The biological molecules that transport other substances are the proteins.
What are proteins?Proteins are biological macromolecules that contains nitrogen in their molecules and are the building block of a living organism.
The proteins perform the following functions:
they transport other substances,provide structural support,cause the movement of muscles, and catalyze chemical reactions in living organisms.Learn more about protein here:
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Which of the following is an aldehyde
Select the correct answer. if two half-lives have passed since a scientist collected a 1.00-gram sample of u-235, how much u-235 is left now? a. 0.001 g b. 0.100 g c. 0.250 g d. 0.450 g e. 3.00 g
Answer:
0.25 g of U-235 isotope will left .
Formula used :
where,
N = amount of U-235 left after n-half lives = ?
= Initial amount of the U-235 = 1.00 g
n = number of half lives passed = 2
0.25 g of U-235 isotope will left .
density is ______ to pressure
Answer:
When pressure increases, density increases.
When the pressure decreases, density decreases.
When density increases, pressure increases.
When density decreases, the pressure decreases.
Explanation:
Where and how does most heat loss occur in a thermos bottle? _________
Answer:
neck
Explanation:
through the neck and opening of the thermos, where there is no vacuum.. hence heat is easily transmitted resulting into heat loss
If 33.9 ml of h3po4 neutralizes 23.4 ml of 2.28 m koh, what is the molarity of the phosphoric acid?
Answer: 1.57 M
Explanation:
[tex]M_{A}V_{A}=M_{B}V_{B}\\(33.9)M_{A}-=(23.4)(2.28)\\M_{A}=\frac{(23.4)(2.28)}{33.9}=\boxed{1.57 \text{ M}}[/tex]
At what temperature would 0.46 moles of a gas occupy 13.3 L if the pressure is 734 mm Hg?
Answer: 341.6k
Explanation:
R= 0.0821
n= 0.46moles
v= 13.3L
p= 734mmhg = 734/760 = 0.97
[tex]T = \frac{p*v}{n*R}[/tex]
[tex]T = \frac{0.97*13.3}{0.46*0.0821}[/tex]
T= 341.6k
Answer:
10100101
Explanation:
this is for the other person alt.
How do you know which element the little number (subscript) goes with?
Answer:
you will not
Explanation:
the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.
there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1
Answer:
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.
Which sample contains more atoms:
3.89 g of nickel or 6.61 g of silver?
Defend your answer.
what controls the volumes of water in each cylinder once equilibrium is established?
The increase in volume shift the equilibrium towards making more moles of gas, decrease in volume shift the equilibrium towards producing fewer moles of gas.
What is equilibrium?The equilibrium of the gas is based on the pressure of the gas. With the increase in pressure, the equilibrium moves towards making fewer molecules of gas.
The gas equilibrium is proportional to the equilibrium K.
Increase in volume shift the equilibrium towards making more moles of gas, decrease in volume shift the equilibrium towards producing fewer moles of gas.
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What is the molar mass of unknown gas has a mass of 153 g and occupies 15 L at a temperature of 300 K and a pressure of 2 atm.
135 g/mol
17 g/mol
125 g/mol
160 g/mol
125 g/mol is the molar mass of unknown gas. Hence, option C is correct.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
First, calculate the moles of the gas using the gas law,
PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.
Given data:
P= 2 atm
V= 15 L
n=?
R= [tex]0.082057338 \;L \;atm \;K^{-1}mol^{-1}[/tex]
T=300 K
Putting value in the given equation:
[tex]\frac{PV}{RT}[/tex]=n
n= [tex]\frac{2 \;atm\; X \;15 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X 300}[/tex]
Moles = 1.21866 moles
Now,
Moles =[tex]\frac{mass}{molar \;mass}[/tex]
1.21866 =[tex]\frac{153 g}{molar \;mass}[/tex]
Molar mass= 125.54 mole/gram
125 g/mol is the molar mass of unknown gas. Hence, option C is correct.
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Current passes through a solution of sodium chloride. In 1. 00 second, 2. 68×1016na ions arrive at the negative electrode and 3. 92×1016cl− ions arrive at the positive electrode
The answer is the current passing between the electrodes is 10.56 mA., the direction of current is towards the negative electrode.
