Answer: The volume needed at STP is 2.016 L
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}[/tex]
[tex]0.0900mol=\frac{x}{22.4L/mol}[/tex]
[tex]x=0.0900mol\times 22.4L/mol=2.016L[/tex]
Thus the volume needed at STP is 2.016 L
09. Where does Mitosis take place? I
where growth and repair are happening
in your hair cells only
in your blood cells only
Answer:
In plants mitosis takes place throughout life in growing regions called the meristems. Replacements as cells wear out. The cells of the skin and bone marrow are sites of active mitosis replacing skin cells and red blood cells that only have a limited life. Repair.
Explanation:
During life body pH is ___ shortly after death the pH becomes ___ after time the pH becomes ___. (A) Acidic, neutral, basic (B) Neutral, acidic, basic (C) Neutral, basic, acidic (D) Acidic, acidic, basic
what is a row of elements across the periodic table called
Answer:
a period
Explanation:
Answer: The row of elements across the periodic table is called "periods".
Explanation:
In the Periodic Table, there are seven rows of elements, which is called periods.
can energy transfer even if the objects are in the same temprature
Answer:
Yes
Explanation:
Kate made some ice cubes from pure water.
She used a sensor to measure the temperature of the ice.
What temperature will the sensor show when the ice is melting?
............. °C
Answer:
The correct answer is - 0 degrees Celsius or 32 degrees Fahrenheit.
Explanation:
The pure water freezes below zero degrees Celsius and forms ice which is started to melt at zero degrees Celsius as it gets the heat from the surroundings. The change in the heat or temperature of matter leads to a change in the state of matter.
Kate will find that the ice cubes formed from the pure water started to melt at 0 degrees Celsius or 32 degrees Fahrenheit with the help of sensor she has.
The level of a liquid (i.e. distilled water) in laboratory glassware is determined by sight. The level corresponds to a specific volume. The volume is established by identifying the meniscus of the liquid relative to a calibration mark or series of calibration marks on the glassware (i.e. volumetric flask vs. buret). Which of the following statements is NOT correct when reading the meniscus?
a. the edge of the meniscus should be used to determine volume relative to the mark or marks
b. the meniscus should be read at eye level
c. when the meniscus is between marks, estimate the reading to the nearest tenth of a division (ie, estimate to 0.01 mL if buret has 0.1 ml divisions)
d. the center of the meniscus should be used to determine volume relative to the mark or marks
Answer:
c. when the meniscus is between marks, estimate the reading to the nearest tenth of a division (ie, estimate to 0.01 mL if buret has 0.1 ml divisions)
Explanation:
When we put a liquid in a pipette, we can see that the surface of that liquid will have a curve. This curve is called the meniscus and it has the correct volume that an aqueous solution has. However, for this, it is necessary that the meniscus is observed at eye level and that its edges and center are clearly visible.
Heat will continue to move until the objects or areas have reached the same ______.
Answer: Thermal Equilibrium
Explanation:
Answer:
temperature
Explanation:
I think that's it i'm sorry if i'm wrong
2. Describe briefly of some ways these organisms might interact with
each other. (5 points)
The rate constant (k) for a reaction was measured as a function of temperature. A plot of ln k versus 1>T (in K) is linear and has a slope of -1.01 * 104 K. Calculate the activation energy for the reaction.
Answer:
8.397J/mol is the activation energy for the reaction
Explanation:
The graphical form of Arrhenius equation is:
ln k = -Ea/R*(1/T)+lnA
Where k is activation energy
Ea is activation energy
R is gas constant (8.314J/molK)
T is absolute temperature
And A is the pre-exponential factor.
The slope of the plot is -Ea/R:
-Ea/R = -1.01x10⁴K
-Ea/8.314J/molK = -1.01x10⁴K
Ea = -1.01x10⁴K*8.314J/molK
Ea = 8.397J/mol is the activation energy for the reaction
What type of tide would this arrangement of earth-moon-sun create?*
O full moon tide
O neap tide
O new moon tide
Ospring tide
HURRY!!!
Answer:
neap tide
Explanation:
There are two different types of tides, which are the spring tide and the neap tide.
Neap tides are weak tides which occur when the gravitational forces of the sun and the moon are at right angles to each other with respect to the earth. Since the sun and moon are at right angles, it causes a difference between the low and high tide.
The spring tide are strong tides which occur when the moon, sun and earth are in straight line. The spring tide occur during full moon and new moon.
