A chemistry instructor provides each student with 8 test tubes at the beginning of the year. If there are 28 students per class, how many test tubes are required for three chemistry classes?

Which two notations represent isotopes of the same element

Explain the laws of thermodynamics and why they matter.

Elements cannot be seen with the eye. True False

What is the chemical symbol for nitrogen? A) N B) Ni C) Na D) Ne

Newton's second law of motion is F=ma A net force of 60 N north acts on an object with a of 30 kg. Use Newton's second law of motion to calculate the amount of acceleration the object will experience.

Why is it possible to safely drink a solution that contains a 50:50 mixture of equal concentrations of a strong acid and a strong base, either of which, if ingested separately, would be very caustic and damaging?

Explain why many compounds that contain one or more hydrogen atoms are not classified as arrhenius acids

pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or a compound? give reasons

What amount (moles) is represented by each of these samples? a. 20.0 mg caffeine, c8h10n4o2 b. 2.72 1021 mo?

A sample of gas occupies 40.0 mL at - 123°C. What volume does the sample occupy at 27°C if the pressure is held constant? V1T2 = V2T1 Don't forget to convert temperature to kelvin! Group of answer choices 8.80 mL 20.0 mL 80. ML 182 mL