Can someone please help me ASAP

Answer:

is a mutiply choice answer just to be specific

Explanation:

Final answer:

Elements from the chalcogen group (group 16), which have six valence electrons, will combine with calcium in a 3:2 ratio to form a compound, such as calcium oxide ([tex]Ca_3O_2[/tex]).

Explanation:

The question asks which group of elements and how many valence electrons they have that would combine in a 3:2 ratio with calcium to form a compound. Calcium is an alkaline earth metal and has two valence electrons. It is located in group 2 of the periodic table. For elements to combine with calcium in a 3:2 ratio, we need to look for elements that will combine in such a way that three atoms of that element will bond with two atoms of calcium. This typically occurs with nonmetals from the chalcogen group (group 16), which have six valence electrons each.

For example, if we consider oxygen (O), which is a member of the chalcogen group, it can be seen that two calcium atoms (each providing two valence electrons for a total of four electrons) will combine with three oxygen atoms (each needing two electrons to complete its valence shell) to form calcium oxide ([tex]Ca_3O_2[/tex]) in a 3:2 ratio, utilizing all valence electrons involved in the bond formation.

Answer:

ye

Explanation:

help

Answer: 13.31 moles.

Explanation: So take 452 grams of Argon and multiply by the molar mass of Argon. Your units will cancel out, leaving you with moles of Argon.

Well, the big bang theory was that the universe started to expand at and extrmly fast rate. We're talking several billion kilometers in less than a second.  People think that our univers was pretty much shot out into space in a ciertain direction. During this, the univers has expanded and widen't to unimaginable size. but we really don't know what happend, and we may never find out. Who knows?

According to the traditional Big Bang theory, the universe's creation involved a singularity, a region of infinite density and temperature whose nature is difficult for humans to comprehend.

A physics theory called the Big Bang event explains how the cosmos grew from a highly dense and hot starting condition. The evolution of the observable universe from the earliest known times through its succeeding large-scale form is explained by several cosmological models of the Big Bang.

Everything in the cosmos was compressed into a singularity, a point of infinite heat and density, around 13.7 billion years ago. Our cosmos suddenly began to expand explosively, expanding faster than the speed of light.

Belgian Catholic priest, theoretical physicist, mathematician, astronomer, and professor of physics Georges Lemaître is credited with developing the theory itself. The notion was initially supported by Hubble's Law of the universe's expansion.

Thus, in the traditional Big Bang theory, the universe's creation involved a singularity.

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Answer:

0.674 mol

Explanation:

Step 1:

Data obtained from the question.

Volume (V) = 4 L

Pressure (P) = 560 kPa

Temperature (T) = 127°C

Number of mole (n) =?

Step 2:

Conversion to appropriate unit.

For pressure:

101.325 KPa = 1 atm

Therefore, 560 kPa = 560/101.325 = 5.53 atm

For temperature:

Temperature (Kelvin) = temperature (celsius) + 273

temperature (celsius) = 127°C

Temperature (Kelvin) = 127°C + 273 = 400K

Step 3:

Determination of the number of mole of Neon.

The number of mole of Neon can be obtained by using the ideal gas equation as follow:

Volume (V) = 4 L

Pressure (P) = 5.53 atm

Temperature (T) = 400K

Gas constant (R) = 0.082atm.L/Kmol

Number of mole (n) =?

PV = nRT

5.53 x 4 = n x 0.082 x 400

Divide both side by 0.082 x 400

n = (5.53 x 4) /(0.082 x 400)

n = 0.674 mol

The number of mole of Neon is 0.674 mol

To find the number of moles of Neon in 4.0 L of neon gas at 560 kPa and 127 °C, the ideal gas law is used, and approximately 0.674 moles of Neon are found.

The student has asked how many moles of Neon would be contained in 4.0 L of neon gas at 560 kPa and 127 °C. To answer this question, we will use the ideal gas law, which can be stated as PV = nRT where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin.

First, convert the temperature from Celsius to Kelvin:

Convert pressure from kPa to atm:

The ideal gas constant, R, is 0.0821 L·atm/mol·K.

Now, rearrange the ideal gas equation to solve for n (moles):

Plugging the values in, we get:

Therefore, there are approximately 0.674 moles of Neon in 4.0 L of neon gas under the given conditions.

Answer:

C. Stir the water continuously

Explanation:

stirring allows the solvent to continuously stick to the solvant

Lighting the candle on a double-pan mechanical balance will cause the balance to tilt as the candle loses mass due to combustion, favoring the side with the unburned weights.

When a candle placed on one pan of a double-pan mechanical balance is lit, and an equal weight is on the other pan, the balance will be disrupted over time. As the candle burns, it loses mass primarily through the combustion process, which converts wax into gases like carbon dioxide and water vapor that are released into the air. As a result, the mass in the candle's pan decreases, causing the balance to tilt favoring the side with the unburned weights, typically metal cylinders of standard mass.

