What can block light by placing obstacles in this path, but it much more difficult to block sound why

How many moles of N2 is 224 L of N2?

Convert each of the following measures in length 1.1cm to meters

Take CuSO4, add enough to create a 0.5 Molar Solution in the ½ liter of water originally in the beaker. (It is fine if the concentration is slightly more or less than 0.5 M, make sure to record the observed concentration). Required: a.

Why is the inside of earth so hot?

What do you understand by shared pair of electron

Which of the following is the best description of covalent bonding? 1. Bonding that occurs between elements with similar electronegativities, and with transfer of electrons. 2.

You are asked to smell a solution in a beaker. what is the best way of doing this?

The specific gravity of iron is 7.87, and the density of water at 4.00 ∘C is 1.00 g/cm3. You can use this information to find the density of iron. Find the volume occupied by 4.50 g of iron.

The volume of a gas is 93 ml when the temperature is 91? c. if the temperature is reduced to 0? c without changing the pressure, what is the new volume of the gas?

15.434 g of kcl (m. m 74.55 g/mol) is dissolved in water up t a total volume of 500.0 mL. the density of this solution is 1.02 g/mL. what is the concentration of he solution in molality