Which type of property of matter can be observed without changing the composition of the substance? Question 1 options: chemical properties reversible properties physical properties irreversible properties

The atomic mass of silicon is approximately 28.055. Which of the following would indicate the number closest to 28.055? 1. atomic number 2. mass number 3. number of electrons + neutrons 4. number of protons + electrons

The limiting reactant determines what the actual yield is. (T/F)

What happens when an atom has more electrons that can fit in one energy level

Which neutral atom is isoelectronic with o+?

What are alkenes used to make?

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from

What classification should this reaction have? 4Al + 3O2 → 2Al2O3

If you start with 100 grams of a radionuclide, how much will you have after two half-lives have passed?

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?