What is the percent mass of potassium chloride in a solution made by adding 25 g of potassium chloride to 70.0 ml of water?

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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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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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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Answer:

Surface weathering, I believe

Explanation:

The only product obtained from the ozonolysis of C10H18 with ozone and then with zinc and acetic acid is shown in the image attached.

The ozonolysis of alkenes is a reaction between an alkene and ozone which cleaves the alkene bond. The reaction proceeds through a molozonide and an ozonide intermediate which is highly unstable.

After the reaction of the alkene and ozone, zinc metal and acetic acid are used to reduce the ozonide to yield the product(s). The single product obtained by the ozonolysis of C10H18 is shown in the image attached.

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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:

Atomic no. of Fluorine =9

Atomic no. of Na=11

Therefore,

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

Therefore

,Element=Calcium

The molecular formula of the compound is N₂H₄

we'll begin by calculating the number of mole of the unknown gas. This can be obtained as follow:

Volume (V) = 200 mL = 200 / 1000 = 0.2 L

Pressure (P) = 1.81 atm

Temperature (T) = 25 °C = 25 + 273 = 298 K

Gas constant (R) = 0.0821 atm.L/Kmol

PV = nRT

1.81 × 0.2 = n × 0.0821 × 298

0.362 = n × 24.4658

Divide both side by 24.4658

[tex]n \: = \frac{0.362}{24.4658} [/tex]

mole of compound = 0.0148 mole

mass of compound = 0.473 g

[tex]molar \: mass \: = \frac{mass}{mole} \\ \\ molar \: mass \: = \frac{0.473}{0.0148} \\ \\ [/tex]

Nitrogen (N) = 0.414 g

Hydrogen (H) = 0.0591 g

Divide by their molar mass

N = 0.414 / 14 = 0.0296

H = 0.0591 / 1 = 0.0591

Divide by the smallest

N = 0.0296 / 0.0296 = 1

H = 0.0591 / 0.0296 = 2

Therefore, the empirical formula of the compound is NH₂

Molar mass of compound = 31.96 g/mol

Empirical formula = NH₂

Molecular formula = Empirical formula × n = Molar mass

[NH₂]n = 31.96

[14 + (2×1)]n = 31.96

16n = 31.96

Divide both side by 16

n = 31.96 / 16

n = 2

Molecular formula = [NH₂]n

Molecular formula = [NH₂]₂

Thus, the molecular formula of the compound is N₂H₄

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Answer:

The average kinetic energy decreases.

Answer:

The term allotrope refers to one or more physical forms of a chemical element that occurs in the same physical state. Allotropes may show differences in chemical and physical properties. Swedish chemist Jons Jakob Berzelius proposed the concept of allotropy in 1841.

explanation

i searched it ;)

Answer:

The law of conservation of mass states that mass is neither created nor destroyed but the mass of the system must remain constant over time. The total number of atoms in the reactants is equal to the total number of atoms in the product. Therefore, this chemical equation shows that energy is conserved and demonstrates the law of conservation of mass.

The given chemical equation, the total number of the magnesium, hydrogen, oxygen and nitrogen in the reactant is same in the product too.

Law of conservation of mass:

Mass is neither created nor destroyed but the mass of the system is always remain constant in the reaction.

The total number of atoms in the reactants must be equal to the total number of atoms in the product of a reaction.

For example-

[tex]\bold {Mg(OH)_2 + 2HNO_3 \rightarrow Mg(NO_3)_2 + 2H_2O}[/tex]

The total number of the magnesium, hydrogen, oxygen, and nitrogen in the reactant is same in the product too.

Therefore, the given chemical equation, the total number of the magnesium, hydrogen, oxygen and nitrogen in the reactant is same in the product too.

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Answer:

melting butter and frying eggs

Explanation:

Hope this helps please mark me brainliest

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)

Explanation:

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

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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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:

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]

Learn more:

Answer:

Diffusion

Explanation:

Answer:

2.65939942411 ( Round if needed)

Explanation:

The reason it is this is because, one mole of magnesium weighs 24.31 grams. So if you know that, then you would do 64.65 grams divided by 24.31 grams to get you a final amount of 2.65939942411 moles.

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

Answer:

0.420 g/ml

Explanation:

Question

An empty container with a volume of 140.0 cm3 is weighed and found to have a mass of 73.3 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.1 g. What is the density of the liquid to the appropriate number of  figures

density = mass/volume

d = (192.1 -73.3)/140.0 = 58.8/140.0 =0.420 g/ml

An empty container with a volume of 140.0 cm3 is weighed and found to have a mass of 73.3 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.1 g.0.420 g/ml is the density of the liquid.

The term density is defined as the mass of a substance per unit volume. density expressed in grams per cubic centimeter. The formula of density is as follows:

Density = mass/ volume

The density of something is a measure of how heavy it is in relation to its size. When an object is denser than water, it sinks; when an object is less dense than water, it floats. Density is a property of a substance that is independent of the amount of substance.

Given:

Volume = 140.0 cm³

Density = ?

mass = 73.3 g, 192.1 g.

density = mass/volume

density = (192.1 -73.3) / 140.0

= 58.8/140.0

=0.420 g/ml

Thus, The mass of the container and the liquid is 192.1 g.0.420 g/ml is the density of the liquid.

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Answer: A. a sample of liquid benzene at 80ºC and a sample of gaseous benzene at 80ºC

Explanation:

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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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

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:

2.12g/mol

Explanation: quick maths