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3 years ago

Match each object to its description:

Chemistry

2 answers:

kramer3 years ago

6 0

Answer:

A. Coma of a comet -Haze surrounding a nucleus

B. Comet tail -Created by solar wind.

C. Oort cloud -Hypothetical sphere around the solar system

Explanation:

A comet is formed of rock, dust and frozen gases. It is sometimes referred as dirty snow ball. Comets are generally found in Kuiper belt and Oort cloud. These lie in the outskirts of the solar system. Oort cloud is a Hypothetical sphere which surrounds the solar system. It has extremely low temperature.

A comet is three parts:

Nucleus- It is core of the the comet. It is made of rocks and dust and frozen gases.

Coma - it is the atmosphere of the comet. It is composed of sublimated gases when comet enters the solar system. coma is held by gravity around the nucleus. It appears like a Haze around the core.

Comet Tail - When comet nears the Sun, the coma expands and extends backwards due to solar wind. It is composed of dust and gases. The tail of a comet can extend millions of kilometers and can be observed using a telescope form the the Earth.

NikAS [45]3 years ago

4 0

A)→ Haze surrounding a nucleus
B)→ Created by solar wind.
C)→ Hypothetical sphere around the solar system

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When a teacher dilutes 50 mL of 2.0 M NaOH to 0.50 M, what volume of NaOH results?

JulijaS [17]

Answer:

= 200 mL

Explanation:

Using the dilution formula;

M1V1 = M2V2 ;

Where, M1 is the concentration before dilution, V2 is the volume before dilution, while M2 is the concentration after dilution and V2 is the volume after dilution.

M1 = 2.0 M

V1 = 50 mL

M2 = 0.50 M

V2 = ?

V2 = M1V1/M2

= ( 2.0 × 50 )/ 0.5

= 200 mL

Therefore, the volume after dilution will be, 200 mL

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3 years ago

An inflated balloon contains X air molecules.After some time the volume of the balloon is found to be the half at the same tempe

astra-53 [7]

Answer:

(a): The balloon will contain $\frac{X}{2}$ number of molecules now.

(b): The gas law associated with this is Avogadro's law.

Explanation:

Avogadro's law states that the volume of the gas is directly proportional to the number of moles of the gas at constant pressure and temperature

Mathematically,

$V\propto n$ (At constant pressure and temperature)

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$ .....(1)

where,

$V_1\text{ and }n_1$ = Initial volume and number of moles

$V_2\text{ and }n_2$ = Final volume and number of moles

We are given:

$V_2=\frac{V_1}{2}$

Putting values in equation 1, we get:

$\frac{V_1}{n_1}=\frac{V_1}{2\times n_2}\\\\n_2=\frac{n_1}{2}$

(a):

If $n_1$ number of moles of gas contains X number of molecules

So, $\frac{n_1}{2}$ number of moles of gas will contain = $\frac{X}{n_1}\times {n_1}{2}=\frac{X}{2}$ number of molecules

Hence, the balloon will contain $\frac{X}{2}$ number of molecules now.

(b): The law used is Avogadro's law.

8 0

3 years ago

Which answer choice correctly names the element that Mendeleev predicted would be discovered and placed in the aluminum column?

Reika [66]

The answer is Ga.

That is gallium (Ga), correctly names the element that Mendeleev predicted would be discovered and placed in the aluminum column.

Gallium (Ga) is the element that Mendeleev predicted would be discovered and placed in the aluminum column.

So the answer is Gallium (Ga) that is there in the 13th group of periodic table or in aluminium column.

4 0

4 years ago

Read 2 more answers

A particular refrigerator cools by evaporating liquefied dichlorodifluoromethane, CCl2F2. How many kilograms of this liquid must

SCORPION-xisa [38]

Answer:

1.33 kilograms of this liquid must be evaporated to freeze a tray of water at 0°C to ice at 0°C.

Explanation:

Let the mass of liquefied dichlorodifluoromethane be x.

Mass of water to freeze = 571 g

Moles of water = $\frac{571 g}{18 g/mol}=31.7 mol$

Heat of fusion of ice = 6.02 kJ/mol

Heat lost when 1 mole of water freeze's = -6.02kJ/mol

Heat lost when 31.7 moles of water freeze's: Q

$Q=-6.02 kJ/mol\times 31.7 mol=-191. kJ$

Heat required to evaporate x amount of liquefied dichlorodifluoromethane: Q'

Q'= -(Q) = 191. kJ

Moles of liquefied dichlorodifluoromethane = $\frac{x}{121 g/mol}$

Heat of vaporization of dichlorodifluoromethane = 17.4 kJ/mol

$Q'=17.4 kJ/mol\times \frac{x}{121 g/mol}$

$191. kJ=17.4 kJ/mol\times \frac{x}{121 g/mol}$

Solving for x:

x = 1328.2 g = 1.33 kg

1 g = 0.001 kg

1.33 kilograms of this liquid must be evaporated to freeze a tray of water at 0°C to ice at 0°C.

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Collecting data I think

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