Name of Pb(NO3 )2 is Lead(II) nitrate.
Pb(NO3)2 is ionic as well as covalent
Pb is the symbol of lead and NO3 is a complex ion called nitrate. It has one nitrogen and three oxygens. Pb(NO3)2 is ionic as well as covalent. NO3 is covalent in nature because both nitrogen and oxygen are non-metals and therefore an ionic bond cannot be formed between them.
Ionic compounds are formed when a metal reacts with a nonmetal whereas covalent compounds are formed when two non -metals react with each other. Binary compounds containing hydrogen are usually covalent compounds as hydrogen is a non - metal.
An ionic bond donates an electron to the other atom in the bond whereas electrons in a covalent bond are shared equally between the atoms.
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7. Using Ideal Gas Law, calculate the total volume of a balloon that contains 2.00 moles of a gas
mixture at STP (0 °C and 1 atm)?
The total volume of a balloon that contains 2.00 moles of a gas mixture at STP is 44.8 L
It is given that
moles of gas = 2 moles
pressure of gas = 1 atm
temperature of gas = 0 °C = 273 K
According to ideal gas equation
PV = nRT
where P is the pressure, v is the volume, n is number of moles of gases, R is universal gas constant which has a value of R = 0.0820574 L•atm•mol-1K and T is the temperature
1 atm x V = 2 x 0.0820574 x 273
V = 44.8 L
Hence, total volume of a balloon is
44.8 L
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please help asap (i just need B)
The final pressure of the reaction is found to be 49.81 torr and the half life of the decomposition of dimethyl ether is 1019.11 seconds.
The decomposition of dimethyl ether at 540 degrees Celsius is a first order reaction,
The relation between the initial pressure and final pressure in the first order reaction is,
-Kt = ln[P]/[Pₙ]
Where,
K is the rate constant,
P is the final pressure,
Pₙ is the final pressure,
t is the time period.
(a) the initial pressure is 135 torr, the rate constant K is 6.8 x 10⁻⁴ s⁻¹, time period is 1420 seconds,
Putting all the values in the formula,
-Kt = ln[P]/[Pₙ]
6.8 x 10⁻⁴ x 1420 = ln[135]/[Pₙ]
0.9656 = ln[135]/[Pₙ]
Here, 0.9656 ≈ 1, and e = 2.71
e¹ = 135/Pₙ
Pₙ = 135/2.17
Pₙ = 49.81 torr.
(b) The half life of a first order reaction is given by,
T = 0.693/K
Where,
T is the half life,
K is the rate constant,
Putting the values
T = 0.693/ 6.8 x 10⁻⁴
T = 1019.11 seconds.
So, half life is 1019.11 seconds.
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Identify the equipment best suited for extinguishing each type of fire.
a. small benchtop fire
b. clothing fire
c. large fire on floor
1. fire extinguisher
2. fire extinguisher
3. fire blanket
The extinguisher equipment best suited for extinguishing each type of fire is given below.
Small benchtop fire: Overturned beaker
Large fire on the floor: Fire extinguisher
Clothing fire: Fire blanket
Fire extinguishers are equipment that is generally used to put out fires in emergency situations.
In a fire extinguisher container, a liquified version of carbon dioxide gas is used to extinguish the fire.
For extinguishing fire in a small benchtop fire, the kind of fire extinguisher that is used is called overturned beaker.
Similarly, if a cloth catches fire, then putting a blanket on it or wrapping it around it can extinguish the fire. The reason being a blanket is a thick piece of cloth and does not allow air to pass through it quickly, Thus, it can be quite helpful in times of emergency.
On the other, if a large area catches fire, then a fire extinguisher must be used as it contains liquid carbon dioxide that excludes the oxygen from that area and keeps the fire under control.
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A chemical reaction is necessary to separate the parts of a homogeneous
mixture.
true or false?
A mixture is made up of two or more different substances. A mixture can contain solids, liquids and/or gases. The components in a mixture are not chemically joined; they are just mixed. That means we do not need to use chemical reactions to separate them.
The product side of a chemical reaction is shown.
→ 7Ti2(SO4)3
Which number represents a coefficient?
