Why do cells have a plasma membrane?

A. to separate protein from the nucleus

B. to distinguish plants from animals

C. to define the size of the cell

D. to separate the inside of the cell from its enviroment

How many valence electrons does arsenic have?

How would the percent yield be affected if the na2co3 was not thoroughly dried in the crucible before weighing?

What will happen to the temperature of a substance if the kinetic energy of the molecules decreases?

How does bohr's model of the atom differ from rutherford's?

Could an atom have. 9 of a neutron

Magnesium and calcium have similar chemical properties because a magnesium atom and a calcium atom have the same (1) atomic number (2) mass number (3) total number of electron shells (4) total number of valence electrons

Which properties change the composition of a substance? Physical properties Neither chemical nor physical properties Chermical and physical properties Chemical properties

A seismograph uses a ... to record drums vibration

The volume of a gas is 36.0 ml at 10.0°c and 4.50 atm. at what temperature (°c) will the gas have a pressure of 3.50 atm and a volume of 85.0 ml?

Velocity is the slope of the acceleration vs. time graph. O A. True False