[tex]\tt \large{\boxed{\bold{Nt=No.(\frac{1}{2}) ^{\frac{T}{t1/2} } }}[/tex]
Nt/No = 1/8
T = duration of decay
t 1/2 = half-life
[tex]\tt \dfrac{1}{8}=\dfrac{1}{2}^\dfrac{T}{5}}\\\\(\dfrac{1}{2})^3=\dfrac{1}{2}^\dfrac{T}{5}}\\\\3=\dfrac{T}{5}\rightarrow T=15~years[/tex]
Explain the difference between current electricity and magnetism.
Potential energy stored within chemical bonds is called:.
Answer:
Chemical Energy
Explanation:
Energy, Molecules and Chemical Reactions. Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy.
7. Complete the following equations. [2]
a. Sodium + Water ______________________ + Hydrogen
b. Copper carbonate + Sulfuric acid _____________________ +_____________ + Carbon dioxide
c. Sulfur + _________________ Sulfur dioxide
Answer:
Sodium + water --› Sodium hydroxide + hydrogen gas
Copper carbonate + sulphuric acid --› Copper sulphate + water + carbondioxide
Sulphur + Oxygen --› Sulphur dioxide
PLEASE MARK ME BRAINLIEST
Why are water and hydrogen peroxide different substances even though they are both made up of hydrogen and oxygen atoms?
How does the proximity to water affect temperature and precipitation in the tropical, temperate, and polar zones?
written answer
science
Answer:
Water heats and cools more slowly than landmasses.
Explanation:
because the coastal regions will stay cooler in summer and warmer in winter but creating a more moderate climate with a narrower temperature range.
Why is carbon dioxide a necessary part of the atmosphere.
Answer:
it gives plants life and plants give us oxygen
HELP PLS WILL GIVE BRAINLIEST AND THANKS
In a reaction chamber, 3.0mol of aluminum is mixed with 5.3mol Cl2 and reacts. The reaction is described by the following balanced chemical equation.
2Al + 3Cl2 ==> 2AlCl3
a)Identify the limiting reagent for the reaction.
b)Calculate the number of moles or products formed
Answer:
you have school on Sunday?
How long is a hard boiled egg good for in the refrigerator?.
Answer:
Hard-boiled eggs can be preserved up to 7 days in the refrigerator.
Explanation:
NaOH was adde to a 7.75 x 10^-3 M solution of HCl so that the end solution has a pH of 3.500. What is the positive difference in concentration of [H3O+]
Answer:
concentration [H_3O^+][H3O+] decreased by 4.46334\sdot10^{-4}M.4.46334⋅10−4M.
Explanation:
pH=−log[H3O+]; [H_3O^+]=10^{-pH};[H3O+]=10−pH;
If pH=3.350;pH=3.350;
[H_3O^+]=10^{-3.35}=4.467\sdot10^{-4}M;[H3O+]=10−3.35=4.467⋅10−4M;
If pH=6.780;pH=6.780;
[H_3O^+]=10^{-6.78}=1.66\sdot10^{-7}M;[H3O+]=10−6.78=1.66⋅10−7M;
4.467\sdot10^{-4}-1.66\sdot10^{-7}=4467\sdot10^{-7}-1.66\sdot10^{-7}=4465.34\sdot10^{-7}=4.467⋅10−4−1.66⋅10−7=4467⋅10−7−1.66⋅10−7=4465.34⋅10−7=
=4.46534\sdot10^{-4}M;=4.46534⋅10−4M;
The positive difference in concentration of [[tex]H_3O^+[/tex]] is [tex]4.46534 X 10^{-4}M[/tex] when NaOH was added to a 7.75 x [tex]10^-3[/tex] M solution of HCl so that the end solution has a pH of 3.500.
