If a plant with purple petals (pp) is crossed with a plant with white petals (pp), what is the phenotype for the f1 generation? purple petals white petals a combination of purple and white petals

The genotype for the F1 generation is PURPLE PETALS.
In cross breeding, the offspring of the original generation in a cross are called F1 generation. When two breeding of a particular living organisms are crossed, then the F1 generation will be all the same.

All of the offspring will be heterozygous, meaning they'll have both a P and p allele (Pp), and all will display the dominant allele, P, meaning they will all have purple petals. 

The phenotype for the F1 generation, therefore, is purple petals

Heatamount of salt . . .

Sugar + oxygen > carbon  dioxide + water + energy  c6h1206 + 6o2 > 6co2 +6h2o + energy  and the numbers after the element symbols are small.