Unit 1 Summative Assessment - REDO

Atoms of elements in the same group of the periodic table share the same what?

• valence electrons
• atomic numbers
• atomic masses

The farther an electron is from the nucleus, the more ___________ it has.

• mass
• charge
• energy

The total number of electrons in the outermost shell of a Potassium (K) atom is

• 1
• 2
• 8

Which of the following elements would be the most reactive?

• Iodine (I)
• Silicon (Si)
• Argon (Ar)

Which of the following elements would be the least reactive?

• Iodine (I)
• Silicon (Si)
• Argon (Ar)

Photosynthesis is an example of what type of chemical reaction?

• Exothermic
• Endothermic

How many Oxygens are in this molecule?

• 2
• 1
• 3

What are the smaller numbers that you CANNOT change in a chemical equation?

• Coefficients
• Subscripts
• Reactants

What are the larger numbers that you CAN CHANGE in a chemical equation?

• Coefficients
• Products
• Subscripts

Which statement is true regarding the chemical equation below?

• The 4 in front of the H20 on the product side needs to be a 6 in order to be balanced
• The CO2 on the product side needs a 2 in front of it in order for it to be balanced