Protons and neutrons are composed of

quarks

molecules

ions

electrons

How is box of crayons both homogenous and heterogeneous?

Consider the reaction, C2H4 (g) + H2 (g) - C2H6 (8), where AH = - 137 kJ. How many kilojoules are released when 3.5 mol of CH4 reacts? 480 kJ are released 20 x 103 kJ are released 570 kJ are released 137 kJ are released

Where would you find the element with the least mass in the periodic table? A. Period 1, group 18 B. Period 7, group 1 C. Period 3, group 2 D. Period 1, group 1

Which type of force will an object move towards? O weakest O balanced O strongest O net

How do you know if a substance is polar or no polar

Rubbing alcohol contains 615g of isopropanol (C3H7OH) per liter (aqueous solution). Calculate the molality of this solution. Given density of rubbing alcohol solution is 0.825 g/cm3 at 22 oC.

Round off the measurement to three significant figures 12.17º C

Arrange the following aqueous solutions, all at 25 ∘C, in order of decreasing acidity. Rank from most acidic to most basic. To rank items as equivalent, overlap them.

What is the pH of a 9.50*10-2 M ammonia solution?

Find the final equilibrium temperature when a 10.0 g of milk at 10.0c is added to 1.60 x 10^2 g of coffee with a temperature of 90.0 c