Um automóveu se desioca de são paulo às 10 horas e chega ao rio de janeiro às 17 horas depois de percorrer 420 km. Qual foi a velocidade escala média desse automóvel?

Two or more forms of an element are called

How many aluminum atoms are in 2.58 grams of aluminum

What quantity is a scalar quantity?

What are the reactants and products of cellular respiration and photosynthesis?

In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred

Which of the following is an example of a molecule? F C Al O2

Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled.

Research about the reaction of baking soda and vinegar

What mass (in mg) does 2.63 moles of nickel have? 3.56 * 105 mg 1.54 * 105 mg 2.23 * 104 mg 129 mg?

Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.