HELP ME, MY LAST QUESTION WRONG


Which graph shows acceleration?

Which graph shows acceleration?

A graph of position (meters) versus time (seconds) has a straight line running from 0 seconds 0 meters upward.
A graph of position (meters) versus time (seconds) has a concave line running from 0 seconds 0 meters upward.
A graph of position (meters) versus time (seconds) has a straight line running from 0 seconds positive number of meters downward to some later time 0 meters.

The complete word equation for the rusting of iron is; iron + oxygen + water → hydrated Iron III oxide.

The term rusting has to do with the process by which iron reacts with moisture in the presence of oxygen and forms a flaky substance that reduces the tensile strength of the iron. We know that the process of rusting is an example of an unwanted oxidation reaction and this is why the iron must be protected from rusting.

Thus, the reactants that we can find in the rusting of iron are iron metal, water and oxygen. This is a chemical change because the compound that is produced is quite different in terms of chemical composition from the reactants.

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Answer:

Evaporation

Explanation:

The water evaporated when heat was added causing the water to go.

Answer:

When water is heated the molecules move faster and since they vibrate the evaporate.

Explanation:

sciense :)

Answer:

When a weather phenomenon called a "temperature inversion" occurs, temperature in some part of the troposphere get warmer with increasing altitude, contrary to the normal situation. In the layer above the troposphere, the stratosphere, temperature rises with increasing altitude.

Answer:

1. Crush the sugar into powder.

2. Heat the water.

3. Dissolve it by stirring continuously

Explanation:

1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving

2. Heating the water increases the capacity of water to dissolve sugar.

3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.

To combine ions to form ionic compounds, we need the combine in such a way that it gets neutral charge.

We can combine each anion with each cation to get the 4 compounds we need.

To combine SO₄²⁻ with Pb⁴⁺ we first find the Least Common Multiple of their charges, 2 and 4.

They have the factor 2 in common, so the LCM is 4. This is the final charge of each that will cancel out.

To get 4+, we only need 1 Pb⁴⁺.

To get 4-, we need 2 SO₄²⁻.

So, the formula is:

Pb(SO₄)₂

To combine SO₄²⁻ with NH₄⁺ is easier because one of them has single charge. In this case, we can simply pick one of the multiple charge ion and the same amount that will cancel its charge of the single charged one.

So, we picke 1 SO₄²⁻, ending with 2-.

And we picke 2 NH₄⁺, ending with 2+.

The formula:

(NH₄)₂SO₄

To combine C₂H₃O₂⁻ with Pb⁴⁺ we do the same, because the anion is single charged.

Pick 1 Pb⁴⁺, ending with 4+.

Pick 4 C₂H₃O₂⁻, ending with 4-.

The formula:

Pb(C₂H₃O₂)₄

To combine C₂H₃O₂⁻ with NH₄⁺, both have same charge, so we just need one of each and their charges will cancel out.

The formula:

NH₄C₂H₃O₂

So, the formulas are:

Pb(SO₄)₂

(NH₄)₂SO₄

Pb(C₂H₃O₂)₄

NH₄C₂H₃O₂

Answer:

375 grams

Explanation:

The percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%

Percent yield is defined as the amount of product actually made compared with the maximum calculated yield. It is the ratio of actual yield to the theoretical yield.

Mass of calcium carbonate = 155 g

Mass of HCl = 250g

Mass of calcium chloride product = 142 g

Moles of calcium carbonate = 155 / 100 = 1.55 moles

Moles of HCl = 250 / 36.5 = 6.85 moles

Mass of calcium chloride = Moles x Molar mass

                                          = 1.55 mole x 111 g/ mole

                                          = 172 g /mole

Theoretical yield = 172 g

Actual yield = 142 g

Percent yield = Actual yield / Theoretical yield x 100
                      = 142 / 172 x 100

                      = 82.55 %

Thus, the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%

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Answer:

Explanation:

Data tables help you keep information organized. If you're collecting data from an experiment or scientific research, saving it in a data table will make it easier to look up later. Data tables can also help you make graphs and other charts based on your information.

Answer:

2 moles of nitrogen, 8 moles of hydrogen, 1 mole of sulfur

Explanation: i took the test and got it right

The number of moles for each element in one mole of (NH₄)₂S are:

d. 2 moles of nitrogen, 8 moles of hydrogen, 1 mole of sulfur

The number of moles can be identified by dividing the given mass by molar mass.

In one mole of (NH₄)₂S there are moles of each participating element i.e. nitrogen, oxygen, hydrogen, and sulfur.

