The table shows four reactions. Reactions
Reaction Equation
1 C3H8 + 5O2 → 3CO2 + 4H2O
2 C2H4 + H2 → C2H6
3 AgNO3 + NaCl → AgCl + NaNO3
4 2Fe + O2 → 2FeO

Which of the above reactions is an example of combustion of an organic substance? (5 points)
1
2
3
4

This line graph compares the growth of plants that were kept in the sun for different amounts of time.a)  on day 7, the plants kept in the sun for 3 hours were how tall? b)  on day 7, the plants kept in the sun for 6 hours were how tall? c)    on day 10, the plants kept in the sun for 9 hours were how tall? d)  on day 11, the plant that was grown with 1 hour of sunlight was how tall? e)  based on the graph, the plant grows best in what amount of sunlight?

For each of the following mixtures decide if filtering would be suitable to separate the substances. explain your answers. oil in water sugar in water sand in water chalk in water tea leaves in a cup of tea

Which fact represents evidence for the big bang theory?