Elena weighed out 50 grams of salt. She dissolved the salt in 285 grams of water. After she added salt the water had 335 grams of weight. How did the addition of the salt affect the final mass and volume of the mixture?

What physical property would be the most useful in the separation of very fine saw dust and salt?

How many atoms are there in 1.00 mole of KNO3? a. 1 atom b. 3.01 x 10^24 atoms c. 6.022 x 10^23 atoms d. 5 atoms

If 4 moles of gas are added to a container that already holds one mole of

If an atom has 11 protons and 13 neutrons what is it's atomic number

Which statement is true? Postively charged objects attract other positively charged objects negatively charged objects attract other negatively charged objects

Thorium-229 is a highly radioactive isotope. Use the chart to determine the half-life of Th-229. A) 7,340 years B) 8 years C) 16 years D) 22,020 years

Which of the following is true about a municipal bond with a put option? (A) An investor will exercise the option to put the bond if yields rise significantly. (B) An investor must have the issuer's permission to put the bond.

A certain ore is 37.3% nickel by mass how many kilograms of this ore would you need to dig up to have 10.0g of nickel

What would be the change in pressure in a sealed 10.0 L vessel due to the formation of N2 gas when the ammonium nitrite in 1.00 L of 0.500 M NH4NO2 decomposes at 25.0°C?

Read the given equation. Na2O2 + CO2 → Na2CO3 + O2 What volume of O2 gas is produced from 2.80 liters of CO2 at STP?