Select the statement that accurately summarizes how heat energy spreads throughout a substance. A) As a particle is heated, it absorbs energy. As it bumps into a nearby particle, it transfers all of the heat energy to the second particle. This leaves the first particle with no energy, so its movement slows.B) Heated particles absorb the energy and begin to move more and faster. As they move around, they bump into nearby particles and transfer some of their energy to those particles. This continues until all of the particles in the substance have the same amount of energy. C)Particles are heated and move around. They transfer thermal energy to the other particles as they bump into each other. This continues until all the particles lose all of their energy and motion stops. D)When particles are heated, they become sluggish and slow down. They transfer energy to nearby particles causing them to slow down, too.​

The moles of solute per liter of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grams per mole. 58.44 grams of sodium chloride dissolve in one liter of water to form a one molar solution, or 1M.

What is the molarity of a substance in which 10.8 grams per f calcium chloride is dissolved in enough water to make to make 125 mL of solution?

"2.7 moles"

Rearranging Molarity is determined by multiplying moles by litres.

Litres times molarity equals moles.

The amount of water in 125 g is similar to 125 ml, or 0.125 litre.

The number of moles is 0.125 x 2 = 0.25 mol since the molarity is 2.0M.

To get the answer of 10.8g, simply multiply this by the molar mass of calcium chloride, which is 110.98 g/mol.

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Answer:

197.5 grams

Explanation:

To find the mass (g) of the sample, you need to multiply the given volume (mL) by the denisty. You can use the denisty to convert between mL and g because the denisty is a ratio which represents the mass of the sample per every 1 mL. The ratio should be arranged in a way that allows for the cancellation of units (mL should be in the denominator).

Denisty = 7.9 grams/ 1 mL

   25 mL               7.9 grams
-----------------  x  ----------------------  =  197.5 grams
                                 1 mL

**The final answer is not written with the proper sig figs.

Scientific notation makes it easier to work with very large or very small numbers because it makes a very small or large number into a shorter one.

Scientific notation makes it easy to compare numbers that have very large values because all the zeroes have been replaced with small number which can be read easily. In scientific notation, numbers with a greater exponent are bigger than numbers with a small or less exponent because higher exponent shows the larger value and smaller value represents smaller value. So that's why scientific notation make easier to write or read a very large or small number.

So we can conclude that Scientific notation makes it easier to work with very large or very small numbers because it makes a very small or large number into a shorter one.

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The volume of foil for 14.45cm times 8.55 cm times 0.550 g is

67.95 cm^3

Volume = lenght * breadth * height

          = 14.45cm * 8.55 cm * 0.550 cm

          = 67.95 cm^3

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Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles

A mole is defined as 6.02214076 × 10²³ of some chemical unit, be it atoms, molecules, ions, or others.

Given:

volume=9.8 mL

Density= 0.960 g/mL

Percent concentration of solution= 25%

mass of nickel chloride=1.85 g

mass = density * volume

mass = 0.950 g/ml * 9.8 ml

mass = 9.31g

Since it is a 25 % solution of Ethylenediamine

mass of  ethylenediamine in 25 moles

moles of ethylenediamine = [tex]\frac{2.33g}{60g/mol}[/tex]  =0.0388 moles

Thus, Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles.

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Answer: D I PROMISE

Explanation:

IVE TOOK THE TEST AND ITS D

The statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.

The average atomic mass could be obtained as the sum of the products of the percentage abundance of each of the hydrogen isotopes and the mass of the isotope.

We know that every element has isotopes. In every sample of the atom, there are various isotopes of the element. Thus the average atomic mass must take into account the masses of all these isotopes.

As such, the statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.

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The energy of an orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 5.88 x 10⁻⁷ is 3.38 x 10⁻¹⁹ J.

Frequency is defined as the number occurrences of repeated events per unit of time. SI unit is hertz (Hz).

Using the formula,

                    E = hν

where,

E = energy in joules (J)

h = Planck's constant =  6.63 x 10⁻³⁴ Js

ν = frequency in hertz

Given :

frequency = 5.10 x 10¹⁴ Hz

h = 6.63 x 10⁻³⁴ Js

Putting the values,

E = (6.63 x 10⁻³⁴) x (5.10 x 10¹⁴) J

E = 3.38 x 10⁻¹⁹ J

Therefore, the energy of an orange lamp with a frequency of 5.10 x 10¹⁴ is  3.38 x 10⁻¹⁹J.

