Which atom is larger Na or K? explain why.

Describe at least two ways that a researcher can minimize experimental errors in an investigation.

Describe the relationship between chemical reactions and thermal energy.

Standing near a campfire, you can feel heat. This is an example of a) acceleration b) conduction c) convection d) radiation

Why is bronze considered an alloy? a. Bronze can be shaped to make tools. b. Bronze is a hard, golden-brown metal. c. Bronze is made of the metals copper and tin. d. Bronze has been used by people for millennia.

Identify the activity that belongs in the field of chemistry. A. developing medicines B. analysis of a compound C. production of a new plastic D. all of the above

What product (s) forms at the cathode in the electrolysis of an aqueous solution of k2so4?

What element is used as a shield to protect people from radioactive substances?

The frequency of a given region of the electromagnetic spectrum is more than 3 x 1019 HZ. Note that the speed of light is 2.998 x 108 m/s. Which waves are found in this region? A. gamma rays B. visible light C. microwaves D. radio waves E. x-rays

A farmer uses water to irrigate his potato crops. Which roles of water does this examplify

How was helium first discovered?