HELP IM ON AN EXAM plz The following table shows the time of day when tides occurred at a coastline on a certain day of a year.

Coastline Tide Table

Date Time Type of Tide

Sunday, 4th June 2:31 a. m. Low tide

8:35 a. m. High tide

Part 1: Predict the approximate time when the next high tide and the next low tide would occur at the same coastline.

Part 2: Use complete sentences to explain your answer.

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

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.

What is the independent variable in this investigation? mass volume sample number substance density