Use the data table and information below to answer the following questions. A scientist used a laboratory model to test the effect of radiation, or the sun, in heating land and water on Earth. To do this experiment, 200 mL of water and dry sand were placed in to 2 separate 250-mL beakers. Each beaker was then placed under the same lamp. Temperature readings were taken of each substance every 2 minutes for 8 minutes.

Use the data table to answer the following questions.

Substance Heated
Starting Temp (°C)
2 min
4 min
6 min
8 min
Water
18
18.5
19.5
21
22
Dry Sand
18
20
22
24
26

Is this a controlled experiment? Explain.

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assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

it takes on an electronical energy