If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 42 days?
Answers
Answer:
1250
Explanation:
Used a half life calculator, put in the given variables, and the answer was the remaining quantity. Got it right on the test as well
The answer is 1250 grams of substance will be left after 42 days.
What is Half Life ?Half-life time is the time needed for the reactants to be in its half concentration.
It is known that the decay of a radioactive isotope obeys first order kinetics.
Also, it is clear that in first order decay the half-life time is independent of the initial concentration.
If reactant has initial concentration [A₀],
after half-life time its concentration will be ([A₀]/2).
The half-life time of the substance = 14 days.
42 days means 3 half life
After 1 half life the substance left is
= 10000/2
= 5000 grams
After second Half Life
=5000/2
=2500 grams
After Third Half Life
=2500/2
=1250 grams
Therefore 1250 grams of substance will be left after 42 days.
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Related Questions
10 points
6. Which of the following tables best describes the electrical charges of
atomic particles?
(LOOK AT THE PICTURE)
NO LINKS
Answers
Answer:
table C will be the correct answer
What two forces act in the nucleus to create a 'nuclear tug-of-war'?
a.
Covalent bond, ionic bond
c.
Van der waals force, dipole
b.
Electrostatic repulsion, strong nuclear force
d.
All of the above
Answers
Answer:
Electrostatic repulsion, strong nuclear force
Explanation:
The nucleus consists of protons and neutrons. protons are positively charged while neutrons possess no charge.
Since protons are positively charged, they repel each other strongly (like charges repel). This strong repulsion of like charges makes the nucleus somewhat unstable leading to spontaneous fission of heavy nuclei.
However, an opposing force called nuclear attractive force tends to hold the nucleons together. This attraction occurs when two nucleons are bonded by a particle called a π meson.
Hence, the two forces that act in the nucleus to create a 'nuclear tug-of-war' are electrostatic repulsion and a strong nuclear force.
In molecules, energy is stored in?
Atoms
Electrons
The Nucleus
Bonds
Answers
Answer:
Atoms
Explanation:
Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy.
List two disadvantages of using synthetic dyes
Answers
• Synthetic fibres are nonbiodegradable .
• Synthetic fibres melt and burn easily.
Oxygen has 6 valence electrons. how many hydrogen atoms (who have 1 valence electrons) can bond with it? remember the octet rule.
Answers
Answer:
two hydrogen can bonded with oxygen to form H2O
Which best describes a chain reaction associated with a nuclear reaction A Neutrons released during a fusion reaction cause other to fuse B Neutrons released during a fission reaction cause other nucles to split C Helium nuclei released during a fission reaction cause other nuclei to split D Helium nuclei released during a fusion reaction cause other nuclei to fuse
Answers
Answer:
Neutrons released during a fission reaction cause other nuclei to split
Answer:
B: Neutrons released during a fission reaction cause other nuclei to split
Explanation:
How many moles of nitrogen gas are in a 25-liter tank at 350°K under a pressure
of 3.45 atm?
Answers
Answer:
Ask the teacher man i couldnt pass because of this
Explanation:
Please help ! Thanks you
Answers
Answer:
See Explanation
Explanation:
According to Avogadro's law;
V1/n1 = V2/n2
V1 = 5.0 L
n1 = 15.0 moles
V2= ?
n2 = 30.0 moles
V1n2 = V2n1
V2 = 5 * 30/15
V2 = 10 L
2) 1 mole of N2 occupies 22.4 L
3 moles of N2 occupies 3 * 22.4/1 = 67.2 L
3) 1 mole of O2 occupies 22.4 L
x moles occupies 201.6 L
x = 1 mole* 201.6 L/22.4 L
x = 9 moles
4) Density of a gas = mass/volume
Density of a gas = 39.95 g/22.4 L = 1.78 g/L
Use the drop-down menus to rank the boiling points of the following hydrocarbons. Use a "1" to indicate
the compound with the lowest boiling point.
