CHEMISTRY HIGH SCHOOL

The half-life for the process 238u→206pb is 4.5×109 yr. a mineral sample contains 61.0 mg of 238u and 15.5 mg of 206pb. part a what is the age of the mineral

Answers

Answer 1

Answer:

The age of the mineral is 8.9×10⁹ years.

We'll begin by calculating the rate constant.

Half-life (t½) = 4.5×10⁹ years

Rate constant (K) =?

$K = (0.693)/(t_½) \n \n K = \frac{0.693}{4 * {10}^(9) } \n \n K = 1.54 * {10}^( - 10) /year \n \n$

Finally, we shall determine the age of the mineral.

Original amount (N₀) = 61.0 mg

Remain remaining (N) = 15.5 mg

Rate constant (K) = 1.54×10¯¹⁰ / year

Time (t) =?

$t = (2.303)/(k) log( (N_0)/(N) ) \n \n t = \frac{2.303}{1.54 * {10}^( - 10) } log( (61)/(15.5)) \n \n t = 8.9 * {10}^(9) years$

Therefore, the mineral is 8.9×10⁹ years old.

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The gas production not recognized as nitrate reduction is because organisms that can ferment also produce gas. Therefore even if gas is produced on the tube, you can't tell if it's by fermentation or by nitrate reduction. I hope the answer helps.

How many phases does a solution have?explain

Answers

Did you perhaps mean the phase of matter?If so, then a solution has only one phase of matter: liquid. It is always almost always liquid because solutions are made up of a solvent and a solute and a solvent is always a liquid. Though, some may come in an emulsion form, but still it can be considered as liquid

Final answer:

A solution can exist in three phases: solid, liquid and gas, depending on the temperature and pressure. The pH of the solution can also change based on the nature of ions present in it. Understanding the nature and properties of solutions is crucial for many chemical reaction processes.

Explanation:

A solution can exist in three phases depending on the temperature and pressure, which are: gas, liquid, and solid. These are depicted in a phase diagram (an illustrative depiction that shows the states of a substance under different conditions of temperature and pressure).Consider the phase diagrams for a pure solvent and a solution. When a nonvolatile solute is dissolved in a solvent, a solution is formed. These states coexist and are in a state of thermal equilibrium at specific combinations of pressures and temperatures.

In addition to the physical phase, the pH of the solution can also be considered as a 'phase.' The pH can decrease, increase, or even show a pattern of increase and then decrease depending on the nature of ions present in the solution.

Solutions are crucial to life-sustaining processes as well as other chemical reaction processes. It's important to know the nature of solutions and factors determining its formation and properties for understanding various biological, geological and industrial processes.

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having food in your stomach does not allow to keep alcohol from being absorbed but it does allow you to not get intoxicated as fast. this is a (FACT)!!!!

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c. Catalysts are used up during a chemical reaction.
d. Catalysts lower the activation energy of a chemical reaction

Answers

I think the best answer for this is D. Catalysts lower the activation energy of a chemical reaction. Catalyst is a substance that speeds a chemical reaction. It is not consumed as the reaction proceeds. A catalyst offers a new route for faster reaction.

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Public Domain

0 meters
50 meters
100 meters
150 meters

Answers

Answer: The thermocline begins at 100 meters of depth.

Step-to-step explanation:-

Thermocline is a transition oceanic water layer between deep and surface water in which water temperature decreases rapidly with increasing depth.

From the given graph it cam be seen that at 100 meters the thermoline begins such that the temperature drops from $27^(\circ)$ to $24^(\circ)$ .

Hence, the thermocline begins at 100 meters of depth.

Answer:

D. 150 m

Explanation:

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Answers

Answer is Ca which is a metal.

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Calcium present helps in the formation of bones and teeth and maintaining it to keep healthy.

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Calcium is a metal as it can easily loose 2 electrons to obtain a stable configuration.

$Ca\rightarrow Ca^(2+) +2e^-$

Final answer:

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Explanation:

The element that makes milk good for health is Calcium. Calcium is a metal that is needed by the body for healthy bones, teeth, and proper function of the heart, muscles, and nerves. It is a representative metal that shows good conduction of heat and electricity. Milk is a primary source of Calcium, which is why it is considered beneficial for health.

On the other hand, elements such as boron, silicon, germanium, arsenic, antimony, and tellurium are considered metalloids or sometimes semimetals, which exhibit properties between metals and nonmetals. However, these are not the elements responsible for the health benefits of milk.

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