Vertical columns in the periodic table indicate what information?

A. periods

B. liquids

C. synthetic elements

D. groups and families

Why is chemical energy a part of all chemical reactions?

The first simple, one-celled organisms that developed during the Precambrian era are called

There are two boxes on either side of a pulley. One weighs 7.5kg and falls 4.5m in 1.25s. Find that box's acceleration and tension force, and the other box's mass.

Which refrigerator will be easier to roll over uneven ground?

Which piece of evidence did Alfred winger used to develop the theory of continental drift

In 2016, the city of Rio de Janeiro had a population density of 5377 people/km2. What was the population density of Rio in people per square meter?

Which kingdom consists only of complex multicellular, eukaryotic organisms which must consume or ingest other organisms for nutrition?

A boy throws a ball straight up in the air with an initial velocity of V+3 mls. The ball reaches a maximum height and starts towards earth. The boy catches the ball at the same height that it left his hand. How long is the ball in the air? 6. a.

Which of the following is a complex machine? 1) piano 2) bottle opener 3) shoehorn 4) doorknob

Which process can be used to power your Home? A solar thermal energy B solar electric energy C both solar thermal energy and solar electric energy D neither solar thermal energy not solar electric energy