In this molecule, there are 2 moles of nitrogen, 8 moles of hydrogen, and one mole of sulfur.

Thus, option d is correct.

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The unknown compound with the chemical formula C2F contains 4.1 moles of fluorine and 2.07 moles of carbon.

From the formula, we can see that there are two carbon atoms and two fluorine atoms in each molecule of the compound. Therefore, the molar ratio of carbon to fluorine in the compound is 1:2.

To determine the empirical formula of the compound, we need to find the simplest whole number ratio between carbon and fluorine. By dividing the moles of each element by the smallest number of moles (2.07 mol), we find that the ratio of carbon to fluorine is approximately 1:2.

Thus, the empirical formula of the compound is CF2, indicating that for every carbon atom, there are two fluorine atoms present in the compound.


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solid(particles are appropriately packed)  in solids there is no distance between the constituent particles

liquid(particles are closely packed).

gas(particles move freely) .

In a gas, the particles are evenly spaced out and not in any particular order. There is no regular arrangement of liquid next to one another. solids are regularly arranged and closely packed.

We can infer from the diagram that there is no space between the individual particles that make up solids. Without any intermolecular voids between the individual molecules, it is a completely packed structure.

In contrast, the particles in liquids are more closely packed than those in gaseous fluids, albeit they are more loosely packed than those in solids. We can now observe that there is a significant intermolecular gap between the constituent particles of gases. They are packed more flimsily than

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In a galvanic cell, the reaction proceeds towards the production of products.  ΔG starts < 0, becomes more negative

Option B is correct .

As the reaction proceeds, the Gibbs free energy (ΔG) reduces, and the following are true:  ΔG starts < 0, becomes more negative.

When the reaction in a galvanic cell proceeds towards the production of products, the Gibbs free energy starts with a negative value, and it becomes even more negative.

The Gibbs free energy (ΔG) is a measure of the available energy in a system that can be used to do work. It measures the difference between the free energy of the final state and the initial state.The Gibbs free energy change of a system is dependent on the enthalpy and entropy change. If the enthalpy change is negative (exothermic), and the entropy change is positive (disorderly), the Gibbs free energy change is negative, and the reaction is spontaneous.

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Answer:

D

Explanation:

When dog start running Front of you And you act Already and run away do you think The dog same to your Question

Answer:

1. Absolute time, also known as Newtonian time is a time that exists independent of the observer of the time, and therefore, can only be expressed through mathematics

Absolute dating is a dating method that makes use of the radioactive property of matter and is determined through dating of radioactive isotopes present

Absolute time (dating) is found through radioactive dating

2. Radioactive isotopes are atoms that have the property of unstable proton neutron combination or excess energy nucleus. They can be fined as unstable element

3. A stabilized isotope are the decay product atoms of the element which are non radioactive.

4. The half life is the time it takes the original isotope to decay into the decay product

5. To determine the age of a rock, the proportion of the original isotope to the amount of decay product in the rock is compared

6. The isotope used to date organic materials is carbon-14

7. The isotope used to date rocks with comparable age to the Earth is Uranium-238 that has a half life of 4.468 billion years

8. The half life of carbon-14 is only 5,700 years while the age of a dinosaur is between 245 and 66 million years ago, and therefore, carbon is absent in most fossils

9. Uranium-238 is only found in igneous or volcanic rocks and not in metamorphic rocks, therefore, fossils  of dinosaur as well as other fossils that are buried in sedimentary materials, including sand and clay, cannot be determined by Uranium-238

Explanation:

Answer:

F.1s 2s 2p 3s 3p 4s3d104p

The element in the first configuration is F and the element in the second option is calcium Ca. The configuration in option c is of cerium Ce and it is cadmium in option D. The configuration in E is mendelevium and F is zinc.

An electronic configuration represents the filling of electrons in various energy level. Electrons fill from the lowest energy levels to the highest energy level.

The first configuration have a total of 9 electrons. The 9th element is fluorine. The second configuration given is of 20 electrons. That is 18 electrons of argon plus 2 electrons in 4s. The 20th element is calcium.

The third configuration have 58 electrons and the element is cerium Ce. The configuration given in option D is of cadmium with 48 electrons and that in option E is mendelevium with 101 electrons.

In the last option, the configuration contain a total of 30 electrons. 3o th element in periodic table is zinc, Zn.

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The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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Answer:

The materials would be best to us for the core to make the strongest electromagnetic to pick up the most nails is described below in detail.

Explanation:

Use a couple of wire strip-pers to exclude some centimeters of insulation from every end of the cable. Skillfully cover the cable around the nail. The more cable you enclose around the nail, the more effective your electromagnet will be. Compose certain that you leave sufficient of the cable unwrapped so that you can connect the battery.

