Which ionic compound is used as a building material?

salt
limestone
magnesium oxide
iron oxide

Answer: option C. 120°

Explanation:

Answer:

its b

Explanation:

The mass of the salt is 8.00 grams.

To find the mass of the salt, we need to know the molar mass of NaCl. The molar mass of NaCl is calculated by adding the atomic mass of sodium (Na) to the atomic mass of chlorine (Cl). The atomic masses of Na and Cl are 22.99 grams/mole and 35.45 grams/mole, respectively. Adding these two values, we get a molar mass of 58.44 grams/mole for NaCl.

Now, we can use the given number of molecules (8.24 x 10^22) to calculate the mass of the salt. To do this, we first need to convert the number of molecules to moles by dividing it by Avogadro's number (6.02 x 10^23 molecules/mole). So, the number of moles of NaCl is 8.24 x 10^22 / 6.02 x 10^23 = 0.1368 moles.

Finally, we can calculate the mass of the salt by multiplying the number of moles (0.1368) by the molar mass of NaCl (58.44 grams/mole). The mass of the salt is therefore 0.1368 moles x 58.44 grams/mole = 8.00 grams.

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Answer:

I think the answer is D a ray of violet light

Hope it helps!

The electron configuration for Boron (B) is given as [tex]1s^2 2s^2 2p^1[/tex] or [tex][He] 2s^2 2p^1[/tex]

Answer:

Boron (B) has an atomic number equal to 5 and is an element from Group 13 of the periodic table. It has a total of 5 electrons of which 3 are valence electrons.

The electron configuration for Boron can be written with the first two electrons in the 1s orbital. Since 1s orbital can hold only two electrons, out of the remaining three electrons; two electrons will go in the 2s orbital. The remaining one electron in the 2p orbital. Therefore the Boron electron configuration will be [tex]1s^2 2s^2 2p^1[/tex]

Since [tex]1s^2[/tex] is the electron configuration for Helium, Electron configuration for Boron can also be written as [tex][He] 2s^2 2p^1[/tex]

(Refer attached figure)

To calculate the density of the cube, we first determined the cube's volume by cubing the side's length and then divided the mass by the volume, resulting in a density of 6.179 g/cm³.

To find the density of the cube, we need to use the formula:

Density = mass/volume.

The mass of the cube is given as 0.92 grams. To calculate the volume of the cube, we cube the length of one side:

Volume = side3 = 0.53 cm x 0.53 cm x 0.53 cm.

Volume = 0.148877 cm3 (rounded to six decimal places).

Now, we can calculate the density:

Density = 0.92 g / 0.148877 cm3

Density = 6.179 g/cm3 (rounded to three decimal places).

Therefore, the density of the cube is 6.179 g/cm3.

Answer:

They’re correct it is 10 seconds

Explanation:

Answer: 10 seconds

Explanation:

Answer: 100kPa

Explanation:

P1 = 3.00 x 10² kPa , P2 =?

T1 = 30°C = 30 +273 = 303k

T2 = —172°C = —172 + 273 = 101k

P1/T1 = P2/T2

3 x 10² / 303 = P2 / 101

P2 = (3 x 10² / 303) x 101

P2 = 100kPa

Final answer:

The final pressure in the container when the temperature is lowered to -172°C is calculated using Gay-Lussac's Law. By converting temperatures to kelvin and applying the formula P2 = (P1 x T2) / T1, we find the final pressure to be approximately 99.5 kPa.

Explanation:

The question is related to the behavior of gases under changes in temperature, which can be described by the Gas Laws, specifically the Gay-Lussac's Law. According to Gay-Lussac's Law, the pressure of a gas is directly proportional to its temperature in kelvins, provided that the volume and amount of gas remain constant. The law can be expressed as P1/T1 = P2/T2, where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature.

To solve the problem, first convert the initial and final temperatures from Celsius to Kelvin:

Now using Gay-Lussac's Law:

The formula P2 = (P1 x T2) / T1 will give us the final pressure P2.

Substituting the known values:

P2 = (3.00 x 10² kPa x 101.15 K) / 303.15 K =approx 99.5 kPa

Therefore, the final pressure in the container will be approximately 99.5 kPa when the temperature is lowered to -172°C.