Answer:

2052

Explanation:

multiply the pressure value by 760

To convert atm to torr, we should know 1 atm equals 760 torrs then the conversion exists 2052 torr.

Torr and atm are the two main pressure units. To convert atm to torr, we should know 1 atm equals 760 torrs.

It exists the manometric pressure unit. It exists described as, the pressure exerted by column of mercury one millimeter high it exists represented by mmHg.

Torr to mmHg conversion:

Both exists equivalent to each other.

1 torr = 1 mmHg

Torr to atm:

Torr exists converted into atm by dividing the torr value 760.

mmHg to atm.

mmHg exists converted into atm by dividing the torr value 760.

Kilopascal:

The kilopascal exists the unit of pressure. It exists denoted by KPa.

Given:

2.70 atm

The conversion exists given by,

1 atm = 760 torr

2.70 atm = 760 × 2.70 torr

= 2052 torr

Therefore, the correct answer is 2052 torr.

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Answer:

1 atom sulfur

Explanation:

1 molecule sulforous acid = SO2 Thus, 1 atom sulfur and 2 atoms O

If the temperature of a gas changes, but the number of moles and volume remain constant, Pressure also changed. Therefore, option B is correct.

The amount of force exerted per area is defined as pressure. To generate a large amount of pressure, you can use either a large force or a force applied over a small area.

Pressure is a situation that can have serious consequences if you don't perform well; thus, performing under pressure. It appears to be a life-or-death situation: your reputation, a relationship, your success, or your safety are all at stake. Your inability to distinguish between stress and pressure can be detrimental.

Pressure changes when the temperature of a gas changes but the number of moles and volume remain constant.

Thus, option B is correct.

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To determine the number of moles of glucosamine in a 1,000 mg dose, first calculate the molar mass of glucosamine (C6H13NO5), which is approximately 179.17 g/mol. Then convert the dose to grams (1,000 mg equals 1 g) and divide by the molar mass to find that the patient takes 0.00559 moles of glucosamine per day.

To calculate how many moles of glucosamine a patient takes each day when prescribed 1,000 mg of glucosamine, we need to first determine the molar mass of glucosamine. Glucosamine has a chemical formula of C6H13NO5, so we will sum the atomic masses of its constituent elements: Carbon (C), Hydrogen (H), Nitrogen (N), and Oxygen (O). The molar mass of one mole of glucosamine can be found by adding the molar masses of 6 carbons (≈13.01 g/mol), 13 hydrogens (≈1.01 g/mol), one nitrogen (≈14.01 g/mol), and five oxygens (≈16.00 g/mol), which equals approximately 179.17 g/mol. Next, we convert the prescribed dose from milligrams to grams: 1,000 mg = 1 g. Lastly, we divide the mass of glucosamine in grams by its molar mass in grams per mole to calculate the number of moles.

1 g / 179.17 g/mol = 0.00559 moles (or 5.59×10⁻³ moles), which is the amount of glucosamine the patient takes each day.

Answer: chemical reaction

Explanation:

Al3+(aq)+PO4^3-(aq)+3SO4^2-(aq0 --> 3AlPO4(s)+3Na+(aq)

Answer:

Iodine pentafluoride

Explanation:

Answer:

Iodine pentafluoride

Answer:atom

Explanation: electron cloud

Answer:

0.084 M

Explanation:

molar mass of Na3PO4 = 3*23 + 31 + 4*16 = 164 g/mol

moles of Na3PO4 = mass / molar mass = 0.46/164 = 0.0028 mol

There are 3 moles of Na+ in 1 mol of Na3PO4, so there are 3*0.0028 = 0.0084 moles of Na+ in the solution

Molarity is defined as:

M = moles of solute/litre of solution

100 ml are equivalent to 0.1 L

Therefore:

M of Na+ = 0.0084/0.1 = 0.084 M

Answer:

202 KPa

Explanation:

Step 1:

Data obtained from the question.

Initial Pressure (P1) = 220 kPa

Initial temperature (T1) = 26.7°C

Final temperature (T2) = 2.2°C

Final pressure (P2) =?

Step 2:

Conversion of the Celsius temperature to Kelvin temperature.

Temperature (Kelvin) = temperature (celsius) + 273

T1 = 26.7°C + 273 = 299.7 K

T2 = 2.2°C = 2.2°C + 273 = 275.2 K

Step 3:

Determination of the new pressure.

