1. how did dmitri mendeleev deal with elements that had not yet been discovered?
a. he left b...
Chemistry, 07.10.2019 18:00, malachijwilson5
1. how did dmitri mendeleev deal with elements that had not yet been discovered?
a. he left blanks for them in his periodic table, as he predicted they would be discovered.
b. he gave them names and properties and placed them in the table.
c. he created them in his laboratory and placed them in the table.
d. he ignored them, placing them in the table and shifting others when they were discovered. 2. which of the following elements have properties similar to those of astatine (at)? a. f, br, i b. ar, s, p c. f, ar, ne d. na, mg, al 3.what is true of the ionic size of the elements in a group as one moves from top to bottom in that group?
a. ionic size stays the same within the group.
b. ionic size does not vary in any predictable way within the group.
c. ionic size decreases from top to bottom within the group.
d. ionic size increases from top to bottom within the group.
Answers: 2
Chemistry, 22.06.2019 05:30, jameskarbar9p8c9d2
Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat
Answers: 1
Chemistry, 22.06.2019 22:30, teagan56
Gusing the milligrams of ascorbic acid you entered above, the ratio of total sample volume to aliquot volume, and the total milligrams of the vitamin c tablet that you dissolved, calculate the mass of ascorbic acid in the vitamin c tablet for each trial. do this by scaling up to find the amount (mg) of ascorbic acid in your 250 ml flask. enter your calculated mass of ascorbic acid in the vitamin c tablet, for each trial. be sure to enter your calculated mass in the corresponding order that you entered your milligrams of ascorbic acid. the milligrams of ascorbic acid you entered for entry #1 previously should correspond to the mass of ascorbic acid that you enter for entry #1 here.
Answers: 1
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