Which of these best describes one of the subatomic particles that could be found at location X in the model of an atom shown on the left? (STAAR 8.5A & 8.3B)
Select one:
O a. It has mass but no charge.
O b. It has a large mass and a negative charge.
O c. It has no mass and a positive charge.
O d. It has no mass and an equal number of positive and negative charges.

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?

Carbon-14 undergoes radioactive decay in the reaction above. determine the type of radiation emitted in this reaction and describe what is happening to the nucleus during this reaction.