solveeeeee plzzzzzzzzz

Answer:

melting butter and frying eggs

Explanation:

Hope this helps please mark me brainliest

Answer:

The average kinetic energy decreases.

Answer: helium

Explanation: it’s in the very last column (group) and the first row (period)

Answer:

2.12g/mol

Explanation: quick maths

Answer:

Physical change is basically a change in where an object can easily return to its original state somehow as long as it’s possible but a chemical change is a change in which there is now simple way to change a substance back to original form. Basically (in simple words) chemical changes literally make something entirely new.

Explanation:

Physical changes come for example when you rip paper. You can easily fix it right up with some tape.

Chemical Changes is like rust on a bike or paper being burned. If that paper bein burned in flames you can’t put tape on the ashes and start writing on it like nuthin happend lol

Answer:

D

Explanation:

D because scientists study cells to know how to help people when they are sick

hope this helps (it might be wrong)

Answer:

D

Explanation:

i took the test and got it right :)

Answer:

law of multiple proportionsA law stating that if two elements form a compound, then the ratio of the mass of the second element and the mass of the first element will be small whole number ratios.

Explanation:

From the information provided in the question, the mass of NiCl2 required is 0.23 g.

NiCl2(aq) + 2AgNO3(aq) -------> 2AgCl(s) + Ni(NO3)2(aq)

Number of moles of AgCl= Mass/molar mass

Molar mass of AgCl= 143 g/mol

Substituting values;

Number of moles = 503 × 10^-3g/143 g/mol= 0.00352 moles

Since 1 mole NiCl2 precipitates 2 moles of AgCl

x moles of NiCl2 precipitates  0.00352 moles of AgCl

x = 1 mole ×  0.00352 moles/2 moles

x = 0.00176 moles of NiCl2

Mass of NiCl2= 0.00176 moles × 130 g/mol = 0.23 g

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Explanation:

The heart of the doorbell is an electromagnetic so yeah it does.

The water cycle is the endless process that connects all of that water. It joins the Earth's oceans, land, and atmosphere. The Earth's water cycle began about 3.8 billion years ago when rain fell on a cooling Earth, forming the oceans. ... Precipitation that falls onto land flows into rivers, streams, and lakes.

The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapor.

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The mass of N₂ in the mixture having a total pressure of 784 torr with an H₂ partial pressure of 124 torr is 1.988 g

We'll begin by calculating the partial pressure of N₂. This can be obtained as follow:

Total pressure = 784 torr

Partial pressure of H₂ = 124 torr

Total pressure = Partial pressure of H₂ + Partial pressure of N₂

784 = 124 + Partial pressure of N₂

Collect like terms

Partial pressure of N₂ = 784 – 124

Pressure of N₂ (P) = 660 Torr

Volume (V) = 2 L

Temperature (T) = 298 K

Gas constant (R) = 62.364 L.Torr/Kmol

PV = nRT

660 × 2 = n × 62.364 × 298

1320 = n × 18584.472

Divide both side by 18584.472

n = 1320 / 18584.472

Mole of N₂ = 0.071 mole

Molar mass of N₂ = 2 × 14 = 28 g/mol

Mass = mole × molar mass

Mass of N₂ = 0.071 × 28

Therefore, the mass of N₂ in the mixture having a total pressure of 784 torr with an H₂ partial pressure of 124 torr is 1.988 g

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Answer: K3PO4+3H2O.

Explanation:

H- 12

P- 3

O- 15

K- 3

(You need to multiply the subscript by the number in front of each compound, then add the number of each element in each of the compounds. Lmk is you need a better explanation)

The molar mass of X would be 63.55 g/mol and the chemical symbol of X would be Cu (copper).

From the equation of the reaction: F2+2XBr⟶Br2+2XF

The mole ratio of XBr to Br2 is 2:1

Mole of Br2 = mass/molar mass

                      = 0.7241/159.808

                       = 0.004531 mole

Mole of XBr = 2 x mole of Br2

                      = 2 x 0.004531

                        = 0.009062 mole

Molar mass of XBr = mass/mole

                            = 1.300/0.009062

                                 = 143.456 g/mol

Since the molar mass of Br is 79.904, the molar of X would be:

                             143.456 - 79.904

                                   = 63.55 g/mol

Hence, X would be Cu.

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Answer:

2 mol

Explanation:

NH4Br = NH4+ + Br-

1 mole of NH4+ and 1 mole of Br.

When a solution is diluted, the concentration of solution increases, as first statement is false, the correct option is A.

A liquid mixture in which the minor component i.e., the solute is uniformly distributed within the major component i.e., the solvent is referred to as a solution.

A dilute solution is one where a small portion of solute is dissolved in the solution. A concentrated solution contains a significant amount of solute.

Thus, the correct option is A.

