CHEMISTRY HIGH SCHOOL

Tin-126 has a half life of 100,000 years. How many years does it take toreduce 100 g of Tin-126 to 12.5 g?
100,000 years
200,000 years
50,000 years
300,000 years

Answers

Answer 1

Answer:

Answer:

300,000 years

Explanation:

100g=0 years

50g=100,00 years

25g=200,00 years

12.5g=300,000 years

Answer 2

Answer: 300’000 yes I think she is correct

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Which solution has a molality of 0.25m nacl?

If 20 milliliters of 4.0 M NaOH is exactly neutralized by 20 milliliters of HCL, the molarity of the HCL is

Answers

Volume of NaOH = 20 mL / 1000 = 0.02 L

Molarity NaOH = 4.0 M

number of moles NaOH :

n = M * V

n = 4.0 * 0.02

n = 0.08 moles of NaOH:

Finally we calculate the number of moles of HCl in the solution from the stoichiometry of the reaction :
HCl + NaOH = NaCl + H₂O

1 mole HCl ---------- 1 mole NaOH
? moles HCl --------- 0.08 moles NaOH

moles HCl = 0.08 * 1 / 1

= 0.08 moles of HCl

Volume of HCl = 20 mL / 1000 = 0.02 L

M ( HCl ) = n / V

M = 0.08 / 0.02

= 4.0 M

hope this helps!

Answer:

4.0

Explanation:

The atomic mass unit (amu) isa. the mass of a single atom of carbon
b. one millionth of a gram
c. approximately the mass of a proton
d. approximately the mass of an electron

Answers

That would be c. approximately the mass of a proton

which element is the most electronegative out of the following K Mn Br WILL MARK BRAINLIEST!

Answers

The correct answer is: [C]: "Br" {"bromine"} .
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According to Reference Table H, what is the vapor pressure of propanone at 45°C?(1) 22 kPa (3) 70. kPa(2) 33 kPa (4) 98 kPa

Answers

If we work it out with direct proportions, the vapor pressure of propanone is 56 degrees Celsius. The atmospheric pressure is about 101 kPa. If the vapor pressure is equal to the atmospheric pressure, the substance boils. Therefore, if we hold a linear proportion, 45/56 = x/101. 56x = 101*45, x = 101*45/56 = 81. The closest choice here is (3) 70 kPa.

Next time, please provide us with Reference Table H.

Final answer:

Using Reference Table H, the vapor pressure of propanone at 45°C is 33 kPa.

Explanation:

The vapor pressure of a substance changes with temperature and can be accurately determined using a Reference Table H in Chemistry. From the table, we see that the vapor pressure of propanone at 45°C is 33 kPa, which corresponds to option (2). This value shows that the vapor pressure of propanone increases as the temperature rises, which is a characteristic feature of volatile substances like propanone.

Learn more about Vapor Pressure here:

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The atoms of a certain material can absorb red and blue light frequencies. What happens to yellow light that shines on it? It is absorbed.
It is reflected.
It is transmitted.
It is either reflected or transmitted.

Answers

Answer: It is either reflected or transmitted.

Explanation:

The color of the objects is due to the light reflected to our eyes.The light falls on the surface of the object and the color which does not get absorbed by the object gets transmitted or reflected and thus appear to be of the same color as the reflected or transmitted light.

Example: If an object absorbs all of the frequencies of visible light except for the frequency associated with green light, then the object will appear green in color.

It is reflected ir transmitted depending on what the material is. The color that something appears is actually the color that it reflects or transmits and not the color that it absorbs. I hope this helps.

Which of the following compounds does NOT contain molecules?a. H2
b. NaCl
c. CO2
d. H2O

Answers

Answer:

NaCl does not contain molecules

Explanation:

Molecules are made of multiple atoms bonded together to form a single entity.

In $H_(2)$ (H-H), two hydrogen atoms are bonded together through a covalent bond. Hence it is a molecule.

In $CO_(2)$ (O=C=O), one carbon atom and two oxygen atoms are bonded together through double bond. Hence it is molecule

In $H_(2)O$ (H-O-H), one oxygen atoms and two hydrogen atoms are bonded together through single bond. Hence it is a molecule.

In NaCl, $Na^(+) and Cl^(-)$ ions are held together through ionic attraction forces. Here no actual bond exists between $Na^(+) and Cl^(-)$ . Both $Na^(+) and Cl^(-)$ remain present as individual ions.