How does gas chromatography separate substances in a mixture of compounds?

Answers

Answer 1
Answer: Chromatography separates things according to their weight.

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Which of the following properties would be the same among isotopes of the same element?A. Flammability
B. Density
C. Melting point
D. Color

Answers

Answer : The properties which would be the same among isotopes of the same element are Flammability and Color

Explanation :

Isotopes are the elements that have same number of electrons and protons but they differ in number of neutrons.

The chemical properties of an element are determined by its valence electrons and since isotope have same number of electrons, they have similar chemical properties.

But isotopes have different number of neutrons. Neutrons are the subatomic particles which are present in the nucleus. They are charge less particles and they have mass. Therefore when the elements have different number of neutrons, their atomic masses differ.

As a result, isotopes have different mass related physical properties.

Let us discuss the given properties now

1) Flammability : Flammability in simple words means the ability of the substance to catch fire or the ability to burn. This is mainly dependent on the reactivity which is in turn dependent on the number of electrons.

Since the isotopes have same number of electrons, they show similar flammability.

2) Density : Density is defined as mass per unit volume. This property involves mass and we know that isotopes have different masses. Therefore they have different densities too.

3) Melting point : Melting point is a physical property which is mainly dependent on the molecular weight of the substance. Since isotopes have different masses, they tend to show different melting points.

4) Color : The color of the element is mainly dependent on the arrangement of electrons around the nucleus. Isotopes have same number of electrons which means the arrangement would also be the same. Therefore the isotopes of the same element do not show different colors.

The properties which would be same among isotopes of the same element are

1) Flammability

4) Color

Answer: D. Color

Explanation: Founders Educere answer.

So much for expert verified^^ smh

In which medium would sound move the fastest

Answers

Sound moves the fastest through a solid medium. Since the molecules within a solid are compactly or closely placed, so sound travels faster through it. It has already been experimentally proved that sound travels 17 times faster through a solid steel than through the air. This shows that sound can travel faster though a solid than through liquid or gas. Another way to prove that sound travels faster through solid is , if we place our ear in the railway line, then we can hear the sound of the train coming whereas the sound cannot be heard through the air.

What factor distinguishes a metallic bond from an ionic bond or a covalent bond

Answers

Answer:

The ionic bond occurs between two different atoms (metal and nonmetal), while the covalent bond occurs between two equal atoms (nonmetals),

Another difference between these is that the covalent bond is an electron compartment, while in the ionic bond there is an electron transfer.

Metal bonding occurs when metals are combined with each other. Metal atoms need to give up electrons to reach the configuration of a noble gas. In this case, the metals lose the valence electrons and an electron cloud forms between the positive nuclei.

The answer to this question is:

The mobility of electrons.

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A nickel is about 2 millimeters thick, or 2/1,000 of a meter how many nanometers is this

Answers

This is a unit conversion problem. Nm (nanometer) is smaller than mm (millimeter).

1 mm = 1/10³m = 1 x 10⁻³ m

1 nm = 1/10⁹ m = 1 x10⁻⁹ m

1 m = 1 x 10nm

 

Hence, 2 mm = 2 x 10⁻³ m

Then we can convert 2 x 10⁻³ m to nm by multiplying with 10.

Then 2 mm = 2 x 10⁻³ m = 2 x 10⁻³ x 10⁹ nm = 2 x 10⁶ nm.

Hence, the thickness of nickel is 2 x 10 nm.

A student is trying to calculate the density of an ice cream cone. She already knows the mass, but she needs to determine the volume as well. Which of the following formulas can be used to calculate the volume of the cone?V equals four-thirds times pi times r cubed
V equals one-third times pi times r squared times h
V = s3
V = πr2h

Answers

Answer: Option 1 --- V equals four-thirds times pi times r cubed

Explanation:

Letter
Using your research and data, you will write a three-paragraph letter to the park ranger detailing your findings.
Be sure to include the following in your letter:
• How is the Burmese python impacting the Everglades ecosystem?
• Why is it important to control the Burmese python population in Everglades
National Park?
• Based on your research, what method of controlling the python population do you believe would be most effective? Create a plan based on your chosen method.

Explain why burning is a chemical change in wood

Answers

The carbon element in wood reacts to the oxygen so it creates, energy as we all know as light and heat, ashes, and smoke. Hope this helps!
It is a chemical change in wood because a chemical change is when some object is being changed. So when fire burns on wood it changes how the wood is. The wood goes from whole to ash dust. Hope I could help. ;-)