Answers:

a. Moles of oxygen formed: 0.670 mol

b. Moles of water formed: 1.34 mol

c. Mass of water formed: 24.1 g

d. Mass of oxygen formed: 21.4 g

Explanation:

Dihdyrogen dioxide is the chemical name for a compound made of two hydrogen atoms and two oxide atoms, i.e. H₂O₂, which is also known as hydrogen peroxide or oxygenated water.

The decomposition reaction of dihydrogen dioxide into water and oxygen gas is represented by the balanced chemical equation:

[tex]2H_2O_2(l)\rightarrow 2H_2O(l)+O_2(g)[/tex]

The mole ratios derived from that balanced chemical equation are:

a. Moles of oxygen formed

[tex]2\text{ mol }H_2O_2/1\text{ mol }O_2=1.34\text{ mol }H_2O_2/x[/tex]

When you solve for x, you get:

b. Moles of water formed

[tex]2\text{ mol }H_2O_2/2\text{ mol }H_2O=1.34\text{ mol }H_2O_2/x[/tex]

When you solve for x, you get:

c. Mass of water formed

Using the number of moles of water calculated in the part b., you calculate the mass of water formed, in grams, using the molar mass of water:

       ⇒ mass in grams = number of moles × molar mass

       ⇒ mass in grams = 1.34 mol × 18.015 g/mol = 24.1 g

d. Mass of oxygen formed

Using the number of moles of oxygen determined in the part a., you calculate the mass in grams using the molar mass of O₂.

Answer:

Yes

Explanation:

Sulfur in its pure do not have any taste and odor but many foods rich in sulfur can have a distinct odor and taste. The foods contains sulfur in very small amounts but some of the foods which are known for rich in sulfur are onion, garlic, egg, flex seeds, walnuts, meat, red bell pepper, cheese, green vegetables etc.

The foods rich in sulfur helps in fighting skin acne and fights skin infection which makes our skin brighter because of this property of sulfur it is used in skin antiseptic creme and medicines.

The intake of the excess sulfur can cause burning sensation, diarrhea, tonsils and even can cause brain damage if taken in too excess and death of the brain cells. So, the sulfur is good for health and is a remedy for our skin if taken by the natural source of food in a healthy amount.

Answer:

He is right, sulfured food dose taste different

Standard Molar Volume is the volume occupied by one mole of any gas at STP. Remember that "STP" is Standard Temperature and Pressure. Standard temperature is 0 &176:C or 273 K. Standard pressure is 1 atmosphere or 760 mm Hg (also called "torr"). 1 mole of any gas at STP occupies 22.4 liters of volume.

Answer: 4.5 L

Explanation: Ideal gas at STP standard temperature and pressure: at STP

P = 1 atm

T = 1 °C convert to K (273 K)

Solution:

PV= nRT

Derive the equation to find V

V= nRT / P

Substitute the values

V= 0.2 moles x 0.082 L.atm/ mol. K x 273 K / 1 atm

Cancel out the units of moles, atm and K so the remaining uni is in L.

Explanation:

Mutations on DNA create genetic variation and diversity on which natural selection acts upon. Mutation can be advantageous, disadvantageous or neutral. Those mutations that confer advantage are preserved in the population while those that are DISadvantageous are weeded out. This occurs because advantageous traits that give a particular advantage to individuals in the environment, however slightest, give them an increased chance of survival and passing their genes to subsequent generations.

An example is mutation that causes sickle cell-shaped blood cells. Individuals with sickle cell blood are less likely to contract malaria. Therefore in an environment where malaria is endemic, the population will have a higher allele frequency for sickle cell alleles that populations in non-endemic areas.

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Answer:

the answer to this question if dealing with biology should be;

Ww is an example of a Heterozygous allele

WW is an example of a Homozygous Dominant allele

ww is an example of a Homozygous recessive allele

Explanation:

this is due to the way scientists tend to write traits. this is the likely result of the box method of doing so

Ww is an example of a Heterozygous allele

WW is an example of a Homozygous Dominant allele

ww is an example of a Homozygous recessive allele

Explanation: This is due to the way scientists tend to write traits. this is the likely result of the box method.

Answer: 4.32g

Explanation:

MM of H2 = 1 x 2 = 2g/mol

2g of H2 contains 6.02x10^23 atoms.

Therefore Xg of H2 will contain 1.3 x 1024 atoms i.e

Xg of H2 = (2 x 1.3 x 1024) / 6.02x10^23 = 4.32g

Answer:

675 joule

Explanation:

mass of the branch=15 kg

gravity=9. 8 m/s^2

height=4. 5 m

now,

potential energy=mass×gravity×height

=15kg ×9. 8 m/s^2 ×4. 5 m

=675 j

Answer: PE = 662 J

Explanation: Potential Energy is the product of mass, gravity and height.

PE = mgh

= 15 kg x 9.8 m/s² x 4.5 m

= 662 J

Answer:

5.41 x 10²² g

Explanation:

Data Given:

no. of moles of sodium = 2.35 x 10²¹ moles

mass of sodium = ?

Solution:

Formula used

         no. of moles = mass in grams / molar mass

To find mass rearrange the above equation:

   mass in grams = no. of moles x molar mass. . . . . . (1)

Put values in equation 1

          mass in grams = 2.35 x 10²¹ moles x 23 g/mol

          mass in grams =  5.41 x 10²² g

So,

mass of Sodium (Na) =  5.41 x 10²² g

Answer:

1) mass ZnO = 55.155 g

2) V SO2(g) = 18.289 L

Explanation:

1) Zn + H2O  → ZnO + H2

∴ mass Zn = 41.6 g

∴ mm Zn = 65.38 g/mol

⇒ mol Zn = (41.6 g)(mol/61.38 g) = 0.678 mol Zn

⇒ mol ZnO = (0.678 mol Zn)(mol ZnO/mol Zn) = 0.678 mol ZnO

∴ mm ZnO = 81.38 g/mol

⇒ mass ZnO = (0.678 mol ZnO)(81.38 g/mol) = 55.155 g ZnO

2) S(s)  + O2(g)  →  SO2(g)

∴ mass S(s) = 24 g

∴ T = 25°C ≅ 298 K

∴ P = 1 atm

∴ mm S(s) = 32.065 g/mol

⇒ mol S(s) = (24 g)(mol/32.065 g) = 0.7485 mol S(s)

⇒ mol SO2(g) = (0.7485 mol S(s))(mol SO2(g)/mol S(s)) = 0.7485 mol SO2(g)

ideal gas:

⇒ V SO2(g) = ((0.082 atm.L/K.mol)(298 K)(0.7485 mol))/(1 atm)

⇒ V SO2(g) = 18.289 L SO2(g)

Answer:

21.4 ×10²³ particles

Explanation:

Given data:

Number of moles of aluminium sulfate = 3.55

Number of particles = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 3.55 moles of aluminium sulfate:

3.55 mol × 6.022×10²³ particles / 1 mol

21.4 ×10²³ particles

Answer:

the answer is A

Explanation:

The chemical formula is C₂H₅OH and the correct answer is C

A Chemical Formula is used to identify the constituent atoms / elements present in the sample and also the proportion in which the elements are mixed.

In the above figure given it can be seen that the colour of the molecules are being used to determine the Type of molecule

It can be easily observed that in the unknown molecule the carbon atom is connected to another carbon atom

The first Carbon atom is connected to 3 Hydrogen atom

and the second Carbon atom is connected to 2 Hydrogen and one Oxygen atom , The oxygen atom is connected to one Hydrogen atom.

So the chemical formula is C₂H₅OH and the correct answer is C

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Answer:

Round

Explanation:

Answer:

The pressure of the gas will  "increases by a factor of four."

Explanation:

The absolute zero in other words called as the absolute temperature. Whereas the absolute zero is the least possible temperature. In which nothing will remain cold and no heat can be released or present in the substance. When it is described in the figure it will be, –273.15 degrees Celsius on the Celsius scale. and  0 K on the Kelvin scale. This absolute temperature concept has been raised from the third law of the thermodynamics.

Answer: option D. 3:1

Explanation:

the answer to this question is C 2:1

Answer:

                   Radon is the heaviest Noble Gas

Explanation:

                    This statement is very easy to be solved. As we know that Noble Gases are group of Elements which have complete valence shell and are stable elements and don't react easily and hence, are found in mono-atomic form in nature. These elements can be found on the extreme right of the periodic table in group 8 or group 18. Following are the Noble elements,

                             (i) Helium

                             (ii) Neon

                             (iii) Argon

                             (iv) Xenon

                             (v) Radon

Now,

In statement we are provided with only two noble gases i.e. Helium and Radon. Therefore, it is easy among them to finalize the heaviest one as Radon having atomic mass of 222.02 g/mol and atomic radii of 0.22 nm is much denser/heavier than Helium having atomic mass of 4.0 g/mol and atomic radii of 0.122 nm.

Question: A 14.630 g milk chocolate bar is found to contain 9.315 g of sugar

How many milligrams of sugar does the milk chocolate bar contain

Answer:

"9315 mg" of sugar has the milk chocolate bar

Explanation:

Given that the  14.630 g milk chocolate has  9.315 g of sugar

We have to convert 9.315 grams to milligrams

We know that 1 gram  =  1000 mg

So

9.315 gram =  [tex]9.315 \times 1000[/tex]

9.315 gram =  9315 mg                          

Therefore, the milk chocolate bar has 9315 mg of sugar.

Answer:

C

Explanation:

Cheese is rotten milk

Answer:

The answer is C, Cheddar Cheese

Answer: the relative molecular mass of the compound

Explanation:

Answer:

The bucket with 50 degrees Celsius because it is more compact energy moving around faster in a smaller space, while the water in the bathtub is colder so it is moving slower but it also has more space so the protons don't bounce off of each other or the walls as much.

Explanation:

The bucket of water at 50°C would feel warmer to the touch. However, the bathtub filled with water at 25°C contains more energy due to its larger mass.

To determine which would feel warmer to the touch, we need to consider the temperature difference between the object and our body. The bucket of water at 50°C would feel warmer because it has a higher temperature compared to our body temperature. In terms of energy, the bathtub filled with water at 25°C contains more energy because it has a larger mass.

Heat energy is given by the formula Q = mcΔT, where Q represents heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Since the bathtub contains more water and has a larger mass than the bucket, it has more energy.

Therefore, while the bucket of water would feel warmer to the touch, the bathtub contains more energy due to its larger mass.

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The resonance structures of ozone differ only in the location of electrons in the structure.

The idea of resonance structures are invoked when a single structure does not sufficiently explain the bonding characteristics of a chemical species. The resonance structures show the different possible bonding extremes in the substance.

In the resonance structures of ozone, all the contributing structures only differ in the location of the electrons in the structure.

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Final answer:

The ozone molecule has resonance structures that differ by the location of electrons around the oxygen atoms, with the positions of the atoms remaining unchanged.

Explanation:

The resonance structures for ozone (O3) differ because they have electrons in different locations. Both structures have the same number of atoms and the same total number of electrons, which is 18. However, what changes between the resonance structures of ozone is the arrangement of these electrons around the oxygen atoms. The positions of the oxygen atoms remain unchanged. The use of double-headed arrows is common to illustrate that the two structures are resonance forms of the same molecule, indicating the shifting of electron locations without altering the atomic positions.

Answer: Protons = 13

Electrons= 10

Neutrons = 14

Explanation: This problem is an ion of Al which has a charge of +3

For this ion the atomic number for Al is 13 and its mass number is 27.

The atomic number indicates the number of protons which is 13. The number of electrons is changed due to loss of electrons since it was ionized. It loses 3 electrons so the total number of electrons is 13-3 = 10.

The number of neutrons can be calculated using

Atomic mass - atomic number

27- 13 = 14 neutrons

Aluminum ion (Al³⁺) has thirteen protons, thirteen protons, and ten electrons.

Aluminum ion (Al³⁺) is formed by the loss of three electrons from the neutral aluminum atom.

The neutral aluminum atom has thirteen protons, thirteen electrons, and thirteen protons.

During the formation of the Aluminum ion (Al³⁺), three electrons are removed from the valence shell of the neutral aluminum atom, leaving it with only ten electrons.

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Answer:

Homogeneous mixture

Solution

Liquid-gas

Hope this helps, hope its not late.

Answer:

Homogeneous mixture

Solution

Liquid-gas

Explanation: