a golden colored cube is handed to you. the person wants you to buy it for $100 saying that is a gold nugget. you pull out your gold geology text and look up gold in the mineral table. and read that its density is 19.3g/cm3 you measure the cube and find that it is 2 cm on each side and weighs 40.0g what is its density? is it gold? should you buy it?

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Higher temperature = molecules move around faster. and vice versa.

Zinc contains about 30 protons 

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.