How are atoms and elements related?

ES How many milliliters of water should be added to 50.0 mL of a 1.0 M CaBr2 solution to create a 0.25 M solution?

Consider that you collect hydrogen gas over water in an upside-down test tube. If the atmospheric pressure is 1.00, which of the following statements are true? Select all that apply. A.

A pure substance made of one kind of atom

If a total distance of 750 m is covered in a time interval of 25 s, the average speed is? 3, 974 mph 3 mph 30 mph 30 m/s

Pure oxygen gas was first prepared by heating mercury (ii) oxide, hgo: 2hgo (s) →2hg (l) + o2 (g) what volume (in l) of oxygen at stp is released by heating 10.36 g of hgo?

True or false: for genetic engineering the specific traits of a given organism are located on the DNA sequence of the chromosomes are genes

A container with a volume of 3.46 liters contains a gas at a pressure of 1.30 atmospheres and a temperature of 274.27 Kelvins. How many moles of gas are in the container?

Benzene, C6H8, has an enthalpy of fusion = 10.19 kJ/mol. Calculate the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C?

What is the H3O + ion concentration of a solution that has an OH - ion concentration of 1.0 * 10^-3M? A) 1.0 * 10^-3M B) 1.0 * 10^-7M C) 1.0 * 10^-11M D) 1.0 * 10^-14M

Given the following chemical reaction: 2 O2 + CH4 CO2 + 2 H2O In the reaction of 6 moles of CH4 with excess oxygen, how many moles of water could be produced? 6 C 12.01 Carbon 1 H 1.01 Hydrogen 8 O 16.00 Oxygen A. 4 B. 6 C. 8 D. 12