Answer:
Explanation:
The isotope Al-27 has 13 protons and 14 neutrons. Aluminium's average atomic mass is 26.981539 AMU
the chemical bonds that form when atoms that have lost electrons are electrically attracted to atoms that have gained electrons are called
. a large piece of jewelry has a mass of 132.6 g. a graduated cylinder initially contains 48.6 ml water. when the jewelry is submerged in the graduated cylinder, the total volume increases to 61.2 ml.
The large piece of jewelry that has a mass of 132.6 g and when is submerged in a graduated cylinder that initially contains 48.6 ml water and the volume increases to 61.2 ml once the piece of jewelry is submerged, has a density of: 10.523 g/ml
To solve this problem the formulas and the procedures that we have to use are:
v = v(f)-v(i)d = m/vWhere:
d= densitym= massv= volumev(f) = final volumev(i) = initial volumeInformation about the problem:
m = 132.6 gv(i) = 48.6 mlv(f) = 61.2 mlv = ?d =?Applying the volume formula we get:
v = v(f)-v(i)
v = 61.2 ml - 48.6 ml
v = 12.6 ml
Applying the density formula we get:
d = m/v
d = 132.6 g/12.6 ml
d = 10.523 g/ml
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Using the information in the table to the right, calculate the average atomic mass of strontium. Report to two decimal places. amu A 3 column table with 4 rows titled Strontium. Column 1 is labeled Isotope with entries Upper S r-84, Upper S r-86, Upper S r-87, Upper S r-88. Column 2 is labeled Mass (a m u) with entries 83.913428, 85.909273, 86.908902, 87.905625. Column 3 is labeled Abundance (percent) with entries 0.56, 9.86, 7, 82.58.
The average atomic mass of strontium reported to two decimal places is 87.62 amu
The average atomic mass of an element may be determined by adding the atomic mass units of all its isotopes and dividing the result by the abundance percent/100.The average atomic mass of strontium (Sr) = [(atomic mass of Sr-84)(Abundance / 100) + (atomic mass of Sr-86)(Abundance / 100) + (atomic mass of Sr-87)(Abundance / 100) + (atomic mass of Sr-88)(Abundance / 100)].The average atomic mass of strontium[tex](Sr) = [(83.913428)(0.0056) + (85.909273)(0.0986) + (86.908902)(0.07) + (87.905625)(0.8258)][/tex]= 87.6166 amu ≅ 87.62 amu.The weighted average mass of the atoms in a naturally. The average atomic mass, commonly referred to as atomic weight, is a naturally occurring sample of an element. The standard units for expressing average masses are unified atomic mass units (u), where 1 u equals precisely one-twelfth the mass of a neutral atom of carbon-12.To learn more about average atomic mass visit:
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Based on the amino acid sequences of each histone, estimate the charge of a histone octamer at ph 7. Assume that histidine residues are uncharged at this ph.
The histone octamer has a total charge of +146 at pH 7 if histidine residues are assumed to be uncharged.
There are 9 negatively charged (Asp + Glu) and 26 positively charged (Arg + Lys) residues in total on histone H2B.
The net charge on H2A is 26 - 9 = +17.
There are 10 negatively charged (Asp + Glu) and 28 positively charged (Arg + Lys) residues in total on histone H2B.
The net charge on H2B is 28 - 10 = +18.
There are 11 negatively charged (Asp + Glu) and 31 positively charged (Arg + Lys) residues in total on histone H3.
The net charge on H3 is 31 - 11 = +20.
There are 7 negatively charged (Asp + Glu) and 25 positively charged (Arg + Lys) residues in total on histone H4.
The net charge on H4 is 25 - 7 = +18.
2 x (17 + 18 + 20 + 18) = +146 is the total charge of the histone octamer.
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a volume of saline solution had a mass of 25.6 g at 4 °c. an equal volume of water at the same temperature had a mass of 24.5 g. what is the density of the saline solution? quizlet
The saline solution has a density of 1.045 g/mL.
StepsPure water has a density of 1.000 g/mL.
The saline solution has larger mass, but the volumes are equal.
d = 1.000 g/ml ×25.6g / 24.5g
d = 1.045 g/mL.
The saline solution has a density of 1.045 g/mL.
What is the purpose of saline solution?They support patients through surgery, dialysis, and chemotherapy, cure dehydration, flush wounds, and provide diluted medication. 9 grams of salt per litre of water is what makes up saline solution, or a 0.9% solution of sodium chloride.Is saline solution just water and salt?Salt and water are combined to make saline. Because of its salt content (0.9% saline), which is comparable to that of tears, blood, and other bodily fluids, a normal saline solution is known as normal. Isotonic solution is another name for it.Why don't you use water instead of saline solution?Because it is a nontoxic, isotonic solution that does not impair healing, normal sterile saline is recognised as the most suitable and preferred cleansing solution.
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A student is performing an experiment that requires measuring the boiling point of water. The accepted value for the boiling point of pure water is 100.0ºC. In the experiment, the student measured the boiling point to be 99.2ºC. What is the percent error in the student’s experiment?
percentage error in the student’s experiment is 0.8%
To find percentage error we use the formula I E -T I / I T I X100
so by the given data experimental value is 99.2ºC and actual theoretical value is 100.0ºC by putting the values we get 0.8% error.
To determine how closely the measured number resembles the real value, the percentage error is calculated. It is a component of a thorough error analysis. In most domains, % error is always reported as a positive figure, although in some, either a positive or negative value is acceptable.
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Answer: B
Explanation: :)
(a) how many different isotopes of the element were in the sample? (b) describe how to use the information from the mass spectrum to determine the average atomic mass of the element.
The ground state electron configuration of the element is; 1s2 2s2 2p6 3s2.
What is the mass spectrum?The mass spectrum shows the identity of an element. We can use it to identify the number of isotopes in the elements as well as the abundance of each of the isotopes.
Now, the element that is here has three isotopes, the element is magnesium. We can obtain the relative atomic mass as the sum of the products of the mass of each isotope and its relative abundance. The ground state electron configuration of the element is; 1s2 2s2 2p6 3s2.
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Explain why the bears would need to "pack on enough pounds" before they hibernate
If the bears don't pack on enough pounds before they hibernate, they won't enough energy that will sustain them during the hibernation period.
What is hibernation?
Hibernation is a condition when an animal slows its heart rate to save energy and survive the winter without eating much.
Some animals just slow down and move less frequently during hibernation, but others go into a deep sleep and don't wake up till spring.
What would happen to bears if they don't pack on enough pounds?If the bears don't pack on enough pounds before they hibernate, they won't return to the mountains to den for the winter.
Packing on enough pounds will provide them with enough energy that will sustain them during the hibernation period.
Thus, If the bears don't pack on enough pounds before they hibernate, they won't enough energy that will sustain them during the hibernation period.
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Calculate the mass of 2.5 × 1023 formula units of calcium phosphate Ca,(PO4)2
Answer:
310 u
Explanation:
Hence, the formula unit mass for Ca 3 ( PO 4 ) 2 is 310 u .
For a snack, I ate 40 gummy bears. Each gummy bear weighs 3g.
If gummy bears are 100% carbohydrates and carbohydrates are 4 kcal/g, how many kcal I eat?
Taking into account the rule of three, you eat 480 kcal.
Rule of threeThe rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, the direct rule of three must be applied as follow, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b)÷ a
kcal of eaten gummy bearsTo know the mass of eaten gummy bears, the following rule of three applies: if 1 gummy bear weighs 3 g, 40 gummy bears weigh how much mass?
1 gummy bear ⇒ 3 g
40 gummy bears ⇒ x
So: x= (40 gummy bears× 3 g)÷ 1 gummy bear
Solving:
x= 120 g
If gummy bears are 100% carbohydrates and carbohydrates are 4 kcal/g, the following rule of three applies: If 1 g has 4 kcal, 120 g has how many kcal?
1 g ⇒ 4 kcal
120 g⇒ x
So: x= (120 g× 4 kcal)÷ 1 g
Solving:
x= 480 kcal
In summary, you eat 480 kcal.
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The smallest unit of an element that has the chemical properties of the element is the.
Answer: An atom
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What is the independent variable?
what is the dependent variable?
what are the constants?
what equipment and materials will you use? (please include amounts and use SI units if possible)
what data and observations will you record?
what safety precautions will you take?
what is the general procedure you will follow for your experiment? (this can be in a paragraph or numbered list form)
Answer:
independent variable is what you change in a science experiment, dependent variable is what's being measured in a science experiment. any characteristics, number, or quantity that can be measured or counted. A variable may also be called a data item.
A constant is a quantity that does not change. Although you can measure a constant, you either cannot alter it during an experiment or else you choose not to change it. Contrast this with an experimental variable, which is the part of an experiment that is affected by the experiment.
for materials and equipment, can be a ruler, and a data chart to put information, and a timer if needed,
you will record the amount of baking powder you have, and make observations of making sure you have the right amount of baking powder.
also make sure your experiment is safe.
I guess you can use a data chart to keep track of your information, and you can make a hypothesis, conlusion, BUT NO OPINION, make sure to know that before starting a experiment
What is the energy if the frequency is 8.33 x 10^-4 Hz
a voltaic cell is based on the reduction of ag (aq) to ag(s) and the oxidation of sn(s) to sn2 (aq).
Half-reaction for the cell's anode is given below:
Anode : [tex]\\Sn(s) \rightarrow Sn^{2+} (aq) +2e^{-}[/tex]
The anode is defined as the electrode at which electrons leave the cell and oxidation occurs, and the cathode as the electrode at which electrons enter the cell and reduction occurs. The anode is usually the positive side.
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Your given question is quite incomplete here is complete question.
A voltaic cell is based on the reduction of _ Agt(aq) to Ag(s) and the oxidation of Sn(s) to Sn2+(aql) : Part 1 Include the phases of all species in the chemical equation: (aqh Anode: Sn(s) Sn?+ (aq)
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Use the periodic table above to determine which of the following elements has 4 valence electrons as a neutral atom. (1 pt)
*
1 point
Magnesium (Mg, #12)
Lithium (Li, #3)
Silicon (Si, #14)
Sulfur (S, #16)
3. What would the following two activities lead to: *
a. Planting more trees
b. Prohibiting fishing during breeding season
O Decreased Biodiversity
Biodiversity will remain unaffected
O Biodiversity will increase
5 MINS TILL DUE
The following activities of planting more trees and prohibiting fishing during the breeding season will lead to maintain biodiversity, which means the biodiversity will remain unaffected.
Biodiversity describes the huge variety of life on Earth. It can be used to refer to all of the species in one region or ecosystem. Biodiversity refers to every living thing, including plants, bacteria, animals, and humans. It is the variation among the living organisms.
A large number of plant species results in greater variety of crops. It results in the natural sustainability for all the life forms. Reforestation or planting more trees helps in the increase of the primary production, reduce the susceptibility and results in the increase of ecological resistance, like climate changes, etc.
Aquaculture can greatly impact the biodiversity. It is important to manage it to maintain it. Prohibiting fish farming or fishing during breeding season will help maintain the biodiversity there is no decline in fish species. Overfishing also affects the genetic diversity.
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hydrochloric acid + chromium hydrogencarbonate =
how do I complete this word equation and then convert it to a BALANCED word equation
Answer:
3HCl + Cr (HCO3)3 --> CrCl3 + 3CO2 + 3H2O
brainly which change is chemical?(1 point) water freezing: liquid water becoming solid water water freezing: liquid water becoming solid water water boiling: solid water becoming gaseous water water boiling: solid water becoming gaseous water water evaporating: liquid water becoming gaseous water water evaporating: liquid water becoming gaseous water water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules
An example of a chemical change is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules.
In chemistry, changes are classified into two: physical and chemical.
A physical change occurs when a substance or object changes its appearance, phase, or is used in a mixture. More importantly, a physical change does not change the molecular structure of a substance. These three are examples of physical changes in water, wherein the changes are on their phases only:
water freezing: liquid water becoming solid water
water boiling: solid water becoming gaseous water
water evaporating: liquid water becoming gaseous water
On the other hand, a chemical change takes place when the original substance's of molecules are taken apart and put back together into new combinations that are different from the original combinations. An example of this is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules, wherein a compound of water molecule is being break down into different molecules.
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which would least strongly attract electrons from other atoms in a compound? elements of group 1 elements of group 2
Elements from group 1 have the least chances to attract electrons due to their low electronegativity.
The atom's tendency to attract electrons in a molecule is known as electronegativity. The trend of electronegativity on the periodic table is as follows:
electronegativity increases across a period and decreases down a group.This means that the least electronegative element is from group 1 elements, specifically Cesium and Francium which have electronegativity of 0.79 and 0.70, respectively. In general, group 2 elements have higher electronegativity compared to group 1 elements. The three elements with the highest electronegativity are nitrogen, oxygen, and fluorine which have 3.04, 3.44, and 3.98, respectively.
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What is the purpose of having the Periodic Table?
Answer:
Explanation:
Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.
Answer:
Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.
Explanation:
Calculate the heat change in kilojoules for vaporization of 6.00 kg of water at 100 ∘C .
The heat change for vaporization of 6.00 kg of water at 100°C is 13490.584 kJ.
The heat or enthalpy for vaporization is the amount of heat energy which is required to bring change in the state of a substance, such as from a liquid into a vapor or gas. It is also known as enthalpy of vaporization. The unit of enthalpy for vaporization is given in joules (J) or calories (cal).
Given data :
mass of water = 6.00 kg
Hvap = 40.7 kJ/mol
To calculate the amount of heat -
we know,
the heat required for 1 mol of water to vaporize at 100°C is 40.7 kg
and
we know molar weight of water is 18.015 gram
So,
moles of 6.00 kg water is = 2600
18.1015
mole of water = 331.464 mol
Hence,
Heat change for vaporization is = 331.464 × 40.7
= 13490.584 kJ
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What causes tectonic plates to move?
What is a convergent boundary?
What is a divergent boundary?
What is a transform boundary?
What is a transform boundary?
Carlos likes to bowl. He timed how long it took for his ball to travel the length of an 18-m lane in the bowling alley. He plotted the final distance and time on a line graph. Carlos drew a line from this point to the origin of the graph.
Carlos likes to bowl. He timed how long it took his ball to travel the length of the bowling alley's 18-meter lane. The ball will travel 12 m far after it had travelled for 2 s.
What is length?Length can be defined as a term used for identifying the size of an object and distance travelled by the object from one point to another point.
The S.I. unit of length is meter.
It can also be defined as the amount of time that something can last.
Thus, Carlos likes to bowl. He timed how long it took for his ball to travel the length of an 18-m lane in the bowling alley. The ball will travel 12 m far after it had travelled for 2 s.
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Your question is incomplete but most probably your full question was
Carlos likes to bowl. He timed how long it took for his ball to travel the length of a an 18-m lane in the bowling alley. He plotted the final distance and time on a line graph. Carlos drew a line from this point to the origin of the graph.
How far down the lane was the ball after it had traveled for 2 s?
6 m
9 m
12 m
18 m
can someone help please. you will get 15 points
We could use a large size sieve to separate large stones from pear sized gravel. Option A
What is a sieve?A sieve is a device that could be used for separation. When we are carrying out separation using a sieve, the separation is done according to the sizes of the materials. We know that the sieve allows a given size of the material to pass through while holding back the other sizes.
In this case, we can see a sieve that has been pictured in the question. The size of the sieve is what determines the kind of things that it could separate. As such, we could use a large size sieve to separate large stones from pear sized gravel. Option A
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be sure to answer all parts. draw bond-line structural formulas (not lewis structures) for all the constitutional isomers that have the given molecular formula. c3h7cl window open cl at c-1 draw structure ... cl at c-2
The compound C3H7Cl chloropropane has two constitutional isomers: 1-chloropropane and 2- chloropropane as shown in the picture.
Isomerism is the phenomenon in which distinct compounds with the same chemical formula exist side by side.Isomerism can be divided into two main subcategories, each of which has a different definition. Stereoisomerism and structural isomerism are the two main forms.In C3H7Cl we can only observe only 2 isomers. formula will be the same but the positioning of chlorine will change. More than 2 isomers cannot be obtained because propane only has 3 carbon atom. naming will start from the position of carbon atom on which chlorine is attached, therefore 3-chloropropane does not exist.so we can observe only two isomers of C3H7Cl by position chlorine on C-1 and C-2 atom.
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anything that can change in an experiment is called
Answer:
variables because they can change or be changed
give 2 examples of group 1 element
What does it mean to use an empirical approach when attempting to answer a question?
Using an empirical approach when attempting to answer mean your answer should be based on data that is backed by experiments and evidence.
It is an experiment-based approach based on real-world data and results. The empirical approach-based answer should not be made up of theories and concepts. Your calculations and results should be based on experiences in the real world. Empirical research can be Quantitative research (information based on numerical data) or Qualitative (non-numerical).
On the other hand, non-empirical or theoretical answers are based on theories and concepts that have not been experimented as of now.
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Which of the following is not a unit of volume?
Answer:
Cm2 Is not a unit of volume.
Explanation:
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electrical double layer design for proton-coupled electron transfer electrode processes: recent advances in well-defined electrode−electrolyte interface
The article aims to highlight the most recent improvements in the PCET procedures for electrocatalysis at clearly characterized electrode–electrolyte interfaces.
Aim : Here, we focus on the most recent developments in the PCET methods for electrocatalysis at clearly defined electrode–electrolyte interfaces.
Method: Since the groundbreaking and ongoing studies made by Frumkin and his colleagues initiated in the 1930s, non-covalent interaction, which is controlled by the cation/anion features, is known to play a crucial role in the interfacial water and adsorbate environments correlated to electrode–electrolyte catalytic properties.
The microscopic perspective of this interaction is still a significant scientific mystery, nevertheless. Recent research based on the well-defined surface and solid-liquid interfacial structure of single-crystal model electrodes revealed novel characteristics of the cation effect.
Practical usage: Designing high-performance electrode and electrolyte materials requires an understanding of the roles played by the electrical double layer (EDL) structure in proton-coupled electron transfer (PCET) electrode processes.
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