Midterm Exam Review_2

Front

How should the following be recorded with the correct number of significant figures? \[ \frac{2070}{(8.314) (3.160)} \]

Back

78.8

Front

Condition for the photoelectric effect to occur is?

Back

Light frequency is above the threshold value.

Front

Number of protons in Sr²⁺. Atomic # = #protons.

Back

38 Protons

Front

Is F⁻ a cation, anion, or neutral?

Back

Anion

Front

What type of alloy forms when smaller atoms fit into spaces between larger atoms?

Back

Interstitial alloy.

Front

Define significant figures.

Back

Significant figures are the digits in a number that contribute to its precision, including all non-zero digits, zeros between significant digits, and trailing zeros in the decimal portion.

Front

What is the photoelectric effect?

Back

The photoelectric effect is the emission of electrons from a material when it absorbs light of sufficient frequency.

Front

What is an ion?

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

Define cation.

Back

A cation is a positively charged ion, formed when an atom loses one or more electrons.

Front

Define anion.

Back

An anion is a negatively charged ion, formed when an atom gains one or more electrons.