Answer:
5.83 g
Explanation:
First, you must start with a balanced equation so you can see the mole ratios.
NaOH + H₃BO₃ --> NaBO₂ + 2H₂O
You can see that it takes 1 mole of sodium hydroxide to form 1 mole of sodium borate. 1:1 ratio
Now you must calculate how many moles of NaOH 35.47 g equals.
Na = 22.99 amu
O = 15.99 amu
H = 1.008 amu
NaOH = 39.997 amu
35.47 g ÷ 39.997 amu = 0.08868 moles of NaOH
Since it's a 1:1 ratio, the same number of moles of NaBO₂ is created. Now you must convert moles to grams.
Na = 22.9 amu
B = 10.81 amu
2 O = 31.998 amu
NaBO₂ = 65.798 amu
0.08868 moles x 65.798 = 5.83 g
When calcium metal is placed in water a vigorous single replacement rection occurs, releasing hydrogen gas. What will happen to the pH of the solution that forms as this chemical reaction proceeds
Answer:
The pH of the solution increases
Explanation:
One of the properties of metals is that they react with water to yield hydrogen gas and the hydroxide of the metal.
Calcium is a metal in group two of the periodic table and also undergoes such reaction.
The equation of the reaction is;
Ca(s) + 2H2O(l) -----> Ca(OH)2(aq) + H2(g)
Since Ca(OH)2 is alkaline, the pH of the solution increases.
30. A5.30 g of Na2CO3 is dissolved in a 400.0 mL solution. What is the molarity for this solution?
A. 0.0133 M
B. 0.0500 M
C. 0.125 M
D. 13.3 M
What is the volume of NaOH used in each Titration??
Answer:
Titration 1=33.9ml
Titration 2=33.45ml
Titration 3=33.35ml
Explanation:
Volume of NaOH used =Final reading - Initial reading
Titration 1:
Final reading =35.5ml
Initial reading=0.6ml
Volume of NaOH used =34.5ml -0.6ml=33.9ml
Titration 2:
Final reading =34.3ml
Initial reading=0.85ml
Volume of NaOH used =34.3ml -0.85ml=33.45ml
Titration 3:
Final reading =33.8ml
Initial reading=0.45ml
Volume of NaOH used =33.8ml 0.45ml=33.35ml
Hope it helps:)
A 2.0 mL sample of air in a syringe exerts a pressure of 1.02 atm at 22 C. If that syringe is placed into boiling water at 100 C and the pressure in the syringe increases to 1.27 atm, what is the new volume of the air in the syringe?
Answer: The new volume of the air in the syringe is 7.3 mL.
Explanation:
Given: [tex]V_{1}[/tex] = 2.0 mL, [tex]P_{1}[/tex] = 1.02 atm, [tex]T_{1} = 22^{o}C[/tex]
[tex]V_{2}[/tex] = ?, [tex]P_{2}[/tex] = 1.27 atm, [tex]T_{2} = 100^{o}C[/tex]
Formula used to calculate the new volume in syringe is as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{1.02 atm \times 2.0 mL}{22^{o}C} = \frac{1.27 atm \times V_{1}}{100^{o}C}\\V_{1} = 7.3 mL[/tex]
Thus, we can conclude that the new volume of the air in the syringe is 7.3 mL.
Identify the correct formula for each of the following acids. Click here to use the common polyatomic ion sheet if needed.
Hydrochloric acid
HClO2
HClO3
HCl
Answer:
HCl
H3PO4
Explanation:
The formula of hydrochloric acid is HCl. It contains one hydrogen and one chlorine atom. And thus all other options with O is wrong and option C is correct.
What is hydrochloric acid?
Hydrochloric acid is a strong acid having the formula HCl. Thus one mole of hydrochloric acid contains one hydrogen atom and one chlorine atom. No other elements such as oxygen is present in it.
The electronegativity of chlorine is very higher compared to hydrogen and they attracts by hydrogen bond. Each atom shares one electron with the other atom and thus it can also said as they are covalently bonded.
Hydrochloric acid is used in many industrial uses and it is present even in our stomach to aid digestion. Since it is very strong acid it may cause sever damages to skin if and its vapor causes respiratory issues when comes in contact.
Therefore, the correct formula of hydrochloric acid is HCl, option C is correct.
To find more about HCl, refer the link below:
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in which statement are the particles close together and slowly moving past each other
Answer
A-air
B-ice
C-steam
D-water
Answer:
Water particles are close together and move slowly past each other
Can someone help me with this?
How many grams of AlCl3 are needed to completely react with 2.25 of NaOH?
Answer:
omg my friends name is Noah
Explanation:
please look at the attached photo
How many joules of heat is needed to heat 68.00 grams of aluminum foil from 55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C? 2871 J 9058 J 2326 J 3420 J
Answer:
2326 J
Explanation:
93-55
You get the temperature increased.
Then the answer (x)
Mass *(x) *specific heat
PLEASE HELP DUE IN 20 MINUTES NO LINKS PLEASE
Answer:
A
Explanation:
Electrolysis has to do with the decomposition of a solution by the passage of direct current through it. Current enters and leaves the electrolyte via electrodes.
The positive electrode is called the anode while the negative electrode is called the cathode. Positive ions move towards the cathode while negative ions move towards the anode.
Cu^2+ moves towards the cathode and accepts two electrons to be deposited on the cathode as metallic copper. Also, Cl^- ions move towards the anode and gives up electrons to become oxidized to chlorine gas.
Hence in the electrolysis of CuCl2, copper is obtained at the cathode while chlorine gas is obtained at the anode. Hence 1 and 3 are correct statements.
HI! I REALLY NEED HELP, THANK YOU!!
Answer:
Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles. The difference in mass between the reactants and products is manifested as either the release or the absorption of energy.
Explanation: Read this and you might be able to figure it out for yourself ☺️☺️☺️
What is the mass of oxygen in 1 mole of NaHCO3?
Answer:
48.00
Explanation:
3 oxygen (15.99 x 3)= 48
1 mole of hydrochloric acid reacts with 1 mole of sodium hydroxide to give _______ g of sodium chloride.
Answer:
58,5
Explanation:
Sound is created through vibrations in the air which causes the auditory sensation in your ear – making you able to hear the noises that we do. Sound produced by different sources have different characteristics like amplitude , wavelength and frequency. Analyze the diagrams to answer the following questions with suitable reasons. (A)Which represents the highest pitched sound?. Give reason.
Answer:
The answer is A
Explanation:
A had higher frequency and higher the frequency of an object the higher its pitch still be
Is this an alpha or beta decay?
Suggest a substance that can be used to neutralise sulfuric acid.
answer this please
Sodium Carbonate, Sodium Bicarbonate or Sodium Hydroxide.
What volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide, all bromide ions in 35.0 mL of 0.064M of calcium bromide?
2AgNO3(aq) + CaBr2(aq) → 2AgBr(s) + Ca(NO3)2(aq)
a
3.04 mL
b
10.8 mL
c
21.6 mL
d
43.2 mL
Answer:
im pretty sure its d
Explanation:
The volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.
What is Molarity ?
Molarity is defined as the amount of solute (in moles)in per litre of solution.
It is also known as molar concentration of a solution , It is expressed in mol/l .
[tex]\rm M=\dfrac{n}{V}[/tex]
where n is the number of moles
and V is the volume in litres.
We can rearrange this equation to get the number of moles:
n= M * V
The molarity of calcium bromide is 0.064 M and the volume given is 35 ml,
the moles will be n = 0.064 * 35 = 2.24 moles
2AgNO₃(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)
From the reaction we can see that for every 1 mole of Calcium Bromide 2 moles of Silver Nitrate is needed , so for 2.24 moles 4.48 moles will be needed.
The molarity is given as 0.415 M and the number of moles is 4.48 so the volume required can be calculated from the above formula
[tex]\rm V=\rm\dfrac{n}{M} \\\\V=\rm\dfrac{4.48}{0.415} \\\\V= 10.8 ml\\[/tex]
Hence the volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.
To know more about Molarity
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LINO3 +
CaBr2 → ____ Ca(NO3)2 +
LiBr
Answer:
2LiNO3 + CaBr2 → Ca(NO3)2 + 2LiBr (balanced equation)
Answer:
2LiNO3 + CaBr2 → Ca(NO3)2 + 2LiBr
Explanation:
when chlorine gas is passed through potassium Bromide solution Potassium Chloride and bromine are formed which is a more reactive non metal bromine or chlorine
[tex] \boxed{\boxed{\huge{ \mathbf{ \underline{ Answer} \: \: ✓ }}}}[/tex]
In a displacement reaction, more reactive element displaces less reactive element from its compound and from the above reaction we observed that, Chlorine displaces bromine from its compound (KBr) to form Potassium chloride (KCl), therefore Chlorine is more reactive non - metal.
The equation for above reaction is :
[tex] \large\boxed {\mathrm{2KBr + Cl_2 \rightarrow 2KCl + Br_2}}[/tex]
_____________________________
[tex]\mathrm{ ☠ \: TeeNForeveR \:☠ }[/tex]
my chem test is tomorrow!! please help
Answer:
The pH of the pure water is not always neutral but actually sometimes it can be slightly acidic but not of the same extent or value as HCl obviously. However ,it is enough to result to a color change in the presence of phenolphthalein.
Explanation:
I will try to be brief and spare the boring details .Basically ,this is caused by the reaction of water and CO2 that is naturally present in the atmosphere to produce a weak acid known as carbonic acid.
~Hope this helps:)
What happens when the limiting reactant of a reaction runs out?
O excess reactants begin combining.
O reaction stops
O reaction slows down.
O reaction speeds up.
if 22.1g of CH4 reacts with 31.9g of O2 what is the limiting reactant?
timed test! will mark brainliest please help!!!
Answer:
CH4
Explanation:
because it CH4 have lesa mass than that of O2
definition of spirilla
don't write incorrect answer
Answer:
a bacterium with a rigid spiral structure,found in stagnant water and something causing disease
which type of star will have the longest lifespan
Answer:
Red dwarfs
Explanation:
Hope it helps!
Can the excess reactant control the percentage yield?
Please answer
Answer:
Yes, it can.
Explanation:
The percentage yield is decreased if the reactants do not completely form the products. To make a given mass of product, a process with a low percentage yield requires more of the reactants than a process with high percentage yield.
The half-life of iodine-131 is 8 days. How many milligrams of iodine-131
remain after 24 days if the original amount was 4.00 mg?
A. 1.33 mg
B. 0.667 mg
C. 0.500 mg
D. 0.444 mg
Answer:
The correct answer is - C. 0.500 mg.
Explanation:
In this case, the half-life of the iodine-131 is 8 days and the initial amount is given 4 mg. According to this after every 8 days, half of the initial value of the iodine-131 remains only.
8 days or 1st half-life = A(i)* 1/2
16 days or two half-life = A(i)* 1/4
24 days or three half-life = A(i)* 1/8
and the remaining amount A would be
= A(i)*1/2^n
= 4 * 1/2^3
= 4 *1/8
= 0.500 mg
Guys pls HELP ME PLS I WOLL GIVE BRAINLIEST PLS
Select all examples that apply as a physical changes in properties (please help)
An electric current is produced when ______________________ move continuously batteries magnets electric charges wires
Answer:
electric charges.
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.
An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
conclusion on friendship
Explanation:
Conclusion. A good friendship is very difficult to come across. That is why we should appreciate this divine relationship that is based on understanding and feelings. ... A true friend is one of the most precious possessions that one can have in his life.Hope it's helpful for Yuh bro!!
Answer:
Friendship is, in many respects, a "comfortable" love relationship. Friendships involve as little or as much intimacy as the partners are inclined to express at any given time. Friends are not normally obligated to exchange benefits, but do so in ways that are often so natural as to be unwitting. The ties that bind them are by unfettered mutual consent. In spite of its being so comfortable, in fact because of it, friendship contributes in unique ways .