Question is in picture

Answer:

magnesium and potassium are the group of ions

Explanation:

magnessium has positive charge and pottasium has negative charge

Answer:

D, They produce fossil fuels

Explanation:

you can't just pull them out of nowhere

Given what we know, we can confirm that the correct term to describe the change from a solid into a gas is sublimation.

Therefore, we can confirm that sublimation describes the process by which an element passes from a solid directly into a gas, without first becoming a liquid.

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Answer:

D. sublimation

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer:

B.

Explanation:

Answer:

i fond nothing sooory

pic so PC

Answer: 1250 miles

Explanation:

D=vt

1250 miles= 250mph(5hr)

Answer:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Explanation:

Answer:

Explanation:

Carbon dioxide is the answer I think.

Hope it helps...

Answer:

b

Explanation:

b because it's a physical change

Answer:

chlorophyll

Explanation:

Answer:

The length of the log is 180 cm

Explanation:

From the question given above, the following data were obtained:

Time = 2 hours

Speed = 1.5 cm/min

Distance =?

Next, we shall convert 2 hours to minutes. This can be obtained as follow:

1 h = 60 mins

Therefore,

2 h = 2 × 60

2 h = 120 mins

Finally, we shall determine the Lenght of the log. This can be obtained as follow:

Time = 120 mins

Speed = 1.5 cm/min

Distance =?

Speed = distance / time

15 = distance / 120

Cross multiply

Distance = 1.5 × 120

Distance = 180 cm

Therefore, the length of the log is 180 cm

Answer:

180

Explanation:

The temperature should be lowered to 300K to bring the volume to 300mL.

Temperature is the degree of hotness or coldness of a place or a body. The SI unit of temperature is Kelvin.

Volume is the amount of space occupied by matter. The SI unit of volume is cubic metre.

Using Charles law,

V1/V2 = T1/T2

Where, V1 and T1 are the initial volume and temperature

Similarly, V₂ and T₂ are the final volume and temperature.

Given:

V1 = 500mL

T1 = 300K

V2 = 300mL

T2 = ?

V1T2/V1 = V2T1/V1

          T2 = V2T1/V1

                = 300mL x 300K/500mL

           T2 = 180K

Hence, the temperature should be lowered to 300K to bring the volume to 300mL.

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Answer:

The large relative distances between particles in a gas means that there is considerable empty space between the particles.

The assumption that particles in a gas are relatively far apart explains gas compressibility.

Compressibility is a measure of how much the volume of matter decreases under pressure.

Energy is released by a gas when it is compressed

Explanation:

The kinetic molecular theory establishes that gases are composed of molecules. These molecules of gas are far apart from each other hence there is a considerable empty space between the gas molecules. As a result of these empty spaces between gas molecules, it is possible to compress a gas.

Compressibility is defined as a measure of how much the volume of matter decreases under pressure. When a gas is compressed, work is done on the gas and energy is evolved hence the gas heats up.

Answer:

1,2,5

Explanation:

I took it on usatesprep

Answer:

1/375

Explanation:

Primero se debe calcular el factor de dilución para cada dilución seriada. Para ello, se divide el volumen de muestra entre el volumen final de la solución diluida.

1) 1 mL  en 1 mL + 4 mL = 5 mL

D1 = 1 mL/5 mL = 1/5

2) 0,5 mL en 5 mL

D2 = 0,5 mL/5 mL = 1/10

3) 0,2 mL en 0,2 mL + 1,3 mL = 1,5 mL

D3 = 0,2 mL/1,5 mL = 2/15

La dilución total se calcula como el producto de las diluciones seriadas realizadas:

DT = D1 x D2 x D3 = 1/5 x 1/10 x 2/15 = 1/375

Answer:

2.8 g KOH

Explanation:

We can find the amount of moles we need by multiplying 0.500 L and the molarity given, 0.10 M (molarity is moles of solute divided by liters of solution). The liters cancel out, leaving us with moles; we can then take the moles and convert it to grams of KOH by using the molar mass of KOH.

0.500 L x 0.10 mol/1 L x 56.106 g /1 mol = 2.8 g KOH (two significant figures)

Answer: circle

Explanation:

Answer:In chemistry, a lone pair refers to a pair of valence electrons that are not shared with another atom in a covalent bond and is sometimes called an unshared pair or non-bonding pair. Lone pairs are found in the outermost electron shell of atoms. They can be identified by using a Lewis structure.

Answer:

[tex]P_2=2.6kPa[/tex]

Explanation:

Hello there!

In this case, according to the Gay-Lussac's gas law, which illustrates the pressure-temperature behavior as a directly proportional relationship:

[tex]\frac{P_2}{T_2}=\frac{P_1}{T_1}[/tex]

We can solve for the final pressure as shown below:

[tex]P_2=\frac{P_1T_2}{T_1}[/tex]

Thus, we plug in the initial pressure and temperature and final temperature to obtain:

[tex]P_2=\frac{6.58kPa*210K}{540K}\\\\ P_2=2.6kPa[/tex]

Which is not among the choices.

Regards!

Answer:

2 atoms

Explanation:

Sodium Chloride or NaCl is made up of two elements, sodium (or Na) and chlorine (or Cl). A molecule of sodium chloride, NaCl, consists of one atom each of sodium and chlorine. Hence, each molecule of NaCl has 2 atoms total.

2原子。塩化ナトリウムまたはNaClは、ナトリウム（またはNa）と塩素（またはCl）の2つの元素で構成されています。

There are approximately 3.01 x 10²² atoms in 5 grams of NaCl.

To calculate the number of atoms, we first need to convert the mass of NaCl into moles. The molar mass of NaCl is 58.44 g/mol, which is the sum of the atomic masses of sodium (22.99 g/mol) and chlorine (35.45 g/mol).

Using the formula:

moles = mass / molar mass

we can calculate the number of moles of NaCl in 5 grams:

moles = 5 g / 58.44 g/mol ≈ 0.0857 mol

Next, we need to use Avogadro's number, which is approximately 6.022 x 10²³ atoms/mol, to convert moles into atoms.

Number of atoms = moles x Avogadro's number

Number of atoms = 0.0857 mol x 6.022 x 10²³ atoms/mol ≈ 5.16 x 10²² atoms

Therefore, there are approximately 3.01 x 10²² atoms in 5 grams of NaCl.

It's important to note that this calculation assumes that all the NaCl is fully dissociated into its constituent atoms, which may not be the case in all situations.

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Answer:

3

Explanation:

1. The number of valence electrons the atom have is seven (7).

2. The atom is reactive

Valence electron is simply defined as the number of electron(s) present in the outermost shell of an atom.

Considering the diagram given from the question, the number of electrons in the outermost shell is seven (7).

Thus, we can conclude that the valence electron the atom have is seven (7)

From the diagram given, we determine that the number of valence electrons present is 7. This means that the atom required 1 more electron to complete its octet configuration.

Thus, the atom will be very reactive in order to quickly attain a stable configuration.

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Answer:

I think (B) is right answer because here oxygen is a combustible material and combustible is always take place when oxygen is burn

Answer:

1.2kg or 1200kg

Explanation:

F = ma

net force = 1,800

m = ??

a = 1.5m/s^2

m = F/a = 1,800/1.5 or 1,800 x 10/1.5 x 10

= 18,000/15 = 1,200kg or 1.2kg

Thanks