What is concentration?It is the measure of how much of a given substance there is mixed with another substance.
pH=−log[[tex]H_3O^+[/tex]]
[[tex]H_3O^+[/tex]]=[tex]10^{-pH}[/tex]
[[tex]H_3O^+[/tex]]=[tex]10^-^p^H[/tex]
If pH=3.350
pH=3.350
[[tex]H_3O^+[/tex]]=[tex]10^{-3.35}[/tex]=[tex]4.467 X 10^{-4}M[/tex]
[[tex]H_3O^+[/tex]]=[tex]10^{-3.35}[/tex]
=[tex]4.467 X 10^{-4}M[/tex]
If pH=6.780
pH=6.780
[[tex]H_3O^+[/tex]]= [tex]10^{-6.78}[/tex]=[tex]1.66 X 10^{-7}M[/tex]
Hence, the positive difference in concentration of [[tex]H_3O^+[/tex]] is[tex]= 4.46534 X 10^{-4}M[/tex]
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Why do gases behave the least like ideal gases at low temperatures in high pressures
Answer: the interactions that are going on with the intermolecular. And depending how much space their is between each particle.
Explanation: Gases behave the least like ideal gases at low temperatures in high pressures because of the interactions that are going on with the intermolecular. And depending how much space their is between each particle. And whether the sizes are compared to small or large spaces are really insignificant.
Hope this helps :)
Where do Grasshoppers have their ears?
Grasshoppers Have Ears on Their Bellies
Explanation:
Describe the change of state using kinetic theory
Explanation:
According to kinetic molecular theory,changes of the state of matter occur when energy is added or removed from a substance
According to the Kinetic-Molecular Theory, changes of the state of matter occur when energy is added or removed from a substance. The addition of energy makes particles move more, pushing them apart and weakening the bonds between them. Removing energy makes particle movement slow down, re-forming the bonds.
How many atoms are in 12.01 g of C? (Please show the steps! Thank you!)
Answer:
6.02 x 1023
Explanation:
Its numerical value is 6.02 x 10 (23). Therefore, a 12.01 g sample of carbon contains 6.02 x 10 (23) carbon atoms.
If you are given a 0. 32 g piece of sodium metal to react with water, how many moles of hcl would it take to neutralize the sodium hydroxide produced?.
Answer:
.0139
Explanation:
The number of moles of HCl would take to neutralize the sodium hydroxide produced is equal to 0.0139 moles.
What is a neutralization reaction?A neutralization reaction can be defined as a chemical reaction in which an acid and base react with each other to prepare salt and water.
When HCl reacts with NaOH and the resulting salt is sodium chloride and water.
HCl + NaOH [tex]\longrightarrow[/tex] NaCl + H₂O
The chemical reaction, chemical reaction of sodium metal and water gives hydrogen gas and sodium hydroxide:
[tex]2Na+ 2H_2O \longrightarrow 2NaOH + H_2[/tex]
Given the amount of sodium metal = 0.32 g
The moles of sodium metal = 0.32/23 = 0.0139 moles
If the 2 moles of sodium produce sodium hydroxide = 2 mol
The 0.0139 moles of sodium will produce NaOH = 0.0139
Therefore, 0.0139 moles of HCl is required to neutralize 0.0139 moles of NaOH.
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Determine the ph of a 0. 188 m nh3 solution at 25°c. The kb of nh3 is 1. 76 × 10-5.
[tex]\tt [OH^-]=\sqrt{Kb.M}[/tex]
[OH⁻]=√1.76.10⁻⁵.0.188
[OH⁻]=1.81 x 10⁻³
pOH = 3 - log 1.81
pH = 11 + log 1.81
Why does the entropy of a gas increase when it expands into a vacuum?.
Answer:
When a gas expands into a vacuum, its entropy increases because the increased volume allows for greater atomic or molecular disorder. The greater the number of atoms or molecules in the gas, the greater the disorder.
Explanation:
Which of the following ionic compounds has a transition metal in it?
a. KOH
b. Cs2S
c. CuSO4
d. MgCl2
Answer:
Ca2s that is answers and CuSO4is
2. Fe(s) + O2(g) → Fe3O4(s) a. When 13.54 g of O2 is mixed with 12.21 g of Fe, which is the limiting reactant? b. What mass in grams of iron oxide is produced? c. What mass in grams of excess reactant remains when the reaction is complete? d. A student performed completed this reaction in a lab and made15.88 g of Fe3O4, what was their percent yield?
The percent yield shows the extent to which the reactants are converetd into products . The limiting reactant is used up in the reaction.
What is a limiting reactant?A limiting reactant is the reactant that is in the least amount in the system. Now;
Number of moles of Fe = 12.21 g/56 g/mol = 0.22 moles
Number of moles of O2 = 13.54 g/32 g/mol = 0.42 moles
Balanced reaction equation;
3Fe(s) + 2 O2(g) = Fe3O4(s)
If 3 moles of Fe reacts with 2 mole of O2
0.22 moles of Fe reacts with 0.22 moles * 2 mole/3 moles = 0.15 moles
Hence, Fe is the limiting reactant
If 3 mole of Fe produces 1 mole of Fe3O4(s)
0.22 moles of O2 produces 0.22 moles * 1 mole/3 moles of Fe3O4(s) = 0.1073 moles
Mass of Fe3O4(s) =0.1073 moles * 232 g/mol =16.9 g
Number of moles of excess reactant = 0.42 moles - 0.15 moles = 0.27 moles
Mass of excess reactant = 0.27 moles * 32 g/mol = 8.64 g
percent yield = 15.88 g/16.9 g * 100/1
= 93.4%
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Most grasshoppers stridulate to make sounds, what does that mean?
Answer: grasshoppers produce sounds to attract mates or protect territory.
Explanation: Like their cricket cousins, grasshoppers produce sounds to attract mates or protect territory. Grasshoppers can be identified by their unique songs, which differ slightly from species to species. Grasshoppers stridulate by rubbing their wings together in the same manner as crickets.
Explain the difference between current electricity and magnetism.
Answer:
Electricity can be present in a static charge, while magnetism's presence is only felt when there are moving charges as a result of electricity. In simple words, electricity can exist without magnetism, but magnetism cannot exist without electricity.
HOPE THIS HELPS, HAVE A GREAT DAY!!~
Explanation:
Which is a warning sign that someone needs the help of a mental health professional?
A.
feeling shy when asked to walk onstage
B.
overeating to increase bodily strength
C.
inablity to sleep properly for weeks
Answer:
The answer is C. Inability to sleep properly for weeks.
Explanation:
This means that your mental health is going downhill because the lasck of sleep can drive you insane.
Hope This Helps!
-Justin:)
A ____________ is required to transfer dna sequences from one organism to another.
genomic library
genetic probe
vector
restriction endonuclease
reporter gene
5
Julia made a model of a cell in a clear plastic zipper bag. She used a marble for the nucleus and pinto beans for mitochondria.
Which of the following options would be best for making her model more like a plant cell?
A. Take the marble out of the bag.
B. Put the bag inside a clear plastic box.
c. Take the pinto beans out of the bag.
D. Put the bag inside a larger clear plastic bag.
Reset
Submit
The option that would be best for making Julia model look more like a plant cell is putting the bag inside a larger clear plastic bag.
What is a cell?A cell is the basic and functional unit of life. Every living organism is made up of one or more cells.
However, a plant cell is morphologically different from an animal cell. One of the major differences is that a plant cell posseses a cell wall that protects the cell.
According to this question, Julia made a model of a cell in a clear plastic zipper bag. She used a marble for the nucleus and pinto beans for mitochondria.
Therefore, the option that would be best for making Julia model look more like a plant cell is putting the bag inside a larger clear plastic bag which will represent the cell wall.
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What is due to acids formed when atmospheric and volcanic gases mix with water. question 2 options: chemical weathering mechanical weathering root-pry pedalfer
Chemical weathering formed is due to acids formation when atmospheric and volcanic gases mix with water.
What is chemical weathering?Chemical weathering is a type of weathering that involved weakening and disintegration of rock by chemical reactions like acid reactions and so on. These reactions include oxidation, hydrolysis, and carbonation. These processes lead to formatiom or destruction of minerals, thus changing the nature of the rock's mineral composition.
Therefore, Chemical weathering is due to acids formed when atmospheric and volcanic gases mix with water.
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Neon and argon are both in Group 18 of the periodic table. Which property do they most likely share (
O silver color
O strong odor
O metallic texture
O low or no reactivity
Explanation:
low or no reactivity ....
Neon and argon are both in Group 18 of the periodic table. The property that they are most likely to share is low or no reactivity. The correct option is d.
What are argon and neon?A chemical element found in the periodic table is argon. It is the third most common gas in the atmosphere and has an atomic number of 18.
In the periodic table, neon is a chemical element. It is a monatomic, noble gas with the atomic number 10 that is found in the environment.
Although a few liquid molecules do rise to the top, the vast majority stay close to the bottom. Furthermore, the molecules in the gas phase move more swiftly than those in the liquid phase.
Therefore, the correct option is d, low, or no reactivity regarding the mutual property of argon and neon.
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Which of the following statements is true of these two cells?
A.
Nerve cells do not look like skin cells because they make up different organs and have different functions.
B.
Nerve cells do not look like skin cells because they contain completely different DNA within the same organism.
C.
Nerve cells and skin cells are identical to one another in appearance and function.
D.
Nerve cells and skin cells appear different from each other, but they have identical functions.
The true statements is that nerve cells do not look like skin cells because they make up different organs and have different functions.
What are cells?Cells are the basic functional and fundamental unit of any living organism.
Each and every cells that are present inside the body have same DNA, but they all have different function and different structures. As nerve cells are present only in the brain and spinal cord part and skin cells are present all over the body.
Hence both the cells are different as they have different functions.
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Which of the following describes carbohydrates?
Answer:
They are converted into glucose, they are a source of energy for the body
Explanation:
that's the answer
Write down the structural formula for the monomer from which
polyvinyl chloride is derived.
The monomer from which the very common commercial polymer poly vinyl chloride is vinyl chloride with the formula, CH₂Cl = CH₂Cl. The PVC is formed by addition polymerization.
What is polymerization ?Polymerization is the process of combination of smaller molecules or compounds in large number to form macromolecules or polymers. There are a lot of polymers that we are using daily in the form of bags, plastics, bottles etc.
Among the common polymers we use PVC or poly vinyl chloride is very essential commercial polymer. The monomer of PVC is vinyl chlorides.
The polymerization of n vinyl chloride to form polyvinyl chloride is given below.
[tex]\rm n CH_{2}Cl = CH_{2}Cl \rightarrow (-CH_{2}Cl - CH_{2}Cl -)__{n}[/tex]
The polymerization of vinyl chloride is taking place through addition mechanism. The vinyl chloride monomer repeatedly add one by one to form the polymer.
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What is the definition of genetic trait
The genetic constitution of an individual, group, or class.
Explanation:
transmission of mechanisms of inherited characteristics of organisms
Answer:a trait that can be passed down is within your gens Evan if you don’t show the trait you still have the ability to pass it down
Explanation:
At what minimal temperature is the following reaction, the reduction of magnetite by graphite to elemental iron, spontaneous?
Fe3O4(s)+2C(s,graphite)→2CO2(g)+3Fe(s)
The values of enthalpy change, entropy change and temperature all determine the spontenity of a reaction.
What is a sponteanous reaction?A sponteanous reaction is one which has the change in free energy as negative. We know that ΔG = ΔH - TΔS. The spontenity of a reaction depends on;
i. enthalpy change
ii. entropy change
iii. temperature
Since the values in the qestion are not given, the question is incomplete and we can not obtain a numerical value in order to decide the sponteanity of the reaction.
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