Why does an oil-and-vinegar salad dressing have two separate layers?

The density of copper is 8.96g/ml. the mass of 7.00ml of copper is

If two line segments have the same length, which of the following must be true

Calculate the amount of heat liberated (in kJ) from 345 g of mercury when it cools from 72.7°C to 12.0°C.

Which of the following would not be defined as an acid A. KOH, B. HNO3, D. H3PO4 and why

The student placed 10 mL of PbCl2 (saturated solution) in the test tube and added a pinch of NaCl. A white precipitate of PbCl2 formed. How will this affect the concentration of Pb+2?

If you change the state of something, say, liquid to solid, is it a physical or chemical change?

What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum