Consider the reaction 4Fe(s) + 3O2(g) --> 2Fe2O3(s) How many grams of oxygen are needed to produce 12.5 g of Fe2O3 (iron(III) oxide)?

Answer:

a

Explanation:

first one i did the test trust me

◆ Atomic mass of carbon (C) = 12g

◆ Atomic mass of oxygen (O) = 16g

= 3.57

= 3.57

Simplest ratio :-

= 3.57 : 3.57

= 1 : 1

Empirical Formula = CO

Answer: from the lies this is synthesis reaction

Explanation:

It's also oxidation-reduction reaction. Li is oxidised and

H is reduced

The given reaction of lithium metal with water is an example of replacement reaction where, the OH group from water is replaced into LiOH.

A replacement reaction is a type of  reaction in which the an atom or group of one reactant is replaced into other reactant. Other type of reactions are combination reaction, decomposition etc.

In a combination reaction, two reactants combine together to form a product without any regrouping. In decomposition reaction a reactant is decomposing to form two or more constituent groups or molecules.

Combustion is the reaction of compound with oxygen to form water and carbon dioxide and synthesis is the making of new product using some reagents going through certain stages.

Hence, the reaction of lithium with water forming lithium hydroxide is a replacement reaction.

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Explanation: The awnser would be The effects of warmed water on aquatic life

Answer:

sulphur mozron tried is an ignore a compound with the formula SN it is the Sulphur and a log of the traditional nitric oxide no sulphur monitor ID names smiles and plus s - properties chemical formula and as molar mass 46.07 gmo l - 1

Answer:

Scientific Notation: 4.45963 x 109 km (29.811 A.U.) Scientific Notation: 4.53687 x 109 km (30.327 A.U.) By Comparison: If you weigh 100 pounds on Earth, you would weigh 110 pounds on Neptune.

Answer:

The radial velocity curve describes how fast a star is moving in its orbit around a center of mass ( m )

Curve amplitude : This is the maximum value of the radial velocity curve

Radial velocity shape ; The shape of Radial velocity curve is parabolic in nature

Orbital period : Orbital period is the time taken by the star  to make one complete rotation in its orbit

Explanation:

The radial velocity curve describes how fast a star is moving in its orbit around a center of mass ( m ) while Curve amplitude  is the maximum value of the radial velocity curve also The shape of Radial velocity curve is parabolic in nature. and  Orbital period is the time taken by the star  to make one complete rotation in its orbit

Epithelial

I know just one

Synthesis reaction~~

Explanation:

Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

Answer: Yes, magnesium will replace hydrogen because magnesium is higher on the activity  series list.

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.  

A general single displacement reaction can be represented as :

[tex]X+YZ\rightarrow XZ+Y[/tex]

[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]

When magnesium is added to hydrochloric acid, magnesium being more reactive than hydrogen displaces hydrogen atom its salt solution and lead to formation of magnesium chloride and hydrogen gas.

Answer:

0.47094837228 moles

Explanation:

silver nitrate=169.87g per mol

80/169.87 = 0.47094837228

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.47moles of silver nitrate are there in 80.00 grams of silver nitrate.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of moles of substance =given mass of substance ÷ molar mass of substance

Molar mass of 1 mole of silver nitrate=169.87g/mol

mass of silver nitrate= 80g

Substituting all the given values in the above equation, we get

number of moles of silver nitrate=80 ÷169.87

                                                        =0.47moles

Therefore, 0.47moles  of silver nitrate are there in 80.00 grams of silver nitrate.

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Answer:

Sulphuric acid + Magnesium Carbonate → Magnesium sulphate + carbon dioxide + water

Explanation:

Sulphuric acid + Magnesium Carbonate

The products are;

Magnesium sulphate, carbon dioxide and water

MgCO3 (s) + H2SO4 (aq) → MgSO4 (aq) + CO2 (g) + H2O (l)

Word Equation;

Sulphuric acid + Magnesium Carbonate → Magnesium sulphate + carbon dioxide + water

☁️ Answer ☁️

Option 1: When dissolved, sugar molecules have more opportunities to bond with positive-negative water molecules. Therefore, sugar dissolves faster than salt, because its component molecules are more soluble in water.

❤️

Option 2: Sugar can dissolve easier than salt because when you add 8 spoons of salt into water the salt already starts to stay in the bottom of the cup. And, when you add 30 spoons into water the sugar just starts to stay in the bottom of the cup. It’s almost the same.

Hope it helps.

Have a nice day!~ ￣▽￣❤️

Answer:

[tex]\boxed {\boxed {\sf 5.00 \ mol \ Ar }}[/tex]

Explanation:

To convert from mole to atoms, we must use Avogadro's Number: 6.022*10²³. This number tells us the particles (atoms, ions, molecules, etc.) in 1 mole of a substance. In this case, the particles are atoms of argon.

Let's create a ratio.

