Atoms and bonds are often represented in chemical structures by balls and sticks, but like organelles, are more complex than they are often represented. Later, you'll learn about bonds. For now, you'll explore what an atom is.

Is crushing a rock a chemical or physical change?

Which statement best describes the trend in atomic radii observed in the periodic table? 1. The atomic radii increase, moving across a period to the right and up in a group. 2.

What is the formula for manganese (IV) dioxide

Why do you think that if you drop two balls, exactly two balls rise on the other side at a similar speed? Why doesn't one ball fly off quickly instead? Why don't three balls fly off slowly?

Boyle's law states that the a. volume of a gas varies inversely with pressure. b. volume of a gas varies directly with pressure. c. temperature of a gas varies inversely with pressure. d. temperature of a gas varies directly with pressure.

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxide were formed (number of moles = mass (g) / molar mass (g/mol)) ? choose the closest answer. a. 0.21 moles b. 0.

Which of the following is the most likeley example of an favorable mutation A. A mutation that makes a rabbit able run faster B. A mutation that changes the rabbit's fur to bright orange C. A mutation that changes the color of the rabbit's eyes D.

Which of these mole ratios is possible for this reaction? FeCl3 + 3NaOH → Fe (OH) 3 + 3NaCl 1:1 1:3 3:1 2:3

The chemical equation for reduction of phosphorite Ca3 (PO4) 2

Synthesize What environmental effects are shared by all fossil fuels?