An element can be identified by the number of In the nucleus of its atom.

Which type of cell is E. coli? A. bacteria B. rod-shaped C. prokaryotic D. eukaryotic

What is the three main alternative sources of energy

Why do scientists measure and record mass instead of weight

AgNO3 (aq) + Cu (s) →Ag (s) + Cu (NO3) 2 (aq) is an example of which type of reaction?

Calculate the molality of a solution formed by adding 26.0 g NaCl to 74.0 g of water at 10.0 °C. The density of this solution is 1.203 g/mL at 10.0 °C. The molar mass of NaCl = 58.44 g/mol and the molar mass of H2O = 18.02 g/mol.

Match the factors which affect the rate of dissolving/dissociation/diffusion.

How would the equilibrium of an exothermic reaction at 25°c be affected if the temperature of the system were reduced? (hint: apply le chatelier's principle) ?

Which is the most practical argument for the continued funding of space exploration? a) Space exploration will one day show whether life exists on other planets in star systems similar to ours.

33 protons 36 electrons 45 neutrons

The periodic table includes all of the known elements in the world. how are elements arranged on the periodic table?