CHEMISTRY HIGH SCHOOL

Which sample of matter can be separated into different substances by physical means?(1) LiCl(aq) (3) NH3(g)
(2) LiCl(s) (4) NH3(l)

Answers

Answer 1
Answer:

The sample of matter that can be separated into different substances by physical means is NH₃(g), which represents gaseous ammonia. Therefore, option D is correct.

Physical means, such as changes in temperature or pressure, can cause NH3 gas to condense into a liquid state (NH₃(l)) or freeze into a solid state (NH₃(s)). These changes in physical state can be reversed, allowing the substance to be separated into its different forms without changing its chemical composition.

Gaseous ammonia consists of individual NH₃ molecules that are not strongly bonded to each other. This state can be separated into its individual molecules using physical means.

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Answer 2
Answer:

Answer:

(1) LiCl(aq)

Explanation:

Question:

Which sample of matter can be separated into different substances by physical means?

1.      LiCl(aq) ✔

2.     LiCl(s) ❌

3.     NH₃(g) ❌

4.     NH₃(ℓ) ❌

Reason:

LiCl(a) is a mixture of a compound and water. The LiCl can be separated from the water. All the other choices are compounds.

Related Vocabulary:

- Aqueous: a water solution , indicated by the notion "(aq)". For example, HCl(aq) indicated a water solution of hydrochloric acid.

- Matter: Anything that has mass and takes up space.

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Elements in the same group on the periodic table have the same number of electrons

number of protons

number of neutrons

number of valence electrons

Answers

Elements in the same group have the same number of valence electrons labelled in Roman numerals.

Also, From left side-Right side of the periodic is in the following order - Alkali Metals, Alkali Earth Metals, Halogens then Noble gases in the Far right of the periodic table

Conductivity in a metal results from the metal atoms having(1) high electronegativity(2) high ionization energy(3) highly mobile protons in the nucleus(4) highly mobile electrons in the valence shell

Answers

The answer is (4). You may recall hearing about the "sea of electrons" model of metals. Metals represent the ultimate case of delocalized (shared) valence electrons, and these delocalized valence electrons are what freely move around, conducting current through the body of the metal.

The correct answer is (4) highly mobile electrons in the valence shell

The explanation:

-A metal consists of a lattice of atoms, each with a shell of electrons. This is also known as a positive ionic lattice.

- The outer electrons are free todissociate from their parent atoms and travel through the lattice, creating a sea of electrons, his valence electrons are what freely move around making the metal a conductor.

-When an electrical potential difference is applied across the metal, the electrons drift from one end of the conductor to the other under the influence of the electric field.

List 2 salts that would NOT be neutral and show/explain why.

Answers

I will tell you if you let me know your name and the name of your school

16 Which two gases can not be broken down by chemical means?(1) CO and He (3) Xe and He(2) CO and NH3 (4) Xe and NH3

Answers

Final answer:

The two gases that cannot be broken down by chemical means are He (helium) and Xe (xenon).

Explanation:

According to the question, we are looking for two gases that cannot be broken down by chemical means. Chemical means refer to chemical reactions that break down compounds into their constituent elements. The options given are (1) CO and He, (2) CO and NH3, (3) Xe and He, and (4) Xe and NH3.

CO and NH3 are both compounds that can be decomposed by chemical means. However, both He (helium) and Xe (xenon) are noble gases that cannot be broken down by chemical means. This is because noble gases have stable electron configurations, making them unreactive and resistant to chemical reactions. Therefore, the correct answer is (3) Xe and He.

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Waves with the shortest wave lengths have the highest

Answers

Answer:

shortest wavelength - gamma rays

highest wavelength - radio waves

Explanation:

Look at the electromagnetic spectrum

Answer:

I don't use your question?

How many moles of H2O are produced when 64.0 g C2H2 burns in oxygen

Answers

The balanced chemical reaction will be: 

C2H2 + 5/2O2 = 2CO2 + H2O

We are given the amount of C2H2 being burned. This will be our starting point.

64.0 g C2H2 (1 mol C2H2 / 26.02 g C2H2) (1 mol H2O/1mol C2H2) ( 18.02 g H2O/1mol H2O) = 44.32 g H2O.

Thus, the answer is 44.32 g H2O.
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