Ann dissolves four tablespoons of salt in a bowl of water. She notices that the water has become salty. Ann then keeps the bowl out in the sun for along time. The water in the bowl evaporates, leaving crystals of salt behind in the bowl.
What kinds of change(s) have happened?
1)The salt dissolving is a physical change and the evaporation of water is a chemical change.
2)Both the salt dissolving and the evaporation of water are physical changes.
3)The salt dissolving is a chemical change, and the evaporation of water is a physical change.
4)Both the salt dissolving and the evaporation of water are chemical changes

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.

14. many depressants reduce small muscle control, making it harder for a. you to steer b. your mind to consider complex problems c. the eye to scan, focus, or stay still d. the kidneys to filter alcohol out of the bloodstream