Star A has a magnitude of 2. Star B has a magnitude of 5. What is the brightness ratio? A. 6.3 : 1 B. 15.8 : 1 C. 5 : 2 D. 2 : 5

Which type of element typically loses an electron to become an ion? a. gas b. metal c. nonmetal d. semimetal

Why will the offspring have traits of both the mother and father

If the CaCO3 weighed 983 g and the CaO weighed 551 g, how many grams of CO2 were formed in the reaction?

When is the velocity of an object constant? A) when only its speed changes B) when only its direction changes C) when its speed and its direction both change D) when neither its speed nor its direction change

The elements located in the first column, or group, in the periodic table all share a similar electron configuration. If the atom is neutral, how many electrons are found in the outermost shell of each of these elements? A=1 B=2 C=3 D=4

A student has a solution with a pH of 7. The student adds HF, hydrogen floride, to the solution, hoping to increases the pH of the solution. What is wrong with this student's approach? Select one: A. You cannot change the pH of a solution. B.

What is more likely to happen if wetlands are drained?

A) If you weigh a hydrated compound before and after heating it. Do you expect the mass to be more or less than before heating? Explain why. b) How about if you weigh a bag of popcorn before and after heating it.

Define the term relative molecular mass

It took many of the metals several minutes to begin to react. Once the reaction was initiated, several of these metals continued to react quite vigorously.