Answer:
Neap Tides
The result is a neap tide. The same effect happens during third quarter. These occur during first and last quarter moons. The gravitational pull is not as strong.
Explanation:
the first answer is correct
A mixture of krypton and argon gas is compressed from a volume of to a volume of , while the pressure is held constant at . Calculate the work done on the gas mixture. Be sure your answer has the correct sign (positive or negative) and the correct number of significant digits.
Answer:
42556.5 J
Explanation:
THIS IS THE COMPLETE QUESTION BELOW;
A mixture of krypton and neon gas is compressed from a volume of 96.0L to a volume of 68.0L , while the pressure is held constant at 15.0atm . Calculate the work done on the gas mixture. Be sure your answer has the correct sign (positive or negative) and the correct number of significant digits.
The workdone on the gas can be calculated using below expresion,
W = - PΔV
Where P= Pressure of the mixture of the given gases
ΔV = Change in volume
Given;
Initial volume of the mixture= 96.0L
= 96.0L/ 1000= 0.096m³
Final volume of the mixture= 68.0L
= 68.0L/1000= 0.068m³
Pressure= 15.0atm, but we need to convert to N/m² for unit consistency.
1 atm= 101325 N/m²
15 atm = X
Cross multiply
X = (15×101325 )
X= 1519875 N/m²
P= 1519875 N/m²
W = - PΔV
W= - 1519875 × (0.068 - 0.096)
= - 1519875 × -0.028 m³
W= 42556.5 J
Is a bowling ball made of matter?
Answer:
Yes a bowling ball made of matter.
Explanation:
Show that, with appropriate coefficients, the two reactions can be summed to give the overall oxidation of SO2 by O2 to give SO3. Give the equation for the final overall oxidation of SO2 by O2 to give SO3 as your answer. Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
See explanation
Explanation:
We know that the process of the oxidation of SO2 to SO3 is catalysed by NO2 gas. It occurs in two stages and i will show the balanced reaction equation of the both stages below;
Step 1
2NO2(g) + 2SO2(g) ------> 2NO(g) + 2SO3(g)
Step 2
2NO(g) + O2(g) -------> 2NO2(g)
So, the overall reaction equation is;
2SO2(g) + O2(g) ------> 2SO3(g)
When a substance easily dissolves in a liquid, it has high solubility in that liquid. When a substance does not easily
dissolve in a liquid, it has low solubility in that liquid. Solubility of a gas in water describes how well the liquid can "hang
on" to gas, instead of releasing it into the air. Based on the results of your experiment, do you think that CO2 has a higher
solubility in hot water or cold water? Why?
Answer:
cold water because as temperature increases the less soluble co2 is in it
Explanation:
The ______ are new substances taht are created following a chemical reaction?
How many molecules of glucose are in 1.15 mol of glucose, C6H1206?
Answer: There are [tex]6.926\times 10^{23}[/tex] molecules of glucose.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the molecules, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadro's number}}[/tex]
[tex]1.15=\frac{x}{6.023\times 10^{23}}[/tex]
[tex]x=1.15\times 6.023\times 10^{23}=6.926\times 10^{23}[/tex]
Thus there are [tex]6.926\times 10^{23}[/tex] molecules of glucose.
Volume is the independent or dependent variable
Answer:
Independent
Explanation:
Independent Variable is the volume of the object. Dependent Variable is the mass of the object. So it
What is a net ionic equation?
A. An equation that shows all substances as compounds
B. An equation that is balanced on both sides
C. An equation showing only what is involved in the reaction
D. An equation that shows all dissolved compounds as ions
Answer:
I think it will option D hope it helps
Strontium metal reacts with aluminum chlorate to produce strontium
chlorate and aluminum metal. Identify the type of reaction, then write a
complete balanced chemical equation for the reaction. If no reaction
occurs, explain why. (2 points)
Answer: single replacement reaction, [tex]3Sr+2Al(ClO_3)_3\rightarrow 3Sr(ClO_3)_2+2Al[/tex]
Explanation:
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.
A general single displacement reaction can be represented as :
[tex]XY+Z\rightarrow XZ+Y[/tex]
As strontium metal is added to aluminum chlorate , strontium being more reactive than aluminium, displaces aluminium atom its salt solution and lead to formation of strontium chlorate and aluminum metal.
[tex]3Sr+2Al(ClO_3)_3\rightarrow 3Sr(ClO_3)_2+2Al[/tex]
what does GCAT help us remember?
