1) Which of these bonds is most easily broken? 1. All are equally easy to break
2. Hydrogen Bond
3. Ionic Bond
4. Covalent Bond

2)Hydrogen bonds are formed due to .
1. Electromagnetic attraction
2. Sharing of electrons
3. Stealing of electrons
4. 'Stickiness' due to protons and neutrons

3) What is a polar molecule?
1. A molecule found either at the north or south pole
2. A molecule with a positively charged end and a negatively charged end
3. A molecule with a distinct beginning and end
4. Any molecule that includes oxygen

4)Water tension is an example of .
1.Oxygen bonding
2.Hydrogen bonding
3.Isometric bonding
4. Covalent bonding

1.  2)Hydrogen Bond

2. 1)Electromagnetic attraction

3. 2) A molecule with a positively charged end and a negatively charged end

4. 2.Hydrogen bonding

* i think i am right and i really hope so but please dont

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explanation:

Individual hydrogen bonds are weak and easily broken; however, they occur in very large numbers in water and in organic polymers, creating a major force in combination. Hydrogen bonds are also responsible for zipping together the DNA double helix.

A hydrogen bond is formed when the positive end of one molecule is attracted to the negative end of another. The concept is similar to magnetic attraction where opposite poles attract. Hydrogen has one proton and one electron. This makes hydrogen an electrically positive atom because it has a deficiency of electrons.

A polar molecule is a chemical species in which the distribution of electrons between the covalently bonded atoms is not even. Some chemical species, such as chains of carbon molecules, share electrons equally and are said to be nonpolar molecules

Water molecules forming hydrogen bonds with one another. The partial negative charge on the O of one molecule can form a hydrogen bond with the partial positive charge on the hydrogens of other molecules. Water molecules are also attracted to other polar molecules and to ions.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.