If you don't know all the answers just answer the ones you do know and number them so i know which one you are answering 1.which of the following characteristics was not included in dmitri mendeleev's periodic table a. heavier elements placed in rows closer to the bottom of the table b. elements arranged by increasing atomic mass c. elements placed in columns based on chemical properties or d. distribution of elements determined by electron configuration 2. according to the periodic law what is the relationship between elements and periods a. element properties repeat from period to period b. elements in a period have the same physical properties c. elements have the same physical and chemical properties in any period or d. elements in a period have the same chemical properties 3. which of these sets of elements has similar properties consult the periodic table a. strontium, magnesium, calcium, beryllium b. oxygen, nitrogen, carbon c. hydrogen, helium, neon or d. chromium, magnesium, iron, cobalt

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes. which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature. sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent