Give the chemical symbol of an element in the third period (row) of the periodic table with four 3p electrons.

How many atoms of carbon are in 2.65 g of carbon?

The is a measure of how acidic or basic a solution is.

The half-life of a certain radioisotope is 8 days. How much (mass) of a 80 mg sample will remain after 24 days?

How do moths navigate

Which of the following is a cost of recreational activities? A. Exercise B. Economic growth C. Noise D. Social interaction

Which is a quantitative observation A. 15 m long B. red color C. rough texture D. strong odor

How many moles of Na are needed to produce moles of NaCl in the reaction below 2 Na + Cl2-->> 2 NaCl A. 2 moles B. 8 moles C. 1 mole D. 4 moles

If A is slowly added to a solution containing 0.0500 M of B and 0.0500 M of C, which solid will precipitate first? The solubility product constant for A2B3 is 2.30*10-8. The solubility product constant for AC4 is 4.10*10-8.

Research three different types of fire extinguisher and explain how these can be used to put out different fires, you must relate this to the fire triangle and the section that is removed

If a mineral has a daughter to parent ration of 3:1 (three daughter atoms for every one parent atom), how many half-lives have passed since the mineral formed?