Mg + HCI → MgCl2 + H2 balance equation you can not add subscripts or place coefficients in the middle of a chemical formula
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plsssss help with this ill give brainliest to first answer
How does the concept of conservation of mass apply to chemical reactions?
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Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Please help? It’s for chem
Answers
Answer:
O-H
Explanation:
It is polar covalent bond, because the hydrogen atom has electronegativity about 2.6, and the oxygen atom, electronegativity about 3.6. When the difference in electronegativity of the atoms is between 0.4 and 1.7, the result is a polar covalent bond.
Part C
What is produced at each electrode in the electrolysis of an aqueous solution of both NaBr and AgF?
Drag the appropriate items to their respective bins.
Anode Cathode not produced
Na(s) H2(g) Ag(s) F2(g) O2(g) Br2(l)
Answers
Oxidation takes place at the anode, where a chemical with a high oxidation potential may easily oxidize, leading to the formation of bromine.
2H2O's oxidation potential is O2 + 4H+ + 4e-, which equals -1.23 volts.
Is hair permanently removed by electrolysis?Yes, all skin tones may have their hair permanently removed via electrolysis. It is the only permanent hair removal method that has received FDA approval. The hair won't come back since electrolysis permanently kills the growth cells in the hair follicles.
What adverse consequences might electrolysis cause?Tenderness, redness, and a little swelling are the most frequent after-electrolyse adverse effects. All of these adverse effects are transitory and normal. When performed incorrectly, electrolysis can result in infection and long-lasting scars.
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The half-reaction at the cathode in an electrochemical cell is given below. What other half-reaction would most likely occur at the anode to produce a spontaneous reaction?
Ni^2(aq)+2e-=Ni(s)
A. Cu(s)=Cu^2+(aq)+2e-
B. Zn(s)=Zn^2+(aq)+2e-
C. Mg^2+(aq)+2e-=Mg(s)
D. Ni(s)=Ni^2+(aq)+2e-
Answers
The half-reaction is Zn → Zn⁺² + 2e⁻ which is most likely occur at the anode to produce a spontaneous reaction.
Hence, option (B) is correct answer.
What is Spontaneous Reaction ?A reaction which occurs without the intervention of outside is called Spontaneous reaction. The reaction is Spontaneous when the Δ G < 0 and \(E^{\circ}_{\text{cell}}\) > 0.
What is Cathode and Anode ?Cathode where the reduction occurs. Anode where the oxidation take place.
Cathode: Ni⁺² + 2e⁻ → Ni
Anode: Zn → Zn⁺² + 2e⁻
______________________
Zn + Ni⁺² → Zn⁺² + Ni
The above reaction is spontaneous reaction.
Thus, from the above conclusion we can say that half-reaction is Zn → Zn⁺² + 2e⁻ which is most likely occur at the anode to produce a spontaneous reaction.
Hence, option (B) is correct answer.
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A closed container is filled with oxygen. The pressure in the container is 355 kPa What is the pressure in
millimeters of mercury?
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A student is studying a sample of carbon dioxide gas inside a small syringe. At constant temperature the syringe has a volume of 89. 6 ml at a pressure of 3. 00 atm. When the syringed is expanded to a volume of 215 ml, what is the new pressure inside the syringe?.
Answers
The new pressure inside the syringe will be 1.25 atm
Gas lawAt constant temperatures, the volume of a gas is inversely proportional to its pressure.
Thus: P1V1 = P2V2
In this case, P1 = 3.0 atm, V1 = 89.6 mL, V2 = 215 mL
P2 = P1V1/V2
= 3 x 89.6/215
= 1.25 atm
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What are the 3 properties of compounds?
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A compound is a substance that is formed when two or more elements chemically combine in a fixed ratio by mass.
Compound is a substance that is made from two or more different elements that have been chemically joined. Some of the examples of compounds includes water (H₂O), which is made from the elements hydrogen and oxygen, and table salt (NaCl), which is made from the elements sodium and chloride.
Important properties of compounds.
