Chemistry MOCK ACP Sem 1

Front

What is the relationship between frequency and energy of UV rays?

Back

UV rays have a higher frequency than visible light, which means they have more energy.

Front

Which two elements are in the same group and have similar chemical properties?

Back

Beryllium (Be) and Magnesium (Mg) are in Group 2 and have similar chemical properties.

Front

How do you calculate the percent composition by mass of an element in a compound?

Back

Percent composition = (mass of element in 1 mole of compound / molar mass of compound) x 100%.

Front

What happens to atomic radius and ionization energy as you move down a group in the periodic table?

Back

Atomic radius increases and ionization energy decreases.

Front

What is a chemical change? Give an example.

Back

A chemical change involves a transformation that alters the chemical composition of a substance. Example: Digestion of food.

Front

What is a physical change? Give an example.

Back

A physical change does not alter the chemical composition of a substance. Example: Chopping vegetables.

Front

What is the molar mass of calcium sulfate (CaSO4)?

Back

The molar mass of CaSO4 is approximately 136.14 g/mol.

Front

What is ionization energy?

Back

Ionization energy is the energy required to remove an electron from an atom in its gaseous state.

Front

What is the trend in ionization energy across a period in the periodic table?

Back

Ionization energy generally increases across a period from left to right.

Front

What is the significance of the periodic table's groups?

Back

Elements in the same group have similar chemical properties due to having the same number of valence electrons.