30
(b) the student uses her results to calculate the enthalpy change
for dissolving potassium hydroxide in water.
she compares her value with a data book value.
student's value = - 32kj/mol. o
data book value = - 55kj/mol.
there are no errors in the student's method or in the calculation.
suggest two reasons why the student's value differs from the data
book value. (2)

Balance and in which category does it fit in? single or double displacement or synthesis or decomposition? (a) k2 o → k + o2 (b) na + i2 → nai (c) cu(no3 )2 + naoh → cu(oh)2 + nano3 (d) kclo3 → kcl + o2 (e) ca(no3 )2 + hbr → cabr2 + hno3 (f) sn(oh)2 → sno + h2 o (g) p4 + n2 o → p4 o6 + n2 (h) fe + al2 (so4 )3 → feso4 + al (i) alcl3 + na2 co3 → al2 (co3 )3 + nacl (j) c3 h6 + o2 → co2 + h2 o

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

Which method would be best to separate a mixture of sand and gravel