A change in the number of protons or neutrons occurs in which type of reaction?

A: electrochemical reaction

B: thermochemical reaction

C: nuclear reaction

D: chemical reaction

How did Lavoisier transform the field of Chemistry in the late 1700's

In an unconformity between two layers of rock how is the upper layer usually described

A balloon containing helium gas expands from 230 mL to 860 mL as more helium is added. What was the initial quantity of helium present if the expanded balloon contains 3.

The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg + O2 Right arrow. 2MgO Niven wants to calculate the mass of MgO that is produced by the burning of 28.0 g of Mg.

What is true in the saturated solution? A. no more solute can be dissolved B. no more solvent can be dissolved C. no more solution can be made D. The concentration cannot be decreased

When water is placed in a thin glass tube, it tends to climb up the walls of the tube. This effect is known as capillary action. What causes this capillary action? A. metallic bonding B. covalent bonding C. ionic bonding D. hydrogen bonding

Earth rotates once every 24 hours. What does this mean? A. Earth makes one full trip around the Moon every 24 hours. B. Earth completes a full spin on its axis once every 24 hours. C. Earth makes one full trip around the Sun every 24 hours. D.

Compare and contrast the outer core and the inner core.

What colors make the color turquoise?

12.23 g of ammonia (NH3) are dissolved in enough water to make 560.0 mL of solution. How many moles of NH3 are added to the water?