The number that represents the coefficient on the product side of the chemical reaction, [tex]-- > 7Ti_2(SO_4)_3[/tex] is 7.
Coefficients of chemical equationsIn equations representing chemical reactions, the coefficient of each reactant or product of a reaction is the number that comes on the left-hand side just before the chemical formula.
The coefficient of each species in a chemical reaction is obtainable when the equation of the reaction is balanced.
For example, in the following equation: 2A + B = 3C + D
The coefficients of A, B, C, and D are 2, 1, 3, and 1 respectively.
Applying this to the product side of a chemical reaction; [tex]-- > 7Ti_2(SO_4)_3[/tex]
It means that the coefficient of the product is 7.
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As a sample of lodine-131 decays, its half-life
1) increases
2) decreases
3) remains the same I
Answer:
As a sample of lodine-131 decays, its half-life
3) remains the same
the majority of the volume of the atom is located in the
The nucleus is the atom's central core and contains more than 99.9 percent of its mass. Surrounding the nucleus is a cloud of electrons, which makes up most of the atom's volume.
Which chemical property of alkanes is responsible for generating electricity in diesel
power stations or for moving motor vehicles?
According to the Chemical property of Alkanes, It is relatively unreactive which is responsible for generating electricity in diesel.
Alkanes do not react with strong acids, bases, oxidizing, or reducing agents (reductants). Alkanes combust (react quickly with oxygen), releasing energy, and making them useful as fuels.
Alkanes are saturated hydrocarbons that burn easily in the air with a blue non-sooty flame, releasing a large amount of heat and light energy. This heat energy can be used to heat water, cook food, and power machines in factories and thermal power plants. That is why they are such good fuels.
Methane, ethane, propane, and butane are all gases that can be burned directly as fuel.
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Which sentence best describes the concept of Redshift?
Answer:
'Red shift' is a key concept for astronomers. The term can be understood literally - the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum.
Something similar happens to sound waves when a source of sound moves relative to an observer. This effect is called the 'Doppler effect' after Christian Andreas Doppler, an Austrian mathematician who discovered that the frequency of sound waves changes if the source of sound and the observer are moving relative to each other.
If the two are approaching, then the frequency heard by the observer is higher; if they move away from each other, the frequency heard is lower.
There are many everyday examples of the Doppler effect - the changing pitch of police and ambulance sirens, or train whistles and racing car engines as they pass by. In every case, there is an audible change in pitch as the source approaches and then passes an observer.
Everyone has heard the increased pitch of an approaching police siren and the sharp decrease in pitch as the siren passes by and recedes. The effect arises because the sound waves arrive at the listener's ear closer together as the source approaches, and further apart as it recedes.
Light behaves like a wave, so light from a luminous object undergoes a Doppler-like shift if the source is moving relative to us. Ever since 1929, when Edwin Hubble discovered that the Universe is expanding, we have known that most other galaxies are moving away from us. Light from these galaxies is shifted to longer (and this means redder) wavelengths - in other words, it is 'red-shifted'.
Since light travels at such a great speed relative to everyday phenomena (a million times faster than sound) we do not experience this red shift in our daily lives.
The red shift of a distant galaxy or quasar is easily measured by comparing its spectrum with a reference laboratory spectrum. Atomic emission and absorption lines occur at well-known wavelengths. By measuring the location of these lines in astronomical spectra, astronomers can determine the red shift of the receding sources.
However, to be accurate, the red shifts observed in distant objects are not exactly due to the Doppler phenomenon, but are rather a result of the expansion of the Universe.
Doppler shifts arise from the relative motion of source and observer through space, whereas astronomical redshifts are 'expansion redshifts' due to the expansion of space itself.
Two objects can actually be stationary in space and still experience a red shift if the intervening space itself is expanding.
A convenient analogy for the expansion of the Universe is a loaf of unbaked raisin bread. The raisins are at rest relative to one another in the dough before it is placed in the oven. As the bread rises, it also expands, making the space between the raisins increase.
If the raisins could see, they would observe that all the other raisins were moving away from them although they themselves were stationary within the loaf. Only the dough - their 'Universe' - is expanding.
