Lead is one example of a heavy metal. Cobalt and cadmium. They belong to a class of chemicals known as "heavy metals". The answer is option (c).
Is lead a heavy metal?Lead is one example of a heavy metal. Cobalt and cadmium. They belong to a class of chemicals known as "heavy metals." Metallic substances with a relative high density when compared to water are referred to as heavy metals. Assuming that weight and toxicity are connected, heavy metals have included metalloids like arsenic, which can cause toxicity at low exposure levels.
Although heavy metals are generally found in nature and are necessary for life, they can become poisonous when they build up in organisms. Among the heavy metals that can poison the environment, arsenic, cadmium, and mercury are the most prevalent.
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Find the balance equation
_H2O+_O2=_H2O2
The balanced reaction equation of the reaction is; 2H2O + O2 → 2H2O2
How do we balance reaction equation?This is a chemical equation that represents the reaction between water (H2O) and oxygen (O2) to form hydrogen peroxide (H2O2). The coefficients in front of each substance indicate the relative number of molecules involved in the reaction.
Recall that we can balance the reaction equation by ensuring that the atoms of the elements on both sides of the reaction equation are the same as we have above.
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Calculate Kc for the following reaction: 2NOBr(g)⇌2NO(g)+Br2(g) kc= 2.1x10^-2
The value of Kc for the following reaction: 2NOBr(g)⇌2NO(g)+Br2(g) kc = 2.1x10^-2
What is meant by value of Kc?
The Kc is described as the equilibrium constant measured in moles per liter.
The equilibrium constant, K, is used to express the relationship between products and reactants of a reaction at equilibrium with respect to a specific unit.
The numerical value of an equilibrium constant can be obtained by letting a single reaction proceed to equilibrium and then measure the concentrations of each substance that is involved in that reaction.
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The electrons are arranged in two different energy levels. There are _____ in the first energy level and _____ in the second energy level.
The second floor may hold a maximum of eight electrons with two in the s orbital and 6 each of the triple p orbitals. Five d orbitals are grouped together for each principal level of energy above the second.
Are there several sorts of energy?Despite the numerous different kinds of energy, kinetic and potential energy are the two main categories. Energy is the force that propels moving mass or objects. Examples include electrical and mechanical energy, among others.
What are the two energy types and what example best illustrates each?Potential or kinetic energy are the two types of energy. Chemical, electric, gravitational, mechanical, and radioactive forms of potential energy can all be stored. Work is being done by kinetic energy forms like heat, lighting, motion, and sound.
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O2 is which of the following?
Both compound and molecule
One atom
compound
Molecule
The chemical formula O₂ which is oxygen is a molecule as it is made up of 2 oxygen atoms.
What is chemical formula?
Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
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suggest an explanation of why the concentration of the sulfuric acid increases.
Hydrogen is formed at the negative electrode (cathode) and oxygen at the positive electrode (anode) and the concentration of sulfuric acid increases.
What is Electrolysis?Direct electric current is used in the electrolysis process to accelerate chemical reactions that would not naturally occur.
It can be seen that as the electrolysis proceeds the dilute sulfuric acid gets slightly more concentrated as only water is removed from the electrolyte as hydrogen and oxygen.
The ions present in the dilute acid are H+(aq), OH–(aq) and SO4 2–(aq).
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suggest an explanation of why the concentration of the sulfuric acid increases during electrolyis
How many moles of atoms are in each elemental sample?
(a) 4.6 X 1024 Pb atoms
(b) 2.87 × 10- He atoms
(c) 7.91 × 102 K atoms
(d) 4.41 × 10- Ca atoms
The 1987 Nobel Prize in Physics was awarded to J. G. Bednorz and K. A. Müller for their discovery of superconducting ceramic materials such as
YBa₂Cu3O7. The figure here shows the unit cell of another yttrium-barium-copper oxide.
The molecular formula for the compound is YBa2Cu3O8
The number of atoms per unit cell is calculated by using the following formula:
The number of atoms per unit cell× its contribution
Thus, the number of oxygen atoms is calculated= 8
Therefore, the molecular formula for the compound is YBa2Cu3O8.
What is a molecular formula?
A chemical formula is a way of presenting information about the chemical ratios of atoms that make up a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes other symbols such as parentheses, dashes, parentheses, commas, and plus and minus signs.To know more about molecular formula, click the link given below:
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Intermolecular attractions that form between nonpolar substances in water are called__________
interactions.
Intermolecular attractions that form between nonpolar substances in water are called Hydrophobic interactions.
What do you mean by Intermolecular attraction?Intermolecular attraction refers to the attractive forces between molecules. These forces determine many of the physical properties of a substance, such as its boiling and melting points, surface tension, and viscosity. There are several types of intermolecular attractions, including hydrogen bonding, dipole-dipole interactions, and London dispersion forces.
Hydrogen bonding occurs between molecules that contain hydrogen and electronegative elements such as nitrogen, oxygen, and fluorine. Dipole-dipole interactions occur between polar molecules, where one end is positively charged and the other end is negatively charged. London dispersion forces are the result of temporary dipoles that form in nonpolar molecules and attract each other.
Intermolecular attraction plays a crucial role in the behavior of liquids and solids, and it helps to explain the properties of substances such as why some substances are liquids at room temperature, while others are solids. The strength of intermolecular attractions can be influenced by temperature, pressure, and other environmental factors, which can have a significant impact on the physical properties of a substance.
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When 16.3 g of magnesium and 45.2 g of oxygen gas react, how many grams of magnesium oxide will be formed? Identify the limiting and excess reactants.
Mg is the limiting reactant and the oxygen is the reactant in excess.
What is the reaction?In this case we have to know the equation of the reaction as that would help us so as to obtain the stoichiometry of the reaction and thus do the calculations.
We then have that;
Number of moles of mg = 16.3 g/24 = 0.7 moles
Number of moles of O2 = 45.2 g/32 g/mol = 1.4 moles
The reaction equation is; 2Mg + O2 = 2 MgO
If 2 moles of Mg reacts with 1 mole of O2
0.7 moles of Mg would react with 0.7 * 1/2
= 0.35
Hence the Mg is the limiting reactant and the oxygen is the reactant in excess.
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28 °℃ = __? __K
help.
Answer:
301.15 K
Explanation:
please due friday but want to do today
Answer: 3.44%
Explanation: try it for math
balance the equation NaHCO3+H3C6H5O7=CO2+H2O+NA2C6H5O7
Answer:
The balanced chemical equation for the reaction between sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7) is:
NaHCO3 + H3C6H5O7 -> CO2 + H2O + Na2C6H5O7
Explanation:
In this reaction, sodium bicarbonate and citric acid react to form carbon dioxide (CO2), water (H2O), and sodium citrate (Na2C6H5O7). The coefficients in front of each substance indicate the relative number of moles of that substance involved in the reaction. In this case, the coefficients are already balanced, meaning that there are equal numbers of atoms of each element on both sides of the equation.
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Helium gas diffuses twice as fast as gas X.Calculate the relative molecular mass and relative density of gas X ? (He=4)
The vapor density of the gas X is 8.
How does a gas diffuse?
A gas diffuses by the random movement of its particles. In a container of gas, the individual gas particles are constantly moving in random directions and colliding with each other and the walls of the container. This random motion causes the particles to spread out evenly, leading to diffusion.
From the Graham's law; we have that;
R1/R2 = √M2/M1
2/1 = √M2/4
4/1 = M2/4
16 = M2
The vapor density of the gas X is 0.5 * 16 = 8
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Calculate the number of degree of freedom for a system made up of Ice and water at equilibrium. (A) 0 (B) 1 (C) 2 (D) 3
The number of degrees of freedom for a system made up of ice and water at equilibrium is 1.
The correct option is B.
What are thermodynamic degrees of freedom?A molecule's degree of freedom is how many different ways it can move, rotate, or vibrate in space when it is in the gas phase. There are three different kinds of degrees of freedom: translational, rotational, and vibrational.
