Acids & Alkalis
Hazards
Ph Scale
Neutralization
Random
100

Metal oxides, metal hydroxides, and metal carbonates are all examples of _______

bases

100

What does the sign of a skull and crossbones tell you?

The substance is TOXIC

100

Name two substances that have a neutral pH?

water and milk

100

What is used to measure pH values?

Universal indicator

100

What does corrosive mean and what type of substances are corrosive?

damages other materials by wearing them away, used to describe strong acids

200

_____ are often called neutralisers or antacids.

Bases
200

What does the sign with a big X and little i tell you?

The substance is an IRRITANT, which means it would bother or inflame your skin and/or eyes.

200

If a substance has a pH of 9, is acid or alkali, weak or strong? And what color?

Alkali, weak, blue

200

What is neutralization?

a chemical reaction where an acid and a base react with each other and weaken each other + produces SALT and WATER

200

What should you do before mixing chemicals or measuring pH levels?

Follow safety measures - wear gloves, goggles, protective clothing

300

What is the difference between alkalis and bases?

All alkalis are bases but NOT all bases are alkalis.

Bases are substances that react with an acid to produce salt and water.

Alkalis are bases that can be dissolved in water.

300

What does the sign with a big X and small h mean?

The substance is HARMFUL

300

If a substance has a pH of 3, is acid or alkali, weak or strong? And what color?

Acid, strong, red

300

What do we call any compound formed by the neutralization of an acid by a base?

a salt

300

Alkalis are said to be __________ because they can burn and damage other materials.

caustic (similar to being corrosive for acids)

400

How do we test for the present of the gas hydrogen (produced by acid + metal)?

Use the pop (squeaky) test --> lighted splint put in test tube and if gas is present it POPS

400

What does a sign with a liquid dropping on and burning materials mean?

The substance is CORROSIVE.

400

Litmus test or limewater - what are these used for?

LITMUS paper - to test whether solution is acid or alkali

LIMEWATER - if limewater goes from clear to milky indicates carbon dioxide is present

400

How are salts named? (hint - has 2 parts)

First part: the metal, metal oxide, or metal carbonate

Second part: from the acid

EXAMPLE: Copper chloride, Sodium chloride, Zinc sulfate

400

(Neutralisation) Acid + Alkali = ?

Acid + Metal Oxide = ?

salt + water

500
Acids + metal = ?

salt + hydrogen

500

What does a sign with a flame mean?

The substance is FLAMMABLE - can easily be set on fire.

500

What is acid rain?

Rainwater that is more acidic than normal.

500

What do these salts end with? Nitric acid --> ____?, Hydrochloric acid --> ______?, Sulfuric acid --> ___?

Nitric acid --> NITRATE

Hydrochloric acid --> CHLORIDE

Sulfuric acid --> SULFATE

500

Acid + metal carbonate = ?

CLUE - CARBONATE--> ?

salt + water + carbon dioxide