Periodic Trends&Atomic structures
State the number of electrons lost or gained when the following elements form ions:
Sr
2e-lost
Calculate each of the quantities in 2.00 mol of H3PO4
a. moles of H
b. moles of O
c. atoms of P
d. atoms of O
a. 6.00 mole of H
b. 8.00 mole of O
c. 1.20 x 1024 atoms of P
d. 4.82 x 1024 atoms of O
Write the symbols for the ions with the following number of protons and electrons:
a. 3 protons, 2 electrons
Li+
Discuss the changes in the potential and kinetic energy of a roller-coaster ride as the roller-coaster car climbs to the top and goes down the other side.
a. 3.5 kcal
b. 99.2 cal
c. 120 J
d. 1100 cal
How much energy is needed to change the temperature of 50.0 g of water by 15.0oC?
3140J
6.11 Write the names for each of the following ions:
Li+
lithium
Calculate the molar mass for each of the following:
a. NaCl, table salt
b. Fe2O3, rust
c. C19H20FNO3, paxil, an antidepressant
a. 58.44g
b. 159.7g
c. 329.4g
Write the symbols for the ions, and the correct formula for the ionic compound formed by each of the following:
a. potassium and sulfur
K+ and S2- K2S
Convert each of the following energy units:
a. 3500 cal to kcal
b. 415 J to cal
c. 28 cal to J
d. 4.5 kJ to cal
a. 3.5 kcal
b. 99.2 cal
c. 120 J
d. 1100 cal
How many grams of water can be heated from 20.0 oC to 75oC using 12500.0 Joules?
120 g
Write the correct ionic formula for the compound formed between each of the following pairs of ions:
Na + O2-
Na2O
Calculate the mass percent composition of each of the following: A
a. MgF2, magnesium fluoride
b. Ca(OH)2, calcium hydroxide
c. C4H8O4, erythrose, a carbohydrate
d. (NH4) PO4, ammonium phosphate, fertilizer
e. C17H19NO3, morphine, a painkiller
a. 39.01% Mg; 60.99% F
b. 54.09% Ca; 43.18% O; 2.721% H
c. 40.00% C; 6.714% H;53.29% 0
d. 28.19% N; 8.115% H; 20.77% P; 42.92% O
e. 71.55% C; 6.710% H;4.909% N; 16.82% 0
Write the name for each of the following ions (include the
Roman numeral when necessary):
a. Fe2+
Iron(ll)
Calculate the specific heat (J/g °C) for each of the following:
a. a 13.5-g sample of zinc (Zn) heated from 24.2 °C' to 83.6 °C
that absorbs 312 J of heat
b. a 48.2-g sample of a metal that absorbs 345 J with a temperature increase from 35.0 °C to 57.9 °C
a. 0.389 J/gºC
b. 0.313 J/gºC
What is the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0oC?
45.1 c
draw the electron configuration for sulfur
1s22s22p63s23p4
draw the electron configuration for chlorine
1s22s22p63s23p5