Explain difference in appearance between a pure substance and a mixture.

Answers

Answer 1

Answer:

A pure substance is a substance which cannot be separated physically or chemically. It is the same wherever found on earth. For example, pure gold is a pure substance. It will be the same whether it is found where you live or on another country. A mixture can be either homogeneous or heterogeneous. A homogeneous mixture is a mixture that looks the same throughout but is made of more than one element. An example of this would be salt and water mixture. A heterogeneous mixture is a mixture in which you can easily identify the different parts which make it up. An example of this would be pizza. Both these mixtures can be broken into different parts either physically or chemically.

Hope it helps :)

Answer 2

Answer: a pure substance means its like a natural substance that has not been tampered with, such as sodium. but when sodium is mixed with chlorine it becomes sodium chloride( table salt), which is a mixture.

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The 4 types of chemical reactions

Answers

Answer:

decomposistion,single replacement,double replacement,and sythesis

Explanation:

nmnbmm

How does paper chromatography work

Answers

Paper chromatography is an analytical method that is use to separate color substances in a piece of paper and can be used in a secondary and primary colored ink experimentation. The separation of ink is due to the solvent that is poured into the paper. Usually the solvent is used an Amino Acid

What is a beaker? can you also post a picture of what it ;looks like for me?

Answers

It's a piece of glassware used for handling liquids, usually in a laboratory,
although I use one as a coffee cup.

They have markings on the side, like a kitchen measuring cup, so you can
measure different amounts of liquid, and they have a lip for pouring.

They're also usually made of a special type of glass (borosilicate) so that
they won't crack when very hot liquids are poured in.

Here's a picture of a beaker with 200 milliliters of some blue stuff in it.

it looks like a bottle with a pointed tip

Calculate the mass in grams of a sample of Americium containing six atoms

Answers

Answer: $243* 10^(-23)$ grams

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023* 10^(23)$ of particles. and weighs equal to the molecular mass.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given atoms}}{\text {Avogadro's number}}=(6)/(6.023* 10^(23))=1.0* 10^(-23)moles$

1 mole of Americium weighs = 243 g

Thus $1.0* 10^(-23)moles$ of Americium weigh= $(243)/(1)* 1.0* 10^(-23)=243* 10^(-23)g$

Thus the mass mass in grams of a sample of Americium containing six atoms is $243* 10^(-23)$

The mass (in grams) of the sample of Americium containing six atoms is 2.42×10⁻²¹ grams

How to determine the mass of Americium containing six atoms?

First, we shall obtain the mole of americium that contains six atoms. This is illustrated below:

From Avogadro's hypothesis,

6.022×10²³ atoms = 1 mole of americium

Therefore, we can say that

6 atoms = 6 / 6.022×10²³

= 9.96×10⁻²⁴ mole of americium

Finally, we shall determine the mass (in grams) of the americium. Details below:

Mole of americium = 255163.41 moles
Molar mass of americium = 243 g/mol
Mass of americium = ?

Mass of americium = Mole × molar mass

= 9.96×10⁻²⁴ × 243

= 2.42×10⁻²¹ grams

Learn more about mass:

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A typical carbon atom has six protons, six neutrons, and six electrons. Which of these has the least amount of mass?A) one Proton
B) one Neutron
C) six Electrons
D) These masses are too tiny to measure

Answers

Answer:

Explanation:

Answer:

six electrons

Explanation:

Electrons have almost virtually no mass and much less than a proton and neutron.

(a neutron and electron have about 1 amu while electrons have 0.000548 amu)

How do some deep-water bacteria in the ocean make food?

Answers

Answer:

They make food by using chemosynthesis.

Explanation:

Final answer:

Deep-water bacteria, known as chemoautotrophs, make their own food through a process called chemosynthesis, using chemicals like hydrogen sulfide from hydrothermal vents instead of sunlight.

Explanation:

Some deep-water bacteria in the ocean are known as chemoautotrophs, which can produce their own food by using chemical energy from hydrothermal vents. Unlike plants, they do not use sunlight for photosynthesis. Instead, they rely on chemosynthesis for their energy supply. In this process, bacteria convert chemicals from the vents into usable energy or food. For example, some bacteria use hydrogen sulfide, a chemical abundant in the deep ocean, for chemosynthesis. This biological process allows these deep-water bacteria to thrive in environments where sunlight is not available.

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