Answer:
129.4g
Explanation:
Reaction equation":
4Al + 3O₂ → 2Al₂O₃
Given mass of oxygen = 115g
Unknown:
mass of aluminum metal that reacted;'
Solution:
We need to convert the given mass of O₂ to mole;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of O₂ = 2(16) = 32g/mol
Number of moles = [tex]\frac{115}{32}[/tex] = 3.6mol
From the balanced reaction equation:
3 moles of O₂ reacted with 4 mole of Al
3.6 moles of O₂ will react with [tex]\frac{3.6 x 4}{3}[/tex] = 4.8mol
Mass of Al = number of moles x molar mass
Mass of Al = 4.8 x 27 = 129.4g
5 10 Which organelle is the control center of the cell? vacuole endoplasmic reticulum cytoplasm
Answer:
nucleus
Explanation:
Answer:
Nucleus Is the control center of the cell
Explanation:
Hope it help
By weight atmospheric air is approximately 23.15% oxygen and 76.85% nitrogen. What is the partial pressure of oxygen in the air at standard temperature and pressure
Answer:
Partial pressure of oxygen = 23.38 kpa (Approx)
Explanation:
Given:
Amount of oxygen = 23.15%
Amount of nitrogen = 76.85%
Pressure (missing) = 101 kpa
Find:
Partial pressure of oxygen
Computation:
Partial pressure of oxygen = [Amount of oxygen x Pressure]/100
Partial pressure of oxygen = [23.15% x 101]/100
Partial pressure of oxygen = 23.38 kpa (Approx)
what was the slope of the best fit line
Answer:
sorry I don't really know
What is the maximum number of electrons on the outer layer of atoms?
Answer:
8 electrons
Explanation:
Based on its location in the periodic table, what can most likely be predicted about sulfur?
Answer:
A
Explanation:
Edg answer
Answer:
C
Explanation:
What is the expected major organic product from the treatment of 4-methyl-2-pentyne with excess hydrogen in the presence of a platinum catalyst?
a. (E)-4-methyl-2-pentene
b. (Z)-4-methyl-2-pentene
c. (E)-2-methyl-2-pentene
d. (Z)-2-methyl-2-pentene
e. 2-methylpentene
Answer:
(Z)-4-methyl-2-pentene
Explanation:
Hydrogenation is a syn addition. This implies that the hydrogen atoms add to the same face of the multiple bond.
Hence, if we have the alkyne, 4-methyl-2-pentyne which reacts with excess hydrogen in the presence of a platinum catalyst, we obtain (Z)-4-methyl-2-pentene since the hydrogen atoms add on the same side of the multiple bond.
How many moles of CO2 are produced when 2.5 moles of O2 react according to the following equation? C3H5 + 5 O2 → 3 CO2 + 4 H2O
Answer:
1.5
Explanation:
C3H5 + 5 O2 → 3 CO2 + 4 H2O
3.75 moles of CO2 are produced when 2.5 moles of O2 react.
The following chemical equation is given:
C3H8 + 5O2 → 3CO2 + 4H2O
Based on this balanced chemical equation, 5 moles of O2 react to produce 3 moles of CO2
Stoichiometrically, if 2.5 moles of O2 react, then:
2.5 × 3/2 moles of CO2 will be produced
= 2.5 × 1.5
= 3.75moles
Therefore, based on the balanced chemical equation between propane (C3H8) and oxygen (O2), 2.5 moles of O2 will produce 3.75moles of CO2.
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explain why sodium trioxocarbonate is an alkaline
Answer:
Sodium triocarbonate (IV) is hydrolyzed in water.
Explanation:
" When sodium carbonate is added to water, it hydrolyses to give sodium bicarbonate and sodium hydroxide (a strong base). As a result, the solution becomes alkaline. ... This is because the liberated metals react with water."
Alkaline: of, relating to, containing, or having the properties of an alkali or alkali metal : basic especially, of a solution (water is a solution).
I hope this answers your question! Let me know if it doesn't!
A chemical reaction that releases heat to the surroundings is said to be __________ and has a __________ ΔH at constant pressure.
Explanation:
A chemical reaction that has a positive ΔH is said to be endothermic, while a chemical reaction that has a negative ΔH is said to be exothermic.
Describe the famous experiment related to gravity that Galileo may have performed. Include the results. Also, state whether the results support the law of gravity. Explain your answer.
Answer:
Galileo performed a famous experiment where he used a ball rolling on a ramp (inclined plane) to study the motion of objects under the influence of gravity. The ramp allowed him to make more precise measurements because the ball moved more slowly along the ramp than if it were simply dropped. Galileo discovered through this experiment that the objects fell with the same acceleration, proving his prediction true, while at the same time disproving Aristotle's theory of gravity (which states that objects fall at speed proportional to their mass). Galileo's conclusion from this thought experiment was that no force is needed to keep an object moving with constant velocity. Newton took this as his first law of motion. One result of the experiment surprised Galileo, and one surprises us. Galileo found that the heavy ball hit the ground first, but only by a little bit. Except for a small difference caused by air resistance, both balls reached nearly the same speed. And that surprised him. According to history, Galileo’s experiment on falling bodies largely contributed to Isaac Newton’s Law of Gravity. In Galileo’s experiment, he is said to have dropped balls from the Leaning Tower of Pisa. The balls were made of the same material but had different masses. Galileo set out to prove that the time it took for these objects to reach the ground would be the same. Galileo proved that objects reached the ground at the same time,
Explanation:
I think this is right & I hope this helped
Galileo demonstrated that gravity causes things of various masses to fall with the same acceleration by dropping weights from the leaning Tower of Pisa.
What is gravity?Gravitational force is the force by an object attracts other objects into its center of mass. Earth attracts every objects on its surface to the ground by gravitational pull.
The outcome of Galileo's gravity experiment supports the equivalence principle, which forms the basis of general relativity, Albert Einstein's theory of gravity.
According to this theory, an object's inertial mass which determines how quickly it accelerates when a force is applied and gravitational mass which determines how much of a gravitational force it experiences are the same. The conclusion is that an object's acceleration due to gravity is dependent of both its mass and composition.
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ID:
16. A mineral is always a(n)
because it has a definite volume and shape.
Answer:
Solid
Explanation:
Mendeleev created this table as he noticed that a
metal that was reactive with water always seemed to
come before a metal that was also very reactive and
then a less reactive metal, noticing a pattern in
chemical properties. But what group of atoms did he
totally leave out? Why do you think that is?
Answer:
Mendeleev had left the noble gases out of his periodic table.
Explanation:
Mendeleev's periodic table is pictured in the image attached to the question.
Mendeleev's table obviously lacked the noble gases. The reason for this grave omission is simple; the noble gases were not known as at the time when he formulated his periodic table. There weren't any known elements whose properties were similar to the properties of the noble gases. This would have lead him to suspect their existence.
what is the main function of the skeletal system in relation to the muscular system
A. to produce enzymes that help muscles repair themselves
B. to provide attachment points for muscles
C. to produce muscle cells inside the bone marrow
D. to assist muscles in growth and development
Answer:
B
Explanation:
muscles attach to the skeleton in order for the body to be sturdy. as you probably know, the skeletal system is mainly used for providing support to the body so it won't fall down.
11. Which of the following statements describe anions? Select all that apply.
They have gained electrons.
Negatively charged ions.
Positively charged ions.
They have lost electrons.
Answer:
They have gained electrons.
Negatively charged ions.
Explanation:
Anions are negatively charged ions because they have gained electrons. Therefore, option (A), (B) is correct.
What are anions?Ions form from the atoms and electrons that have either gained or lost one or more valence electrons which would create either a positive or a negative charge.
The ions that possess a negative charge are called anions and the ones that possess a positive charge are called cations. Since both of them have opposite charges, they get attracted to one another.
Anions are negatively charged ions and are formed when non-metal gains electrons. The atoms gain one or more than one electron, they have a net negative charge. A few examples of anions are Iodide (I⁻), and hydroxide (OH⁻).
