Answer:
[tex]Ca^{2+}(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3 (s)[/tex]
Explanation:
Hello.
In this case, we can first write the complete molecular equation as shown below:
[tex]CaBr_2(aq)+Na_2CO_3\rightarrow CaCO_3 (s) +2NaBr(aq)[/tex]
In such a way, since all the species but calcium carbonate remain in aqueous solution, they are successfully dissociated whereas the solid product remain undissociated:
[tex]Ca^{2+}(aq)+2Br^-(aq)+2Na^+(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3 (s) +2Na^+(aq)+2Br^-(aq)[/tex]
Thus, we can cancel out bromide and sodium ions as spectator ions, in order to obtain the required net ionic equation:
[tex]Ca^{2+}(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3 (s)[/tex]
Best regards!
How many protons, neutrons and electrons are there in the species
26 Si+4?
Which of these is an example of physical weathering?
A. Blowing away of lighter rock particles
B. Rock breaking up to due to mechanical force
C. Rock breaking up due to carbonic acid
D. Settling down of tick particles in a new location
Answer:
c
Explanation:
c
What creates gas pressure in a container such as a helium balloon?
A the vacuum maintained in the container
B atmospheric pressure acting on the outside walls of the container
C the simultaneous collisions of fast-moving particles with the container
D the attractive forces between gas particles inside the container
Answer:
C the simultaneous collisions of fast-moving particles with the container
Explanation:
Neutrons have a mass of __________ unit and a charge of __________.
Answer: 1 unit, charge of 0.
Explanation: Neutrons have a charge of 0 because they are neutral. Both protons and neutrons have a mass of 1 Amy.
What product is formed when each compound is treated with either LiAlH4 (followed by H2O), or NaBH4 in CH3OH
The missing diagrams are shown in the diagrams attached below.
Answer:
Explanation:
The reaction of Lithium Aluminium hydride LiAlH4 with Alkanone leads to the formation of secondary alcohol products. This is because Lithium Aluminium hydride LiAlH4 acts as a reducing agent. The reaction of NaBH4 in CH3OH with Alkanone is less reactive as compared with Lithium Aluminium hydride LiAlH4, thus it also reduces aldehydes and ketones. From the image attached below, we will see the missing diagram and the mechanism used in the process for the formation of those products.
An ion formed from an atom has a 1- charge. The number of electrons present in the ion is 36 and the number of neutrons is 46. Identify the element by typing the name. For example: Hydrogen or Sodium.
Answer:
I believe the answer is Krypton.
Explanation:
I think it's krypton because usually, the number of electrons gives you the number of protons which can be used to find the atomic number.
Hope that helps!
What is a photon?
what is a photon?
-a wavelength of energy having amplitude and frequency
-a mixture of different elements in a metal
-a packet of light energy emitted from a light source
-a magnet used to deflect electrons away from traveling in a straight path
The combustion of liquid octane C8H18, in the presence of gaseous oxygent yields carbon dioxide and liquid water. In determining how many moles of water are produced by the reaction of 1.50 moles of octane, which conversion factor should be used?
Answer:
The answer to your question is given below.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below below:
2C8H18 + 25O2 —> 16CO2 + 18H2O
From the balanced equation above,
2 moles C8H18 reacted to produce 18 moles of H2O.
Finally, we shall determine the number of moles of H2O produced by the reaction of 1.5 moles of C8H18. This can be obtained as follow:
From the balanced equation above,
2 moles C8H18 reacted to produce 18 moles of H2O.
Therefore, 1.5 moles of C8H18 will react to produce = (1.5 × 18)/2 = 13.5 moles of H2O.
Thus, 13.5 moles of H2O were obtained from the reaction.
A certain species of frog comes in two different colors, green and brown. A population of these frogs live in and along a river. In 1980, a very large drought occurred, causing most of the river to dry up. Most of the plant life around the river died as well.
Why did the green frog population decrease after the drought
dont do the sample response but ill give out a brain thing if ur right
Answer:
The green frog's population decreases because they cannot blend as easily into the mostly brown environment of the dry river bed as their brown counter parts. There are not as many green plants for them to hide against, making it easier for predators to see them.
Explanation:
The green frog's population decreases because they cannot blend as easily into the mostly brown environment of the dry river bed as their brown counter parts. There are not as many green plants for them to hide against, making it easier for predators to see them.
