Answer:
129.73 g of CaBr₂
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
CaBr₂ + 2KOH –> Ca(OH)₂ + 2KBr
Next, we shall determine the mass of CaBr₂ that reacted and the mass of Ca(OH)₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of CaBr₂ = 40 + (80×2)
= 40 + 160
= 200 g/mol
Mass of CaBr₂ from the balanced equation = 1 × 200 = 200 g
Molar mass of Ca(OH)₂ = 40 + 2(16 + 1)
= 40 + 2(17)
= 40 + 34
= 74 g/mol
Mass of Ca(OH)₂ from the balanced equation = 1 × 74 = 74 g
SUMMARY :
From the balanced equation above,
200 g of CaBr₂ reacted to produce 74 g of Ca(OH)₂.
Finally, we shall determine the mass of CaBr₂ that react when 48 g of Ca(OH)₂ were produced. This can be obtained as follow:
From the balanced equation above,
200 g of CaBr₂ reacted to produce 74 g of Ca(OH)₂.
Therefore, Xg of CaBr₂ will react to produce 48 g of Ca(OH)₂ i.e
Xg of CaBr₂ = (200 × 48)/74
Xg of CaBr₂ = 129.73 g
Thus, 129.73 g of CaBr₂ were consumed.
ipt While they have different functions in adults, the limb bones of several organisms all arise from the same
set of cells in the embryo's body. How does this evidence support the theory of evolution?
O A. It suggests there is a common ancestor between all of the organisms.
OB. It says that the cells randomly mutate in order to produce the limbs.
O c. It provides evidence that says that all organisms are actually the same as embryos.
OD. It tells scientists that evolution has caused the limbs to be different in the adult form.
Answer:
c
Explanation:
Answer:
Explanation:
[H+] [OH-] =
NEED HELP ASAP!!!
How many moles of CO 2 are there in a 50.0 dm sample of the gas at a pressure of 100.0 kPa and a temperature of 50.0°C?
a. 1.86 moles
b. 1.20 moles
c. 2.0 moles
d. 12.0 moles
Answer:
A
Explanation:
Hope this help you sweetie :)
The specific heat capacity of liquid water is 4.18 J/g oC. Calculate the quantity of energy required to heat 1.50 g of water from 26.5oC to 83.7oC. (Ignore significant figures for this problem.)
Answer: The quantity of heat required is 358.644 J.
Explanation:
Given: Specific heat capacity = [tex]4.18 J/g^{o}C[/tex]
Mass = 1.50 g
[tex]T_{1} = 26.5^{o}C[/tex]
[tex]T_{2} = 83.7^{o}C[/tex]
Formula used to calculate heat energy is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass
C = specific heat capacity
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times (T_{2} - T_{1})\\= 1.50 \times 4.18 J/g^{o}C \times (83.7 - 26.5)^{o}C\\= 358.644 J[/tex]
Thus, we can conclude that quantity of heat required is 358.644 J.
A sample of aluminum requires 341 J of energy to raise the temperature from 18.0ºC to 55.0ºC. Calculate the mass of the aluminum sample.
Answer:
10.22g
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where;
Q = amount of heat required (J)
m = mass of substance (g)
c = specific heat of substance (J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
Q = 341J
m = ?
∆T = 55.0ºC - 18.0ºC = 37°C
c of aluminum = 0.902J/g°C
Using Q = m × c × ∆T
341 = m × 0.902 × 37
341 = 33.374m
m = 341 ÷ 33.374
m = 10.22g
Examine the map of the United States. Tornadoes are most common in the Midwest and Great Plains states. According to the map, what causes the prevalence of tornadoes in these regions? A) Falling air currents form from the mixing of falling warm, moist air and the rising of cold air. B) Spinning air currents form from the mixing of rising warm, moist air and the falling of cold air. C) Spinning air currents form when cold, dry air becomes saturated with moisture and becomes unstable. Eliminate D) Rising air currents form from the deposition of cold air at the surface and moist air at the top of the troposphere.
Answer:
the answer is B-Spinning air currents form from the mixing of rising warm, moist air and the falling of cold air.
Explanation:
How many moles of chlorine are in 100g Chlorine (CI^2)?
