Answer:
8 electrons.
Explanation:
On a periodic table, one can see that Oxygen has 8 protons.
The number of protons in a neutral atom will always equal the number of electrons.
The Earth's crust surrounds its
A. Mountains
B. volcanoes
C. mantle
D.valleys
Answer:
C. Mantle
Explanation:
mantle is the inside of the Earth
Answer:
C... i think
Explanation:
Which is the property of nonmetals to evaporate easily.
Answer:
volatile
Explanation:
They are also poor conductors of electricity for they tend to form negative ions by gaining or sharing electrons [to be stable] unlike the metals. Hence, they have high ionization energy and high electronegativity values. In addition, nonmetals are usually volatile, which means that they evaporate easily
Explain why hydrogen and oxygen are transported as liquids rather than gases in a shuttle fuel tank
Answer:
Explanation:
Oxygen takes up less space as a liquid than as a gas, so engineers can fit more oxygen into the same tank.
Hope this helps
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What is observational evidence?
Answer:
evidence you see with your eyes
Explanation:
Samples with masses of 5.5 g 2.27 g and 0.8995 g are mixed together. The sum of the masses of the three
samples, expressed to the correct number of significant figures should be recorded as
Answer:
[tex]m=8.7g[/tex]
Explanation:
Hello,
In this case, it is widely known that when measurements with different significant figures are put under mathematical operations, the final result must be displayed with the same amount of significant figures of the shortest measurement, thus, due to the fact that 5.5 g has two significant figures only the result is consequently shown with two significant figures as well as shown down below:
[tex]m=5.5g+2.27g+0.8995g\\\\m=8.6695g[/tex]
By rounding the first six to seven due to the fact that the next six is greater than five, according to rounding rules, the result is:
[tex]m=8.7g[/tex]
Best regards.
Consider the following expression:8.30 x 10^-5 = x(0.100 + x)^2We can solve for x using a technique called successive approximations.8.30 x 10^-5 =x1 (0.100)^2Step 1: If we assume that x is very small compared to 0.100 (such that 0.100 x ? 0.100) then our first approximation of x (let\'s call it x1) can be calculated asx1 = ?Step 2: Now, take your first approximation of x and plug it into the full equation.8.30 x 10^-5 =x2 (0.100 + x1)^2x2 = ?Step 3: Each successive approximation uses the value from the previous approximation.8.30 x 10^-5 =x3 (0.100 +x2)^2x3 = ?Step 4, etc.: Continue this process until two x values agree within the desired level of precision.x4 = ?x5 = ?Which values are the first to agree to two significant figures?a. x1 and x2b. x2 and x3c. x3 and x4d. x4 and x5Which values are the first to agree to three significant figures?a. x1 and x2b. x2 and x3c. x3 and x4d. x4 and x5
Answer:
a. x3 and x4 are the first to agree to two significant figures
b. x4 and x5 are the first to agree to three significant figures
Explanation:
8.30 x 10⁻⁵ = x1(0.100)²
8.30 x 10⁻⁵ = 0.01x1
x1 = 8.30 x 10⁻⁵/0.01 = 0.0083
8.30 x 10⁻⁵ = x2(0.100 + 0.0083)²
8.30 x 10⁻⁵ = (0.01172889)x2
x2 = 8.30 x 10⁻⁵/0.01172889
x2 = 0.007076543475128
8.30 x 10⁻⁵= x3 (0.100 + 0.007076543475128)²
8.30 x 10⁻⁵ = 0.011465386162581)x3
x3 = 8.30 x 10⁻⁵/0.011465386162581
x3 = 0.007239180505832
8.30 x 10⁻⁵ = x4 (0.100 + 0.007239180505832)²
8.30 x 10⁻⁵ = (0.011500241835562) x4
x4 = 8.30 x 10⁻⁵/0.011500241835562
x4 = 0.007217239531723
8.30 x 10⁻⁵ = x5 (0.1 + 0.007217239531723)²
8.30 x 10⁻⁵ = (0.011495536452803) x5
x5 = 8.30 x 10⁻⁵/0.011495536452803
x5 = 0.007220193710904
From the above results;
a. x3 and x4 are the first to agree to two significant figures
b. x4 and x5 are the first to agree to three significant figures
Identify the structure of (E)-2-butenal
Answer:
See attached picture.
Explanation:
Hello,
In this case, the E-Z nomenclature for alkenes is also related with the trans-cis ones, being the Z (zusammen) same as cis and E (entgegen) same as trans, therefore, for the structure of the (E)-2-butenal which has the double bond at the second carbon is shown on the attached picture considering it is an aldehyde with the carbonyl group due to the -al- suffix.
Regards.
A person's heartbeat is 79 beats per minute. If his/her heart beats 3.1e9 times in a lifetime, how long (in whole years) does the person live?
Answer:
75 years
Explanation:
The heart of the person beats 3.1x10⁹ times. As the heartbeat is 79 beat / min. The minutes the person lives are:
3.1x10⁹ beat * (1min / 79beat) = 3.92x10⁷ min.
1 hour are 60 minutes:
3.92x10⁷ min * (1 hour / 60min) = 6.54x10⁵hours
24 hours are 1 day:
6.54x10⁵hours * (1 day / 24h) = 2.725x10⁴ days.
1 year are 365 days:
2.725x10⁴ days * (1 year / 365 days) = 74.6 years.
In whole years are 75 years
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Which of the following explains how Albert Einstein tried to influence the use of his discovery of the energy equation? (5 points)
Select one:
a. He opposed the use of nuclear fusion during the Manhattan Project.
b. He recommended uncontrolled fusion for medical testing and treatment.
c. He recommended applying the principles of nuclear fission to defend against enemies.
B
i hope this helped!
None of the above are correct.
Albert Einstein supported the use of radioactive elements for medical diagnostic purposes.
I hope this helps, good luck!
Sulfuric acid is: ___________
a) a homogeneous mixture,
b) a compound,
c) an atom,
d) a heterogeneous mixture
e) an element
Answer:
D
Explanation:
two different types of elements combine to form an acid
Identify the precautions to take with exits in the lab.
How might the mass of the same object differ when measured on a triple beam balance versus an electronic scale? EXPLAIN your answer.
Answer:
They are two different objects and they measure things differntly
Explanation:
Help ASAP please urgent
Nicole has 2 glasses on the counter: one of water and one of sugar. She is baking a cake and needs to use the sugar-water for the glaze. Both glasses look identical, but one contains a mixture and the other contains a compound.
Is sugar-water a mixture or a compound? Define mixtures and compounds, and explain how, without tasting it, Nicole can test to make sure sure she is using the sugar-water in the glaze
PLEASE HELP
Answer:It is a mixture
Explanation:
If it is pure sugar it’s neither but if it has water it is a homogeneous mixture
Mixture are produced by the physical combination of two or more components. A compound is formed by the chemical bonding of atoms. Sugar water is an example of homogeneous mixture.
What are compounds?Compounds are formed by the combination of atoms or molecules through chemical bonding. There are various kinds or compounds based on the type bonding such as ionic, covalent, metallic etc.
Mixtures are formed by the physical combination of two or more components. However, mixture can be chemically bonded particles. There are two types of mixtures. Homogeneous mixtures are formed by uniform distribution of particles.
Homogenous mixtures appear to be one compound since it have only one phase. Heterogenous mixtures are exhibiting separated phases and the particles are randomly distributed here.
Sugar water is formed by dissolving sugar on water where, the sugar is completely dissolved in water and thus is an example of homogenous mixture.
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What is a molarity a measurement
Answer:
Molarity indicates the number of moles of solute per liter of solution and is one of the most common units used to measure the concentration of a solution.
Explanation:
Answer:
concentration
Explanation:
how many molecules of O2 are required?
