please help with this need it in 6 hours
1.)in the thermit reaction 2Al + Fe2o3= al2o3 + 2 fe. what is the mass of aluminium powder is needed to react with 8.0g of iron (3) oxide
2.) what mass of magnesium sulphate crystals can be made from14.0g of magnesium carbonate and an excess of dilute sulphuric acid
3.) what mass of calcium oxide is formed when 25g of calcium carbonate is decomposed by heat?
4.) Lead (ii) oxide PbO, reacts with hydrogen to for lead and steam. calculate the mass of lead in formed when 446g of lead (ii) oxide is reduced in this way.
5.) what volume of gas is given off when excess calcium carbonate is added to 50cm cube of 2.0M by hydrochloric acid , if the gas volume is measured at s.t.p.?

1. Atomic number is the relative atomic in an atom.

2. Mass number is the number of protons and neutrons in an atom

3. Isotopes are atoms with the atomic same but different mass due to the neutrons number of neutrons in the nucleus.

Atoms of many elements are in the form of molecules or ions because they are the most reactive. Examples are hydrogen oxygen chlorine and other elements. However non-reactive atoms of certain elements exist in nature in a free state. The relative atomic mass of an element is defined as the weight in grams of the number of atoms of that element in 12.00 grams of carbon-12.

The atomic mass of an element is the average mass of the atoms of the element measured in atomic mass units AMU, also known as Dalton D. Atomic mass is the weighted average of all isotopes of that element, the mass of each isotope multiplied by the abundance of that particular isotope. It is the ratio of the average atomic mass of the element from a single specific sample or source to the mass of the carbon-12 atom.

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Answer:

5. F

6. H

7. E

8. B

9. G

10. D

Explanation:

Most of these could have just been looked up online or could've used context clues based on the name. If they are vocab words make sure to memorize them.

Density = Mass/Volume

Density (of the unknown metal) = 180/20

Answer: 9 grams/mL

Granite has a specific heat of 800 J/g °C. the mass of granite is needed to store 150200 J from 30  °C to 75  °C is 4.17 g.

Given that :

specific heat of granite ( c ) = 800 J/g  °C.

Q store = 150,200 J

temperature T1 = 30  °C.

temperature T2 = 75  °C.

now, Q = mc (T2-T1 )

        150200 J = m × 800 J/g  °C ( 75  °C - 30  °C )

         m  =   150200 J/ 800 J/g  × 45

         m  =   150200 g / 36000

         m  =  4.17 g

Thus, Granite has a specific heat of 800 J/g °C. the mass of granite is needed to store 150200 J from 30  °C to 75  °C is 4.17 g.

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The acid dissociation constant for butyric acid is 0.0000145, pH value of its 0.075 M solution will be 2.98, and the pH value of 0.075 M solution of sodium butyrate will be 8.86.

a) The negative logarithmic values of the acid dissociation constant (Ka) for the acid and the base dissociation constant for the conjugate base (Kb) are always 14 in total:

pKa (acid) + pKb (conjugate base) = 14 ⇒ pKa = 14 - pKb

pKa = 14 - 9.16

pKa = 4.84

This means that the Ka for butyric acid is:

[tex]K_{a} = 10^{-4.84} = 1.45 * 10^{-5}[/tex]

b) The expression for butyric acid (HA) acid dissociation constant will look like this:

[tex]K_{a} = \frac{[H^{+} ][A^{-} ]}{[HA]} = \frac{X^{2} }{0.0075 - X}[/tex]

When transformed, this expression gives us a quadratic equation:

X² + Ka * X - 0.075 * Ka = 0

With familiar Ka, when we solve for X, we get:

X = 0.0010356 M = [H+]

We can use this to calculate the pH value of the solution:

pH = -log[H+]

pH = -log0.0010356

pH = 2.98

c) The expression for butyrate basicity will look like this:

[tex]K_{b} = \frac{[OH^{-} ][HA ]}{[A^{-} ]} = \frac{X^{2} }{0.0075 - X}[/tex]

When transformed, this expression gives a quadratic equation:

X² + Kb * X - 0.075 * Kb = 0

With familiar Ka, when we solve for X, we get:

X = 0.0000072 M = [OH-]

pOH = -log[OH-]

pOH = -log0.0000072

pOH = 5.14

pH = 14 - pOH

pH = 14 - 5.14

pH = 8.86

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Answer:

actually it depends on when and on what you had the finger print it could stay a couple of days, weeks or months and still be considered fresh

Answer:

By combining two or more substances, a mixture is produced. A homogeneous solution tends to be identical, no matter how you sample it. Homogeneous mixtures are sources of water, saline solution, some alloys, and bitumen. Sand, oil and water, and chicken noodle soup are examples of heterogeneous mixtures.

Explanation:

Answer:

a)3

b)6

d)24

option c

The possible compositions of the liquid phases are: [tex]x_{1} =0.15[/tex] and  [tex]x_{2} =0.79[/tex], while those of vapor phases are: [tex]y_{1} =0.2[/tex] and  [tex]y_{2} =0.7[/tex]

The given binary mixture of ethanol and ethyl acetate at 100 kPa.

Given plot is temperature versus mole fraction (T-xy) at constant pressure 100 kPa.

In the given plot, the upper curve represents the dewpoint curve and lower curve represents bubble point curve.

At a given temperature 74 C, we can determine the mole fractions as follows:

1. We draw a horizontal lie from 74 °C mole fraction 0 to 1 and it touches lower curve at two points and upper curve at two points.

2. We also draw a vertical line from points where it touches the lower curve gives the composition of liquid and draw a vertical line from points where it touches the upper curve gives the vapor compositions.

From the plot given below, the compositions of liquid where the vertical line touches lower curve are: [tex]x_{1} =0.15[/tex] and [tex]x_{2} =0.79[/tex]

And those for vapor phases where the line touches the upper curve are:

[tex]y_{1} =0.2[/tex] and [tex]y_{2} =0.7[/tex]

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The atomic theory describes Dalton's theory because electron, proton and neutron.

The first a part of his theory states that every one matter is product of atoms, which might be indivisible. The second one part of the concept says all atoms of a given element are equal in mass and houses. The  element says compounds are combos of two or extra distinctive forms of atoms.

One of the maximum essential merits of Dalton's atomic idea is the truth that the idea does no longer violate numerous fundamental laws of chemical combination consisting of the regulation of precise proportions, the regulation of multiple proportions, and the regulation of conservation of mass.

In 1803 Dalton located that oxygen mixed with both one or  volumes of nitric oxide in closed vessels over water and this pioneering remark of fundamental more than one proportions supplied vital experimental proof for his incipient atomic thoughts.

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We can see that the density of the water is less than the density of the saturated salt solution from the table shown above.

The term density is defined as the ratio of the mass to the volume of an object. In this case, we can see that we are trying to compare the density of water and the density of a salt solution. We have to recall that when we dissolve a solute in a solvent, the density of the solution would change to reflect that we no longer have a pure solvent.

This is because, the density of a substance is an intrinsic property thus it then depends on the nature of the substance and not on the amount of the substance.

Thus, we can see that when we dissolve the salt in the water, the density of the water is increased. Thus water has a density of 1 g/mL while a saturated salt solution has a density of 1.12 g/mL.

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During chemiosmosis, hydrogen ions accumulate in the ATP  formation of the mitochondrion to create a large electrochemical gradient for aerobic cellular respiration.

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While heterogeneous matter (from the Greek hetero = different) suggests non-uniformity and discontinuity, homogeneous matter (from the Greek homo = same) can be thought of as being uniform and continuous.

Materials that are homogeneous lack borders, are uniform throughout, and have all of its component elements in the same state. Homogeneous mixtures also include air we and the water we drink from the faucet. Quality is related are also alluded to as solutions.

Whether a mixture is solid, liquid, or gaseous, homogeneous mixtures have the same ratios of their component parts throughout a particular sample. Its composition remains the same throughout. There is just one visible phase of substance in a homogeneous combination.

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Using particles that are intended to adhere to specific cells, injured cells can be treated directly. Early disease detection is made possible by this technique, which also causes less damage to the body's healthy cells.

What medical use do nanoparticles have?

Medicine can now be included in nanoparticles the size of viruses thanks to modern research. Because they can locate damaged cells with extreme precision and administer the medication there, nanoparticles are effective for drug delivery—the administration of the medication to the body.

