Chemistry High School

Based on table N of the reference tables what is the number of hours required for 42k (potassium -42) to undergo three half-life periods

Answers

Answer 1

The number of hours required : 37.2 hours

Further explanation

Given

⁴²K (potassium -42)

Required

The number of hours

Solution

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.

Usually, radioactive elements have an unstable atomic nucleus.

Based on Table N(attached), the half-life for ⁴²K is 12.4 hours, which means half of a sample of ⁴²K will decay in 12.4 hours

For three half-life periods :

[tex]\tt 3\times 12.4=37.2~hours[/tex]

Based On Table N Of The Reference Tables What Is The Number Of Hours Required For 42k (potassium -42)

Related Questions

Consider X + Z -> ?

Assuming the following:

The product is an ionic compound.
Element X has 2 valence electrons
Elements Z has 6 valence electrons
Which general formula would be created?
A)ZX
B)Z^2x
C)XZ
D)X2^Z

Answers

Answer:

Explanation:

Element Z acquires two electrons from element X for stability

Can someone fill out the chart please?

Answers

Answer:

LOL i don't even know

Explanation:

Question 5 (2 points)
Which of the following has a higher boiling point, CO2 or Co? Explain.

Answers

Answer:

CO2 has higher boiling point as compared to CO

Explanation:

Because CO is linear molecule anf zero dipole moment while CO2 is non linear and it has dipole moment

You are asked to get a compound that has a low melting point and cannot
conduct electricity, which would you pick if you saw three bottles labeled as Lici,
NaBr, and BrF. What type of bond did you get? *

Answers

Answer:

the third

Explanation:

Can someone please help me with this???

Answers

Answer:

80 protons, 80 electrons, 121 neutrons

42 protons, 42 electrons, 54 neutrons

Symbol is Cu, Mass is 64, 29 Protons

Atomic number is 6, 6 protons, 6 electrons, 6 neutrons

Symbol is P, 15 protons, 15 electrons, 16 neutrons

Atomic number is 82, 82 electrons, 125 neutrons

Mass is 23, 11 protons, 11 electrons.

Hopefully this helps!

Worth 50 points. Please answer correctly

Answers

Answer:

question 2 is false

Explanation:

6 is D

elements have the same number of what when you move from the left of the periodic table to the right?

Answers

Electron shells hope this is right:)

Ans: On the periodic table, elements that have similar properties are in the same groups (vertical). From left to right, the atomic number (z) of the elements increases from one period to the next (horizontal). The groups are numbered at the top of each column and the periods on the left next to each row.

Which physical properties do glass and ice share? Select the two correct
answerS.
DA Density
D B. State
DC. Melting point
D D. Brittleness
SUBMIT

Answers

B, C

verified just did it

B. State

C. Melting Point

Both ice and glass comes under the category of solids since they have definite shape and definite volume. Both the ice and glass allows light to pass through it, that means they are transparent in nature.Ice floats, we can infer that ice must be less dense than water. If water is frozen in a glass jar, the glass jar breaks. This implies they both have similar densities.

Thus, options B and C are correct.

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brainly.com/question/11107994

Which of these chemical equations demonstrates the law of conservation of mass?
F. C3H8 + 4 O2 → 3 CO2 + 4 H2O
G. 2 H2 + O2 à 2 H2O
H. H + O à H2O
J. Mn(OH)2 + H3PO4 à 2Mn3(PO4)2 + 2H2O

Answers

Answer:h

Explanation:

What is the molar mass of phosphorus pentachloride and uranium hexafluoride?

Answers

Answer:

PCl₅ = 208.22g/mol. UF₆ = 352.03g/mol.

Explanation:

Find the atomic mass of each element–and if there's a subscript (you multiply the atomic mass by that much). P= 30.97g, Cl= 35.45g; 30.97+35.45(5) = 208.22g [same idea with UF₆]

*
What part does uplift play in the rock cycle?
A. It pulls rocks deep into Earth.
B. It pushes rocks up towards Earth's surface.
C. It breaks rocks into sediment.
D.It decreases pressure on buried rocks.

Answers

Answer:

Sometimes forces act to pull sections of the Earth's crust apart. At other times they are forced together. All this movement can cause rocks that were once underground to be brought up to the Earth's surface. This process is called uplift.

Explanation:

Hope this helped you out have a good day

What are the four level of organization in a multicellular organism?

Answers

Answer:

An organism is made up of four levels of organization: cells, tissues, organs, and organ systems. These levels reduce complex anatomical structures into groups; this organization makes the components easier to understand

Explanation:

How much force is required to accelerate an 8-kg wagon at a rate of 15 m/s

Answers

Answer:

120 N

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 8 × 15

We have the final answer as

120 N

Hope this helps you

Answer correctly please !!!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!!!

Answers

The ice cube i think is really cold

The picture is showing us how when you put a cold ice cube in a hot cup of water vapor comes out.

If 50. mL of 1.0 M NaOH is diluted with distilled water to a volume of 2.0 L, the concentration of the resulting solution is A0.025 M B 0.050 M C 0.10 M D 0.50 M E 1.0 M M

Answers

Answer: The concentration of the resulting solution is 0.025 M

Explanation:

According to the dilution law,

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of concentrated [tex]NaOH[/tex] solution = 1.0 M

[tex]V_1[/tex] = volume of concentrated [tex]NaOH[/tex] solution = 50 ml

[tex]M_2[/tex] = molarity of diluted [tex]NaOH[/tex] solution = ?

