Which type of reaction occurs without being started by some outside force?

combustion reaction

physical reaction

spontaneous reaction

activation energy reaction

When a wave encounters a large gapless barrier which of the following describes what will happen

A student wants to make a 5.00%solution of rubidium chloride using 0.377g of the substance. what mass of water will be needed to make the solution?

2) 800mm of Hg to Kpa

What is the independent variable of the sentence "if diet affects weight, then people who eat less will lose weight."?

The lunulanail platecuticlefree edge protects the nail matrix from the invasion of harmful substances.

The primary mechanism for converting atmospheric carbon into usable forms for life on earth is achieved by

For a particular collision, she detects the emitted products and find 15 protons, 2 antiprotons, 7 positrons, and 24 neutral particles. How many electrons are also emitted

Suppose you wanted to change the rate of a chemical reaction. what might you change in the reaction? explain the factor

Carbon-13 is an isotope of carbon. The atomic number of carbon is 6. How many neutrons does carbon-13 have?

What is the basic building block of matter to a chemist