Answer:
1940K and 1939K Isotopes are two forms of the same element that have different numbers of neutrons in the nucleus. This means same symbol, and same atomic number (subscript), but different mass number (superscript).
A flask with a volume of 250.0 mL contains air with a density of 1.164 g/L. What is the mass of the air contained in the flask?
Answer:
convert 250.0 mL in Liters :250. 0 / 1000 = 0,25 LDensity = 1.240 g/LMass
Explanation:
A gallon of paint covers 350 square feet.
How many gallons must be bought to cover a room with two 16’ by 10’ walls and two 14’ by 10’ walls?
Can somebody who know how to do this solve this for me?
Answer:
2,137... gallons
Explanation:
(160+140+14x16x2)/350=2,137...
Question
Which of the following factors can affect the strength of electric or magnetic fields? (YOU MAY SELECT MORE THAN ONE ANSWER
The factors that affect the strength of electric or magnetic fields are loop count, the current, the wire size, and the presence of an iron core.
What is an electromagnetic field?Electromagnetic field is defined as the field that is made up of both the electric and magnetic field that can help in conduction of electricity.
The factors that affect the strength of electric or magnetic fields include the following:
loop count, the current, the wire size, and the presence of an iron core.Learn more about magnetic field here:
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A 2% sucrose solution is isotonic with 1.5% solution of an unknown substance. Calculate molecular mass of unknown substance.
The molar mass of the unknown substance is 256.6 g/mol.
What is the molar mass of sucrose?The molar mass of sucrose C12H22011 is 342 g/mol.
A 2% sucrose solution is isotonic with 1.5% solution of an unknown substance.
Molar mass of sucrose = Molar mass of unknown substance.
2% × 1000/342 = 1.5% × 1000/x
x = 342 × 1.5/2
x = 256.5 g/ mol
Therefore, the molar mass of the unknown substance is 256.6 g/mol.
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A piece of unknown solid substance weighs 44.7 grams and requires 2110 J to increase its temperature from 23.2 C to 89.6 C. What is the specific heat of the substance?
Answer:
silicon 0.712 J/g°C
Explanation:
i hope this helps you, sorry if im wrong, but this should be correct!
Answer:
.7109 j / gm-C
Explanation:
Specific heat = j/gm-C
j = 2110 gm = 44.7 C = ( 89.6-23.2) = 66.4
2110 /(44.7 * 66.4) = .7109 j/gm-C
How much energy is wasted by a 10% efficient filament bulb with 5 J of input?
Answer:
4.5 J wasted
Explanation:
10 % efficient means 90% wasted
90% of 5 J = .9 *5 = 4.5 J
How many grams of CO2 are produced if 2.09 moles of hydrochloric acid are reacted with
calcium carbonate?
Answer:
The molar mass of CO2 = 44.01 g/mol
Explanation:
Start with 2.09 moles of HCl and convert to moles of CO2 For every 2 moles of HCl used, 1 mole of CO2 is formed.
2.09 mol HCl •(1 mol CO2/2 mol HCl) = 1.045 mol CO2
Now convert moles of CO2 to grams using the molar mass.
1.045 mol CO2 • 44.01 g/mol = 45.99 grams CO2
3 significant figures = 46.0 grams CO2
Hope This Helped
Which statement best describes the role of oxygen in cellular respiration?
OA. Oxygen molecules are a waste product of electron flow.
B. Oxygen molecules form as ATP molecules are made.
OC. Oxygen molecules form as sugar molecules are broken down.
OD. Oxygen molecules are used to make water molecules.
The role of oxygen in cellular respiration is to make water molecules. hence, option (D) is correct.
What is Cellular respiration ?
Cellular respiration is the process in which cells break down molecules for energy.
The cells use oxygen to break down food in the form of glucose to produce water and release carbon dioxide.
During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water are created as byproducts.
In this reaction, energy is produced in the form of ATP that is used by the cell for its various activities.
Thus the correct answer is option D.
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Where does most of our heat come from?
Answer:
the cells in your body
Explanation:
Most people that i have asked this similar question to, have said the sun. It's not the sun because the sun disappears at night. Your body produces heat because your cells are burning up energy.
What is the mass number of a single atom of magnesium-25?