In the body, nanoparticles are active The epidermis, lining of the lungs, or lining of the intestine are some of the exterior layers of the body through which nanoparticles can enter. The specific physical and chemical characteristics of the particle will determine how successfully they migrate from the outside to the inside

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Matter exists in different states such as solid, liquid and gas because of the kinetic energy of its particles and the intermolecular force of attraction between the particles.

A substance won't condense into a liquid or solid if the average kinetic energy is higher than the attraction forces holding the particles together.

Thus in solids, intermolecular force of attraction > kinetic energy of particles.

In a liquid (or solid), the average kinetic energy of the particles is low enough to allow the forces of attraction to hold the particles together. In a liquid (or solid), molecules do not separate.

In liquids,  intermolecular force of attraction > kinetic energy of particles. But this force of attraction is smaller than solids.

The forces of attraction between the particles in a gas can be overcome by the average kinetic energy of the particles in the gas. When gas molecules collide, they spread apart.

In gas, intermolecular force of attraction < kinetic energy of particles.

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Answer:

No, it cannot be accelerating.

Explanation:

The question explicitly states that the airplane is flying at a constant speed, meaning that its speed is not changing (not accelerating or decelerating).

Oxford Languages definition of constant:

a quantity or parameter that does not change its value whatever the value of the variables, under a given set of conditions.

Answer:

No, as acceleration means increasing speed but the airplane is flying with a constant speed which means there is no increase or decrease in speed

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The table that was completed correctly is B.

Columns in the periodic table are called groups or families because of their similar chemical behavior. All members of the element family have the same number of valence electrons and similar chemical properties. The horizontal columns of the periodic table are called periods.

Moving periodically increases nuclear attraction due to increasing atomic number and decreases the atomic size. Therefore, elements cannot readily donate electrons. Therefore, group 17 elements are strong non-metals, and group 1 elements are strong metals. The elements are arranged in 7 horizontal rows called periods or series and 18 vertical columns called groups. Groups are labeled at the top of each column. In the United States, labels have traditionally been uppercase numbers.

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Answer:

producer and consumer

since the The caterpillar will later evolve and develop into a cocoon.

The cocoon will evolve into a butterfly and hence the organism will grow and develop.

Being a herbivorous animal the caterpillar represents consumer and plant is a producer.

The caterpillar also helps in rearing silk hence they are producers and consumers also

Anatomist and physiologist Theodor Schwann is best known for formulating the cell doctrine, which holds that all living things are made up of cells.

Theodor Schwann put forth the classical cell theory in 1839. This theory consists of three parts. All organisms are composed of cells, according to the first section. The basic building blocks of life exists cells, according to the second section.

Anatomist and physiologist Theodor Schwann is best known for formulating the cell doctrine, which holds that all living things are made up of cells. He proved that the cell is the fundamental building block of all living things.

All known living things are composed of one or more cells, according to the modern cell theory. By dividing, pre-existing cells become all living cells. All living things have cells as their basic unit of structure and operation.

Therefore, the correct answer is option d) Theodor Schwann did experimentation that demonstrated new cells come from existing, living cells.

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The temperature at which a liquid's vapour pressure equals the pressure around it and the liquid transforms into a vapour is known as the boiling point of a substance. A liquid's boiling point varies depending on the atmospheric pressure in the area.

A liquid partially vaporises into the space above it at any temperature up until the vapour pressure of the liquid at that temperature, which is a characteristic value. When a liquid reaches its boiling point, vapour bubbles form inside the liquid and rise to the surface as the temperature rises, increasing the vapour pressure.

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A bond between two atoms whose electronegativity values differ anywhere from 0.5 and 2.0 is called a polar covalent bond, whereas a bond between atoms whose electronegativities differ by 2.0 or more is considered an ionic nonpolar bond.

A covalent bond in which the atoms always have an unequal attraction for electrons which results in the unequal sharing of electron is a polar covalent bond.

If the difference in electronegativity is more than 1.7 or 2.0, ionic nonpolar bonds are formed as the ionic bonds are formed by the electron donation from the atom which is less electronegative to the atom which is more electronegative.

Electrons are shared in ionic and covalent bonds but differently.  Non-polar or polar covalent bonds can be formed and they can react to electrostatic charges.

Ionic bonds are formed due to electrostatic force between negative and positively charged ions, thus, electronegativity is more than 2.0.

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Answer:

you wont ever get this one but ok

Explanation:

lol

Since the samples are all at room temperature, the substance which is most likely the most dense is: D. silver.