[tex]\frac {6.022*10^{23} \ atoms \ Ar}{1 \ mol \ Ar}[/tex]

Multiply by the given number of atoms.

[tex]3.01*10^{24} \ atoms \ Ar *\frac {6.022*10^{23} \ atoms \ Ar}{1 \ mol \ Ar}[/tex]

Flip the fraction so the atoms of argon will cancel.

[tex]3.01*10^{24} \ atoms \ Ar *\frac {1 \ mol \ Ar}{6.022*10^{23} \ atoms \ Ar}[/tex]

[tex]3.01*10^{24} *\frac {1 \ mol \ Ar}{6.022*10^{23}}[/tex]

[tex]\frac {3.01*10^{24} \ mol \ Ar}{6.022*10^{23}}[/tex]

[tex]4.998339422 \ mol \ Ar[/tex]

The original measurement of atoms has 3 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place. The 8 in the thousandth place tells us to round the 9 to a 0, which also rounds the 9 in the tenths place to a 0, then the 4 to a 5.

[tex]5.00 \ mol \ Ar[/tex]

There are 5.00 moles of argon.

Answer:

D.phototropism

Explanation:

Phototropism is a type of tropism in which a plant or plant part responds to light. According to this question, a student wanted to investigate the effect of light on the growth of cress seedlings. The student used three different pots for the experiment.

Pot 1 was placed with light from above. Pot 2 was placed in a cupboard with no light. Pot 3 was placed in a window with light from one direction only. However, the image attached to this question shows that the plants in the different pots face different directions in response to light, which depicts phototropism

Answer:okay

Explanation:

Answer:

Calcium ions

Explanation:

Calcium ions entering the cell initiate a signaling cascade that causes small membrane-bound vesicles, called synaptic vesicles, containing neurotransmitter molecules to fuse with the presynaptic membrane.

Answer:

i promise you it's b

Explanation:

its not a or d because gasses are on the right side, its not d because metals are not brittle, and it's not c because theyre good conducters not insulators

answer:

b. metals are found on the left side of the periodic table, good conductors of heat and electricity, and malleable.

explanation:

non-metals are on the right (except for hydrogen, it's on the left-hand side)

good luck :)

hopefully, this helps

have a great day !!

Answer:

Is is talking about h20 water?

Explanation:

Answer:

2C8H18 + 25O2 ----> 16CO2 + 18H2O

Explanation:

Basically you can first list all your elements from your products and reactants:

C       8 x 2                         C             1 x 16

H      18 x 2                        H             2 x 18

O       2 x 25                      O             (2 x 18) + (2 x 16)

Answer:

it is a

watch for kJ vs J as the enthalpy is in kJ and entropy is in J

Explanation:

Answer:

Chemical energy is stored in the bonds that connect atoms with other atoms and molecules with other molecules

Explanation:

Answer:

I would say the living for many plants and animals

True I hope this helps!!!!!!!!

Explanation:

Examples of herbivores are buffalo, elk, some bird species, mice, squirrels, rabbits, and many more.

To solve this, we must know each and every concept behind herbivores and  carnivores. Therefore, herbivores include cows, goats, giraffes, sheep, and zebras etc.

Herbivores, often known as herbivorous animals, are creatures that eat plants, leaves, fruits, and other plant-based foods for nourishment. They are classified as primary eaters and are found at levels 2 or above in the food supply chain.

Herbivores include cows, goats, giraffes, sheep, and zebras. Interestingly, there really are herbivores who specialize in eating on specific parts of the plant; for example, frugivores are herbivores that graze on fruits, whereas folivores are herbivore that eat on leaves.

Therefore, herbivores include cows, goats, giraffes, sheep, and zebras etc.

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Answer:

Wowowoowoww

St0p tHe sPamM MaAn

Okay little brain

Answer:

12.o44

Explanation:

Molar mass of naoh is 40g/mol

Number of moles=given mass/molar mass

=80/40=2mol

Again no of atoms 2x6.022x10"23=12.044

According to the concept of Avogadro's number, there are 0.527×10²³molecules in  3.5 g of NaOH​.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.Number of molecules= 3.5/40×6.023×10²³=0.527×10²³molecules .

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Answer: See explanation

Explanation:

1. Separation of charges in an object without touching it is (charging by induction).

2. The work done moving a positive test charge between two points in an electric field divided by the magnitude of the test charge is the electric (potential difference).

3. An electric (conductor) is a material through which charges move about easily. (Charging by conduction) is giving a neutral object a charge by touching it with a charged object.

4. A material through which electrical charges does not move easily is an electrical (insulator).

5. The lines providing a picture of the size and strength of the field around a charged object are called the (electric field lines).

6. The property of the space around a charged object that exerts a force on other charged objects is the (electric field).

7. A device that helps determine charge using pieces of metal foil is an (electroscope).

8. The magnitude of the charge of an electron is the (elementary charge)