If you live in Earth's northern hemisphere, on June 20th or 21st you experience summer solstice, which represents the official start of summer. This is the longest day of the year. What causes this change in day length?

Which of the following atoms releases more energy than oxygen when an electron is added to its valence energy level? Select one: a. helium (He) b. fluorine (F) c. carbon (C) d. nitrogen (N)

Ethene is the first member of the a. Alkane series b. Alkyne series c. Saturated hydrocarbons d. Unsaturated hydrocarbons e. Aromatic hydrocarbons

What will happen to the volume if the number of moles of a gas is decreased at constant temperature and pressure? The volume will increase. The volume will decrease. The volume will remain the same. The volume will be negative.

In distillation separation, breaking of azeotropes can be achieved a. by changing system pressure b. by adding an entrainer c. by adding a solvent and using Liquid-Liquid extraction d. by all of the above methods

A student is trying to solve the following problem by selecting the tile shown. Mass of container Which of the following statements is true? A. The student chose the wrong tile to solve the problem. B.

In which orbital does an electron in a bromine atom experience the smallest?

What characteristics of water allow it to have high surface tension?

Obtaining scientific data from a distance is called?

What is organic chemistry?

What is the total number of electrons shared in a double covalent bond between two atoms? (1) 1 (3) 8 (2) 2 (4) 4