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The total volume of sample with given density and mass of copper is 16.815 cm³.

volume of copper = mass / density

v =  10.00g / 8.92g/cm³

v = 1.121 cm³

So to calculate total of volume of given sample,

Total volume = Volume of copper x Volume of water

V = 1.121 x 15.0

V = 16.815 cm³

A solid shape's capacity is measured using volume, a three-dimensional quantity. It implies that a closed figure's volume determines how much three-dimensional space it can occupy. A derived unit called the cubic meter (m3) serves as the SI unit of volume. The cubic decimeter is referred to as a "liter" (L) (dm3).

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Answer:

because the water is like a magnified glass Its on your hand and your hand apears bigger

Explanation:

The mole ratio of PbO2 to water is 1:2.

The mole ratio of PbO2 to water, PbO2:H2O, is 1:2 when the reaction stoichiometry is taken into consideration.

The appropriate reaction is:

2 PbSO4 + 2 H2O ⇒ Pb + PbO2 + 2 H2SO4

The following numbers of moles of each component are involved in the reaction according to reaction stoichiometry, which describes the relationship between the amounts of reagents and products in a chemical reaction:

1 mole Pb

1 mole of PbO2

H2SO4: 2 mol

2 moles of PbSO4

Water: 2 moles

Then, you can see that according to the reaction's stoichiometry, 1 mole of PbO2 produces 2 moles of water (H2O).

Therefore,the mole ratio of PbO2 to water is 1:2.

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The density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm is 1.11.

Density can be defined as the measurement of how tightly a material is pecked together. It is defined as mass per unit volume.

Its SI unit is g/cm3 .

Density can be expressed as

Density = mass/ volume  

Volume of metal block = length x width x height

                                      = 16.25 x 2.30 x 6.00

                                      = 224.3  ml

Density = 250.0 / 224.3 g/ml

             = 1.11 g/ml

Thus, the density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm is 1.11.

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N5+ + 2e →N³

here Nitrogen gains electron so, its reduction half-reaction

20²- → 0₂

here oxygen loss electron so, its oxidation half-reaction

20² → 20₂ + 4e¯​

here oxygen loss electron so, its oxidation half-reaction

2N5+ + 4e¯ → 2N³

here nitrogen gains electron so, its reduction half-reaction

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Mixing calcium carbonate and HCl

Heating copper sulfate pentahydrate

Mixing potassium iodide and lead nitrate

Combining magnesium and HCl

Burning the candle.

The crushing of limestone is a bodily trade it no longer alters the chemical composition of the limestone. The heating of limestone is a chemical trade the limestone decomposes into two other materials, lime and carbon dioxide. both ended in gas formation. both ended in shade change.

Rust is not anything however Iron Oxide is a brand new substance shaped out of the response. The color of the floor of the iron additionally modifications. hence, rusting of iron is a chemical trade. Rusting is an instance of chemical exchange. A chemical property describes the ability of a substance to go through a particular chemical alternate. The chemical belonging of iron is that it is miles capable of combining with oxygen to form iron oxide, the chemical call of rust. like several steel carbonates, calcium carbonate reacts with acidic solutions to supply carbon dioxide gas.

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The calculation gives the product 17000 to 2 significant figures

Significant figures in a calculation or a number refers to the number of non-zero numbers that are present in a number.

If the number contains a decimal point, the number of non-zero numbers before the decimal point gives the number of significant figures.

However, if a zero occurs between non-zero numbers, it is considered significant.

Significant figures are used in approximation to indicate to what point a set of numbers become significant.

In a calculation, the number significant figure is determined by the number which has the lowest number of significant figures.

In the given calculation, the lowest significant figure is in the numbers 3700 and 5.60

3700 × 20.1 × 5.60 × 0.0407 = 17000 to 2 significant figures

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Marjorie's unknown substance is sodium chloride NaCl.

