Answer:
organs is the right answer
Explanation:
An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. Many organs working together to accomplish a common purpose is called an organ system.
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Which of the following is the net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid? (A) NaF (aq) + HCI (aq) → Naci (aq) + HF (aq) (B) Na+ (aq) + F- (aq) + H+ (aq) + CI+ (aq) → Na+ (aq) + Cl - (aq) + HF (aq) (C) Na+ (aq) + CI+ (aq) → NaCl (aq) (D) F- (aq) + H+ (aq) → HF (aq)
The net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid is B. Na+ (aq) + F- (aq) + H+ (aq) + Cl- (aq) → Na+ (aq) + Cl- (aq) + HF (aq)
This is the net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid. The balanced equation for this reaction is NaF (aq) + HCl (aq) → NaCl (aq) +HF (aq).
The net ionic equation is derived by canceling out the spectator ions, which are ions that don't participate in the chemical reaction. In this case, Na+ and Cl- are spectator ions, which means that they don't participate in the reaction and are present in the same form on both sides of the equation. Therefore, they are cancelled out, leaving the net ionic equation Na+ (aq) + F- (aq) + H+ (aq) + Cl- (aq) → Na+ (aq) + Cl- (aq) + HF (aq).
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Which one of the following statements is not correct about MSDS?
Select one:
a.
It does not contain information on physical and chemical properties of the material, potential hazards of the material and how to work safely with these materials.
b.
It provides single reference for all information about hazardous chemicals.
c.
Material Safety Data sheet forms the important elements of effective Chemical Hazards Communication System.
d.
It is a document prepared by the manufacturers/suppliers of the chemical
Option B. It provides a single reference for all information about hazardous chemicals.
MSDS does not provide a single reference for all information about hazardous chemicals, but it does provide information on physical and chemical properties, potential hazards, and safe work practices.
Understanding the Role of MSDS in Chemical Hazard CommunicationThe Material Safety Data Sheet (MSDS) is a document prepared by the manufacturer or supplier of a hazardous chemical which provides information about the physical and chemical properties of the hazardous chemical, potential hazards associated with it, and how to work safely with it. The MSDS is an important element of an effective chemical hazard communication system as it provides information on how to identify and protect against potential health hazards, proper storage and handling procedures, and proper disposal methods.
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How much heat energy is obtained when 1 kg of ethane gas, C2H6, is burned in oxygen according to the equation: 2C2H6(g)+7O2(g)→4CO2(g)+6H2O(l)ΔHm=–3120 kJ(3.8.3)
Answer:
52,000 kJ
Explanation:
The combustion reaction is the following:
2 C₂H₆(g) + 7 O₂(g) → 4CO₂(g) + 6H₂O(l) ΔHm= –3120 kJ
From the chemical reaction and the value of ΔH we can see that 2 moles of ethane gas (C₂H₆(g)) release 3120 kJ of heat energy. So, we have the conversion factor: 3120 kJ/2 moles C₂H₆.
To calculate how many kJ are released from the combustion of 1 kg of ethane, we have to first convert the mass to moles by using the molecular weight (MW) of ethane (C₂H₆):
MW(C₂H₆) = (12 g/mol x 2 C) + (1 g/mol x 6 H) = 30 g/mol
mass = 1 kg x 1000 g/1 kg = 1000 g
moles of C₂H₆= mass/MW = 1000 g/(30 g/mol) = 33.3 mol C₂H₆
Finally, we multiply the conversion factor by the number of moles of C₂H₆ in 1 kg:
heat energy released = 33.3 mol C₂H₆ x 3120 kJ/2 moles C₂H₆ = 52,000 kJ
Therefore, 51,000 kJ are released when 1 kg of ethane is burned.
A container holds two gases at standard pressure. If the first gas exerts 359.42 mm
Hg, how much pressure does the second gas exert?
