Intro to Chemistry

What type of change is ripping paper?

• physical

• chemical

Answer explanation

you haven't changed the chemical properties of the paper, only changed the size and shape

What type of change is burning wood?

• physical

• chemical

Answer explanation

a new substance is formed- smoke and ash are produced from this change

What type of change occurs when silver tarnishes?

• physical

• chemical

Answer explanation

a new substance is formed- tarnish

What type of change occurs when sugar is dissolved in water?

• physical

• chemical

Answer explanation

no new substance is chemically created- sugar water can be separated

What part of the atom is positive (+)?

• proton

• electron

• neutron

• nucleus

What part of the atom is negative (-)?

• proton

• electron

• neutron

• nucleus

What part of the atom is neutral?

• proton

• neutron

• electron

• nucleus

What parts of the atom are in the nucleus?

• protons and electrons

• protons and nucleus

• electrons and neutrons

• protons and neutrons

How many protons does one atom of Potassium have?

• 19

• 8

• 39.098

What is the atomic number for Potassium?

• 19

• 8

• 39.098

Answer explanation

the atomic number (at the top of the square) is equal to the number of protons