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Answer:

it is the answer

Explanation:

Six hundred men, six hundred men under my command

With only one goal in mind

Make it back alive to our homeland

Six hundred men, six hundred miles of open sea

But the problem's not the distance

It's what lies in between

And Ithaca's waiting Ithaca's waiting

My kingdom is waiting The kingdom is waiting

Penelope's waiting for me

So full speed ahead, full speed ahead

because we are given the concentration of the hydroxide ion(OH⁻), we will first find the the concentration of [H⁺] ions and find the pH from there.

Finding the concentration of H⁺ ions:

we know the relation:

[OH⁻]*[H⁺] = 10⁻¹⁴                      [square brackets denote the concentration]

(10⁻⁴)[H⁺] = 10⁻¹⁴

[H⁺] = 10⁻¹⁰                                [multiplying both sides by 10⁴]

Finding the pH:

pH = -log[H⁺]

pH = -log(10⁻¹⁰)

pH = 10

Answer:

given:

abcissa(x-coordinate) of given point: -6

let's say the ordinate(y-coordinate) of the given point is y

distance of the given point from (1,3) = √74

we can rewrite the given information as:

the distance between the points (-6,y) and (1,3) is √74

finding y:

we know that in order to find the distance between any two points, we use the distance formula, which goes as

The volume of the balloon when the temperature is increased to 100 °C is 11.5 L

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

Initial volume (V₁) = 9 L

Initial temperature (T₁) = 20 °C = 20 + 273 = 293 K

Final temperature (T₂) = 100 °C = 100 + 273 = 373 K

Pressure = constant

The final volume of the balloon can be obtained by using the Charles' law equation as illustrated below:

V₁ / T₁ = V₂ / T₂

9 / 293 = V₂ / 373

Cross multiply

293 × V₂ = 9 × 373

293 × V₂ = 3357

Divide both side by 293

V₂ = 3357 / 293

Thus, the final volume of the balloon is 11.5 L

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There are 0.00045 moles of sodium hydroxide that were added in the solution.

From the question, we have the following information;

Volume of sodium hydroxide =  0.90 mL or 0.00009 L

Concentration of sodium hydroxide = 0.50 M

We  know that;

Number of moles = volume of solution × concentration of solution

Substituting values;

The number of moles of sodium hydroxide added = 0.9/1000 L ×  0.50

= 0.00045 moles

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Answer:

Atomic no. of Fluorine =9

Atomic no. of Na=11

Therefore,

Atomic no. of x element=9+11=20

Therefore

,Element=Calcium

Answer:

using the Charles law

v1/t1= v2/t2

Explanation:

1.19* 10^6/11+273=v2/113+273

1.19*10^6/284=v2/386

v2= 1.19*10^6/284/386

v2= 10.89L

Explanation:

Water has relatively strong hydrogen bonds holding the molecules together but CO² has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO² is a gas whereas H²O is a liquid at room temperature.

Answer: Water has relatively strong hydrogen bonds holding the molecules together but CO2 has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO2 is a gas whereas H2O is a liquid at room temperature.

Explanation: I hope it helps you!

Answer:

Surface weathering, I believe

Explanation:

This problem is describing the percent composition of a compound formed by chlorine and oxygen, whereas the former has a percent composition of 52.6 % and asks for the empirical formula.

In this case, according to the given information, it turns out firstly possible to realize, that the percent composition of oxygen will be 47.4 % as both must sum 100 %.

Next, for the determination of the empirical formula, we can assume this percents as masses, to calculate the moles of each atom in the formula:

[tex]n_{Cl}=52.6gCl*\frac{1molCl}{35.45gCl}=1.484molCl\\\\n_{O} =47.4gO*\frac{1molO}{16.0gO} =2.963molO[/tex]

After that, we divide the moles of both Cl and O by 1.484 (moles of Cl), in order to calculate the mole ratios which also provide the subscripts in the empirical formula:

[tex]Cl:\frac{1.484}{1.484}=1\\\\O:\frac{2.963}{1.484}=2[/tex]

Hence, the formula is:

[tex]ClO_2[/tex]

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Answer: the left group is the alkali metals while in the right side its the halogens... up to you to pick. either A or D

Explanation:

Answer:

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. ... This transforms the water into oxygen and the carbon dioxide into glucose. The plant then releases the oxygen back into the air, and stores energy within the glucose molecules.

Answer:

B

Explanation:

The resulting substance may have different chemical and physical properties than the elements that make it up.

The prediction can the student make about the new substances properties is the resulting substance may have different chemical and physical properties than the elements that make it up. Thus, option B is correct.

Physical and chemical changes are two different types of changes that can occur to matter. A physical change is a change in the form or appearance of a substance, but the chemical composition of the substance does not change. A chemical change is a change in the chemical composition of a substance, resulting in the formation of a new substance.

When wood burns, it reacts with oxygen in the air to form carbon dioxide and water vapor. The chemical composition of the wood changes, and a new substance is formed.

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