NYSTCE ATAS NYSTCE Chemistry 4

Question 1

Which of the following best describes an atom that has gained one or more electrons?

Accepted Answer

An anion with a negative charge

Answer

An atom that gains electrons acquires extra negative charge and is called an anion.

Question 2

The Law of Conservation of Mass states that in a chemical reaction:

Accepted Answer

The total mass of reactants equals the total mass of products

Answer

Mass cannot be created or destroyed in a chemical reaction; the total mass of reactants always equals the total mass of products.

Question 3

Which type of mixture can be separated by filtration?

Accepted Answer

A suspension of sand in water

Answer

Suspensions contain large undissolved particles that can be physically trapped by a filter, unlike dissolved solutes in a solution.

Question 4

When balancing a chemical equation, which of the following may be changed to achieve balance?

Accepted Answer

The coefficients in front of formulas

Answer

Only coefficients (numbers in front of formulas) are changed to balance equations; subscripts cannot be altered because they define the compound.

Question 5

Which particle has negligible mass and orbits the nucleus of an atom?

Accepted Answer

Electron

Answer

Electrons have a very small mass (about 1/1836 of a proton) and occupy the electron cloud (orbitals) surrounding the nucleus.

NYSTCE ATAS - NYSTCE Assessment of Teaching Assistant Skills Practice Test