What is the solution of the inequality shown
below?
a-3 > 5
Answer:
a>8
Explanation:
Hoped that helped!
Answer:
[tex]a > 8[/tex]
Explanation:
If we take a look at this problem, we can see that we need to solve for a.
[tex]a - 3 > 5[/tex]
Just like solving a normal equation, we can take add 3 on both sides like so:
[tex]a - 3 > 5\\ +3 +3\\----\\a > 8[/tex]
As our final answer, we get [tex]a[/tex] is greater than 8!
Hoped this helped!
-Bob Ross
please help!!!! chemistry question
Answer:
protons-50
Neutrons-75
protons are 50, neutrons are 75
An atom of calcium becomes a cation when it forms an ionic bond with two atoms of chlorine. What is the charge on the calcium ion?
A. 1+
B. 2+
C. 3+
D. 4+
Answer:
2+
Explanation:
I just did this question.
What is the pH at the equivalence point of a weak acid, strong base titration if 25.0 mL of formic acid requires 29.80 mL of 0.1567 M NaOH. Ka for formic acid is 1.8 x 10-4.
Answer:
pH = 8.34
Explanation:
Formic acid reacts with a strong base producing formate ion, HCOO⁻, the equilibrium is:
Kb = [HCOOH] [OH⁻] / [HCOO⁻]
Where Kb is basic equilibrium constant = Kw / Ka = 1x10⁻¹⁴ / 1.8x10⁻⁴ = 5.56x10⁻¹¹
[HCOOH] and [OH⁻] comes both from formate ion, that means [OH⁻] = [HCOOH] = X, our incognite
And [HCOO⁻] is molarity of the solution. We need to determine this:
Moles of formate = Moles of NaOH added until equivalence point:
29.80mL = 0.02980L * (0.1567mol / L) = 4.670x10⁻³ moles NaOH = Moles Formate
And total volume of the solution is:
29.80mL + 25mL = 54.8mL = 0.0548L. Molarity is:
4.670x10⁻³ moles / 0.0548L = 0.08522M
Replacing in Kb expression:
Kb = [HCOOH] [OH⁻] / [HCOO⁻]
5.56x10⁻¹¹ = [X] [X] / [0.08522M]
4.738x10⁻¹² = X²
X = [OH⁻] = 2.177x10⁻⁶M
pOH = -log [OH⁻] = 5.66
And pH = 14 - pOH is:
pH = 8.34We dissolve 345 g of calcium acetate in enough water to make 1.2 L of solution. What is the osmotic pressure of this solution at 54 ∘C? Express your answer in atm.Î
Answer:
[tex]\Pi=146.3atm[/tex]
Explanation:
Hello.
In this case, since the osmotic pressure is computed via:
[tex]\Pi =i*c*RT[/tex]
Whereas the van't Hoff's factor of calcium acetate (molar mass = 158.17 g/mol) is 3 as it dissociates in one calcium ion and two acetate ions, the concentration is:
[tex]c=\frac{345g*\frac{1mol}{158.17g} }{1.2L}=1.82mol[/tex]
Therefore, the osmotic pressure is:
[tex]\Pi =3*1.82mol*0.082\frac{atm*L}{mol*K}*(54+273.15)K\\\\\Pi=146.3atm[/tex]
Best regards!
I am giving brainlyest to whoever answers the question. I need help with the conclusion and table one.
conclusion questions:
Write a conclusion statement that addresses the following questions:
• Explain how you determined the polarity of all your compounds by first predicting the polarity of water, and then mixing different solutes and solvents to find the polarities of the other substances.
• Which of your polarity and solubility predictions were correct?
table questions are in the photo
Answer:
Alikes dissolve. Polar substances dissolve in polar solvents and nonpolar substances dissolve in nonpolar solvents. So how they reacted showed us whether or not they were polar or nonpolar. Such as water and vinegar. They are both polar molecules so they were polar.
3. What factor (s) affect the potential energy?
Answer:
The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in.
Explanation:
How many atom in 5 moles of nitrogen?
Answer:
To start, you need know that all a mole means is you have 6.022 x 1023 atoms of that type. So if I tell you I have a mole of nitrogen, then I have 6.022 x1023 nitrogen atoms. That ugly number is called Avogadro's Constant, NA
Explanation:
hy its isnt the correct answer but checkout the equation hope it help help
Which event most likely occurs at point K?
cooling
cementing
melting
weathering
Answer:Melting
Explanation:
It was right when i took the test
A rock must be heated to between 600 and 1,300 degrees Celsius (1,100 and 2,400 degrees Fahrenheit) in order to melt and become molten rock. At point K the event occurring is melting.
