Which of the following is NOT an example of a communicable disease.

The heat of vaporization of aluminium at 25 °C is 315.8 kilojoules per mole.

The sublimation is the phase change of a substance from solid to gas, the fusion is the phase change of a substance from solid to liquid and the vaporization is the phase change of a substance from liquid to gas. The heat of vaporization is the difference between the heat of sublimation and the heat of fusion, that is to say:

[tex]h_{v} = 326.4\,\frac{kJ}{mol}-10.6\,\frac{kJ}{mol}[/tex]

[tex]h_{v} = 315.8\,\frac{kJ}{mol}[/tex]

The heat of vaporization of aluminium at 25 °C is 315.8 kilojoules per mole.

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Answer:

V1/n1 = V2 /n2

0.236/0.306 = V2/ 4.40

V2 = 3.39 L

Answer:

0.0866 M

Explanation:

answer key

The molarity of the NaOH solution has been 0.0865 M.

The neutralization reaction of the Phosphoric acid and NaOH results in the formation of sodium phosphate and water.

The balanced chemical equation can be given as;

[tex]\rm H_3PO_4\;+\;3\;NaOH\;\rightarrow\;Na_3PO_4\;+\;3\;H_2O[/tex]

Thus for the neutralization of 1 mole of Phosphoric acid, 3 moles of NaOH has been used.

The moles of phosphoric acid in 0.100 grams sample:

Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]

Moles of phosphoric acid = [tex]\rm \dfrac{0.100}{99}[/tex]

Moles of phosphoric acid = 0.001 mol

For the neutralization of 0.001 moles of NaOH:

1-mole Phosphoric acid = 3 moles NaOH

0.001-mole Phosphoric acid =0.003 moles of NaOH.

The molarity of the NaOH solution:

Molarity = [tex]\rm \dfrac{moles}{Volume\;(L)}[/tex]

Molarity of NaOH = [tex]\rm \dfrac{0.003}{0.035}[/tex]

Molarity of NaOH = 0.0865 M

The molarity of the NaOH solution has been 0.0865 M.

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The mass of PbI2 produced from a trace amount of 630mL of 0.268M KI solution is 39.2 g.

The equation of the reaction is; 2KI(aq)+Pb(NO3)2(aq) → PbI2(s) + 2KNO3(aq)​

From the question, number of moles of KI = 630/1000 L × 0.268M = 0.169 moles

Now;

2 moles of KI is required to precipitate 1 mole of PbI2

0.169 moles of KI is required to precipitate 0.169 moles × 1 mole/2 moles

= 0.085 moles

Mass of PbI2 = Number of moles of PbI2 × Molar mass

Mass of PbI2 = 0.085 moles × 461.01 g/mol

Mass of PbI2 = 39.2 g

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Answer:

36 eggs

Explanation:

12 eggs in each carton

12 + 12 + 12 = 36 eggs

or 3 * 12 = 36 eggs

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Answer:

105m

Explanation:

u=20m/s

g=10m/s^2

t=3s

s=ut+1/2gt^2at

s=20*3+1/2*10*3*3

s=105m

Answer:

in physics we never work with minutes only seconds.

Heat required is mcΔT=100×0.39×50=1950 J

Solve any question of Thermodynamics with:-

The specific heat of the substance that requires 270 J of energy to raise the temperature is 2.57 J/g⁰C.

The specific heat capacity of the substance is calculated as follows;

Q = mcΔФ

where;

c = Q/mΔФ

c = (270) / (4.2 x 25)

c = 2.57 J/g⁰C

Thus, the specific heat of the substance that requires 270 J of energy to raise the temperature is 2.57 J/g⁰C.

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Ans

This is called oxidation

Explanation:

the oxidation number of a metal ion is more than the oxidation number of metal atom

Answer:

It is classified as a metal and is expected to be solid at room temperature.

Explanation:

not sure but i guess it is that

Answer:

verical rays

Explanation:

The rays result in shorter days are the vertical rays.

Vertical rays are another name for direct rays. Rays that are straight overhead are referred to as vertical. Because the Earth is spherical, not all the Sun's rays hit it directly or vertically.

