5.30 g of Na2CO3 dissolved in 400.0 mL solution.
to find:the molarity
solution:[tex]mv = \frac{grams}{molar \: mass} [/tex]
[tex](x)(0.4000l) [/tex]
[tex] = 5.30g |105.988g \: {mol}^{ - 1} [/tex]
[tex] = 0.12501415m[/tex]
[tex] x = 0.125m[/tex]
therefore, the molarity of 5.30 g of Na2CO3 dissolved in 400.0 mL solution is 0.125m.
What is the pH of a solution formed when 100 ML of an acid with a pH of two is diluted 1 L with pure water
Answer: look down hope I helped
Explanation:
1) First convert to pOH as OH is the dissociating species in a base equilibrium.pH + pOH = 14 (at 25 C)pH=13, hence pOH = 1,Hence [OH] = 10^-1 Mdiluting by factor of 10 with pure water gives [OH] = 10^-2 MThe new pOH = 2, hence the new pH is 12In general, dilution (with pure water) by a factor of 10 moves the pH 1 unit in the direction of the pH of water (pH 7). i.e. it moves up for acids, down for bases.(At infinite dilution of either acids or bases, you’d have pure water - obvious when you think of it like that)
Why is it impossible to measure the standard reduction potential of a single half-reaction?.
wrwtx 2m2q/qre .3dqs. rqxq3
shape to quantity
At room temperature most of ionic compounds are: a) amorphous solids (b) crystalline solids c) liquids (d) gases(
The ionic compound are crystalline solids at room temperature
Explanation:
they are quite strong because they contain strong ionic bonds
At the room temperature, ionic compound will be crystalline solids.
What is Ionic compound?
Ionic compounds are made up of ions kept together by the attraction of oppositely charged ions. One of the most well-known ionic compound is common salt (NaCl). Molecular compounds are made up of separate molecules that are bonded together through electron sharing.
What is crystalline solid?The elements of a crystalline solid are grouped in a tightly packed microscopic structure, generating a crystal lattice that stretches in all directions.
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Which statement best explains why the virus that causes dog flu does not infect humans? In other words, why is this type of flu specific to dogs?
The dog flu virus does not often come into contact with human cells.
The replication cycle of dog flu virus is must slower inside a human cell.
The dog flu virus interacts specifically with receptors on the surface of dog cells.
The toxins produced by the dog flu virus are not toxic to human cells.
Answer:
I believe your answer is : The dog flu virus interacts specifically with receptors on the surface of dog cells.
Explanation:
I hope this helps you :)
Pls mark brainleist :P
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Tori
How does an indicator differentiate between an acid and base?
Changes solubility
Changes reactivity
Changes color
Changes size
Answer:
that is all I know sorry hope that may help you :)
Explanation:
Indicator is a substance which shows different colors in acidic and basic medium. Indicators can be natural (derived from natural sources) or artificial ( man-made) for example :
*Litmus is an indicator. Acid turns blue litmus into red while base turns red litmus into blue
* Turmeric solution does not show change in color (remains yellow) in acidic solution and turns red in basic solution.
At what pressure will 4.80 moles of fluorine gas have a volume of 60.0 liters and a temperature of 298 K?
The pressure of the given mol of fluorine as an ideal gas at the given temperature and volume is 1.96atm.
Ideal Gas LawThe Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.
It is expressed as;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given the data in the question;
Amount of fluorine gas n = 4.80molesVolume V = 60.0LTemperature T = 298KPressure P = ?To determine the pressure of the fluorine gas, we substitute our values into the expression above.
PV = nRT
P = nRT / V
P = ( 4.80mol × 0.08206Latm/molK × 298K ) / 60.0L
P = 117.378624Latm / 60.0L
P = 1.96atm
Therefore, the pressure of the given mol of fluorine as an ideal gas at the given temperature and volume is 1.96atm.
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The letters Cu, C, and Ca are all chemicals for elements
True or false
Answer:
true
Explanation:
cu is copper, c carbon, ca calcium
Theoretical yield: 35.0g
Actual yield: 27.7g
What is the percent yield?
Answer:
Percentage yield=79.14%
Explanation:
Percentage yield=(Actual yield/theoretical yield)*100
Percentage yield=27.7g/35.0g*100
Percentage yield=79.14%
Why does Buckminsterfullerene, with a formula of C60, have a simple covalent structure instead of a giant covalent structure?
Answer:
HOPE THIS HELPS
Explanation:
They are made up of large molecules so are not classed as giant covalent networks . Weak intermolecular forces exist between buckyballs. These need little energy to overcome, so substances consisting of buckyballs are slippery and have lower melting points than graphite or diamond .
is a condition characterized by an overactive thyroid gland.
A. Acromegaly
B. Dwarfism
C. Diabetes insipidus
D. A goiter
What is the difference between metoprolol tartrate and metoprolol succinate.
Answer:
Metoprolol tartrate is the immediate-release version of metoprolol while metoprolol succinate is the extended-release version
Explanation:
This means that metoprolol succinate is released over time in the body leading to longer-acting effects. Metoprolol tartrate may need to be taken multiple times per day.
For an ideal gas, which pairs of variables are inversely proportional to each other (if all other variables are held constant)?
1. V and T
2. n and V
3. T and n
4. P and T
i am 9 and i'm at 3th grade
When does evaporation take place?
A.when water is cooled
B.when water is heated
C.when water is frozen
D.when water is filtered
Its in science im grade 4
What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20°C to 35°C?
Answer: 4707 J
Explanation:
Where does the energy generated by hydroelectric dams come from?
• A. Earth's internal heat
B. Fossil fuels
C. Flowing water
D. Fission reactions
Answer:
The answer would be C. Flowing water is where you get energy from hydroelectric dams.
Which answer best describes what is happening in the following redox reaction? 4fe 3o2 right arrow. 2fe2o3 this is combustion. this is neutralization. iron is oxidized to form rust. oxygen is oxidized to form rust.
The answer that best describes what is happening in the redox reaction 4Fe + 3O2 -> 2Fe2O3 is Iron is oxidized to form rust.
How is Iron is oxidized to form rust?Rusting is known to be a form o oxidation reaction. An iron is known to often reacts together with the elements of water and oxygen to bring about hydrated iron(III) oxide ( rust).
Conclusively, Always note that an Iron and steel rust is formed when these elements are said to come into any form of contact with water and oxygen as as thus rusting takes place just as seen in the redox reaction above.
See full question below
Which answer best describes what is happening in the following redox reaction?
4Fe + 3O2 -> 2Fe2O3
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Answer:
c
Explanation:
what is the total ionic and net ionic equation for for the reaction between between mercury (II) nitrate and iron (III) chloride.
Answer:
Hg+2 + 2Cl- -> HgCl2
HOPE THIS HELPS HAVE A GREAT DAY/NIGHT!!~
Explanation:
What is the role of conservation of momentum to your safety either as pedestrians or as motorist?
The role of conservation of linear momentum is important to your safety as a pedestrian or a motorist because you will avoid being hit by car.
Conservation of linear momentumThe principle of conservation of linear momentum states that the sum of the initial momentum of an isolated system is equal to the sum of the final momentum.
The role of conservation of linear momentum is important to your safety as a pedestrian or a motorist because you will avoid being hit by car which is in motion, knowing that impulse you will receive will be equal to the change in the momentum of the car.
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I need help in this question pleaaaaase!
The correct definition of oxidation in terms of oxygen, electron and hydrogen is added, lost , lost, (Row B).
What is an oxidation reaction?An oxidation reaction is a reaction in which the oxidation number if the reacting species increases in a positive direction.
Oxidation can be defined in terms of oxygen as the addition of oxygen. Oxidation can be defined in terms of electron as removal of electron Oxidation can be defined in terms of hydrogen as removal of hydrogen.Therefore, the correct definition of oxidation in terms of oxygen, electron and hydrogen is added, lost , lost, (Row B).
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What form of energy is produced by a stream of charged particles?
The flow of charged particles is called electricity. The flow of electrons around a circuit is called electric current.
hope it helps...!!!
acides and basis
50 points,s
only smart people can answer
Answer:
this is not the full question
[tex]\\ \rm\Rrightarrow pH=-log[H^+][/tex]
[tex]\\ \rm\Rrightarrow pH=-log[2.5\times 10^{-6}][/tex]
[tex]\\ \rm\Rrightarrow pH=-log2.5-log10^{-6}[/tex]
[tex]\\ \rm\Rrightarrow pH=-0.398+6[/tex]
[tex]\\ \rm\Rrightarrow pH=5.602[/tex]
Acidic as pH<7Gregor Mendel's work helped to
support the ____.
Answer:
I believe the answer is C.
Explanation:
He studied cell division.
37L of carbon dioxide decomposes. what mass of carbon results?
PLEASE HELP <3
The mass of carbon that resulted from the decomposition of 37 L of carbon dioxide is 19.8 g
Balanced equationCO₂ —> C + O₂
From the balanced equation above,
1 L of CO₂ decomposed to produce 1 L of C.
Therefore,
37 L of CO₂ will also decompose to produce 37 L of C
How to determine mass of CarbonAt standard temperature and pressure (STP),
22.4 L = 1 mole of C
Therefore,
37 L = 37 / 22.4
37 L = 1.65 mole of C
Thus, the mass of Carbon can be obtained as follow:
Mole of C = 1.65 mole Molar mass of C = 12 g/mol Mass of C =?Mass = mole × molar mass
Mass of C = 1.65 × 12
Mass of C = 19.8 g
Thus, 19.8 g of carbon were obtained from the reaction.
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While transferring naoh solution to the ph paper, you accidentally splash it onto your skin. check all actions you should take. tell your teacher right away. try to save the naoh for recycling purposes. neutralize by applying a small amount of acid (e.g., hcl). wipe the naoh with a paper towel and continue the experiment. rinse the exposed skin with water.
When NaOH solution is accidentally spilled on your skin while trying to transfer it into a pH paper, one should rinse the exposed skin with water.
How to deal with laboratory accidents?Chemical reagents can be found in the laboratory and are harmful to the human skin.
However, when transferring an alkaline solution of NaOH to the pH paper and one accidentally splashes it onto the skin, water should be poured to the affected part immediately.
The water washes away the chemical before it starts to have negative effect on the skin.
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Answer:
A) Tell your teacher right away
E) Rinse the exposed skin with water
Explanation:
edge 2022 <3
Which type of chemical reaction occurs in ca cl2 right arrow. cacl2? synthesis combustion single replacement double replacement
The type of chemical reaction occurs when calcium and chloride reacts to form calcium chloride is synthesis reaction.
What is synthesis reaction?Synthesis reaction is also known by the name of combination reaction in which two reactants combine for the formation of the product.
Given chemical reaction is also a synthesis reaction as in that calcium and chloride reacts with each other for the formation of calcium chloride as:
Ca + Cl₂ → CaCl₂
Combustion reaction are those in which carbon dioxide and water is produced, but in given reaction that is not happening so that was not combustion reaction.In replacement reaction one atom of any reactant will replace by another atom, but this is not the case in given reaction.In double replacemnt two atoms or molecules will replace, so given reaction is not that.Hence given chemical reaction is a synthesis reaction.
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Answer:
B, synthesis
Explanation:
Edge 2022
Which balances the equation mg o2 → mgo? mg 2o2 → 4mgo 2mg 2o2 → 2mgo 2mg o2 → 2mgo 2mg 2o2 → 4mgo
The equation which balances the given chemical reaction between magnesium and oxygen is 2Mg + O₂ → 2MgO.
What is balanced equation?Balanced equations are those equations in which each entities present in reactant side as well as on product side is equal.
Given chemical reaction:
Mg + O₂ → MgO
Above reaction is not balanced as number of oxygens are not equal on both sides.
Mg + 2O₂ → 4MgOThis is not a balanced equation as number of magnesium atom is not equal.
2Mg + 2O₂ → 2MgOThis is also not a balanced equation as oxygen atoms are not equal on both sides.
2Mg + O₂ → 2MgOThis is a balanced equation as number of each atoms are equal on both sides.
2Mg + 2O₂ → 4MgOThis is not a balanced equation as number of magnesium atom is not equal.
Hence balanced equation is 2Mg + O₂ → 2MgO.
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Calculate the number of grams needed to make 250 mL of 0.150 M NaOH.
For solving such problems we need to know mole concept,
Here, Volume and Concentration is given so it's so easy to find number of moles. first we have to convert volume from ml to litre and and then multiply by the concentration of NaOH:
★ Volume of NaOH = 250ml = 250 × 10⁻³ = 0.25L
★ Concentration of NaOH = 0.15 mol/L
Now, let's find the number of moles:-
Number of moles = volume × concentration
Number of moles = 0.25*0.15
Number of moles = 0.0375 mol/L
Thereafter, we have to find molar weight of NaOH and for this we have to know atomic mass of these elements:-
Na = 22g
O = 16g
H = 2g
Substitute the value
Molar weight of NaOH = 22+16+2
= 40 g/mol
Mass of NaOH = no. of moles × molar weight
= 0.0375*40
= 1.5 g/mol
Hence, We need 1.5 g /mol to make NaOH.
A gas has a temperature of 56.5°C. What is the temperature in K?
Answer:
329.65 K
Explanation:
56.5°C + 273.15 K= 329.65 K.
Hope this helps, good luck!
For a research project on time management, Yuri needs to calculate how many hours the average high school student spends in school each year. Which of these dimensional analysis equations is the correct one for him to use?
Answer:
7 hours……….5 days……….36 weeks
————- X ————— X ———————
1 day…………..1 week…………..1 year
how many hours per year does a high school student spend in school?
1260 hours per year
Explanation:
Answer:
7 hours...............5 school days.......36 school weeks
-------------------X-----------------------X---------------------------
1 school day......1 school week.......1 school weeks
1,260 hours per week
Explanation:
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Increasing the concentration of a reactant shifts the position of chemical equilibrium towards formation of more products. What effect does adding a reactant have on the rates of the forward and reverse reactions?.
Answer:
A.There is no effect on the forward and reverse reactions. For an equilibrium reaction, the forward and reverse rates are always equal.
B. Both the forward and reverse reactions speed up by the same amount.
C. The forward reaction speeds up immediately. As more product is made, the reverse reaction starts to speed up as the forward reaction starts to slow down until they are equal.
D. The forward reaction slows down initially. As the reaction proceeds, the reverse reaction slows down to meet the new forward reaction.
E. The forward reaction speeds up. Eventually, production of the product speeds up the reverse reaction rate to match the new forward rate.
F. It is impossible to say without more specific information.
Explanation: