What is true if mass is conserved in a reaction

(a) there are more atoms on the reactants side

(b) there are equal number of atoms on both sides

(c) there are more atoms on the products side

(d) the number of atoms on each side change

What volume of a concentrated hcl solution, which is 36.0% hcl by mass and has a density of 1.179 g/ml, should you use to make 8.00 l of an hcl solution with a ph of 1.500?

H2o+co2=c6h12o6+o2 balance

A gas has a volume of 50.0 cm3 at a temperature of - 73°c. what volume would the gas occupy at a temperature of - 123°c if the pressure stays constant?

Be sure to answer all parts. consider the combustion of butane gas: c4h10 (g) + 13 2 o2 (g) → 4co2 (g) + 5h2o (g) (a) predict the signs of δs o and δh o. δs o : negative positive δh o : negative positive (b) calculate δg o at 298 k. kj

Elements are organized into groups / families according to their physical and chemical properties. Identify the elements that's belong to each family based on there number of valence electrons. Write the names and symbol for each element

With respect to composition, how is the compound made from hydrogen and oxygen different from mixtures of these two elements?

How should scientist respond when new evidence that challenges current is presented?

Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of H2. D2 (g) + H2 (g) ⇌ 2 HD (g) Kp = 1.80 P (D2) eq = 1.1 * 10-3 atm P (HD) eq = 2.7 * 10-3 atm

Find δe for the change in state of 1.0 molh2o (l) at 79 ∘c to h2o (g) at 116 ∘c. the heat capacity of h2o (l) = 75.3 j/molk, heat capacity of h2o (g) = 25.0 j/molk, and the heat of vaporization of h2o is 40.7*103j/mol at 100 ∘c.

Balloon A started with a volume of 1.76 L. The temperature of the room the balloon was in was 295 K. The balloon was heated to a temperature of 253.15 K. What is the new volume?