1.615 \times 10^{25}}\textbf{ molecules water}\\\text{The sample contains $\large \boxed{\mathbf{1.615 \times 10^{25}}\textbf{ molecules water}}$}\)

The number of molecules of water  present in the bottle is 1.62×10²⁵ molecules.

We'll begin by calculating the mass of the water in the bottle.

Mass = Density × Volume

Mass of water = 0.967 × 499.8

Mass of water = 483.3066 g

Finally, we shall determine number of molecules of water in the bottle.

From Avogadro's hypothesis,

1 mole of water = 6.02×10²³ molecules

But,

1 mole of water = 18 g

Thus, we can say that:

18 g of water = 6.02×10²³ molecules

Therefore,

483.3066 g of water = (483.3066 × 6.02×10²³) / 18

483.3066 g of water = 1.62×10²⁵ molecules

Thus, the number of molecules of water in the bottle is 1.62×10²⁵ molecules.

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Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.

Answer:

A

Explanation:

energy stored in chemical bonds of molecules

Answer:

the density of an object determines whether it will sink or float

Answer:

Its B,C,E

Explanation:

Answer:

50 mL; 7

Explanation:

By looking at the graph, the boundary point where the solution turns from acidic to basic appears at approximately 50 mL.

Because this is a titration between a strong acid and strong base, the pH of the equivalence point is always 7 (aka neutral).  

Answer:

The element with the lower group number is written first in the name; the element with the higher group number is written second in the name. Exception: when the compound contains oxygen and a halogen, the name of the halogen is the first word in the name.

Explanation:

Source: https://www.chem.purdue.edu/gchelp/nomenclature/covalent.htm#:~:text=Rule%201.,first%20word%20in%20the%20name.

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In a covalent compound, the element that is named first is typically the one that is the least electronegative.

Electronegativity is a measure of an atom's ability to attract electrons to itself. The element with the lowest electronegativity will be named first in a covalent compound.

For example, in the compound H₂O (water), hydrogen is the least electronegative element, so it is named first. In the compound CO₂ (carbon dioxide), carbon is the least electronegative element, so it is named first.

It is important to note that there are some exceptions to this rule, such as when the compound contains a metal and a nonmetal. In these cases, the metal is always named first, regardless of its electronegativity.

Overall, the order in which elements are named in a covalent compound is determined by their relative electronegativities, with the least electronegative element being named first.

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The calorimeter constant when 51.203g of water at 55.2c is added to a calorimeter containing 49.783g of water at 23.5c and for the system to equilibrate, the final temperature reached is 37.6c is  9.67J/gc.

Given mass of water (m1) = 51.203g

Temperature of water (T1) = 55.2c

mass of water (m2) = 49.783g

Temperature of water (T2) = 37.6c

the final temperature reached is = 37.6c

We know that specific heat (Q) = mCpΔT where m is mass Cp is latent heat and ΔT is change in temperature.

So Qwater = 51.203 x 4.184 x (23.5 - 55.2) = 6791.9J

Qcalo = 49.783 x Cp x (23.5 - 37.6) = 701.9 x Cp

Given that Qwater = Qcalo

6791.9J = 701.9 x Cp

Cp = 9.67J/gc

Hence the calorimeter constant is  9.67J/gc

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Answer:

the direction of the object

Explanation:

Answer: Its not popping up for me *-*?