The halogens; F2, Cl2, Br2, I2, and oxygen and nitrogen O2, N2
H2 is purely covalent, as are all diatomic molecules consisting of only one element.
It is Ionic
Because Purely covalent substances have no electrical charge. Take a molecule of Silicone Dioxide for instance, the Oxygen atoms are pulling in opposite directions, so their individual polarities cancel each other out, making the molecule pure. Not having electrical polarity or tendency. neither positive or negative. If a molecule does not have a charge, there is nothing to make it want to bond or react with other molecules or atoms. a Purely covalent substance is a "happy" or "content" substance. it wants to stay exactly as it is.
The molecule is covalent, the N-F bonds are polar covalent.
Purely covalent bonds, because it is 'all-sided' symetrical.
H2 is purely covalent, as are all diatomic molecules consisting of only one element.
It is Ionic
Because Purely covalent substances have no electrical charge. Take a molecule of Silicone Dioxide for instance, the Oxygen atoms are pulling in opposite directions, so their individual polarities cancel each other out, making the molecule pure. Not having electrical polarity or tendency. neither positive or negative. If a molecule does not have a charge, there is nothing to make it want to bond or react with other molecules or atoms. a Purely covalent substance is a "happy" or "content" substance. it wants to stay exactly as it is.
The molecule is covalent, the N-F bonds are polar covalent.
Purely covalent bonds, because it is 'all-sided' symetrical.
purely covalent - there is a double covalent bond between the two carbons
No, as it consists of two nonmetals it is covalent.
Covalent bonds are between non-metals only. Methane is a hydrocarbon (CH4. Therefore it is COVALENTLY bonded because of the bonds between carbon (non-metal) and hydrogen (non-metal). Ionic compounds only apply to those made of metals and non-metals.
These bonds tend to be ionic. However, all bonds are somewhere between purely ionic and purely covalent.
I'm not sure what you mean by "purely covalent", since the ionic-vs-covalent distinction is expressed in terms of electronegativity, which can take a range of values (higher values = more ionic). CO is very much a covalent compound though.
No, it doesn't contain starch. Gelatin is purely ground-up animal bone.
Tap water is H2O (with some trace impurities). This makes it a covalent molecule.