1) Which pure substance is composed of more than one element?

A. carbon

B. gold

C. water

D. sodium

How many electrons will a fluorine (f) atom gain or lose in forming an ion?

What is the minimum total energy released when an electron and its antiparticle (positron) annihilate each other?

Evaporating water is an example of a physical change because

If two metals both have the same color, have similar densities, and are about the same size, but one is shiny and the other is dull, they can be separated based on the physical property known as what?

In what situation do covalent bods occur? A. electrons are shared by many atoms and move freely B. electrons are shared equally or C. a stronger atom pulls electrons away from the weaker atom

Which term refers to an electrochemical cell that produces an electric current? A) electrolyte B) voltaic cell C) electrolytic cell D) cathode

How can you determine the valence electrons in an electron configuration?

Methods used to reduce sulfur dioxide emissions from smokestacks are an attempt by humans to A lessen the amount of insecticides in the environment B eliminate diversity in wildlife C lessen the environmental impact of acid rain D use non chemical

What does 54 in mn-54 represent

Valerie wants to examine the properties of a thick liquid but is finding it difficult to pour the liquid into a beaker. She needs to finish her investigation before the end of class.