What is a correct expression of the law of conservation mass

Write the quantities 3x10^-4 cm and 3x10^4 km in ordinary notations

How many grams of KOH should be dissolved in water to make 2000.0 grams of a 10.0 ppm solution?

Name one of the new products formed when acids and alkalis mix?

What are the parts of a phospholipid molecule

Tim is grilling burgers for dinner. He uses 15.0g of propane. Given that the combustion of propane releases 2,220 kJ/mol and that the molecular weight of propane is 44.097 g/mol, calculate the enthalpy of the propane used for dinner.

A gas has a volume of 30 L at 105 kPa. What pressure is required to compress the gas to 21 L?

Using special equipment which layer of the sun atmosphere is visible during a total solar eclipse

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from

What classification should this reaction have? 4Al + 3O2 → 2Al2O3