Answer:
141.0g of H2SO4
Explanation:
2 mole of NaOH reacts with 1 mole of H2SO4 completely
NaOH = 23 + 16 + 1 = 40g/mol
2 mole = 40g/mol x 2 mol = 80g
H2SO4 = 2(1) + 32 + 4(16) = 98g/mol
1 mole = 98g/mol x 1 mol = 98g
80g reacts with 98g completely
80g ------------ 98g
115g ------------ x
80x = 115 x 98
80x = 11270
x = 11270/80
x = 140.875g
x is approximately 141g
Therefore 115g of NaOH will react completely with 141g of H2SO4
How many moles is 2.80 × 1024 atoms of silicon? A. 4.65 mol B. 0.465 mol C. 2.15 mol D. 6.02 mol
Answer:
A) 4.65mol
Explanation:
[tex]\frac{2.80x10^{24}atoms }{1} *\frac{1 mol}{6.02x10^{23}atoms } =4.65mol[/tex]
Which equation below is an example of a single-replacement reaction?
A.6CO2(g) + 6H2O(l) → C6H12O6(aq) + 6O2(g)
B.H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l)
C.Ca(OH)2(s) Δ→ CaO(s)+ H2O(l)
D.Zn(s) + 2HCl(aq)→ ZnCl2(aq) + H2(g)
The equation that depicts a single replacement reaction would be: Zn(s) + 2HCl(aq)→ ZnCl2(aq) + H2(g)
Single replacement reactionsThey are also known as single displacement reactions.
They are reactions in which one element takes the place of another in a compound. That is, one element replaces another in a compound.
Looking at all the reactions from A - D, one can see that the only reaction that exemplifies a single replacement reaction is D.
Here, Zn replaced H in HCl.
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35 points!!! please help me
Answer:
give answer of following questions and get 35 points.
Q1: What are some similarities in the way these insects produce sounds and the way instruments produce sounds?
Animals can produce sound by vibration of air in their vocal chords as in flutes and trumpets.
Animals can also produce sound by clicking body parts together as cymbals and tambourine.
What is sound?Sound is a form of energy that produces a vibration of air particles which can be heard by the ear.
Sound can either be produced by
wood,wind ,string,brass or percussion instruments.Animals such as dogs produce sound be making are to vibrate in their vocal chords as in wind instruments like trumpets and flutes.
Animals such as some birds can also produce sound by clicking body parts together just as in cymbals and tambourine.
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What is the percentage of oxygen in carbon dioxide?.
Answer:
72.7%
Explanation:
The first thing you need to do here is to figure out the mass of oxygen in
1 mole of carbon dioxide. To do that, you must use the compound's molar mass.
Now, carbon dioxide has a molar mass of 44.01 g mol−1. This means that 1 mole of carbon dioxide has a mass of 44.01 g. Oxygen has a molar mass of 16.0 g mol−1, so 1 mole of oxygen atoms has a mass of 16.0 g.
This means that if you take 44.01 g of carbon dioxide, you know for a fact that it will contain: 32g oxygen.
This means that 100 g of carbon dioxide will contain:
100gCO2 × 32gO2 / 44.01gCO2 = 72.7 g Oxygen
Therefore, carbon dioxide has a percent composition of 72.7% oxygen, i.e. for every 100 gof carbon dioxide you get 72.7 g of oxygen.
50 points
PLEASE HELp this dropped most of grade but I don’t understand at all
Answer:
that number formula units of mole that meansis You need to learn it on Yt
Example:
There are 6.022×1023 in 1 mole of anything, including formula units. You need to determine the number of moles in 0.335 g CaO . Once you know the number of moles of CaO , you can determine the number of formula units by multiplying the number of moles by 6.022×1023
Why are the orbits of planets only nearly circular and not perfectly circular?
Answer:
As the planets mass distribution around the sun changes, the point which the planets orbit changes slightly, disrupting any circular orbits
Explanation:
Answer:
because postulates that the force of gravity weakens as the square of the distance between the two objects
Explanation:
pls mark as brailliest
One mole of gas at STP occupies a volume of
a 22.0L
b 20.0L
c 224
d 25.0 L
Answer: 22.4 L
Explanation:
the constant for one mol of gas at STP is always 22.4 L and this constant is used in equations when converting from L to mol or mol to L
hope this helps :)
Number of energy levels containing electrons in iodine.
Answer:
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 18
Element: Iodine
Group: 17
No. of electrons/shell: 2, 8, 18, 18, 7
PLease help my imma mark brainlist plsss
Did the chemical reaction absorb or release energy? How do you know?
Answer:
Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.
Someone help out plz?
16. For the reaction below, A) calculate the total bond energy, using the equation: Reactant energy - product energy = total energy.
Answer:
C=C divided by the co effiecient 11 would make the denominator of the photosynthesis equal 11 over 5 making this problem a polywhirl which wouldnt matter in the sense of the quake in energy change so thus making the answer 728 kJ/mol
Explanation: back in my day
A buffered solution has a pH of 7.5. What would happen to the pH if a small
amount of acid were added?
A. The pH would stay at about 7.5.
B. The pH would become less than 7.0.
C. The pH would increase to greater than 7.5.
D. The pH would decrease to 7.0.
For this buffered solution with a pH of 7.5, B. The pH would become less than 7.0.
What is pH?In Science, pH literally means the power of hydrogen ions and it can be defined as a measure of the molar concentration of hydrogen ions in a particular solution. Thus, it is typically used to specify the acidity, neutrality or basicity of any chemical solution.
On a pH scale, a solution with a pH of 7 is neutral while a solution with a pH below 7 is acidic and it's basic (alkaline) when its pH is above 7.
In this scenario, a buffered solution with a pH of 7.5 would become less than 7.0 when a small amount of acid is added to it.
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A 5.00 kg weight is placed on a digital scale. The scale reads 4.98 kg. What
is the error of the scale measurement?
The error of this scale measurement is equal to 0.02 kg.
Given the following data:
Actual measurement = 5.00 kg.Measured value = 4.98 kg.To calculate the error of the scale measurement:
What is measurement?Measurement can be defined as an act (process) through which the weight, size, magnitude or distance traveled by an object or body is taken, especially for the purpose of an experiment.
Mathematically, the error of a scale measurement is given by this formula:
[tex]Error = Actual \;measurement-Measured \;value[/tex]
Substituting the given parameters into the formula, we have;
[tex]Error = 5.00-4.98[/tex]
Error = 0.02 kg.
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If 20 grams of NaF are used to make a 3.0 Liter solution. What is the concentration
(Molarity) of the solution?
7M
0.23 M
0.16 M
62 M
Answer: 0.16 M
Explanation:
molarity is a way to measure the concentration of solutions, the equation is the amount of solute in mol / liter of solution:
mol (solute) / L (solution)
the first thing you want to do is convert grams to moles:
20g NaF • 1 mol
———— = 0.47632464 mol
41.98817 g (molar mass of NaF)
then you just want to follow with the rest of the equation:
0.47632464 mol NaF / 3.0 L = 0.15877488 or 0.16 M (sigfigs)
hope this helps :)
Explain why hydrogen, not sodium, is formed at the cathode.
Answer:
because of its electro affinity
Explanation:
it is electro positive
12 = 3X X =
7X = 57 X =
11X = 27.7 X =
Answer:
1. [tex]x=4[/tex]
2.[tex]x=\frac{57}{7}[/tex]
3.[tex]x=\frac{27.7}{11}[/tex]
Explanation:
Given the following questions:
[tex]12=3x[/tex]
[tex]7x=57[/tex]
[tex]11x=27.7[/tex]
In order to find the answers to these questions, we have to recognize that in order to isolate the variable we need to divide on both sides.
Question one:
[tex]12=3x[/tex]
[tex]\frac{3x}{3} =\div3[/tex]
[tex]12\div3=4[/tex]
[tex]x=4[/tex]
Question two:
[tex]7x=57[/tex]
[tex]\frac{7x}{7} =\div7[/tex]
[tex]57\div7=8.14285714=\frac{57}{7}[/tex]
[tex]x=\frac{57}{7}[/tex]
Question three:
[tex]11x=27.7[/tex]
[tex]\frac{11x}{11} \div11[/tex]
[tex]27.7\div11=2.51818182=\frac{27.7}{11}[/tex]
[tex]x=\frac{27.7}{11}[/tex]
Hope this helps.
Which fatty acids are considered essential fatty acids?.
Answer:
alpha-linolenic acid and linoleic acid
Explanation:
Hope this helps!
Why should we turn of the main switch when there is a short circuit in your home
Explanation:
It is the safest way to shut down a circuit by switching off the main switch. If you haven't switched off the main switch and started directly working on it you are open to all kinds of harm one being electrocuted (since high current flows through the electric circuits due to the short circuit or overloading, the fuse wire heats and melts down) other methods of avoiding being electrocuted after turning the main switch off is by using insulating tools such as tools made of wood.
7. Justify why these ions do not exist under normal conditions.
(a) K2+
(b) 0-
K^+ can not exists because electrons are removed from an inner shell. The ion O^- can not exist because it will have an incomplete octet.
Stability of ionsIons are species that contain a positive or a negative charge. When we consider the electron configuration of ions, we can deduce the stability of the ion.
Let us consider the electron configuration of K^2+ which is 1s2 2s2 2p6 3s2 3p5 which means that the second electron is to be removed from an inner shell which implies greater energy expenditure hence it does not exist.
In the case of O^-, involves the formation of an ion with an incomplete octet which is not possible.
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Question 10(Multiple Choice Worth 5 points)
(04.05 LC)
During which of the following processes would carbon most likely be required?
O Breaking of rocks
O Generation of electricity
O Making of glucose
O Running of cars
I’m lost
Answer:
O Generation of electricity
Explanation:
because the others dont make sense to me and tbh carbon is used everyway and everywhere
How many moles of atoms are in 454 g of lead?
Answer:
207.2
Explanation:
One mole of lead weighs 207.2 g. Thus, number of moles in 454 g of lead is determined by dividing the given mass by atomic mass that is ., 2.19 moles.
What is lead ?Lead is 82nd element in periodic table. It is in 14th group. Lead is classified among non-metals but it is a heavy metal in nature. Lead have many naturally stable isotopes of which two are radioactive.
A substance containing 6.02 × 10²³ atoms is called its one mole. This number is called Avogadro number. Hence, one mole of every elements contains Avogadro number of atoms. The mass of one mole of an element is called its atomic mass.
Atomic mass of lead (Pb) = 207. 2 g/mol
thus, number of moles in 454 g of Pb = given mass/atomic mass
no.of moles = 454 /207.2 = 2.19 moles.
Therefore, the number of moles of Pb in 454 g is 2.19.
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#SPJ2
Pure maple syrup has a high sugar content. Its composition is 70% sucrose (C12H2011). If you heat maple
syrup what will happen to its viscosity?
answer : It will decrease
Answer:
it will decrease
Explanation:
Answer:
A. it will decrease
Explanation:
trust
what is the area of the face of a rectangle crystals that has a widlth (w) measuring 3.4 cm and a length (1) measuring 4.2 cm?
Answer:
14.28 [tex]cm^{2}[/tex]
Explanation:
Multiply length by width to get area: 3.4 x 4.2 = 14.28
The answer will be in units of cm x cm = [tex]cm^{2}[/tex]
Is this correct?? please help
Yes it is but I have to check so wait
List one symbol for an element that forms an oxidation number of
-2?
Answer:
Sulfur
Explanation:
S+2e−→S2−
1)
Create a new species of a plant and an animal that is well-suited
for living in the tundra ecosystem. Make a drawing of each, then
list and describe three characteristics that help each organism
thrive in its environment. Don't forget to name your plant and
animali
An organism that is well-suited for living in the tundra ecosystem should ideally be adapted to cold conditions. These organisms should take advantage of the growing season and survive in low humidity conditions.
What is a tundra ecosystem?Tundra is a special type of ecosystem characterized by low temperatures, a short growing season, and low humidity.
In consequence, any organism (either plant or animal) living in a tundra should exhibit adaptation to these climate conditions.
For example, plants in the tundra are able (i.e., they are adapted) to perform photosynthesis in extremely cold temperature conditions.
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When you measure the temperature of hot soup you're measuring the
Answer:
Amount of Thermal Energy
Explanation:
someone helppp pleaseee
Answer:
Top LineNebula → Average Star → Red Giant → Planetary Nebula → White Dwarf
Bottom LineNebula → Massive Star → Red Supergiant → Supernova → Neutron Star or Black Hole (for the second box)
-TheUnknownScientist 72
Answer:
top- nebula average star, reg giant, planetary nebula, white dwarf
bottom- nebula, massive star, red supergiant, supernova, neutron star-black dwarf
A 6. 0 L container holds a sample of hydrogen gas at 150 kPa. The pressure increases to 2 atm and the temperature remains constant. What will the volume be? 0. 22 L 0. 44 L 2. 26 L 4. 50 L.
The volume of the container will be 0.45L.
What is Boyle's law?This law states that the product of volume and its pressure is constant for any gas.
Given, the Volume 1 of container 6.0L
V2 =?
Pressure 1 is 150 kPa
Increased pressure 2 is 2 atm
Temperature is constant.
By Boyle's law:
P1V1 = P2V2
[tex]150 \times 6 = 2\times V2 = 450[/tex]
Thus, V2 = 0.45 L.
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