What volume of a 1. 00 m stock solution of glucose must be used to make 500. 0 ml of a 1. 75×10−2 m glucose solution in water?.
The volume of Solution of glucose is 8.75 ml.
According to dilution law:
[tex]M_{1} V_{1} = M_{2} V_{2}[/tex]
where,
[tex]M_{1}[/tex] = molarity of stock solution = 1.00 M
[tex]V_{1}[/tex] = volume of stock solution =?
[tex]M_{2}[/tex] = molarity of glucose solution = 1.75×10−2
[tex]M_{2}[/tex] = volume of glucose solution = 500 ml
Applying all the given values to the above law gives the volume of the stock solution:
(1.00M) x [tex]V_{1}[/tex] = ( 1. 75×[tex]10^{2}[/tex]M) x (500ml)
[tex]V_{1}[/tex] = 8.75 ml
The volume of the 1.00 M stock solution is 8.75 mL of the required volume.
To determine the amount of stock solution required divide the number of moles of glucose by the molarity of the stock solution. A 1 M glucose stock solution can be prepared by dissolving 18 g of glucose in distilled/deionized water to a final volume of 100 ml. The total mass of a solution is the mass of the solvent plus the mass of the solute. Weigh the mass using a laboratory balance or convert the solvent volume to mass using the density formula D = m/V. Add the mass of the solute to the mass of the solvent to get the final volume.
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Carter is planning a backpacking trip in the mountains. To prepare for the trip, he has purchased the gear he needs and is planning his meals. He knows it will be cold in the evenings, and he would like a warm meal. Although it will cost more than using a camp stove to heat purified water from the trail and prepare dehydrated food, Carter is considering the use of self-heating containers. He evaluates containers that use the heating systems given in the table. Identify two potential constraints for the system Carter may choose, one based on the specific needs of the situation and one considering environmental impacts or costs. Develop criteria based on scientific understanding of energy transfer that can be used to evaluate potential solutions for his choice in system. Analyze the costs and benefits of using self-heating containers compared with using a camp stove.
Learn sensible suggestions for making plans and organizing a backpacking trip, The surroundings or situations in which an organism life is referred to as the environment.
The environment can be defined as a sum general of all of the dwelling and non-living factors and their consequences that affect human lifestyles. while all residing or biotic factors are animals, flora, forests, fisheries, and birds, non-living or abiotic elements include water, land, daylight, rocks, and air.
Environment is the whole lot that is round us. it may be living or nonliving things. It includes physical, chemical and different herbal forces. dwelling things stay in their surroundings.
All of the physical surroundings on earth are known as the environment. The surroundings include the whole lot residing and the whole thing nonliving. The nonliving part of the surroundings has 3 essential elements the ecosystem, the hydrosphere, and the lithosphere.
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Which of the following equations represents the law of conservation of mass?
A-2H + 2O -->2H2O
B-2H2O -->2H2 + O2
C-H2O -->H2 + O2
D-H2 + O2 -->H2O + H2O2
Equations represents the law of conservation of mass is 2H₂O → 2H₂ + O₂
Law of conservation of mass stated that energy neither be created nor destroyed called as law of conservation of mass and as the same no of each atom present in the both side of the reaction this reaction represents the law of conservation of mass so in the equation 2H₂O → 2H₂ + O₂ the energy cannot be created nor destroyed water can form 2 mole of hydrogen and 1 mole of oxygen which form water
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write the balanced net ionic equation for the reaction when agc₂h₃o₂ and ni(clo₄)₂ are mixed in aqueous solution. if no reaction occurs, simply write only nr. be sure to include the proper phases for all species within the reaction.
From the question, we would have the balanced ionic equation as; 2Ag^+(aq) + (ClO₄)₂^-(aq) -------> 2Ag(ClO₄)₂ (s)
What is a balanced reaction equation?We know that a reaction equation is said to be balanced when the number of atoms of the elements on the reactants side is equal to the number of atoms of the same element on the products side. This is achieved by the process that we call an atom count. After we add the necessary stoichiometric coefficients that we think would help us to be able to obtain the number of atoms that could be used to balance the equation as shown.
