If an atom contains 11 protons and 12 neutrons, what is its atomic number?

A chemical or physical change that releases heat into its surroundings is ... A. An exothermic process B. melting ice C. endothermic process D. A phase change

The electronic configuration of an element is given below. 1s22s22p63s1 Which statement about the reactivity of the element is true? It is reactive because it has a full outermost energy level.

A particular device uses electromagnetism by using electricity to move magnets. The magnets in this device are then used to do work. Which device uses electromagnetism in this way?

How can a scientific law be expressed as a mathematical equation?

What are observations that indicate a chemical change has occurred?

Isopropyl alcohol (C3H8O) is a common solvent used for cleaning and disinfectant purposes. Its mass spectrum is shown below.

How is an unsaturated fat converted to into a saturated fat?

Is hydrofluoric acid stronger than acetic acid?

How much energy does an electric hair dryer use if it draws 8.3 amps of current when using 120 volts for 5.0 minutes?

You need a 45% alcohol solution. on hand, you have a 480 ml of a 40% alcohol mixture. you also have 85% alcohol mixture. how much of the 85% mixture will you need to add to obtain the desired solution?