Which is an element?

A. A carbon dioxide molecule

B. A copper pipe

C. Phosphorous and lithium joined together

D. An alloy of copper and iron

J5 protons and 74 electrons 9. As the number of neutrons in the nucleus of an atom increases, the nuclear charge of the atom A. decreases B. increases C. remains the same page 2 Chemistry CFA Unit 1

Define Oxidation number. Find the Oxidation number of a. Carbon in CO2. b. Sulfur in H2SO4. c. Phosphorus in PO4 3 - d. Manganese in MnO4 2-

Which unit would be most appropriate for measuring the mass of a black bean? kilograms or milligrams

Mendel identified a combination of "factors" inherited from each parent called a?

Who discovered copper and in what year?

A covalent bond between two atoms occurs when the atoms

Structural formula and type of reaction for each a) 4-nonene and fluorine b) hexane and oxygen gas c) pentanol and butanoic acid d) propane and hydrogen gas

Which statement is true for a pure compound but NOT true for a pure element?

Which one is uncelluar and which is multicelluar? crab or pond organism

An atom of lithium loses an electron. What is the effect of this event? Group of answer choices The atom of a different element is formed. The atom of lithium acquires no charge. The atom of lithium becomes a positively charged ion.