Which of the following indicates that an endothermic reaction has taken place?
A) cooling of the surroundings
B) release of heat and light energy
C) a loud explosion
D) a change in color

How many grams of n2h4 will be consumed by 23 g of n2o4

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

What is the chemical formula for the compound formed between sodium and flour one