Why does a hot air balloon rise when the air inside it is heated

A sample of metal has a mass of 24.08g, and a volume of 6.25ml. What is the density of this metal

Many ionic and covalent compounds dissolve well in water

Convert the following numbers into Scientific Notation 1) 3.400 2) 0.000023 3) 101,000 4) 0.010 5) 45.01 6) 1,000,000 7) 0.00671 8) 4.50

Which of following materials is the poorest thermal conductor answers A. Neon gas B. water C. Plastic D. Steel

Asbestos is most often associated with which medical condition?

2A balloon filled with helium occupies 20.0 L at 1.50 atm and 25°C. How many moles of helium will there be in the balloon at STP? A. 22.4 moles B. 1.12 moles C. 0.0446 moles D. 0.893 moles E. 1.23 moles F. 4.55 moles

1. Which has a larger radius Ca atom or Ca+2 ion? 2. Which has a greater radius F atom or F - ion? 3. Which is the correct way of understanding the trend for Ionic radius Vs. Atomic radius?

For which of the following activities might you want to hire a chemist? A. examining the structure of plant cells B. building a fence C. building a wood storage shed D.

How do I build natural testosterone

Andrea is performing an experiment in which she needs to know when a strong acid is present. She is not sure which indicator to use, so she looks up the following table in her science textbook. Indicator pH range thymol Blue 1.2 - 2.8 phenol Red 6.