When Mendeleev started his work on organizing the elements, about how many had

been discovered?

about 10

well over 100

about 60

the same as today

Fluorine, chlorine, bromine, and iodine are part of a family called what?

Which of the following describes a characteristic of water that makes it cohesive in nature? A: It is a non-polar molecule with weak hydrogen boding B: It has a linear molecular structure with H-O-H arranged in a straight line.

The coefficients in a balanced chemical equation represent (l) the mass ratios of the substances in the reaction (2) the mole ratios of the substances in the reaction (3) the total number of electrons in the reaction (4) the total number of elements

What is the density of a substance that weighs 100g and has a volume of 68cm3?

When you get into a car with hot black leather in the middle of the summer and it hurts your skin when you sit, this is an example of? Question 5 options: convection conduction radiation

You find a little bit (0.150g) of a chemical marked Tri-Nitro-Toluene, and upon combusting it in oxygen, collect 0.204 g of CO2 and 0.030 g H2O (we'll assume that these are the products, along with nitrogen).

What reaction occurs when two amino acids are put together?

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains of water at. During the reaction of heat flows out of the bath and into the flask. Calculate the new temperature of the water bath.

An aluminum can has a height of 4.83 inches, a diameter of 2.60 inches, and a uniform wall/end thickness of 0.0112 inches.

What is the mass of 2N at 0.2829 atm 1.35 L and 25°C