True or false when an object is placed in water, the water level falls

The following balanced equation shows the formation of ethane (C2H6). C2H2 + 2H2 - C2H6 How many moles of hydrogen are needed to produce 13.78 mol of ethane? 3,445 mol 6.890 mol 27.56 mol 55.12 mol

A mixture of NaBrO 3, NaBrO3, NaHCO 3, NaHCO3, Na 2 CO 3, Na2CO3, and NaBr NaBr was heated, producing H 2 O, H2O, CO 2, CO2, and O 2 O2 gases by the following equations.

How does the ionic radius of a nonmetal compare with its atomic radius? Explain the change in radius. Explain why atomic radii decrease as you move from left to right across a period. Which element has the larger ionization energy? Li, NKr, NeCs, Li

Which phenomena naturally warms earth lower atmosphere and surface?

When comparing elements in the same column of the periodic table, which factor - distance or the number of protons seems to be the dominant factor?

Alkanes, alkenes, and alkynes are examples of A. aliphatic compounds B. aromatic compounds C. carcinogens

How many molecules of molecular oxygen react with four molecules of NH3 to form four molecules of nitrogen monoxide and six molecules of water?

Element X has an electron configuration that ends with 5p6. Which of the following describes this atom correctly? a. unstable metal b. noble gas c. alkali metal d. unstable nonmetal

If 12.1 kilograms of al2o3 (s), 60.4 kilograms of naoh (l), and 60.4 kilograms of hf (g) react completely, how many kilograms of cryolite will be produced?

A certain ionic compound X has a solubility in water of 40.3 g/L at 20. degrees C. Calculate the mass X of required to prepare 500. mL of a saturated solution of X in water at this temperature.