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10 Cards in this Set
- Front
- Back
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Why do atoms share election? |
To have stable electron energy configurations. |
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What are the trends for melting and boiling points as they move across a period? |
Melting point and boiling points will increase initially until about the middle of the d-block, then theydecrease till the p-block, where they increase again to the middle of the p-block, and then itdecreases againbond strength between atoms will dictate the melting and boiling points and that is controlled bythe number of unpaired electrons in the outer shellmore unpaired electrons means higher melting and boiling points. |
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What are the four evidences of a chemical change? |
Release or absorption of energy in the form of heat, light, or sound.Formation of a solid or a gas without a change of state taking place.A new substance is formed.A change in color, odor, or temperature.
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What causes iconic bonds to form? |
A cation will give up an electron and an anion will gain an electron causing the cation to have a positive charge and the anion to have a negative charge these opposite charges will attract each other causing an ionic bond to form
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What is the correct formula for potassium nitride? |
K3N |
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What are the two main differences between a compound and a mixture? |
A compound does not retain the chemical and physical properties of its individual substances, a mixturedoes.A compound always combines in the same ratio of atoms, while a mixture may have different proportionsevery time.
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What is the correct formula for Arsenic(V) Chlorine? |
AsCl5 |
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What are the melting and boiling points for nonpolar covalent bonds, polar covalent bonds, and ions? Why do they follow these trends? |
Melting points and boiling points for nonpolar compounds are low because they do not havestrong bondsthe melting point and boiling point of polar molecules is in between the melting and boiling pointsof ionic compounds and nonpolar compounds, their bond strength is in between that of ions andnonpolar compoundsionic bonds are strong, polar bonds have a strength between that of ions and nonpolar
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In one mole of acetic acid, CH3COOH, there are __________ moles of hydrogen atoms. |
4. |
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Why is Hydrogen on its own? |
Because it can either lose or gain an electron. |
