Answer:
Answer is: mass.
Explanation:
hope this helps!
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 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.
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C4 and CAM plants are _______. A. Adaptations to arid environments b. Adaptations to moist environments c. More common than C3 plants d. Less efficient at water conservation than C3 plants.
C4 and CAM plants are Adaptations to arid environments.
What is arid environments?An environment is known as arid environments, when there is much lack of water available for animal life and plantation. In this environment very less vegetation and animal life is present.
C3, C4 and CAM are the name of the proccess by which plants will consume the environmental carbon for the preparation of their foods in the form of carbohydrates. And these C4 & CAM plants will show adaptation to the arid environment.
Hence, option (A) is correct.
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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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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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Need help on this question
Answer:
It is the 2nd one
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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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.
which term names an environmental cost of fossil fuel consumption
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:
Describe the plum pudding model
Answer:
The plum pudding model is one of several historical scientific models of the atom. ... The plum pudding model has electrons surrounded by a volume of positive charge, like negatively-charged "plums" embedded in a positively-charged "pudding".
How can blood be classified as both individual and class evidence?
Explain the importance of Brownian motion to the development of particle theory
Explanation:
Particles in both liquids and gases (collectively called fluids) move randomly. This is called Brownian motion. They do this because they are bombarded by the other moving particles in the fluid. Larger particles can be moved by light, fast-moving molecules.
Brownian motion is named after the botanist Robert Brown, who first observed this in 1827. He used a microscope to look at pollen grains moving randomly in water. At this point, he could not explain why this occurred.
In a cube full of small fast-moving particles, two much larger particles appear to move at random as a result of collisions with the smaller particles.
Brownian motion
But in 1905, physicist Albert Einstein explained that the pollen grains were being moved by individual water molecules. This confirmed that atoms and molecules did exist, and provided evidence for particle theory.
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.
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.
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
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]
Can somebody plz just answer this 1 question thx!!!
If answered correct (MARK BRAINLIEST)
:D
Answer:
cetacean i think thats the answer
A penny has a mass of 2.498. What is the mass to the nearest tenth of a gram?
Answer:
2.5
Explanation:
you round up because the numbers behind the tenth spot is above 5
Answer:
2.5 gram
Explanation:
2.498
2.50
I rounded there 9 to 0 and put the 4 to 5 so it is 2.50
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! ;)
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
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
3. A baseball has a momentum of 6 kg*m/s. If the mass of the baseball is 3 kg, what
is the baseball's velocity?
Answer:
The answer is 2 m/sExplanation:
To find the velocity given the mass and momentum we use the formula
[tex]v = \frac{p}{m} \\ [/tex]
where
p is the momentum
m is the mass
v is the velocity
From the question
p = 6 kgm/s
m = 3 kg
We have
[tex]v = \frac{6}{3} \\ [/tex]
We have the final answer as
2 m/sHope this helps you
Explain why it might it be helpful if you drank some salad dressing if you were suffering from lead poisoning
This is because salad dressing contain fruit and vegetable which will help in the fight and elimination of toxins.
What are Toxins?These refers to chemical substances which damages an organism. Intake of lead will lead to poisoning of cells of the body which can lead to death.
Salad dressing will help in the fight and elimination of these toxins thereby making it beneficial.
Read more about Toxins here https://brainly.com/question/25193871
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.
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.
Choose the atom or ion that is larger.
Select one:
a. Br-1
b. Br
Answer:
Br^-1
Explanation:
It is an ion that gained an extra electron making it 36 electrons but the other. one is in the neutral state with 35 electrons
Calculate the pH of aqueous solutions having the following ion concentrations at 298 K. A. [H+]=1.0•10^-2M
Answer:
the pH is 2
Explanation:
pH=-log[H+]
pH=-log[1E-2]
pH=2
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!
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.