Elements in a compound are always in fixed proportion.Compounds can be broken down into chemical form only.Particles present in the compounds are of one kind only.Compounds are homogenous in nature i.e. identical.Learn more about compounds from the link given below.
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Start with solid argon and explain how to make argon change to the liquid state and then to the gaseous state
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Starting with solid argon at room temperature, we need to cool it to -189.2 c to convert it into the liquid state.
Then, we need to heat it slightly till it reaches a temperature of -185.7 c. At this temperature, the liquid argon will convert into gaseous argon.
There are three states of matter i.e, solid state, liquid state, and gaseous state. These states are interconvertible which means that we can convert a substance from one state to another.
The conversion from solid to liquid and then gas or vice versa happens at specific temperatures that are known as boiling point, melting point, freezing point, etc.
The melting point is the temperature at which a solid gets converted into a liquid.
The boiling point is the temperature at which a liquid gets converted into a gas.
The melting and boiling points of Argon are -189.2 °C and -185.7 °C respectively.
Thus, starting with solid argon at room temperature, we need to cool it to -189.2 °C to convert it into the liquid state.
Then, we need to heat it slightly till it reaches a temperature of -185.7 °C. At this temperature, the liquid argon will convert into gaseous argon.
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The process of wearing down by friction-like sand blasting is called
O exfoliiation
O erosion
O Wind Abrasion
O deposition
Answers
Answer:
Erosion
Explanation:
Abrasion is a process of erosion which occurs when material being transported wears away at a surface over time. It is the process of friction caused by scuffing, scratching, wearing down, marring, and rubbing away of materials. ... Objects transported in waves breaking on coastlines cause abrasion.
How many moles in 3.01 x 1022 atoms of Xenon?
Answers
Answer:
0.05 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
\(n = \frac{N}{L}\\\)
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
\(n = \frac{3.01 \times {10}^{22} }{6.02 \times {10}^{23} } = \frac{1}{20} \\ = 0.05\)
We have the final answer as
0.05 molesHope this helps you
Since tear osmolarity is a function of tear evaporation in either ADDE or EDE, tear hyperosmolarity arises due to evaporation from the ocular surface and, in that sense, all forms of DED are evaporative.
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Tear hyperosmolarity refers to the increased concentration of solutes in tears, which can occur in both aqueous-deficient dry eye (ADDE) and evaporative dry eye (EDE).
In both cases, tear osmolarity is influenced by tear evaporation.
In ADDE, tear hyperosmolarity arises due to a decreased production of tears. When the lacrimal glands fail to produce enough tears, the remaining tears evaporate more rapidly, leading to an increased concentration of solutes in the tears. This results in tear hyperosmolarity.
In EDE, tear hyperosmolarity arises due to increased tear evaporation from the ocular surface. Factors such as a disrupted tear film lipid layer or reduced blinking can lead to increased evaporation, causing an increase in tear osmolarity.It is important to note that while tear hyperosmolarity is associated with both ADDE and EDE, not all forms of dry eye are evaporative. There are other subtypes of dry eye, such as aqueous-deficient and mixed dry eye, where tear hyperosmolarity may not be primarily driven by evaporation.
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The activation energy for the reaction H2(g) + I2(g) --> 2HI(g) is changed from 184 kJ/mol to 59.0 kJ/mol at 600 K by the introduction of a Pt catalyst. Calculate the value of the ratio rate(catalyzed)/rate(uncatalyzed).
A) 1.00
B) 7.62 x 10^10
C) 1.38
D) 0.321
E) none of these
Answers
7.62 x 10^10 is the value of the ratio of rate(catalyzed)/rate(uncatalyzed). The correct option is B.
