CHEMISTRY HIGH SCHOOL

What sample is a pure substance?A. a test tube of zinc oxide.b. a container of zinc and oxygen.
c. a flask of pond water.
d. a jar of soil.

Answers

Answer 1
Answer: The correct answer is A. A test tube of zinc oxide. Zinc oxide is a compound which is a pure substance composed of two or more elements. They can only be separated or broken down into its individual elements or smaller compounds by chemical means. Therefore, the answer is a test tube of zinc oxide.
Answer 2
Answer:

The sample that is a pure substance is:A. a test tube of zinc oxide.

What sample is a pure substance?

A pure substance consists of only one type of substance with uniform properties throughout. In this case, a test tube of zinc oxide would be a pure substance. Zinc oxide (ZnO) is a chemical compound made up of zinc (Zn) and oxygen (O) atoms in a fixed ratio. It has a specific chemical formula and a consistent composition, making it a pure substance.

On the other hand:

B. A container of zinc and oxygen would be a mixture since it contains two different substances, zinc and oxygen, in their elemental forms.

C. A flask of pond water is a mixture because it contains a combination of different substances, such as water, dissolved minerals, microorganisms, and organic matter.

D. A jar of soil is also a mixture since it consists of a combination of various components, including minerals, organic matter, water, air, and possibly microorganisms.

Therefore, the correct answer is A. a test tube of zinc oxide, which represents a pure substance.

Learn more about pure substances at:

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What kingdom is humans in!

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It is in the Animalia kingdom.
We humans are apart of the animalia kingdom.

Why are units used that are to express the densities of gases different from those used to express the densities of solids or liquids

Answers

If the units for gases were the same as the units for numbers would be too small to be convenient.

For example, the density of iron is 7.87 g/cm³.

Using the same units, the density of hydrogen is 0.000 0899 g/cm³.

It is much more convenient to express the density in numbers that are easier to visualize: 0.0899 g/L, and that is still a small number.

Why are cells small?​

Answers

Because if a cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume.
They are also small so they can maximize the ratio of surface area to volume. Smaller cells have a higher ratio which allows more molecules and ions move across the cell membrane per unit of cytoplasmic volume.

basically cells are small because they need to be able to get the nutrients in and waste out quickly.

Answer:

you know what i really dont know but imagine if they were huge

Explanation:

You are studying the equilibirum between S8 and S2 gases at 0 celcius, you place a smaple of s2 in an otherwise empty, rigid container at an initial pressure of 3.-0 atm. wher eit reactsto form S8. at equilimrium, the partial pressure of s2 is 2.07 atm. calculate kp and kc.

Answers

Answer:

Kp and Kc are 0.01266 and 145.17, respectively.

Explanation:

Please check document attached.

what volume of .123 m naoh, in milliliters, contains 25.0 g of naoh? (density of the solution is 1.05 g / ml)

Answers

Answer:

8.46 liters of 0.123 NaOH contains 25.0 grams of NaOH.

Explanation:

Molar is defined as Moles/Liter.  0.123 M means there is 0.123 moles of NaOH per 1 liter.  We are asked to determine how many milliliters of this concentration NaOH it would take to deliver 25.0 grams of NaOH.

Use the units to guide the calculation.

Remember that:    Concentration x Volume = Moles

 (0.123 moles/liter)*(V) = moles

 We want 25.0 grams of NaOH.  Let's convert that to moles using the molar mass of NaOH:

(25.0 grams NaOH)/(24.0 g/mole) = 1.04 moles NaOH.

Now we can write:

 (0.123 moles/liter)*(V) = 1.04 moles NaOH

V = (1.04/0.123) Liters

V = 8.46 liters

Volatile organic compounds

Answers

Volatile organic compounds are compounds that easily evaporate at standard room temperature and pressure. They are considered harmful to the environment if regulations are not followed. Examples of this are:

Benzene

Ethanol

Benzopyrene

Ethenone

Acetic acid

Methane

Butane

Heptane

Pentane
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