James placed a breath mint and a lump of toothpaste in a cup of water and let it sit overnight. Which statement best explains why the breath mint was gone the following morning, but the toothpaste was still at the bottom of the cup?
The breath mint was less soluble than the toothpaste.
The breath mint was more soluble than the toothpaste.
The breath mint had a lower density than the toothpaste.
The breath mint had a greater density than the toothpaste.
Which substance would MOST neutralize an acidic food?
Dairy (pH 5-7)
Option 2
Citrus fruit (pH 2-3)
Baking soda (pH 8-9)
Which sentence about the periodic table of elements is true? *
All elements in period 2 are metals.
All elements in group 18 are metals.
Metals are found on the left side of the periodic table.
Metals are found on the right side of the periodic table.
Steel is a metal that is made from iron and carbon. During the steel making process, iron and carbon are melted, blended together, and then allowed to harden into a solid. The iron and carbon do not chemically react with each other. After steel was made, 20 samples were taken from one piece and tested. Each sample contained 98% iron and 2% carbon. Which of the following terms best describes steel?
element
compound
homogeneous mixture
heterogeneous mixture
5. Which is an example of a chemical reaction?
nails rusting
glass melting
sugar dissolving
alcohol vaporizing
Bromine (Br) is a liquid at room temperature. Oxygen (O) is a gas at room temperature. Room temperature is 25° C. Which of the following statements is true?
The boiling point of oxygen is colder than room temperature.
The boiling point of bromine is colder than room temperature.
The melting point of oxygen is warmer than room temperature.
The melting point of bromine is warmer than room temperature.
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