N5 SQA Unit 1

Front

Which of the following factors can increase the rate of a chemical reaction?

• Decreasing temperature
• Decreasing concentration of a reactant
• Increasing surface area
• Removing a catalyst

Back

Increasing surface area

Front

What is the role of a catalyst in a chemical reaction?

Back

It speeds up the reaction and remains unchanged

Front

How are elements arranged in the Periodic Table?

Back

By increasing atomic number

Front

What is the charge of a proton?

Back

One-positive

Front

In a neutral atom, the number of electrons is equal to the number of what?

Back

Protons

Front

What is the mass number of an atom equal to?

Back

Number of protons plus neutrons

Front

What defines isotopes of an element?

Back

Same atomic number but different mass numbers

Front

What type of bond forms between non-metal atoms?

Back

Covalent bond

Front

Characteristic of covalent molecular substances?

Back

Strong covalent bonds within molecules, weak forces between them

Front

Why do covalent network substances generally not conduct electricity?

Back

They do not have charged particles free to move