How many atoms are in (NH4) 2CR2O7

Student follow up 1 The ionic equation for the reaction between zinc and sulfuric acid is: Zn (s) + 2H + (aq) - Zn?" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

A chemical reaction that gives off heat is most likely to be

NF3 Spell out the full name of the compound.

Which criteria determine whether a heterogeneous mixture is a colloid or a suspension? a) whether its composition is uniform and transparent b) whether the particles do not settle for an extended period of time c) whether the ratio of components is

The bond enthalpy in no is 632 kj/mol and that of each no bond in no2 is 469 kj/mol. explain the difference in bond enthalpies between the two molecules. 1. the bond type does not explain the difference. 2. no has a singl

Determine the number of moles in a container of gas at STP with a volume of 99.2L

State the number of significant 2804

For the reaction 2N 2O (g) ⇌ O 2 (g) + 2N 2 (g), what happens to the equilibrium position if the pressure increases?

A chemistry student needs 90.0g of glycerol for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of glycerol is 1.26·gcm-3. calculate the volume of glycerol the student should pour out.

A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3. Calculate (a) the mass percentage, (b) the mole fraction, (c) the molality, (d) the molarity of H2SO4 in this solution.