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12 Jan 2018

(a) Which subatomic particle(s) cannot change in an atom of a certain element?

(b) Hydrogen is found in nature in the form of 3 different isotopes called hydrogen, deuterium, and tritium. What does make them different?

(c) An atom of iron is charged (+3). What do we call such atom?

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Patrina Schowalter
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14 Jan 2018
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2- What are some positive interactions as well as negative interactions we have with microorganisms? Remember, we have ca. 10X more microbial cells on or in our bodies than we do cells of our bodies.

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7- Remember that molecules (combinations of 2 or more atoms) are held together with chemical bonds.

8- How does a covalent bond differ from an ionic bond? What distinguishes a polar molecule from a non-polar molecule?

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I'm not getting those questions

1) ATOMS, WATER AND MOLECULES

a) Approaches to investigating life are guided by what ?

b) An attractive force that link 2 atoms together in a molecule is called?

c) Which chemical bond is the strongest and involves the sharing of cletrons?

d) Which bonds are explained by the sharing of an hydrogen atom?

e) what does it mean if a molecule is hydrophilic? Hydrophobic?

f) What atoms, and how many of them, make up water?

g) Differentiate between a solute, a solvent, and a solution?

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