A) 64.6
B) 100
C) 1.41
D) 0.355
Answer:
35.453 good luck with your work
Calculate the volume of solvent present in a 55.5%
by volume of 10.5 mL alcohol solution.
Answer:
I dont know
Explanation:
good luck
Robert Hooke observed a slice of cork under a microscope. He saw what looked like “pores” or “cells” in it. Hooke can assume that the cork is most likely - Answer F A man made material G A type of living organism H A type of mineral J A petroleum based product
The cork oak tree from which cork is extracted is native to southwest europe and northwest africa. Cork is extracted from cork oak trees without harming the tree. So cork is a type of mineral. The correct option is C.
What is a cork cell?The dead cells without having intercellular spaces are defined as the cork cells. They appear at the periphery of roots and stems when they grow older and increase in girth. They also have a chemical called suberin in their walls.
It is the suberin which makes them impervious to gases and water. The outer protective coat of a tree is called the cork. It is one of the components of bark of the tree. The tissues of bark become old and the secondary mersitem replaces them.
Cork is made up of multiple thick layers and it protects the tree from bacterial or fungal infection.
Thus the correct option is C.
To know more about Cork, visit;
https://brainly.com/question/29692488
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PLEASE HELP!! I'll give brainliest!! How are the different colors and designs generated in a firework?
I really need help
Explanation:
By using different chemcial reactions
Answer:
Color combinations are produced in the sky when various metal elements are heated, exciting electrons and releasing excess energy in the form of light. The color you see is determined by the chemicals that burn at different wavelengths of light in the spectrum. Higher energy compounds (e.g. copper chloride) emit colors like violet and blue and lower energy compounds (e.g. strontium chloride) emit colors like orange and red.
Explanation:
Please mark brainiest ✌
A solution has a concentration of 4.55x10^-2 H+ ions what is the pH
Answer:
1.34
Explanation:
PH can be calculated by taking the negative logarithm to the base ten of the hydrogen ion concentration
Which of the following metals will dissolve in ice water?
A. lead
B. sodium
C. zinc
D. nickel
Answer:
I think the answer would be sodium
Answer: B: Sodium
Explanation:
Sodium if one attempted to experiment this it will result in that sodium will react violently and be exothermic because that the evolve hydrogen immediately ignites fire (Also I'm sorry if this is all wrong and unhelpful)
i cant seem to figure out ANY of these... help when you can pls :.)
Nahco3+hc2h3o2=nac2h3o2+h2co3
The equation NaHco3+hc2h3o2=nac2h3o2+h2co3 is already balanced.
Reaction information:
Nahcolite + Acetic Acid = Sodium Acetate + Carbonic Acid
Reactants:
Nahcolite - NaHCO3 :
Molar Mass, Oxidation State
Acetic Acid - HC2H3O2
Molar Mass, Oxidation State, Ethanoic Acid, Methanecarboxylic Acid, Ch3-Cooh, Acetic Acid; Glacial, etc
(NaHCO3 + HC2H3O2 = NaC2H3O2 + H2CO3)
1. What are the five symbiotic relationships?
2. What is mutualism? Explain mutualism with an example and a picture.
3. What is commensalism? Explain with an example and a picture.
4. What is predation? Explain with an example and a picture.
5. What is parasitism? Explain with an example and a picture.
6. What is competition? Explain with an example and a picture.
Write a CER paragraph (5- 8 complete sentences) answering the following prompt:
Why are symbiotic relationships important in an ecosystem?
Answer:
1) There are five main symbiotic relationships: mutualism, commensalism, predation, parasitism, and competition.
2) The term mutualism can be simply defined as a relationship in which both species are mutually benefited. This relationship can either be within the species or between the two different species. ... Here ants are the mutualist and acacia trees is the host. The acacia tree provides home and food for the ants.
3) Commensalism is a type of symbiotic relationship in which one species benefits, while the other species is neither harmed nor helped. The species that gains the benefit is called the commensal. ... An example is a golden jackal (the commensal) following a tiger (the host) to feed on leftovers from its kills.
4) Predation is the interaction between organisms in which one organism known as the predator kills another organism which is known as prey. ... Examples of predation are a lion eating deer or a snake eating rats. This results in the transfer of energy from the prey to the predator.
