What do plants need to grow?

18. which bond is most polar? H--F H--Cl H--Br H--I

1. What is polarity? a. An ionic bond with unequal electrons b. An ionic bond with equal electrons C. A molecule with equal electrons d. A molecule with unequal electrons

An unbalanced chemical equation is shown: 2NaN3 → 2Na + N2 Which of the following statements explains why the equation is not balanced? (a. Four molecules of N2 should be produced during the decomposition. (b.

Choose all the true statements concerning the law of conservation of mass: a) When ice melts, mass is gained since water is more dense than ice.

Gas stored in a tank at 273 K has a pressure of 388 kPa. The safe limit for the pressure is 825 kPa. At what temperature will the gas reach this pressure?

Dioxin, produced as a by-product of various industrial chemical processes, is suspected of contributing to the development of cancer and birth defects in animals and humans.

How do you find the - Atomic number Atomic Mass protons electrons neutrons group period of an element?

HCl gas is introduced at one end of the tube, and simultaneously NH3 gas is introduced at the other end. When the two gases diffuse through the cotton plugs down the tube and meet, a white ring appears due to the formation of NH4Cl (s). Why is this?

How do scientist classify climates

How many molecules of liquid ethanol are in 1.00mL of ethanol, given its density of 0.789 g/mL