Why is it necessary for the measuring devices to be clean

Several scientists from different countries are asked to examine the results of an experiment before a journal will print it.

The number of protons in one atom of an element is that element's A. Mass number. B. Balanced charge. C. Atomic number. D. Isotope.

Phenylacetic acid, HC8H7O2 is one of the substances that accumulates in the blood of persons with phenylketonuria, an inherited disorder that can cause death. A 0.085 M solution of HC8H7O2 is found to have a pH of 2.68.

What is the atomic number of silver

Cyclopropane, C3H6, is an anesthetic given by inhalation. How many grams are in 0.23 moles of cyclopropane? Express your the mass in grams to two significant figures.

The data below were collected for the following reaction at 500 ∘C: CH3CN (g) →CH3NC (g) Time (h) [CH3CN] (M) 0.0 1.000 5.0 0.794 10.0 0.631 15.0 0.501 20.0 0.398 25.0 0.

How do i convert 3.00 moles H2 to molecules?

How can you use the chemical formulas for sucrose (C6H, 20,) and rust (Fe, O,) to classity them ionic or molecular compounds?

What is true of energy as is passes through an ecosystem? a. All of the energy in an organism is used by the animal that eats it. b. Any stored energy in an organism is used by the animal that eats it. c.

Which can associate a suspect and the firing of a gun? (its not b) A) markings on the gun's exterior B) markings on the casing C) markings on the bullet D) powder residues