Which particles form the nucleus of an atom? a. protons and electrons b. protons and neutrons c. positrons and electrons d. positrons and neutrons

Identify each of the following solids as molecular, ionic, or atomic. Part A Br2 (s) molecular atomic ionic Part B AgCl (s) molecular ionic atomic Part C S (s) molecular ionic atomic Part D CH4 (s) atomic ionic molecular

Which statement describes a scientific theory? A. A theory states how something behaves without explaining why. B. A theory is a proven fact that cannot be changed. C. A theory changes based on new observations and testing. D.

Round 0.0952 km to 2 significant figures km 0.095 0.09 0.1

Which processes occur during the second stage of technological design? Check all that apply.

How many bromine atoms are present in 35.2 g of CH2Br2?

As energy transformations occur with in a system, the total energy of the system

In nucleophilic acyl substitution: Group of answer choices: A. an SN2 reaction occurs. B. protonation of the carbonyl is followed immediately by loss of the leaving group. C. ester hydrolysis is followed by deprotonation. D.

Find the number of atoms of arsenic in 28.62 moles of arsenic

Why is the R group in an amino acid important

Which of the following changes decreases the pressure in a gaseous system? a) decreasing the volume b) increasing the temperature c) increasing the number of gas molecules d) all of the above e) none of the above