5) Parasitism is generally defined as a relationship between the two living species in which one organism is benefitted at the expense of the other. The organism that is benefitted is called the parasite, while the one that is harmed is called the host. A few examples of parasites are tapeworms, fleas, and barnacles.
6) Competition is a negative interaction that occurs among organisms whenever two or more organisms require the same limited resource. ... For example, animals require food (such as other organisms) and water, whereas plants require soil nutrients (for example, nitrogen), light, and water.
Symbiotic relationships are important because they are a major driving force of evolution. This networking and cooperation among species allows them to survive better than they would as individuals.
Explain any three ways of protecting our water bodies
Answer:
Easy Things You Can Do To Protect Drinking Water Sources
Properly dispose of hazardous productsPut up signs. ...
Use and dispose of harmful materials properly. ...
Volunteer in your community. ...
Join in a beach, stream or wetland cleanup. ...
Prepare a presentation about your watershed for a school or civic organization. ...
Organize a storm drain stenciling project.
Explanation:
A 3.8 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.8 g. The two substances react, releasing carbon dioxide gas to the atmosphere. After the reaction, the contents of the reaction vessel weigh 11.6 g. What is the mass of carbon dioxide released during the reaction
Answer:
3.0 g
Explanation:
The total mass at the beginning of the reaction is:
3.8 g + 10.8 g = 14.6 gFollowing the law of conservation of mass, this same mass has to be present once the reaction is complete. This means that the mass diference between the contents of the reaction vessel after the reaction and the mass at the beginning of the reaction is the mass of released carbon dioxide:
14.6 g - 11.6 g = 3.0 gCan someone please solve this question?? Is an element in group 3 likely to bond with an element from group 2?? Explain using the number of balance electrons from each element and the tot number of balance electrons needed to fill an about shell
Answer:
An atom with one or two valence electrons more than a closed shell The number of valence electrons of an element can be determined Groups 3-12 (transition metals), 2* (The 4s shell is complete and cannot hold any more electrons) in explaining the molecular structure of many organic compounds.
Explanation:
Place a 400 ml beaker, half-filled with water, on a bot plate and let it reach boiling. Set the hot plate on low. Place a pinch clamp on the knot end of the balloon and place the balloon on the top of the beaker so that the pinch clamp sits inside the beaker but does not touch the water. What happens to the balloon after it has been on the beaker for 5 minutes? Explain your observation. Predict what would happen if you heated the balloon to an even higher temperature What do you think is happening on the microscopic scale (atomic level)? After heating the gas, did the density of the gas in the balloon change? Explain your answer Remove the balloon from the beaker and place it in an ice bath. Explain what happens.
Answer:
See Explanation
Explanation:
When the balloon is placed above the beaker as described and heating commences, the balloon inflates more. This increased inflation is due to the expansion of the gas in the balloon.
The gas expands because the molecules of gas inside the balloon receive a greater kinetic energy when the temperature was increased hence they move faster and spread out. Recall that temperature is defined as a measure of the average kinetic energy of the molecules in a body.
As the gas in the balloon is heated up, its density decreases. The more the beaker is heated the more the balloon becomes inflated.
When the balloon is removed from the beaker and placed in an ice bath, the balloon shrinks as temperature decreases. This is in conformity with Charles's law.
What is formed when a carboxylic acid and an amine combine? Give an example of the type of polymer that is formed by this reaction.
Answer:
The reaction between amines and carboxylic acids to form amides is biologically important. It is through this reaction that amino acids (molecules containing both amine and carboxylic acid substituents) link together in a polymer to form proteins.
Considere la combustión del monóxido de carbono (CO) en oxígeno gaseoso: 2CO(g) + O2(g) → 2CO2(g) Si la reacción se inicia con 3.60 moles de CO, calcule el número de moles de CO2 que se producen si hay suficiente oxígeno para reaccionar con todo el CO.
Answer:
3.60 moles de CO₂
Explanation:
2CO(g) + O₂(g) → 2CO₂(g)
Para convertir moles de CO en moles de CO₂ debemos usar un factor de conversión con los coeficientes estequiométricos de la reacción, dejando las moles de CO en el denominador y las moles de CO₂ en el numerador:
3.60 mol CO * [tex]\frac{2molCO_2}{2molCO}[/tex] = 3.60 moles CO₂8. In order to find molarity, you must know what two things? *
Answer: - The moles of solute present in the solution.
