Chemistry Midterm Exam

Front

What do ionic bonds form from?

Back

Ionic bonds form from the attraction between metals and nonmetals.

Front

What is purposefully being manipulated and changed in an experiment?

Back

Independent Variable.

Front

How do you calculate percentage error?

Back

Percentage Error = |(Measured Value - Known Value) / Known Value| x 100.

Front

If the volume of a substance is measured as 4.53 ml and the known volume is 4.99 ml, what is the percentage error?

Back

9.42%.

Front

What can be said about the number of neutrons in isotopes of the same element?

Back

The number of neutrons can vary; for example, isotope A has more neutrons than isotope B.

Front

What charge do cations have?

Back

Cations have a positive charge.

Front

What happens to electrons in cations?

Back

Cations have lost electrons.

Front

What is the difference between independent and dependent variables?

Back

The independent variable is manipulated, while the dependent variable is measured.

Front

What is the role of a control group in an experiment?

Back

The control group serves as a baseline to compare the effects of the independent variable.

Front

What is an isotope?

Back

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons.