Answer:
Option B. 3.0 M
Explanation:
From the question given above, the following data were obtained:
Volume of solution = 3.0 L
Mole of MgCl₂ = 9 moles
Molarity =?
Molarity can simply be defined as the mole of solute per unit litre of the solution. Mathematically, it can be expressed as:
Molarity = mole of solute /Volume of solution
With the above formula, we can obtain the molarity of the solution as follow:
Volume of solution = 3.0 L
Mole of MgCl₂ = 9 moles
Molarity =?
Molarity = mole of solute /Volume of solution
Molarity = 9 / 3
Molarity = 3 mol/L = 3.0 M
Thus, the molarity of the solution is 3 M
What is the percentage of the actual yield of the reaction of 2.5 mol of Fe(NO3),
with 3.6 mol of Na2Co3, to form 6.3 mol of NaNO3 according to the reaction :
2Fe(NO3)3 + 3NaC03 - >
Fe2(CO3)3 + 6NaNO3 ?
Answer:
Percent yield = 87.5%
Explanation:
Given data:
Number of moles of Fe(NO₃)₃ = 2.5 mol
Number of moles of Na₂CO₃ = 3.6 mol
Actual yield of NaNO₃ = 6.3 mol
Percent yield of NaNO₃ = ?
Solution:
Chemical equation:
2Fe(NO₃)₃ + 3Na₂CO₃ → Fe₂(CO₃)₃ + 6NaNO₃
now we will compare the moles of both reactant with NaNO₃.
Fe(NO₃)₃ : NaNO₃
2 : 6
2.5 : 6/2×2.5 = 7.5
Na₂CO₃ : NaNO₃
3 : 6
3.6 : 6/3×3.6 = 7.2
Theoretical yield of NaNO₃ is 7.2 mol.
Percent yield:
Percent yield = actual yield / theoretical yield ×100
Percent yield = 6.3 mol / 7.2mol ×100
Percent yield = 87.5%
_______ are white blood cells that recognize specific antigens, and ultimately destroy them.
O lymphocytes
O pathogens
O water
Answer:
Lymphocytes
Explanation:
Pathogens are particles that make you sick like bacteria, viruses, amoebas. Water is essential for life but that's for metabolism, not fighting off against infection or viruses.
Answer:
Lymphocytes
Explanation:
lymphocytes are a kind of white blood cell (WBC). Lymphocytes are cells of the immune system and help fight infection. Lymphocytes live in lymph nodes, but also in the bloodstream and all over the body. Lymphocytes come in two main types: B-cells and T-cells
Where as water is totally not white blood cells and pathogens are viruses and bacterium
Iodine-131 is a radioactive material that plays a role in natural gas production and has a half-life of 8 days. A 320-mg sample of iodine-131 will decay to 250 mg after approximately days.
Time of decays approximately 2.853 days
Further explanationGiven
mass = 320mg iodine-131
No=320 mg
Nt=250 mg
t1/2 = 8 days
Required
t=time of decays
Solution
General formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]
Input the value
[tex]\tt 250=320.\dfrac{1}{2}^{t/8}\\\\log\dfrac{25}{30}=t/8.log~0.5\rightarrow t=2.853~days[/tex]
All of the following are examples of matter EXCEPT
A. Bugs
B. Electricity
C. Soda
D. Air
Answer: Electricity
Explanation: Electricity is the movement of matter. not matter itself
what is the molar mass of the chemical CH3COOH?
Answer:
60 g/ mol
Explanation:
Carbon, C 12
Hydrogen, H 1
Oxygen, O 16
Molar mass = 12+3+12+16+16+1 = 60 g/ mol
How can you avoid the formation of a supersaturated solution?
How to make super saturated solution?
An aqueous solution can be rendered supersaturated by first dissolving the solute in water at an elevated temperature using enough to give a concentration just under its solubility at that temperature. After the last of the solute crystals have dissolved the solution is cooled.
Answer:
By adding water i guess
Suppose a highly positive ion was attracted to a membrane. At what location would that most likely occur? a) the head of a lipid b) the tail of a lipid c) the nonpolar portion of a protein d) the double bond located within a lipid
Answer:
A highly positive ion was attracted to a membrane and their locations is explained in details.
Explanation:
1.
The Head of a lipid is hydrophilic (polar). This cover can be bearing negative or positive charges. This is that charge that creates the head hydrophilic(communicate with water(a polar molecule, including negative and positive unfair charges).
The tail is hydrophobic (non-polar). This part doesn't include any charge that enhances hydrophobic. (Does not combine with water.
Now a positive ion can be brought only to electron-rich stations. We cannot say that this situation is forever the hydrophilic part.
A dual bond is an electron-rich situation. So the ion will be drawn to the dual bond place of a lipid.
2.
A conveyor that needs energy is active transport.
3.
The use of a membrane is to stop the particles and ions from passing crosswise it openly. So through the membrane, in an active carrier, we require input energy to transfer molecules beyond it.
what is the difference between cell and cellmembrane
Answer:
So, a cell, in easiest terms, is "the building blocks of life". Without cells, humans, plants, animals, and anything else that has a cell would not be able to survive. Cells are extremely important to our bodies. Whereas a Cell Membrane is an organelle inside a cell. The Cell Membrane's job is to provide protection for the cell, as well as deciding which substances can enter and exit the cell.
I hope this helps!
25% While standing in line, a student notices that some students are really tall, some are approximately her height, and others are very short. From her observations, what could be a logical inference for the variations in height? A The tall students are taking growth steroids. B The short students are not eating the proper foods. с The height of the students is inherited from their parents. D The height of the students cannot be determined from the observations. 9 > E
Answer:
b
Explanation:
the answere is b
Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what could be the reason?
Answer:
You are not at sea level.
Explanation:
Assuming empirical observation shows boiling point 'below' 100°C then one concludes boiling experiment is being conducted above sea level where air pressure is lower than sea level air pressure. Generally, it is accepted in most literature publications that atmospheric pressure decreases ~1-inch per 1000-ft increase in elevation.
By definition, the boiling point of a liquid occurs when the atmospheric pressure equals fluid vapor pressure. Thus, if experimentally a water sample boils less than 100°C then one can only conclude the atmospheric pressure is lower than that needed to boil water at sea level atmospheric pressure; i.e., observed boiling point is at elevation greater than sea level.
One can calculate the boiling point of a liquid relative to sea level boiling point by using the Clausis-Clapeyron Equation.
ln(VP₂/VP₁) = ΔH(vap)/R(T₁ - T₂/T₁·T₂) solve for T₂ given Heat of Vaporization of water (ΔH(vap) = 28.2 Kj/mol) at specified temperature (T₁ at sea level = 273 Kelvin - standard) and R = 0.008314 Kj/mol-K).
In which food or drink are the particles most likely moving the fastest? Answers they gave to us: popsicle, cheese, a drink, Coffee. Please help me please i will give you a 5 star.
Answer:
Coffee
Explanation: When a liquid is warm the particles move faster
Over time the Mexican-Free Tailed bat has evolved to be able to echolocate in the dark to find prey. Bats are able to see, but do not have very good vision
and rely on echolocation
The bats have developed the skill of echolocation in response to a lack of which of the following abiotic factors?
O oxygen
O water
O plants
Olight
Pls Help I’ll give brainly
Answer:
Light
Explanation:
1 They were not albe to see at night because it was dark so the lack of light caused them to use echolocation.
Hope this helps
What is the differecn between Clo2 And Clo-2
Answer:
- ClO₂: it is chlorine dioxide.
- ClO₂⁻: it is the chlorite ion.
Explanation:
Hello!
