Which of the following correctly represents an exothermic reaction? a making ice cubes b a candle flame c burning sugar d all are examples of exothermic reactions

Which of the following is a way earths water is directly affected by pollution emissions from cars toxic run off farms dumping trash on the road side production of oxygen by trees

If you have 20 grams of parent material, and one half-life goes by, how much parent material do you have remaining?

Why chalk and water can not mix

How many valence electrons does oxygen have? A. 2 B. 6 C. 8 D. 16

A car traveled 30 km in 1 hour, 40 km in the next 1 hour, and then 30 km in 2 hours before reaching its destination.

How is radiation different from convention and conduction?

What is a mutual attraction between the nuclei and electrons in two different atoms called? A) a chemical bond B) a compound C) a cation D) a anion

elements on the right side of the periodic table differ from the elements on the left side in that elements on the right side

The empirical formula of glucose is CH2O the molecular formula of glucose is 6 times than the empirical formula. what is the molecular formula of glucose?

A compound with molecular formula C6H15N exhibits a singlet at d 0.9 (1H), a triplet at d 1.10 (3H), a singlet at d1.15 (9H), and a quartet at d 2.6 (2H) in its 1HNMR spectrum. Its IR spectrum shows one medium absorption band near 3400 cm-1.