Write the symbol for the ion formed when each element gains electrons and attains a noble-gas electron configuration. Br, H, Se.

Consider the exothermic reaction 4HCl (g) + O2 (g) ⇋ 2Cl2 (g) + 2H2O (g). Which of the following should cause the equilibrium to shift right to form more Cl2 gas?

a piece of metal is heated to 100℃ and placed into 75.0g of water in a coffee-cup calorimeter. Initially, the temperature of the water in the calorimeter was 23.1℃. The final temperature of he system was 30.6℃.

Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow.

34 What is the gram-formula mass of Fe (NO3) 3? (1) 146 g/mol (3) 214 g/mol (2) 194 g/mol (4) 242 g/mol

The atoms of the compound methylhydrazine, ch6n2 which is used as a rocket propellant, are connected as follows: the structural formula of methylhydrazine what do you predict for the ideal values of the c-n-n and h-n-h angles, respectively?

The molality of a solution is a measure of - A - moles of solute per kilogram of solution B - moles of solute per liter of solution C - moles of solute per kilogram of solvent D - moles of solute per liter of solvent

Which technology has allowed for exploration beyond our solar system? A) space probe B) space station C) space shuttle D) space observatory

Which carbonate is most stable to heat? A. Sodium carbonate B. Copper (ii) carbonate C. Zinc carbonate

How many liters of 0.75 M solution can be made using. 336 moles of lead (II) oxide?

Which molecule, when added to a solution, would give the solution the highest ph? A. HCI B. H2SO4 C. KOH D. H2O