The chloride anion Cl⁻ would show that it has one less proton than the total number of electrons in it which gives it a minus charge.
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Can somebody please help me with these 3 questions ? and explain them so I can understand them
Explanation:
1. The group of atoms above bonded together is
called a molecule.
Therefore,
Option A is correct ✔
2. There's 4 H-atom in 2H₂O
Therefore,
Option A is correct ✔
3. There's 2 molecules in 2Al₂O₃
Therefore,
Option A is correct ✔
Determine the number of moles of a sample at 1.8 atm, 130 mL, and 78°C.
What is the pH of a solution in which [H 3O +] = 3.8 × 10 -8 M?
Answer:
The answer is 7.42Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ { H_3O}^{+}][/tex]
From the question we have
[tex]pH = - log(3.8 \times {10}^{ - 8} ) \\ = 7.420216...[/tex]
We have the final answer as
7.42Hope this helps you
plzz helpp mee putttt
Answer:
The first one is C and the second one is A
Explanation:
Looking at the picture, the horse-like fossil was able to walk and run
The second one is sedimentary because fossils are preserved in the sedimentary rock
How many neutrons does an element have whose electronic formula is 1s²2s²2p⁵
Answer:
it have 10 neutrons and it is Fluorine(F).
How many liters of fat would have to be removed to result in a 5.2 lb weight loss? The density of human fat is 0.94 g/mL?
The body fat of humans can be measured by the density in grams per mL. The volume of the fat with a density of 0.94 g/mL and mass of 5.2 lb is 2.50 L.
What is volume?The volume is the factor of the dimension that inversely affects the density of the substance. The volume is given by the division of the mass by the density. It can be given in mL or cubic centimeters.
Given,
Mass of body fat = 5.2 lb
Density of human fat = 0.94 g/mL
At first, mass is converted from lb to grams as:
1 lb = 453.592 grams
So, 5.2 lb = 2358.68 grams
Secondly, volume is calculated as:
Volume = Mass ÷ density
V = 2358.68 grams ÷ 0.94 g/mL
= 2509.23 mL
Thirdly, volume from ml is converted to L as:
1 mL = 0.001 L
2509.23 mL = 2.50 L
Therefore, 2.50 liters of body fat has to be removed from the body.
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With ionic compounds, the ion charge is the same as the ___ number.
A. methylation
B. anion
C. cation
D. oxidation
Answer:
D. Oxidation
Explanation:
The oxidation state of a pure element is always equal to zero and the oxidation state for a pure ion is equivalent to its ionic charge.
You put 0.025 L of 3.0 M sulfurous acid into a volumetric flask and made a 1.00-L solution. What is the
concentration of the new solution?
Answer:
0.075 M
Explanation:
Step 1: Given data
Initial concentration of the sulfurous acid solution (C₁): 3.0 MInitial volume of the sulfurous acid solution (V₁): 0.025 LFinal concentration of the sulfurous acid solution (C₂): ?Final volume of the sulfurous acid solution (V₂): 1.00 LStep 2: Calculate the final concentration of the sulfurous acid solution
If we add water to the initial solution, we will get a diluted solution. We can calculate the final concentration using the dilution rule.
C₁ × V₁ = C₂ × V₂
C₂ = C₁ × V₁ / V₂
C₂ = 3.0 M × 0.025 L / 1.00 L
C₂ = 0.075 M
Which statement best explains why an object appears green in sunlight?
O The object absorbs most white light and refracts most green light.
O The object refracts most white light and absorbs most green light.
O More green light is absorbed while more red and blue light is reflected.
More green light is reflected while more red and blue light is absorbed.
Answer: A
Explanation: not sure what to say but it’s for sure A it makes sense :) good luck !
The statement best explains why an object appears green in sunlight is (D) More green light is reflected while more red and blue light is absorbed.Hence the correct option is (D).
What is Reflection ?Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.
Common examples include the reflection of light, sound and water waves.
