What is the smallest part of an element that still has the properties
of that element?

• an atom
• a compound
• a molecule
• a nucleus

Tags

NGSS.MS-PS1-1

Ammonia is a common base used in household cleaning products. What color will litmus paper turn when placed in a solution of ammonia?

• blue
• yellow
• green
• red

Tags

NGSS.MS-PS1-2

Based on its pH level, which of the following is an acid?

•  sea water, pH=8.25
• detergent, pH=10
• milk, pH=6.5
• human saliva, pH=7

Tags

NGSS.MS-PS1-2

 Distilled water has a pH of 7. According to the pH scale, it is classified as_____________.

• base
• neutral
• an acid
• a solution

When dissolved in water, acids produce:

• bases
• salts
•  hydrogen (H⁺) ions
•  hydroxide (OH^-) ions

Tags

NGSS.MS-PS1-2

Which will form hydroxide ions in solution?

• a base
• an acid
• an alloy
• a neutral substance

Tags

NGSS.MS-PS1-2

Explain what happens when a strong acid and a strong base are poured into the same container.

• They form separate layers.
• They mix physically but not chemically.
• They break apart into separate elements.
• They react chemically to form a salt.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Any substance that produces hydroxide ions in water is known as _______________.

• an acid
• a hydrogen ion
• a base
• a neutral

Antacids are used to fight stomach acid and relieve heartburn. Which of the following would make the best antacid?

• a weak acid
• a base
• a strong acid
• a neutral substance

If vinegar and lemon juice are weak acids, what do you think is generally true about the taste of acidic foods? They taste__________.

• bitter
• sweet
• sour
• salty