Understanding Acids and Their Properties

In the movie 'Alien', what happens when the alien's blood comes into contact with the spaceship's metal decking?

• It causes the metal to rust.

• It immediately eats through the decking.

• It changes color.

• It solidifies on contact.

What does the pH scale measure?

• The color change in a solution.

• The density of a solution.

• The acidity or basicity of a solution.

• The temperature of a solution.

Which of the following is true about acids on the pH scale?

• They have a pH greater than 7.

• They have a pH of exactly 7.

• They have a pH less than 7.

• They do not appear on the pH scale.

What happens to hydrogen in hydrochloric acid when it is in water?

• It evaporates.

• It becomes a hydrogen ion.

• It remains unchanged.

• It forms a solid.

What is a hydrogen ion essentially equivalent to?

• An electron.

• A complete hydrogen atom.

• A neutron.

• A naked proton.