Answer:
acid rain is the acidification of the clouds and rain due to the pollution in the air
"Acid rain is the generic name given to precipitation that has bee" lol
How many moles of silver are present in 30. 5 g of silver? Show your solution:))
Answer:
0.28 moles
Explanation:
molar mass of silver= 107.86
[tex]30.5 g Ag*\frac{1 mole Ag}{107.86 g Ag} =0.28 moles[/tex]
Hydrogen reacts with chlorine to form hydrogen chloride (hcl (g), delta.hf = –92.3 kj/mol) according to the reaction below. upper h subscript 2 (g) plus upper c l subscript 2 (g) right arrow 2 upper h upper c l (g). which statement is correct? use delta h r x n equals the sum of delta h f of all the products minus the sum of delta h f of all the reactants.. the enthalpy of the reaction is –184.6 kj, and the reaction is exothermic. the enthalpy of the reaction is –184.6 kj, and the reaction is endothermic. the enthalpy of the reaction is 184.6 kj, and the reaction is endothermic. the enthalpy of the reaction is 184.6 kj, and the reaction is exothermic.
The correct statement for the given reaction is ΔH of reaction equals the sum of delta Hf of all the products minus the sum of delta Hf of all the reactants.
What is ΔHf?ΔHf stands for the change in the heat of formation, every substance have different value for the heat of formation.
Heat of formation for any substance that is present in their elemental or standard form is always zero. Heat of formation for the HCl is given that –92.3 kJ/mol.
Given chemical reaction is:
H₂ + Cl₂ → 2HCl
Heat of formation of the above reaction will be calculated as:
ΔHf = Sum of ΔHf (products) - Sum of ΔHf (reactants)
ΔHf = -92.3 - 0 = -92.3kJ/mol
Hence, option (1) is correct.
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Answer: The enthalpy of the reaction is 184.6 kJ, and the reaction is endothermic.
Explanation: edge 2022
The chemical equation below shows the formation of aluminum oxide (Al2O3) from aluminum (Al) and oxygen (O2). 4Al 3O2 Right arrow. 2Al2O3 The molar mass of O2 is 32. 0 g/mol. What mass, in grams, of O2 must react to form 3. 80 mol of Al2O3? 60. 8 grams 81. 1 grams 122 grams 182 grams.
Formation reaction is the formation of 1 mole of product from the constituents of the reactant molecules. The mass of oxygen that must react is 182 gm.
What is mass and molar mass?Mass of the substance is the weight while the molar mass of the substance is the addition of the atomic mass of the individual mass of the constituent atoms of the compound or the molecule.
The chemical reaction can be shown as:
[tex]\rm 4 Al + 3 O_{2} \rightarrow 2 Al_{2}O_{3}[/tex]
From the reaction, it can be said that 3 moles of oxygen are required to produce 2 moles of aluminium oxide, so x moles of oxygen will be required to produce 3.80 moles of aluminium oxide.
Solving for x:
[tex]\begin{aligned}\rm 2x &= 3.80\times 3\\\\\rm x &= \dfrac{11.4}{2}\\\\&= 5.7\;\rm mol\end{aligned}[/tex]
If 1 mol of oxygen is 32 gm then 5.7 moles of oxygen will be 182.4 gm.
Therefore, option D. 182 gm is the mass of oxygen required.
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Can somebody plz just answer this 1 question thx!!!
If answered correct (MARK BRAINLIEST)
:D
Answer:
cetacean i think thats the answer
Which sentence best describes Earth's revolution around the sun?
options : Tanya should slowly spin the tennis ball once around an imaginary axis.
Tanya should slowly spin the tennis ball five times around an imaginary axis.
Tanya should slowly walk around Becca five times.
Tanya should slowly walk around Becca once.
Answer:
B
Explanation:
Tanya should slowly spin the tennis ball five times around an imaginary axis.
The earth revolves around the sun 1 time per year.
BUT
the earth rotates on its' axis, causing seasons, Summer, winter, autumn, spring
Answer:
In one year Earth makes one revolution around the Sun.
Explanation:
In one day Earth makes one rotation on its axis. Earth also travels on an elliptical orbit around the Sun. And it takes one year to make a complete trip.
Question 1
A chemical reaction in which calcium carbonate, CaCO3, is decomposed results in the productions of two simpler compounds.
+
Caco,
79
Cao
28.00 g
CO
21.97 g
What is the mass of calcium carbonate, to the nearest hundredths of a gram, is decomposed in this reaction?
Answer:
C
Explanation:
Cuz trust me it’s c
Energy is constantly converted from one form to another.
Answer:
The First Law of Thermodynamics (Conservation)
states that energy's always conserved, it cannot be created or destroyed.
Which molecular geometry is least likely to occur with sp3 hybridization?
tetrahedral
trigonal planar
bent
trigonal pyramidal
Answer:
Trigonal pyramid
Explanation:
0.82 moles of CH4, how many grams is it
Answer:
13.1548172
Explanation:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CH4, or 16.04246 gram
so 0.82 × 16.04246
Pls consider Brainliest-ing my answer! It would mean a lot! ;)
0.764 km to centimeters
Convert and express in scientific notation.
Answer:
To centimeters: 76400 cmScientific notation: 7.640 × [tex]10^{-1}[/tex] kmI hope this helps!
The greater a habitat's biodiversity, the greater will be the habitat's, sustainability over time with varying conditions sustainability over time with varying conditions consumption of energy in the form of sunlight consumption of energy in the form of sunlight temperature ranges across the seasons temperature ranges across the seasons distance to the nearest water source distance to the nearest water source
Answer:
The correct answer is: sustainability over time with varying conditions.
Explanation:
A habitat can be defined as the physical and geographical conditions that will positively influence the development of life, in any form.
Therefore, it is correct to say that sustainability over time with favorable conditions will favor the greatness of the habitat.
Sustainability is the ability to preserve a system for the maintenance of future life, so it is ideal for there to be sustainable development across society, so that natural resources are preserved so that biodiversity continues to exist.
How are most elements found in nature?
A. combined with other elements because elements
are generally reactive
b. as pure elements because elements are generally
reactive
С.Most elements are not found in nature.
D. as pure elements because elements are mostly
unreactive
Answer:
D. As pure elements because most elements are unreactive.
Explanation:
This is because, like the answer says. Grass isnt really a toxic chemical that can explode and turn into iron or something when it touches water. And most natural elements are pure.
in a cathode-ray tube, where do the particles originate? towards what do they move?
Answer:
originate at the cathode and move towards the anode.
Explanation:
Both mixtures will be made of more than one substance.
Which elements can form acidic compounds? sulfur
rubidium
arsenic
selenium
silicon
xenon
antimony
Answer:
Any element
Explanation:
Any element that produces an extra proton, aka a Hydrogen cation, or H⁺
Answer:
Any element
Explanation:
What causes water to change from a vapor to a liquid, or a liquid to a solid?.
Answer:
The lack of heat
Explanation:
when vapor gets cold enough, it reverts back to a liquid, when liquid gets cold enough, it freezes into a solid.
Can someone please help?
Name this IUPAC name:
Answer:
ch and aporda e too
Explanation:
hope its help
At room temperature (25°C), the particles for which substance would have the highest average kinetic energy?
Sodium
Sodium
Mercury
Mercury
Neon
Neon
Magnesium
Sodium would have the highest average kinetic energy
Further explanationKinetic Molecular Theory (KMT) states that a gas consists of molecules that move at a constant and random speed. The collisions between molecules are perfectly elastic so that no energy is wasted.
The molecules move in straight lines until they collide
Energy because this motion is expressed as Kinetic energy (KE) which can be formulated as:
[tex]\tt \displaystyle KE=\frac{1}{2}mv^2[/tex]
Average velocities of gases can be expressed as root-mean-square averages. (V rms)
[tex]\large{\boxed{\bold{v_{rms}=\sqrt{\frac{3RT}{Mm} } }}[/tex]
R = gas constant, T = temperature, Mm = molar mass of the gas particles
So
[tex]\tt KE\approx v\approx \dfrac{1}{Mm}[/tex]
The substance would have the highest average kinetic energy = the lowest molar mass
Molar mass :
Sodium : 22,989769 uMercury : 200,59 uNeon : 200,59 uMagnesium : 24,305 uFrom the data above, it shows that Sodium has the smallest molar mass so that it has the largest kinetic energy
Evaporation and condensation
Answer:
Evaporation and condensation are two processes through which matter changes from one state to another.
