Matter and Energy

Which subatomic particle has a mass of 1/1836 amu, a negative charge, and is located outside of the nucleus?

• Protons

• Neutrons

• Electrons

Which subatomic particle has a mass of 1 amu, a neural charge, and is located inside the nucleus?

• Protons

• Neutrons

• Electrons

What characteristic is the most important information to know when trying to determine an element’s identity?

• Protons

• Valence Electrons

• Electrons

• Neutrons

Which element shown below would be the least reactive?

• Na

• Ne

• Cl

Using a Periodic Table, identify two elements that would have the same number of valence electrons as Calcium (Ca).

• Mg and Ba

• K and Sc

• Sr and Sc

The chemical formula for Copper Sulfate is shown below. How many elements that make up this compound?

CuSO₄

• 6

• 4

• 3

• 2

Which statement best describes matter and energy?

• Matter is different from energy because matter is always destroyed in a chemical reaction.
• Matter is similar to energy because matter is always conserved in a chemical reaction.
• Matter is similar to energy because matter is always created in a chemical reaction.

1. Complete the following statement: “Energy _______________, while matter _____________ through the environment.”

• Flows, flows.

• Flows, cycles.

• Cycles, flows.

• Cycles, cycles.

What was the original (before the discovery of photosynthesis) hypothesis that explained how plants grew and gained so much mass throughout their lives?

• Plants “eat” soil through their roots

• Breathing in carbon dioxide through their leaves

• Converting sunlight into a form of matter

• Spontaneous generation

Jean Baptiste von Helmont planted a 5-pound Willow tree sapling in 200 pounds of dry soil. He re-measured both the tree and the soil after five years of growth. What changed? (Select all that apply)

• The tree gained a significant amount of mass.

• The mass of the soil decreased significantly.

• Neither the tree nor the soil experienced a significant change in mass.

• The mass of the soil decreased slightly