A train travels 99 km in two hours and then 72 km in two hours what is it's average speed

Calcula la densidad de un cuerpo que tiene la masa de 12g y un volumen de 3cm^3 dar el resultado en unidades del SI por favor ayuda

A blank is a special kind of mixture in which one substance is uniformly mixed into another

All of the elements in a family or group have similar chemical properties. which of the following statements best explains why this is true? a. the elements in a group have the same number of protons in their nuclei. b.

What is the role of an enzyme? a. speeds up biochemical reactions b. causes biochemical reactions c. is a product in biochemical reactions d. provides extra heat for biochemical reactions

Builders and dentists must store plaster of Paris, CaSO4 x 1/2 H2O, in airtight containers to prevent it from absorbing water vapor from the air and changing to gypsum, CaSO4 x 2H2O How many liters of water vapor evolve when 2.

Write the mathematical expression that allows you to solve for the oh - concentration in water when you know only the h3o + concentration.

The role gravity played in the formation of the sun?

What kind of reaction occurs when you mix aqueous solutions of barium sulfide and sulfuric acid?

What is true about empathy? Most anyone can learn this skill. Not everyone can learn this skill. It is a desirable attribute. choices A and C

What effect can new observations have on a scientific theory