- The volume of solution (in liters) containing the solute.
Explanation:
Charge q is 1 unit of distance away from the source charge S. Charge p is two times further away. The force exerted
between S and q is the force exerted between S and p.
O 1/2
O 2 times
O 1/4
O 4 times
Answer:1/4
Explanation:
A Container with 8.0 mol of gas at a pressure of 2.0 atm has a volume of 7.00 L.
What is the temperature of the gas?
The temperature of the gas is (value1] K.
Answer:
dryhnjkftglqawghbnjsdfmkpohbgfddfvgb
Explanation:
given mass of nitrogen is 0.12 dm^3 at 60°C and 1.01*10^5 Nm^2. Find its pressure at the same temperature if its volume is changed to 0.24 dm^3
50500Nm^2 or 5.05Nm^2
Explanation:
so bring out the parameters
p1= 0.12dm3, T1= 60c , because temperature is in kelvin add 273= 333k, v1= 0.12dm3 , T2= to the same value because the temperature didn't change = 333k, v2= 0.24dm3,P2= ?
general gas equation p1v1 over T1 = P2V2 over T2, when you input everything or make p2 the subject of the formula first you'll get the answer, pressure can have an s.i unit of mmhg but I'm using the same si unit as the question given and always check your units in the question to convert. please if this question has options please check, I don't want you to fail so verify from others if I made a mistake
Which of the following would be considered an Exothermic Reaction?*
Ice Melting
Burning wood
Boiling water
Baking a cake
Answer:
Burning wood
Explanation:
the fire releases heat into the air from the burning wood
what is the mass spectrom
Answer:
Here's your Answer
Explanation:
the mass spectrum is the graphical representation of the ion abundance versus the mass to charge of the ions separated in mass spectrometer
1.. A saturatedsolutionA.contains more solute thansolvent.B.contains more solvent thansolute.C.contains equal moles of solute andsolvent.D.contains the maximum amount of solute that will dissolve in that solvent at that temperature.E.contains a solvent with only sigma bonds and no pi bonds (i.e. only single bonds, with no doubleor triplebonds).
Answer:
D. contains the maximum amount of solute that will dissolve in that solvent at that temperature.
Explanation:
Solubility is a term used to describe how readily a substance can be dissolved in a solvent to form a solution. Thus, a substance is said to be soluble if it dissolves completely in a solvent and insoluble if it doesn't dissolve or only dissolves partially.
For example, sodium chloride (NaCl) when mixed with water dissociates into sodium and chloride ions. Thus, salt (sodium chloride) is said to be soluble because it dissolves completely in water.
Hence, a compound that dissolves in water to produce an aqueous solution is said to be soluble in water. Also, the solute of an aqueous solution that conducts electricity is called an electrolyte.
In Chemistry, dissolution can be defined as the process of dissolving or dissociating a solute in solid, liquid or gaseous phase into fragmented particles by a solvent in order to form a solution. For dissolution to occur in solids, the crystalline structure of the substance must be broken up so as to release ions, atoms or molecules to produce a solution. For liquid and gases, the substance to be dissolved must form a non-covalent bond with the solvent to produce a solution.
Generally, a saturated solution contains the maximum amount of solute that will dissolve in that solvent at that temperature.
1. Which individuals are most likely to die before reproducing, those with adaptive traits or
nonadaptive traits? Why? (Hint: You may use the newt population as an example in your
explanation.)
Calculate the [H+] in a solution that has a pH or 5.21
Answer:
[H⁺] = 6.17×10¯⁶ M
Explanation:
From the question given above, the following data were obtained:
pH = 5.21
Concentration of Hydrogen ion [H⁺] =?
The pH of a solution is defined by the following equation:
pH = –Log [H⁺]
With the above formula, we can obtain the concentration of Hydrogen ion [H⁺] in the solution as follow:
pH = –Log [H⁺]
5.21 = –Log [H⁺]
Divide both side by –1
–5.21 = Log [H⁺]
Take the antilog of –5.21
[H⁺] = Antilog (–5.21)
[H⁺] = 6.17×10¯⁶ M
Therefore, the concentration of Hydrogen ion [H⁺] in the solution is 6.17×10¯⁶ M