What amount of heat, in kJ, is required to vaporize 163.45 g of ethanol (C₂H₅OH)? (∆Hvap = 43.3 kJ/mol)
Answer:
Amount of heat required = 153.62 J
Explanation:
Given:
Mass = 163.45 g
∆Hvap = 43.3 kJ/mol
Molar mass C₂H₅OH = 46.07 g/mol
Find:
Amount of heat required
Computation:
Amount of heat required = Number of moles x Molar mass C₂H₅OH
Amount of heat required = [163.45/46.07][43.3]
Amount of heat required = 153.62 J
Which of the following would be produced when two or more different atoms bond chemically?
O A. compounds
.
B. elements
C. solutions
D. mixtures
Answer:
When two or more atoms chemically bond with each other, the resultant chemical structure is a molecule. The familiar water molecule, H2O, consists of two hydrogen atoms and one oxygen atom; these bond together to form water, irdk but it's either C or D
Explanation:
hope this helps have a good rest of your day :) ❤
An unknown solid is added to water in a calorimeter. The temperature of the water increases. What does this say about the reaction? A) The reaction is exothermic. B) The reaction is endothermic. C) The reaction has absorbed heat from the solution. D) The reaction has released heat to the solution. E) Both A and D are correct.
Answer:
Option A is correct.
Option D is correct.
E is the correct answer
Explanation:
This a theoretical calorimetry problem that can be solved by thermodynamic concepts.
Our system is the unknown solid. If the temperature of water has increased, we can think, that the heat from the metal was absorbed by water, which is our surrounding. If in the analysis of the situation we use a calorimeter, knowing that it is an isolated system, which does not allow the entry or exit of heat, we can conclude that the heat released is equal to the heat absorbed.
In conclusion, the thermodynamic system is constituted by the chemical reaction. In this case, the surrounding is made up of water and the calorimeter itself.
If the reaction is exothermic, the heat released by the reaction will be absorbed by the surrounding . Then, the final temperature will be higher than the initial temperature. If the reaction is endothermic, the heat absorbed by the reaction will be released by the environment. So, the final temperature will be lower than the initial temperature.Iron is a metal. The structure of iron is described as a lattice of positive ions in a sea of
electrons. Which of the following statements about iron are correct?
1 iron conducts electricity because the electrons are free to move
2 iron has a high melting point due to the strong covalent bonds
3 iron is an alloy
4 iron is malleable because the layers of atoms can slide over one another
A. 1 only
B. 1 and 3
C. 1 and 4
D. 2, 3 and 4
Answer: 1and 4
Explanation: iron is an element not an alloy. An ionic lattice is not bonded covalently.
Which natural resource is limited in supply?
)
A)
wind
B)
petroleum
C)
water power
D)
solar energy
A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 263 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature.
Required:
What is the mole fraction of hexane?
Answer:
Xb = 0.59
Explanation:
Let's analyze the given data.
We have a total vapor pressure of 263 Torr for the mix of the two gases. And the individual vapour pressures for each gas is given, and it's 425 Torr for pentane and 151 Torr for hexane.
We are asked to determine the mole fraction of hexane. For practical purposes, we will label pentane as "a" while hexane would be "b". So, let's write the equations that we need to calculate this.
We know that the total pressure of a solution would be:
P = Pa + Pb (1)
And we also know that these individual pressures are:
Pa = Xa * Pa° (2)
Pb = Xb * Pb° (3)
Where Pa° and Pb° are the vapour pressures of each gases.
The mole fractions (Xa and Xb), can be expressed, one in function of the other:
Xa + Xb = 1 -----> Xa = 1 - Xb (4)
Now that we know this, we can replace (4) in (2), and then, (2) and (3) can be replaced in (1):
Pa = (1 - Xb)Pa°
P = (1 - Xb)Pa° + XbPb° (5)
Replacing the given data, we have:
263 = (1 - Xb)*425 + 151Xb
Now solving for Xb, which is the mole fraction of hexane:
263 = 425 - 425Xb + 151Xb
263 - 425 = (-425 + 151)Xb
-162 = -274Xb
Xb = -162 / -274
Xb = 0.59Hope this helps
What observations did you make when the hydrochloric acid and zinc were combined?
Answer:
Zn + 2HCl -----> ZnCl2 + H2
Explanation:
Zinc chloride and hydrogen gas is formed
When zinc was combined with hydrochloric acid, hydrogen gas was evolved.
We know that a general property of metals is that they react with metals to evolve hydrogen gas. All metals that are above hydrogen in the activity series will undergo this reaction.