Thus, the Arrhenius equation, which links the rate constant (k) to the activation energy (Ea) and temperature (T), is used to calculate the ratio of rate(catalyzed)/rate(uncatalyzed).
rate(catalyzed) / rate(uncatalyzed) = (k_catalyzed / k_uncatalyzed)
First, let's calculate the rate constant for the uncatalyzed reaction:
k_uncatalyzed = A * exp(-Ea_uncatalyzed / (R * T))
Then, calculate the rate constant for the catalyzed reaction:
k_catalyzed = A * exp(-Ea_catalyzed / (R * T))
Now, let's substitute the given values into the equations and calculate the ratio:
rate(catalyzed) / rate(uncatalyzed) = (k_catalyzed / k_uncatalyzed) = (A * exp(-Ea_catalyzed / (R * T))) / (A * exp(-Ea_uncatalyzed / (R * T)))
The pre-exponential factor (A) cancels out, so we have:
rate(catalyzed) / rate(uncatalyzed) = exp((-Ea_catalyzed + Ea_uncatalyzed) / (R * T))
Substituting the given values:
rate(catalyzed) / rate(uncatalyzed) = exp ((-59.0 - (-184)) / (8.314 * 600))
rate(catalyzed) / rate(uncatalyzed) = exp (125 / 4988.4)
Now, let's calculate this value:
rate(catalyzed) / rate(uncatalyzed) ≈ 7.62 x 10^10
Thus, the ideal selection is option B.
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Gases are in corresponding states when they have the same reduced temperatures and pressures. Under what condition is H2 in a state corresponding to CO2 at 400 K and 10.0 bar. (Given Tc=33.2 K, Pc=13.0 bar for H2 and Tc=304.2 K, Pc=73.7 bar for CO2
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The condition that H₂ must be under to be in corresponding states with CO₂ is at a temperature of approximately 43.6 K and a pressure of approximately 1.77 bar.
To find the condition when H₂ is in a corresponding state to CO₂ at 400 K and 10.0 bar, we'll use the reduced temperatures and pressures. Reduced temperature (Tr) and reduced pressure (Pr) can be calculated using the critical temperature (Tc) and critical pressure (Pc) with the following formulas:
Tr = T / Tc
Pr = P / Pc
For CO₂, Tr_CO₂ = 400 K / 304.2 K ≈ 1.315 and Pr_CO₂ = 10.0 bar / 73.7 bar ≈ 0.136.
Now, we need to find the conditions for H₂, where Tr_H₂ = Tr_CO₂ and Pr_H₂ = Pr_CO₂:
Tr_H₂ = T_H₂ / 33.2 K = 1.315 => T_H₂ ≈ 43.6 K
Pr_H₂ = P_H₂ / 13.0 bar = 0.136 => P_H₂ ≈ 1.77 bar
So, H₂ is in a state corresponding to CO₂ at 400 K and 10.0 bar when it is at a temperature of approximately 43.6 K and a pressure of approximately 1.77 bar.
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Which best describes the difference between radiation and conduction? (1 point)
A.) Conduction cannot happen when both objects are solids.
B.)
Conduction requires two objects to be in physical contact.
C.)
Conduction can occur between two objects that are very far apart.
D.)
Conduction decreases the movement of the atoms in both objects.
Answers
Answer:
B) Conduction requires two objects to be in physical contact.
Explanation:
Conduction is when two objects are directly touching each other. So, the objects must come in physical contact with each other.
Explain the relationship between pressure and boiling point using the terms kinetic energy, attraction, and thermal energy.
Please help me :(
Answers
Answer:
Do you have any options, it will narrow down and we can give you the answer alot faster
Explanation:
Relation between Boiling Point and Pressure is the system pressure is directly proportional to boiling point, If the system pressure is higher, more energy will be needed to create vapor pressure equal to the pressure.
what are boiling point ?The boiling point can be defined as the temperature at which the vapor pressure of a liquid is equal to the external pressure, where as another term called Melting point in which the solid will start melting to become a liquid at a given temperature.
On the other hand the freezing point is the temperature at which a liquid is converted into solid occur.
In Boiling point the liquid substance enters into the gaseous phase, if the external pressure is high, which can lead to increase the temperature for the vapor pressure to become equal to the external pressure.
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a quantity of 12.68 ml of a koh solution is needed to neutralize 0.3658 g of khp. what is the concentration (in molarity) of the koh solution? (the molar mass of khp is 204.2 g/mol.
