CHEMISTRY HIGH SCHOOL

What element has 81 protons in the nuclei of its atoms? A. Platinum
B. Uranium
C. Lead
D. Thallium

Answers

Answer 1
Answer: Thallium has got 81 protons

Have a nice days.......
Answer 2
Answer:

Thallium has 81 protons in the nuclei of its atoms.

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A balloon, whose volume at 23°C is 535 mL, is heated to 46°C. Assuming the pressure and amount of gas remain constant, what is the volume of the balloon at 46°C?
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Describe three possible ways in which a hypothesis may arise

Answers

1- By forming evidence. 

This is when evidence and statistics are formed and found and can help form a hypothesis. 

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This is when multiple attempts form the same product

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You would predict that iodized salt would have no effect on any cases of ____________.

Answers

The body's main requirement of iodine is in the thyroid gland. Therefore, iodized salt would have no effect on any cases of Graves' disease as the thyroid gland is already overactive in this disease.
Iodized salt does not have any effect on any cases of Graves' diseases.

What is the change in heat energy when 132g of copper at 32.2°C is raised to 45.0oC? The specific heat of copper is 0.385 J/g °C.

Answers

Heat energy can be calculated by using the specific heat of a substance multiplying it to the mass of the sample and the change in temperature. It is expressed as: 

Energy = mCΔT
Energy = 132 (0.385) (45 - 32.2)
Energy = 650.50 J

Carbon disulfide is prepared industrially by reacting carbon with sulfur dioxide according to the above equation. If 70.8 g of carbon react, how many moles of CS2 are produced? Show all work, include all units, and box your answer.

Answers

Answer:

1.18 moles of CS₂ are produced by the reaction.

Explanation:

We present the reaction:

5C + 2SO₂  →  CS₂  +  4CO

5 moles of carbon react to 2 moles of sulfur dioxide in order to produce 1 mol of carbon disulfide and 4 moles of carbon monoxide.

As we do not have data from the SO₂, we assume this as the excess reagent. We convert the mass of carbon to moles:

70.8 g / 12 g/mol = 5.9 moles

Ratio is 5:1, so 5 moles of carbon react to produce 1 mol of CS₂

Then, 5.9 moles will produce (5.9 . 1) / 5 = 1.18 moles

Groups of cells that work together are called .

Answers

group of tissues form a cell , and a group of cells form an organ 

Homogenized whole milk contains 4% butterfat by volume. how many milliliters of fat are there in a glass (250 ml) of milk?

Answers

Volume of one glass of milk = 250 mL

Percent by volume of butterfat in homogenized milk = 4%

This means 4mL butterfat is present per 100mL milk

Volume of fat present in 250 mL of homogenized milk:

250mL milk*(4mL butterfat)/(100mL milk)= 10mL butterfat

Therefore, 250mL homogenized milk which is 4 % butterfat contains 10mL butterfat.

If the density of butterfat is 0.8g/mL, the mass of butterfat present in 250mL milk will be:

10mL butterfat*(0.8g butterfat)/(1mL butterfat) =8g butterfat
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