The substance is insoluble in CCl₄. The density of the substance is 2.2 g/mL.

Solubility:

The fact that the chemical is insoluble in CCl₄ (tetrachloromethane), as indicated in the statement, indicates that the substance is polar in nature. Only C₁₀H₈ of the choices is soluble in CCl₄ since they are both non-polar by nature and related substances dissolve similarly. C₁₀H₈ is therefore disregarded.

Density:

There are now only three possibilities left. SiO₂, FeCl₃, and NaCl. The student discovered that the material has a density of 2.20 g/ ml. This is quite similar to sodium chloride's density (i.e., 2.165 g/mL). As a result, sodium chloride is most likely the material the student is working with.

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Answer:

A. Memory reconstruction

The answer is C. The toasting of the marshmallow is a chemical change.

Why?

Based on the other options:

A.) The melting of the chocolate ISNT a chemical change. It's a physical change.

B.) The digestion of food is NOT a physical change. It's a chemical change.

D.  The burning of the wood for the campfire is NOT a physical change. It's a chemical change.

Physical Change:  Doesn’t change the composition of the matter. However, its physical appearance and properties can change.

Chemical Change: During chemical changes, the matter that you start with isn’t the matter you end up with.

Answer: 1 g/ml

Explanation:

5 g / 5ml= 1 g/ml

E. The energy of an electron in the n = 15 energy state is determined as -9.6 x 10⁻²¹ J.

The energy of an electron in the n = 15 energy state is calculated as follows;

E = -13.6/n²

given n = 15

E = -(13.6/15²)

E = -0.06 eV

E = -0.06 x 1.6 x 10⁻¹⁹

E = -9.6 x 10⁻²¹ J

Thus, the energy of an electron in the n = 15 energy state is determined as -9.6 x 10⁻²¹ J.

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The theoretical yield of titanium tetrafluoride is 2.79 g

We know that the theoretical yield is the yield of the product that we can obtain from the stoichiometry of the problem. We now have to go back to the reaction equation and write;

[tex]Ti(s) + 2F_{2} (g) --- > TiF_{4} (s)[/tex]

Number of Ti = 2.5g/48 g/mol = 0.052 moles

Number of moles of F2 =  1.7 g/38 g/mol  0.045 moles

If 1 mole of Ti reacts with 2 moles of F2

0.052 moles reacts with 0.052 moles * 2 moles/1 mole

= 0.10 moles

We can see that F2 is the limiting reactant

If 2 moles of F2 1 mole of [tex]TiF_{4}[/tex]

0.045 moles of F2 produces 0.045 moles * 1 mole/2 moles

=  0.0225 moles

Mass of titanium tetrafluoride = 0.0225 moles * 124 g/mol

= 2.79 g

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The kinetic energy of electrons emitted from chromium surface is determined as  2.9  x 10⁻¹⁹ J.

The energy of the emitted photon is calculated as follows;

E = hf

E = hc/λ

where;

E = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (200 x 10⁻⁹)

E = 9.94 x 10⁻¹⁹ J

Φ = 4.4 x 1.6 x 10⁻¹⁹

Φ = 7.04 x 10⁻¹⁹ J

E = K.E + Φ

K.E = E - Φ

K.E = 9.94 x 10⁻¹⁹ J - 7.04 x 10⁻¹⁹ J

K.E = 2.9  x 10⁻¹⁹ J

Thus, the kinetic energy of electrons emitted from chromium surface is determined as  2.9  x 10⁻¹⁹ J.

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Answer:

they're

Explanation:

solid, liquid and gas

Hexane is an alkane with six carbon atoms.

Hexane is an organic substance having the chemical formula C6H14. It is a straight-chain alkane containing six carbon atoms. When pure, it is an odorless, colourless liquid with a boiling point of roughly 69 °C (156 °F). It is a broadly applicable non-polar solvent that is quite safe, mainly unreactive, affordable, and easily evaporable.

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Answer:

Divide the time value by 1000

Explanation:

7 Ms = 0.007s

Answer: C & D

Explaination:

C because the atomic number increases sequentially and also the nuclear charge

D because as you're moving down a column the valance electrons does not change, only the atomic radius does.

Answer:

um 27 yards..............