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a quantity of 12.68 ml of a koh solution is needed to neutralize 0.3658 g of khp.the concentration (in molarity) of the koh solution is 0.0825 (M)..
KOH & KHP are reacting in 1:1 ratio . KOH + KHP -------------> K2P + H2O. Mole of KHP = Weight given / Molar mass = 0.2138 / 204.2 = 0.001047 mole. So, to neutralize it , the mole of KOH have to be 0.001047 mole .We know Molarity X Volume ( in liter ) = moleSo, Molarity X (12.68 / 1000) = 0.001047 . So, Molarity of KOH = 0.0825 (M).
The quantity of a substance in a particular solution volume is characterized as its molarity (M). The number of moles of a component per litre of a solution is known as molarity. The molecular concentration in a solution is also another name for molarity. Molarity concentration calculates the quantity of a substance per unit volume of the solution and specifically the concentration of a solute in a solution. The most used molarity unit in chemistry is the amount of moles per litre, denoted by the unit sign mol/L or mol/dm3 in SI units. The amount of moles per litre, represented by the si sign mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.
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Part A Properly using a centrifuge requires that several important steps be performed correctly. Choose the three main steps in properly using this piece of equipment. a. Using a test tube with approximately the same volume as your sample tube to balance the centrifuge b.Placing the test tubes side by side for best separation. c. Stop the roation of the centruluge by using a paper towel or stopper until stopped d. Using the exact same type of test tube and solution in 3-4 test tubes. e. Ensuring the centrifuge is completely stopped before removing samples f. Placing the test tubes across from each other to balance out the centrifuge.
Answers
Placing the test tubes across from each other to balance out the centrifuge.
Using a test tube with approximately the same volume as your sample tube to balance the centrifuge
Ensuring the centrifuge is completely stopped before removing samples
How do you use a centrifuge?Ensure that the centrifuge is clean, balanced, and in good working condition. Select the appropriate rotor and tube size for the sample, and check the maximum speed and time limit of the centrifuge.
Close the centrifuge lid securely, and ensure that it is locked in place. Failure to properly secure the lid can result in the rotor becoming unbalanced and dangerous.
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Explain how the type of an atom is defined?
Answers
ANSWER = PROTONS
How the type of an atom is defined is
An Atom is defined by how many Protons and Neutrons in its nucleus and electrons in its energy levels
From the question we are told that
How the type of an atom is defined
Generally
It is important to note that atoms are defined strictly by its Embodiment which are its electron protons and Neutrons
An Atom is defined by how many Protons and Neutrons in its nucleus and electrons in its energy levels
Therefore
An Atom is defined by how many Protons and Neutrons in its nucleus and electrons in its energy levels
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Which atoms are most common in our sun????
Answers
Answer:
HOPE THIS HELPS
Helium and Hydrogen
Explanation:
Hydrogen and helium: they are by far the most abundant elements found in the Sun, making up about 98 percent of its mass, but other, heavier elements play an important role in the physical processes that occur in the Sun.
how many moles of naoh are present in 25.0 ml of 0.787 m naoh solutions?
Answers
There are approximately 0.019675 moles of NaOH present in 25.0 mL of a 0.787 M NaOH solution.
To determine the number of moles of NaOH present in 25.0 mL of a 0.787 M NaOH solution, you can follow these steps:
1. Convert the volume of the solution from milliliters (mL) to liters (L). There are 1,000 mL in 1 L, so divide the volume by 1,000:
25.0 mL ÷ 1,000 = 0.025 L
2. Use the given molarity of the NaOH solution, which is 0.787 moles of NaOH per liter (M):
0.787 moles/L
3. Multiply the volume in liters (0.025 L) by the molarity (0.787 moles/L) to find the number of moles of NaOH:
0.025 L × 0.787 moles/L = 0.019675 moles
So, there are approximately 0.019675 moles of NaOH present in 25.0 mL of a 0.787 M NaOH solution.
