2. Chalk is composed of Calcium, Carbon and Oxygen. In order to find the molar mass of chalk you need to add one calcium, one carbon and three oxygen atoms. Mass of calcium: g

Mass of carbon: g

Mass of oxygen: g x3 = g

Total molar mass: g/mol

3. Initial mass of one piece of chalk and record your results: __23.3_g

4. Find the final mass of the chalk (g) used to write your names: __13.3__g

5. Determine the amount of chalk (g) used to write your names: g (Initial-Final)

6. Convert the amount of grams of chalk (CaCO3) to moles. (remember to use the molar mass)

7. Now convert the amount of moles to atoms. (remember 1mol=6.02x1023 atoms)

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

answer: they produce more slow than unicellular organisms.

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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