Which of the following is the correct angle between the atoms in a tetrahedral molecule? A. 90o B. 109o C. 120o D. 270o

The balanced equation below represents a molecule of bromine separating into two bromine atoms. Br2-->Br + Br What occurs during this change? (1) Energy is absorbed and a bond is formed. (2) Energy is absorbed and a bond is broken.

What is an ephemeral stream? A) one that flows only after rainfall B) one that flows only in flat lands C) one that is formed only from mechanical weathering D) one that is formed only from chemical weathering

The net ionic equation, H3PO4 (aq) + 3 OH - (aq) Imported Asset PO4-3 (aq) + 3 H2O (l), best represents which type of acid-base reaction? strong acid-strong base weak acid-strong base strong acid-weak base weak acid-weak base

Calculate the mass defect of the nitrogen nucleus 14 7n. the mass mn of neutral 14 7n is equal to 14.003074 atomic mass units.

Describe the fate of the edges of two converging crustal plates. One plate is dense oceanic crust and the other is less-dense continental crust.

How do the number and kind of atoms in the reactants compare to the number and kind of atoms in the products

Scientists conduct experiments to collect evidence. Which of the following is the best definition of the word experiment as used by scientists?

The compound HCI is an example of a (n) A. covalent compound B. ionic compound C. element D. salt

Is the degree of highness or lowness of sound

A student has two substances at a lab table. One substance is iron pyrite (fool's gold) and the other is real gold. After placing a 20.0-gram sample of iron pyrite into 40.0 mL of water in a graduated cylinder, it displaces 4.0 mL of water.