At do oxygen (O) and bromine (Br) have in common? They both tend to gain electrons to gain stability. They both have seven valence electrons. They are both halogens. They are both unreactive.

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

Make a chart comparing protons, neutrons, and electrons. Include their mass, location, and electrical charge.

Which best describes a force? a vector with magnitude and direction a vector with speed and strength a vector with direction only a vector with strength only Mark this and retum Save and Exit Next Submit

Which of the following is an acid-base neutralization reaction? A. Sn+2HBr-->SnBr2+H2 B. HCL+KOH---> KCL+H2O C. 2AlCl3 + 3Ca (OH) 2--> 2Al (OH) 3 + 3CaCl2 D. 2C2H6+7O2-->4CO2 + 6H2O

Consider a process in which 100 kJ of energy is transferred reversibly and isothermally as heat to a large block of copper. Calculate the change in entropy of the block if the process takes place at (i) 0 °C, (ii) 50 °C.

How much heat is needed to raise the temperature of 75 g of a substance by 15 C when the specific heat is 0.92 J/g-C?

A nitric acid solution flows at a constant rate of 5L/min into a large tank that initially held 200L of a 0.5% nitric acid solution. The solution inside the tank is kept well stirred and flows out of the tank at a rate of 10L/min.

How many molecules are in 237g (about a cup of water)

3. A compound was analyzed and found to contain 9.8 g of nitrogen, 0.70 g of hydrogen, and 33.6 g of oxygen. What is the empirical formula of the compound?

A 126-gram sample of titanium metal is heated from 20.0°C to 45.4°C while absorbing 1.68 kJ of heat. What is the specific heat of titanium?