The Gibbs phase rule states that F = C − P + 2.
where
F is the degree of freedom
C is the component
P is the phase involved
As a result, there are two degrees of freedom for a one-component, one-phase system, and any temperature and pressure are achievable within certain bounds.
From the phase rule formula:
F = C - P + 2
C is water = 1
P is liquid water and ice = 2
Hence,
F = 1 - 2 + 2
F = 1
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An electron is confined in a potential well of 1 Å width.
What is the energy difference between the third and first energy states?
The energy difference between the third and first energy states of an electron confined in a potential well of 1 Å width depends on various factors such as the depth of the potential well and the mass of the electron.
What is known as energy states?Energy states refers to any discrete value from a set of values of total energy for a subatomic particle confined by a force to a limited space or for a system of such particles, such as an atom or a nucleus.
The excitation energy stored in excited atoms and nuclei is radiated usually as visible light from atoms and as gamma radiation from nuclei as they return to their ground states.
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the total pressure of gas collected over water is 650 mmHg and the temperature is 19.5c what is the pressure of hydrogen gas formed in mmHg?
The pressure of hydrogen gas formed in mmHg is 633.5mmHg.
About Pressure
In physics, pressure is the magnitude of the force acting per unit area of surface or area of pressure. This phenomenon arises as a result of the compressive force acting on an object per unit surface area in a perpendicular direction.
A pressure will depend on the magnitude of the force. The amount of pressure generated is in line with the amount of force exerted or directly proportional to the force. On the one hand, pressure is inversely proportional to surface area. If the surface area of the compressive field is enlarged, then the pressure will decrease.
The international unit of pressure is Newton per meter squared or N/m2. Meanwhile, the amount of pressure is symbolized by the letter P or p. Besides N/m2, pressure has another unit of measurement, namely Pascal (Pa), which is taken from the name of the French physicist, Blaise Pascal.
Based on question above, the calculation is:
Pressure of hydrogen gas = total pressure - vapor pressure of water
Vapor pressure of water at 19°C = 16.5 mmHg
Hydrogen gas pressure = 650.0mmHg to 16.5mmHg = 633.5mmHg
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Which phrases apply to metamorphic rock formation? Check all that apply.
form from existing rocks
form without melting
appear foliated or non-foliated
form from liquid rock
form from deposition
require heat and pressure to form
Metamorphic rock formation involves the transformation of existing rocks under heat and pressure. They form without melting and can appear foliated or non-foliated.
Explanation:Metamorphic rocks are formed from the transformation of existing rock types in a process called metamorphism, which means 'change in form'. The appropriate phrases that describe metamorphic rock formation are: 'form from existing rocks', 'form without melting', 'appear foliated or non-foliated', and 'require heat and pressure to form'. These rocks are subject to conditions of heat and pressure that cause them to change physically and/or chemically, resulting in a new type of rock. They can either be foliated (layered) or non-foliated. Importantly, metamorphic rock formation does not include a liquid state, meaning they do not 'form from liquid rock' or 'form from deposition'.
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The German
(1868-1934;
Prize in
Chemistry
1918) was
able to
synthesize ammonia (NH3) by
reacting 0.1248 M H₂ and 0.0416 M
N₂ at about 500°C. At equilibrium, the
mixture contained 0.00272 M NH3.
What is K for the reaction N₂ + 3H₂ =
2NH3at this temperature? What is Kp?
chemist Fritz Haber
Nobel
At 298 K, the reaction N2(g) + 3H2(g) 2NH3(g) results in an enthalpy change (H) of -92.38 kJ.
