Answer:
A is the right answer
Explanation:
In double replacement reaction two compounds combines to give other two compounds
As example:
CaCl2 + 2AgNO3 = Ca(NO3)2+ 2AgCl
Which statement describes the law of conservation of energy?
A. All systems will exchange matter and energy with their surroundings.
B. All systems can exchange energy, but not matter, with their surroundings.
C. Energy cannot be created nor destroyed, but it changes from one form to another.
D. Energy is destroyed in most chemical reactions when new products are formed.
Answer:
Energy cannot be created nor destroyed, but it changes from one form to another.
Explanation: got it
What happens when a solid turns straight into gas and skips the liquid stage?
Answer:
Explanation:
Liquid to solid phase transitions are known as "freezing.". Solid to liquid phase transitions are known as "melting.". Solid to gas phase transitions are known as "sublimation.". In most cases, solids turn into gases only after an intermediate liquid state.
2+5*6
how to get over someone
me and him were together for 10 months
TWO HYDROGEN ATOMS COMBINE TO FORM HELIUM ATOMS RESULTING IN THE FORMATION OF...
when two heavy hydrogens combine to for helium , it results in the formation of energy, and a neutron, along with the helium atom
Answer:
When two nuclei form one atom, fusion reactions occur. Two hydrogen atoms combine to produce helium with the sun's reaction. It looks very simplified as follows: H+ H + D + D + H + D. This is referred to as a mass deficit and that mass differential becomes energy.
Explanation:
Write the balanced half equation of iron 2 and permanganate in a solution of acid. Show all of your work.
Answer:
5Fe⁺² + MnO₄⁻ + 8H⁺ => 5Fe⁺³ + Mn⁺² + 4H₂O
Explanation:
Fe⁺² + MnO₄⁻ + H⁺ => Mn⁺² + Fe⁺³ + H₂O
5(Fe⁺² => Fe⁺³ + 1e⁻) => 5Fe⁺² => 5Fe⁺³ + 5e⁻
MnO₄⁻ + 5e⁻ => Mn⁺² => MnO₄⁻ + 8H⁺ + 5e⁻ => Mn⁺² + 4H₂O
=> 5Fe⁺² + MnO₄⁻ + 8H⁺ => 5Fe⁺³ + Mn⁺² + 4H₂O
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*URGENT*
Best answer gets marked Brainliest!
The table below shows several minerals found in earths crust based on the information in the table which mineral is also an element
A) Calcite
B) quartz
C) hematite
D) graphite
Answer:
Graphite, because it has atoms of same atomic and electrovalent electrons
Two flasks are connected by a closed valve. One contains gas particles and the other contains a vacuum. If the valve is opened such that the particles move until they fill both flasks, the process by which the particles can reconvene entirely in one of the flasks is: Select the correct answer below:
a. spontaneous
b. nonspontaneous
c. exergonic
d. endothermic
Answer:
b. nonspontaneous .
Explanation:
Hello there!
In this case, by considering the given description, it is possible for us to realize this process is b. nonspontaneous because the molecules of the gas are going to tend to spread all around the flasks instead of convening together unless an external force was applied. In such a way, this cannot be spontaneous as it will occur without any external action, and the concepts of exergonic and endothermic are specifically for chemical reactions.
