What characterizes a strong acid or base?

presence of a hydroxide or hydrogen ion

Which of the following statements is correct?

Red litmus paper turns blue when placed in a base.

Blue litmus paper turns red 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.

The pH scale measures...

...the concentration of hydrogen ions.

...the strength of hydrogen ions.

...the concentration of an acid

If an acid is combined with a base of equal strength, the result will most likely be

impossible to tell without testing the pH.

During science lab, students were asked to test a variety of common household substances and classify them as: acid, base, or neutral. Tests on shampoo produced the following results. felt slippery pH 8.5 turned red litmus blue These results indicate

This is not enough information.

A substance with a pH of 9 has

more OH - ions than H 3 0 + ions.

more H 3 0 + ions than OH - ions.

the same number of H 3 0 + ions as it does OH - ions.

Gardeners understand that plants have specific pH requirements. Most plants thrive in soil with a pH that is slightly acidic, neutral, or slightly basic. Imagine your soil is very acidic, with a pH of 3.5. How can you raise the pH to an appropriate level so your garden plants will survive?

Add a base like limestone or calcium carbonate.

Water frequently to wash away the acid.

Add organic matter like peat moss or humus.

Bradley was working in the lab. He accidentally poured a container of concentrated hydrochloric acid into his container of distilled water. Not thinking much of it, he continued with his work as if nothing happened. Which of these would be the result of this laboratory accident?

The solution has now become a good conductor of electricity.

The water will change to a bright pink color.

The new solution would decrease in temperature.

HCl and water have the same chemical and physical properties, so nothing would happen.

How does milk of magnesia act to calm an upset stomach?

The basic pH of milk of magnesia neutralizes any extra stomach acid.

Acidic milk of magnesia helps to counteract the stomach acid.

An upset stomach requires more acid instead of milk of magnesia.

Milk of magnesia has a neutral nature which dilutes the stomach acid.

Acids and Bases

Chemistry

8th - 12th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Measure of how acidic or basic something is.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Vinegar is an example of __________

A base

An acid

A neutral substance

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Bases are what range on the pH scale?

0-6.99

7.1-14

0-14

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

When found in food, acids are ________

Sour

Bitter

Salty

Slippery

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What are properties of acids?

Bitter, slippery, ph above 7

Sour, reacts with metals, ph below 7

Sour, reacts with metals, ph above 7

Bitter, ph of 7, does not react with metals

What are properties of a base?

Slippery, bitter, does not react with metals, pH above 7.

Slippery, bitter, reacts with metals, pH below 7.

Sour, reacts with metals, pH below 7

Sour, reacts with metals, pH above 7.

MULTIPLE CHOICE QUESTION

10 sec • 12 pts

A solution with a pH of 3.6 would be...

Acid

Base

Neutral

Acid and Base

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Acids and Bases

Measure of how acidic or basic something is.

Vinegar is an example of __________

Bases are what range on the pH scale?

When found in food, acids are ________

What are properties of acids?

What are properties of a base?

A solution with a pH of 3.6 would be...

Acids are what range on the pH scale?

A solution with a pH of 8.6 would be...

What is the only substance with a neutral pH of 7?

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