more reactive material can help to stop iron rusting true or false
Answer: Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water from reaching the metal underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object.
Explanation:
37.4 g of aluminum chloride reacts with bromine gas to yield aluminum bromide and chlorine gas. How many liters of bromine gas is needed to completely react with aluminum chloride? Assume both gases are at STP.
Answer:
9.43 L Br₂ (g)
Explanation:
First, write a balanced reaction equation. Then use dimensional analysis to convert from grams of aluminum chloride to moles of aluminum chloride (with molar mass from the periodic table), from moles of aluminum chloride to moles of bromine gas (using the balanced equation), and from moles of bromine gas to liters of bromine gas (remember at STP, 1 mol = 22.4 L). See the attached image for the work out. Finally, account for sig figs to get 9.43 L of bromine gas
calculate the mass of butane needed to produce 65.5 g of carbon dioxide
You take the mass of carbon dioxide, 56.8g, divide by its molar mass, 44.01g/mol, to produce the moles of carbon dioxide. This is multiplied by the molar ratio of butane/CO2, (2/8) = 1/4, which gives the moles of butane required to produce the carbon dioxide.
The mass of a substance is the product of the moles and the molar mass. 65.5 g of carbon dioxide will be able to produce 21.62 grams of butane.
What is mass?The mass of a reactant or a product is estimated by the number of moles and the molar mass of the substance.
The combustion reaction of methane is shown as,
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
Given,
Molar mass of butane = 58.12 g/mol
Mass of carbon dioxide = 65.5 g
Molar mass of carbon dioxide = 44.01 g/mole
Moles of carbon dioxide are calculated as,
Moles = mass ÷ molar mass
= 65.5 ÷ 44.01
= 1.488 moles
From the above reaction, two moles of butane produce eight moles of carbon dioxide. So, 1.488 moles of carbon dioxide will be produced from,
2 × 1.488 ÷ 8 = 0.372 moles
The moles of butane required is 0.372 moles
The mass of butane from moles is calculated as,
Mass = moles × molar mass
= 0.372 × 58.12 g/mole
= 21.62 gms
Therefore, 21.62 gm of butane is required to produce 65.5 g of carbon dioxide.
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i killed someone now what?? police are surrounding my house im hiding in my closet i don't know why im on this app but maybe i can get some help cause it isn't a joke
Hey can someone pls help me answer these questions? It should be easy maybe. It’s just science. The question just won’t to know where you would put the arrow above to show the motion of the plates. Where would I put it?
If 0.8675 g of KHP requires 24.56 mL of an NaOH solution to reach the equivalence
point in the titration, what is the concentration of the NaOH?
Answer:
[tex]M_{base}=0.173M[/tex]
Explanation:
Hello there!
In this case, since the titration of acids like KHP with bases like NaOH are performed in a 1:1 mole ratio, it is possible for us to know that their moles are the same at the equivalence point, and the concentration, volume and moles are related as follows:
[tex]n_{acid}=M_{base}V_{base}[/tex]
Thus, by solving for the volume of the base as NaOH, we obtain:
[tex]M_{base}=\frac{n_{acid}}{V_{base}} \\\\M_{base}=\frac{0.8675g*\frac{1mol}{204.22g} }{0.02456L} \\\\M_{base}=0.173M[/tex]
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How many grams of KCl will be formed from 0.500 grams of KClO3?
Answer:
0.31g KCl
Explanation:
Before we can start, we have to wonder, how many moles of KCl is formed from KClO3? To figure that out we have to make a balanced equation.
KClO3 -> KCl + O2
How do I know it makes O2? Looking back at the problem they're asking for KCl, which has less ions than KClO3 so it must have been broken down. So we can say it's a decomposition type of reaction. We can't just slap on O3, we know oxygen is one of our diatomic elements that usually exists as O2 so we'll put it down as O2 and balance our equation.
2KClO3 -> 2KCl + 3O2
Now that we know every 2 moles of KClO3 makes 2 moles of KCl, this is our mole to mole ratio. Knowing the ratio between the 2 compounds in our problem is the stepping stone from converting from grams KClO3 -> moles KClO3 -> moles KCl -> grams KCl.
1. Let's first convert grams KClO3 -> moles KClO3
[tex]0.500g KClO3 x \frac{1 mol}{123g KClO3} = 0.0041 mol KClO3[/tex]
2. Convert moles KClO3 -> moles of KCl using our mole to mole ratio
[tex]0.0041 mol KClO3 x \frac{2 mol KCl}{2 mol KClO3} = 0.0041 mols KCl[/tex]
3. Convert moles KCl -> grams KCl
[tex]0.0041 mol KCl x\frac{75g KCl}{1 mol} = 0.31g KCl[/tex]
When doing the experiment where you compress the air in the syringe, you are collecting 5 data points. Each time you are to decrease the volume by _____ mL
This question is incomplete, the missing diagram is uploaded along this question below.
Answer:
Each time you are to decrease the volume by 4 mL
Explanation:
From the image, we can see that the volumes of each syringes are displayed;
the first syringe reads 22
the second syringe reads 18
the third syringe reads 14
the fourth syringe reads 10
and the fifth syringe reads 6
Thus, if we notice the consecutive reading on the syringes, we will notice that each successive step reduces the volume by 4 mL
Therefore, Each time you are to decrease the volume by 4 mL
what is the difference between transmutation and natural radioactivity
Answer:
o diferença chave entre a radioatividade e a transmutação é que a radioatividade se refere à transmutação natural, enquanto a transmutação se refere à mudança de um elemento químico em outro por meios naturais ou artciais.Tanto a radioatividade quanto a transmutação são processos químicos que envolvem a mudança de núcleos atômicos para formar um novo elemento químico a partir de um elemento químico existente. A radioatividade é um tipo de processo de transmutação
Explanation:
mais informação em; ahttps://pt.strephonsays.com/radioactivity-and-transmutation-9500
how can CN carry negative charge
Answer:
Cyanide contains two atoms having carbon and nitrogen. Which are bonded through two two pi and one sigma bond by sharing of the electron . As a result one lonepair of electron remains in Cyanide. Hence Cyanide have a negative charge.
Explanation:
#sashahow many grams of ammonia produced from 1000 grams of N2?
Answer:
N2 + 3H2 ———> 2NH3
As we know 1000 grams ammonia is 58.82 moles so according to unitary method,
2 mole NH3 formed by 1 mole N2 hence 58.82 NH3 will be given by 29.41 moles N2.
No. Of moles = given mass/molar mass
Implies that
Mass of nitrogen required = 29.41*28 = 823.48 grams.
Explanation:
explain how convection currents affect sea breezes and land breezes.
pls help
Calculate the pH of a solution with [H+] = 1.8 x 10^-5 M
Answer:
4.74
Explanation:
pH= -log[H+]
pH= -log(1.8 x 10^-5)= 4.74
Which process directly moves nutrients from plants to animals?
A. Feeding
B. Breathing
C. Photosynthesis
D. Mineralization
Answer:
Dude its A.Feeding
Explanation:
Its common scene that when u eat you are getting nutrient directly from the food. Come on Sponge Bob Me Boy
A jet is goes from 180km/s to 139km/s in 22 seconds. What is it's acceleration?
14. V=
15. Vp =
16. t=
17a=
The pH of a solution can be calculated using which formula?
Answer:
The formula for calculating pH is pH=−log[H_3O+ ]
pH is the negative logarithm (to base 10) of hydronium ion concentration
The pH Formula can also be expressed as
PH= - log[H+ ]
Graphite is one of the allotropes of carbon
a) Define the term allotropy
b) Identify the other allotrope of carbon
c) State two uses of graphite
Answer:
When an element exists in more than one crystalline form, those forms are called allotropes; the two most common allotropes of carbon are diamond and graphite. Every carbon atom is covalently bonded at the four corners of the tetrahedron to four other carbon atoms.
Why is soap able to break down oils and fats?
Answer:
When you build up a soapy lather, the molecules help lift the dirt, oil and germs from your skin
Explanation:
Soap molecules have one end that bonds with water and the other end that bonds with oils and fats .
Hope this helped!!
2. How many chlorine atoms are in 4 moles of chlorine?
Answer:
4
Explanation:
A sample of nitrogen gas is stored in a 0.500 L flask at 101.3 atm. The gas is transferred to a 0.750
L flask. What is the pressure of nitrogen in the second flask if the temperature remains constant?
Answer:
67.5 atm
Explanation:
To answer this problem we can use Boyle's law, which states that at constant temperature the pressure and volume of a gas can be described as:
P₁V₁=P₂V₂
In this case:
P₁ = 101.3 atm
V₁ = 0.500 L
P₂ = ?
V₂ = 0.750 L
We input the data:
101.3 atm * 0.500 L = P₂ * 0.750 L
And solve for P₂:
P₂ = 67.5 atm
Arenediazoniums can undergo electrophilic aromatic substitutions with a wide variety of activated aromatic compounds to yield new azo dyes.
a. True
b. False
what conditions are needed to prevent iron from rusting?
The half-cell is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction. Type the half-cell reaction that takes place at the anode for the cobalt-silver voltaic cell. Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) for an aqueous solution. Do not forget to add electrons in your reaction.
Answer: Anode : [tex]Co(s)\rightarrrow Co^{2+}(aq)+2e^-[/tex]
Cathode : [tex]Ag^+(aq)+e^-\rightarrrow Ag(s)[/tex]
Explanation:
Electrochemical cell is a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy.
The standard reduction potential for cobalt and silver are as follows:
[tex]E^0_{Ag^+/Ag}=+0.80V[/tex]
[tex]E^0_{Co^{2+}/Co}=-0.277V[/tex]
Reduction takes place easily if the standard reduction potential is higher (positive) and oxidation takes place easily if the standard reduction potential is less (more negative).
Here Co undergoes oxidation by loss of electrons, thus act as anode. Silver undergoes reduction by gain of electrons and thus act as cathode.
Anode : [tex]Co(s)\rightarrrow Co^{2+}(aq)+2e^-[/tex]
Cathode : [tex]Ag^+(aq)+e^-\rightarrrow Ag(s)[/tex]
Overall reaction : [tex]Co(s)+2Ag^+(aq)\rightarrrow Co^{2+}(aq)+2Ag(s)[/tex]
How many molecules of carbon tetrafluoride, CF4, are in 176 grams of CF4?
Answer:
1.2*10^24 molecules of CF4
Explanation:
the molar mass of cf4 is 88.0043 g/mol
176/88.0043 = 2 moles of CF4
Then multiply by avogadro's number (6.022*10^23) to get the number of molecules
2*6.022*10^23 = 1.2*10^24 molecules of CF4
There are 1.204 × 10²⁴ molecules of carbon tetrafluoride in 176 grams of CF4.
HOW TO CALCULATE NUMBER OF MOLECULES:
The number of molecules in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number:no. of molecules = no. of moles × 6.02 × 10²³The number of moles in CF4 can be calculated as follows:moles of CF4 = mass of CF4 ÷ molar mass of CF4. Molar mass of CF4 = 12 + 19(4)Molar mass of CF4 = 88g/molmoles of CF4 = 176g ÷ 88g/molmoles of CF4 = 2molNo. of molecules = 2 × 6.02 × 10²³no. of molecules = 12.04 × 10²³no. of molecules = 1.204 × 10²⁴ Therefore, there are 1.204 × 10²⁴ molecules of carbon tetrafluoride in 176 grams of CF4.Learn more at: https://brainly.com/question/11815186?referrer=searchResults
A solution is prepared by dissolving 0.23 mol of hypochlorous acid and 0.27 mol of sodium hypochlorite in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly. The pH does not decrease drastically because the HCl reacts with the ________ present in the buffer solution. The Ka of hypochlorous acid is 1.36 × 10-3.
Answer:
hypochlorite ion
Explanation:
The hypochlorous acid, HClO, is a weak acid with Ka = 1.36x10⁻³, when this acid is in solution with its conjugate base, ClO⁻ (From sodium hypochlorite, NaClO) a buffer is produced. When a strong acid as HCl is added, the reaction that occurs is:
HCl + ClO⁻ → HClO + Cl⁻.
Where more hypochlorous acid is produced.
That means, the HCl reacts with the hypochlorite ion present in solution
How long did it take to get the Hubble Telescope into space?
What type of ions have names ending in -ide?
O only cations
O. only anions
O only metal ions
O only gaseous ions
Answer:
Only anions
Explanation:
Polyatomic positive ions often have common name ending with the suffix anions
3 Zn + 2 H3PO4 → 3 H2 + Zn3(PO4)2
How many grams of Zn are needed in order to produce 0.15 g of H2?
Answer: 4.87 g
Explanation:
We know that for every 3 moles of zinc that are consumed, 3 moles of hydrogen are produced (we can reduce this to the number of moles of zinc consumed = moles of hydrogen produced)
We know that the formula mass of hydrogen is 2(1.00794)=2.01588 g/mol, so in 0.15 g, there is about 0.15/2.01588 = 0.074409191023275 moles.
This means that about 0.074409191023275 moles of zinc are needed, and since the atomic mass of zinc is 65.409 g/mol, the answer is (0.074409191023275)(65.409)=4.87 g
the name of the acid present in milk
Answer:
lactic acidThe real acidity of milk is due to lactic acid. This is never found in milk when it is first drawn from the udder. It is produced by the action of the lactic acid organisms on the milk sugar. The so-called apparent acidity of milk is what gives fresh milk its acid reaction.
Question 6 of 30 Carbon dioxide subliming is an example of which of the following?
Answer:
dry ice or solid carbon(iv)oxide
Explanation:
carbon(iv)oxide that sublimes is known as dry ice or solid CO2 and it is used to refrigerate food instead of ordinary ice which will just melt when exposed to hot conditions and there4 will lead to the destruction of food. dry ice will sublime the moisture from the food there4 keeping out any moisture