What are some non examples of systems.

Answers

Answer 1

Answer: Solar systems nuclear systems there are all types of systems which one do you prefer

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How many molecules are found in 0.589 moles of N2?

Answers

We know that

$1~mol$ have $6.02*10^(23)~molecules$

therefore

$0.589~mol$ have $0.589*6.02*10^(23)~molecules\approx3.55*10^(23)~molecules$

3.55 x 10^23 molecules are found in 0.589 of N2.

Carbon has four valence electrons, and chlorine has seven valence electrons. If carbon covalently bonds with chorine, which of the following would represent the Lewis dot (electron dot) structure?

Answers

Answer: The correct answer is Image 3.

Explanation:

Lewis dot structure is defined as the structure which represents the number of valence electrons around the atom. The electrons are represented as dots.

From the structure, we can easily determine the number of bonding and non-bonding electrons. Non-bonding electrons are considered as lone pair of electrons.

Carbon is the 6th element of the periodic table having electronic configuration of $1s^22s^22p^2$

This element has 4 valence electrons.

Chlorine is the 17th element of the periodic table having electronic configuration of $1s^22s^22p^63s^23p^5$

This element has 7 valence electrons.

The lewis dot structure for the compound $CCl_4$ is given below in the image attached.

Hence, the correct answer is Image 3.

1. It is wrong because each chlorine atom should have 3 lone pairs
2. It is wrong because carbon only has four valence electrons
3. It is correct because each chlorine has 3 lone pairs and carbon has 4 electrons covalently bonded with chlorine
4. It is wrong because chlorine only has 7 valence electrons and therefore it cannot have 3 lone pairs and 2 bond pairs for each of C-Cl bonds

Homogeneous mixture definition

Answers

It is a mixture that is uniform in both composition and properties.

Answer:

It is a mixture that is uniform in both composition and properties.

Explanation:

What is the nitrogen cycle?

Answers

Nitrogen cycle is the series of processess where nitrogen and its compound move through the environment and in living organisms. The processes here include fixation, ammonification, nitrification and denitrification. Majority of Earth's atmosphere is nitrogen.

Where are the protons and neutrons and electrons located in an atom?

Answers

The protons and neutrons are located in the nucleus of an atom, while the electrons are located in the orbital cloud.

Final answer:

Protons and neutrons are found in the nucleus of an atom while electrons are found in orbitals surrounding the nucleus. The number of protons determines the type of element the atom is.

Explanation:

In an atom, protons and neutrons are located in the nucleus, which is the central part of the atom. The electrons on the other hand, are situated in the areas around the nucleus called electron shells or orbits. Protons carry a positive charge, neutrons are neutral, and electrons carry a negative charge. The number of protons in an atom is what determines the atomic number and thus, the type of element it is.

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Use the following table to answer the question. Strong acids Weak acids Weak bases Strong bases HBr CH3COOH NH3 NaOH HCl HF NH4OH KOH H2SO4 HCN Cu(OH)2 Ca(OH)2 Which of these salts has the highest pH? K2SO4 Cu2SO4 NH4Cl NaCH3COO

Answers

Answer: D. NaCH3COO

Explanation:

Let's go through each of these salts and think about the reactions behind them. Keep in mind that the salt with the highest pH is the most basic.

(The underlined atoms can match the chemical formula for the salt. By matching the atoms, we can reason which bases and which acids reacted to produce a given salt.)

A. K2SO4

Using the table, we can assume that this salt was produced by with the reactants of the strong baseKOH and the strong acid H2SO4
A strong base and strong acid react to produce a more neutral salt, so this is likely the incorrect answer

B. Cu2SO4

Using the table, we can assume that this salt was produced by with the reactants of the weak baseCu(OH)2 and the strong acid H2SO4
A weak base and strong acid react to produce a more acidic salt, so this is likely the incorrect answer

C. NH4Cl

Using the table, we can assume that this salt was produced by with the reactants of the weak baseNH4OH and the strong acid HCl
A weak base and strong acid react to produce a more acidic salt, so this is likely the incorrect answer

D. NaCH3COO

Using the table, we can assume that this salt was produced by with the reactants of the strong baseNaOH and the weak acidCH3COOH
A strong base and weak acid react to produce a more basic salt, so this is likely the CORRECT answer

Final answer:

Sodium acetate (NaCH3COO) has the highest pH among the given salts because it is derived from a strong base and a weak acid, resulting in a basic solution upon dissolution in water.

Explanation:

The question asks which salt among K2SO4, CuSO4, NH4Cl, and NaCH3COO has the highest pH. To determine this, we consider the acidic or basic nature of the ions in each compound.

Sodium acetate (NaCH3COO) is formed from sodium hydroxide (NaOH), a strong base, and acetic acid (CH3COOH), a weak acid. When this salt dissolves in water, it produces Na+ ions and CH3COO- ions. The acetate ion can react with water to produce a small amount of OH- (hydroxide ions), causing the solution to be basic.

Ammonium chloride (NH4Cl) is derived from the weak base ammonia (NH3) and hydrochloric acid (HCl), a strong acid. This salt in solution will lower the pH due to the production of H+ ions from NH4+.

Potassium sulfate (K2SO4) and Copper(II) sulfate (CuSO4) are salts of sulfuric acid (H2SO4), a strong acid, and strong bases (KOH and Cu(OH)2 respectively). Since both strong acids and strong bases completely dissociate, the resulting salts typically do not affect the pH significantly.

Of these, NaCH3COO will have the highest pH because it creates a basic solution when dissolved in water.

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