Which of the following is a physical change?

A) burning a piece of paper

B) lighting a match

C) chopping a piece of wood

D) a rusting nail

Which type of reaction happens when a base is mixed with an acid? spontaneous reaction neutralization reaction metal-base reaction metal-acid reaction

The mass of the electron is A) about equal to the neutron. B) almost the same as the proton. C) very small compared to the proton. D) very large compared to the neutron.

The mir space station was launched by the united states true or false

A saturated fatty acid has a. one double bond within the hydrocarbon chain b. two double bonds within the hydrocarbon chain c. no double bonds within the hydrocarbon chain d. none of the above are correct

As you go across a period the atomic radius decreases because ...

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Identify and briefly describe two ecosystems in your community that are beyond schoolyard

Is N2H2 a ionic compound?

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.