The lithosphere of the Earth, also referred to as the crust, is a solid layer of the globe where rocks melt. Between 50 and 200 kilometers beneath the surface, rocks dissolve on average.
The rock will melt under excessive heat or pressure and turn into lava. Instead of metamorphic rock, an igneous rock will emerge as a result of this. An igneous rock called granite is created when magma cools slowly underneath.
Thus the correct option is C.
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If the 50 kg object slows down to velocity of 1 m\s how much Kinect energy dose it have
Is the Statue of Liberty changing color from copper to teal a physical change?
Answer:
No its a chemical Change
Explanation:
Answer: chemical change
Explanation: Copper turns green because of chemical reactions with the elements. ... Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.
An 80 proof brandy is 40.0 % (v/v) ethyl alcohol. The "proof" is twice the percent concentration of alcohol in the beverage. How many milliliters of alcohol are present in 790 mL of brandy?
Answer:
Answer : The volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.
Explanation :
As we are given that 40.0 % (v/v) alcohol solution. That means, 40.0 mL of alcohol present in 100 mL of solution.
Now we have to calculable the volume of alcohol in 675 mL solution.
As 100 mL of solution contains 40.0 mL of alcohol
So, 675 mL of solution contains alcohol
Thus, the volume of alcohol = 270 mL
Now we have to calculate the volume of water.
The volume of water = Volume of the solution - Volume of alcohol
Volume of water = 675 mL - 270 mL
The volume of water = 405 mL
Thus, the volume of water = 405 mL
Hence, the volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.
790 mL of an 80 proof brandy, which is 40.0 % (v/v) ethyl alcohol, contain 316 mL of ethyl alcohol.
An 80 proof brandy is 40.0 % (v/v) ethyl alcohol, that is, there are 40.0 mL of ethyl alcohol per 100 mL of brandy. This is the conversion factor.
We have 790 mL of brandy. This is the given information.
The milliliters of ethyl alcohol in 790 mL of brandy are:
[tex]790 mL Brandy \times \frac{40.0mLAlcohol}{100mLBrandy} = 316mLAlcohol[/tex]
790 mL of an 80 proof brandy, which is 40.0 % (v/v) ethyl alcohol, contain 316 mL of ethyl alcohol.
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If 30.8 grams of hydrobromic acid react to form 0.4 grams of hydrogen, how many grams of bromine must simultaneously be formed
Answer:
30.4g of Br2
Explanation:
2HBr --> H2 + Br2
From the stochiometry of the reaction;
2 mol of HBr reacts to form 1 mol of Br2
Mass of HBr = Molar mass * Mol = 80.91 * 2 = 161.82g
Mass of Br2 = Molar mass * Mol = 159.8 * 1 = 159.8g
161.82g of HBr forms 159.8g of Br2
30. 8g would the form x?
161.82 = 159.8
30.8 = x
x = 30.8 * 159.8 / 161.82 = 30.4g of Br2
If a solution is 3% H2O2 by mass calculate its molarity. Assume the density is 1 g/mL. How does this molarity compare with the molarity of H2O2?
Answer:
0.882M of H2O2
Explanation:
A 3% solution by mass of H2O2 is a solution 3g of H2O2 in 100g of solution.
We need to convert the grams of solution to liters and the grams of H2O2 to moles to find molarity:
Moles H2O2:
3g H2O2 * (1mol / 34.01g) = 0.0882 moles H2O2.
Liters of solution:
100g solution * (1mL / 1g) * (1L / 1000mL) = 0.100L
Molarity (Ratio of moles of solute and liters of solution is:
0.0882 moles / L = 0.882M of H2O2
Compare the planets Mars and Saturn. Describe how their common characteristics are similar.
the planets Mars and Saturn
Answer: Mars and Saturn both have celestial body. Mars and Saturn both revolve around the sun in their own orbits. Mars is the second smallest in the solar system while Saturn is second largest in the solar system.
(Just to clarify and correct the other person who answered....they both do not have rings. Saturns does, but Mars does not.)