In this case, we are required to write the balanced reaction equation for the reaction when AgC₂H₃o₂ and Ni(ClO₄)₂ are mixed in aqueous solution.
We would then have in this case;
2AgC₂H₃o₂ (aq) + Ni(ClO₄)₂ (aq) -------> 2Ag(ClO₄)₂ (s)+ Ni(C₂H₃o₂)2 (aq)
Net ionic equation is;
2Ag^+(aq) + (ClO₄)₂^-(aq) -------> 2Ag(ClO₄)₂ (s)
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the first step in the preparation of magnesium metal is the precipitation of mg(oh)2 from sea water by the addition of ca(oh)2. the concentration of mg2 (aq) in sea water is 5.37 × 10–2 m. calculate the ph at which [mg2 ] is decreased to 1.0 × 10–5 m
The first step in the preparation of magnesium metal is the precipitation of Mg(OH)₂ from sea water by the addition of Ca(OH)₂ the concentration of Mg₂ (aq) in sea water is 5.37 × 10⁻² m then ph at which [Mg₂ ] is decreased to 1.0 × 10⁻⁵ m is 1.27
Magnesium is the element and also one of the alkaline earth metal and metallic magnesium is prepared either by electrolysis of molten MgCl₂ or by metallothermic reduction of its halides by alkali or alkaline-earth metals
Here given data is concentration = 5.37 × 10⁻² m
We have to find pH= ?
pH = -log[HA]
pH = -log[Mg₂]
pH = -log[5.37 × 10⁻² m]
pH = 1.27
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Calculate AH°rxn from AH°7 values (use table in textbook appendix) a) Cl2 (g) + 2 Na (s) -› 2 NaCl (s) EITHER -411.1kJ/mol b) 2 H2S (g) + 3 02 (g) -> 2 SO2 (g) + 2 H20 (g)
To find AH°rxn, we use the following equation:
What we're going to do is to sum the enthalpy of the products and then substract with the enthalpy of the reactives:
As you can see, we need to multiply by the coefficients of the reaction.
Now, just replace the values of the table:
So the answer is -822.2kJ/mol.
For b:
Now, just replace the values of the table:
The answer for b is -1036kJ/mol.
1-80 in Og CARBONATED WATER, HIGH FRUCTOSE CORN SYRUP AND LESS THAN 2% OF: GINGER EXTRACT, NATURAL FLAVORS, CITRIC ACID, SODIUM BENZOATE (PRESERVATIVE), CARAMEL COLOR. PRODUCED UNDER THE AUTHORITY OF DR PEPPER/SEVEN UP, INC., 5301 LEGACY DRIVE, PLANO, TX 75024. TM&2019 DR PEPPER/SEVEN UP, INC.
Water that has dissolved carbon dioxide gas in it is referred to as carbonated water. This gas can be added to water intentionally under pressure or naturally through geological processes. The water becomes fizzy due to the formation of tiny bubbles from carbonation.
A sweetener manufactured from maize starch, high-fructose corn syrup is sometimes referred to as glucose-fructose, iso-glucose, and glucose-fructose syrup. Similar to how regular corn syrup is made, enzymes convert the starch in the starch into glucose.
To help prevent or treat nausea and vomiting caused by motion sickness, pregnancy, and cancer chemotherapy, health care professionals may now use ginger. It may possibly be used to treat cardiac problems. It is also used to alleviate moderate stomach upset and to lessen osteoarthritis pain.
Organic compound HOC(CH2CO2H)2 is the formula for citric acid. Citrus fruits naturally contain it. It is a biochemical intermediary in the citric acid cycle, which is a component of all aerobic organisms' metabolism.
The sodium counterpart of benzoic acid, sodium benzoate, is a common food preservation and pickling agent. It is a white, crystalline substance with the chemical formula C6H5COONa.
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chicken wing
Part 1: Tendon: Give a description of the Tendon's color, texture, etc. (half a point)
Part 2: Tendon: The Tendon is attached to what tissue? (half a point)
The answers include the following:
The tendon of a chicken wing has a white color and a smooth texture.The tendon is attached to muscle and bones.What is a Tendon?Tendons are connective fibrous tissues that attaches muscle to bone and they have a bright white color together with a strong and smooth appearance which can be observed when studied.