In this case, since Cl stands for chlorine and O stands for oxygen, being the first compound an oxide and the second one an ion, we can reason:
- ClO₂: it is chlorine dioxide and as its name indicates it, it is an oxide with neutral charge, actually, a molecular compound formed by one chlorine atom and two oxygen atoms.
- ClO₂⁻: it is the chlorite ion in which chlorine has +3 as the oxidation state and therefore it is not neutral but negative as it is ready to bond with a positive ion (cation).
Best regards!
Which statement summarizes the law of superposition? A. The oldest rock is found in the bottom layer of a rock formation. B. The rarest elements are found in the lowest layer of a rock formation. O C. The densest layer of rock in a rock formation is the bottom layer. D. The top layer of rock in a rock formation is the oldest. SUBMIT e
Answer:
A superposition says that the newest rocks are nearer to the surface and oldest are near the bottom
Answer:
A.
Explanation:
Draw the structure of each of the following fatty acids, and give the structure its common name.
(a) $n$ -Dodecanate
(b) $c i s-\Delta^{9}$ -Hexadecenoate
(c) $c i s, c i s-\Delta^{9}, \Delta^{12}$ - Octadecadienoate
Answer:
Structure 1- dodecanoic acid (lauric acid)
Structure 2- hexadecanoic acid (palmitic acid)
Structure 3- octadecanoic acid (stearatic acid)
Explanation:
Fatty acids are carboxylic acids having long aliphatic chain. The chain may be either saturated or unsaturated. There are many naturally occurring fatty acids having unbranched chain of an even number of carbon atoms.
Usually, the common name of the fatty acid is not related to its systematic name. Its systematic name is obtained by IUPAC nomenclature.
The images shown are the skeletal structures of lauric acid, palmitic acid and stearic acid. I have written the names of the acids because the question specifically mentions that the compounds are fatty acids and not their salts.
The only naturally occurring isotopes of nitrogen are N-14 and N-15.
Based on the atomic mass of the element nitrogen on the Periodic Table, compare the relative abundances of the naturally occurring isotopes of nitrogen
Answer:
Isotope N–14 = 99%
Isotope N–15 = 1%
Explanation:
Let isotope A be N-14
Let isotope B be N-15
From the question given above, the following data were obtained:
For isotope A (N-14):
Mass of A = 14
Abundance of A = A%
For isotope B (N-15):
Mass of B = 15
Abundance of B = (100 – A%)%
Atomic mass of nitrogen = 14.01 amu
Thus, we can obtain the relative abundances of the naturally occurring isotopes of nitrogen as illustrated below:
Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]
14.01 = [(14 × A%)/100] + [(15 × (100 – A%)/100]
14.01 = 0.14A% + 0.15(100 – A%)
14.01 = 0.14A% + 15 – 0.15A%
Collect like terms
14.01 – 15 = 0.14A% – 0.15A%
– 0.99 = – 0.01A%
Divide both side by – 0.01
A% = – 0.99 / –0.01
A% = 99%
Abundance of B = (100 – A%)%
Abundance of B = (100 – 99)%
Abundance of B = 1%
Thus, the relative abundances of the naturally occurring isotopes of nitrogen are:
Isotope N–14 = 99%
Isotope N–15 = 1%
A rigid 7.80 L sealed vessel containing 2.700 mol of O2(g), 0.600 mol of C2H4(g), and 2.400 mol of Ne(g) has an internal temperature of 85.0∘C
a. Calculate the total pressure in the cylinder.
b. Find the mole fraction of O2 in the vessel.
c. A lab technician ignites the mixture in the vessel and the following reaction occurs:
C2H4(g)+3O2(g)→2CO2(g)+2H2O(g)
Find the mole fraction of each gas in the vessel after the reaction.
A. 21.47 atm
B. 0.4737 mol
C. 0.900moles of O2
1.200 moles of CO2
1.200 moles of H2O
2.400 mol of Ne that doesn't react.
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, the total pressure in the cylinder is 21.4atm. Ideal gas is a hypothetical gas.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Vanderwaal gas behave as ideal gas at low pressure and high temperature.
Mathematically,
PV=nRT
where,
P = pressure=?
V= volume=7.80 L
n =number of moles=2.700 mol +0.600 mol +2.400 mol
=5.7moles
T =temperature = 358 K
R = Gas constant = 0.0821 L.atm/K.mol
substituting all the given values in the above equation, we get
P × 7.80 L =5.7moles× 0.0821 L.atm/K.mol × 358 K
On calculations, we get
P =21.4atm
Therefore, the total pressure in the cylinder is 21.4atm.
To learn more about ideal gas equation, here:
https://brainly.com/question/14826347
#SPJ2
Why the value of kf is greater than kb?
Answer:
Kf being the depression of freezing point constant in the equation:
change in temperature = Kf * molality
Kb being the elevation of boiling point constant in the equation:
change in temperature = Kb * molality
the constant is variable for each solvent.
Explanation:
Thiols, sulfides and disulfides have high solubility in water. a. True b. False
Answer:
the answer is a true
Explanation:
Thiols, sulfides and disulfides have high solubility in water. This statement is true. Therefore, option A is correct.
What is solubility ?Solubility refers to a substance's ability to form a solution with another substance, the solvent. The inability of the solute to form such a solution is referred to as insolubility.
Temperature, pressure, polarity, and molecular size are all factors that influence solubility. For most solids dissolved in liquid water, solubility increases with temperature. This is due to increased vibration or kinetic energy of the solute molecules at higher temperatures.
A rise in temperature stresses the equilibrium condition, causing it to shift to the right. Because the dissolving process consumes some of the heat, the stress is reduced. As a result, as the temperature rises, so does the solubility.
Thus, option A is correct.
To learn more about solubility, follow the link;
https://brainly.com/question/8591226
#SPJ5
How does the particle motion and behavior affect how a substance appears on a macroscopic level use the term solid liquid gas state of matter and particle motion in your answer
Answer:Long-term drug abuse changes areas in the brain that affect behavior, judgment, learning and memory
Explanation:
1. True or false ? Balanced forces cause a change in motion. How do you know this ?
2. True or false ? Unbalanced forces cause a change in motion? How do you know this ?
Answer:
1. False
Balanced forces would mean all forces acting upon an object would be equal. So there is no movement.
2. True
Unbalanced forces would mean there is a force acting upon a side of tge object, causing it to move in a direction.
4. What is valency? Explain different types of
valencies
Answer:
Valency is the combining power of an element.
There are two types of valency - Electrovalency and Covalency.
Electrovalency: It is equal to the number of electrons lost or gained by atom to form ion.Covalency: It is the number of electron taking part in the formation of shared pairs.Hope it helps!<3
when do you say that a quanitity needs directions to complete its de
scription??
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because of the absence of options. However, it seeks to differentiate between a scalar and a vector quantity. A scalar quantity is a quantity with just magnitude but no direction (example is mass) while a vector quantity is a quantity with both magnitude and direction. Thus, a quantity needs direction to complete it's description when such quantities is a vector quantity such as weight (which is the downward force/gravity acting on an object with relative mass). The mass is the magnitude while the gravity/downward force is the direction. It would just be a scalar quantity if it had just mass and no downward force (as in direction) acting on it.
which of these chemical formula is an empirical formula: c2h4s or c2h4s2
Answer:
c2h4s
Explanation:
You can reduce s2 to s
Which type of mutation can contribute to the development of many types of cancers
Answer:
The answer to this question is given below in this explanation section.
Explanation:
"mutation can contribute to the development of many types of cancers"
About genetic mutations:
There are the two basic type of genetic mutations
Acquired mutations:
These are the most common cause of cancer.They occur from damage to genes in a particular cell during a personal life.For example this could be a breast cell or a colon cell, with the goes on to divide many times and form a tumor.A tumor is an abnormal mass. Cancer that occurs because of acquired mutations are not found in every cell in the body and they are not passed from parent to child.
