Answer:
4.88 x 10²⁴atoms
Explanation:
Given parameters:
Number of moles of oxygen = 8.1moles
Problem:
To find the number of atoms in 8.1moles of oxygen.
Method in solving the problem:
We know that a mole of a substance contains Avogadro’s number of particles which is 6.02 x 10²³
The particles can be molecules, atoms, etc.
Solution:
From the concept of mole,
Number of atoms =
number of moles x 6.02 x 10²³
Number of atoms = 8.1 x 6.02 x 10²³
Number of
atoms of oxygen = 48.8 x 10²³ atoms
= 4.88 x 10²⁴atoms
Which best describes the error in data collection
Answer:
Error (statistical error) describes the difference between a value obtained from a data collection process and the 'true' value for the population. The greater the error, the less representative the data are of the population. Data can be affected by two types of error: sampling error and non-sampling error
Explanation:.
Answer:
The correct answer is the standard deviation of the sample distribution.
Explanation:
The standard error is the standard deviation of the sample distribution of a sample statistic. The term also refers to an estimate of the standard deviation, derived from a particular sample used to compute the estimate. The larger the error, the less representative the population data. Data can be affected by two types of error: sampling error and non-sampling error.
Have a nice day!
Find out Oxidizing and Reducing agent in the following REDBOX REACTIONS.
Answer:
Fe is the reducing agent while oxygen is the oxidizing agent
Explanation:
In the reaction above Iron loses electrons to form iron ions and this is called oxidation. Therefore, iron is the reducing agent which loses electrons and becomes oxidized to form Iron(iii) ion.On the other hand, Oxygen gains or accepts electrons and therefore, it undergoes reduction. This means oxygen is the reducing agent that accepts electrons and becomes reduced to oxygen ion.hich statement is true? A. An acid with a large pKa will be a better conductor of electricity than one with a smaller pKa. B. An acid with a large pKa will be less corrosive than one with a smaller pKa. C. An acid with a large Ka will be a poorer conductor of electricity than one with a smaller Ka. D. An acid with a large Ka will be less corrosive than one with a smaller Ka. E. An acid with a large Ka will taste less sour than an acid with a smaller pKa.
Answer:
[tex]\boxed{\text{B is correct}}[/tex]
Explanation:
Kₐ and pKₐ are measures of the strength of an acid. For example,
HX + H₂O ⇌ H₃O⁺ + X⁻; Kₐ = 10¹⁰, pKₐ = -10
HA + H₂O ⇌ H₃O⁺ + A⁻; Kₐ = 10⁻¹⁰, pKₐ = 10
HX is a strong acid, because it has a larger Kₐ, that is, the position of equilibrium lies far to the right.
However, pKₐ is the negative logarithm of Kₐ, so HX has the smaller pKₐ.
Similarly, Ha is a weak acid, but it has the larger pKₐ.
Strong acid: Large Kₐ ⇔ Low pKₐ
Weak acid: Small Kₐ ⇔ High pKₐ
A is wrong. HA is a weak acid, so it produces only a few hydronium ions.
B is correct. The rate of corrosion depends on the concentration of hydronium ions. HA is a weak acid, so it is less corrosive than an acid with a small pKₐ.
C is wrong. HX is a strong acid, so there are more ions to carry the current. HX will be a good conductor of electricity.
D is wrong. HX is a strong acid, so it provides more hydronium ions and is more corrosive.
E is wrong. HX is a strong acid, so it provides more hydronium ions to stimulate the taste buds.
[tex]\boxed{\textbf{B is correct}}[/tex]
5.01 moles of magnesium phosphate contain how many atoms of phosphorus?
Answer:
Explanation:
Deal with 1 mole first.
The chemical formula of Magnesium Phosphate is
Mg3(PO4)2
The 2 tells you that there are 2 mols of Phosphorus in the chemical.
1 mol of anything is 6.02 * 10^23 (in this case) atoms.
2 mols of anything is 12.04 * 10^23 atoms
2 moles of anything is 1.204 * 10^24 (the 2 answers are the same. This one is more correct in scientific notation.)
Now we come to the 5.01. Where does that go?
5.01 * Mg3(PO4)2
So multiply 1.204 * 10^24 by 5.01 When you do, you get
7.26 * 10^24 atoms
The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(gi°C), how much heat is absorbed by the reaction? Use . 140 J 418 J 1,470 J 5,170 J
Answer:
5,170 J.
Explanation:
The amount of heat absorbed by the reaction = the amount of heat released from the calorimeter.the amount of heat released from the calorimeter (Q) can be calculated from the relation:Q = m.c.ΔT.
where, Q is the amount of heat released from the calorimeter (Q = ??? J),
m is the mass of the calorimeter (m = 1.4 kg = 1400.0 g),
c is the specific heat capacity of the calorimeter (c = 3.52 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 27.45 - 28.50 = - 1.05°C).
∵ Q = m.c.ΔT.
∴ Q = m.c.ΔT = (1400.0 g)(3.52 J/g °C)(- 1.05°C) = - 5174.0 J ≅ - 5,170 J.
∴ The amount of heat absorbed by the reaction = 5,170 J.
Answer:
When 40.0 mL of 1.00 M H2SO4 is added to 80.0 mL of 1.00 M NaOH at 20.00°C in a coffee cup calorimeter, the temperature of the aqueous solution increases to 29.20°C. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and solution is 4.184 J/g • °C, how much heat is given off in the reaction? (Ignore the mass of the calorimeter in the calculation.)
Use q equals m C subscript p Delta T..
4.62 kJ
10.0 kJ
14.7 kJ
38.5 kJExplanation:
If you have 3.00 of N2, how many moles of NH3 will be produced?
Answer:
4.50
Explanation:
3.00+1.50
A visual illustration used to show mathematical relationships is called a .
answer:
a visual illustration used to show mathematical relationships is a theory.
Answer:
Its a graph
Explanation:
average speed is ___.
a) a vector
b) the distance traveled divided by the time to travel that distance
c) measured in m/s
d) the slope of a velocity vs. time graph
I believe that the correct answer is choice B
What is the pOH of 5.92x10 -2
Answer: 1.23
Explanation: Given that there is no reaction, I will assume that the molarity corresponds to that of a base.
Therefore,
All you have to do is take the negative logarithm of that molarity
Indeed, pOH = -log(5.92x10^-2) = 1.2277 = 1.23
Note:
We could also do this for the pH.
If we were finding the pH, and that we are given the molarity (also known as [OH-]), then, we would also use the negative logarithm (-log (molarity)).
If we wanted to do the opposite, we could find the molarity with the pOH using the inverse logarithm.
10^(-1.2277) = 5.92 x 10^-2
All of the following are examples of synthesizing extept
Answer:
There are no examples provided here, but synthesis is when two substances combine to form one! This could be shown in an chemical equation.
Explanation:
Answer:
rephrasing and rewriting to create a term paper
Explanation:
4. How is photosynthesis a carbon storing process?
Carbon dioxide (CO2) in the atmosphere is necessary for plants and trees to grow. Forests play a specific and important role in the global carbon cycle by absorbingcarbon dioxide duringphotosynthesis, storing carbonabove- and belowground, and producing oxygen as a by-product of photosynthesis.
Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into energy-storing carbohydrates and oxygen. This allows plants to store carbon in the form of glucose for growth and energy reserves, effectively removing carbon dioxide from the atmosphere.
Photosynthesis is a carbon storing process because it converts carbon dioxide from the atmosphere into energy-storing carbohydrates, such as glucose, which plants can then store for later use. The general equation for photosynthesis is:
6CO₂ + 6H₂O + light energy \rightarrow C₆H₁₂O₆ + 6O₂
During this process, solar energy is harnessed through the chloroplasts in the leaves of plants, initiating a series of reactions known as the Calvin cycle. These reactions convert atmospheric carbon dioxide and water in the presence of sunlight into glucose, which plants use to grow and thrive, or store for later energy needs. For example, sweet potatoes store carbohydrates in their roots, while aloe plants store them in their leaves, making these biological reserves an important aspect for both the plants and the ecosystems they support.
14C → 14N
Describe the type of radioactive emission produced from the decay of carbon-14 to nitrogen-14 and predict its reaction to an electric field.
A) Radioactive gamma decay is produced by the reaction. This neutral electromagnetic radiation are not attracted to the electric field.
B) Beta particles are released during the radioactive decay. These negative particles are attracted to the positive plate in the electric field.
C) During the radioactive decay, alpha particles are released. These positive particles are attracted to the negative plate in the electric field.
D) Both types of radioactive emissions, particles and electromagnetic radiation, are produced during this decay. None of these are attracted to the electric field.
Answer:
B.).Beta particles are released during the radioactive decay. These negative particles are attracted to the positive plate in the electric field.
Explanation:
The radioactive decay of C-14 yields a N-14 atom via the emission of Beta particles.
The Beta particles are negatively charged and would be attracted towards the positive plate in the electric field because like charges repel but unlike charges attracts one another.
Answer:
C
Explanation:
The answer is C if you're on USA test prep.
PLEASE HELP!!!!!!!!Which of the following chemical reactions is best clasified as an acid-base reaction?
a
2HgO→2Hg + O2
b
Na2SO4 + BaCl2 →BaSO4 + 2NaCl
c
Zn + 2AgNO3 →Zn(NO3)2 + 2Ag
d
H2SO4 +2KOH →K2SO4 + 2H2O
Answer:
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Explanation:
The given reactions are:a . 2HgO → 2Hg + O₂,
It is a decomposition reaction, that HgO is decomposed to give Hg and O.
b . Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl,
It is a double replacement reaction where two salts replaces their cations and anions with each others producing 2 new salts.
c . Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag,
It is a single replacement reaction, that Zn replaces Ag from its salt.
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
It is acid-base reaction "neutralization reaction" where H₂SO₄ (acid) reacts with KOH (base) producing K₂SO₄ (salt) and water.
So, the right choice is:
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Matter changes from one state to another when ____________ is added or removed.
Answer:
Heat
Explanation: When matter is heated enough, the molecules move faster and with greater energy. If enough heat is added, a solid can become liquid and a liquid can become gas. In the same way, molecules slow down when they are cooled.
thermal energy (heat) is added or removed
Why is it so easy for magnesium atom to lose two electrons ?
Answer: Atoms want to be like a "noble gas" with a filled outer shell. I think it has to do with being in a stable state. For Mg, it's a lot easier to drop 2 electons to look like Ne rather than gain 6 to look like Argon.
therefore ,by electric configuration we get
=2,8,2As the no. of atoms is less than 5 it is easy to lose from gaining as it took some more difficulties!!!
hope its help!!✌✌✌✌✌
You and your sister both have a small camping tent set up in the backyard. You each have two strings of lights to hang inside the tent. You power your lights with a 9-volt battery and your sister uses an extension cord and powers her lights from an electrical outlet on the deck.
What is the BEST conclusion the you can make about this situation?
A
Your lights shine the brightest because your battery produces less power.
B
Your lights shine the brightest because your battery produces more power.
C
Your sister's lights shine the brightest because the electrical outlet has less power.
D
Your sister's lights shine the brightest because the electrical outlet has more power.
Answer:
D
Your sister's lights shine the brightest because the electrical outlet has more power.
Explanation:
Your sister's lights shine the brightest because the electrical outlet has more power. Thus, option D is correct.
What is power?Power is the amount of energy transferred or converted per unit of time.
The intensity of lights depends on the power that is provided by the current flowing over it, therefore the intensity would increase if we raise the current.
When current is increased in a light bulb, the light bulb shines brighter and the power increases.
Thus, option D is correct.
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Which unit of measurement should be used for the vertical axis?
A. millimeters
B. centimeters
C. kilometers
D. decimeters
Answer:
b
Explanation:
What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 8.3?
Answer:
[H⁺] = 5.012 x 10⁻⁹. & [OH⁻] = 1.995 x 10⁻⁶.
Explanation:
∵ pH = - log[H⁺]
8.3 = - log[H⁺]
∴ log[H⁺] = - 8.3.
∴ [H⁺] = 5.012 x 10⁻⁹.
∵ [H⁺][OH⁻] = 10⁻¹⁴.
∴ [OH⁻] = 10⁻¹⁴/[H⁺] = 10⁻¹⁴/(5.012 x 10⁻⁹) = 1.995 x 10⁻⁶.
Answer:
The correct answer is C.
Explanation:
I just got it correct on the test. I hope this helps!
Which is a characteristic of glacial movement?
A. The zone of wastage is at the top of the glacier.
B. Movement depends on the balance between accumulation and wastage.
C. New snowfall accumulates in a zone at the bottom of the glacier.
Answer:
(B) Movement depends on the balance between accumulation and wastage.
Explanation:
A Glacier is accumulation of snow over a particular region over many years. It is balanced by zone of accumulation and zone of wastage. The zone of accumulation is the top of the glacier where the snow or ice accumulates whereas the zone of wastage is the bottom region of the glacier which melts slowly over time. A glacier sustains if the zone of accumulation is greater than the zone of wastage.
Glacial movement is determined by the balance between accumulation and wastage.
Explanation:Glacial movement is characterized by the balance between accumulation and wastage. The movement of a glacier depends on the amount of snow and ice being added through accumulation compared to the amount being lost through wastage. New snowfall accumulates zone of accumulation at the top of the glacier, while the zone of wastage is at the bottom where ice melts and breaks off. Therefore, the correct option is B. Movement depends on the balance between accumulation and wastage.
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SUBJECT SCIENCE...... photosynthesis changes _(chemical, light, electrical) energy into _ (chemical, potential, kinetic) energy.
Answer:
light to chemical
Explanation:
a 49.2 g sample of solid iron was heated from 16.2c to 58.9c.what ws the energy change?solve for q(heat energy).iron has a specific heat value of .4494
Answer:
944.12 J
Explanation:
To solve for the energy change we use the equation Q=mc(Delta)t
Let's identify the variables we have:
m (mass) = 49.2 g
c (specific heat) = .4494
delta t (change in temp.) = final - initial = 58.9-16.2 = 42.7 degrees Celsius
Q= (49.2)(.4494)(42.7)
= 944.12 J
How do you determine the number of protons in an element
Answer:
You determine the number of protons by its atomic number, just like electrons.
I am joyous to assist you anytime.
Can anyone help me out please?
Answer:
Qustion 7:
Answer is → "c. Calcium ions and sulfate ions join together to form an insoluble compound"
Question 8:
Answer is → b. ²³⁹Pa
Question 9:
Answer is → "c. 1/3 the pressure in container B"
Explanation:
=================================================================
Qustion 7:
from the graph:
a. precipitation reactions only occur when solution temperature are decreased.
this option is wrong due to precipitation reaction can occur at room temperature or even at elevated temperature.
b. Sodium ions and chloride ions repel each other when they are in a solution.
Also, this is a wrong statement because sodium ions is positively charged and attract the negatively charged chloride ions.
d. the creation of precipitate adds mass that was previously non-existent.
From graph it is clear that the mass doesn't changed before and after the reaction remain constant (=300.23 g).
So, the right answer is
→ "c. Calcium ions and sulfate ions join together to form an insoluble compound"
=================================================================
Question 8:
According to the equation :
²³⁹U → ________+ ₋₁⁰euranium(239) loses a beta particle and so the mass numer will not change ( remains 239).So, the right answer is
→ b. ²³⁹Pa
=================================================================
Question 9:
We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have two different values of P and V:
Pₐ * Vₐ= P(b) *V(b)
from the graph:
Vₐ= 9.0 L.
V(b)= 3.0 L.
∴ Pₐ = [P(b) * V(b)] / Vₐ = [P(b) * 3.0 L] / 9.0 L = 1/3 P(b).
So, the right choice is:
Answer is → "c. 1/3 the pressure in container B"
=================================================================
How many moles do 10.0 mg of CO represent?
0.28
0.036
0.000357
0.0036
For this case we have that, according to the periodic table, the atomic mass of the Carbon is [tex]12 \frac {g} {mol}[/tex] and that of the Oxygen is[tex]16 \frac {g} {mol}.[/tex]
By definition, the number of moles is given by:
[tex]n = \frac {M} {MM}[/tex]
Where:
M: It's the mass
MM: It's the molar mass
n: It is the number of moles
10 milligrams equals to 0.01 grams
[tex]n = \frac {0.01} {12 + 16} = \frac {0.01} {28} = 0.000357[/tex]
ANswer:
Option C
Answer:
0.000357 shows how many moles 10.0 of CO represent
what are the names of the major groups that settled the islands of Oceania south
choose all answers that are correct.
A. South Americans
B. Filipinos
C. Aboriginals and Maori
D. Indonesians
Answer:
i think it's B, C and D
Explanation:
Pick the correct answer down below
The correct answer is A I believe!
the correct answer is d)
What are the 7 sources of energy?
The answer is Solar, Wind, Geothermal, Hydrogen, Tidal, Wave, Hydroelectric, Biomass Energy.
Final answer:
The seven sources of energy are food, geothermal energy, tidal energy, solar energy, biomass energy, fossil fuels, and nuclear energy.
Explanation:
Sources of Energy
Food: In living organisms, the source of energy is the food they consume.
Geothermal energy: This energy comes from the earth's core.
Tidal energy: Generated by the gravitational pull of the moon and sun.
Solar energy: Produced by the sun's light and is responsible for wind, the water cycle, and photosynthesis.
Biomass energy: Created by plants, algae, and cyanobacteria utilizing solar energy through photosynthesis. Biomass can be burned for biofuels.
Fossil fuels: Formed from ancient biomass over millions of years. Includes coal, oil, and natural gas.
Nuclear energy: Generated through nuclear reactions, such as those in the sun and nuclear power plants.
Igneous rocks formed below earths surface
A) igneous rocks
B) extrusive
C) intrusive
D) lava
Answer:
The answer is C. Instrusive
Explanation:
The ingneas rocks are those that form when the magma cools and reaches a solid state. When this type of volcanic rock cooling occurs below the surface of the earth's crust, it is known as intrusive rocks. This type of igneous rock is formed from the magma that has solidified, creating crystals.
Igneous rocks formed below earths surface C) intrusive.
Igneous rocks are classified based on their origin and formation process. They are formed from the solidification of molten material, known as magma or lava. When magma cools and solidifies beneath the Earth's surface, it forms intrusive igneous rocks.
Intrusive igneous rocks are characterized by their formation within the Earth's crust. The magma, which is molten rock, rises to the surface and gets trapped in underground chambers called magma chambers. As the magma cools slowly over time, the minerals within it crystallize and solidify to form intrusive igneous rocks.
The slow cooling process of the magma beneath the Earth's surface allows for the growth of large mineral crystals. The resulting rocks have a coarse-grained texture due to the visible crystals. Examples of intrusive igneous rocks include granite, diorite, and gabbro.
On the other hand, extrusive igneous rocks are formed from lava that erupts onto the Earth's surface and cools quickly. The rapid cooling prevents the growth of large crystals, resulting in a fine-grained or glassy texture. Examples of extrusive igneous rocks include basalt, andesite, and obsidian.
Therefore, the correct answer is C) intrusive, as it refers to igneous rocks formed below the Earth's surface through slow cooling of magma.
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Which of the following can a cell contain?
1:) A number
2:) A word
3:) A function
4:) All of these
(my first guess was #3, just to be sure)
Answer: D. All of these
A cell contains of the options listed therefore it is D
Definitely 3 because a cell can contain many functions
HELP ME PLZZZZ ASAP
Which statements describe asexual and sexual reproduction? Check all that apply.
1. Sexual reproduction always requires two parents.
2. Methods of asexual reproduction are forms of meiosis.
3. Asexual reproduction requires only one parent.
4. In sexual reproduction, offspring receives all of its DNA from one parent.
5. The offspring of sexual reproduction have the same DNA as the parent.
Answer:
1. Sexual reproduction always requires two parents.
3. Asexual reproduction requires only one parent.
Explanation:
The statement which clearly distinguish two types of reproduction is option 1. Sexual reproduction always require two parents whereas, asexual reproduction.
What is asexual reproduction ?Asexual reproduction refers to a type of reproduction where a child is born to a single parent. The newly created people are clones of their parents since they have the same genetic makeup and physical characteristics.
Both multicellular and unicellular species can reproduce asexually. There will be no gamete fusion involved in this procedure, and the number of chromosomes will remain the same.
Sexual reproduction always requires two parents. The genetic traits from both parents are inherited to the offsprings. However , not all of them can be active traits some goes hidden. Hence, option 1 is correct.
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