5. What is the temperature -34°C expressed in kelvins?
A. 207 K
B. 339 K
C. 239
D. 139 K
Answer:
C. 239
Explanation:
-34 + 273.15 = 239.15
The equation to convert celsius into kelvin is C = K - 273.15
how many electrons were transferred if the total charge of a process is 919.4 C
The number of electrons transferred of the process is 5746.25×[tex]10^{18}[/tex]e.
Explanation:
The electron is known as the subatomic particle which revolves around the nucleus by possessing the negative charge. when the atoms are involved in the reaction or process these electrons are transferred are gained by the atoms. Coulomb is the term used to express the charge of the electrons. In normal 1 coulomb of charge possess 6.25× [tex]10^{18}[/tex] electrons. So here the total charge of the process is 919.4c in order to find number of electrons transferred is found by the product of 919.4 × 6.25× = 5746.25 × [tex]10^{18}[/tex].Thus the number of electrons transferred is obtained. the transferred electrons are 5746.25 ×[tex]10^{18}[/tex].The number of electrons that were transferred is 5.746 × 10²¹
From the question,
We are to determine the number of electrons that were transferred.
Using the formula
Q = ne
Where
Q is the total charge
n is the number of electrons
and e is the charge of 1 electron (e = 1.6 × 10⁻¹⁹ C)
From the given information
Q = 919.4 C
Putting this into the formula, we get
919.4 = n × 1.6 × 10⁻¹⁹
∴ n = 919.4 ÷ (1.6 × 10⁻¹⁹)
n = 5.746 × 10²¹
Hence, the number of electrons that were transferred is 5.746 × 10²¹
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The major ways people are exposed to toxins are by ingesting them, inhaling them, injecting
them, or absorbing them through the skin.
It is true that the major ways people are exposed to toxins are by ingesting them, inhaling them, injecting them, or absorbing them through the skin.
Explanation:
Toxins can enter in four various ways into our body often referred as "route of exposure". It is one among many factors affecting toxicity.
Inhalation: When the toxin is a gas, it is usually absorbed into the body by inhalation. Inhalation of toxins may cause respiratory and lung damage. Eg: cigarette smoke
Absorption: If a toxin enters the human eye or skin, it can be absorbed into the bloodstream. This is called absorption. The skin can prevent some toxins from entering the body. For example: work stations (gas stations) where people work with toxins
Ingestion means that the person has ingested the toxin. Some chemicals cannot get into blood from digestive tract. For example: drinking contaminated water.
The injected toxin enters the body when the person carrying the toxin breaks the skin. Injections can end in veins, muscles or just under the skin. Eg: Botulinum (used to get rid of wrinkles)
In bio-chemistry, poison, a natural or synthetic substance that damages living tissue and has a harmful or lethal effect on the body, regardless of whether it is absorbed, inhaled or injected through the skin.
How many grams of Chromium Chloride III are needed to produce 75.0 of Silver Chloride?
CrCl3 + AgNO3 --> Cr(NO3) +AgCL
Answer: 27.61g
Explanation:
First thing first, generate a balanced equation for the reaction as illustrated below:
CrCl3 + 3AgNO3 —> Cr(NO3)3 + 3AgCl
Next, we'll find the molar mass of CrCl3 and AgCl:
Molar Mass of CrCl3 = 52 + (3x35.5)
= 158.5g/mol
Molar Mass of AgCl = 108 + 35.5 = 143.5g/mol
But from the balanced equation, 3 mol of AgCl was produced. Therefore, the mass conc. of AgCl from the equation = 3 x 143.5 = 430.5g.
From the equation,
158.5g of CrCl3 produced 430.5g of AgCl.
Therefore, Xg of CrCl3 will produce 75g of AgCl i.e
Xg of CrCl3 = (158.5x75) / 430.5 =27.61g.
So, 27.61g of CrCl3 will produce 75g of AgCl
Final answer:
The problem requires balancing the chemical equation and performing stoichiometry calculations to find how many grams of CrCl₃ are required to produce 75.0 grams of AgCl. Additionally, the use of Ksp allows for the prediction of precipitation conditions in solutions.
Explanation:
The student's question involves a stoichiometry calculation and the solubility product concept, both of which are key topics in chemistry. To find the grams of Chromium Chloride III (CrCl₃) needed to produce 75.0 grams of Silver Chloride (AgCl), one needs to follow these steps:
Balance the chemical equation, although the provided equation lacks coefficients and products for Chromium Nitrate. Assuming it's Cr(NO₃)₃, it should be balanced as CrCl₃ + 3AgNO₃ -> Cr(NO₃)₃ + 3AgCl.Calculate the molar mass of AgCl and CrCl₃.Use stoichiometry to convert from grams of AgCl to moles, then use the mole ratio from the balanced equation to find moles of CrCl₃ needed.Finally, multiply the moles of CrCl₃ by its molar mass to find the grams required.As for the solubility product (Ksp) questions, they are based on the solubility equilibrium and precipitation. For instance, the Ksp for silver chloride (AgCl) is calculated using the concentration of silver ions [Ag⁺] and chloride ions [Cl⁻] in the solution at equilibrium. If given the Ksp and one ion concentration, you can determine the concentration at which precipitation occurs by rearranging the Ksp expression.
How many molecules are in 1.25 mil of oxygen dichlorvos, OCL2?
Answer:
7.52 × 10²³ Molecules of OCl₂
Explanation:
As we know one mole of any substance contains 6.022 × 10²³ particles (atoms, ions, molecules or formula units). This number is also called as Avogadro's Number.
The relation between Moles, Number of Particles and Avogadro's Number is given as,
Number of Particles = Moles × 6.022 × 10²³
In given statement the particles are the molecules of Oxygen dichloride OCl₂ Hence,
Putting values,
Molecules of OCl₂ = 1.25 mol × 6.022 × 10²³ Molecules/mol
Molecules of OCl₂ = 7.52 × 10²³ Molecules
What words can you spell isotherm periodic table
Answer: ?????????????????????
Explanation:
1gallon=3.79 liters, The gas tank of a car holds 15 gallons.if you were traveling in Europe how many liters if petrol would you need to fill the tank?
If a metal changes color over time from exposure to air, what has likely occurred?
a) a chemical change
b) a reversible change
c) a change of state
d) a physical change
Answer:
Option A. a chemical change
Explanation:
A chemical change is a change in which new substance is formed and can not be easily reversed. A change of metal color when exposed to air for a long time is simply called rusting. This is a chemical change as new substance is formed. This can be seen when Zn roofing sheets changes color over time on exposure to air.
Which process releases the most heat?
- the condensation of 10 g of gaseous water
- the melting of 10 g of ice
- the freezing of 10 g of liquid water
- the boiling of 10 g of liquid water
Answer:
the boiling of 10g of liquid water
Answer:
The correct option is "the condensation of 10 g of gaseous water"
Explanation:
In condensation,gaseous stats is changes into liquid. So it will release more energy to convert from one state to another state.So it is exothermic process in which heat is released.
What are 3 ways Venus is more like earth than any other planet
Answer: they’re the almost the same size almost the same mass and made up of the same materials
Explanation:
A gas occupies 97 mL at 130 kPa. Find its volume at 225 kPa You must show all of your work to receive credit. Also, name the gas law you used to solve the problem. 1 point- Identify which of the Gas Laws you used to solve the problem. 3 points- Show your work on solving the problem. (4 points)
Boyle's law is used to solve this problem.
The Volume occupied is 56 mL.
Explanation:
As per the Boyle's law, Pressure and volume are inversely proportional to each other, when mass and temperature remains constant or the product of the volume and pressure remains constant.
PV = C
P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
= 130 × 97 / 225
= 56 mL
what is matter made of?
Answer: Positively charged protons, neutral neutrons, and negatively charged electrons.
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When a match is lit, sulfur (S8) reacts with oxygen to release energy and form sulfur dioxide, SO2. Write the balanced equation for this reaction.