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Answer the boxes in the image
Answer: the c thingy is where you be like burgundy sauce then be like racial slair is what it mean's so the name thingy
Explanation:
Help please ASAP it’s because I need to send it so please help
Answer:
2
Fe and O
Explanation:
How many grams of solid nickel will be plated if an aqueous nickel(II) sulfate solution is electroplated over 10.5 min with a constant current of 3.20 A
Answer:
613 mg
Explanation:
[tex]$Ni^{2+} + 2e \rightarrow Ni(s)$[/tex]
Number of fargday's [tex]$=\frac{It}{96500}$[/tex]
Here, I = 9.20 A
t = 10.5 min
= 10.5 x 60 seconds
So, [tex]$\frac{It}{96500}$[/tex]
[tex]$=\frac{3.20 \times 10.5 \times 60}{96500}$[/tex]
= 0.0208 F
Here, 2e, 2F
2F = 1 mol of Ni
[tex]$0.0208 \ F = \frac{0.0208}{2} = 0.0104 \ mol \ Ni$[/tex]
1 mol = 59 gm of Ni
0.0104 mol = 59 x0.0104 gm Ni
= 0.613 gm Ni
= (0.613 x 1000 ) mg of Ni
= 613 mg of Ni
pls help my teacher said i have 10 min only
Answer:
is a phenomenon of discotoration of sea surface
caused by algae
causes skin irritation and eye blindness
its not safe to swim
The reaction of an organic compound, like a hydrocarbon, as it burns in the presence of oxygen is called
Answer: combustion
Explanation: When a compound burns in the presence of oxygen the reaction is called a combustion. Like most organic substances, hydrocarbons are combustible. The general reaction is given below. Organic Compound + O 2 (g) ! CO 2 (g) + H 2 O(g) + Heat=Energy (1)
The solubility of copper chloride at 20 °C is 73 g/100 g of water. Kiera adds 100 g of copper chloride to 100 g of water and stirs. What mass of copper chloride remains undissolved? Include units
Answer:
[tex]m_{undissolved}=27g[/tex]
Explanation:
Hello there!
In this case, according to the given information of the solubility of copper chloride, as the maximum amount of this salt one can dissolve without having a precipitate, we infer that since just 73 grams are actually dissolved, the following amount will remain solid as a precipitate:
[tex]m_{undissolved}=100g-73g\\\\m_{undissolved}=27g[/tex]
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convert 32 degrees celsius to kelvin
Answer:
305.15
Explanation:
32 celsius converted to kelvin is 305.15 kelvin
Formula
32°C + 273.15 = 305.15K
PLEASE HELP!!!
A 84.1 g sample of phosphorus reacts with 85.0 g of oxygen gas according to the following chemical equation.
4 P(s) + 5 O2(g) → 2 P₂O5
a. Find the limiting reactant.
b. How many grams of P₂O5 are produced in theory?
c. If only 123 g of P2O5 are produced, what is the percentage yield?
Answer:
(a) oxygen
(b) 154g (to 3sf)
(c) 79.9% (to 3sf)
Explanation:
mass (g) = moles × Mr/Ar
note: eqn means chemical equation
(a)
moles of P = 84.1 ÷ 30.973 = 2.7152 moles
moles of O2 = 85÷2(16) = 2.65625 moles
Assuming all the moles of P is used up,
moles of O2 / moles of phosphorus = 5/4 (according to balanced chemical eqn)
moles of O2 required = 5/4 × 2.7152moles = 3.394 moles (more than supplied which is 2.65625moles)
therefore there is insufficient moles of O2 and the limiting reactant is oxygen.
(b)
moles of P2O5 produced
= 2/5 (according to eqn) × 2.7152
= 1.08608moles
mass of P2O5 produced
= 1.08608 × [ 2(30.973) + 5(16) ]
= 154.164g
= approx. 154g to 3 sig. fig.
(c)
% yield = actual/theoretical yield × 100%
= 123/154 × 100%
= 79.870%
= approx. 79.9% (to 3sf)
12. Convert 1.98 grams of PbSo, to molecules.
No links please
Answer:
3.93 × 10²¹ molecules
Explanation:
Convert 1.98 grams of PbSO₄ to molecules.
Step 1: Given data
Mass of PbSO₄: 1.98 g
Step 2: Calculate the number of moles corresponding to 1.98 g of PbSO₄
The molar mass of PbSO₄ is 303.26 g/mol.
1.98 g × 1 mol/303.26 g = 6.53 × 10⁻³ mol
Step 3: Calculate the number of molecules in 6.53 × 10⁻³ moles of PbSO₄
To convert moles to molecules, we need a conversion factor: Avogadro's number. There are 6.02 × 10²³ molecules of PbSO₄ in 1 mole of molecules of PbSO₄.
6.53 × 10⁻³ mol × 6.02 × 10²³ molecules/1 mol = 3.93 × 10²¹ molecules
Which reaction type is the following: AgF + CaCl2 --> AgCl + CaF2
Explanation:
[tex]{\small{\underline{\bf{\red{answer...}}}}} \\ \\ [/tex]
[tex]\small\mathfrak\purple{Double \: displacement \: reaction} \\ \\ \small\mathfrak\orange{hope \: it \: helps...}[/tex]
An arctic weather balloon is filled with 38.5 L of helium gas inside a prep shed. The temperature inside the shed is 8. °C. The balloon is then taken outside, where the temperature is -41. °C. Calculate the new volume of the balloon. You may assume the pressure on the balloon stays constant at exactly 1 atm. Be sure your answer has the correct number of significant digits.
Answer: The new volume of the balloon is 197.31 L.
Explanation:
Given: [tex]V_{1}[/tex] = 38.5 L, [tex]T_{1} = 8^{o}C[/tex]
[tex]V_{2}[/tex] = ?, [tex]T_{2} = 41^{o}C[/tex]
According to Charles law, at constant pressure the volume of a gas is directly proportional to temperature.
Formula used to calculate the new volume is as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{38.5 L}{8^{o}C} = \frac{V_{2}}{41^{o}C}\\V_{2} = \frac{38.5 L \times 41^{o}C}{8^{o}C}\\= 197.31 L[/tex]
Thus, we can conclude that the new volume of the balloon is 197.31 L.
Why do molecules move?
Answer:
Constant temperature variations
Explanation:
With temperature constantly heating many molecules within many forms of matter tend to move around. Take air for instance and density. When air is hot the molecules are moving very quickly because they are being what is known as energized (I don't know the scientific word I apologize.) However, when air is cold it tends to get harder to breath and that is because the air is more dense, since the molecules are atoms are much more compacted.
To further detail the process of cooling and heating up matter, water when it is cooled it tends to become ice; a solid based structure. Therefore, making it more dense or more compacted together. However, once heated the molecules begin to spread apart, in which the density lessens and the molecules become a liquid state or a gas state (depending on the amount of heat applied in terms of kelvin.)
what is the name of the molecule belowwww
Answer:
A) 2-pentene
Explanation:
We count from side where we encounter double bond closest so that's going to be from left to the 2nd carbon. Total carbons are 5.
Thus pent- for prefix of 5 carbons and -ene as suffix for double bond.
2- for locant of double bond.
Thus, 2-pentene
Given the following information: SO2(g) + 12 O2(g) = SO3(g) Kp = 2.5E-2 What is the Kp value for the following reaction: 2 SO2(g) + O2(g) = 2 SO3(g)
Answer:
K = 6.25x10⁻⁴
Explanation:
Based on the reaction:
SO₂ + 1/2 O₂ ⇄ SO₃ Kp = 2.5x10⁻²
We can find the Kp of a similar reaction using Hess's law where the sum of 2 reactions a and b produce a K that is:
K = Ka*Kb
The sum of twice the reaction of the problem:
SO₂ + 1/2 O₂ ⇄ SO₃
+ SO₂ + 1/2 O₂ ⇄ SO₃
2SO₂ + O₂ ⇄ 2SO₃
Where K must be:
K = Kp*Kp = Kp²
K = (2.5x10⁻²)²
K = 6.25x10⁻⁴Determina cuantos moles hay en 2.31g de NaCl
Answer:
0.0395 mol NaCl
Explanation:
¡Hola!
En este caso, es necesario para nosotros considerar que las relaciones masa-mol se desarrollan teniendo en cuenta las masas molares de los compuestos involucrados en el sistema. Ahora, dado que este sistema se compone de NaCl, cloruro de sodio como sal de mesa, es posible saber que la masa molar de este es alrededor de 58.44 g/mol.
De esta manera, las moles en 2.31 g se calculan como sigue:
[tex]=2.31gNaCl*\frac{1molNaCl}{58.44gNaCl}\\\\=0.0395molNaCl[/tex]
¡Saludos!
A chemist has a small amount of compound that has the boiling point 65°c that must be fractionally distilled. Yet, the chemist doesn't want to lose any of the compound to hold up on the column. What the chemist should do?
Answer:
A "chaser," a high-boiling compound whose vapors will displace the vapors of the desired low-boiling compound, can be used to distill a small amount of compound.
A smaller fractionation apparatus or a Vigreux column could be used instead.
Explanation:
What do you already know about the role of water within your body?
Answer:
it helps us with our blood (Little)
Calcium metal is burned completely in oxygen to form 11.2g of calcium oxide. Find the volume of the required oxygen. (Ca = 40, O = 16, 32 of oxygen has 24.4L) *
Answer:
2.44 L
Explanation:
Step 1: Write the balanced equation
2 Ca + O₂ ⇒ 2 CaO
Step 2: Calculate the mass of O₂ required to form 11.2 g of CaO
The molar mass of O₂ is 32 g/mol and in the balanced reaction, there is 1 mole of O₂, that is, 1 mol × 32 g/mol = 32 g.
The molar mass of CaO is 56 g/mol and in the balanced reaction, there are 2 moles of CaO, that is, 2 mol × 56 g/mol = 112 g.
11.2 g CaO × 32 g O₂/112 g CaO = 3.2 g O₂
Step 3: Calculate the volume occupied by 3.2 g of O₂
Under the conditions of the task, 32 g of O₂ occupy 24.4 L.
3.2 g × 24.4 L/32 g = 2.44 L
elect the best choice, and briefly indicate the reason for your choice: a. Lowest ionization energy: K Rb Cs b. Most favorable electron affinity: Cl Br I c. Most energy required to remove an electron: Cu Cu Cu2
Answer:
Lowest ionization energy: Cs
Most favorable electron affinity: Cl
Most energy required to remove an electron: Cu2+
Explanation:
Ionization energy decreases down the group. That means that as we move down the group, the ionization energy of elements decreases due to greater distance of the outermost electron from the nucleus and greater screening effect of inner electrons on this outermost electron. Hence Cs has the lowest ionization energy.
Electron affinity of halogens decreases down the group. Hence, Cl possess the most favorable electron affinity.
When an electron has been removed from an atom, the removal of the next electron is usually harder. Thus, the second ionization energy is always greater than the first ionization energy and so on. Thus, it is most difficult to remove an electron from Cu^2+ from which two electrons have already been removed.
18. Calculate the molar mass, by titration calculations, of oxalic acid (H2C204) if 25.00 mL of a 0.750
M KOH solution were required to titrate 0.846 grams of oxalic acid.
Explanation:
[tex]1000 \: ml \: contain \: 0.750 \: moles \\ 25.00 \: ml \: will \: contain \: ( \frac{25 \times 0.75}{1000} ) \: moles \\ = 0.01875 \: moles \\ from \: reaction \: eqn \\ H _{2} C _{2} 0 _{4} + 2KOH - - > K _{2}C _{2} 0 _{4} +2H _{2} 0 \\ 1 \: mole \: of \: oxalic \: reacts \: with \: 2 \: moles \: of \: KOH \\ 0.01875 \: moles \: react \: with \: ( \frac{0.01875 \times 2}{1} ) \\ = 0.0375 \: moles \\ 0.0375 \: moles \: weigh \: 0.846g \\ 1 \: mole \: weighs \: 56g[/tex]
Two ways that salinity can increase
Answer:
Evaporation of ocean water and the formation of sea ice both increase the salinity of the ocean.
Explanation:
if two metals has the same specific heat how can distinguish them in two ways
Explanation:
1) Thermal and Electric conductivity
2) Metallic strength
calculate the wavelength of yellow light with the energy of 3.45x10-19 J
Answer: The wavelength of yellow light with the energy of [tex]3.45 \times 10^{-19} J[/tex] is [tex]5.76 \times 10^{-7} m[/tex].
Explanation:
Given: Energy = [tex]3.45 \times 10^{-19} J[/tex]
Formula used to calculate the wavelength is as follows.
[tex]E = \frac{hc}{\lambda}[/tex]
where,
E = energy
h = Planck's constant = [tex]6.63 \times 10^{-34} Js[/tex]
c = speed of light = [tex]3 \times 10^{8} m/s[/tex]
[tex]\lambda[/tex] = wavelength
Substitute the values into above formula as follows.
[tex]E = \frac{hc}{\lambda}\\3.45 \times 10^{-19} J = \frac{6.63 \times 10^{-34} Js \times 3 \times 10^{8} m/s}{\lambda}\\\lambda = 5.76 \times 10^{-7} m[/tex]
Thus, we can conclude that the wavelength of yellow light with the energy of [tex]3.45 \times 10^{-19} J[/tex] is [tex]5.76 \times 10^{-7} m[/tex].