Tendons are very important as they help in ensuring that the movement of parts of the body are easy due to its holding some structures such as ligaments in place. It is present in all bone joints due to its numerous functions in the musculoskeletal system of organisms.
The tendon is very flexible and binds the muscles in the body to other structures which is why it is referred to as a connective tissue and the above answers are the most appropriate.
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a solution was prepared by dissolving 35.0 gg of kclkcl in 225 gg of water. part a calculate the mass percent of kclkcl in the solution. express your answer with the appropriate units.
Mass percent of kcl in the solution is 12.45%
What is mass percent?
It's possible to express a degree using the mass percent. Additionally, it describes the element during a specific mixing. The mass percentage used to define the solution composition is common. It displays the amount of solute in a certain amount of solution. In terms of mass or moles, the number of solutes is indicated. We will learn the mass percent formula in this post along with several solved numerical problems.
(Component's mass minus Total Mass) times 100% Equals Mass Percentage or
(Solut's mass minus Solution's mass) times 100% equals the percentage of mass.
The mass percent formula is defined as the mass of each element in one mole of the compound, as well as the molar mass. With these masses, you can calculate each element's mass proportion.
Mass percent = mass of solute / mass of solution x 100
=32/32+225 x1000
=12.45%
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allegra (shown below) is a pharmaceutical used for allergy relief. what is the maximum number of stereoisomers possible for this structure?
Allegra a pharmaceutical product has one possible stereoisomerism and is used for getting relief from allergy
Chiral carbons in the molecule are linked to stereo-genic carbon. Chiral molecules typically have four non-identical substituents on at least one carbon atom.
Complete response: Fexofenadine is marketed under the name Allegra by pharmaceutical companies. It is a well-known antihistamine medication used to treat allergy symptoms like hay fever and urticaria.
We must understand the structure of stereo-genic carbon atoms in order to determine whether stereo-genic carbons are present in Allegra molecules. The "centre of chirality" is a stereogenic carbon atom. As a result, it is connected to chiral carbon atoms.
An asymmetric carbon atom with four different atoms or groups of atoms connected to it is called chiral carbon. There are two optical isomers for each chiral carbon in a given molecule. It is obvious from the molecular structure that the carbon atom at the extreme right is not joined to four separate groups. In its place, there are two methyl groups.
As a result, the structure contains one stereogenic carbon. An atom, often carbon, that has four distinct attachments is referred to as a stereo-centre. Since each attachment is distinct, a new molecule can be created by shifting any two attachments into a different position.
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why do isotopes of the same element have different number of neutrons?
Answer:Because to make up an atom you need different isotopes
Explanation: Because if you didnt you would have the same amount.
Help emergency plsss!!!!
calculate the volume of titrant required to reach the endpoint. calculate the volume in ml of a 0.200 m naoh solution needed to neutralize 345 ml of 0.0333 m c₆h₈o₇ standard solution.
According to the concept of molar concentration, 57.44 ml of 0.2 M NaOH is required for neutralization of 345 ml of of 0.0333 C₆H₈O₇ solution.
What is molar concentration ?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
For the given problem, in case of 2 solutions it is found out as,
M₁V₁=M₂V₂
On substitution,V₁=345×0.0333/0.2=57.44 ml.
Thus, 57.44 ml of NaOH is required for neutralization of C₆H₈O₇ solution.
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Select the correct answer.
A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 miles?
Group of answer choices
of the five elements sn, si, sb, o, te, which has the most endothermic reaction? (e represents an atom.) what name is given to the energy for the reaction?
E(g)E+(g)+e is the designation given to the reaction's energy.
Endothermic reactions: what are they?An endothermic reaction is what? Chemical reactions known to as thermally activated reactions take place when the reagents take in thermal energy from their environment and produce byproducts. These reactions produce a cooling effect by bringing the heat of the space around them down.
What is an example of an endothermic reaction?Respiration, evaporation fluids, ice melting, ice particles, alkane splitting, thermal degradation, ammonium chloride in water, and many other processes are examples of endothermic processes. Endo means "to absorb," and thermo means "heat," as the name suggests.
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How many grams of ammonium chloride are formed when 1.1 L of hydrogen chloride gas and 1.1 L of ammonia gas react? The density of the hydrogen chloride gas is 1.6 g/L and the density of ammonia is 0.77 g/L.
Grams of ammonium chloride are formed when 1.1 L of hydrogen chloride gas and 1.1 L of ammonia gas react. The density of the hydrogen chloride gas is 1.6 g/L and the density of ammonia is 0.77 g/L is 1.068 g.
given that :
volume of hydrogen chloride gas = 1.1 L
volume of ammonia = 1.1 L
Density of hydrogen chloride gas = 1.6 g/L
Density of ammonia = 0.77 g/L
the reaction is :
NH₃ + HCl ---> NH₄Cl
mass of HCl = D × v
= 1.6 × 1.1 = 1.76 g
mass of ammonia = 0.77 × 1.1 = 0.84 g
no. of moles of ammonia = mass / molar mass
= 0.84 / 36.4
= 0.02 mol
1 mole of ammonia produced 1 mole of NH₄Cl
therefore, 0.02 mol of ammonia produce = 0.02 mole of NH₄Cl
mass of NH₄Cl , ammonium chloride = no. of moles × molar mass
= 0.02 × 53.4
= 1.068 g
Thus, Grams of ammonium chloride are formed when 1.1 L of hydrogen chloride gas and 1.1 L of ammonia gas react. The density of the hydrogen chloride gas is 1.6 g/L and the density of ammonia is 0.77 g/L is 1.068 g.
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Which of the following statements is false?
A. Knowledge of chemistry allows the public to make informed decisions.
B. Studying chemistry ensures that officials make correct choices in funding technology.
C. Knowledge of chemistry helps prepare people for careers in soil science.
D. Chemistry explains many aspects of nature.
Explanation:
calculate the molar mass of the following compounds
Add a 2s sublevel orbital to your model by placing it on the 1s sublevel orbital Presently, you have two electrons in the 1s orbital. What is the maximum number of electrons for the 2s orbital?________ If an atom has three electrons, into which orbitals would they go?__________ This is the electron structure of what atom?_______
Answer: 3 or 4
Explanation:it would be air because it’s structurally atom is 3
How are a substance and a solution similar? How are they different?
A substance and a solution have both uniform composition throughout. A substance is a matter that is uniform in composition and can be an element or compound. A solution is another name for homogeneous which is a mixture.
The difference of substances and solution, a substance has a definite composition and a solution has a variable composition. It is also uniform in composition, but a solution is made by combining two or more substances.
What is Solution ?
In chemistry, a solution is a homogeneous mixture of two or more compounds in their relative proportions. The composition of the solution can be continually changed up to the solubility limit. Although solutions of gases and solids are possible, the term "solution" is most frequently used to refer to the liquid condition of matter. Brass is a solution made of copper and zinc, whereas air is primarily an oxygen and nitrogen mixture with minute amounts of other gases.
A substance and a solution have both uniform composition throughout. A substance is a matter that is uniform in composition and can be an element or compound. A solution is another name for homogeneous which is a mixture.
The difference of substances and solution, a substance has a definite composition and a solution has a variable composition. It is also uniform in composition, but a solution is made by combining two or more substances.
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What reaction would the chemical equation 2H₂O → 2H₂ + O₂ represent?
O combustion of water
O formation of water
O decomposition of water
O replacement of water
Answer:
decomposition of water
Explanation:
A combustion reaction involves carbon dioxide so it can't be that The water is not being formed The water is not replaced by the other molecules
So it is decomposition, not just from process of elimination, but also because decomposing water means heating it.
tell me what would happen if we did not have each of the different connective tissues.
Answer: If your body lacks connective tissues, you will be unable to walk or lift anything. These tissues, which include muscle fibers, bones, tendons, ligaments, and so on, allow each bodily part to communicate with one another. Without them, everything would move isolatedly - which is why they are important for movement as well as stability.
Explanation:
