Chemistry Regent Exam-June 2010

The gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil

• passed through the foil
• remained trapped in the foil
• were deflected by the nuclei in gold atoms
• were deflected by the electrons in gold atoms

Which subatomic particles are located in the nucleus of a carbon atom?

• protons, only
• neutrons, only
• protons and neutrons
• protons and electrons

Which part of a helium atom is positively charged?

• electron
• neutron
• nucleus
• orbita

Tags

NGSS.HS-PS1-8

The mass of a proton is approximately equal to the mass of

• an alpha particle
• an electron
• a neutron
• a positron

At STP, solid carbon can exist as diamond and graphite. Compared to the molecular structure and chemical properties of diamond, graphite has

• a different molecular structure and different properties
• a different molecular structure and the same properties
• the same molecular structure and different properties
• the same molecular structure and the same properties

Which Group 14 element is classified as a metal?

• carbon
• germanium
• silicon
• tin

The light emitted from a flame is produced when electrons in an excited state

• absorb energy as they move to lower energy states
• absorb energy as they move to higher energy states
• release energy as they move to lower energy states
• release energy as they move to higher energy states

Tags

NGSS.HS-PS4-3

An atom of which element has the greatest attraction for electrons in a chemical bond?

• As
• Ga
• Ge
• Se

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which formula represents a polar molecule?

• H₂
• H₂O
• CO₂
• CCl₄

Tags

NGSS.HS-PS1-1

Two categories of compounds are

• covalent and molecular
• covalent and metallic
• ionic and molecular
• ionic and metallic