Chemistry Regent Exam-June 2011

A neutron has a charge of

• +1
• +2
• 0
• -1

Which particle has the least mass?

• alpha particle
• beta particle
• neutron
• proton

A sample of matter must be copper if

• each atom in the sample has 29 protons
• atoms in the sample react with oxygen
• the sample melts at 1768 K
• the sample can conduct electricity

In the electron cloud model of the atom, an orbital is defined as the most probable

• charge of an electron
• conductivity of an electron
• location of an electron
• mass of an electron

The elements on the Periodic Table are arranged in order of increasing

• atomic number
• mass number
• number of isotopes
• number of moles

Which element has the highest melting point?

• tantalum
• rhenium
• osmium
• hafnium

In a chemical reaction, there is conservation of

• energy, volume, and mass
• energy, volume, and charge
• mass, charge, and energy
• mass, charge, and volume

Tags

NGSS.HS-PS1-7

At STP, both diamond and graphite are solids composed of carbon atoms. These solids have

• the same crystal structure and the same properties
• the same crystal structure and different properties
• different crystal structures and the same properties
• different crystal structures and different properties

The gram-formula mass of a compound is 48 grams. The mass of 1.0 mole of this compound is

• 1.0 g
• 4.8 g
• 48 g
• 480 g

Tags

NGSS.HS-PS1-7

Given the balanced equation representing a reaction: Cl₂ → Cl + Cl What occurs during this reaction?

• A bond is broken as energy is absorbed.
• A bond is broken as energy is released.
• A bond is formed as energy is absorbed.
• A bond is formed as energy is released.

Tags

NGSS.HS-PS1-4