Answer:
400.58
Explanation:
Standard pressure is 1atm/760 mm Hg
760-359.42= 400.58
The broad bands or regions located around the nucleus where the electrons are found are called energy rings.
True
False
It is false that the broad bands or regions located around the nucleus where the electrons are found are called energy rings.
The nucleus is the centre of an atom. Protons and neutrons are particles that make up the nucleus. Shells of electrons rotate around the nucleus. The atom is made up of a small nucleus surrounded by electrons that move. The nucleus includes protons, with a positive charge equivalent to the negative charge of an electron. Neutrons, which have almost the same mass but still no charge as protons, may also be found in the nucleus.
The nuclear powerful force extends long enough from each baryon to bind protons and neutrons together while repelling the repelling electrical force between positively charged protons. The nuclear force acting has a relatively narrow range and practically vanishes just beyond the nucleus's border.
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What is measuring tools for sewing?
Measuring tools like Clear ruler, yardstick, measuring tape etc. They are very useful for the perfect fit and shape of any garment and even home furnishing.
Sewing is the craft of fastening or attaching objects using stitches which is made up of a sewing needle and thread.
Measuring tools are the instruments used by practitioners and researches to aid in the assessment or evaluation of the subjects, clients or patients etc. These instruments are used to measure or collect the data on a variety of variables ranging from psychosocial wellbeing or physical functioning.
Measuring tools in sewing are as follows: Measuring tape, clear ruler, quilting ruler, yardstick, French curve etc.
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What process makes 2 ATP?
Anaerobic respiration results in the production of 2 ATP molecules.
What is anaerobic respiration?Anaerobic respiration is the use of electron acceptors other than molecular oxygen in respiration. Despite the fact that oxygen is not the ultimate electron acceptor, the process employs a respiratory electron transport chain. When there is insufficient oxygen for some species to respire, they still require energy to survive. Due to a lack of oxygen, they respire in the absence of oxygen to create the energy they require, which is known as anaerobic respiration. While most aerobic respiration (with oxygen) occurs in the cell's mitochondria, anaerobic respiration (without oxygen) occurs in the cytoplasm.
Here,
Two ATP molecules are created during anaerobic respiration.
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Which of the following elements are metals?
A.
fluorine (F) and argon (Ar)
B.
iodine (I) and carbon (C)
C.
oxygen (O) and selenium (Se)
D.
potassium (K) and chromium (Cr)
Answer:
its D. potassium and chromium
Answer:
option d
Explanation:
potassium and chromium
5L of air at-50 C is warmed to 100 C. What is the new volume?
Answer:
V2 = 5.8 L
Explanation:
T1 = 50°C = 323 K
V1 = 5L
T2 = 100°C = 373 K
V2 =?
According to Charles's law,
V1/T1 = V2/T2
---> V2 = (T2/T1)V1 = (373K/323K)(5 L)
= 5.8 L
Which of the following elements can be prepared by electrolysis of their aqueous salts: O copper O fluorine O silver O nitrate O potassium O calcium O iodine
O copper of the following elements can be prepared by electrolysis of their aqueous salts
What are the byproducts of aqueous solution electrolysis?H+ ions are drawn to the cathode during the electrolysis of water, where they pick up electrons to create hydrogen gas. The oxygen gas is formed when OH-ions are drawn to the anode and lose their electrons.
What three byproducts of electrolysis are there?Sodium chloride solution electrolysis is a significant industrial process. Chlorine gas is created at the positive electrode; hydrogen gas is created at the negative electrode; and an alkali is left in the solution as three valuable chemicals.
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What is the volume of 1.8 × 106 molecules He?
Answer:
Volume = 190.8
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1. Calculate the pressure exerted by a 200 lb man wearing size 10 shoes, if the area of each shoe in contact with the floor is 20 square inches
The pressure exerted by a 200 lb man wearing size 10 shoes, if the area of each shoe in contact with the floor is 20 square inches is about 5.77 Pa.
What is pressure ?Pressure is the force exerted by unit area. Hence, as the force applied increases, pressure increases.
