Answer:
B. Protons and Electrons
Explanation:
Protons have a positive charge and electrons have a negative charge. When an element contains the same number of both of those particles the charges will cancel out leaving the atom with a neutral charge, as neutrons already have a neutral charge.
If bovine haemoglobin has an extinction coefficient of 30910 L mol-1 cm-1 at 570 nm in PBS, what is the concentration of a solution reading an absorbance of 0.7?
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Explanation:
The concentration of Bovine Hb with absorbance 0.7 at 570 nm has been 2.264 [tex]\mu[/tex]M.
According to Beer's law, the absorbance of the sample can be given by:
Absorbance = Extinction coefficient [tex]\rm \times[/tex] concentration [tex]\times[/tex] path length
The Bovine Hb has the extinction coefficient = 30910 L/mol/cm
The absorbance = 0.7
The path length has been 1 cm.
The concentration of the Bovine Hb can be given as:
0.7 = 30910 [tex]\times[/tex] concentration [tex]\times[/tex] 1
The concentration of Bovine Hb = 2.264 [tex]\rm \times\;10^-^6[/tex] moles/L
The concentration of Bovine Hb = 2.264 [tex]\rm \mu[/tex]moles/L
The concentration of Bovine Hb = 2.264 [tex]\mu[/tex]M.
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How much heat is required to take a 150 g sample of water from 10.0 ℃ to 95.0 ℃? cs,water = 4.184 J/g*℃
Answer:
[tex]\boxed {\boxed {\sf 53, 346 \ Joules}}[/tex]
Explanation:
We are given the specific heat and change in temperature, so we should use this heat formula:
[tex]q=m C \Delta T[/tex]
where m is the mass, C is the specific heat capacity, and ΔT is the change in temperature.
We know the mass is 150 grams. The specific heat of water is 4.184 J/g °C.
Let's find the change in temperature.
Subtract the initial temperature from the final temperature.
ΔT= final temp - initial tempfinal= 95.0 °C and initial= 10.0 °CΔT= 95.0 °C - 10.0 °C= 85.0 °CNow we know all the values:
[tex]m= 150 \ g \\C= 4.184 J/ g \ \textdegree C \\\Delta T= 85.0 \textdegree C[/tex]
Substitute them into the formula.
[tex]q=(150 \ g) (4.184 \ J/g \ \textdegree C)(85.0 \textdegree C )[/tex]
Multiply all three numbers together. Note that the grams (g) and degrees Celsius (°C) will cancel out. Joules (J) will be the only remaining unit.
[tex]q=(627.6 \ J/ \textdegree C) ( 85.0 \textdegree C)[/tex]
[tex]q=53346 \ J[/tex]
53,346 Joules of heat are required.
How do electrons in the same orbital move?
10) What is the volume ratio of hydrogen to oxygen in water production?
Answer:
2:1
Explanation:
Water molecules feature the combinations of hydrogen and oxygen atoms in a 2:1 ratio.
An ionic bond results due to the __________________________ attraction between two oppositely charged ion.
Answer:
Electrostatic
Explanation:
An ionic bond results from the electrostatic attraction between oppositely charged ion.
Usually, metallic ion is positively charge and the non-metallic ion is negatively charged.
The attraction results in the formation of an ionic bond. Ionic bond forms by the transfer of electrons from a metal to a non - metal. The charge separation causes the oppositely charged atoms to be attracted to one another.PLEASE HELP ME OUT!!!!!
Answer:
89.1942....
Explanation:
abundance x mass on each one, the added all together:
77.742+6.201+5.251
Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion, HSO4-.
Explanation:
conjugate acid/base pairs are compounds which differ by the hydrogen ion (H⁺)
The conjugate based is formed when an acid donates a proton.
HSO₄⁻ --> H⁺ + SO₄²⁻
The conjugate base of HSO₄⁻ is SO₄²⁻
The conjugate acid is formed when a base accepts a proton.
HSO₄⁻ + H⁺ --> H₂SO₄
The conjugate acid of HSO₄⁻ is H₂SO₄
Which statement describes how the binary ionic compound KBr is named?
Which statement describes how the binary ionic compound KBr is named? The metal is named first, and the name is unchanged. Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?
B. The metal is named first and the name is unchanged.
Five liters of air at -36 c is warmed to 89c. what is the new volume if the pressure remains constant?
Answer:
Explanation:
The altitude is irrelevant, except as needed to define the pressure. In this example all three parameters of the Ideal Gas Laws are changing. We set up the equation to solve for the desired final volume. Start with the Ideal Gas Law:
P
⋅
V
=
(
n
⋅
R
⋅
T
)
where the number of moles of gas and the gas constant do not change.
(
P
V
T
)
1
=
(
P
V
T
)
2
Rearrange for the desired
V
2
, Temperatures must be in ‘K: 298 & 283.
(
P
1
V
1
T
1
)
×
T
2
P
2
=
V
2
V
2
=
P
1
×
V
1
×
T
2
T
1
×
P
2
V
2
=
730
×
855
×
283
298
×
605
=
980
L
“Change” in volume is
980
–
855
=
125
L
The table below shows the number of sub-atomic particles in an atom of boron.
What is the amu of a boron atom?
a. 5
b. 6
c. 10
d. 11
op. c 10 is ur ans
HOPE THIS HELPS!!
Answer:
11 amu=Protons+Nuetrons the actual amu in the period table is 10.8
Explanation:
amu is Protons + nuetrons (5+6) = 11
This can be crossed checked with a periodic table where it has a amu of 10.8 which can be rounded up to 11.
How many total molecules will be present when the reaction of 5,000 molecules of CS2 with 15,000 molecules of 0 2 goes to completion?
CS2(1)+3 02(g) CO2(g) + 2S02(g)
(A) 5,000
(B) 10,000
(C) 15,000
(D) 20,000
Answer:
(C) 15,000
Explanation:
The equation is ...
CS₂ +3O₂ ⇒ CO₂ +2SO₂
This indicates 1 molecule of CS₂ combines with 3 molecules of O₂ to produce 1 molecule of CO₂ and 2 molecules of SO₂.
Counting molecules, we see that the original 4 molecules in a 1:3 ratio become 1+2 = 3 molecules. The reactants present are in the necessary 1:3 ratio of CS₂ : O₂, so there are no limitations on the reaction. It can use all of the original molecules to produce ...
(3/4)(20,000) = 15,000
molecules of product.
When the reaction completes, there will be 15,000 molecules present.
PLS HELP PLS HELP PLS
Answer: liver and pancreas
Explanation:the pancreas makes insulin and the liver makes liquid to break down the food
Answer:
3) pancreas and liver.........
is yeast living or non living?
Answer:
Yeast is living.
Explanation:
Yeast is a type of fungus used in making bread. Fungus is a group of living organisms.
3. Will a paper airplane with longer wings fly farther than shorter wings?
Independent variable
Yes, the more air that can get under the wings the longer the airplane will stay airborne increasing the chances it will fly farther.
What is an independent variable ?It is an independent variable that doesn't alter as a result of the other variables you're attempting to assess. An independent variable could be something like a person's age. Other aspects of a person's life, like as what they eat, how much they attend school, or how much television they watch, won't alter their age.
Design of the paper aircraft would be your independent variable, and flight distance would be your dependent variable. Your constants would be things like where you are when you fly the planes, who is flying them, how they launch, the kind of paper used to build them, etc.The plane was tested to see how far it would fly as each paper clip was added. The manipulated variable was the mass of the plane (the quantity of paper clips added). The flying distance was the responding variable. The experiment's controlled variable was the usage of the same plane in each trial.Learn more about Independent variable here:
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In a climatological sense, dryness is a function of both annual rainfall and ________.
This a geology question.
Answer:
In a climatological sense, dryness is a function of both annual rainfall and evaporation
What do osmosis, diffusion, filtration, and the movement of ions away from like charge all have in common?
Moving material along certain gradients is necessary for osmosis, diffusion, filtration, and the transport of ions away from similar charges.
Osmosis is the flow of solvent molecules over a semi-permeable membrane from an area of lower concentration to a region of higher concentration Molecules diffuse when they travel from one area of higher concentration to another area of lower concentration The process of filtering involves moving liquid substances through a separating material known as a filter in order to separate solid particles from liquid. Due to the difference in pressures between the solid and liquid substances, this process is made feasible. Because of the difference in electrical potentials between the charges, ions move away from like charges.
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What isotope has 12 protons, 13 neutrons and 12 electrons?
Answer: Magnesium
Magnesium, in its elemental form, has 12 protons and 12 electrons. The neutrons are a different matter. Magesium's average atomic mass is 24.305 atomic mass units, but no magnesium atom has exactly this mass.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!! :D
Help! What is the the correct number for the product of this particular reaction?
Answer: synthesis, decomposition, single-displacement, double-displacement, combustion and acid-base reactions.
Explanation:
The mass of 3.02 x 10^22 molecules of water is ___.
Answer:
0.9 g (approximately)
Explanation:
A car travels 30 miles on one gallon of gasoline. Gasoline costs $4.00 per gallon. Calculate the cost of driving the car 300 miles.
Answer:
40$$$
Explanation:
Reason: 300 miles × 1gallon30miles × $4.001gallon = $40
what element have 3 PELS?
Answer:
boron aluminum gallium indium
Explanation:
hope this helps you
If a truck's tires are filled to a pressure of 2.38 atm when they are 25.0
degrees Celsius, what would their pressure be, if the temperature of the
tire goes up to 52.78 degrees Celsius after driving on the highway.
Answer:
P₂ = 2.60 atm
Explanation:
Given data:
Initial pressure = 2.38 atm
Initial temperature = 25.0 °C
Final pressure = ?
Final temperature = 52.78°C
Solution:
Initial temperature = 25.0 °C (25.0+273 = 298 K)
Final temperature = 52.78°C (52.78+273 = 325.78 K)
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
2.38 atm / 298 K = P₂/325.78 K
P₂ = 2.38 atm × 325.78 K / 298 K
P₂ = 775.35 atm. K /293 K
P₂ = 2.60 atm
Under conditions of constant temperature and amount of substance, a plot of pressure VS. volume for an ideal gas will result in:__________.
a) a line
b) a parabola
c) a logarithmic function
d) none of the above
Answer:
d) none of the above
Explanation:
The law that describes the relationship between pressure and volume of an ideal gas (under constant temperature and amount of substance) is Boyle's law.
It states that pressure is inversely proportional to the volume. This would mean that a graph of P vs 1/V would be a line.
See the attached picture for a graph of P vs V.
A plot of pressure VS. volume for an ideal gas will result in d) none of the above
The following things should be considered:
Boyle's law means the law that shows the relationship that lies between the pressure and volume of ideas gas that involved the same temperature and the substance amount.Also, the pressure should be inversly proportional with respect to the volume.Therefore we can conclude that a plot of pressure VS. volume for an ideal gas will result in d) none of the above
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A. Iodine
B. Gold
C. Magnesium
D. Potassium
Answer:
A, Iodine
Explanation:
It exists, sodiumiodine.
