select all substances most likely covalent, formed from nonmetal atoms sharing electrons. cacl₂ h₂o nacl co₂ choose all properties that typically apply to ionic compounds. easily shaped by bending with little force brittle and likely to shatter under strong impact high melting points conduct electricity when melted or dissolved in water select all correctly matched binary molecular compound names with their formulas. carbon monoxide - co dinitrogen monoxide - no₂ sulfur trioxide - so₃ phosphorus pentachloride - pcl₅

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Accepted Answer

### First Sub - Question: Select all substances most likely covalent, formed from nonmetal atoms sharing electrons.
# Brief Explanations:
Covalent compounds are formed by non - metals sharing electrons. $CaCl_2$ has calcium (a metal) and chlorine (a non - metal), so it is ionic. $H_2O$ is formed from hydrogen and oxygen (both non - metals) sharing electrons, so it is covalent. $NaCl$ has sodium (a metal) and chlorine (a non - metal), so it is ionic. $CO_2$ is formed from carbon and oxygen (both non - metals) sharing electrons, so it is covalent.
# Answer:
$H_2O$, $CO_2$

### Second Sub - Question: Choose all properties that typically apply to ionic compounds.
# Brief Explanations:
Ionic compounds are brittle (they shatter under strong impact, not easily shaped by bending). They have high melting points due to strong ionic bonds. And they conduct electricity when melted or dissolved in water because ions are free to move. The property "Easily shaped by bending with little force" is for metals (malleable), not ionic compounds.
# Answer:
Brittle and likely to shatter under strong impact, High melting points, Conduct electricity when melted or dissolved in water

### Third Sub - Question: Select all correctly matched binary molecular compound names with their formulas.
# Brief Explanations:
- For carbon monoxide: The prefix "mono - " for oxygen and no prefix for carbon (since there is one carbon atom) gives the formula $CO$, so this is correct.
- For dinitrogen monoxide: "Di - " for nitrogen means 2 N atoms and "mono - " for oxygen means 1 O atom, so the formula should be $N_2O$, not $NO_2$, so this is incorrect.
- For sulfur trioxide: "Tri - " for oxygen means 3 O atoms, and the formula is $SO_3$, so this is correct.
- For phosphorus pentachloride: "Penta - " for chlorine means 5 Cl atoms, and the formula is $PCl_5$, so this is correct.
# Answer:
carbon monoxide - $CO$, sulfur trioxide - $SO_3$, phosphorus pentachloride - $PCl_5$

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Question

Explanation:

First Sub - Question: Select all substances most likely covalent, formed from nonmetal atoms sharing electrons.

Answer:

Second Sub - Question: Choose all properties that typically apply to ionic compounds.