What is Electric Charge ?Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.
Electric charge can be positive or negative (commonly carried by protons and electrons respectively).
Like charges repel each other and unlike charges attract each other
Given that,
Number of sodium ions at the negative electrode, Na⁺ = 2.68 *10¹⁶
Number of chloride ions at the positive electrode,Cl⁻ = 3.92 *10¹⁶
(a) The current flowing in the circuit is due to the positive as well as negative charges such that total charge becomes:
Q= n e
Q = (Na⁺ +Cl⁻) e
Q= (2.68 *10¹⁶ +3.92 *10¹⁶) (1.6*10-19)
Q = 0.01056 C
The current is given by :
I=Q/t = 0.01056 /1 = 10.56mA
So, the current passing between the electrodes is 10.56 mA.
b) Since, positive ions are moving towards the negative electrode.
And, current is the flow of ions or electrons therefore, the direction of current is towards the negative electrode.
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The current is given by :
So, the current passing between the electrodes is 10.56 mA.
(b) The direction of electric current is towards negative electrodes.
Problems that I am stuck on! Need the answers asap
Answer:
1.b
2.b
3.a
4.a
Explanation:
use the rate laws when answering this.
What can you determine about the feasibility of a reaction if the enthalpy is positive and
the entropy is positive?
A. The Gibbs energy will always be positive, and the reaction will never be feasible.
B. The Gibbs energy will always be negative, and the reaction will always be feasible.
OC. The reaction could be feasible above a certain temperature.
D. The reaction will usually occur because it is unlikely the entropy will be greater than the enthalpy.
Reset Selection
If the enthalpy is positive and the entropy is positive, the Gibbs energy will always be positive, and the reaction will never be feasible.
What is the Gibbs Free Energy?The Gibb Free Energy is used to obtain the feasibility of a reaction. If the Gibbs free energy is positive the reaction is not spontaneous. If the value is negative, the reaction is spontaneous while a zero values indicates equilibrium.
From the equation;
ΔG = ΔH - TΔS, it follows that if the enthalpy is positive and the entropy is positive, the Gibbs energy will always be positive, and the reaction will never be feasible.
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Which of these factors should remain constant in a simulation of natural
selection?
OA. The ratio of females to males
OB. The individuals observed
OC. The number of generations studied
OD. The population observed
SUBMIT
Solve the combined gas law problem
P₁ = 1.5 atm
V₁ = 3.0 L
T₁=20.0 °C
P2 = 2.5 atm
V₂ = ? L
T2 = 30.0 °C
Combined gas equation: P1V1/T1 = P2V2/T2
Solving for V2:
V2 = P1V1T2/P2T1
T1 = 20 °C = 293.15 K
T2 = 30 °C = 303.15 K
V2 = (1.5 × 3.0 × 303.15)/(2.5 × 293.15)
V2 = 1.86 L
What is the percent yield if the quantity of reactants is sufficient to produce 0.86g of
NaCl but only 0.71g is obtained?
Taking into account definition of percent yield, the percent yield for the reaction is 82.56%.
Definition of percent yield
The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
[tex]percent yield= \frac{actual yield}{theorical yield}x100[/tex]
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Percent yield for the reaction in this case
In this case, you know:
actual yield= 0.71 gramstheorical yield= 0.86 gramsReplacing in the definition of percent yields:
[tex]percent yield= \frac{0.71 g}{0.86 g}x100[/tex]
Solving:
percent yield= 82.56%
Finally, the percent yield for the reaction is 82.56%.
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When iron rusts the iron atoms (Fe) form iron(III) ions (Fe³⁺)
Fe(s) -------> Fe³⁺(aq) + 3e˗
Water and oxygen are required for iron to rust.
Write the equation for water and oxygen reacting to form hydroxide ions (OH-(aq)) ions.
Answer:
H20+O2>2FeOH this is the right answer
what kind of intermolecular force is KI(aq)
Answer:
dipole-induced dipole forces
Explanation:
KI(aq) has potassium and iodine ions in water. Water is a polar molecule. So the type of force must be ion-dipole.
Which description is true of 0.02 m ca(oh)2 if ca(oh)2 completely dissociates in water?
If [tex]Ca(OH)_2[/tex] completely dissociates in water, it means it is a dilute strong base.
What is a base?A base is a substance that can neutralize the acid by reacting with hydrogen ions.
An acid is a substance that donates hydrogen ions and a base is a substance that accepts hydrogen ions.
Ca(OH)₂ does not have hydrogen ions to donate, but it can accept hydrogen ions to form H₂O according to this equation:
H⁺ + OH⁻ → H₂O.
Hence, Ca(OH)₂ is a base.
A strong base is a base that dissociates completely into metallic and hydroxide ions in aqueous solutions, while a weak base dissociates partially.
Hence, Ca(OH)₂ is a strong base.
Dilute refers to a solution meaning that the substance is not pure and the concentration is low. Since the solution the Ca(OH)₂ is 0.02 M means that it is diluted.
Therefore, we have found that the description of 0.02 M Ca(OH)₂ is a dilute strong base.
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how many moles are in 92.5 liters of c2h6 (ethane) gas Explain
Since we know the atomic masses of the elements, we can sum the atomic masses to obtain the molecular masses. We also know that 1 mole of C atoms weighs 12.01 g and 1 mol of H atoms weighs 1.0079 g. So, we know the molar mass of ethane also. Or, 30.07 g in 1 mole C2H6.
How can you measure the volume of air inside of a balloon?
You could let the air out of the balloon while it is under the water with a container filled with water upside down over it. And measure the water displacement.
Which part of John Dalton theory is no longer accepted today
The indivisibility of an atom was proved wrong and no longer accepted today.
What is an atom?An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons.
Hence, an atom is the smallest particle that takes part in chemical reactions.
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The production of carbon-14 ___
Pic attached
The production of carbon-14 occurs to a large extent in nuclear reactors.
Hence, option D is correct
What is carbon-14?Carbon-14 is a weakly radioactive isotope of Carbon; also known as radiocarbon, it is an isotopic chronometer.
Carbon-14 is produced in the stratosphere by nuclear reactions of atmospheric nitrogen with thermal neutrons produced naturally by cosmic rays (with the highest production rate 10 to 13 miles above Earth's poles), as well as by atmospheric nuclear weapons testing in the 1950s and '60s.
Hence, option D is correct
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Water and ammonia molecules are roughly the same size and the same mass but ammonia boils at -28F (-33C) and water boils at 212F (100C). What can we conclude about the intermolecular forces between water and ammonia?
We can infer that there are various intermolecular forces between water and ammonia.
The intensity of the intermolecular interactions between a substance's molecules affects its boiling point. Although water and ammonia have comparable molecular sizes and weights, their boiling points differ considerably. This implies that the intermolecular interactions between ammonia and water are different.
The powerful intermolecular force of hydrogen bonding causes water molecules to be drawn to one another. When the hydrogen atom of one water molecule is drawn to the oxygen atom of another water molecule, hydrogen bonding takes place.
As a result, the water molecules are held together by a web of intermolecular forces. These hydrogen bonds need a lot of energy to form. Consequently, water has a high boiling point.
On the other hand, dipole-dipole interactions between molecules occur between ammonia molecules. The nitrogen atom in the polar molecule ammonia (NH3) is more electronegative than the hydrogen atoms.
The hydrogen atoms are somewhat positively charged as a result of this polarity, while the nitrogen atoms are partially negatively charged. Ammonia has a lower boiling point because the dipole-dipole interactions between its molecules are less than the hydrogen bonds in water.
As a result, we can infer that the intensity of the intermolecular forces between water (hydrogen bonding) and ammonia (dipole-dipole interactions) differs based on the drastically different boiling temperatures of the two substances.
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y-4x=2 find the slope
Calculate the pKa of lactic acid (CH3CH(OH)COOH) given the following information. 3.005 grams of potassium lactate are added to 100. mL of a 0.500 M lactic acid solution producing a pH of 3.526.
