HESI A2 Chemistry:Questions and Correct Answers
Group 1a of the periodic table includes - hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb),
cesium (Cs), and francium (Fr).
*Highly Nasty Kids Rub Cats Fur*
Group 2a of periodic table includes - beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba),
and radium (Ra).
How are chemical and nuclear reactions different? - In chemical reactions, atoms try to achieve stable electron
configurations
In nuclear reactions, the atom tries to achieve stable nuclear configurations.
How are Isotope symbols written? - With a superscript preceding the abbreviation of the element's symbol.
How can beta radiation particles be stopped? - By a thin sheet of aluminum foil, Lucite, or plastic. These
particles have virtually no mass.
How do the sugar-phosphate chain run in the DNA structure? - Antiparallel: Opposite directions, one up and
one down.
How does increasing the surface area of the particles in a reaction speed chemical reactions? - Gives the
Particles more opportunities to come in contact with each other.
How does the body use fat? - To insulate body organs against shock, maintain body temperature, keep skin and
hair healthy, promote healthy hair function, energy storage.
How does the structure of DNA differ from that of RNA? - RNA is a single strand of ribose, a five carbon
carbohydrate, in a sugar-phosphate chain.
RNA does not use thymine to form one of its base pairs, instead it uses uracil to bind with adenine.
, How is a dipole created? - When an electron pair is shared unequally in a covalent bond between two atoms or
elements.
How is the element being oxidized and the element being reduced identified? - Determining the oxidation
states of all elements in the compound.
How large are alpha radiation particles? - The largest of radioactive emissions.
How many amino acids in humans are necessary to make all proteins for life? - 20
How penetrating is gamma radiation? - Able to go through several feet of concrete or several inches of lead.
How strong are dispersion forces? - Dispersion forces are the weakest of all the inter-molecular forces.
How strong are hydrogen bonds? - Hydrogen bonds are 5-10% as strong as covalent bonds, making them the
strongest of the inter-molecular forces.
Rules for balancing chemical equations (stoichiometry) - 1)Determine the correct formulas for all the reactants
and products in the reaction.
2)Begin balancing with the most complicated-looking group. A polyatomic ion that appears unchanged on both
sides of the equation can be counted as a single unit.
3)Save the elemental (single elements) reactants and products for last, especially if it is hydrogen or oxygen.
4)Keep your eye out for diatomic molecules such as oxygen, hydrogen, and the halogens.
5)If you get stuck, double the most complicated-looking group and try again.
6)Finally, make sure that all coefficients are in the lowest possible ratio.
7)No fractions! Don't mess with subscripts.
The halogens include - fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At)
Group 1a of the periodic table includes - hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb),
cesium (Cs), and francium (Fr).
*Highly Nasty Kids Rub Cats Fur*
Group 2a of periodic table includes - beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba),
and radium (Ra).
How are chemical and nuclear reactions different? - In chemical reactions, atoms try to achieve stable electron
configurations
In nuclear reactions, the atom tries to achieve stable nuclear configurations.
How are Isotope symbols written? - With a superscript preceding the abbreviation of the element's symbol.
How can beta radiation particles be stopped? - By a thin sheet of aluminum foil, Lucite, or plastic. These
particles have virtually no mass.
How do the sugar-phosphate chain run in the DNA structure? - Antiparallel: Opposite directions, one up and
one down.
How does increasing the surface area of the particles in a reaction speed chemical reactions? - Gives the
Particles more opportunities to come in contact with each other.
How does the body use fat? - To insulate body organs against shock, maintain body temperature, keep skin and
hair healthy, promote healthy hair function, energy storage.
How does the structure of DNA differ from that of RNA? - RNA is a single strand of ribose, a five carbon
carbohydrate, in a sugar-phosphate chain.
RNA does not use thymine to form one of its base pairs, instead it uses uracil to bind with adenine.
, How is a dipole created? - When an electron pair is shared unequally in a covalent bond between two atoms or
elements.
How is the element being oxidized and the element being reduced identified? - Determining the oxidation
states of all elements in the compound.
How large are alpha radiation particles? - The largest of radioactive emissions.
How many amino acids in humans are necessary to make all proteins for life? - 20
How penetrating is gamma radiation? - Able to go through several feet of concrete or several inches of lead.
How strong are dispersion forces? - Dispersion forces are the weakest of all the inter-molecular forces.
How strong are hydrogen bonds? - Hydrogen bonds are 5-10% as strong as covalent bonds, making them the
strongest of the inter-molecular forces.
Rules for balancing chemical equations (stoichiometry) - 1)Determine the correct formulas for all the reactants
and products in the reaction.
2)Begin balancing with the most complicated-looking group. A polyatomic ion that appears unchanged on both
sides of the equation can be counted as a single unit.
3)Save the elemental (single elements) reactants and products for last, especially if it is hydrogen or oxygen.
4)Keep your eye out for diatomic molecules such as oxygen, hydrogen, and the halogens.
5)If you get stuck, double the most complicated-looking group and try again.
6)Finally, make sure that all coefficients are in the lowest possible ratio.
7)No fractions! Don't mess with subscripts.
The halogens include - fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At)
