Science Flashcard

Front

Which statement describes the behavior of molecules when a substance changes from a gas to a liquid?

Back

The speed of the molecules decreases, because they have lower kinetic energy in the liquid state.

Front

Which element contains 20 protons and 19 electrons?

Back

An ion of calcium

Front

Why are the elements neon and argon not reactive?

Back

They have the maximum possible number of electrons in their outermost shell.

Front

Which element is shown in the image?

Back

Carbon

Front

According to placement in the periodic table, why is an ionic bond most likely to form between a metal and a nonmetal?

Back

An ionic bond forms between oppositely charged ions; metals and nonmetals are likely to be oppositely charged.

Front

A student wants to transform a sample of gaseous carbon dioxide into solid carbon dioxide. What must she do to accomplish this task?

Back

Remove energy from the sample.

Front

The table below lists the number of protons and neutrons contained in four different atoms. Which two atoms are isotopes of the same element?

Back

Atom 2 and Atom 3

Front

Evaporating water produces gaseous water. Which has occurred during this process?

Back

A physical change has NOT resulted in a new substance.

Front

Which property of matter is the student most likely investigating if the marble on the right reached the bottom in the water faster than it did in the oil on the left?

Back

Viscosity

Front

The chemical formula for water, H₂O, means that each water molecule contains which of the following?

Back

Two hydrogen atoms and one oxygen atom