What fraction of a Sr-90 sample remains unchanged after 87.3 years?

A mixture of C3H8C3H8 and C2H2C2H2 has a mass of 2.8 gg. It is burned in excess O2O2 to form a mixture of water and carbon dioxide that contains 1.4 times as many moles of CO2CO2 as of water. Find the mass of C2H2C2H2 in the original mixture.

You look in the refrigerator and find some orange drink you had forgotten was there. the drink now has an "off" taste and bubbles. what is the most likely explanation for the changes in the drink? explain the process

Be sure to answer all parts. an empty erlenmeyer flask weighs 254.0 g. when filled with water (d = 1.00 g/cm3), the flask and its contents weigh 406.9 g. (a) what is the volume of water in the flask? enter your answer in scientific notation.

Why would it be hard to find I the ideal light intensity if the temperature was very hot or cold

What does the atomic number of an element tell you?

Modern scientists use a version of the metric system called

Which element has a larger ionic radius than calcium? a. sodium b. gallium c. magnesium d. potassium

Which solution contains the largest number of moles of chloride ions? a. 30.00 ml of 0.100m cacl2 b. 10.0 ml of 0.500m bacl2 c. 25.00 ml of 0.400m kcl d. 4.00 ml of 1.000m nacl e. 7.50 ml of 0.500m fecl3?

What is the chemical formula of titanium (II)

Not related to any subject but how do you tell someone you like them?