Organized information is easier to use. Which of the following explains how information about elements and their atoms is organized?

A: orbits

B: bases

C: indicator

D: periodic table

Is borax solution (water and borax) a suspension or a mechanical mixture?

A diatomic molecule shares three pairs of electrons. What type of bond is present in the molecule? A single covalent bond because each atom requires one more electron to complete its octet.

Which of the following is required to change the state of matter? addition or removal of heat decrease in temperature increase in temperature addition or removal of energy

Look at the chemical equation: Zn + 2HCl → ZnCl2 + H2 How many atoms of hydrogen (H) are present on both sides of the equation?

Select True or False from the pull down menus for the following statements. During fusion (melting), no heat has to be added to make the phase change under constant pressure.

Altering the pressure of a system can affect the rate of a chemical reaction. true false

What does ice cream melt on a hot day which type of thermal energy transfer does this melting represents

For which purpose do biochemists insert human genes into bacteria? to find a cure for the common cold to produce insulin for diabetics to kill resistant strains of bacteria to evolve certain species of bacteria

Cracks in rocks chemical or mechanical

A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins. A) 0.5 sec B) 0.3 sec C) 2.3 sec D) 1.9 sec