Chemical Properties of Acids

Acids taste .....

• sour

• bitter

• sweet

• umami

Reaction between acid and alkali producing salt and water:

• Combustion

• Neutralization

• Precipitation

• Decomposition

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The color of universal indicator in hydrochloric acid:

• Red

• Blue

• Purple

• Green

Add dilute sulphuric acid slowly to a small amount of copper oxide in a watch glass with stirring. What do you observe in the above reaction?

• Copper oxide present in the watch glass dissolves in dilute H₂SO₄ and the colour of the solution becomes blue.

• Copper oxide present in the watch glass insoluble in dilute H₂SO₄ and the colour becomes black.

• Copper oxide present in the watch glass dissolves in dilute H₂SO₄ and the colour of the solution becomes crimson red.

• Copper oxide present in the watch glass dissolves in dilute H₂SO₄ and the colour of the solution becomes yellow.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A compound of a calcium reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle; turns lime water milky. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

• CaO + 2HCl ⇨ CaCl₂ + CO₂ + H₂O

• CaCO₃ + 2HCl ⇨ CaCl₂ + CO₂ + H₂

• CaCO₃ + 2HCl ⇨ CaCl₂ + O₂ + H₂O

• CaCO₃ + 2HCl ⇨ CaCl₂ + CO₂ + H₂O

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student reacted hydrochloric acid with sodium hydroxide, until the solution was neutral. Next he evaporated, the water from the beaker. She noticed that white crystals remained in the bottom of the beaker. The crystals were most likely…

• alkali

• acid

• water

• salt

Tags

NGSS.MS-PS1-2

A salt is formed when nitric acid combines with sodium hydroxide. What are present in the salt that forms?

• Sodium chloride
• sodium ions and nitrate ions
• only sodium ions
• only nitrate ions

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Pickles form by soaking in an acid. What are some properties of pickles

• Conducts electricity, bitter, turns litmus blue
• Slippery, sour, turns litmus blue
• Slippery, bitter, turns litmus blue
• Sour, turns litmus red, can conduct electricity

Tags

NGSS.MS-PS1-2

BASE + ACID ----> SALT +?

• water
• oxygen
• hydrogen ion
• hydroxide ion

Which of the following are CHEMICAL properties of acids?

• Reacts with metals to form salt and hydrogen gas

• Reacts with metal carbonates to form salt, water and carbon dioxide gas.

• Reacts with bases to form salt and water only

• Tastes sour