When calculating the density of a liquid you measure 8.2 ml in a graduated cylinder with markings every 1 ml and measure the mass on a balance 9.548g. what is the density of this liquid with significant figures?

Is " Energy created " an Endothermic reaction or an Exothermic reaction?

Which of the following processes is exothermic (heat or energy is released) ? A) ice melting in a beverage B) dry ice (solid CO2) converting to a gas at room temperature C) evaporation of water from a mud puddle D) burning propane in a barbeque

23. Explain why children often look like their parents.

What is the chemical symbol for magnesium?

How many grams of O2 are needed to produce 0.400 mole Fe2O3 in the following reaction? 4 Fe (s) + 3 028 2 Fe2O3 (s)

Why is photosynthesis so important to plants, and can't animals use it?

One way the government of Kim Jong-il controls the lives of the people who live in North Korea is by a. requiring every citizen to vote. b. controlling information its people receive from the outside world. c. enforcing free trade with other nations.

Give reasons 1) copper utensils and sheets become blackish after some days

Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs for? H and? S (for the system).

At 29°C, Kp = 5.3 ✕ 102 atm-2 for the following reaction. N2 (g) + 3 H2 (g) equilibrium reaction arrow 2 NH3 (g) When a certain partial pressure of NH3 (g) is put into an otherwise empty rigid vessel at 29°C, equilibrium is reached when 55.