Using the density, the mass of sulfuric acid is 2292.82 grams.

We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as

ρ = m / V

where ρ is density, m is mass and V is volume

From the question above, we know that

ρ = 1.31 g/mL

V = 1 gallon = 4546.09 mL

% sulfuric acid = 38.5%

By substituting the following parameters, we get total mass

ρ = m / V

m = ρ .V

m = 1.31 . 4546.09

m = 5955.38 grams

Find the sulfuric acid mass

ms = %sulfuric acid x m

ms = 38.5% x 5955.38

ms = 2292.82 grams

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Answer:

with what question

Explanation:

The chemical formula of 4- ethyl is C19H40.   This  patch is composed of an ethyl group( C2H5) attached to the fourth carbon  snippet( counting from one end) of a direct carbon chain.

It also has a propyl group( C3H7) attached to the fifth carbon  snippet of the same chain. The chain itself has 12 carbon  tittles and three methyl groups(- CH3) attached to the 3rd, 4th, and 7th carbon  tittles. thus, the complete name of the  emulsion is 4- ethyl, where" dodecane" refers to the 12- carbon chain.

This  patch belongs to the class of alkanes, which are hydrocarbons that only contain single bonds between carbon  tittles. The presence of the ethyl and propyl groups creates branching in the carbon chain, which can affect its physical and chemical  parcels compared to a direct alkane with the same number of carbon  tittles. The three methyl groups contribute to the  patch's overall shape and may also affect its reactivity.

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The question in english language is as follows:

What is the formula of 4-ethyl-5-propyl-3,4,7-trimethyldecane?

The options that correctly contrast the valence bond (VB) model and the molecular orbital (MO) model of bonding are:

Therefore, these are the correct options. The valence bond (VB) model and the molecular orbital (MO) model are two theories that describe how atoms bond together to form molecules.

The valence bond model explains chemical bonding in terms of the overlapping of atomic orbitals between two atoms.

In this model, the bonding electrons are localized between the two atoms, and each bond is formed by the overlap of a pair of valence orbitals (usually hybrid orbitals) from each atom. The VB model also takes into account the directionality of bonds and rationalizes molecular geometries using the VSEPR theory.

The molecular orbital model, on the other hand, describes bonding in terms of the formation of molecular orbitals that are formed by the combination of atomic orbitals from all the atoms in the molecule.

In this model, the bonding electrons are delocalized and shared among all the atoms in the molecule. The MO model does not take into account the directionality of bonds and can be used to describe complex molecular geometries.

Both models are useful for explaining different aspects of chemical bonding, and they can be used together to provide a more complete understanding of molecular structure and reactivity.

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Answer:

answer #2: It shows how many molecules there are of a particular substance.

answer #5 that the other guy posted was wrong as well, it is actually 4,4.

Explanation:

i took the quiz.

Answer:

An electron has a negative electrical charge

Explanation:

To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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\(\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}\)

\(\\ \sf\longmapsto Acceleration=\dfrac{7-0}{0.1}\)

\(\\ \sf\longmapsto Acceleration=\dfrac{7}{0.1}\)

\(\\ \sf\longmapsto Acceleration=70m/s^2\)

The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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As we move down Group 15, ionization energy decreases, while electronegativity values also generally decrease.

Group 15 elements, also known as nitrogen group elements or pnictogens, include nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). When considering these elements in order from top to bottom, the general trend is that their ionization energy decreases. Ionization energy refers to the energy required to remove an electron from an atom. This decrease occurs because the atomic radius increases down the group, causing a weaker force between the nucleus and the outermost electrons.

Electronegativity, the ability of an atom to attract shared electrons in a chemical bond, also generally decreases down the group due to the increasing atomic radius and the shielding effect of additional electron shells. Both these trends are attributed to the increasing number of electron shells as we move down Group 15.

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Answer:

4 hours

Explanation:

Distance

275

Speed

70  miles/h

Calculation results

Time (duration) 3.93 hours

Answer:

bacteria

Explanation:

The pathogen below is a single-celled organism without a nucleus that can cause illness in a humans.

Surface tension is amount of energy required to increase surface area of liquid, surface tension is the result of a net downward and inward force and polar liquid will have a higher surface tension than nonpolar liquid.

The tendency of liquid surface at rest to shrink into the minimum surface area is called as surface tension. It allows objects with a higher density than water such as razor blades and insects to float on water surface without becoming submerged.

Besides mercury, water has the highest surface tension for all liquids, which is due to the hydrogen bond in water molecules.

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