Chemistry, 23.10.2020 16:10 lareynademividp0a99r
Which properties do not change the composition of a substance?
A: neither chemical nor physical properties
B: chemical and physical properties
C: chemical properties
D: physical properties
Answers: 2
Chemistry, 22.06.2019 02:00
The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?
Answers: 3
Chemistry, 22.06.2019 05:00
1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false
Answers: 3
Chemistry, 22.06.2019 05:30
Describe the interaction that occurs between two objects with the same electrical charge.
Answers: 1
Chemistry, 22.06.2019 09:00
What is the percentage composition of carbon in the compound ch4
Answers: 1
Which properties do not change the composition of a substance?
A: neither chemical nor physical pro...
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