Basic Chem for Bio

Negatively charged particles found outside of the nucleus of an atom are called ______.

• protons

• neutrons

• electrons

Elements are chemically combined substances that can be broken down into simpler substances.

• True

• False

What is the smallest 'building block' of the elements that make up the universe?

• An atom

• An electron

• A proton

• A cell

All of the naturally occuring elements on the planet are needed for organisms to survive.

• True

• False

An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have?

• 0

• 7

• 6

• 13

Which of the following is NOT an essential element?

• Sulphur (S)

• Potassium (K)

• Calcium (Ca)

• Boron (B)

The molecule C₆H₁₂O₆ contains how many elements?

• 1

• 3

• 12

• 24

Carbon is an essential element for all organisms.

• True

• False

Which combination of elements are the most abundant in living things?

• carbon, hydrogen, oxygen, and nitrogen

• carbon, helium, oxygen, and phosphorus

• oxygen, hydrogen, nitrogen, and potassium

• carbon, hydrogen, sodium, and nitrogen

Which of the following is NOT an essential molecule for living things?

• carbohydrates

• lipids (fats)

• proteins

• hydrogen peroxide