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Which of the following is a way that human modification of limiting factors causes unbalance in ecosystems.
Answers
Answer:
D. all of the above
Explanation:
edg 2021
A way that human modification of limiting factors causes unbalances in ecosystems. are habitat loss, pollution, and climate change. Option D. This is further explained below.
What is an ecosystem.?Generally, An ecosystem is a geographical region in which plants, animals, and other species, as well as weather and topography, coexist to produce a circle.
In conclusion, habitat loss, pollution, and climate change are all human modification of limiting factors causes unbalance in ecosystems.
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CQ
which of the following is a way that human modification of limiting factors causes unbalance in ecosystems? a. habitat loss b. pollution c. climate changes d. all of the above
Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?
Answers
Answer:
"The strength of ionization decreases as the proportion including its protons to the excited electrons" is the right solution.
Explanation:
The ionizing procedure, the creation of ions through manipulating individual atoms or revolutionaries, or through decreasing or increasing charged particles in something other than gas by intense electrical fields.It should be the total removal of someone with an electron through an atomic nucleus rather than from molecules. The corresponding molecule has denominated an ion.This question seems incomplete. I believe the answer choices are as followed:
O The ionization energy decreases because the ratio of the protons to electrons increases.
O The ionization energy increases because the ratio of the protons to electrons increases.
O The ionization energy decreases because the ratio of the protons to electrons decreases.
O The ionization energy increases because the ratio of the protons to electrons decreases.
The answer to this is The ionization energy increases because the ratio of the protons to electrons increases. (2nd option).
How many grams of LiF are needed to make 87 g LiF solution into a
34.5% solution?
solution?
answer options:
30 g LIF
0.01 g LIF
45.8 g LIF
0.02 g LIF
Answers
Answer: 30 g LiF
Explanation:
Sec. Ex. 3 - Radioactivity of elements (Parallel B) Decide if the following nuclei are radioactive or stable. aluminum \( -25 \) technetium-95 \( \operatorname{tin}-120 \) mercury-200
Answers
Aluminum-25 is stable, technetium-95 is radioactive, and tin-120 is stable. Mercury-200 is also stable.
Radioactive elements undergo spontaneous decay, emitting radiation in the process. Stable elements, on the other hand, do not undergo such decay. In the given list, aluminum-25 and tin-120 are both stable nuclei, meaning they do not exhibit radioactivity. This implies that the number of protons and neutrons in their atomic nuclei is balanced, resulting in a stable configuration.
Technetium-95, however, is a radioactive nucleus. Radioactive isotopes have an unstable configuration, leading to the emission of radiation in the form of alpha particles, beta particles, or gamma rays. Technetium-95 undergoes radioactive decay over time, transforming into different elements as it seeks a more stable atomic configuration.
Mercury-200 is classified as a stable nucleus. Despite its relatively high atomic number, it maintains a balanced arrangement of protons and neutrons, making it resistant to radioactive decay.
In summary, aluminum-25 and tin-120 are stable nuclei, while technetium-95 is radioactive. Mercury-200 is also stable.
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Compare and contrast the carbon cycle of 1500 and of 2021
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Answer:
Carbon moves from the atmosphere to the land, ocean, and life through biological, chemical, geological and physical processes in a cycle called the carbon cycle. Because some carbon gases are greenhouse gases, changes in the carbon cycle that put more carbon in the atmosphere also warm Earth’s climate.
In a reaction, your actual product had a mass of 13.7 grams. You calculated that you need 29.3 grams to have the reaction go to completion. What is your percent yield?
Answers
Answer:
5.0
Explanation:
what is the molecular shape of the following molecule?
Answers
The molecular shape of a molecule is determined by the number of bonding and non-bonding electron pairs around the central atom. Without knowing the specific molecule, we cannot provide a direct answer to its molecular shape.
In order to determine the molecular shape of a molecule, we need to know the number of bonding and non-bonding electron pairs around the central atom. This can be done using the VSEPR theory.