Answer:
Question is incomplete.
what is Boyle's law
law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature
Answer:
Boyle's law is a pressure versus volume relationship. The law was discovered by Robert Boyle in the 17th century. It states the pressure of a fixed amount of a gas is inversely proportional to its volume at a constant temperature.
Explanation:
pressure versus volume relationship
What are different types of measurements in chemistry (make sure it's relevant)?
Answer:
Meters, kilograms, kelvin, candela, mole, ampere, seconds.
Explanation:
These are the seven different types of measurements in chemistry. Hope it helps!
Practice entering numbers that include a power of 10 by entering the diameter of a hydrogen atom in its ground state, dH=1.06×10−10m d H = 1.06 × 10 − 10 m , into the answer box.
Answer:
The diameter of the hydrogen [tex]\mathbf{d =1.0605 \times 10^{-10}\ m}[/tex]
Explanation:
From the given information:
Using the concept of Bohr's Model, the equation for the angular momentum can be expressed as:
[tex]L = \dfrac{nh}{2 \pi}[/tex]
Where the generic expression for angular momentum is:
L = mvr.
replacing the value of L into the previous equation, we have:
[tex]mvr= \dfrac{nh}{2 \pi}[/tex]
[tex]v= \dfrac{nh}{2 \pi mr}[/tex] ----- (1)
The electron in the hydrogen atom posses an electrostatic force which gives a centripetal force.
[tex]\dfrac{ke^2}{r^2} = \dfrac{mv^2}{r}[/tex] ----- (2)
replacing the value of v in equation (1) into (2), and taking r as the subject of the formula, we have:
[tex]\dfrac{ke^2}{r} = m (\dfrac{nh}{2 \pi mr})^2[/tex]
[tex]ke^2=\dfrac{n^2h^2}{4 \pi^2 mr}[/tex]
[tex]r =\dfrac{n^2h^2}{4 \pi^2 mke^2}[/tex]
For ground-state n = 1
[tex]h = (6.625 \times 10^{-34} \ J.s)^2[/tex]
[tex]m =( 9.1 \times 10^{-31} \ kg)(9 \times 10^9 \ N .m^2/C^2)[/tex]
[tex]Ke = (1.6 \times 10^{-19} \ C)^2[/tex]
[tex]r =\dfrac{(1)^2(6.625 \times 10^{-34})^2}{4 \pi^2 (9.1 \times 10^{-31} )(9 \times 10^9 ) (1.6 \times 10^{-19})^2}[/tex]
[tex]r =\dfrac{4.3890625 \times 10^{-67}}{8.27720295 \times 10^{-57}}[/tex]
[tex]\mathbf{r = 5.3025 \times 10^{-11} \ m}[/tex]
Therefore, the diameter of hydrogen d = 2r
[tex]\mathbf{d = ( 2 \times 5.3025 \times 10^{-11} \ m})}[/tex]
[tex]\mathbf{d =1.0605 \times 10^{-10}\ m}}[/tex]
When 229.0 J of energy is supplied as heat to 3.00 mol of Ar(g) at constant pressure the temperature of the sample increases by 2.55 K. Assuming that in the experiment the gas behaves as an ideal gas, calculate the molar heat capacities at constant volume and at constant pressure of Ar(g).
Answer:
The molar heat capacity at constant volume is 21.62 JK⁻¹mol⁻¹
The molar heat capacity at constant pressure is 29.93 JK⁻¹mol⁻¹
Explanation:
We can calculate the molar heat capacity at constant pressure from
[tex]C_{p,m} = \frac{C_{p} }{n}[/tex]
Where [tex]C_{p,m}[/tex] is the molar heat capacity at constant pressure
[tex]{C_{p} }[/tex] is the heat capacity at constant pressure
and [tex]n[/tex] is the number of moles
Also [tex]{C_{p} }[/tex] is given by
[tex]{C_{p} } = \frac{\Delta H}{\Delta T}[/tex]
Hence,
[tex]C_{p,m} = \frac{C_{p} }{n}[/tex] becomes
[tex]C_{p,m} = \frac{\Delta H }{n \Delta T}[/tex]
From the question,
[tex]\Delta H[/tex] = 229.0 J
[tex]n[/tex] = 3.00 mol
[tex]\Delta T[/tex] = 2.55 K
Hence,
[tex]C_{p,m} = \frac{\Delta H }{n \Delta T}[/tex] becomes
[tex]C_{p,m} = \frac{229.0}{(3.00) (2.55)}[/tex]
[tex]C_{p,m} =[/tex] 29.93 JK⁻¹mol⁻¹
This is the molar heat capacity at constant pressure
For, the molar heat capacity at constant volume,
From the formula
[tex]C_{p,m} = C_{v,m} + R[/tex]
Where [tex]C_{v,m}[/tex] is the molar heat capacity at constant volume
and [tex]R[/tex] is the gas constant ([tex]R[/tex] = 8.314 JK⁻¹mol⁻¹)
Then,
[tex]C_{v,m} = C_{p,m} - R[/tex]
[tex]C_{v,m} = 29.93 - 8.314[/tex]
[tex]C_{v,m} =[/tex] 21.62 JK⁻¹mol⁻¹
This is the molar heat capacity at constant volume
An organism is heterotrophic, multicellular/unicellular, eukaryotic, and
reproduces asexually/sexually, it's Kingdom is..."
Plantae
Protista
Animalia
Fungi
Answer:
your answer is protista
Answer:
Plantae
Explanation:
I think the answer is plantae, beacuse plants are heterotrophs.
Food contains chemical potential energy that the body uses. How do you think that the body gains this energy? Propose an explanation.
Answer:
The body gain the energy through the digestion of the food we eat and when it is breakdown it releases energy.
Explanation:
The food we consumed is digested by the activities of acids and enzymes in the stomach.
Carbohydrates are the primary source of body energy.
When it is eaten, it digestion starts from the mouth when it mixed with the saliva released from the salivary gland and salivary amylase acts on it.
When it's get to the stomach/ intestine, it is further breakdown through the activities of enzymes into glucose.
The stomach and the intestine absorb the glucose and release it into the blood stream. Glucose can be use as energy source or stored later and insulin help to release it.
Answer:
Explanation:
When the food substances (for example carbohydrate) that contain chemical potential energy are broken down, they produce glucose. Carbohydrate is the major source of glucose for the body, the digestion of carbohydrate begins in the mouth in the presence of the enzyme called amylase.
When glucose is produced from carbohydrate breakdown, the glucose is picked up by insulin which allows the glucose enters the cells. In the cells, these glucose molecules undergo glycolysis (glucose breakdown/catabolism) in order to produce ATP (high energy molecules that provides energy for all cell). When ATP is produced, the cells use the ATP to carry out several body and biological functions. These multi-enzyme steps explains how the body gains this energy.
What two physical properties are used to describe matter?
Answer:
(masa, volumen y temperatura), las cuales miden valores que no sirven en sí para identificar una materia de otra, y otras denominadas Propiedades Características.
Explanation:
The brain is a part of what organ system?
Answer:
the nervous system
Explanation:
Answer:
central nervous system
Explanation:The brain and the spinal cord are the central nervous system. The nerves that go through the whole body make up the peripheral nervous system.
How many atoms of Oxygen are in 5H2PO3? A. 15 B. 8 C. 12
Please help!!
Answer:
15 atoms
Explanation:
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How do molecules of varying sizes separate in electrophores?
Answer:
Smaller molecules migrate through the gel more quickly and therefore travel further than larger fragments that migrate more slowly and therefore will travel a shorter distance. As a result the molecules are separated by size.
Explanation:
How do I Determine the concentration of each of the individual ions in a 0.800 M (NH4)2S solution
Answer:
Explanation:
There are 2 NH4 in the equation therefore just multiply the molarity of the total solution by 2. Aaaaaaaaaaaaaaaaaaaaaaaaaaaand listen to "She Blinded Me With Science" by Thomas Dolby! ;)
You need to prepare an acetate buffer of pH 5.24 from a 0.796 M acetic acid solution and a 2.65 M KOH solution. If you have 830 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.24 ? The pKa of acetic acid is 4.76. Be sure to use appropriate significant figures
Answer:
187.3mL of 2.65M KOH you must add
Explanation:
The pH of the buffer of acetic acid is obtained as follows:
pH = pKa + log [Acetate] / [Acetic Acid]
Where [] could be moles of acetate and acetic acid
Replacing:
5.24 = 4.76 + log [Acetate] / [Acetic Acid]
0.48 = log [Acetate] / [Acetic Acid]
3.01995 = [Acetate] / [Acetic Acid](1)
As concentration of acetic acid is 0.796M and volume is 830mL, the moles of acetic buffer is:
0.830L * (0.796 moles / L) = 0.6607 moles
Thus:
0.6607 moles = [Acetate] + [Acetic Acid] (2)
Replacing (2) in (1):
3.01995 = 0.6607 moles - [Acetic Acid] / [Acetic Acid]
3.01995 [Acetic Acid] = 0.6607 moles - [Acetic Acid]
4.01995 [Acetic Acid] = 0.6607 moles
[Acetic Acid] = 0.16435 moles
[Acetate] = 0.6607 moles - 0.16435 moles = 0.49635 moles
The reaction of acetic acid with KOH to produce Acetate is:
Acetic acid + KOH → Acetate + Water
That means the moles of KOH you add, are the moles of acetate.
To add 0.49635 moles of 2.65M of KOH you need:
0.49635 moles * (1L / 2.65 moles) = 0.1873L =
187.3mL of 2.65M KOH you must addQuestion 2
Status: Not yet answered Points possible: 1.00
A graduated cylinder contains 10.00 mL water. A 14.74g piece of aluminum is added to the water, and the volume rises to 15.46
mL. What is the density of the aluminum in g/mL?
Type answer
Answer:
[tex]\rho = 2.7g/mL[/tex]
Explanation:
Hello,
In this case, given that the density for a material es defined via its mass and volume:
[tex]\rho =\frac{m}{V}[/tex]
We first need to compute the volume of aluminum in this case, since it comes from the volume of cylinder and the volume of the cylinder with the aluminum:
[tex]V=15.46 mL-10.00mL\\\\V=5.46mL[/tex]
In such a way, the density turns out:
[tex]\rho=\frac{14.74g}{5.46mL}\\ \\\rho = 2.7g/mL[/tex]
Best regards.
The last group on the periodic table is called the noble gases. The elements in this group are
all gases and are unreactive. Which property causes the noble gases to be unreactive?
A. atomic radius
B. atomic weight
C. full valence electron configuration
D. structure of the nucleus
Answer:
C
Explanation:
They are stabil and full of valence electron.
Considering the definition and properties of noble gases, a full valence electron configuration causes the noble gases to be unreactive. (option C)
Noble gasesNoble gases or inert gases are known as the set of chemical elements that constitute group 18 (VIIIA) of the Periodic Table of the elements.
Reactivity of noble gasesNoble gases have a very low chemical reactivity. This is because they have a complete valence shell that gives them a low tendency to capture or release electrons. For this reason they have also received the name of inert gases or rare gases.
In other words, the electronic configuration of the noble gases is that their outermost shell or valence shell is always complete, without the need to accept or give up electrons. Then they are in a state of maximum stability.
Because all chemical transformations involve valence electrons, noble gases do not participate in chemical reactions to form chemical compounds, since they are very stable on their own.
SummaryIn summary, a full valence electron configuration causes the noble gases to be unreactive. (option C)
Learn more about noble gases:
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