The new pressure of the tire can be obtained as follow:

P1/T1 = P2/T2

220/299.7 = P2/275.2

Cross multiply to express in linear form

299.7 x P2 = 220 x 275.2

Divide both side by 299.7

P2 = (220 x 275.2)/299.7

P2 = 202 KPa

Therefore, the new pressure of the tire is 202 KPa

When the temperature drops to 2.2 degrees Celsius, the tire pressure will decrease to approximately 202.1 kPa.

We can use the combined gas law which is derived from the ideal gas law. The combined gas law relates pressure, volume, and temperature without needing to know the quantity of gas, and is 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 do so, we first convert temperatures to Kelvin by adding 273.15. Then we rearrange the formula to solve for P₂:

Therefore, the tire pressure will decrease to approximately 202.1 kPa.

Answer:

B.) Metal Rusts.

Thank You ☺️ ☺️.

Answer :  The molality of solution is, 0.170 mole/kg

Explanation : Given,

Mass of dichlorobenzene = 0.25 g

Mass of cyclohexane = 10.0 g

Molar mass of dichlorobenzene = 147.01 g/mole

Formula used :

[tex]\text{Molality}=\frac{\text{Mass of dichlorobenzene}\times 1000}{\text{Molar mass of dichlorobenzene}\times \text{Mass of cyclohexane (in g)}}[/tex]

[tex]\text{Molality}=\frac{0.25g\times 1000}{147.01g/mole\times 10.0g}=0.170mole/kg[/tex]

Therefore, the molality of solution is, 0.170 mole/kg

Answer:

388.5

Explanation:

[tex] \frac{555}{32} = 17.34375 \\ 17.34375 \times 22.4 = 388.5 [/tex]

Answer B

Explanation:

A Physical change is a change in one or more physical properties of matter without any change in chemical properties. For example physical change include changes in the size shape of matter.

Answer:

Uhh..Because as you get farther away then you cant hear the sound waves i think

Explanation:

Answer:

because the sound waves can only travel so far and if there is things near the source the waves bounce off of it. Ex: the speaker in the class room wouldn't be quiet, its like the noise went away as i walked down the halls, maybe the walls were blocking the noise

Explanation:

Answer: 10L

Explanation:

Given that:

Initial pressure P1 = 1 atm

New pressure P2 = 3 atm

Initial volume V2 = 30 L

New volume V2 = ?

Since pressure and volume are involved, apply the formula for Boyle's law

P1V1 = P2V2

1 atm x 30L = 3 atm x V2

30 atm L = 3 atm x V2

V2 = (30 atm L / 3 atm)

V2 = 10L

Thus, volume changed to 10 liters

Answer:

The correct answer is 3.0 * 10^3 J.

Explanation:

To solve this problem, we must use the formula q = mcΔT, where q represents the heat energy measured in joules, m represents the mass measured in grams, c represents the specific heat measured in J/°C*g, and ΔT represents the change in temperature, measured in °C.

To solve this problem, we must first plug the given values into the equation.

q = mcΔT

q = (29.0 g)(4.184 J/°C*g)(25 °C)

Now, we must multiply the values together to get our final answer.

q = 3033.4 J

But, we must remember the rules of significant figures, which tell us that since the temperature only had 2 significant figures, the answer must have 2 significant figures as well.

Therefore, the answer is:

q = 3.0 * 10^3 J

Hope this helps!

Answer:

Relative humidity is low .

Explanation:

The wet bulb reads low temperature because due to low humidity of atmosphere , evaporation of water takes place from the wet bulb which makes the bulb cool and therefore it reads lower temperature . In the process of evaporation , heat equal to latent heat of vaporization is taken from the bulb and it loses temperature.

Answer:

3. Group

5. Valence electron

6. The atomic number tells you the presence of proton and electron.

Explanation:

The electrons which are present in the last shell or orbit is called valence electron and the shell is valance shell. When you go from left to the right side of the periodic table, number of shells remains the same but number of electron increases while when we go from top to bottom of periodic table, number of shell increases but the number of valance electrons remains the same.

Answer:

B

Explanation:

on edge

The second equation represents a fission reaction because a large atom splits into many smaller atoms along with  energy.

Fission reaction occurs when a larger atom split into two smaller atoms with the release of a tremendous amount of energy.

So we can conclude that the second equation represents a fission reaction because a large atom splits into many smaller atoms along with  energy.

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Answer:

0.016M

Explanation:

First we find the mole of AgNO3 by using the formula mass/molar mass..

Then we find molarity by the formula mole/volume...

I hope you get this..

Answer:

b. how atoms are arranged in it's molecules

I = Increase.

D = Decrease.

With the grass it'll decrease because more rabbits means more grass being eaten. With the animals the more rabbits there are the more food there is for them which means they more they can feed children and keep repopulating. And halving the rabbit population would be opposite I'd assume.