Which stays the same during chemical reactions?

the overall types of atoms only

the overall numbers of atoms only

both the overall types and numbers of atoms

neither the overall types or numbers of atoms

3. He described bases as feeling, changing litmus to the color, and becoming less basic when mixed with an

A blank and blank are examples of solids

Which periodic group has the smallest atomic radius?

Calculate q (in units of joules) when 1.850 g of water is heated from 22 °C to 33 °C

A titration was performed on 50.0mL of 0.250 M NaOH. After the addition of 7.14mL of HCI, the phenolpthalein indicatorchanged from pink to colorless. What was the concentration ofthe hydrochloric acid?

Calculate [OH-] for each solution. 1. pH = 13.48 Express your answer using two significant figures. 2. pH = 8.19 Express your answer using two significant figures. 3. pH = 2.12 Express your answer using two significant figures.

State whether the following statements are true or false (with justification). (a) 1 mol of N2 has more molecules than 1 mol of Ar. (b) 1 mol of N2 has more mass than than 1 mol of Ar. (c) The molar mass of N2 is greater than the molar mass of Ar

One year ago, you sold a put option on 100,000 euros with an expiration date of 1 year. you received a premium on the put option of $0.04 per unit. the exercise price was $1.22. assume that 1 year ago the spot rate of the euro was $1.

Calculate the product of 0.0002115m and 0.0000405m. Express the answer in scientific notation

How do the different spheres of Earth interact? Volcanic eruptions are natural phenomena in the. They sometimes erupt, spilling out lava and dust. The lava solidifies, forming new landmasses.