Answer:
okay....
Explanation:
technically, fish do not have wings. they are called fins and they are used for the purpose of transportation, just as legs are for humans.
~Ren
what is meant by votalite in chemistry
Answer: This may help you
https://ay.live/BNNBhX
Explanation:
Anyone knows the answer?
Answer:
No I do not but did you know that you can save 15 or more on car insurance by switching to geico?
Explanation:
A 60.0 mL sample of nitrogen is warmed from 350 K to 400 K. Find its new volume if the pressure remains constant.
0.0145 ml
52.50 ml
0.0191 ml
68.57 ml
yes
Answer:68.57
Explanation:
If a sample originally had 410 atoms of carbon-14, how many atoms will remain after 16,110 years?
Answer:
58.4 atoms
Explanation:
To find the remaining amount of atoms, you need to use the half-life formula:
[tex]A = A_0*(\frac{1}{2})^{\frac{t}{h}[/tex]
In this formula,
-----> A = remaining amount (atoms)
-----> A₀ = initial amount (atoms)
-----> t = time passed (years)
-----> h = half-life (years)
The half-life is the amount of time that needs to pass for the initial amount of a substance to decay by 50% (or 1/2). According to the graph, 50% of the initial substance is left after 5,730 years.
A = ? atoms t = 16,110 years
A₀ = 410 atoms h = 5,730 years
[tex]A = A_0*(\frac{1}{2})^{\frac{t}{h}[/tex] <----- Half-life formula
[tex]A = 410*(\frac{1}{2})^{\frac{16,110}{5,730}[/tex] <----- Insert values
[tex]A = 410*(\frac{1}{2})^{2.81[/tex] <----- Divide 16,110 by 5,730
[tex]A = 410*0.142[/tex] <----- Raise [tex]\frac{1}{2}[/tex] to 2.81
[tex]A = 58.4[/tex] <-----Multiply 410 and 0.142
Which of Earth’s spheres do humans impact and how?
You will get a free foot if you answer this
Answer:
humans have a huge impact on all spheres. if you negatively impact the spheres, such as burning fossil fuels, it'll pollute the atmosphere.
Explanation:
All four spheres of Earth are susceptible to human influence. Burning fossil fuels can cause pollution to be released into the atmosphere. Garbage accumulated by humans in landfills has an impact on the geosphere. Human waste enters waterways and has an effect on the hydrosphere.
What is geosphere ?Different definitions of the geosphere have conflicting uses. It can be used to refer to the atmosphere, lithosphere, hydrosphere, and cryosphere as a whole. Different mass and/or energy flows can be exchanged between the various geosphere collectives.
Land erosion and soil movement currently result from human activity more frequently than from any natural mechanism. Human-caused air and water pollution has a negative impact on the environment, rivers, and lakes, harming both other animals and people's health.
According to some scientists, humans have their own sphere, the "anthrosphere." But for the purposes of this module, people will also be considered a component of the biosphere.
Thus, Garbage accumulated by humans in landfills has an impact on the geosphere.
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A gas mixture contains 0.800 mol of N2, 0.200 mol of H2, and 0.150 mol of CH4. What is the mole fraction of H2 in the mixture?
Answer:
0.1739
Explanation:
0.800 mol of N2
0.200 mol of H2
0.150 mol of CH4
Total moles of the mixture = 0.8 + 0.2 + 0.150 = 1.150 mol
Mole fraction of H2 = Number of moles of H2 / Total moles
Mole Fraction = 0.2 / 1.150 = 0.1739
Calculate the mass percent of hydrogen in CH3OCH3. Answer in 2 decimal places without unit.
The answer will be 13.02 % of hydrogen.
Mass Percentage : It is used to estimate the mass % of an element in a compound.
CH3OCH3 - chemical name is dimethyl ether also known by the name of methoxymethane.
It is an organic compound.
Also is an isomer of an ethanol.
There are 6 molecules of Hydrogen present in CH3OCH3
So, mass percent of hydrogen = Total number of molecules present in the compound *100 / Molecular weight of the compound
= 6 *100 / Molar mass of CH3OCH3
= 600 / 46.07 = 13.02 %
So, the mass percentage of hydrogen in C2H6O will be 13.02 %
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What is the standard cell potential for a voltaic cell using the Pb2 /Pb and Mg2 /Mg half-reactions and which metal is the cathode
Answer:The standard cell potential, E˚cell =2.234 V, Pb metal is the cathode.
Explanation:
The Half cell reactions are
Pb2+(aq) + 2e– > Pb(s) ------E˚ = –0.136 V
Mg2+(aq) + 2e–>Mg(s)------- E˚ = –2.37 V
In a voltaic cell, reduction occurs at the cathode and oxidation occurs at the anode
Mg(s)---->Mg2+(aq) + 2e– ( anodic oxidation)
Pb2+(aq) + 2e----> Pb(s) ( Cathodic reduction)
We can see that Mg has a more negative reduction potential value leading to having a low reduction potential and therefore will occur at the anode since it will be oxidized. On the other hand Pb2+ has a less negative reduction potential and therefore will have a high reduction making it to occur at the cathode and be reduced
Using The standard cell potential, E˚cell = E˚cathode – E˚anode
E˚cell = –0.136 - (–2.37)
E˚cell=2.234 V
What is the relationship between KMT and Sea Level Rise?
Relationship between KMT and Sea Level Rise because sea level rise in KMT with distance of 760nm
KMT is described as the behavior of gases and also it is used to explain macroscopic properties of a gas such a pressure and temperature and sea level rise is an increase in the level of the world oceans due to the effects of global warming and burning fossil fuels is one of the causes of global warming because it releases carbon dioxide and other heat-trapped gasses into the atmosphere so here the relationship between kinetic molecular theory and sea level rise is distance between sea level and KMT is 760nm sea level is rise because gas level is is increases.
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Drag the text elements below into the gray boxes to create an equation that calculates the mass of CH, required to create 24.0 g of H₂O.
The mass of CH₄ required to create 24.0 g of H₂O is 10.67 g
Balanced equationCH₄ + 2O₂ -> CO₂ + 2H₂O
The following were obtained from the balanced equation:
Molar mass of CH₄ = 12 + (1 × 4) = 16 g/mol Mass of CH₄ from the balanced equation = 1 × 16 = 16 gMolar mass of H₂O = (2 × 1) + 16 = 18 g/mol Mass of H₂O from the balanced equation = 2 × 18 = 36 gFrom the balanced equation above,
36 g of H₂O were produced from 16 g of CH₄
How to determine the mass of CH₄ requiredFrom the balanced equation above,
36 g of H₂O were produced from 16 g of CH₄
Therefore,
24 g of H₂O will be produced from = (24 × 16) / 36 = 10.67 g of CH₄
Thus, 10.67 g of CH₄ is needed for the reaction
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Complete question:
See attached photo
Every neutral atom of a given element has the same number of what two subatomic particles?
A. Protons and neutrons
B. Protons and electrons
Answer:
protons and electrons
Explanation:
because two atoms of the same elements have different(mass)isotope so the answer is B
How are alloys made?
Answered
A student wants to measure the temperature of a solution. The student
takes 10 measurements and determines that the temperature is about 24.6 degrees celsius. If the true temperature is 24.3 degrees celsius, what is the absolute error in the measurement?
Answer:
0.3 or 0.30
Explanation:
The discrepancy between a quantity's measured or inferred value and its actual value is known as the absolute error. The absolute error is insufficient because it provides no information about the significance of the error. The absolute error is -0.3.
An important component of scientific calculations is measurement. Results from measurements that are entirely correct are incredibly unusual. Small mistakes are frequent while monitoring various metrics. Different kinds of errors result in variations in measurement. Mathematical equations can be used to express all faults.
The difference between a quantity's measured value and actual value is used to compute the absolute error. The absolute error is written as, if the measured value is x and the actual value is x₀.
∆x = x₀- x
∆x = 24.3 - 24.6
∆x = -0.3
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The net ionic equation for the dissolution of zinc metal in aqueous hydrobromic acid is ________.
Answer:
[tex]Zn(s)+2H^+(aq)\rightarrow Zn^{2+}(aq)+H_2(g)[/tex]
Explanation:
Hello!
In this case, since writing the net ionic equation implies the complete molecular equation, we should start by:
[tex]Zn(s)+2HBr(aq)\rightarrow ZnBr_2(aq)+H_2(g)[/tex]
Next, we represent the ionization of the aqueous species:
[tex]Zn(s)+2H^+(aq)+2Br^-(aq)\rightarrow Zn^{2+}(aq)+2Br^-(aq)+H_2(g)[/tex]
Whereas the spectator ions, those at both reactants and products are cancelled out so the net ionic equation is obtained:
[tex]Zn(s)+2H^+(aq)\rightarrow Zn^{2+}(aq)+H_2(g)[/tex]
Best regards!
Why is Hydrogen-2 a heavier isotope than Hydrogen-1?
A. Hydrogen-2 has one more proton
B. Hydrogen-2 has one more neutron
Answer:
It is A. hydrogen -2 has one more proton
how do you do stoichiometry
suppose we have a reaction as follows :
nA + mB ---> pC + qD
where n,m,p,q are natural numbers
these natural numbers are called stoichiometric coefficients .
Eg:
2P + 3Br2 ---> 2PBr3
here, 2, 3 from reactant side and 2 from product side are called stoichiometric coefficients
hope this helps...
A formula that relates the amount of a substance to a mass?
Explanation:
A formula mass of substance is a sum of the average atomics masses of each atom represented in the chemical formula and is expressed in atomic mass units.the formula mass of covalent compound is also called the molecular mass
Zinc (Zn) can be described as a bluish-white metal that is brittle at room
temperature, conducts heat and electricity, and burns in air.
Which of the following is a chemical property of zinc?
A. Zinc is brittle at room temperature.
B. Zinc burns in air.
C. Zinc is bluish-white.
D. Zinc conducts heat
Answer:
B. Zinc burns in the air.
Explanation:
A chemical property of an element is known as the property of that specific element that is apparent or visible when the element has gone through a chemical reaction with other substances or elements under investigation.
In this case, the correct answer is option B which is " Zinc burns in the air" because it shows zinc to react chemically with air which then changes its properties.
The others are just physical properties of zinc
You dissolved a small amount of your product in about 5 mL of distilled water in a test tube. You then added about 1 mL of 6M HCl solution and finally you heated the final solution. What precipitate formed in the test tube?
Answer:
Sulfur
Explanation:
The reaction of the following question is as follows:
Na₂S₂O₃ (aq) + 2HCl(aq) --------------⇒2NaCl (aq) + H₂O(l) + SO₂(aq) + S (s)
Precipitate is sulfur.
Calculate the pHpH of a 0.10 MM solution of HClHCl . Express your answer numerically using two decimal places.
Answer: The pH 0f 0.10 solution of HCl is 1.00
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
[tex]HCl\rightarrow H^++Cl^{-}[/tex]
According to stoichiometry,
1 mole of [tex]HCl[/tex] gives 1 mole of [tex]H^+[/tex]
Thus [tex]0.10[/tex] moles of [tex]HCl[/tex] gives =[tex]\frac{1}{1}\times 0.10=0.10[/tex] moles of [tex]H^+[/tex]
Putting in the values:
[tex]pH=-\log[0.10][/tex]
[tex]pH=1.00[/tex]
Thus pH 0f 0.10 solution of HCl is 1.00
When 35.0 mL of 0.400 M hydrochloric acid and 35.0 mL of 0.400 M sodium hypochlorite are combined, the pH of the resulting solution will be :
Answer:
pH = 7.49
Explanation:
This is a buffer solution. We can apply Henderson Hasselbach equation:
pH = pKa + log ((total mmoles - mmoles HCl) / mmoles HCl)
We have the same amount of mmoles.
35 mL . 0.400 M = 14 mmoles HCl
35 mL . 0.400 M = 14 mmoles NaClO
Total moles are 28 mmoles.
We replace data:
pH = pKa + log ((28 mmoles -14 mmoles) / 14 mmoles)
Notice that the relation in log = 1. So pH = pKa
pKa for HClO is 7.49
When pH = pKa we have the same amount of base and acid. Notice, that we have the same mmoles of HCl and NaClO.
Remember that a buffer can be prepared with:
a) A weak acid and its conjugate base (acetic /acetate)
A weak base and its conjugate acid (ammonia/ammonium)
b) A weak acid with a strong base, where the acid can be in excess.
c) A conjugate base (salt from weak acid) with a strong acid, where the base can be in excess. (This case but, the base is not in excess, that's why ph = pKa)
Name two elements that have similar properties based on their groupings in the periodic table.
A. Li and O
B. Na and Li
C. B and Cl
D. O and Cl
Answer:
B. Na and Li
Explanation:
Only lithium and Sodium will have similar properties based on their groupings in the periodic table.
The periodic table of elements shows the arrangement of elements based on their atomic number.
As general rule, elements in the same group on the periodic table will have the same chemical propertiesThis is because they have the same number of valence electrons. Valency of an atom determines the chemical properties of such atom.There’s bots who create questions and then suddenly get a response and there’s me who waits hours for a response. Lol really nice
If anyone can answer this I will make you brainiest.
The____ of a gas solute determines whether or not that gas will dissolve in a solvent.
What makes a solution saturated?
Answer:
maximum amount of solute that is capable of being dissolved
Answer: A solution that contains a maximum amount if solute that is capable of being dissolved
Explanation:
A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved.
Calculate the density (in g/mL) of an object that has a mass of 3.81 g and a volume of
14.3 mL.
Answer:
Density = M/V
so 3.81/14.3 .266g/ml
Explanation:
HelapPPPpPPPPpThe three states of matter that may change during a physical change are O atoms, molecules, electrons O color, shape, size O solid, liquid, gas
Answer:
Solid liquid and gas
Explanation:
On the periodic table, Nitrogen has 7 what?
Answer:
[tex]\boxed {\boxed {\sf 7 \ protons}}[/tex]
Explanation:
On the Periodic Table, Nitrogen is:
A nonmetalIn group 15 and period 2 With an atomic mass of 14.007 amu With the atomic number 7In elements, their atomic number is also equal to the number of protons. As the number of protons in an atom change, so does the identity of the atom.
Since nitrogen has an atomic number of 7, it must always have 7 protons
Do the following math operation and report your answer to the
correct number of significant digits.
10.000-9.768/5.78
The following math operation and report your answer to the
correct number of significant digits is. 4.013×10^-2
now we have given 10.000-9.768/5.78,
we have to find correct significant digits
10.000-9.768 ÷5.78
=0.232÷5.78
=0.04013, it has 4 significant figure
we have to write in significant digit
so 0.04013 = 4.013×10^-2
Instead of expressing the magnitude of a measured number, significant figures or digits do so. The last digit, whose value is only roughly known, and the number of precisely known digits together make up the important figures, according to scientific tradition.The laws of arithmetic, addition, subtraction, multiplication, and division, are used to calculate any measurement because the significant figures represent numbers. Because any measurement is calculated by compounding two or more variables, these calculated results may have been measured with varying degrees of accuracy and are inevitably flawed.To know more about significant digit
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I need help with this question
Answer:
kajjajjanwjsjjsjsjsjsjjsjsj
Explanation:
jqqjjqj
What mass of N2 will be needed to produce 31.5 grams of N2O5?
4N2 + 502 --> 2N2O5
a) 158.3 grams
b) 38.64 grams
c) 4.96 grams
d) 16.34 grams
Answer: d) 16.34 grams
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} N_2O_5=\frac{31.5g}{108.01g/mol}=0.292moles[/tex]
[tex]4N_2+5O_2\rightarrow 2N_2O_5[/tex]
According to stoichiometry :
As 2 moles of [tex]N_2O_5[/tex] are produced by= 4 moles of [tex]N_2[/tex]
Thus 0.292 moles of [tex]N_2O_5[/tex] are produced by= =[tex]\frac{4}{2}\times 0.292=0.584moles[/tex] of [tex]N_2[/tex]
Mass of [tex]N_2=moles\times {\text {Molar mass}}=0.584moles\times 28g/mol=16.34g[/tex]
Thus 16.34 g of [tex]N_2[/tex] will be needed