The time taken by Carbon-14 to decay radioactively from 120g to 112.5g is 22,920 years.
How do we calculate the total time of decay?Time required for the whole radioactive decay of any substance will be calculated by using the below link:
T = (n)(t), where
t = half life time = 5730 yearsn = number of half life required for the decayInitial mass of Carbon-14 = 120g
Final mass of Carbon-14 = 112.5g
Left mass = 120 - 112 = 7.5g
Number of required half life for this will be:
1: 120 → 602: 60 → 303: 30 → 154: 15 → 7.54 half lives are required, now on putting values we get
T = (4)(5730) = 22,920 years
Hence required time for the decay is 22,920 years.
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pls help will give brainliest
The average Christmas present has a density of 2.15 kg/L. What would you expect the mass (in grams) to be of a present having a volume of 3650 mL?
The mass of a present which has a density of 2.15 kg/L and volume of 3650 mL is 7.74 kg.
How do we calculate mass?Mass of any substance will be calculate by using the density and volume by using the below equation as:
Density = Mass / Volume
Given that,
Density of Christmas present = 2.15 kg/L
Volume of present = 3,650 mL = 3.6L
On putting values, we get
Mass = (2.15)(3.6) = 7.74
Hence required mass of Christmas present is 7.74 kg.
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If 130.0 g of steam at 200.0 °C absorbs 900.0 kJ of heat energy, what will be its increase in temperature?
Help pleaseeeeee
Answer:
t=1855.45 C
Explanation:
m=0.13kg t1=200C H=900000J Cp=4182J/kgC
h=m*cp*change in temperature
900*10^3=0.13*4182*(T-200)
1655.45=t-200
t=1855.45 C
Which one of the following substances is expected to have the highest boiling point? question 1 options: hf hcl hi hbr
The compound that have the highest boiling point is HF, hydrogen fluoride. The correct option is A.
What is the boiling point?
The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.
Hydrogen fluoride ha the highest electronegativity among HCl, HI, and, HBr, and it can form hydrogen bond quickly compared to other compounds, that's why HF has the highest boiling point.
Thus, the correct option is A, HF.
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Is a Repulsive Interaction
Highest Potential Energy
Lowest Potential Energy or
Middle amount of Potential Energy
Answer:
I think it is Middle amount of Potential Energy
Explanation:
The repulsive interaction comes from the knowledge of the effective electron density function F(r) which satisfies the Poisson equation V'U(r) = F(r). A constant based on the valence electrons of two combining atoms is introduced and assumed to be characteristic for both the states.In quantum mechanics, a repulsive state is an electronic state of a molecule for which there is no minimum in the potential energy. This means that the state is unstable and unbound since the potential energy smoothly decreases with the interatomic distance and the atoms repel one another.hope this helps you have a blessed day
Answer:
I don't now the answer but you can give branaillest to the other person how answered it
Explanation:
The particles of matter which may or may not have independent existence.
help
Answer: An atom
Explanation:
Answer:
An Atom
Explanation:
Atom was invented by John Dalton.It may have independent existence,it may not as well, it's undiscovered.It's a particle of matter.If it combines with another atom then molecule is formed.Is this chemical equation balanced?
Yes or no
Answer:
Yes, the chemical equation is balanced.
Explanation:
As, No.of Reactants=No.of Products.
Answer:
Yes
Explanation:
4Fe+3O2
4Fe
3O2
So therefore 6 Oxygen atoms
2Fe2
2x2
Therefore 4 Iron atoms
2O3
2x3
Therefore 6 Oxygen atoms
what keeps the planets in orbit in our solar system
A heterozygous dominant green pea plant is crossed with a homozygous recessive yellow pea plant.
Which of the following Punnett squares correctly represents the possible offspring resulting from this cross?
The combination of the genotypes of heterozygous dominant green pea plant and a homzygous recessive yellow pea plant that will be in the punnet square is Gg × gg.
What is a punnet square?A punnet is a graphical representation used to determine the probability of an offspring expressing a particular genotype.
According to this question, a heterozygous dominant green pea plant is crossed with a homzygous recessive yellow pea plant.
The heterozygous dominant green pea plant has a genotype of Gg while the homzygous recessive yellow pea plant has a genotype of gg.
Therefore, the combination of the genotypes of heterozygous dominant green pea plant and a homzygous recessive yellow pea plant that will be in the punnet square is Gg × gg.
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What is the action force on a hot air balloon?
balloon stays in place
balloon tilts sideways
balloon descends
balloon rises
Action and reaction forces are Newton's law of motion. The action force on the hot air balloon makes them rise.
What is Newton's third law?Newton's third law or the law of action and reaction is present that allows describes the force applied to the object in opposite and equal in magnitude when the two objects interact mutually.
The action force is the force applied with a magnitude and in a direction opposite to the reaction force of the object. In the case of hot air balloon action, force is applied from down to the upper direction that allows the balloon to rise.
Therefore, the action force option D. allows the hot air balloon to rise.
