Our bodies are penetrated by x-rays but not by visible light. Is this because x-rays travel faster than visible light? Yes or no?

How many joules are needed to change the temperature of 100. g of water from 20 to 45

Which of the following statements a about scientific hypothesis is false? a. A hypothesis should be created when the outcome for its test is known. b. A scientific hypothesis is an educated guess about why something happens. c.

The density of a substance with a mass of 40.0g and a volume of 10ml is?

Choose all the answers that apply. Which of the following are general characteristics of animals? they are mobile they have nervous systems they are heterotrophs they have specialized tissue they have spinal cords

What does the law of conservation of mass state? Mass can be destroyed but not created during a chemical reaction. Mass can be created but not destroyed in a chemical reaction.

Consider n2 (g) + 3h2 (g) →→ 2nh3 (g). what is the mass of nitrogen gas required to react with 0.129 g h2?

Write a sentence that uses the words "mass extinction" correctly

Which description is not a property of an acid? A turns litmus paper red B bitter taste C corrosive D dissolve metals

Concerning the 10.0 mL of 0.50 M NaCl diluted to 100 mL of solution: When a solution is diluted, does the dilution change the number of grams dissolved? yes no

What causes element name to change