Zirconium has an atomic number of 40 and an atomic mass of 91. How many neutrons does it have? A. 40 B. 51 C. 91 D. 131

Pf3cl2 is a nonpolar molecule. based on this information, determine the f-p-f bond angle, the cl-p-cl bond angle, and the f-p-cl bond angle. enter the number of degrees of the f-p-f, cl-p-cl, and f-p-cl bond angles, separated by commas (e. g.

Which of the following bonds can form between atoms of equal electronegativity? (A) Ionic (B) Covalent (C) Hydrogen (D) Van der Waals

How many atoms of hydrogen are in 170 g of hydrogen peroxide (h2o2) ?

Often atoms join so that each atom will have a. an even number of electrons. b. an outermost energy level that is full of electrons. c. an equal number of protons and neutrons d. more electrons than either protons or neutrons

An aerosol can contains 800.0 mL of compressed gas at 10.2 atm pressure. When the gas is sprayed into a large plastic bag, the bag inflates to a volume of 4.14 L.

What is a example of a population

Which of the following statements holds true for a chemical change? OA In a chemical change, no new substance is formed. B. In a chemical change, a substance changes its phase. oc. In a chemical change, the molecular structure of a substance changes.

What is the name of the branch of science that specifically studies the conversion of chemical energy to electrical energy and vice versa? biochemistry electrochemistry organic chemistry thermodynamics

What is the symbol for heat

When a single 1-gram piece of zinc is added to 3 M hydrochloric acid at 25°C, the reaction is slow. Which procedure would most likely increase the rate of the reaction if the reaction were repeated? A. using 1 gram of powdered zinc B.