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1 reason we used ferrocene in this experiment is because it reacts much faster than benzene
The reason behind the use of ferrocene in the experiment is because it reacts much faster than benzene.
What is ferrocene?
Ferrocene is an organometallic compound which consist of two cyclopentadienyl rings bound to a central atom of iron.
The aromatic cyclopentadienyl rings in ferrocene have a lot of electrons and go through a lot of the same reactions as benzene.
In fact, most metallocenes are more electrophilic reagent reactive than benzene, indicating that electrons are more readily available.
Thus, the reason behind the use of ferrocene in the experiment is because it reacts much faster than benzene.
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A gas occupies a volume of 500. milliliters at a pressure of 38.0 kPa and a temperature of 298 K. At what temperature will the gas occupy a volume of 250. milliliters and have a pressure of 76.0 kPa?
**I NEED ANSWERS STEP BY STEP PLEASE**
The gas occupied a volume of 250 ml and a pressure of 76kPa at 298K.
How to calculate the temperature of the gas at the given condition?Apply the combined gas law equation
P₁ V₁/T₁=P₂V₂/T₂
Put the given values in the equation
38×500/298=76×250/T₂
Hence, the temperature at 250ml and 76kPa will be 298K.
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M → Mt+e
Has M lost or gained an electron?
Answer:
M has lost an electron, one electron, and given it to Mt
Explanation:
The chemical equation below shows the reaction between carbon dioxide (co2) and lithium hydroxide (lioh). co2 2lioh right arrow. li2co3 h2o the molar mass co2 is 44.01 g/mol. how many moles of lioh are needed to react completely with 25.5 g of co2? 0.290 moles 0.579 moles 1.16 moles 1.73 moles
The chemical reaction shows the change that took place in the reaction. The number of moles of LiOH reacted is 1.16 moles.
What is chemical reaction?The term chemical reaction has to do with the combination of two substances to yiled a new one that is different from each of the reactants. From this reaction; [tex]CO2 + 2LiOH ----- > Li2CO3 + H2O[/tex].
Number of moles of CO2 = 25.5 g/44 g/mol = 0.58 moles
Since 1 mole of CO2 reacts with 2 moles of LiOH
0.58 moles reacts with 0.58 moles * 2 moles/ 1 mole
= 1.16 moles
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Answer:
C
Explanation:
Which of the following statements is not true for Coulomb's law?
A.
The force will decrease if the distance is decreased.
B.
The electric force depends partly on the amount of charge.
C.
Doubling one of the charges will double the force if the distance remains constant.
D.
The electric force depends on both amount of charge and distance between them.
Answer:
A
Explanation:
just took the test
The following statements is not true for Coulomb's law is:
A. The force will decrease if the distance is decreased.
Coulomb's law describes the electrostatic force between two point charges. The law states that the force between two charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them.
Mathematically, Coulomb's law is expressed as:
F = k * (|q1| * |q2|) / r²
Where:
F is the electrostatic force between the two charges q1 and q2.
k is Coulomb's constant, a proportionality constant with a value of approximately 8.99 x 10⁹ N m²/C² in a vacuum.
|q1| and |q2| are the magnitudes (absolute values) of the two charges.
r is the distance between the two charges.
Now let's analyze statement A:
A. The force will decrease if the distance is decreased.
This statement is incorrect. According to Coulomb's law, as the distance (r) between the two charges decreases, the force (F) between them increases. The force is inversely proportional to the square of the distance (r²). As the distance becomes smaller, the denominator of the Coulomb's law expression (r²) decreases, causing the force to increase.
Conversely, if the distance between the charges increases, the force between them decreases. The force decreases with the square of the distance.
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Determine the electronegativity difference (AEN) and the type of bond formed
(ionic, polar, non-polar).
CF4
the electronegativity difference (AEN):
<0.5: covalent (non polar)
0.5- 1.7: covalent (polar)
> 1.7 : ionic
CF₄
C = 2.5
F = 4
F - C = 4 - 2.5 = 1.5 (covalent polar)
NH₃
N = 3
H = 2.1
N - H = 3 - 2.1 = 0.9 (covalent polar)
Which of the following mixtures is not a colloid? gradpo!nt
paint
milk
fog
sugar water
Milk
Explanation:
because milk is very thick youknow here I go
explain the difference between weathering and erosion.
Answer:
So, if a rock is changed or broken but stays where it is, it is called weathering. If the pieces of weathered rock are moved away, it is called erosion.
Identify the gas law that applies to the following scenario: You and your family are taking a road trip that starts at your home (at sea level = 1 atm) and takes
you up a mountain. As you drive higher into the mountain, the chip bags you brought as a snack begin to pop.
