Which balanced equation represents a chemical change? A) H2O () + energy → H2O (g) B) 2H2O () + energy → 2H2 (g) + O2 (g) C) H2O () → H2O (s) + energy D) H2O (g) → H2O () + energy

Which part of the nucleotide makes it possible for a nucleic acid to be a unique code? A.) Nucleotide base B.) Sugar C.) Phosphate

1. What is the oxidation number for the silver ion in tarnish?

Which best describes a stock solution that is used in a dilution? a concentrated solution a solution present in the largest quantity a dilute solution a solution present in the smallest quantity

The table shows the concentration of a reactant in the reaction mixture over a period of time. Reactant Concentration Time Concentration 0 s 1.8 M 210 s 1.2 M 450 s 0.8 M 580 s 0.6 M 720 s 0.

10 Baking soda (NaHCO3) decomposes when it is heated according to the equation below. How many kilojoules of heat are required to decompose 1.95 mol NaHCO3 (s) ? 2NaHCO3 (s) + 1290 - Na2CO3 (s) + H20 (9) + CO2 (9) 126 13 258 129 la • 2.53 x 107

What type of rock is sandstone

According to the Br? nsted-Lowry theory, water A. acts as a base when it accepts a hydrogen ion. B. can be neither an acid nor a base. C. can act as an acid by accepting hydrogen ions. D. can accept but not donate hydrogen ions.

Witch type of crust is thick and contains granite

A chemical base may be defined as a compound which contributes hydroxide ions or increases the OH concentration when dissolved in water. True False

Correct name for LiCl