What must be part of a quantitative observation?

a change of state

a change in size

a number

a color

What is the stationary phase in chromatography? Like what is it?

How is a chemical reaction different from a physical reaction

Cocaine and amphetamines are both classified as

What is the mass in grams of 3.0x10^23 molecules of carbon dioxide?

You notice that a chemical reaction in your system is happening at a slow rate. you want to speed up the reaction. what do you do?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?

Amalgam is an alloy that contains mercury and other metals. Which of these atoms would most likely form metallic bonds with mercury? Check all that apply. bromine copper hydrogen iodine silver tin