Elements in the halogen group are

a. very reactive

b. have seven electrons in the outer shell

c. react to form salts

d. all of the above

If the half-life of C-14 is 5730 years, how much C-14 would be left from a 5000 year-old sample that started as 150 grams? N = No (1/2) t/T

Why Does A Candle Go Out When You Blow On It?

The atomic weight of hydrogen is 1.00794. a. True b. False

Fill in the blanks with the word that best completes each statement Scientists develop knowledge by making about the natural world that may lead to a scientific question A scientific question may lead to an) which can be tested.

What is the average kinetic energy of 1 mole of a gas at - 32 degrees Celsius? (R = 8.314 J/K-mol) 3.01 x 103 J -3.99 x 102 J 6.01 x 103 J 4.32 x 103 J

True or False: According to the present atomic theory, the location of an electron in an atom is best represented by a probability cloud.

How can we measure the density of different wooden objects

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic. True or False?

Which of the following equilibria would be impacted by a change in pressure? Select the correct answer below: H2 (g) + I2 (g) →2HI (g) NO (g) + O3 (g) →NO2 (g) + O2 (g) 2SO3 (g) →2SO2 (g) + O2 (g) CO (g) + H2O (g) →CO2 (g) + H2

A common stain remover is sold in concentrated form as 3M sodium hypochlorite (NaOCl). You need to create 400 milliliters of a 0.5M solution of sodium hypochlorite to fill a spray bottle. What volume of 3M sodium hypochlorite is needed? 15.0 mL 66.