Name three changes of state that can take place when energy is removed from a substance

What kind of flower would attract a hummingbird?

Is water wet? Sounds like a silly question, but would be cool to know.

Both the freezing temperature and the melting temperature of water are the same (0°C). Explain why a substance like water freezes and melts at the same temperature.

It is generally considered that dinosaurs live in warm climates, yet fossils remains are found in antartica. How can that be explained

Suspect A is actually telling the truth and they describe the events of a certain evening with confidence. After being asked to do so, suspect A then retells the events of the same evening in the reverse order.

A scientist in London and a scientist in California both conducted independent investigations that produced similar results.

When magnesium combines with oxygen, the reaction involves a. a conversion of protons into electrons. b. sharing of electrons between Mg and O. c. transfer of electrons from Mg to O. d. transfer of electrons from O to Mg.

The activation energy for the reaction no2 (g) + co (g) ⟶no (g) + co2 (g) is ea = 100 kj/mol and the change in enthalpy for the reaction is δh = - 375 kj/mol.

What process transform solar energy into chemical energy?

When the reaction was carried out the calculated theoretical yield for water was 176 grams but the measured yield was 148 grams what is the percent yield