The element silver has both physical and chemical properties, some of which do not change when the size of the sample changes. Which of these choices is a physical property that does not change when the size of the sample changes?

What is the mass in grams of 4.90 x 10^12 lead (Pb) atoms? Be sure your answer has the correct number of significant figures

State the number of protons in Ag^+. Express your answer as an integer.   State the number of electrons in Ag^+. Express your answer as an integer.

Please answer question 17 Part A

A nutrition table lists apples with a potassium content of 4600 mg/pound. Assume an average apple is 75.0 g, the minimum daily intake for potassium for a healthy adult is 3500. mg per day. Calculate the number of apples per day to meet this requirement for a healthy adult. Assume 454 g = 1 pound. O 7.96 apples per day O 0.126 apples per day O 0.217 apples per day O 4.61 apples per day

During an exam a student broke into a sweat and 4.23x1022 water molecules erupted on their forehead. How many drops of water is this? Assume one drop of water is 50.0 microliters and the density of water is 0.997g/mL? Use these atomic masses: H = 1.008 amu; O = 15.999 amu Not these answers:  0.07 25 25.38

The mass of an average neon atom is 20.2 atomic mass units. One atomic mass unit is equal to 1.66x10-24g. What is the mass in grams of 20 neon atoms?

Crime scene investigators keep a wide variety of compounds on hand to help with identifying unknown substances they find in the course of their duties. One such investigator, while reorganizing their shelves, has mixed up several small vials and is unsure about the identity of a certain powder. Elemental analysis of the compound reveals that it is 67.31 % carbon, 6.978% hydrogen, 4.617% nitrogen, and 21.10% oxygen by mass.     Which of the compounds could the powder be? C17H19NO3C17H19NO3 = morphine, analgesic C17H21NO4C17H21NO4 = cocaine, illicit drug C7H5N3O6C7H5N3O6 = 2,4,6-trinitrotoluene (TNT), commonly used explosive C10H15NC10H15N = methamphetamine, stimulant C4H5N2OC4H5N2O = caffeine, stimulant C11H15NO2C11H15NO2 = 3,4-methylenedioxymethamphetamine (MDMA), illicit drug C21H23NO5C21H23NO5 = heroin, illicit drug C3H6NO3C3H6NO3 = hexamethylene triperoxide diamine (HMTD), commonly used explosive

Write the acidic equilibrium equation for CSHSNH.

Are the physical properties of a substance, such as color, sufficient to identify the substance? Why or why not?