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valina [46]
3 years ago
14

What observations can you make about this group of people?

Chemistry
1 answer:
DedPeter [7]3 years ago
7 0

Answer:The people are part of a softball team. They appear happy, they are showing number one with their fingers, and they are holding a trophy. They probably won the softball league championship

Explanation:

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Simon has collected three samples from the coral reef where he observes marine life. He must determine whether each one is a pur
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SAMPLE A - <span>pure substance.
</span>SAMPLE B - <span>homogeneous mixture.
</span>SAMPLE C - <span>heterogeneous mixture.
</span>Pure substance - <span>constant composition and properties.</span>
Homogeneous mixture - same uniform appearance and composition.
Heterogeneous mixture - <span>not </span>uniform<span> in composition, two phases (liquid and dust).
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Which compound contains ionic bonds?<br> 1. N₂O<br> 2.Na2o<br> 3. co<br> 4.CO2
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2. Na2O

Reasoning:
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3 years ago
Is Li has 7 valence electrons
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WILL GIVE 100 POINTS PLEASE HELP EMERGENCY NEED CORRECT ANSWERS
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Answer:

6. 13.8 moles

7. 0.751 moles

8. 2.04 moles

9. 0.00794 moles

10. 0.158 moles

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Hot air at 80°C is blown over a 2-m by&gt; on0 4-m flat surface at 30°C. If the average? convection heat transfer coefficient va
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Explanation:

The given data is as follows.

       T_{air} = 80 ^{o}C,       T_{surface} = 30 ^{o}C

Area of the flat plate is 2 × 4 = 8 m^{2}.

Average convection heat transfer coefficient (h_(avg)) = \frac{(20 + 100) W/m^{2} ^{o}C}{2} = 60 W/m^{2} ^{o}C}.

Hence, formula to calculate heat transfer through convection from air to the water is given as follows.

                    q = h_{avg} \times A_{surface} \times (T_{air} - T_{surface})

                        = 60 W/m^{2} ^{o}C} \times 8 m^{2} \times [(80 - 30)]^{o}C

                        = 24000 W

or,                     = 24 kW

Hence, the direction of heat flow is from air to the surface.

Thus, we can conclude that transfer of heat is 24 kW.

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3 years ago
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