Chemistry Midterm Review

What is the oxidation number for nitrogen?

• +1

• +4

• -3

• -2

The Noble gas family all have one property in common because they are gases at room temperature. That is they

• are combustible.

• are compressible.

• are relatively dense.

• have no definite shape but a definite volume.

Litmus paper is made from water-soluble dyes which are extracted from lichens. This paper is used as an acid-base indicator. Which of these common household substances would turn blue litmus paper red?

• distilled water

• baking soda

• vinegar

• ammonia

Has the symbol

• Alpha

• Beta 

• Gamma

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

• 2, 6, 3, 2

• it is already balanced

• 4, 12, 3, 4

• 2, 1, 4, 5

Tags

NGSS.MS-PS1-5

A student mixes vegetable oil and water in a beaker. Once the mixture settles, she notes that the oil is at the top, and the water is at the bottom. What does she know about the density of the oil?

• It is less than the density of the water.

• It is greater than the density of the water.

• It is the same as the density of the water.

Tags

NGSS.MS-PS1-2

Of the three liquids shown in the picture, which has the highest density?

• The yellow one

• The red one

• The blue one

Tags

NGSS.MS-PS1-2

Which of the following statements is correct?

• Blue litmus paper turns red when placed in a base.

• Red litmus paper turns blue when placed in a base.

• Blue litmus paper stays blue when placed in an acid.

• Red litmus paper stays red when placed in a base.

How many grams of K₂Cr₂O₇, are soluble in 100 g of water at 95 ºC?

• 83 grams

• 75 grams

• 40 grams

• 12 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

• Transition Metals

• Inner Transition Metals

• Metals

• Metalloids