1. An isotope is an atom of an element that varies in mass number due to variation in the number of:
A. atoms.
B. protons.
C. neutrons.
D. electrons.
is it C
2, A covalent bond is:
A. the attraction that one atom has for another atom.
B. the attraction between two atoms, formed by the sharing of electrons.
C. formed between the positive charge of a hydrogen atom in one molecule and the negative charge of a nitrogen atom in another nearby molecule.
D. the attraction between a positive ion and a negative ion.
is it A
3. Solutions are always comprised of:
A. solvents and solute.
B. liquids and solids.
C. water and salts.
D. compounds and ions.
is it A
A substance that is a solid
1. Yes, you are correct. An isotope is an atom of an element that varies in mass number due to variation in the number of neutrons (C).
2. No, that is not correct. A covalent bond is the attraction between two atoms, formed by the sharing of electrons (B).
3. Yes, you are correct. Solutions are always comprised of solvents and solutes (A).
1. The correct answer is C. Isotopes are atoms of the same element that have different numbers of neutrons, resulting in different mass numbers. The number of protons in an atom determines the element, and the number of electrons in a neutral atom is equal to the number of protons.
To determine the correct answer, you can recall that isotopes have different mass numbers, which implies a difference in the number of neutrons. Therefore, option C, which mentions variation in the number of neutrons, is the correct choice.
2. The correct answer is B. A covalent bond is formed when two atoms share electrons to achieve a stable electron configuration. This sharing of electrons leads to the formation of a molecule.
To find the correct answer, you can recall that a covalent bond involves the sharing of electrons between atoms. Option B clearly states this concept, making it the correct choice.
3. The correct answer is A. Solutions are homogeneous mixtures composed of a solvent, which is the substance present in a larger amount, and one or more solutes, which are substances dissolved in the solvent.
To determine the correct answer, you can recall the definition of a solution as a mixture of a solvent and solute(s). Option A correctly mentions solvents and solute, making it the correct choice.