Density can be defined as a ratio of mass to the volume of a physical substance such as chlorine, oxygen, bromine, silver, etc.

Mathematically, the density of a physical substance can be calculated by using this formula:

D = M/V

Where:

At room temperature, the density of the given physical substances in an ascending order are as follows:

In this context, we can reasonably and logically deduce that silver is the most dense among the given physical substances.

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The element which an alien with ten mouths need is Tungsten ( W ).

Tungsten is an element in the periodic table which belongs to group vi. It is a transition metal. Transition metals has the ability to form complex ions. Alien such as those with ten mouths need tungsten for sustenance.

An element is a substance which cannot be split into smaller forms by ordinary process. The element in the periodic table are structured into groups and periods. The vertical arrangements of chemical elements in the periodic table is the group while the period is the horizontal arrangements.

Chemical elements are also classified as metals, nonmetals and metalloids.

So therefore, tungsten is needed by aliens.

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Chemical decomposition, also known as chemical breakdown, refers to the process or effect of breaking down a single chemical entity (normal molecule, reaction intermediate, etc.) into two or more fragments. The chemical breakdown is commonly thought of and characterized as the inverse of chemical synthesis.

The mechanics of a decomposition process are not usually fully defined, although some of the processes are understood; breaking bonds requires a lot of energy. Because all decomposition processes break down the bonds that keep it together in order to produce simpler basic parts, the reactions would all require some form of this energy to varying degrees. As a result of this fundamental rule.

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The number of moles of a nitrogen atom in  8.92 mol of  Ba(NO₃)₂ is 17.8 moles of the Nitrogen atom.

The mole, image mol, is the unit of quantity of substance in the worldwide gadget of gadgets. the amount quantity of the substance is a measure of what number of primary entities of a given substance in an object or sample. The mole is described as containing precisely 6.02214076×10²³ essential entities.

The wide variety of basic entities in one mole is referred to as the Avogadro quantity. This definition supersedes the previous definition of a mole as the variety of elementary entities identical to that of 12 grams of carbon-12, the maximum commonplace isotope of carbon.

1 mole = 6.022×10²³ molecules

8.92 mol Ba(NO3)2 =  8.92  × 6.022×10²³ molecules

                                  = 53.72 ×10²³

                                  =  5.372 ×10²⁴ molecule

1 molecule of Ba(NO₃)₂ contain

1 atom of Ba

2 atoms of N

8 atoms of O

5.372 ×10²⁴ molecule = 2 × 5.372 ×10²⁴ atom of nitrogen

                           = 1.07 ×10²⁵ atom of Nitrogen. ( three significant figures)

moles of nitrogen atom =  1.07 ×10²⁵ atom of Nitrogen /6.022×10²³

                                        = 17.8 moles of the Nitrogen atom.

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There are 115 protons in the element 115 and due to the large number of protons, the element does not exist in nature.

Also, the element can not be isolated in nature that is IUPAC had to require an independent confirmation of the element.

We know that the periodic table is an arrangement of the atoms in order of increasing atomic number. We know that the larger the atomic number of the element, the less likely that the element would be stable in nature. The element that have been named 115 is called Moscovium and was discovered in Moscow as a product of a radioactive experiment. The number of protons in element 115 is 115 protons

Generally, the element number 115 does not exist in nature because if the proton number in an element exceeds 82, the repulsion between the protons would make it almost impossible for the nucleus to be a stable nucleus.

The reason why IUPAC had to request an independent confirmation of the element is because it does not exist in nature.

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P is the symbol for the element phosphorous. It has an atomic mass of 30.974 and an atomic number of 15.

The chemical element phosphorus has the atomic number 15 and the letter P in its name. Phosphorus (P), a nonmetallic chemical element of the nitrogen family (Group 15 [Va] of the periodic table), is a colorless, semitransparent, soft, waxy solid that glows in the dark. It appears to exist in two main forms: white phosphorus and red phosphorus. However, due to its high reactivity, phosphorus is never found on Earth as a free element. Phosphorus is a nonmetallic allotrope element found in living things and phosphates. The red form of phosphorus is less reactive and harmless and is used in alloys, matches, and insecticides. Ordinary phosphorus is a poisonous, combustible, and phosphorescent white solid.

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