All categories

3 years ago

Choose the pure substance from the list below. Choose the pure substance from the list below.

Chemistry

1 answer:

Vesnalui [34]3 years ago

7 0

Answer:

carbon monoxide is a pure substance because it cannot be separated by any physical method.

Explanation:

A pure substance is also known as chemical substance, it is a form of matter having constant chemical composition and characteristic properties.

Also a pure substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.

A mixture of milk and water (tea) can be separated by filtration (physical method).

A mixture of of sugar and water can be separated by distillation (physical method).

Also a casserole, pomegranate juice are separated using physical methods.

However, carbon monoxide constant chemical composition and characteristic properties, and it cannot be separated by physical method.

Therefore, carbon monoxide is a pure substance.

You might be interested in

A solution used to chlorinate a home swimming pool contains 7% chlorine by mass. An ideal chlorine level for the pool is one par

deff fn [24]

Answer:

Volume of chlorine = 61.943 mL

Explanation:

Given:

Volume of the water in the Pool = 18,000 gal

also,

1 gal = 3785.412 mL

thus,

Volume of water in pool = 18,000 × 3785.412 = 68,137,470 mL

Density of water = 1.00 g/mL

Therefore,

The mass of water in the pool = Volume × Density

The mass of water in the pool = 68,137,470 mL × 1.00 g/mL = 68,137,470 g

in terms of million = $\frac{\textup{68,137,470}}{\textup{ 1,000,000}}$

= 68.13747 g

also,

1 g of chlorine is present per million grams of water

thus,

chlorine present is 68.13747 g

Now,

volume = $\frac{\textup{Mass}}{\textup{Density}}$

Volume of chlorine = $\frac{\textup{68.13747 g}}{\textup{1.10 g/mL}}$

Volume of chlorine = 61.943 mL

3 0

3 years ago

Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the equation: CO2(s)→CO2(g). Whe

MA_775_DIABLO [31]

Answer:

6.82 kg

Explanation:

Given that the amount of water is 15L and we know that the density of water is ≈ 1kg/L. The mass of water is given by mass = volume x density, i.e,

mass = 15 x 1 = 15 kg. Also the specific heat capacity of water is 4.186 KJ/kg.

The sublimation enthalpy of dry ice is 571 KJ/kg.

Now, the amount of heat lost by water is entirely used up for the sublimation (conversion from soild to gas) of dry ice. And the heat (Q) lost by water is given as : Q = mCΔT, where m is the mass of water, C the specific heat capacity of water and ΔT the change in temperature.

Here, Q = 15 x 4.186 x (90 - 28) = 3892.98 KJ.

This amount of heat is taken up by the dry ice for its sublimation. Also the energy taken by dry ice (Q') for its sublimation is given by: Q' = m'L', where m' is the mass of dry ice, L' is the latent heat of sublimation (i.e, the amount of heat required per kg of a substance to sublime) of dry ice amd L' = 571 KJ/kg.

Now, Q' =m'L' = heat lost by water = 3892.98KJ.

And, m'L' = m' x 571 KJ/kg = 3892.98 KJ. (Dividing with 571)

Therefore, m' = 6.82 kg.

6 0

3 years ago

Arrange the steps typically followed in the data preparation process in the order of occurrence. (Place the first step at the to

Pavel [41]

Data validation → editing data → entry data → tabulation

This enables better integration, consumption and analysis of larger datasets using advanced business intelligence with analytics solutions.

<h3>What is data preparation ?</h3>

Data collection, combination, structure, and organisation are all steps in the process of preparing data for use in business intelligence (BI), analytics, and data visualisation applications.

Data prep is a common colloquial term for data preparation. It is also referred to as "data wrangling," while other professionals use that phrase more specifically to mean "cleaning, structuring, and transforming data." This usage distinguishes data wrangling from the data pretreatment stage.

Learn more about Data preparation here:

brainly.com/question/28056387

#SPJ4

3 0

1 year ago

-. Is Electricity naturally produced in our environment.

andre [41]

Electricity is not a naturally occurring energy phenomenon like oil from the ground, but it must be created and refined at electrical power plants using other energy sources. The natural resources that create electric energy are usually non-renewable, with some exceptions.

Hope this helps

5 0

3 years ago

Now they feel it is best to have you identify an unknown gas based on its properties. Suppose 0.508 g of a gas occupies a volume

pishuonlain [190]

Answer: Option (b) is the correct answer.

Explanation:

The given data is as follows.

mass = 0.508 g, Volume = 0.175 L

Temperature = (25 + 273) K = 298 K, P = 1 atm

As per the ideal gas law, PV = nRT.

where, n = no. of moles = $\frac{mass}{\text{molar mass}}$