Explanation:
3. Identities of the components in a mixture may be determined by a technique called spiking. Suppose you had run a gas chromatogram on your product and had then deliberately added a drop of a known sample of 3-methylcyclohexene to a drop of your product. What would you expect the new chromatogram to show you?
Answer:
Explanation:
Suppose we dehydrate 2-methylcyclohexanol, the products formed are 1-methylcyclohexene and 3 methylcyclohexene, where 1-methylcyclohexene tends to be the major product because it has the tendency of more substituted double bond.
In any event, gas chromatography method usually reveals two products with their relative amounts but not their identities.
Now, if we carry out a reaction containing those two products and let's say we have a peak 10:1. Then, we add a little drop of 3-methylcyclohexene to the mixture and carry out the test again.
Let's say that the new ratio is 3:1. Therefore, we can conclude that the minor product is 3-methylcyclohexene. However, if the ratio is larger, let say 20:1, then the original sample's major product is 3-methylcyclohexene.
We expect new chromatogram to show the major quantity of one of the formed products.
What is gas chromatography?Gas chromatography is a kind of analytical method in the chemistry to separate and analyze the components of any compound by the adsorption process.
When we already run our product on the gas chromatogram and after the result we add a drop of 3-methylcyclohexene in the product then we don't observe much difference in the result. Because from the gas chromatography result we only get the quantity of any substance not the identity. If already in the product 3-methylcyclohexene was present then in that condition we get a higher peak in graph and identify the component of product.
Hence, 3-methylcyclohexene gives idea about the quantity.
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this is a method used to separated parts of a mixture. large and small particles are separated using a screen
Answer:
Screening
Explanation:
Screening is usually done in large amounts.
Thanks!!
Vitamin C was measured by an electrochemical method in a 50.0-mL sample of lemon juice. A detector signal of 2.02 mA was observed. A standard addition of 1.00 mL of 29.4 mM vitamin C increased the signal to 3.79 mA. Find the concentration (in mM units) of vitamin C in the juice.
Answer:
The concentration (in mM units) of vitamin C in the juice is 0.64mM.
Explanation:
Let us calculate -:
Concentration of sample =>[tex]1ml\times 29.4mM[/tex]
= 29.4 mmol => 29.4mmol/50ml
= 0.588mM
plug in formula =>[tex]\frac{[final concentration]}{[v_1/v_2]} \times[final concentration]+[concentration of sample])[/tex] or
[tex]\frac{[x]}{[v_1/v-2]} \times[ x]+[concentration of sample])[/tex]
= [2.02 micro-Amber/3.79micro-Amber]
plug in and simplify
1.81x = 1.17
x = 0.64mM
Hence , the answer is 0.64mM.
8. When you know both the speed and direction of an object's motion, you know the
a. average speed of the object.
b. acceleration of the object.
c. distance the object has traveled.
d. velocity of the object.
what would a sunrise be like on Venus?
Answer:
But it is likley that sunsets and sunrises would be a lot slower due to Venus having a slow spin rate and the Sun being brighter due to Venus being closer to the Sun than Earth. Brightness: As noted above Venusian sunsets and sunrises would be a lot brighter and a lot more brilliant than on Earth due to Venus being closer to the Sun.
Explanation:
How does de-icing roads with salt negatively impact the environment?
a. The road salt attracts deer that are then hit by motor vehicles.
b. It removes necessary salt from the local water courses.
C. The high salinity of the surface runoff is harmful to freshwater ecosystems.
d. The salt harbors salt eating bacteria that are toxic to animals
Answer:
c.
The high salinity of the surface runoff is harmful to freshwater ecosystems.
Explanation: cause that's the answer
The negative impact of deicing roads with salt on the environment is the high salinity of the surface runoff is harmful to freshwater ecosystems. Therefore, option (C) is correct.
What is deicing?Deicing can be described as the process of removing snow, ice, or frost from a surface. The application of chemicals that not only deice but also remain on a surface to delay the reformation of ice for a certain period of time.
Deicing is accomplished by mechanical methods through the application of heat, various salts or brines, alcohols, glycols, or by a combination of these different techniques.
Deicing of roads has been done with salt, often mixed with sand and gravel, on slick roads. Sodium chloride is generally used, as it is inexpensive and can be available in large quantities.
Since salt water still freezes at −18 °C and also has a tendency to cause corrosion, rusting the steel used in most vehicles. It can be toxic to some plants and animals depending on the concentration of salt.
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