Explain the three ways that machines can make work easier

Which type of reaction occurs without being started by some outside force? combustion reaction physical reaction spontaneous reaction activation energy reaction

Is coffee a mixture or compound

Number of moles in 3.70 x 10^-1 g of boron

Describe one everyday situation in which it would be useful to identify an unknown substance

A (n) (blank) material let's light pass through freely Once again this is science but I don't see science so I'm putting chemistry

How many protons are in an ion with 54 electrons and a - 1 charge?

Which of the following experimental observations proved that the idea of matter and mass being evenly distributed in an atom was flawed? A. Less than 1% of the alpha particles went un-deflected through the gold foil. B.

Ionization involves completely removing an electron from an atom. light of a particular wavelength can cause ionization to occur if it has the required energy. the energy to ionize a certain element is 342 kj/mol.

How many molecules are contained in a 7.20-g sample of dimethylmercury?

Could a nuecles of more than one proton but no nuetron exist? Explain