General Chemistry Mid-term Exam 12/17

Front

What happens to the electronegativity of elements in group 16 as you move from top to bottom?

Back

The electronegativity decreases.

Front

How many significant figures are in the number 4000?

Back

There are 4 significant figures.

Front

How do you calculate density?

Back

Density = mass/volume.

Front

What is the density of a solution that weighs 120 grams and has a volume of 30 mL?

Back

The density is 4 g/mL.

Front

How many valence electrons does an atom with 1 valence electron have?

Back

It has 1 valence electron.

Front

In which period of the periodic table is Barium located?

Back

Barium is located in period 6.

Front

Define electronegativity.

Back

Electronegativity is the ability of an atom to attract electrons in a chemical bond.

Front

What is the significance of significant figures in measurements?

Back

Significant figures indicate the precision of a measurement.

Front

What is the formula for calculating the number of valence electrons in an atom?

Back

The number of valence electrons is determined by the group number of the element.

Front

What is the relationship between atomic size and electronegativity?

Back

As atomic size increases, electronegativity generally decreases.