A weather balloon at Earth's surface has a volume of 3.9 L at 299 K and 763 mmHg. If the balloon is released and the volume reaches 4.13 L at 720 mmHg, what is the temperature? Answer in units of K.

Answer the following questions based on zinc. 1. What mass of copper would have a volume of 35.15 cm3? 2. What volume would 71.45g of copper shot occupy? 3. If 50.0 cm3 of one type of metal has a mass of 352 g, is this metal copper? Explain.

What are reasons standardizing conditions in which chemist describe matter?

Which of the following is necessary to determine the rate of a reaction using the rate law? A. The starting temperature of the reaction B. The activation energy of the reaction C. The concentrations of the reactants D.

What is true about cellular respiration? Cellular respiration is an exothermic physical change. Cellular respiration is an endothermic physical change. Cellular respiration is an exothermic chemical reaction.

The mass of the average car is about 1800 kilograms. Express this number in scientific notation. Select one: a. 18 x 102 kg b. 1.8 x 103 kg c. 18 x 10-2 kg d. 1.8 x 10-3 kg

2. An automobile tire has a pressure of 210 kPa at 293 K. What will be the tire pressure after driving, if the tire temperature rises to 308 K?

Students measuring the mass of a rock record 6.759 g, 6.786 g, 6.812 g, and 6.779 g. Which other measurement of the block's mass would be most precise? A. 6.702 g B. 6.781 g C. 6.605 g D. 6.858 g

What two elements make up dihydrogen monoxide?

What did scientists observe using the earliest microscopes

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.