Final 2

During a chemical reaction, the reactants

• change phase but are the same molecules

• stays the same molecules.

• rearrange atoms to make new molecules.

• change their shape only.

A catalyst (speeds up something) would most likely speed-up a reaction by

• The reactants (what we start with) uses more energy

• The products(what you end with) uses more energy

• Products (what you end with) uses less energy

• the reaction takes less energy to happen

If we increase the surface area by crushing reactants (what you start with) into smaller particles, this will make a reaction ________

• slower

• stop

• faster

• reach equilibrium

Why does increasing temperature increase the rate (make it go faster) of reaction ?

• The particles move slower and cause less collisions.

• The particles move slower and cause more collisions.

• The particles move faster and cause more collisions.

• The particles move faster and cause less collisions.

Which of the following reactions would you expect to react (happen) the fastest?

• Cold water and a whole Alka seltzer tablet

• Hot water and a whole Alka seltzer tablet

• Cold water and a crushed Alka seltzer tablet

• Hot water and a crushed Alka seltzer tablet

The positive particles that are part of an atom are called

• protons and they orbit (outside of the nucleus) the nucleus .

• protons and they are inside the nucleus.

• electrons and they orbit (outside of the nucleus) the nucleus.

• electrons and they are inside the nucleus.

An atom has 18 protons (same as the atomic number; top number) and an atomic mass number (bottom number) of 40.  Which element is this?

• Argon

• Calcium

• Titanium

• Zirconium

The atomic mass (number of protons plus neutrons) of an atom containing 9 protons, 10 neutrons, and 9 electrons is

• 9  amu

• 18 amu

• 19 amu

• 28 amu

An atom has 15 protons, 16 neutrons, and 18 electrons.  This particle has an atomic number (number of protons) of ____ and an atomic mass of (number of protons plus neutrons) ______.

• 15, 33 amu

• 16, 31 amu

• 16, 34 amu

• 15, 31 amu

 The atomic mass (number of protons plus neutrons) of an atom containing 9 protons, 10 neutrons, and 9 electrons is In question #10 above, the particle represented is a(n) : Does it have more protons (positive) or electrons (negative)?

• Anion, -3 charge

• Cation, +3 charge

• Neutral atom, with no charge

• yes