Answer: S8 + 8O2 => 8SO2
Explanation: The equation is now balanced. Both Sulfur have 8 atoms in the reactant and product side. Oxygen have 16 atoms on each side.
What is the answer to 4x - 16
Answer:-64
Explanation:
Consider the following successive ionization energies of an unknown element (X) in period five of the main group elements (5a). IE1 579 IE2 1814 IE3 3740 IE4 12479 IE5 14840. What is the identity of the unknown X?
Antimony
Explanation:
The element with this ionization energies is antimony, Sb.
This is because the element has 5 ionization energies.
IE1 579
IE2 1814
IE3 3740
IE4 12479
IE5 14840
Ionization energy is the amount of energy required for the removal of an electron in an atom.
Each shell in an atom have their own respective ionization energies that increases as we penetrate into the atom.
An atom with 5 ionization energies suggests that it has 5 shells. Only Antimony in group 5a has five shells because it belongs to the fifth period.learn more:
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What would happen of scientific knowledge was not debated and confirmed by scientist?
Answer: the world wouldn’t be the same today
Explanation:
Which of the following pressures is equal to 303,900 pa?
3.0 atm
303.9 atm
303,900 atm
3.00 mm Hg
Answer:
3.0 atm is correct
Explanation:
303,900 pa = 2.999259 atm
303,900 pa = 2279.4371 mmHg
Answer:3atm
Explanation:
101325 Pa = 1atm
303,900 Pa = 303,900/101325 = 3atm
What color do we see when all light is reflected?
Answer:
white
Explanation:
If only blue light is shone onto a red shirt, the shirt would appear black, because the blue would be absorbed and there would be no red light to be reflected. White objects appear white because they reflect all colors. Black objects absorb all colors so no light is reflected.
Answer:
White
Explanation:
Sterling silver is:
A) a heterogeneous mixture
B) colloid
C) an element
D) Homogeneous mixture
Answer:
It’s D
Explanation:
It’s an alloy so it is not pure. If you take a small sample and analyze it, the mixture will be similar throughout. Think of Gatorade as a homogeneous mixture because it is the same concentration of all ingredients throughout. Think of pizza for heterogeneous mixtures. There isn’t the pepperoni (or whatever you prefer) throughout.
Sterling silver is a homogeneous mixture, or a solution, because it is a combination of silver and other metals that are uniformly mixed together to create a consistent composition.
Explanation:Sterling silver is considered to be a homogeneous mixture, or a solution. A homogeneous mixture is a combination of two or more substances that are so intimately mixed that they behave as a single substance. In the case of sterling silver, it is a mixture of silver and other metals, such as copper, that are uniformly mixed together to create a uniform composition throughout.
A few minerals are common but most are
How does one determine the number of core electrons an atom has?
O
A. Subtract the atomic number from the atomic mass.
O
B. Subtract the group number from the atomic number.
O
C. Add the atomic number and the number of valence electrons.
O
D. Add the group number and the period number.
The one to determine the number of core electrons an atom has To subtract the group number from the atomic number. Therefore, option B is correct.
What is an atomic number ?The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number.
The number of protons in an atom is the atomic number. It is sometimes referred to as the proton number for this reason. The capital letter Z is used to represent it in calculations. The word zahl, which meaning number of numerals in German, is where the letter Z originates.
The atomic number, or number of protons, is displayed in the upper left. The element's letter sign appears in the centre.
Thus, option B is correct.
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How many electromagnetic forces exist?
a one
b. two
c.
d
three
four
Please select the best answer from the choices provided
Answer:
c
Explanation:
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Which feature forms at convergent
boundaries?
A mountain range
B trench
C rift valley
D mid-ocean ridge
Final answer:
Convergent boundaries can form both mountain ranges and trenches, but the specific feature formed depends on whether the boundary involves an oceanic plate or a continental plate.
Explanation:
At convergent boundaries, tectonic plates move toward each other. The type of feature that forms at convergent boundaries depends on the types of plates involved and their interactions. Here are the possible features associated with convergent boundaries:
A. Mountain Range: Formed when two continental plates collide, resulting in the uplift of crustal material and the creation of a mountainous region.
B. Trench: Formed when an oceanic plate collides with a continental plate, causing the denser oceanic plate to subduct beneath the continental plate. This leads to the formation of a deep ocean trench.
C. Rift Valley: This typically forms at divergent boundaries where tectonic plates move away from each other. It is not a typical feature of convergent boundaries.
D. Mid-Ocean Ridge: Formed at divergent boundaries where oceanic plates move apart, allowing magma to rise from the mantle and create a new oceanic crust. It is not a typical feature of convergent boundaries.
Convergent boundaries are zones where plates move together. When an ocean plate meets a continental plate, the heavier ocean plate is pushed beneath the continental plate, forming a trench. When two continental plates collide, they smash into each other, forming a large mountain range. Hence, the correct answer is A. mountain range.
What role can fire play in the life cycle of some gymnosperms? It can help cones open and release seeds. It can produce the sticky liquid to help capture pollen. It can allow seeds to develop faster into mature plants. It can prevent plants from releasing too much pollen.
Answer:
The correct answer is : It can help cones to open and release seeds.
Explanation:
Gymnosperms like Conifers and Pines grow in high altitudes under extreme weather conditions. Higher altitudes have severely cold climate accompanied with water mostly remaining in the ice form.This is the reason why the cones produced by these plants are too hard to be destroyed by the extremely harsh conditions.But during germination these cones need to open and release the seeds.The best natural way for this is by the means of fire which burn the outer harder layer of the cone and release the seeds.Answer:
The answer is A. It can help cones open and release seeds.
Explanation:) edge 2023 brainliest would be appreciated
Fill in the coefficients that will balance the following reaction:
a0NaC2H3O2 +
a1Fe2O3 →
a2Fe(C2H3O2)3 +
a3Na2O
Answer:
6,1,2,3
Explanation:
Hope this helped!
An antecedent is a word for which a pronoun is substituted to avoid repetition.
True
False
Explanation:
Antecedent means - prior, preceding, foregoing, previous, former.An antecedent is a word or a part of a sentence that is replaced by a pronoun which helps in repetition.An example of an antecedent is the word “Pankaj” in the sentence: “Pankaj loves his dog.”Another example is -
Khushi bit her lip.Khushi = antecedent; her = personal pronoun.
it is true
because it is true
Help with this?Show work please :)
Answer: 3.2778x10-10 moles Ca
Explanation: solution
1.974x10-¹⁴ atoms Ca x 1 mole Ca/ 6.022x10²³ atoms Ca
= 3.278x10-10 moles Ca
Tin oxide reacts with hydrogen to produce tin and water how many moles of SnO2 are needed to produce 500.0 g of Sn
Answer:
4.21 mol of SnO₂
Explanation:
The balance chemical equation for this single replacement reaction is as follow;
SnO₂ + 2 H₂ → Sn + 2 H₂O
Step 1: Calculate moles of Sn as:
Moles = Mass / A.Mass
Moles = 500 g / 118.71 g/mol
Moles = 4.21 moles
Step 2: Find out moles of SnO₂ as,
According to balance equation,
1 mole of Sn is produced by = 1 mole of SnO₂
So,
4.21 moles of Sn will be produced by = X moles of SnO₂
Solving for X,
X = 1 mol × 4.21 mol / 1 mol
X = 4.21 mol of SnO₂
PLEASE HELPP ______ consist of one large main root with smaller roots branching off, while _____ consist of several main roots that branch off to form one. mass of roots. Question 3 options: taproots; fibrous roots fibrous roots; taproots stems; leaves leaves; stems
Answer:
1st answer: Taproots
2nd answer: fibrous roots
Explanation:
What is the final step in the scientific method?
Answer:
Developing a Conclusion
Answer:
The conclusion
Explanation:
It states what the final results are and helps you double check if your hypothesis was correct.