Answer:
[tex]\displaystyle \text{p} K_a \approx 3.856[/tex]
Explanation:
Because 3.005 grams of potassium lactate is added to 100. mL of solution, its concentration is:
[tex]\displaystyle \begin{aligned} \left[ \text{KC$_3$H_$_5$O$_3$}\right] & = \frac{3.005\text{ g KC$_3$H_$_5$O$_3$}}{100.\text{ mL}} \cdot \frac{1\text{ mol KC$_3$H_$_5$O$_3$}}{128.17 \text{ g KC$_3$H_$_5$O$_3$}} \cdot \frac{1000\text{ mL}}{1\text{ L}} \\ \\ &= 0.234\text{ M}\end{aligned}[/tex]
By solubility rules, potassium is completely soluble, so the compound will dissociate completely into potassium and lactate ions. Therefore, [KC₃H₅O₃] = [C₃H₅O₃⁺]. Note that lactate is the conjugate base of lactic acid.
Recall the Henderson-Hasselbalch equation:
[tex]\displaystyle \begin{aligned}\text{pH} = \text{p}K_a + \log \frac{\left[\text{Base}\right]}{\left[\text{Acid}\right]} \end{aligned}[/tex]
[Base] = 0.234 M and [Acid] = 0.500 M. We are given that the resulting pH is 3.526. Substitute and solve for pKₐ:
[tex]\displaystyle \begin{aligned} (3.526) & = \text{p}K_a + \log \frac{(0.234)}{(0.500)} \\ \\ 3.526 & = \text{p}K_a + (-0.330) \\ \\ \text{p}K_a & = 3.856\end{aligned}[/tex]
In conclusion, the pKₐ value of lactic acid is about 3.856.
can someone help me here please
Answer:
150 mL4560 torrExplanation:
Applying Boyle's Law :
Q1
P₁V₁ = P₂V₂1.5 x 500 = 5 x V₂V₂ = 500/5 x 1.5V₂ = 100 x 1.5V₂ = 150 mLQ2
P₁V₁ = P₂V₂1 atm = 760 torr4 x 1.5 x 760 = 1 x P₂P₂ = 6 x 760P₂ = 4560 torrWrite the balanced equations for the following nuclear reactions.
ASAPPP
[tex]^{233}_{92}U\;\rightarrow\;^4_{2}He\;+\;^{229}_{90}Th[/tex] is the balanced equations for the following nuclear reactions.
What are balanced equations?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products
Uranium-233 is produced by the neutron irradiation of thorium-232. When thorium-232 absorbs a neutron, it becomes thorium-233, which has a half-life of only 22 minutes.
Hence, [tex]^{233}_{92}U\;\rightarrow\;^4_{2}He\;+\;^{229}_{90}Th[/tex] is the balanced equations for the following nuclear reactions.
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Which organisms reproduce through a...se...xu...al reproduction? (Select all that apply.)
starfish
yeast
fungi
bacteria
PICK MORE THAN ONE and no links please
Answer:
Bacteria by binary fission
Starfish
Fungi
Explanation:
[tex]\large{\underline{\underline{\pmb{\frak {\color {blue}{Answer:}}}}}}[/tex]
Organisms which apply binary fission are:
Starfish FungiBacteria[tex]\green\star[/tex]More things to learn about reproduction:
[tex]\blue\star[/tex]There are two modes of reproduction. They are:
Asèxual mode andSèxual modeAsèxual mode: The mode of reproduction where single parent is enough to give birth another organisms. Eg: Amoeba
Sèxual mode: The mode of reproduction where both parents, male and female are necessary. Eg: Human.
[tex] \boxed{ \frak \red{have \: a \: nice \: day}}[/tex]
What is the name of this structural formula?
Answer:
Methylamine
Explanation:
First count how many carbons there are (there's one). This will give the prefix meth-
Next we can see that this is in the organic functional group amine, as it has a nitrogen at the end with no oxygens. This will give it the suffix -amine.
Now we can give this compound a name:
Methylamine
(the yl is a suffix to make the meth- prefix complete)