3)

Atoms of which two elements have a combined total of 23 protons?

A) Sodium, Na, and magnesium, Mg

B) Boron, B, and carbon, C

C) Copper, Cu, and zinc, Zn

D) None of these

How many valence electrons are in carbon?

If a solution turns litmus paper turns red, which type of solution is it? Question 5 options: an acid a neutral solution a base Save

In a first order reaction, what fraction of the reactant will remain after 4 half-lives?

a student filled a graduated cylinder to 7.4 ml, then adds a handful of pebbles. after the pebbles are added, the graduated cylinder water level reads as 8.2 ml. calculate the volume of the pebbles

A solution is another name for

For the reaction 2N 2O (g) ⇌ O 2 (g) + 2N 2 (g), what happens to the equilibrium position if the pressure increases?

A chemistry student needs 90.0g of glycerol for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of glycerol is 1.26·gcm-3. calculate the volume of glycerol the student should pour out.

A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3. Calculate (a) the mass percentage, (b) the mole fraction, (c) the molality, (d) the molarity of H2SO4 in this solution.

Darwin visited the Galapagos Islands several times. He observed some very unusual species. One species of bird, the finch, interested him. He observed some differences in the finches living on different islands.

Why does land heat up more faster than water?