Answer: It is approximately 24.985837
does a displacement reaction take place in iron + sodium chloride? and if so why?
Answer:
No.
A more reactive metal displaces or pushes out a less reactive metal from its compound. In the reactivity series, sodium is more reactive than iron hence no displacement reaction will occur.
A student prepares a solution of Potassium Nitrate (KNO3) containing 95g at 40 C. This solution is -
A.) Saturated
B.) Unsaturated
C.) Supersaturated
D.) None of the Above
From the solubility curve as shown, the solution of 95g at 40 C can be said to be unsaturated.
What is a saturated solution?The term saturated solution has to do with a solution which contains just as much solute as it can normally hold at a particular temperature.
Looking at the solubility curve as shown, the solution of 95g at 40 C can be said to be unsaturated.
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Jeff is chasing his brother running 12m/s.He speeds up to 21m/s over 15 seconds.What is the acceleration?
Answer:
a = 0.6 m/s² .
Explanation:
given that:
• Vi = 12m/s
• Vf = 21 m/s
• t = 15 s
• a = ?
∴ a = (Vf - Vi) / t
⇒ a = (21 - 12) / 15
⇒ a = 0.6 m/s² ...answer...
Note that:
▪ 'Vf' refers to final velocity
▪ 'Vi' refers to initial velocity
▪ 't' refers to time period
▪ 'a' refers to acceleration
hope that helps...
100
Cut a 7-inch-diameter circle out of cardstock. Draw a spiral on the circle as shown. Next, use the scissors to cut along the lines you drew starting on the outside and ending in the center. Use the hole punch or scissors to make a hole at the middle of the spiral and attach the thread with a knot. Tie the other end of the thread loosely around the center of the stick so you can suspend the spiral in the air. Fill the pot with 2 inches of water. Heat the water until it boils, and then turn off the heat source. Let the pot sit for 4 minutes. Holding the ends of the stick with the spiral attached, position the bottom of the spiral right above the top of the pot so it’s not touching the water. Describe what happens.
Enter your answer to Part A here:
The heat will go up right above the top of the pot and then will go through the hole in the centre.
What is heat?Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.
Conduction is probably the most basic and intuitive way of achieving heat transfer. Something hot touches something cool and the cool thing heats up. For instance, the water in a pot boils when the flame from the stovetop heats the pan, and the heat from the pan is transferred to the water via conduction.
Thus, the heat will go up right above the top of the pot and then will go through the hole in the centre.
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Which of the following is the name given to a carbohydrate containing one monomer?
O Decasaccharide
O Polysaccharide
Disaccharide
Monosaccharide
NEXT QUESTION
ASK FOR HELP
Answer:
Monosaccharides
A monosaccharide is the monomer of a carbohydrate. Carbohydrates, such as sugars and starches, store energy. Others, such as cellulose and chitin, are structural in nature.
Answer:
monosaccharide
Explanation:
a monosaccharide is the monomer of carbohydrates.
Substrate: N-benzoyl-L-tyrosine ethyl ester (BTEE) 0.001M in 50% aqueous
her
methanol.
Buffer:0.1M tris-HCl, pH 7.8, containing 0.1M CaCl₂.
Enzyme:1mg/ml chymotrypsin A in 0.001M HCI.
N.B. The enzyme provided is a stock solution which should be diluted 50-fold with
0.001M HCl immediately before use.
How do I do this calculation abs the final volume should be 5ml
0.1 mL of the stock solution of the enzyme is taken and made up to 5.0 mL with 0.001M HCl in order to prepare a 50-fold diluted enzyme.
What is dilution?Dilution is a process of making a solution of lower concentration from a solution of higher concentration by the addition of solvent to a given volume of the solution of higher concentration.
Dilution of solutions is done using the dilution formula in order to determine the given volume of diluent or stock solution required. The dilution formula is given below:
C1V1 = C2V2where:
C1 = Initial concentration of enzymeC2 = Final concentration of enzymeV1 = Initial volume V2 = Final volumeFor the enzyme dilution;
C1 = 1 mg/mL
C2 = 1/50 mg/ml = 0.02 mg/ml
V= ?
