The andromeda galaxy is located approximate 2.5 million light-years from earth. Why is the light that Reaches earth 2.5 million years old

Which of the following equations is balanced correctly and has the correct products for the reactants RbNO3 and BeF2?

What fact about other seasons most surprised you and what did you find the most interesting why

Consider an ice cube with a volume of 0.50 cup. (1 cup = 240.0 mL, density of ice = 0.9167 g/mL). How many water molecules (molar mass = 18.015 g/mol) are present in this ice cube?

Which of the following are weak electrolytes in aqueous solutions? Select ALL that apply. Group of answer choices HgCl2 LiOH HClO4 NH3 HI

Erica is competing in the shot put event at a track meet. She hurls a shot with a mass of 4 kilograms at a speed of 9 meters/second. The shot's kinetic energy is joules.

If you were traveling through space and landed on a different planet, how might your mass and weight compare to their values on Earth? Why?

Which principle explains why it is necessary to have safety belts in cars?

Hydrochloric acid is purchased in 12 molar concentrations. If I needed 200 ml of 2.0 molar HCl, how many milliliters of the concentrated solution would I need

Which of the following represents a chemical change? Bending a wire Freezing of water Fireworks exploding Melting of a wax candle

5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure? A. 400 °C B. 127 °C C. 223 °C D. 627°C