CHEMISTRY HIGH SCHOOL

Chemistry Questions 3. What is true of a strong acid? A. It ionizes close to 100% in water B. It is a weak electrolyte C. It does not conduct electricity in solution D. It always has a high concentration 4. What substance is acting as the Bronsted-Lowry base in the forward reaction below? H2O + HCl --> H3O+ + Cl- A. H3O+ B. Cl- C. H2O D. HCl 5. Which of the following is NOT an acid-base neutralization reaction? A. NH3 + HCl --> NH4Cl B. NaOH + CH3COOH --> Na CH3COO + H2O C. 2 HNO3 + Ca(OH)2 --> Ca(NO3)2 + 2 H2O D. H2SO4 + 2 NaCl --> 2 HCl + Na2SO4

Answers

Answer 1

Answer:

Answer:

For 3: The correct answer is Option A.

For 4: The correct answer is Option C.

For 5: The correct answer is Option D.

Explanation:

For 3:

There are 2 types of solutions on the basis of pH.

An acid is defined as the chemical substance which looses hydrogen ions in a solution.

A weak acid does not completely dissociates into its ions but a strong acid completely dissociates into its ions when dissolved in water.

A base is defined as the chemical substance which looses hydroxide ions in a solution.

A weak base does not completely dissociates into its ions but a strong base completely dissociates into its ions when dissolved in water.

Hence, the correct answer is Option A.

For 4:

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

For the given chemical equation:

$H_2O+HCl\rightarrow H_3O^++Cl^-$

$H_2O$ is considered as a bronsted-lowry base because it is accepting hydrogen ion to form hydronium ion

HCl is considered as a bronsted-lowry acid because it is donating hydrogen ion to form chloride ion.

Hence, the correct answer is Option C.

For 5:

Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.

$HX+BOH\rightarrow BX+H_2O$

For the given options:

Option A:

The chemical equation follows:

$NH_3+HCl\rightarrow NH_4Cl$

This is an example of neutralization reaction because ammonia is considered as a base and when it reacts with HCl, it leads to the production of salt.

Option B:

The chemical equation follows:

$NaOH+CH_3COOH\rightarrow CH_3COONa+H_2O$

This is an example of neutralization reaction.

Option C:

The chemical equation follows:

$2HNO_3+Ca(OH)_2\rightarrow Ca(NO_3)_2+2H_2O$

This is an example of neutralization reaction.

Option D:

The chemical equation follows:

$H_2SO_4+2NaCl\rightarrow 2HCl+Na_2SO_4$

This is an example of double displacement reaction.

Hence, the correct answer is Option D.

Answer 2

Answer:
Strong acid does not conduct electricity. Question 4} A. H30 Question 5 } B. NaOH + CH3COOH

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According to Boyle's law, what would happen to the pressure of a gas if the temperature were tripled as the number of moles and the volume were held constant? A. The pressure would be one-third of its original value. B. The pressure would be one-ninth of its original value. C. The pressure would triple. D. The pressure would remain the same.
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What is the product(s) in this combination reaction? MgO + CO2

List three organelles found in cells and describe their functions.

Answers

1. Nucleus: Contains genetic material, controls cell activities.

2. Mitochondria: Produces energy through cellular respiration.

3. Golgi apparatus: Modifies and packages proteins.

1. Nucleus: The nucleus controls the cell by storing DNA instructions. It affects cell growth, reproduction, and metabolism by regulating gene expression.

2. Mitochondria: Cellular respiration powers mitochondria. They convert foods into cell energy source ATP. Metabolism and cell signalling depend on mitochondria.

3. Golgi apparatus: It changes and packages endoplasmic reticulum proteins and lipids. Cisternae are stacked membranous sacs. The Golgi apparatus adds carbohydrates or lipids to proteins, organises them into vesicles, and guides them within or outside the cell. It is crucial for intracellular transport and secretion.

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nucleus: controls cell

cell membrane: controls what goes in and out of a cell

cytoplasm: where chemical reactions take place

The bonds between hydrogen and oxygen in a water molecule are classified as(1) polar covalent(2) nonpolar covalent
(3) ionic
(4) metallic

Answers

(1) Ploar covalent. is the answer.

The relatively high boiling point of water is due to water havingA) hydrogen bonding
B) metallic bonding
C) nonpolar covalent bonding
D) strong ionic bonding

Answers

The answer is A because water molecules don't have metallic bonding, and water is also polar, and it takes more time for the heat energy to break down the hydrogen bonds

How many molecules in a mole?

Answers

Answer:

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.

Explanation:

hope this helped!

Where earth's plates move, they may slide alongside one another, pull apart, or A. Collies
B. Divide

Answers

The earth's plates move, slide alongside one another, pull apart, or collide. Therefore, option (A) is correct.

What is it called when tectonic plates collide?

If two tectonic plates of the earth collide there is the formation of a convergent plate boundary. One of the converging plates will usually move beneath the other is called subduction.

The fluids are released from the rock as the sinking plate moves deeper into the mantle, causing the overspreading mantle to partially melt. The new magma rises and forms volcanoes.

When two plates are pulling apart from each other, it is a divergent plate boundary. The magma rises from deep within the Earth along these boundaries and forms a new crust on the lithosphere. Most divergent plate boundaries form submarine mountain ranges known as oceanic spreading ridges and are underwater.

Another type of plate boundary that occurs when tectonic plates slide alongside one another is known as a transform plate boundary. As the earth's plates rub each other, large stresses can cause the rock to break, resulting in earthquakes.

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The answer is A...
Well one is usually heavier than the other plate so i think A

A mixture of uneven distribution and easy separation is called. homogeneous a solution heterogeneous a standard

Answers

The solutes dissolves in solvent results in the formation of a solution.

Those mixtures in which the components of mixture are uniformly distributed throughout the mixture are said to be homogeneous.

Those mixtures in which the components of mixture are not uniformly distributed throughout the mixture are said to be heterogeneous.

Those solutions whose concentrations are accurately known are known as standard.

Hence, a mixture of uneven distribution and easy separation is heterogeneous.

Answer:

A heterogenous separation!

Explanation:

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