Which of the following is at equilibrium? A Altering the concentration of a substance will not change the rates of the forward and reverse reactions. B The rate of the forward reaction is twice as fast as the rate of the reverse reaction. C The rate of the reverse reaction does not change. D The concentrations of the reactants and the products continue to change.

Which group of elements have a full octet of electrons? Click View Image' to look at the periodic table. a) Halogens b) Transition metals c) Noble gases d) Alkali metals

Fill in the Blank Question A $\square $ $\square $ shows all of the bonding and nonbonding electrons, but a $\square $ not. C Need help? Review these concept resources. Read About the Concept

Lab Technique: In the experiment, you can raise the reaction temperature by $\square $ You can increase the surface area by $\square $

Question 2 (2 points) Which type of bond is an electrical attraction between fully charged (not partially- charged)atoms? Covalent bond. Van Der Waals bond Hydrogen bond. Ionic bond. Hybrid bond.

Which of the following is the correct way to describe the ratio o volumes of the substances in the chemical equation? $2NH_{3}(g)\rightarrow N_{2}(g)+3H_{2}(g)$ 2 molecules $NH_{3}:1$ mole $N_{2}:3$ formula units $H_{2}$ $3LNH_{3}:2LN_{2}:2LH_{2}$ $3molesNH_{3}:1moleN_{2}:3molesH_{2}$ $2LNH_{3}:1LN_{2}:3LH_{2}$

Select the correct numerical value for the mass in grams, of $6.02\times 10^{23}$ atoms of C. 44.0 12.0 24.0 88.0

Which statement describes the action of a buffer composed of sodium hydrogen phosphate, $Na_{2}HPO_{4}$ and sodium dihydrogen phosphate, $NaH_{2}PO_{4}$ Both components, sodium dihydrogen phosphate and sodium hydrogen phosphate, neutralize added acid. Sodium hydrogen phosphate neutralizes added base, and sodium dihydrogen phosphate neutralizes added acid. Both components, sodium dihydrogen phosphate and sodium hydrogen phosphate, neutralize added base. Sodium dihydrogen phosphate neutralizes added base, and sodium hydrogen phosphate neutralizes added acid.

Identify the series of elements that are arranged in increasing electronegativities. Please use the table shown in figure $-2$ in lab introduction A $Al\lt Ge\lt P\lt B$ B $Se\lt S\lt Cl\lt Br$ C $Sc\lt Mg\lt N\lt O$ D $Mn\lt Ga\lt Si\lt C$

Part 1: Identify one property of water that allows water to dissolve the antibiotic. Part 2: Explain how the molecular structure of water influences this property.

Which of the following elements has the smallest atomic radius? Select one: a. cobalt b. potassium c. calcium d. gallium