Write this number to two significant figures in scientific notation. Use the "^" character to indicate the exponent. 4.253

1. A pyrotechnician mixes 280 g of black powder for a firework. Find the amount of oxygen, carbon dioxide, and sulfur dioxide generated when this firework bursts, if the oxidizing agent in the powder is saltpeter. 2.

Is pencil lead a element compound, heterogeneous, mixture, or solution?

Explain how a graphical analysis can be used to explore the relationship between any two scientific variables.

A chemical reaction that has the general formula of nA> (A) n is best classified as a? Reaction

Which of the following pieces of glassware would be best to choose for the following tasks? For each task, select either the volumetric flask, Erlenmeyer flask, beaker, volumetric pipet, or graduate cylinder and explain why it would be the best

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