Colored objects look the way they do because of reflected light. When sunlight is shined on a green leaf, the violet, red and orange wavelengths are absorbed. The reflected wavelengths appear green.
Therefore, The statement best explains why an object appears green in sunlight is (D) More green light is reflected while more red and blue light is absorbed.Hence the correct option is (D).
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Write out the (balanced) chemical equation for the reaction that occurs when hypochlorous acid, a weak acid, reacts with water.
Answer:
[tex]HClO+H_2O\rightarrow H_3O^++ClO^-[/tex]
Explanation:
Hello!
In this case, since hypochlorous acid (HClO) is a weak acid, which means it is not complete ionized in aqueous solution, represented by the reaction with water to obtain hydronium ions, which are the responsible of its acidity, and hypochlorite ions, we can write:
[tex]HClO+H_2O\rightleftharpoons H_3O^++ClO^-[/tex]
It is seen it is already balanced since there are three hydrogen atoms, one chlorine atom and two oxygen atoms at both reactants and products. It is important to notice the presence of the equilibrium arrow, which represents that the hydronium ions and the chlorate ions are able to come back to the initial hypochlorous acid and water.
Best regards!
I NEED RIGHT NOW OR I GET AN F!!!!! HELP!!!!!
Describe the three main types of plate boundary interactions:
Divergent boundaries:
Convergent boundaries:
Transform boundaries:
Answer:
boundary interactions: areas where plates move away from each other forming mid-ocean ridges or rift valleys.
divergent boundaries: this happens when 2 tectonic plates move away from each other. along these boundaries earthquakes and magma are common as they are rise from the mantle to the sruface making new oceanic crust.
convergent boundaries: this is an area on earth where 2 or more lithospheric plates collide. they will slide under one another creating a subduction.
transform boundaries: transform boundary is a fault along a plate boundary where the motion is predominantly horizontal. It ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subduction zone.
Explanation:
lithosperic means the solid outer part of the earth.
hope this helps and good luck! :) <3
Calculate the total heat flow, qtotal, when 15.0 g of water is cooled from 115°C to -20.0°C. The heat of fusion of water is 335 J/g, and the heat of vaporization of water is 2.26 kJ/g. The specific heat of liquid water is 4.183 J/gºC, the specific heat of steam is 2.0 J/g°C, and the specific heat of ice is 2.1 J/g°C.
Answer:The dependence of the density, viscosity, and heat capacity of a gas on the temperature. ... C-±r*j~d. (1.19). It Is very difficult to use Equation (1.19) for arbitrary quantities. Oi due tc the ... Equation (1.39) Is also valid for polyatomic g~ases whose tmolecules ... Nikuradze which involved the flow of water in long cylindrical tubes.
Explanation:
The total heat flow of water from the state of ice to vapor form is equal to 38,925 J.
How do we calculate total heat?Total heat flow from ice to vapor form of water will be calculated as:
Total heat = Heat of fusion + Heat of vaporization
Given that, mass of water = 15g
Heat of fusion of water = 15g × 335J/g = 5025 J
Heat of vaporization of water = 2.26kJ/g × 15g = 33.9 kJ = 33900 J
Total heat flow = 5025 + 33900 = 38925 J
Heance total flow of heat is 38,925 J.
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among the intermolecular forces,which forces are typically the weakest
Its metallic. I just took the quiz.
D. London dispersion forces
Chromium oxide reacts with hydrogen sulfide gas to form chromium
Answer:
true
Explanation:
If 50.9 g of aspirin (C₉H₈O₄) are produced from 79.8 g of C₇H₆O₃, what is the percent yield from the reaction below?
C₇H₆O₃ (s) + C₄H₆O₃ (s) → C₉H₈O₄ (s) + HC₂H₃O₂ (aq).
Answer:
This may or may not be right its been a while since I took chemistry but 63.78%
Explanation:
The yield is 50.9 so you would divide the yield by the source.
50.9/79.8= .637844621
than conver that to a percentage and you have your answer I think.
May or may not be right like I said it's been a while but I hope its right and it helps.
if 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed?