1st Semester Chemistry Final Review

Front

What is the formula to calculate density?

Back

Density = Mass / Volume

Front

What is the density of an object with mass 65.14 g and volume 35.4 cm³?

Back

1.84 g/cm³

Front

What does it mean for an equation to be balanced in chemistry?

Back

A balanced equation has the same number of each type of atom on both sides of the equation.

Front

Is the equation NaHCO₃ ---> Na₂CO₃ + H₂O + CO₂ balanced?

Back

No

Front

What is a diatomic element?

Back

A diatomic element is an element that naturally exists as two atoms bonded together, such as O₂ or H₂.

Front

If an element is diatomic, what subscript does it have?

Back

2, only when it is an element.

Front

How does atomic radius change across a period in the periodic table?

Back

It decreases from left to right.

Front

Why does atomic radius decrease across a period?

Back

Because the number of protons increases, pulling the electrons closer to the nucleus.

Front

What is the electron configuration of Calcium (Ca)?

Back

1s² 2s² 2p⁶ 3s² 3p⁶ 4s².

Front

Which element has similar reactivity to Calcium (Ca)?

Back

Elements in the same group, such as Magnesium (Mg) or Barium (Ba).