Factors that causes these mutations include:
TobaccoUltraviolet radiationvirusesAgeGerm line mutations:
These are less common.A germ line mutations occurs in a sperm cell or egg cell.It passes directly from a parent to a child at the time of conception.As they embryo grows into a baby,the mutation from the initial sperm or egg cell is copied into every cell within the body.Because the mutation effects reproductive cells,it can pass generation to generation.Cancer caused by germ line mutations is called inherited cancer. it accounts for about 5% to 20% of all cancers.
Mutations and cancer:
A mutation may be harmful beneficial or neutral.This depends where in the gene the change occurs.Typically the body corrects most mutations.A single mutations will likely not cause cancer.
Types of genes like a cancer:
Many of the genes that contribute to cancer development fall into board categories.
Tumors suppressor genes:
These are protective genes. Normally they limit cell growth by:
Monitoring how quickly cell divide into new cellsRe-paring mismatched DNAControlling when a cell diesHELP PLEASE I NEED HELPPPPPPPPPPPPPPPPPPPPPPPPP
Answer:
B.
Explanation:
If it's coming from the south and pushing it north then it'll speed up the marble
Cl2 + 2Na → 2NaCl How many grams of NaCl are produced by the reaction of 0.300 L of chlorine gas at STP with excess sodium?
Answer:
1.52 g of NaCl
Explanation:
We'll begin by calculating the number of mole of chlorine gas (Cl₂) that occupied 0.3 L at STP. This can be obtained as follow:
Recall: 1 mole of any gas occupy 22.4 L at STP.
1 mole of Cl₂ occupy 22.4 L at STP.
Therefore, Xmol of Cl₂ will occupy 0.3 L at STP i.e
Xmol of Cl₂ = 0.3 / 22.4
Xmol of Cl₂ = 0.013 mole
Thus, 0.013 mole of Cl₂ occupied 0.3 L at STP.
Next, we shall determine the number of mole of NaCl produced from the reaction.
Cl₂ + 2Na —> 2NaCl
From the balanced equation above,
1 mole of Cl₂ reacted to produce 2 moles of NaCl.
Therefore, 0.013 mole of Cl₂ will react to produce = 0.013 × 2 = 0.026 mole of NaCl.
Thus, 0.026 mole of NaCl is produced.
Finally, we shall determine the mass of the NaCl. This can be obtained as follow:
Mole of NaCl = 0.026 mol
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl =?
Mole = mass /Molar mass
0.026 = mass of NaCl / 58.5
Cross multiply
Mass of NaCl = 0.026 × 58.5
Mass of NaCl = 1.52 g
Therefore, 1.52 g of NaCl were produced from the reaction
7.
Which characteristic is comaon of developing countries?
A
B
C
D.
Slower growth rate
longer life expectancy
lower fertility rate
higher infant mortality
Slower growth rate is common characteristic of developing countries. Therefore, the correct option is option A.
What is developing countries?A sovereign state that is considered to be developing has a less developed industrial base with an HDI that is lower than other nations. This term is not generally accepted, though. Furthermore, there is no consensus on which nations fall into this category.
Although the phrase "low and middle-income country" (LMIC) is sometimes used synonymously, it only relates to the economies of the nations. In accordance with gross national income per capita, the World Bank divides the world's economy into four categories: high, upper-middle, lower-middle, as well as low income countries. Slower growth rate is common characteristic of developing countries.
Therefore, the correct option is option A.
To know more about developing countries, here:
https://brainly.com/question/28741145
#SPJ2
What happens when Magnesium hydroxide is heated? (Decomposition)
Answer:
It will make magnesium oxide and water
Explanation:
What else is produced during the combustion of propane, C3H8?
H2O ,
C3H8,
O2,
or
C3H8O2?
Answer:
H20
Explanation:
Answer:
The answer is H20
Explanation: