Answer:
Group 18
Explanation:
For the reaction 2 Al + 3 H2SO4⟶ 3 H2 + H2(SO4)3 how many grams of sulfuric acid, H2SO4, are needed to react completely with 53.7 g of aluminum, Al??
Answer:
292.4 g
Explanation:
2Al + 3H₂SO₄ → 3H₂ + Al₂(SO₄)₃First we convert 53.7 g of Al into moles, using its molar mass:
53.7 g ÷ 27 g/mol = 1.99 mol AlThen we convert Al moles into H₂SO₄ moles, using the stoichiometric coefficients:
1.99 mol Al * [tex]\frac{3molH_2SO_4}{2molAl}[/tex] = 2.98 mol H₂SO₄Finally we convert 2.98 moles of sulfuric acid into grams, using its molar mass:
2.98 mol H₂SO₄ * 98 g/mol = 292.4 gWhen a hydrochloric acid solution is combined with
a potassium hydroxide solution, an acid-base
reaction occurs. Write a balanced molecular equation for this reaction
Answer:
HCl(aq) + KOH(aq --> KCl(aq) + H₂O(l)
Explanation:
The earth’s crust is subdivided into
A. Lithosphere, hydrosphere and atmosphere.
B. Troposphere, stratosphere and ionosphere.
C. Core, mantle and atmosphere.
D. Hydrosphere, geosphere and stratosphere.
Answer:
c. core, mantle and atmosphere
Answer:
Correct answer is letter A
Because Lithosphere includes the crust and the uppermost mantle.
5. 1.250 g of an alloy which is 90.00 % Ag and 10.00 % Cu is reacted with nitric acid producing AgNO3 and Cu(NO3)2 dissolved in solution. To the solution of the nitrate compounds is added a piece of copper wire that reacts only with the AgNO3 in solution to precipitate all of the silver, and produce additional Cu(NO3)2 (aq) . (The equation for this single-replacement reaction is: AgNO3(aq) + Cu(s) Cu(NO3)2(aq) + 2 Ag(s) ) The resulting solution containing all of the Cu(NO3)2 produced by the above processes is treated with excess zinc to precipitate the entire amount of copper (ll) ion present. ( The equation for this step is Cu(NO3)2(aq) + Zn(s) Zn(NO3)2(aq) + Cu(s) ) What mass of copper will be precipitated?
Answer:
See explanation
Explanation:
According to the question Copper is obtained from the original alloy and the copper wire used to displace the silver.
So,
Mass of the copper from the original alloy: (10.00 % * 1.250 g) = 0.125 g
We now need to obtain the mass of the copper from the wire, then we consider how much silver is precipitated:
Mass of silver in the alloy; 90.00 % * 1.250 g = 1.125 g
So,
Amount of silver precipitated =
1.125 / 107.9 = 0.01043 mole
From the reaction equation, it takes two moles of silver to displace one mole of copper.
Hence, the amount of copper from the wire is: 0.01043 / 2 = 0.005213 mol
And a mass of 0.005213(63.55) = 0.3313 g
Total mass of copper= 0.125 + 0.3313 = 0.456 g
6.
List two possible hazards that occur when clients/family members smoke near oxygen.
Describe two actions the PSW could take to avoid these hazards in the workplace and
ensure their safety as well as the client's. (4 Marks)
Hazard one
Hazard two
Actions
uses of carbon dioxide.
Answer:
hello can you follow me
Explanation:
used in fire extinction, blasting rubber, foaming rubber and plastic
the eye is connected to the brain by nerves.
A. True
B. False
the answer is A..which is true
What occurs in photosynthesis reaction
Answer and Explanation:
Photosynthesis reaction involves two reactants, carbon dioxide and water. These two reactants yield two products, namely, oxygen and glucose.
What are the two most abundant chemicals in air?
Answer:
The most abundant chemical/gas is Nitrogen, which makes up about 78% and Oxygen at second place with approximately 21%
Answer:
Nitrogen and Oxygen because about 70% of air is nitrogen and around 20% of air is Oxygen.
Hope this helps!
Identify what the element is on the periodic table
what did scientists mix to make the savanna cat
What is the pH of a 0.00200 M HCl solution?
Answer:
pH value of HCL = 2.69897
Explanation:
Given:
Concentration of HCL = 0.002 M
Find:
pH value of HCL
Computation:
pH value of HCL = - log(Concentration of HCL)
pH value of HCL = - log(0.002)
pH value of HCL = 2.69897
You add 0.300 moles of an acid to enough water to get a total of 0.500 liters of solution. Your molar concentration is?
supposing on a hypothetical garden 43 identical trees contains a total of 19565 leaves. if each branch on a given tree consist of 35 leaves how many branches does each tree have?
Answer:
13 branches/tree
Explanation:
Step 1: Given data
Total number of trees (t): 43 treesTotal number of leaves (l): 19565 leavesNumber of leaves per branch (l/b): 35 leaves/branchStep 2: Calculate the total number of branches (b)
We will use the following expression.
b = l × b/l
b = 19565 leaves × 1 branch/35 leaves = 559 branch
Step 3: Calculate the number of branches per tree (b/t)
We will divide the total number of branches by the total number of trees.
559 branches/43 trees = 13 branches/tree
12.0 grams of sodium reacts with 5.00 grams of chlorine. What mass of sodium chloride could be produced?
Please show work if you can. I have the limiting reactant which is Cl2 (0.0705)
I think I did this part correctly but I don't know what to do after. How do you determine the amount of sodium chloride that can be produced?
Answer❣
The required speech is as follows :
_______________
"Whoever controls media, controls mind". A very hearty Good Morning to one and all present here ! Respected Principal Sir, worthy teachers and all my dear fellow mates. Today I Aurora, of class XYZ is standing before you in this frizzy winter to deliver a short speech on the topic 'How media influences public opinion'.
Dear friends, first of all I would like to ask you all a question, 'What do you think is our media for ?' Most of us will reply that they are for our entertainment, fun and even unfortunately some will reply 'for movies and Bollywood'. Now if we look back at our history during 18th century we see that even first newspapers were started for spreading information in mass. Earlier literacy rate of India was very low.
A single person used to first read the newspaper and then shared the information to the gathered people around. But that time was different. Now nearly every person has a mobile phone, TV, PC and what not. Has this increased public participation in Democracy ? Yes indeed it has done that. On one single click we get information of our surrounding at a faster pace. As a fourth pillar of Democracy it makes our mindful of different social, political and financial exercises around us.
If we take current situation, most of the election popularisation works in different states is being managed by mass media only due to its advancements. Media makes participation of people in political activities even at grass - root levels. This efficiency enhances the Federalism of India. Media has many roles in shaping public opinion in our society. Let's discuss them one by one. In economic terms, media shows the expenditure, budgets and taxes to the citizens of a nation.
It makes people aware of the different types of money related issues that they have to face. Even it checks that no people are harassed by fake news on balances. Its makes people rise over their concern directly to the government so that actions can be taken for them. In social terms, media promotes the functioning of the government. It helps people to convey their social problems to the government. Even many NGOs and Human Rights Organizations take help of medias to make people aware of their rights.
Commonly Media acts as an inference or better to say 'compass' which gives direction to the views of people. It organises the vast multitudes of opinions into a single issue which can be beneficial to all the groups of society. It works 24 × 7 and makes people get in touch with latest developments. As 'Opposition' in Politics, media acts as a hub where the opposition party by taking views of public claims the wrong decisions of Ruling Party.
Also, during elections media shows mirror about different parties to people so that we can make right decision in voting. All these were some positive aspects of media's influence on public opinions. Now let's discuss about some negative aspects also. Nowadays its a common seen trend that media enlarges a short issue just to gain popularity. This results in riots, violence, protests, etc. because the issue which could have been solved by a single subtle discussion, now has been made a larger issue.
Let me present an example. I have a friend, Cupicake. She remains quite much familiar with medias. Some days ago, she received a post which asked her to share the image attached with it to her other friends. That image was of a case where Police was beating a few groups of people. She has shared that. This led a immediate violence in that region and finally it was known that Police was beating a few robbers. Now who to put blame of that riot ? Of course we are the one who done it.
At last I would like to conclude my speech by just saying that, it is the duty of media to transfer right and reliable information to people and its duty of people to share and trust upon right information from a good source. In this way the world and the nation would be leaded to right path.
Thank you one and all.
_______________
★ More to know :-
Format of Speech :
*Note - Here I used name as Aurora. You can use any according to your choice and class also according to the situation.
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hope that u r helpful
please follow thank and brinlylist please
Thank You...♡♡
Which the following classes of compound is an example of acarbonyl compound
Answer:
b) carboxylic acid
Explanation:
a first order reaction has a rate constant of 0.00318 min-1. the half life of this reaction is therefore
A first order reaction has a rate constant of 0.00318 min^-1. The half-life of this reaction is therefore 94.7 min
if 3.0 L of a gas at 20.0 degrees Celsius is heated to 30.0 degrees celsius what is the new volume of gas?
Explanation:
hece ,, it is your answer you can see
The new volume with raised temperature can be find out using Charles's law. When the temperature of the gas is raised to 20 to 30 degree celsius, the volume will increase from 3 L to 4.5 L.
What is Charles's law?Charles law states that at constant pressure, the volume and temperature of a gas are in direct proportion.
Hence V/T = a constant.
Let V1 and T1 bet the initial volume and temperature and V2 and T2 be the final volume and temperature respectively. Then we can write it as:
[tex]\rm \frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
It is given that the initial volume and temperature of the gas are 3 L at 20 degree Celsius. The final temperature is 30 degree celsius then the final volume can be calculated as :
V2 = V1 T2/ T1
= (3 L × 20 °C) / 30 °C
= 4.5 L.
Hence, the final volume of the gas is 4.5 L.
To find more on Charles law, refer here:
https://brainly.com/question/16927784
#SPJ2
102.5 MHz (typical frequency for FM radio broadcasting) in joules
Answer:
6.80×10¯²⁶ J
Explanation:
From the question given above, the following data were obtained:
Frequency (f) = 102.5 MHz
Energy (E) =?
Next, we shall convert 102.5 MHz to Hz. This can be obtained as follow:
1 MHz = 10⁶ Hz
Therefore,
102.5 MHz = 102.5 MHz × 10⁶ Hz / 1 MHz
102.5 MHz = 1.025×10⁸ Hz
Finally, we shall determine the energy. This can be obtained as follow:
Frequency (f) = 1.025×10⁸ Hz
Planck's constant (h) = 6.63×10¯³⁴ Js
Energy (E) =?
E = hf
E = 1.025×10⁸ × 6.63×10¯³⁴
E = 6.80×10¯²⁶ J
Pick the answer that correctly spells a layer of the atmosphere.
A. Mesosphere
B. Thermsphere
C. Mezosphere
D. Tropshere
E. Thermoshere
The correct answer is option A; Mesosphere
The mesosphere is defined as the part atmosphere found above the stratosphere but below the thermosphere.
In this layer of the atmosphere, temperature decreases with height. It covers about 50 to 85 km above the earth.
Mesosphere is the only layer of the atmosphere that was correctly spelt among the options.
Learn more: https://brainly.com/question/12117482
In a Sodium ion 11Na +1
atomic number =11
mass number =23 ,
the number of electrons =
Answer:
11 electrons
Explanation:
The number of electrons is the same as the number of protona in a ATOM.
They will most likely be different in a ion, simple bond or a convalent bond.
Question
In Woodward's 1952 synthesis of cholesterol, an elimination reaction was used to remove the C20 alcohol
substituent as shown below. The transformation is performed with acetic acid (hint: as opposed to a strong
base). Would you classify this as an E1 or E2 elimination?
Ola.E2
O b, E1
An element cannot be broken down into other substances by chemical or physical means. But you can still split a sample of an element into smaller pieces. For example, a piece of aluminum foil can be cut in half and then in half again, and all of the pieces will still be aluminum.What do you think will eventually happen if you could continue dividing that piece of aluminum foil
You will reach the smallest possible piece of the aluminum.
You will divide the aluminum into two smaller elements.
You will continue dividing the aluminum forever into smaller and smaller pieces.
You will reach a point at which there is no matter left.
Answer:
You will reach the smallest possible piece of the aluminum.
Explanation:
You will not be able to physically separate the aluminum into two smaller elements; aluminum is already a pure elemental substance. It will not divide forever, at some point it will be as small as you can possibly make it. However, you won't be able to erase the matter completely -- it will just become very very small!
A sample of aluminum, which has a specific heat capacity of 0.897·J·g−1°C^−1 , is put into a calorimeter (see sketch at right) that contains 300.0g of water. The aluminum sample starts off at 94.5°C and the temperature of the water starts off at 21.0°C .When the temperature of the water stops changing it's 23.8°C .The pressure remains constant at 1atm .Calculate the mass of the aluminum sample.
Answer: The mass of aluminium sample is 55.4 gram
Explanation:
[tex]Q_{absorbed}=Q_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
[tex]m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)][/tex]
where,
[tex]m_1[/tex] = mass of aluminium = ?
[tex]m_2[/tex] = mass of water = 300.0 g
[tex]T_{final}[/tex] = final temperature = [tex]23.8^0C[/tex]
[tex]T_1[/tex] = temperature of aluminium = [tex]94.5^oC[/tex]
[tex]T_2[/tex] = temperature of water = [tex]21.0^oC[/tex]
[tex]c_1[/tex] = specific heat of aluminium = [tex]0.897J/g^0C[/tex]
[tex]c_2[/tex] = specific heat of water = [tex]4.184J/g^0C[/tex]
Now put all the given values in equation (1), we get
[tex]-[m_1\times c_1\times (T_{final}-T_1)]=[m_2\times c_2\times (T_{final}-T_2)][/tex]
[tex]-[m_1\times 0.897\times (23.8-94.5)^0C]=[300.0g\times 4.184\times (23.8-21.0)][/tex]
[tex]m_1=55.4g[/tex]
Therefore, the mass of aluminium sample is 55.4 gram
Write balanced complete ionic equation for
CaS(aq) + CaCl2 (aq) –> CdS(s) + CaCl2 (aq).
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
Ca²⁺(aq) + S²⁺(aq) + Cd²⁺(aq) + 2Cl¯(aq) —> CdS (s) + Ca²⁺(aq) + 2Cl¯(aq)
Explanation:
CaS (aq) + CdCl₂ (aq) –> CdS (s) + CaCl₂ (aq)
The complete ionic equation for the above reaction can be obtained as illustrated below:
In solution:
CaS (aq) —> Ca²⁺(aq) + S²⁺(aq)
CdCl₂ (aq) —> Cd²⁺(aq) + 2Cl¯(aq)
CaS (aq) + CdCl₂ (aq) –>
Ca²⁺(aq) + S²⁺(aq) + Cd²⁺(aq) + 2Cl¯(aq) —> CdS (s) + Ca²⁺(aq) + 2Cl¯(aq)
4 NH3 +5 02 +4NO + 6H2O
When 70.25 grams of NH3 react, how many moles of H20 are produced?
Answer:
6.19 mol H₂O
Explanation:
4 NH₃ + 5O₂ → 4NO + 6H₂OFirst, we convert 70.25 grams of NH₃ into moles, using its molar mass:
70.25 g ÷ 17 g/mol = 4.13 mol NH₃Then we convert 4.13 moles of NH₃ into moles of H₂O, using the stoichiometric coefficients of the balanced reaction:
4.13 mol NH₃ * [tex]\frac{6molH_2O}{4molNH_3}[/tex] = 6.19 mol H₂OWhat is the hydrogen ion concentration in molarity if the hydroxide ion concentration is 7.609 10-13 ?
[H+][OH-] = 10-14
pH = -log[H+]
[H] = 10pH
Answer: The hydrogen ion concentration in molarity is 0.013
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pOH is calculated by taking negative logarithm of hydroxide ion concentration and pH is calculated by taking negative logarithm of hydrogen ion concentration
Putting in the values:
[tex]pOH=-\log[7.609\times 10^{-13}][/tex]
[tex]pOH=12.1[/tex]
Now , [tex]pH+pOH=14[/tex]
[tex]pH=14-12.1=1.9[/tex]
[tex]pH=-\log [H^+][/tex]
[tex][H^+]=0.013M[/tex]
The hydrogen ion concentration in molarity is 0.013
How many grams of MgCl2 would be needed to make 5.3 liters of a 0.25 molar solution? Round your answer to the nearest 0.01,
Answer: 126.1 grams of are needed to make 5.3 L of 0.25 M solution
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
To calculate the mass of solute for given molarity, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{given mass of solute}}{\text {Molar mass of solute}\times \text{Volume of solution in L}}[/tex]
[tex]0.25M=\frac{x}{95.2g/mol\times 5.3L}[/tex]
[tex]x=126.1g[/tex]
Thus 126.1 grams of are needed to make 5.3 L of 0.25 M solution
4. How many moles of Cl2, are obtained by the
decomposition of 6.3 moles of POCI3?
Answer:
6.3moles
Explanation:
The balanced chemical equation for the decomposition of phosphorus oxychloride (POCl3) is as follows:
POCl3 → POCl + Cl2
Based on the above decomposition reaction, it shows that;
1 mol of POCl3 will decompose to give 1 mole of Cl2
Hence, 6.3 moles of POCI3 will give 6.3 moles of Cl2.
If 154.9 grams of KOH exactly neutralizes 262 mL of an aqueous HCl solution, what is the concentration of the HCl solution
Answer:
10.5M HCl
Explanation:
Using the chemical reaction:
KOH + HCl → H₂O + KCl
Where 1 mol of KOH reacts per mole of HCl
We can solve this problem converting the mass of KOH to moles using its molar mass. The moles of KOH added are equal to moles of HCl in the solution. That is:
Moles KOH = Moles HCl
154.9g KOH * (1mol / 56.1g) = 2.761 moles
The molarity of the solution (Moles HCl per liter of solution) is:
2.761moles HCl / 0.262L =
10.5M HCl