Explanation:
Change of state is a factor in the processes of condensation and evaporation. Evaporation refers to the transition of a substance from a liquid to a gas. Condensation describes the transition from a gas to a liquid form. They occur when molecules receive or lose energy. Heat is a form of this energy.
A pharmacist works with a 1. 75 M solution of sodium bromide (NaBr) and water. The volume of the solution is 84. 0 milliliters. If the pharmacist dilutes the solution to 1. 00 M, what is the volume of the new solution? Express your answer to three significant figures. The volume of the new solution is milliliters.
Dilution is the method of decreasing the solute concentration in the solution by adding solvent. The new volume after dilution is 147 mL.
What is the relation between molarity and dilution?Molarity and dilution are inversely proportional as the increase in the dilution of the solution the molarity of the solution will decrease as the number of moles of the solute will decrease.
The volume of the diluted solution can be calculated as:
[tex]\rm M_{1}V_{1} = M_{2}V_{2}[/tex]
Where,
Initial molarity = 1.75 M
Initial volume = 84 mL
Final molarity = 1.0 M
Final volume = ?
Substituting values in the equation:
[tex]\begin{aligned}\rm V_{2} &= \dfrac{\rm M_{1}V_{1} }{\rm M_{2}}\\\\&= \dfrac{1.75 \times 84.0}{1}\\\\&= 147\;\rm mL\end{aligned}[/tex]
Therefore, 147 mL is the new volume after dilution.
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The Layers of the Earth video compared the layers of the earth with what type of food?
Question 5 options:
Avocado
Coconut
Hard Boiled Egg
Malted Milk Ball
Coconut is the type of food in which the layers of the Earth is compared with.
What is Earth?This is referred as the third planet from the Sun and is irregularly shaped ellipsoid and has the most life forms present.
The ellipsoid shape of the Earth is the same as that of a Coconut which was why option B was chosen as the most appropriate choice.
Read more about Earth here https://brainly.com/question/10715182
BARINLY PLS HELP ME ASP !!! it’s science I need help fast pls
Which distinguishes chemical changes from physical changes?
A Physical changes are permanent, while chemical changes are temporary.
B) Chemical changes produce new substances, while physical changes do
not.
C Physical changes alter the properties of the substance, while chemical changes maintain the same properties.
D Chemical changes result in a change in mass, while physical changes do not.
Answer:
B.) Chemical changes produce new substances, while physical changes do
not.
This is a chemical change as the products have very different property as compared to reactant not only physically but also chemically. Therefore, the correct option is option B.
What is chemical change?Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.
Cooking is a chemical change not a physical change. During cooking the reaction that is associated is combustion reaction as the by product is carbon dioxide and water. Chemical changes produce new substances, while physical changes do not.
Therefore, the correct option is option B.
Learn more about the chemical change, here:
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#SPJ2
how much energy is required to raise the temperature of 3kg aluminum from 18 Celsius to 23 celsius ?
Answer:
13350 Joules
Explanation:
[tex]q=m*c*(Change in T)[/tex]
m=mass in grams = 3000
c=specific heat capacity = 0.89 J/(g*C)
Change in T= 23-18 = 5 C
Answer:
I think the answer is 13,455 J
Maria determines that the wavelength of a sound wave is 2.50 meters and that the wave is traveling at 340 m/s.
What is the frequency of the sound wave?
Hz
Answer:
Frequency= [tex]\frac{speed of wave}{wavelength} =\frac{340}{2.5} =136Hz[/tex]
Explanation:
Hope this helps.
Na3(Po4)+CaCl2→Ca3(Po4)2+NaCl
Pls explain how did you balanced this equation.
Need help asap
Answer:
3 CaCl2 + 2 Na3Po4 yields Ca3(Po4)2 + 6 NaCl
Explanation:
Answer:
Explanation:
Na3(Po4)+CaCl2→Ca3(Po4)2+NaCl
Start on the left side with the reactants.
There are 3 Na in Na3(Po4) so there must be 3 Na on the right in products.
That means 3 NaCl which has 3 Cl.
But there are only 2 Cl in CaCl2 on the left.
6 is a common multiplier of 2 and 3 so multiply CaCl2 by 3 and Na3(Po4) by 2 to get the balanced equation:
2 Na3(Po4) + 3 CaCl2 → Ca3(Po4)2 + 6 NaCl
Will give brainliest
Which would be least likely to completely dissolve in water?
hydrochloric acid
sulfuric acid
nitric acid
acetic acid
Answer:
acetic acid
give brainiest please
The acid that will least likely dissolve completely in water is acetic acid
What is acid?
Acid chemical substances that reacts with base to produce salt and water. It can be described as a chemical substances which when dissolve in water to produce hydrogen ion .
The physical attribute of acid is that they have sour taste and change blue litmus paper to red.
The strength of an acid is dependent on the hydrogen ion it gives when dissolve in water.
Strong acid are completely ionized and completely dissociate into it ions. hydrochloric acid, sulfuric acid and nitric acid are strong acid therefore, will completely dissolve in water.
Weak acid does not dissociate 100%. They don't completely dissolve in water. Acetic acid are weak acids.
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How can blood be classified as both individual and class evidence?
The
of bomb calorimeter is constant.
temperature
pressure
volume
Answer: Your question doesen't make since and you should word it better but what I think you are asking is...
The ___ of a bomb calorimete is constant, what is the temperatue, pressure and volume of it?
Explanation: GL to the next person who tries to answer this.
Suspensions, solutions, and colloids share some characteristics, but there are important differences among them. Which option best describes the difference between suspensions, solutions, and colloids?
Practice
Select all that apply.
A
A suspension and a colloid are homogeneous, while a solution is heterogeneous.
B
A colloid contains dispersed particles, while the particles in a suspension will settle.
C
A suspension contains visible matter particles, while a solution contains dissolved matter.
The correct statements are B and C.
Further explanationA pure substance can be an element or compound.
A mixture is a combination of two or more single substances. The properties of the mixture component are not lost / unchanged as in compounds.
The mixture can be divided into a homogeneous mixture if the composition/ ratio of each substance in the mixture is the same and a heterogeneous mixture if the ratio of the composition of the substances is not the same (can be varied) in each place.
Mixtures can also be divided into solutions, suspensions and colloids based mainly on the size of the particles
A. Homogeneous mixture = Solution
Heterogeneous mixture = suspension, and colloid
B. Colloids and suspensions have particles but colloid particles remain scattered and do not settle, because generally have a charge between the particles
C. Suspended suspension particles are large so they can be seen, while solution particles in the form of a solute dissolve into the solvent, so they are evenly distributed and cannot be seen (too small)
Answer:
The correct answer are C, D, AND E.
Explanation: I just took the quiz and it is not b and c.
How many grams of lithium chloride are in a 3.0 Molarity solution of 0.5 L?
Explanation:
LiCl2 3 M =
in sol. 1 L there is LiCl2 3 mol
if sol. 0.5 L there is LiCl2 0.5×3 = 1.5 mol
LiCl2 = 6.9 + 35.5(2)
= 6.9 + 71
= 77.9 g
Answer:
63.52g of LiCl are in a 3.0 molarity solution of 0.5L
Explanation:
Moles = Molarity x Volume
Molarity = 3.0 mol/L
Volume = 0.5L
Moles = (3.0) x (0.5)
Moles = 1.5
In order to find the grams dissolved in the solution, we must first find the molar mass of Lithium Chloride (LiCl).
Molar mass of LiCl = (6.9) + (35.45) = 42.35g/mol
Now we multiply the moles by the molar mass of LiCl to get the grams of LiCL dissolved in the solution.
1.5 * 42.35 = 63.52g of LiCl