Hence, when hydrochloric acid and zinc were combined, the following reaction occured; Zn(s) + 2HCl(aq) -----> ZnCl2(aq) + H2(g). The colorless odorless gas evolved after this combination is hydrogen gas.
Learn more: https://brainly.com/question/6179102
In a chemical reaction, reactants interact to form products. This process is summarized by a chemical equation. In the Balancing Chemical Equations Gizmo, look at the floating molecules below the initial reaction: H2 + O2 ???? H2O. 1. How many atoms are in a hydrogen molecule (H2)? 2. How many atoms are in an oxygen molecule (O2)? 3. How many hydrogen and oxygen atoms are in a water molecule (H2O)? 4. In general, what does a subscript (such as the "2" in H2) tell you about the molecule? 5. A chemical equation is balanced if the number of each type of atom on the left side is equal to the number of each type on the right side. Is this reaction balanced?
Answer:
See answer below
Explanation:
Let's write the equation again:
H₂ + O₂ ---------> H₂O
Now that we have written the equation, let's solve the exercise:
1. In this case, we first need to make a difference between atom and molecule. An atom is just a single element, a molecule it's when you have more than 1 element in a compound.
Knowing this, we have the H₂. In this case we only have one element, Hydrogen. However, as you can see in the expression, we have a number 2 as a subscript. The number 2 means that the hydrogen it's not alone, we do not have one hydrogen, we have two hydrogens, therefore, it becomes a molecule. Now, This molecule, according to the number 2 as subscript, means that the molecule of hydrogen have 2 atoms of hydrogens, and this formed the molecule, therefore, there are 2 atoms of hydrogens in H₂.
2. Following the same explanation of above, but using oxygen, we have the same thing, so, in a molecule of O₂, we have 2 atoms of oxygen.
3. The molecule of water is composed of Hydrogen and oxygen. As you can see, in this case we have 2 hydrogen and 1 oxygen, therefore, in 1 molecule of water, there are 1 atom of oxygen and 2 atoms of hydrogen.
4. The subscript, as you may know now, tell us the number of atoms that you have in a molecule or compound. This number also means, in different compounds the oxidation state of the atoms that conform the molecule.
5. No, the equation is not balanced, because we do not have the same number of oxygen on the side of the products. We need to balance that. As the oxygen is unbalanced, we just need to put numbers as coefficients, behind the molecule. This number will multiply the number of atoms of the referred molecule. So, doing this with the water on the products to equal the number of oxygen, we have:
H₂ + O₂ ---------> 2H₂O
But this 2, unbalance at the same time the number of hydrogens. We now have 4 hydrogens in the product, so, to balance this, we put a 2 on the reactants:
2H₂ + O₂ ---------> 2H₂O
Now the reaction is balanced.
Hope this helps
If one DNA strand reads CCGTAATGCAT, what will be the sequence of the complementary
strand?
Si una hebra de ADN lee CCGTAATGCAT, ¿cuál será la secuencia de la hebra
complementaria?
Write your answer here:
Escriba su respuesta aquí:
a) CCGTAATGCAT
b) GGCATTACGTA
c) CCGATTAGCTA
d) GGCTAATCGAT
If one DNA strand reads CCGTAATGCAT, the sequence of the complementary strand will be - b) GGCATTACGTA
Complementary base pairingThe nucleic acid sequence of bases can form a double-stranded structure by matching base pairs.Adenine matches with thymine (uracil in RNA) and vice versaGuanine matches with cytosine and vice versaFor example, the complementary sequence to C-A-T-G (where each letter stands for one of the bases in DNA) is G-T-A-C.So, DNA strand - C-C-G-T-A-A-T-G-C-A-T
Complementary DNA strand - G-G-C-A-T-T-A-C-G-T-A
Thus, If one DNA strand reads CCGTAATGCAT, the sequence of the complementary strand will be - b) GGCATTACGTA
Learn more:
https://brainly.com/question/3372278
5. Calcium carbide (CaC2) reacts with water, producing acetylene (C2H2): CaC2 + 2H2O -> Ca(OH)2 + C2H2
Production of 13g of C2H2 requires __________ g of H2O. a. 4.5 b. 9.0
c. 18 d. 4.8 x 102 e. 4.8 x 10-2
Answer: c
Explanation:
18
Answer:
17.99 g H2O
Explanation:
13 g C2H2(1 mol C2H2/26.04 g C2H2)(2 mol H2O/1 mol C2H2)(18.02 g H2O/1 mol H2O) = 17.99 g H2O used up