HW #13: Regents Review 3

According to the wave-mechanical model of the atom, an orbital is a region of the most probable location of

• an alpha particle

• a gamma ray

• an electron

• a proton

Which particles have approximately the same mass?

• an electron and an alpha particle

• an electron and a proton

• a neutron and an alpha particle

• a neutron and a proton

Compared to the energy and charge of the electrons in the first shell of a Be atom, the electrons in the second shell of this atom have

• less energy and the same charge

• less energy and a different charge

• more energy and the same charge

• more energy and a different charge

Which quantity can vary among atoms of the same element?

• mass number

• atomic number

• number of protons

• number of electrons

Tags

NGSS.HS-PS1-8

An atom that has 13 protons and 15 neutrons is an isotope of the element

• nickel

• phosphorus

• aluminum

• silicon

Which elements have the most similar chemical properties?

• Si, As, and Te

• N₂, O₂, and F₂

• Mg, Sr, and Ba

• Ca, Cs, and Cu

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which list includes three types of chemical formulas for organic compounds?

• covalent, metallic, isotopic

• covalent, metallic, molecular

• empirical, structural, isotopic

• empirical, structural, molecular

A sample of CO₂(s) and a sample of CO₂₍g) differ in their

• chemical compositions

• empirical formulas

• molecular structures

• physical properties

Tags

NGSS.MS-PS1-4

Which statement defines the temperature of a sample of matter?

• Temperature is a measure of the total electromagnetic energy of the particles.

• Temperature is a measure of the total thermal energy of the particles.

• Temperature is a measure of the average potential energy of the particles.

• Temperature is a measure of the average kinetic energy of the particles.

For a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the

• heat of fusion

• heat of reaction

• activation energy of the forward reaction

• activation energy of the reverse reaction

Tags

NGSS.HS-PS1-4