How do whales bats and dolphins use echolocation? to scare away predators, to orient themselves and to find food, to attract males, or to tell other animals of their species where they are?

How many grams of Cl are in 38.3 g of CHCl3?

A compound has an empirical formula of C2H5. What is true about this empirical formula? A. It models the structure of the compound. B. It shows the ratio of elements in the compound. C. It gives the mass of each atom in the compound. D.

If two nonmetals with the same electronegativity bond, what type of bond will form? A. Metallic bond B. Non polar ionic bond C. Ionic bond D. Non polar covalent bond

Compare and Contrast How are atoms and molecules the same How are they different?

Which of the following is not true about the structure of an alveolus? A. It has thick walls to trap gases that enter during the breathing B. It has many capillaries running through its structure C.

Water (3030 g) is heated until it just begins to boil. If the water absorbs 5.49*105 J of heat in the process, what was the initial temperature of the water?

Identify the number of core and valence electrons for each atom. Xe : core electrons Xe : valence electrons Ca : core electrons Ca : valence electrons Br : core electrons Br : valence electrons

What do the lines around the finger of the doorknob represent?

Identify what type of reaction is below. Also determine what coefficients that would balance the chemical equation.

Much of life on Earth is based in aquatic biomes. What property of water allows life to survive in liquid water?