Are iron filings a pure substance?

How many molecules of carbon dioxide are in 95 grams of carbon dioxide (co2) ?

Which of the following is not equal to 63 meters? 0.063 km 0.63 dkm 6,300 cm 63,000 mm

Mrs. Smith is demonstrating a chemical change for her class. She places 15 grams of baking soda into a beaker. Next she adds 15 grams of vinegar to the same beaker. When the two compounds make contact, they bubble and fizz a great deal.

The half-life of a radioactive kind of strontium is 3 hours. If you start with 64 grams of it, how much will be left after 9 hours?

What does condensation mean in the water cycle?

Why does the amount of energy available change as you move from one trophic level to the next?

What type of bond holds metal atoms together?

Imagine you are purifying a protein which accounts for 0.001% of the total protein within a cell. how many steps of purification are required to yield pure protein, assuming a 10 fold purification with each step of purification?

If an object has the mass of 109.67 g and a volume of 16.99 cm3 what's its density

Astrology is pseudoscience. What can you conclude about the claims made by astrology