[tex]V_2[/tex] = volume of diluted [tex]NaOH[/tex] solution = 2.0 L = 2000 ml (1L=1000ml)

Putting in the values we get:

[tex]1.0\times 50=M_2\times 2000[/tex]

[tex]M_2=0.025M[/tex]

Therefore, concentration of the resulting solution is 0.025 M

The concentration of the resulting solution if 50. mL of 1.0 M NaOH is diluted with distilled water to a volume of 2.0 L is 0.025M

HOW TO CALCULATE FINAL CONCENTRATION:

The concentration of a solution can be calculated by using the following formula:

C1V1 = C2V2

Where;

C1 = initial concentration (M)C2 = final concentration (M)V1 = initial volume (L)V2 = final volume (L)

According to this question;

C1 = 1.0MV1 = 50mLC2 = ?V2 = 2000mL = 2L

1 × 50 = C2 × 2000

50 = 2000C2

C2 = 50 ÷ 2000

C2 = 0.025M

Therefore, the concentration of the resulting solution if 50. mL of 1.0 M NaOH is diluted with distilled water to a volume of 2.0 L is 0.025M.

Learn more at: https://brainly.com/question/17329736?referrer=searchResults

Based on the reading, what can you infer about
aspirin's ester group?
It provides aspirin's pain-killing ability.
It makes the compound more digestible.
It reduces fevers.

Answers

Answer:

it makes the compound more digestable

Explanation:

Answer:

it makes the compound more digestible

Explanation:

edg 2020 just got it right

brainliest please?

Which has more energy, 5 kilograms of dynamite or 10 kilograms of dynamite? Why?

Answers

Answer: The main purpose of any warhead is to inflict damage on the target. The way the damage is caused may vary with different types of warheads, but in the most general sense, damage is caused by the transfer of energy from the warhead to the target. The energy is typically mechanical in nature and takes the form of a shock wave or the kinetic energy of fragments. In either case, a large amount of energy must be released. For many warheads that energy is stored in the form of chemical explosives.

Explosive Reactions

There are many chemical reactions that will release energy. These are known as exothermic reactions. If the reaction proceeds slowly, the released energy will be dissipated and there will be few noticeable effects other than an increase in temperature. On the other hand, if the reaction proceeds very rapidly, then the energy will not be dissipated. Thus, a great quantity of energy can be deposited into a relatively small volume, then manifest itself by a rapid expansion of hot gases, which in turn can create a shock wave or propel fragments outwards at high speed. Chemical explosions may be distinguished from other exothermic reactions by the extreme rapidity of their reactions. In addition to the violent release of energy, chemical explosions must provide a means to transfer the energy into mechanical work. This is accomplished by expanding product gases from the reaction. If no gases are produced, then the energy will remain in the products as heat.

Most chemical explosions involve a limited set of simple reactions, all of which involve oxidation (reaction with oxygen). A relatively easy way to balance chemical explosive equations is to assume that the following partial reactions take place to their maximum extent (meaning one of the reactants is totally consumed) and in order of precedence:

Explanation:

Answer:

10 kilograms of dynamite

Explanation:

The more volume an object has the more potential energy is available if it is the same material. 10 kilograms is larger than 5 kilograms.

Are scientist improving the plant or corrupting it

Answers

Answer:

46 percent of trees have been cut down.

Scienctists helps plants, but humans do destroy a lot of plants.

Scientists - helps increase plant growth.

Woodchoppers - helps decrease plant growth.

only if u answer correctly u will get to recive 10pts and brainleist!

Answers

It is 2, I hope this helped

Food undergoes both physical and chemical changes during digestion. Which parts of the digestive process listed below is a physical change that takes place in the mouth?

Answers

Answer:

To answer your question use the code ICE on here to get your answer works every time for me hope this helps

What is the name given to the group 0 elements

Answers

Answer:

the noble gases

Which is the best example of forces acting in the same direction?

Answers

An object is moving across a surface, but it does not gain or lose speed.

What is the force of attraction between two atoms that are combined?

a. chemical bond
b. atomic bond
c. physical property
d. magnetic bond

Answers

Answer:

Explanation

Chemical bond refers to the forces holding atoms together to form molecules and solids. This force is of an electric nature, and the attraction between electrons of one atom to the nucleus of another atom contributes to what is known as chemical bonds.

How are a mole and a dozen similar?

Answers

each name is a given number of objects

Answer:

Each names a given number of objects.

Explanation:

Water is produced from the reaction of hydrogen and oxygen gas, according to the equation below. What is the excess reactant in the reaction of 4.2 moles of hydrogen with 3.0 moles of oxygen?

2H2(g) + O2(g) = 2H2O(L)

Select one:
a. Water
b. Oxygen
c. No excess reactant
d. Hydrogen

Answers

Explanation:

Mole ratio of Oxygen to Hydrogen gas = 1 : 2.

If we use 3.0 moles of oxygen gas, we would need 3.0 * 2 = 6.0 mol of hydrogen gas.

However we only have 4.2 mol of hydrogen. Therefore hydrogen is limiting and oxygen is in excess. (B)

How is a doorbell an example of an electrical transformation

Answers

because a doorbell transfers to inside the house to make noise

What is the coordination number for Potassium Nitrate?

Answers

Answer:

The coordination number is 8

Potassium nitrate has an octahedral coordination structure

The coordination number for potassium nitrate is 8.

how can one separate and collect the solvent from a salt solution

Answers

Simple distillation is a method for separating the solvent from a solution

EXAMPLE: water can be separated from salt solution, because water has a much lower boiling point than salt. When the solution is heated, the water evaporates.

Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements.

Answers

Answer: Edgy, 2020

Explanation: <3

Answer:

refer to picture below :)

Explanation:

_AICI3–> _AI + _Cl2
I need help

Answers

Answer:

2AlCl₃ ⇒ 2Al + 3Cl₂

Explanation:

Balance the equation–making sure there's an equal amount of reactants and products on both sides.

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