To calculate the pressure exerted by the man, we need to use the formula:
Pressure = Force / Area
where the force is the weight of the man, and the area is the total area of both shoes in contact with the floor.
First, we need to convert the weight of the man from pounds (lb) to Newtons (N), since the SI unit of force is the Newton. We can do this using the conversion factor:
1 lb = 4.44822 N
So, the weight of the man in Newtons is:
200 lb x (4.44822 N/lb) = 896.44 N
Next, we need to calculate the total area of both shoes in contact with the floor. Since the man is wearing size 10 shoes, we can estimate the area of each shoe to be:
Area per shoe = πr^2 = π(5 in)^2 = 78.54 in^2
So, the total area of both shoes in contact with the floor is:
Total area = 2 x 78.54 in² = 157.08 in²
Now we can calculate the pressure exerted by the man:
Pressure = Force / Area = 896.44 N / 157.08 in²
We need to convert the units of area from square inches (in²) to square meters (m²), since the SI unit of pressure is the Pascal (Pa) and 1 Pa = 1 N/m²:
Pressure = (896.44 N / 157.08 in^2) x (1 m^2 / 1550 in^2) = 5.77 Pa
Therefore, the pressure exerted by the man is approximately 5.77 Pa.
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Write the balanced chemical equation that represents the addition of CL2 to CH3CH=CH2.
The balanced chemical equation that represents addition of CL2 to CH3CH=CH2 is : CH3CH=CH2 = CL2 > CH3CHClCH2Cl.
What is meant by balanced chemical equation?Balanced chemical equations have the same number and type of each atom on both the sides of an equation. Coefficients in a balanced equation has to be the simplest whole number ratio and mass is always conserved in chemical reactions.
Balanced equation is an equation for a chemical reaction where the number of atoms for each element in the reaction and total charge is same for both the reactants and products. In other words, we can say that mass and the charge are balanced on both sides of a reaction.
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How many moles are in aspartame?
The quantity of atoms or molecules per gram of atomic weight is known as aspartame number, which is 6.022 1023/mole.
A dipeptide made up of the amino acids phenylalanine and aspartic acid is called aspartame and is its methylester. People with phenylketonuria, who must carefully limit their intake of phenylalanine, must be made aware of the ingredient's existence in the medicinal product and the quantity present in each dose unit. In turn, 10 g of aspartame contains 0.034 moles of molecules. How many nitrogen atoms make up 1.2 grams of aspartame? Due to aspartame's 294.347 g/mol molar mass, 1.2 g is equal to 1.2 g / 294 g/mol, or 0.0041 moles. Aspartame is digested in the body, unlike certain other potent sweeteners, and as a result.
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Calcular las fracciones molares de los componentes de una disolución formada por: 250 g de agua, 50 g de ácido acético y 25 g de cloruro de sodio.
The question is: Calculate the molar fractions of the components of a solution made up of: 250 g of water, 50 g of acetic acid and 25 g of sodium chloride.
Answer: The mole fraction of water, acetic acid and sodium chloride is 0.916, 0.054, and 0.028.
Explanation:
As number of moles is the mass of substance divided by its molar mass.
Therefore, moles of given species are calculated as follows.
The number of moles of water (molar mass = 18 g/mol):
[tex]Moles = \frac{mass}{molar mass}\\= \frac{250 g}{18 g/mol}\\= 13.88 mol[/tex]
The number of moles of acetic acid (molar mass = 60.052 g/mol):
[tex]Moles = \frac{mass}{molar mass}\\= \frac{50 g}{60.052 g/mol}\\= 0.832 mol[/tex]
The number of moles of sodium chloride (molar mass = 58.44 g/mol):
[tex]Moles = \frac{mass}{molar mass}\\= \frac{25 g}{58.44 g/mol}\\= 0.427 mol[/tex]
Therefore, mole fraction of each component is calculated as follows.