What is the effect of temperature on the equilibrium N2 3H2 ⇋ 2NH3?N2(g) + 3H2(g) 2NH3(g) + Heat is the equation for our equilibrium reaction. Think about increasing the nitrogen gas concentration. Since the reaction is pushed to the right when nitrogen gas concentration is increased, we may be certain that the equilibrium will shift to the right.Kp for the N2 + 3H2 2NH3 reaction at 400°C is 1.64 10-4. Iron catalyst addition will not change the reaction's state of equilibrium. The general statement: Kp = Kc(RT) (RT) It is possible to derive n by taking into account the moles of gaseous products and reactants.N2 (g) + 3 H2 (g) 2 NH3 (g) If equal amounts of each reactant are utilised, hydrogen will be the limiting agent because it takes 3 moles of hydrogen to produce 1 mole of ammonia.To learn more about enthalpy refer to:
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CAN SOMEONE HELP WITH THIS QUESTION BELOW?✨
If a plot of weight (in g) vs. volume (in mL) for a metal gave the equation y=15.28x and R^2=0.9981, what is the density of the metal?
Answer:- density = 13.41 g/ml
Density (d) of a substance is the mass (m) occupied by it in a given volume (v).
Density mass/volume =
i.e. d = m/v
m = (d) v -----(1)
The given equation from the plot of weight vs volume is :
y = 13.41 x ---- (2)
Based on equations (1) and (2) we can deduce that the density of the metal is 13.41 g/ml
What is the empirical formula of phosphorus sulfide? A 43.6-mg sample of phosphorus reacts with sulfur to form 156 mg of the compound phosphorus sulfide.
The empirical formula of phosphorus sulfide is P[tex]_2[/tex]S[tex]_3[/tex]. The definition of an empirical formula for a compound is one that displays the ratio of the components present.
What is empirical formula?The definition of an empirical formula for a compound is one that displays the ratio of the components present in the complex but not the precise number of atoms in the molecule. Subscripts are used next to the component symbols to indicate the ratios.
the mass of S used = 156 mg-43.6mg= 79.4 grams
moles of phosphorous= 43.6/12= 3.717 moles
moles of sulfur (S) = 79.4/32= 2.48 moles
phosphorous= 3.717/2.48 = 1.5
sulfur = 2.48/2.48= 1
the empirical formula of phosphorus sulfide is P[tex]_2[/tex]S[tex]_3[/tex].
Therefore, the empirical formula of phosphorus sulfide is P[tex]_2[/tex]S[tex]_3[/tex].
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When 2 moles of ammonia (NH₃) decomposes into nitrogen gas (N₂) and hydrogen gas (H₂), how many moles of hydrogen gas are produced?
Answer:
When 2 moles of ammonia (NH3) decomposes into nitrogen gas (N2) and hydrogen gas (H2), the balanced chemical equation for the reaction is:
2 NH3 -> N2 + 3 H2
Therefore, 3 moles of hydrogen gas (H2) are produced for every 2 moles of ammonia (NH3) that decomposes.
Use the chemical equation to answer the question. 2Ag(s) + H₂S(g) → Ag₂S(s) + H₂(g) The molar mass of silver (Ag) is 108 g/mol. The molar mass of sulfur (S) is 32 g/mol. The reaction uses 0.04 mol of silver. Which steps show how to determine the mass of silver sulfide (Ag₂S) produced in the reaction?
As per the given balanced reaction, 2 moles of silver gives 1 mole of the product silver sulfide. Hence, 0.04 moles will given 0.02 moles of silver sulfide.
What is theoretical yield of a reaction?The theoretical yield of a reaction is the amount of product obtained based on the balanced chemical equation of the reaction. However, the actual yield might vary from the the theoretical value.
The given reaction of Ag and H₂S shows that, two moles of Ag produce one mole of the product silver sulfide.
Number of moles of silver sulfide produce by 0.04 moles of Ag is then half of this number that is 0.02 moles of Ag₂S.
Therefore, 0.0 moles of Ag will give 0.02 moles of silver sulfide. Using the same way, we can determine the yield of products in any reaction.
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Identify the scenarios below as to whether they would increase or decrease the resistance of an electric current though a body.
Answer: Increase Resistance- lenght of conductor, Decrease resistance- Utilize a conductor with a larger cross-section, Decrease Resistance- Cool the conductor to lower its temperature
Explanation:
The resistance of an electric current can increase or decrease depending on the material it's passing through, the length of its path, its cross-sectional area, and the temperature. Lower resistances are found in metals like copper or aluminum, or in paths with a larger cross-sectional area. Higher resistances are found in materials like rubber or glass, in longer paths, or at higher temperatures.
Explanation:There are several factors that can increase or decrease the resistance of an electric current passing through a body. These could include:
Material: Different materials have different resistances. For instance, metals like copper or aluminum have low resistance, while materials such as rubber or glass have high resistance.Length: The longer the path through which the current has to flow, the more resistance there will be.Cross-sectional area: A larger cross-sectional area will offer less resistance as there are more paths for the current to take.Temperature: Generally, the resistance of a material increases as its temperature increases.Learn more about Electric Current Resistance here:https://brainly.com/question/20382684
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CAN SOMEONE HELP WITH THIS QUESTION?✨
Rikki has a sample of water but he is not sure if it is pure or not. He heats the water until it begins to boil. He records the temperature which is 103°C. Is this water pure?
The sample of water is impure because the boiling point is above 100°C.
What is boiling point?Boiling point is the temperature at which a liquid boils, with the vapor pressure equal to the given external pressure.
The boiling point of pure water is 100 °C or 212 °F at 1 atmosphere of pressure (sea level).
The boiling point of water also depends on the purity of the water. Water that contains impurities (such as salted water) boils at a higher temperature than pure water. This phenomenon is called boiling point elevation.
According to this question, a sample of water boils at 103°C, hence, the water is impure.
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What would be the volume in mL of 5.097 g of water delivered by a 5 mL pipet? You observe the temperature and find the density to be 0.9960 g/mL. Do not use units in answer and record to 3 significant figures.
The volume of the water is 5.11 mL.
What would be the volume?Density is a measure of mass per unit of volume of a substance. It is a physical property of matter and is expressed in units of grams per cubic centimeter (g/cm^3).
The density of a substance determines how much of it will occupy a given space, and is a crucial factor in many physical and chemical phenomena, such as buoyancy, phase changes, and thermal conductivity.
We have that;
Volume of the water = ?
Density of the water = 0.9960 g/mL
Mass of the water = 5.097 g
Volume of the water = Mass/Density
= 5.097 g / 0.9960 g/mL
= 5.11 mL
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can two objects have the same mass and volume but be made of a different substance?explain.
Answer:
Yes
Explanation:
The two different material would have the same density but different chemical properties. Melting point/ boiling point etc would likely be different between the two materials too.
The weight of the ground above the rift had been pressing down on the New Madrid faults, holding back the stored-up stress for millions of years. As the river washed away the ground, a huge weight was lifted from Earth's crust."
What do Freed and his colleagues think happened as that pressure eased?
Fred and his colleagues believe that as the pressure eased, the failures also decreased and stimulated the various earthquakes that are likely to be noticed in New Madrid.
What is Fred and his study?Fred and his study colleagues came to the conclusion that the weight of the soil above the speech was retained. The tension that this scenario created in the area after investigating the source of the failure in New Madrid and the effects this creates.
However, the river that ran through this area started to take away the materials above the ground, which gradually reduced weight and pressure.
Therefore, according to Fred and his colleagues, the different earthquakes that are expected to be felt in New Madrid were sparked by the failures that also diminished as the pressure subsided.
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How much energy (in kilojoules) is released when 12.8 g of steam at 120.0 ∘C is condensed to give liquid water at 64.0 ∘C ? The heat of vaporization of liquid water is 40.67 kJ/mol , and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6 J/(K⋅mol) for the vapor.
According to specific heat capacity, 3.010 kilojoules of energy is released when 12.8 g of steam at 120.0 °C is condensed to give liquid water at 64.0 °C .
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT, substitution of values in formula gives Q=12.8×4.2×56=3010 J or 3.010 kJ.
Thus, 3.010 kilojoules of energy is released when 12.8 g of steam at 120.0 °C is condensed to give liquid water at 64.0 °C .
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How many grams of hydrogen gas will be produced if 2.5 moles of tin react?
Answer:
I believe it's 5.0 g of hydrogen
Explanation:
Sorry if i'm wrong