A scientist working in a lab wants to determine the approximate ph of a filtered biological solution using a visual test. which tool should the scientist use to measure ph?

1. How many moles are in 493.4 grams of calcium phosphide?

What is the total number of calories of heat energy absorbed by 15 grams of qater when it is heated from 30C to 40C?

A gas that exerts a pressure of 2.15 atm in a container with a volume of 0.0900 L will exert a pressure of ___ atm when transferred to a container with a volume of a 4.75 L

Undigested and unabsored materials from the small intestine pass into the

An alkali metal with fewer than 10 protons in its nucleus answer

how many grams of the excess reactant are left over when 4.43E-1 moles of Al (s) react with 1.29E+0 moles of Cl (g) ?
2Al (s) + 3Cl (g) → 2AlCl (s)

What do all ions have in common in terms of their electrical structure?

Identify the conjugate acid-base pair in this balanced equation: H2SO4 + 2NaOH → 2H2O + Na2SO4

You want to test how the mass of a reactant affects the speed of a reaction. Which of the following is an example of a controlled experiment to test this?

You are preparing some solutions for your instructor and have been asked to prepare 3.00 L of a 0.250M sodium hydroxide solution. To make the solution, you should weigh out: A. 30.0 g NaOH and add 3.00 L of water to it. B. 75.