The molecule in question is not specified, so we cannot provide a specific answer. However, I can explain the general process of determining molecular shape.
First, we need to draw the Lewis structure of the molecule, which shows the arrangement of atoms and the bonding and non-bonding electron pairs. Then, we count the number of bonding and non-bonding electron pairs around the central atom.
Based on the number of electron pairs, we can determine the molecular shape using the VSEPR theory. For example, if there are two bonding electron pairs and no non-bonding electron pairs, the molecular shape would be linear. If there are three bonding electron pairs and one non-bonding electron pair, the molecular shape would be trigonal pyramidal.
Without knowing the specific molecule, we cannot provide a direct answer to the molecular shape. It would be helpful to provide the specific molecule in order to determine its molecular shape.
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The molecule SF6 has a central sulfur atom (S) bonded to six fluorine atoms (F). To determine its molecular shape, we can use the valence shell electron pair repulsion (VSEPR) theory.
In SF6, the sulfur atom has six valence electrons, and each fluorine atom contributes one valence electron, giving a total of 48 valence electrons (6 electrons from sulfur and 6 electrons from each of the 6 fluorine atoms).
Based on VSEPR theory, the six electron pairs (lone pairs and bonding pairs) around the sulfur atom will arrange themselves to minimize repulsion and achieve maximum stability. Since there are no lone pairs on the sulfur atom in SF6, all six positions around sulfur are occupied by fluorine atoms.
As a result, the molecule SF6 adopts an octahedral molecular geometry. The six fluorine atoms are arranged symmetrically around the central sulfur atom, with the sulfur-fluorine bonds extending along the six edges of an octahedron. This means that the angle between any two adjacent fluorine atoms is 90 degrees, and all fluorine atoms are equidistant from the sulfur atom.
So, to summarize, the molecular shape of SF6 is octahedral, with the sulfur atom at the center and six fluorine atoms surrounding it in a symmetrical arrangement.
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Which wave is used to identify the heat given off by distant objects in space
Answers
Which one of the following statements is correct about the reaction below? Mg(s) +2 HCl(aq) MgCl(s) + H2(g) A) Mg is the oxidizing agent because it is losing electrons. B) H is the reducing agent because it loses electrons. C) Cl is the reducing agent because it is an anion. D) H is the oxidizing agent because it gains electrons.
Answers
In the given reaction: Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g) The correct statement about the reaction is: B) H is the reducing agent because it loses electrons.
Let's break down the given reaction and analyze the oxidation and reduction processes involved.
The reaction is: Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g)
In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to produce magnesium chloride (MgCl) and hydrogen gas (H2).
To determine the oxidizing and reducing agents, we need to identify the species undergoing oxidation and reduction by looking at the changes in their oxidation states.
Oxidation involves an increase in oxidation state, while reduction involves a decrease in oxidation state.
Let's examine the oxidation states of the relevant elements:
Magnesium (Mg) in its elemental state has an oxidation state of 0.Hydrogen (H) in its elemental state has an oxidation state of 0.In hydrochloric acid (HCl), hydrogen (H) has an oxidation state of +1, and chlorine (Cl) has an oxidation state of -1.Now, let's analyze the reaction:
Mg(s) + 2 HCl(aq) → MgCl(s) + H2(g)
Magnesium (Mg) is being oxidized. Its oxidation state changes from 0 to +2 in MgCl. This indicates that magnesium is losing two electrons.Hydrogen (H) is being reduced. Its oxidation state changes from +1 in HCl to 0 in H2. This indicates that hydrogen is gaining one electron.Based on these observations, we can conclude the following:
Magnesium (Mg) is the reducing agent because it is losing electrons (undergoing oxidation).Hydrogen (H) is the oxidizing agent because it is gaining electrons (undergoing reduction).Therefore, the correct statement is:
B) H is the reducing agent because it loses electrons.
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Which of the following describes what a scientist does?
Answers
Answer:
people who discover new things fyi you dont have any answer choices on there
Explanation:
there are different type of scientist
Answer:
A scientist asks questions about the world.
Explanation: