A sound wave has a frequency of 425Hz what is the period of this wave

Consider the balanced equation below. 4NH3 + 302 → 2N2 + 6H20 What is the mole ratio of NH3 to N2? A) 2:4 B) 4:2 C) 4:4 D) 7:2

You hear a weather forecaster predict thunderstorms. Which kind of clouds would likely be in the sky? cirrus nimbostratus cumulus cumulonimbus

Gasoline has a density of 0.69g/cm cubed. Calculate the mass of a litre of gasoline.

What is a simple experiment that you could conduct to test your hypothesis?

If 1.0 mole of CH4 and 2.0 moles of Cl2 are used in the reaction CH4 + 4Cl2 = > CCl4 + 4HCl then which of these statements is TRUE? A. All of the CH4 will be used up. B. The theoretical yield of CCl4 is 1.0 mole. C. Some Cl2 will be left over. D.

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.

Which represents the balanced nuclear equation for the beta plus decay of C-11? Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 5 upper B plus superscript 0 subscript plus 1 e.