Again can somebody help me with these please and explain ? if anything like you are good at it can you text me and help me if you do not mind. I am having very trouble on this

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 ✔

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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Answer:

A

Explanation:

Edg answer

Answer:

C

Explanation:

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.

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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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!

Answer:

sorry I don't really know

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

Its metallic. I just took the quiz.

D. London dispersion forces

Answer:

0.075 M

Explanation:

Step 1: Given data

Step 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

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

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.

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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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.

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.

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.

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!

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.

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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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).

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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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.

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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Answer:

true

Explanation:

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.

Answer:

8 electrons

Explanation:

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)

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

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.

Answer:

Solid

Explanation:

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.

Answer:

it have 10 neutrons and it is Fluorine(F).

Answer:

nucleus

Explanation:

Answer:

Nucleus Is the control center of the cell

Explanation:

Hope it help