Mole fraction of water:
[tex]Mole fraction = \frac{moles of water}{Total moles}\\= \frac{13.88}{13.88 + 0.832 + 0.427}\\= \frac{13.88}{15.139}\\= 0.916[/tex]
Mole fraction of acetic acid:
[tex]Mole fraction = \frac{moles of water}{Total moles}\\= \frac{0.832}{13.88 + 0.832 + 0.427}\\= \frac{0.832}{15.139}\\= 0.054[/tex]
Mole fraction of NaCl:
[tex]Mole fraction = \frac{moles of water}{Total moles}\\= \frac{0.427}{13.88 + 0.832 + 0.427}\\= \frac{0.427}{15.139}\\= 0.028[/tex]
Thus, we can conclude that mole fraction of water, acetic acid and sodium chloride is 0.916, 0.054, and 0.028.
Warm air rises because:
A.) It is made of helium
B.) As it warms the particles spread out making it less dense
C.) As it warms the particles get closer together making it more dense
D.) Air always moves towards the sun or moon due to gravity
As the air gets warmer it rises because, particles spread out making it less dense. The diffusing capability of gas molecules make it possible.
What is intermolecular forces ?Intermolecular force are the force that keep the particles of a substance binded together. Gaseous molecule easily diffuse in air , since the intermolecular attraction is very less in them.
In solid state molecules are densely packed and difficult to move apart. In liquid state , particles have some space to move and in gases molecules are far apart due to less intermolecular force.
As the gas molecules in air absorbs heat energy, they overcome all the intermolecular forces and will spread out in the air. Thus, they rises above over a temperature gradient.
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Which of the following require(s) resonance structures to more accurately represent their electron arrangements
The correct representation about resonance structures is that The structure of the species cannot be correctly predicted by a single resonance structure and the only way resonance structures vary is in the way the electrons are arranged.
In valence bond theory, resonance is defined as a hybrid structure formed by combining a variety of contributing structure into a resonance hybrid. Because orbitals overlap, resonance happens. Pi bonds, created when two 2p orbitals overlap, are the building blocks of double bonds. These pi orbitals' electrons are delocalized since they will be dispersed across more than two atoms.
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what one plus one
is it two three four five
Answer:
Two, I'd say, unless there's some trick to what you're asking! :)
Explanation:
Answer:
eleven
Explanation:
combine numbers together
1 + 1
1 + 1
1 + 1
1+1
11
--------------------------------------------------------
just kidding LOL
answer is 2
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Calculate the number of grams in 0.586 mole of each of the following substances?
a) Water, H2O.
= ___ g H2O
b) Glucose, C6H12O6, a sugar in grape juice and honey.
= ____ g C6H12O6
c) Methane, CH4.
= ____ g CH4
Answer:
Explanation:
H2O: 18.015 g/mol
0.586 mol H2O x 18.015 g/mol H2O x 1 mol H20 = 10.557 g H20
C6H12O6: 180.156 g/mol
0.586 mol C6H12O6 x 180.156 g/mol C6H12O6 x 1 mol = 105.571 g C6H12O6
CH4: 16.043 g/mol
0.586 mol CH4 x 16.043 g/mol x 1 mol CH4 = 9.401 g CH4
How many protons are neutral in nitrogen?
A neutral atom of Nitrogen will have seven protons.
The symbol given for Nitrogen is N, the atomic number 7. Atomic number is equivalent to the number of protons in an atom. So, for Nitrogen, the number of protons is 7.
What is a neutral atom?A neutral atom is an atom which consists of the same number of protons and the same number of electrons. Neutral atoms will have the equal number of protons in the nucleus as they have electrons orbiting the nucleus.
In a neutral atom, the total charge on the atom is zero. Atom has same number of protons and electrons in it. For example, neutral atom of Sodium, with atomic number 11, has 11 protons and 11 electrons in its neutral state.
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2H₂(g) + O2(g) → 2H₂O(g)
How many liters of H₂ are required to form 5 moles of H₂O at STP?
Answer:
The answer is 21.5 L
Explanation:
What are the units of density
Answer:
Kg/ ml
Explanation:
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thank you
The specific heat of water is 4.186 J/g°C. A sample of 40. g H subscript 2 O is at an initial temperature of 91.0 °C. If the sample of water released a total of 1,300 joules, what is the approximate final temperature of the water?
a. 74 °C
b. 87 °C
c. 81 °C
d. 83 °C
Earth’s atmosphere is a mixture of gases. Which gas makes up almost 80% of the atmosphere by volume?
A.
oxygen
B.
nitrogen
C.
carbon dioxide
D.
water vapor
How many moles of O2 are required to burn 1.65 mol of C4H10? C4H10+O2→CO2+H2O
What are the coefficients needed to balance this chemical reaction to show that matter is conserved?
Fe + Cl2 → FeCl3
A
1, 1, 1
B
2, 3, 2
C
3, 2, 2
D
4, 2, 2
Answer:
b
the balanced is 2fe+3cl2=2fecl3
The coefficient that are required to balance the chemical reaction should be [tex]2fe+3cl2=2fecl3[/tex]
What is the chemical reaction?It is the process where it contain one or more substance known as the reactant. And, are converted into one or more different substance called as the products. It could be in the form of chemical elements or compounds.
Hence, we can conclude that The coefficient that are required to balance the chemical reaction should be [tex]2fe+3cl2=2fecl3[/tex]
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H2O2 → H2O+ ½ O2
Hydrogen peroxide decomposes to produce water and oxygen according to the equation above. An experimentally determined graph for the first-order decomposition of hydrogen peroxide is provided below.
Which of the following best identifies the rate constant k for the reaction based on the information in the plot of ln[H2O2] versus time (t)?
O k = ln[H2O2] at t = 0s
O k = ln[H2O2] at t = 500s
O k = −(slope of plot)
O k = −1/(slope of plot)
k = -1/(slope of plot) is the correct answer to identify the rate constant k for the reaction based on the information in the plot of ln[H2O2] versus time (t).
The equation for the first-order decomposition of hydrogen peroxide is H2O2 → H2O+ ½ O2The graph provided is a plot of ln[H2O2] versus time (t)The rate constant (k) is a measure of how fast a reaction occursIn the context of first-order reactions, the rate constant is related to the slope of a plot of ln[H2O2] versus time (t)Therefore, the rate constant can be determined by finding the slope of the plot and then using the formula k = -1/(slope of plot)
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Which element will produce a new compound when added to a beaker containing an aqueous solution of copper (II) sulfate ()
A) Sodium is the element that will produce a new compound when added to a beaker containing an aqueous solution of copper (II) sulfate ().
When sodium is added to an aqueous solution of copper (II) sulfate, a new compound is formed.
This reaction is known as a displacement reaction and occurs when the sodium ions take the place of the copper ions in the solution.
As the sodium ions bond with the sulfate ions, they form sodium sulfate and free copper ions, which can then be extracted from the solution. This reaction is a great example of how chemical reactions can produce new compounds and materials.
This chemical reaction illustrates how certain substances can interact to create new substances with different properties.
Although a part of your question is missing, you might be referring to this question:
Which element will produce a new compound when added to a beaker containing an aqueous solution of copper (II) sulfate ()?
a) Sodium
b) Berrylium
c) Manganese
d) none of the above
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what product is obtained when an acid reacts with a metal?
Answer:
salt and hydrogen gas
Explanation:
acid + metal = salt + hydrogen
Answer:
hope this helps
Explanation:
hydrogen gas
An acid will react with a metal to form a salt and hydrogen gas. The general word equation for the reaction between an acid and a metal is as follows: acid + metal → salt + hydrogen.
help help help help help help
Answer:
your answer is B, your graph is constant from there, therefore the pattern is uniform (orderely).