Big question for physicists out there:How can we be sure dark matter actually exists in our universe?

Which of the following statements about the greenhouse effect is false? A) Greenhouse gases include carbon dioxide, chlorofluorocarbons, and methane. B) Some of the heat from the sun's light is absorbed.

What is the relationship between the atomic numbers and ionic radii of the elements in the group 7a

Which reaction follows the law of conservation of matter?

What types of atoms generally form anions?

Which element is less electronegative than barium

Tear gas has the composition 40.25% carbon, 6.19% hydrogen, 8.94% oxygen, 44.62% bromine. what is the empirical formula of this compound?

Explain why ships traveling from east to west across the Atlantic take days longer than ships traveling the same distance from west to east.

In a titration 25.0 ml of a. 20 M NaOH solution is used to neutralize 10.0 ml of HCl. Write the equation for this neutralization reaction and calculate the molarity of the acid.

4*C: 4cm 8*C: 10cm 12*C: 14cm 16*C: 18cm 20*C:24cm 24*C: 12cm what is the independent variable, dependent variable and three constant variables?

In the chemical laboratory, why do scientists use a mortar and pestle? a. to increase surface area of a solute b. to decrease surface area of a solute c. to increase temperature of a solute d. to decrease temperature of a solute