HESI A2 CHEMISTRY EXAM QUESTIONS

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HESI A2 CHEMISTRY EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -100 Questions and Answers -format set of multiple-choice -Expert- Explanation

Question 1: What is the atomic number?

Answer:

The number of protons in the nucleus, defines an atom of a particular element.Question 2: How is the element being oxidized and the element being reduced identified?

Answer:

Determining the oxidation states of all elements in the compound.

Question 3: What is chemical bonding?

Answer:

The joining of an atom, element, or chemical to another.

Question 4: What do chemical reactions resemble?

Answer:

A cooking recipe.

Question 5: What are the charges on the ends of a dipole?

Answer:

Because electrons are shared unequally, the molecule, not the covalent bond will have a positive and a negative end or side.

Question 6: What is the effect of acids on metals?

Answer:

Acids are corrosive to metals.

Question 7: What is a solvent?

Answer:

The part of a solution the solute is being dissolved in.

Question 8: How penetrating is gamma radiation?

Answer:

Able to go through several feet of concrete or several inches of lead.

Question 9: What is a solute?

Answer:

The part of a solution being dissolved.

Question 10: What is radioactivity?

Answer:

The emission of particles and/or energy from an unstable nucleus.

Question 11: What is gamma radiation?

Answer:

High-energy electromagnetic radiation, similar to X-rays but with more energy.

Question 12: What are exceptions to the elemental oxidation rule?

Answer:

O2 H2 Br2 N2 I2 F2

Question 13: How are Isotope symbols written?

Answer:

With a superscript preceding the abbreviation of the element's symbol.

Question 14: How strong are dispersion forces?

Answer:

Dispersion forces are the weakest of all the inter-molecular forces.

Question 15: What is the structure of the periodic table?

Answer:

A series of rows called periods, and columns called groups.

Question 16: What is covalent bonding?

Answer:

When two atoms share electrons.A single covalent bond is the sharing of one pair of electrons.

Question 17: Group 2a of periodic table includes

Answer:

beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Question 18: What is the pH of a neutral solution?

Answer:

7

Question 19: What is biochemistry?

Answer:

The study of chemical processes in living organisms Question 20: What is the name and properties of group VIII of the periodic table?

Answer:

Noble gases.They tend to remain neutral in most situations, because their outer orbits are complete.

Question 21: Which elements are generally involved in hydrogen bonds?

Answer:

Fluorine (F) Oxygen (O2) Nitrogen (N)

Question 22: What are the four basic ways to increase the reaction rate?

Answer:

Increase temperature Increase the surface area of the reactants Add a catalyst Increase the concentration of the reactants.

Question 23: What is hydrogen in its ionic state?

Answer:

A proton

Question 24: How are chemical and nuclear reactions different?

Answer:

In chemical reactions, atoms try to achieve stable electron configurations In nuclear reactions, the atom tries to achieve stable nuclear configurations.

Question 25: What occurs in a decomposition reaction?

Answer:

Breaks a compound into its component parts.

Question 26: What causes equilibrium?

Answer:

The state in which reactants are forming products at the same rate that products are forming reactants.

Question 27: What are equilibrium reactions?

Answer:

Chemical reactions that stop before all the reactants are used to make the products.