Answers
Answer:
1. 4
2. 2
3. 3
4. 1
Explanation: just did it on edge 2021
Answer:
one.) 4
two.) 2
three.) 3
four.) 1
In a closed chamber, 58 grams of propane gas and 220 grams of oxygen gas are sparked to initiate the combustion reaction shown below. C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(l) What is the limiting reagent in this reaction?
propane
oxygen
water
carbon dioxide
Answers
Answer:
C) Propane
Explanation:
It's literally all I know
How many grams of sodium chloride could be produced from 41.3 L of chlorine gas?
Answers
Answer:
The grams of sodium chloride that will be made is 292.5 g. calculation. 2Na + Cl₂ → 2NaCl. step 1: calculate the moles of Na. moles = mass/molar mass. From periodic table the molar mass of Na = 23 g/mol. moles = 115 g/23 g / mol = 5 moles. Step 2 : use the mole ratio to determine the moles of NaCl. Na:NaCl is 2:2 = 1:1 therefore the moles of NaCl is also = 5 moles.
Explanation:
We know sodium is a very active metal and chlorine is also a very reactive non-metal. Usually, metals like to eliminate electrons and non-metals such as halogens like to accept electrons. Sodium readily eliminate its last shell electrons become Na+ cation and chlorine accepts that electron to form Cl-anion.
Remember, the graph in question 1 is a cooling curve. A substance is
changing from a gas to a liquid to a solid. Which model illustrates the
final phase change in this cooling curve?
A) Image A
B) Image B
C) Image C
D) Image D
Answers
A jar is filled to the top with water, and a piece of cardboard is slid over the opening so that there is only water in the . If the jar is now turned over, will the cardboard fall off? What will happen if there is any air in the jar?
Answers
Answer:
it will all fall unless these is air
Explanation:
Answer:
If you do it carefully enough, a small amount of water will pour out of the glass — that's supposed to happen. But try not to let any air bubbles get into the glass. Finally, slowly remove the hand holding the cardboard in place.
Balance the following chemical equation. Choose the correct coefficients in the balanced equation in order. *
4, 3, 2
2, 4, 2
1, 1, 1
3, 2, 3
Answers
Answer: 4,3,2
Explanation:
In the lab you take 50.0 mL of a 40.0 M NaOH solution and then add water to it until it reaches the 500.0 mL mark of the flask. What is the concentration of the new solution?
Answers
Answer:
4.00M NaOH
Explanation:
A 50-ml amount of 40.0M NaOH contains
(40.0 mol NaOH/1 L)×(0.0500L) = 2.00 mol NaOH
Adding enough water to make a 500.0 mL NaOH solution, the new concentration of this solution is
2.00 mol NaOH/0.5000 L = 4.00M NaOH
How much heat do you need to raise the temperature of 300 g of ethanol from 0°C to 20°C?
Answers
Answer:
14.6
Explanation:
I just took the test
The amount of heat to raise the temperature is 14.7J.
How do you calculate the heat needed to raise the temperature?The specific heat capacity of a substance is the quantity of heat needed to raise the temperature of a unit quantity of the substance by one degree. Calling the amount of heat added Q, which will cause a change in temperature ∆T to a weight of substance W, at a specific heat of material Cp, then Q = w x Cp x ∆T
By applying the formula, we get
Q = w x Cp x ∆T
Q = 300 * 2.46 * 20/1000
Q = 14.760J
What is heat?
Heat is energy that is transferred from one body to another as the result of a difference in temperature.
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How many moles are in 100 g of K3PO4 ?
Answers
Which equation is balanced?
CH4 + O2 ⟶ CO2 + H2O
Mg + 2HCl ⟶ MgCl2 + H2
Mg + P4 ⟶ Mg3P2
Answers
Answer:
A I think
Explanation:
im not sure so do with that what you will
Hello there :3 Please anwser this Combined gas law problem for me . By the way just anwser #4 for me that’s all . I uploaded the formulas on my other question if you need to use it . Please help me I don’t understand this please be an expert I will mark brianliest don’t scam me and SHOW ALL THE WORK! I just don’t understand *.* . Will report any links !