Avogadro's Law
Gay-Lussac's Law
O Charles Law
Boyle's Law
Identify the group numbers of the following elements: a) noble gases b) alkali metals c) alkaline earth metals d) halogens
Answer:
noble gases: 18
alkali earth: 2
alkali: 1
halogens: 17
Identify the limiting reactant when 32. 0 g hydrogen is allowed to react with 16. 0 g oxygen
Answer:
Oxygen is limiting reactant
Explanation:
2 H2 + O2 ======> 2 H2 O
from this equation (and periodic table) you can see that
4 gm of H combine with 32 gm O2
H / O = 4/32 = 1/8
32 /16 = 2/1 shows O is limiter
for 32 gm H you will need 256 gm O and you only have 16 gm
Aerosol cans must be kepts below 56 degrees celsius or there is a chance they could explode. Which gas law can be used to explain why this might happen
what noble gas configuration does oxygen achieve when bonded?
Answer:
1s2 2s2 2p6
Explanation:
ththe noble gas config. of neon
Nuclear reactions can be written out in equation form with information about the nuclei that take place in the fusion reaction and the nuclei that are produced. In one to two sentences, explain how you would identify the reaction as fusion, and give two different criteria?
SOMEONE HELP ME!!!
Nuclear fusion involves the combination of two light nuclei to form a heavier nucleus with emission of energy.
A nuclear reaction equation is a representation of the change that takes place as one nucleus is converted to another. A nuclear transformation could be any of the following;
Nuclear fissionNuclear fusionTransmutationWe can know that a nuclear fusion is taking place when two nuclei come together to form a larger nucleus and emit energy. I would identify a nuclear fusion when;
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How to do chemistry I’m not sure?
Answer:
Chemistry is like the process or art containing a very broad range of things. From experimenting to the scientific table, with science and chemistry, the possibilities are endless. Who knows, you may even be able to make a new discovery.
To do chemistry, it is about experimenting, studying, and understanding.
What volume of o2 is needed to react fully with 720. Ml of nh3
Ammonia undergoes combustion with oxygen to produce nitric oxide and water. The volume of the oxygen required to react with 720 ml of ammonia is 900 ml.
What is volume?Volume is the area occupied by the substance and is the ratio of the mass to the density.
At STP, 1 mole of gas occupies 22.4 L of volume
Given,
Volume of ammonia reacted = 0.720 L
The combustion reaction is shown as,
[tex]\rm 4NH_{3} + 5O_{2} \rightarrow 4NO +6H_{2}O[/tex]
From the stoichiometry of the reaction, it can be said that,
[tex](4 \times 22.4)[/tex] L of ammonia reacts with [tex](5 \times 22.4)[/tex] L of oxygen gas.
So, 0.720 L of ammonia will react with:
[tex]\dfrac{ (5 \times 22.4)}{(4 \times 22.4)} \times 0.720 = 0.9 \;\rm L[/tex]
Therefore, the volume of oxygen required is 900 mL.
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Greenhouse gases and most other pollutants are typically concentrated in which of the following regions
Answer:
Troposphere - I think
Which is a liquid that is used to absorb and release thermal energy?
coolant
lubricant
grease
fuel
Answer:
grese
Explanation:
Any liquid could absorb and release thermal energy. However, a refrigerant or a coolant absorbs heat and releases it to any area faster than any ordinary liquid such as water. So to complete the sentence: A refrigerant/cooler is a liquid that absorbs and releases thermal energy
Answer:
Coolant
Explanation:
Every liquid does that but
Coolant does it the fastest
Draw the lewis structure for a hydrogen fluoride hf molecule
The Lewis structure of HF comprises the sharing of valence electrons of hydrogen and fluorine.
What is Lewis structure?The Lewis structure is given as the sharing of the electrons between the molecules in the form of the dots. The valence electrons in the sample are represented to be shared between the two atoms forming the compound.
The Lewis structure of HF is given in the image attached.
The hydrogen has 1 and fluorine has 7 valence electrons that are shared between the two atoms in the Lewis structure.
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The Lewis structure of HF comprises the sharing of valence electrons of hydrogen and fluorine.
The Lewis structure is given as the sharing of the electrons between the molecules in the form of dots. The valence electrons in the sample are represented to be shared between the two atoms forming the compound.
The Lewis structure of HF is given in the image attached.
Hydrogen has 1 and fluorine has 7 valence electrons that are shared between the two atoms in the Lewis structure.
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A student wanted to save a recording of a song they created while playing the piano. the most reliable way to store the song would be to use a/an
The most reliable way to store the song would be to muse a digital storage system.
What is a Digital storage system?This is a device which is used to store files or other digital information made by people.
The advantage of this device is that it's safer and can be easily retrieved at any point in time.
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Of the four gases shown in the chart, which do you think contributes the most to the greenhouse effect? Cite data from the chart to support your answer.
Greenhouse gases are the gases that trap heat in the atmosphere of the earth. Methane is the greenhouse gas that contributes most to the greenhouse effect.
What is the greenhouse effect?The greenhouse effect is the process due to the greenhouse gas that entraps the heat and sun rays from the sun that increases the temperature of the atmosphere.
The methane gas is found as 180th million in 1 percent and lives around 25 years in the atmosphere also has 25 more strength than carbon dioxide. Methane is found as natural gas and is a potent greenhouse gas.
Therefore, methane contributes most to the greenhouse effect.
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