A marathon is a race that commemorates the run made by a Greek soldier, Pheidippides, that took place in August 490 BC. The soldier ran 26.2 mi. How many kilometers did he run?

The Mohs hardness scale increases linearly from 1 to 10 true or false?

What does the law of conservation of mass state? a. mass cannot be created nor destroyed in a chemical reaction. b. mass can be created and destroyed during a chemical reaction. c. mass can be created but not destroyed in a chemical reaction. d.

Which of the following is a sign a chemical reaction has occurred? A blue liquid is mixed into a yellow liquid, and the mixture turns green. A piece of metal is placed in water and produces sparks and gas.

A scientist spilled a few drops of dilute hydrochloric acid (hcl) on a lab table. for safety purposes, the scientist sprinkled some baking soda (nahco3) onto the spill.

Which of the statements is true about chemical reaction rates the reaction rates can change the reaction rates are always constant the reaction rates cannot increase the reaction rates cannot decrease

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?

A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin.

Which suitable method can be used to separate a mixture of sand and paraffin

How many vowels does the word love have

What is silicon used for? -matches -gunpowder -glass -steel can coating