Answers
Answer:
136L
Explanation:
p1v1=p2v2
114 x44.0=37.0x V2
V2=136L
What is the function of these organelles?
Answers
Answer:
Endoplasmic reticulum, Golgi apparatus, Nucleus, Storage Organelles, and Energy - Producing Organelles.
Explanation:
Hope its right! Mark me as Brainliest if it it right ;)!
Which of the following statements are true about elements and compounds?
A. Elements are made up of compounds.
B. Compounds are made up of elements
C. Elements can be shown with chemical symbols, but compounds cannot.
D. Elements and compounds are the same thing.
Answers
Answer:
the answer is b
hope this helps :)
please crown me brainliest!!!!
I need help help me out with this plz
Answers
Answer:
D good luck on your test
Explanation:
What is the balanced equation for the reaction of a solution of sodium sulfate is mixed with strontium chloride?
Answers
Answer:
NaSO⁴(ads) ,ganadicate
calculate the mass of 0.8 moles of Fe(NO3)3 (H2O)9
Answers
Answer:
Molar mass of (Fe(NO3)3)(H2O)9 is 403.9972 g/mole
Explanation:
the formula to find the mass of moles
Worked Example: molar mass = mass ÷ moles (M=m/n) Calculate the molar mass of a pure substance if 1.75 moles of the substance has a mass of 29.79 g.
i think it help you
If there were 11.25 moles of solute in a 6.0M solution, what volume would it have?
Answers
Answer:
1.875 dm^3
Explanation:
M = moles of solute ÷ volume of solution
M =11.25 x 6
= 1.875 dm^3
2L is the correct answer .
HOW TO CALCULATE ??
Given : moles of solute(n) = 11.25Molarity (M) = 6
To Find : Volume of the solution (v) = ?Key concept : [tex]M=\frac{n}{V(inL)}[/tex]On puting values and solving we get , V = 1.875 L ≈ 2L
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PLEASE HELP. I WILL GIVE BRAILIEST. I DON'T HAVE TIME PLEASE Which type of reaction does this diagram represent?
C H 3 single bonded to C, which is single bonded above to H and double bonded to O, plus H C N right arrow C H 3 single bonded to C, which is bonded above to H, to the right to O H, and below to C N.
addition
condensation
elimination
substitution
Answers
Answer:
addition
Explanation:
Answer:
Explanation:
Edge 2022
How many moles of oxygen gas occupy 67.2 L of volume at STP?
A 0.333
B 3.00
C 1.00
Answers
Answer:
I would say b hope this helps
Explanation:
have a good day btw i had this question before:D
why did plants perform cellular respiration?
Answers
Answer:process of cellular respiration allows plants to break down glucose into ATP. ... Although plants use photosynthesis to produce glucose, they use cellular respiration to release energy from the glucose.
Explanation:
Direction: Read each situation in the table below, then state if it is a density-independent limiting factor or a density-depent limiting factor. Indicate the specific limiting factor that is occuring.
☞︎︎︎Please help me☜︎︎︎
❌NONSENSE➪ REPORT❌
Answers
Answer:
1. Dependent, carrying capacity
2. Dependent, dinoflaggelates
3. Independent, oil spill
4. Dependent, virus
5. Independent, typhoon
6. Independent, deforestation
7. Dependent, predation
8. Dependent, human exploitation
9. Dependent, virus
10. Independent, oxygen depletion
Explanation:
.60 L .of 95 M solution of NaCl is allowed to evaporate until it has a volume of .25L What is the concentration of the new solution?
Answers
Answer:
2.28 M
Explanation:
Using the formula as follows;
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (L)
V2 = final volume (L)
According to the information given in this question;
C1 = 0.95M
C2 = ?
V1 = 0.60L
V2 = 0.25L
Using C1V1 = C2V2
0.95 × 0.60 = C2 × 0.25
0.57 = 0.25 C2
C2 = 0.57 ÷ 0.25
C2 = 2.28 M