4.45 kcal of heat was added to increase the temperature of a sample of water from 23.0 °C to 57.8 °C. Calculate
the grams of water. Specific heat of water is 1 cal/g. °C. lkcal = 1000cal
Answer:
m = 4450 g
Explanation:
Given data:
Amount of heat added = 4.45 Kcal ( 4.45 kcal ×1000 cal/ 1kcal = 4450 cal)
Initial temperature = 23.0°C
Final temperature = 57.8°C
Specific heat capacity of water = 1 cal/g.°C
Mass of water in gram = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 57.8°C - 23.0°C
ΔT = 34.8°C
4450 cal = m × 1 cal/g.°C × 34.8°C
m = 4450 cal / 1 cal/g
m = 4450 g
- In each of the following sets of elements, which
element shows the least ability to gain or lose
electrons?
a. Cs, Rb, Na
b. Ba, Ca, Be
c. F, Cl, Br
d. O, Te, S
Answer:
a. Cs, Rb, Na
Explanation:
Electronegativity is the ability of an element to lose or gain electrons. It is expressed as a number that measures the relative tendency with which atoms of the element attract valence electrons in a chemical bond.
Across the periodic table, electronegativity increases except for the noble gasesIt decreases down the groupGroup 1 elements have the least electronegativityCs, Rb and Na all belongs to this groupThey are called the alkali metalsThey are the most electropositive group on the periodic table.How many liters of a 3 M NaOH stock solution would you need to make 552 mL of a 105 mM NaOH dilution
Answer:
0.01932 L
Explanation:
First we convert 105 mM to M:
105 mM / 1000 = 0.105 MNext we convert 552 mL to L:
552 mL / 1000 = 0.552 LThen we use the following equation:
C₁V₁=C₂V₂Where:
C₁ = 3 MV₁ = ?C₂ = 0.105 MV₂ = 0.552 LWe input the given data:
3 M * V₁ = 0.105 M * 0.552 LAnd solve for V₁:
V₁ = 0.01932 LThe thermite reaction ,
Fe2O3(s)+2Al(s)⟶2Fe(s)+Al2O3(s),ΔH∘=−851.5kJ/mol
is one of the most exothermic reactions known. Because the heat released is sufficient to melt the iron product, the reaction is used to weld metal under the ocean. How much heat is released per mole of Al2O3produced? How does this amount of thermal energy compare with the energy released when 2 mol of protons and 2 mol of neutrons combine to form 1 mol of alpha particles?
Answer:
Explanation:
1) The ΔH shows the heat of reaction of the reaction illustrated in the question and the negative sign shows the reaction is an exothermic reaction, meaning heat is released in this reaction. The amount of heat released in this reaction is 851.5 kilojoules per mole of Al₂O₃ produced.
2) The thermal energy of this reaction is however very low when compared to the energy released when 2 moles of protons and 2 moles of neutrons combine to form 1 mole of alpha particles. This is because, the reaction illustrated in the (1) above is a normal chemical reaction while the one that involves the protons and neutrons (as described in this section 2) is a nuclear reaction which involves large amount of energy. Nuclear reactions usually involve way larger amount of energy than ordinary chemical reactions.
Which of the following is true for an element that is oxidized during a redox reaction?
Group of answer choices
It gains electrons.
It gains protons.
It loses protons.
It loses electrons.
Answer:
It loses electrons.
Explanation:
When an atom is oxidized in a redox reaction, it simply loses electrons and the oxidation number increases.
An oxidized atom implies that oxidation has occurred; oxidation can be defined as:
addition of oxygen to a specieremoval of hydrogen from a specie loss of electron by an atomincrease in the oxidation number of an atomincrease in the number of electronegative atoms surrounding an element in changing from reactants to products.D. It loses electrons
Here's how it works!
Oxidation occurs when an atom, molecule, or ion loses one or more electrons. In the process of oxidation, the oxidation state of the chemical species increases. Originally, the term was used to describe when oxygen caused electron loss in reactions. I hope that helps you!
What does the theory of continental drift state?
A
All the continents were once one continent that broke up and drifted apart over hundreds of millions of years.
B
The continents have always been separate but may one day drift together to form a single continent.
C
The layout of the continents is the same today as it has always been.
D
New continents are continually being created and destroyed.