V2 = 5 ml
V1 = C2V2/C1
V1 = 0.02 * 5/1 = 0.1 mL
Therefore, 0.1 mL of the stock solution of the enzyme is taken and made up to 5.0 mL with 0.001M HCl in order to prepare a 50-fold diluted enzyme.
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2. What is the concentration of hydrochloric acid?
Use the ideal gas law to calculate the pressure inside of a 1L compressed gas tank, with a temperature of 273.15K filled with 13moles of CO2
Question options:
A. 567.74 kPa
B. 21.01 kPa
C. 3550.95 kPa
D. 0.05 kPa
Answer:
P = 29,523 kPa
Explanation:
The formula of the Ideal Gas Law is:
PV = nRT
In this formula,
P = pressure (kPa)
V = volume (L)
n = number of moles
R = 8.314 (L*pKa/mol*K)
T = temperature (K)
You have been given values for all of the variables but pressure. Therefore, you can plug the given values into the equation and simplify to find pressure.
PV = nRT
P(1 L) = (13 moles)(8.314 L*kPa/mol*K)(273.15 K)
P(1 L) = 29523
P = 29,523 kPa
**I am pretty certain my math is correct. I also checked with an ideal gas law calculator and got this same answer. Either I am missing something or some of the values are wrong. Hopefully this explanation helps clear something up though.**
If the half life of Krypton is 3.16 minutes, what is the time needed for a sample of Krypton to decay so that 1/8th of its original amount remains
Answer:
.......................................
1. Related to the number of particles in a gram of
substance and to possible motions of the
particles (2 words)
Answer:
Avogadro's number or Avogardro’s constant
Explanation:
I’m pretty sure this is correct if it’s not I’m sorry lol.
Fill in the blanks
1. Soil is an important - _______resource
2. For soil formation to take place, bare rocks initially need to breakup as a result of -________- process
3 The uppermost layer of earth's crust in which plant grow is called________
Answer:
1.natural 2.weathering 3.soil
It took 55 days for a radioactivity of 1.75 x 1012 Bq to remain 0.135 Ci. What is the half-life of this radioactivity?
From the calculations, we can see that the half life of the material is 11.4 days
What is radioactivity?The term radioactivity refers to the spontaneous disintegration of a radioactive nucleus. The time taken for half of the radioactive material to remain.
Given that;
N/No = (1/2)^t/t1/2
N = amount that remained
No = amount that remained in the beginning
t = time taken
t1/2 = half life of the substance
N =Noe^-kt
4.995 ×10^9 = 1.75 x 10^12e^-55k
3.5* 10-2=e^-55k
k = ln3.5* 10-2/-55
k =0.06095
t1/2 = 0.693/0.06095
t1/2 = 11.4 days
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Helium occupies 293 mL at 788 Torr and 25C. If the sample is condensed into a 0.115 liter flask, what will the new pressure be, assuming constant temperature?
Answer:
=2007.69 Torr
Explanation:
The new pressure of helium gas assuming constant temperature is equal to 2007.69
Torr.
Given the following data:
Initial volume = 293 mL
Final volume = 0.115 L
Initial pressure = 788 Torr
Temperature = 25°C.
Conversion:
Initial volume = 293 mL to L = 293/1000=0.293L
To determine the new pressure assuming constant temperature, we would apply Boyle's law:
Mathematically, Boyle's law is given by the formula;
PV=K
P1V1=P2V2
Where;
P1 is the original (initial) pressure.
P2 is the final pressure.
V1 is the original (initial) volume.
V2 is the final volume.
Substituting the given parameters into the formula, we have;
788×0.293 = P2 × 0.115
230.884 = 0.115P2
P2 = 230.884/0.115
P2 =2007.69
ASAP 100 POINTS Which molecules carries instructions for inherited traits
A.DNA
B CARbohydrate
C.Protein
D.Lipid
Answer:
A.DNA
Explanation:
Ahaa Its gona be right
Answer:
D.N.A.
Explanation:
Hi student! Let me help you out on this question.
D.N.A. is the molecule which carries instructions for inherited traits.
[tex]\therefore,Option\quad A \quad is \quad correct[/tex]
Hope that this helped! have a good day ahead.
If you dissolve 1.78 g of MgSO4 (Mm = 120.4 g) in 1.10 L of water, what is the molarity of the solution? (Report your answer to four places past the decimal point)
The molarity of the solution given the data from the question is 0.0135 M
What is molarity?
Molarity is simply defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of MgSO₄ Mass of MgSO₄ = 1.78 gMolar mass of MgSO₄ = 120.4 g/mol Mole of MgSO₄ =?Mole = mass / molar mass
Mole of MgSO₄ = 1.78 / 120.4
Mole of MgSO₄ = 0.0148 mole
How to determine the molarity Mole of MgSO₄ = 0.0148 mole Volume = 1.1 L Molarity =?Molarity = mole / Volume
Molarity = 0.0148 / 1.1
Molarity = 0.0135 M
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Please show steps Thanks
Answer:
2.5M
Explanation:
First calculate the gram-formula mass of CaCO3 (add up the mass of each element in the compound)
40.1 + 12.01 + 16(3) = 100.11
Now use the mole calculation equation on Table T and plug in the numbers
(Keep in mind that 25 is the given mass)
25/100.11 = 2.497 or 2.5M
What is the density of helium at 0.975 atm and 27.0 C?
Answer:
0.158g/L.
Explanation:
MM of helium gas or He =4 g/mol
P = 0.974 atm
T = 27 °C, but we need absolute temperature.
TK = TC + 273
T = 27 + 273 = 300 K
m/V = (4 g/mol · 0.975 atm) / (0.0821 L·atm/mol·K · 300 K)
m/V = 0.975/6.1575 g/L
m/V = 0.158g/L
Answer: The density of the helium is 0.158g/L.
The diagram shows the potential energy changes for a reaction pathway. (10 points)
A curved lined graph is shown. The y axis of the graph has the title Potential Energy. The x axis of the graph has the title Reaction Pathway. The graph curve begins at a higher level and ends at a slightly lower level. A vertical line labeled A, starting from the x axis till the beginning of the graph line is shown. A vertical line labeled B, starting from the x axis till the uppermost hump in the graph curve is shown. Another vertical line labeled C is shown from starting from the x axis till the point where the graph curve ends.
Part 1: Does the diagram illustrate an endothermic or an exothermic reaction? Give reasons in support of your answer.
Part 2: Describe how you can determine the total change in enthalpy and activation energy from the diagram and if each is positive or negative.
1) The diagram shows an exothermic reaction since the potential energy of the products is less than that of the reactants, meaning energy was released.
2) To find the change in enthalpy, determine the difference between the potential energy of the products and the potential energy of the reactants. (on this diagram, C-A) To find the activation energy, find the difference between the potential energy of the reactants and the "peak" of the curve (on this diagram, B-A). For this diagram, both the enthalpy and activation energy are positive.
Answer:
Part 1 and Part 2 Answer
Explanation:
Part 1:
The reactions have higher potential energy than the products, this means it is an exothermic reaction.
Part 2:
Change in enthalpy is determined by the difference between potential energy of the reactants (A) and potential energy of the products (C). Because the reactants is higher than the products' and we know the reaction is exothermic, the change in enthalpy will be negative (-∆H).
The activation energy can be determined by the difference between the peak of the graph (B) and the potential energy of reactants (A). The activation energy would be positive.
What type of reaction is the transformation of oxalacetic acid into malic acid?
[tex]NADP{{H}_{2}}[/tex] is required for the transformation of oxaloacetic acid into malic acid.
What is malic acid?Malic acid is sour and acidic. This helps to clear away dead skin cells when applied to the skin.
The conversion of oxaloacetic acid into malic acid takes place in [tex]C_4[/tex]plants through the [tex]C_4[/tex] cycle by the process of photosynthesis.
Carboxylation of pyruvate produces oxaloacetate (OAA). This is an energy-requiring reaction that uses adenosine triphosphate (ATP).
Hence, [tex]NADP{{H}_{2}}[/tex] is required for the transformation of oxaloacetic acid into malic acid.
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The number of neutrons in Aluminum is
the number of neutrons in aluminium is 14
Answer:
14
Explanation:
number of neutrons in an atom is difference between mass number and atomic number
atomic number of Al is 13 and mass number of Al is 27
number of neutrons = 27 - 13 = 14