The molar mass of calcium is 40.08, oxygen is 16.0, and hydrogen is 1.01. What is the mass of one mole of calcium hydroxide (Ca(OH)2)?

Answers

Answer 1

Answer: $Ca(OH)_2$

$MM=Molar~mass$

$MM_(Ca(OH)_2)=MM_(Ca)+2*(MM_O+MM_H)$

$MM_(Ca(OH)_2)=40.08+2*(16.0+1.01)$

$MM_(Ca(OH)_2)=40.08+2*(17.01)$

$MM_(Ca(OH)_2)=40.08+34.02$

$\boxed{\boxed{MM_(Ca(OH)_2)=74.1~g/mol}}$

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Compared with warm fronts, cold fronts are?

Answers

Warm fronts is the transition zone that marks where a warm air mass starts replacing a cold air mass. The movement is from southwest to southeast while Cold fronts is where a cold air mass is pushing into a warmer air mass. They move fast, up to twice as fast as a warm front.

50 POINTS Which of the following is a synthesis reaction?

2H2O yields 2H2 + O2

H2 + Cl2 yields 2HCl

2Li + CaO yields Li2O + Ca

CH4 + 2O2 yields CO2 + 2H2O

Answers

You will notice that the first answer decomposes into two seperate products with 1 reactant, so since this is only true of decomposition reactions, that is not the answer.

H2+Cl2 yields 2HCl could be the answer, as it starts with 2 reactants and ends with one product, something found in synthesis reactions.

The third answer is incorrect because even though there are no decompositions of single products, the metal exchanges positions, something that only occurs in decomposition reactions.

In the fourth answer is also incorrect because the methane is oxidized. This only happens in decomposition reactions.

The correct answer, then, is B.

Which radioisotope is used for diagnosing thyroid disorders?(1) U-238 (3) I-131
(2) Pb-206 (4) Co-60

Answers

The correct answer is option 3. The radioisotope used for diagnosing thyroid disorders is I-131. This isotope is used due to its low expense compared to other radioisotopes. I- 31 is a beta and gamma emitter used for the ablations of thyroid tumors.

Final answer:

I-131 (Iodine-131) is the radioisotope used for diagnosing thyroid disorders. It is selectively taken up by the thyroid gland and its emissions allow for imaging of the gland.

Explanation:

The radioisotope used for diagnosing thyroid disorders is I-131 (Iodine-131). This radioisotope is used in medical procedures due to its unique characteristics. When consumed, it is selectively taken up by the thyroid gland. I-131 emits beta particles and gamma radiation which allows for imaging of the thyroid gland. This in turn helps health professionals diagnose if the thyroid is functioning normally or if disorders such as hyperthyroidism or tumors are present.

Learn more about I-131 Radioisotope here:

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A solid and a liquid are shaken together in a test tube to produce a milky mixture that eventually separates into a clear liquid and a white solid.

Answers

this is called suspension

Which compound is a saturated hydrocarbon?

Answers

Saturated hydrocarbons are organic compounds that contain only single bonds between the carbon atoms. They are known to be the simplest organic compounds. They are termed as such because they are saturated with water. Examples are the alkanes (ethane, methane, propane, butane, etc.).

Which of the following is true about the concept of half-life?A. Half-life measures the rate of decay of a radioisotope.
B. The shorter the half-life, the more dangerous the radioisotope.
C. Half-life predicts which atoms in a radioactive sample will decay.

I think it`s A?

Answers

Its A. because it measures the rate of the decay of the isotope

it is A Half-life measures the rate of decay of a radioisotope.

I took the test

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