The origin of chocolate can be traced back to 1000 BC in central America or present day Mexico. Chocolate from this time in history was made from roasted and ground Cacao seeds mixed with water, cornmeal, and chilies, and was often served to royals and at special occasions. Unsweetened chocolate has a very bitter taste. What does this taste indicate about some of the compounds in unsweetened chocolate?

• They are acidic.

• They are basic.

• They are neutral.

• They are salts.

What is one of the characteristics of an acidic compound?

• pink color

• slippery feel

• unpleasant odor

• sour taste

Sean is a Chemist that specializes in cosmetics. Zinc sulfide is a compound used in the production of "glow in the dark" nail polish and make up. In the laboratory, Sean will react zinc and sulfur combine to form zinc sulfide (ZnS). Can you determine which type of reaction creates this compound? Zn (s) + S (s) → ZnS (s)

• synthesis

• decomposition

• single replacement

• double replacement

Which set of two elements will form an ionic bond?

• Mg and Cl

• N and O

• Fe and Co

• Rb and Al

Amelia is trying to replace a wire to her car battery which has become damaged. She can only find a smaller diameter wire in the store she is shopping in. How would decreasing the diameter of the wires in a circuit influence the resistance and flow of electrons in the circuit?

• It would decrease the resistance, causing fewer electrons to flow through the circuit.

• It would increase the resistance, causing fewer electrons to flow through the circuit.

• It would decrease the resistance by allowing more electrons to flow through the circuit.

• It would increase the resistance by allowing more electrons to flow through the circuit.

In February of 2023 a major ice storm occurred in Kalamazoo Michigan. Up to 0.75 inches of ice accumulated on trees and buildings causing major damage across the city. Residents endured severe icy conditions for days until temperatures rose above zero degrees and melting could begin. When ice begins to melt at 0°C, water molecules

• begin to lose some of their atomic mass.

• break apart into individual water atoms.

• move more freely in relation to each other.

• release heat to the surrounding atmosphere.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

All of the following are properties of silver, which of the following is a chemical property of silver?

• malleable

• ductile

• conductor of heat

• reacts with nitric acid

Tags

NGSS.MS-PS1-2

Which of the following is a chemical property of a substance?

• mass of 372 g

• reacts with HCl

• density of 37 g/cm³

• white powder with silver specks

An enclosed 20 mL metal cylinder was filled with a gas sample at room temperature. The sample then was transferred to an empty 40 mL enclosed container, also at room temperature. After being transferred, the volume of the gas was

• 10 mL.

• 20 mL.

• 30 mL.

• 40 mL.

Matter is needed to transfer thermal energy by ________.

• Conduction

• Convection

• Radiation

• Both conduction and convection

• Conduction, convection, and radiation

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4