Vertical rays lose less heat because they cover a shorter distance. Slanted rays cover more ground and dissipate more heat. Sun's vertical rays fall between the Tropics of Cancer and Capricorn, along its migratory belt.

The length of a day is determined by the Earth's rotation around its axis, which has been accelerating during the past several decades. Our days have been becoming shorter due to this tendency.

Thus, vertical rays are responsible for shorter days.

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Answer:

Birds can sit on power lines and not get electric shocks because the electricity is always looking for a way to get to the ground. The birds are not touching the ground or anything in contact with the ground, so the electricity will stay in the power line.

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Answer:

May I assume "ethanol acid is just ethanol (it has one slightly acidic H atom).  If so, the molar mass is 46.02 g/mole.

Explanation:

We have 30 cm^3 [30 ml] of 1.0 M (1 mole/liter)  [1 dm³ = 1 liter].

That is 1 mole/liter.  30 ml would contain (0.030 liter)*(1 mole/1 liter) = 0.03 moles.

Answer:

Hence, the wavelength of the photon associated is 1282 nm.

Explanation:

Answer:

(i)

A → CH3CH2CH3 ( Propane )

B → CH3CH(Cl)CH3 ( 2-Chloropropane )

C → No product

D→ CH3CH=CH2 ( 2-propene )

E → CH3CH2COOH ( Propanoic acid )

(ii)

Reagent X → Acidified water [ H+ / H2O ]

Reagent Y → Bromine with Carbon tetrachloride [ Br2 / CCl4 ]

Reagent Z → Sodium hydroxide [NaOH]

Answer:

5.23 moles

Explanation:

How many moles of iron are present in 3.15 × 10^24 atoms of iron?

1 mole has 6.02 X 10^23 particles

so

3.15X10^ 24 atoms =( 3.15 X 10^24)/(6.02 X 10^23) =(3.15/6.02 )X 10 =

5.23 moles

Considering the ideal gas law, a sample weighing 9.49 g occupies 68.67 L at 353 K and 2.00 atm.

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P× V = n× R× T

In this case, you know:

Replacing:

2 atm× V = 4.745 moles× 0.082[tex]\frac{atmL}{molK}[/tex]× 353 K

Solving:

V = (4.745 moles× 0.082[tex]\frac{atmL}{molK}[/tex]× 353 K)÷ 2 atm

V= 68.67 L

Finally, a sample weighing 9.49 g occupies 68.67 L at 353 K and 2.00 atm.

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Answer:

that is impossible. the atomic number can only go up each group

Answer:

Test answers

1. Water carving out a limestone cave

2. Oxidation

3. Acid rain

(Got 100%)

Explanation:

The primary agents of chemical weathering are water, oxygen and acids. So acid rain is an agent of chemical weathering. Option C is correct.

Water, and many chemical compounds found in water, is the main agent of chemical weathering.  One of the most abundant rock-forming minerals, chemically reacts with water and water-soluble compounds to form clay.

Water contains many weak acids such as carbonic acid. The primary agents of chemical weathering are water, oxygen and acids.

These react with surface rocks to form new minerals that are stable in, or in equilibrium with, the physical and chemical conditions present at the earth's surface.

Hence, option C is correct.

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Answer:

hiroghlipical

Explanation:

new word i just made

Answer:

Atomic number: 26

Atomic mass: 56

Net charge: +3

Explanation:

Answer:

its that DDDDDD

Explanation:

i know this because its that DDDDDDDD

The list which includes only bulk properties of matter is: C. boiling point, surface tension, vapor pressure.

What is matter?

Matter can be defined as anything that has mass and can occupy space.

Thus, any physical object or substance that is found on planet Earth is typically composed of matter.

The three (3) states of matter:

Since all matter are made up of atoms, they have a property of existing in three (3) distinct states and these include;

A bulk property of matter refers to the property that affects matter as a whole and they are listed as follows:

1. Stress

2. Strain

3. Elasticity

4. Boiling point

5. Surface tension

6. Vapor pressure

In conclusion, the other list of properties are not a bulk property of matter.

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Answer:

some example includes:

gold, copper, oxygen, chlorine, diamond

Explanation: