NEED HELP ASAP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Select the choice that best completes the following sentence.

Simple machines
A.
are tools that make work easier.
B.
reduce the amount of energy needed to do work.
C.
are made up of multiple moving parts.
D.
cannot be combined to make compound machines.

C. Liquid. The Earth is mostly water, namely ocean water which is liquid.

The answer to this is C.

Answer:

A

Explanation:

Final answer:

The gases in the thermosphere are heated directly by the sun, as this layer directly absorbs high energy solar radiation leading to increased temperatures.

Explanation:

The atmospheric gases in the thermosphere are heated directly by the sun. The thermosphere is the layer of the Earth's atmosphere that is directly exposed to the sun's radiation. As solar radiation passes through the atmosphere, shortwave radiation reaches the thermosphere where it is absorbed by the sparse gas molecules present, causing temperatures to rise considerably.

Unlike the lower layers of the atmosphere, such as the troposphere, where heat is primarily transferred from the Earth's surface through longwave radiation, the thermosphere receives its heat directly from the sun, due to the high energy ultraviolet and X-ray solar radiation absorbed by its gases. This direct heating is essential in understanding the thermal dynamics of the upper atmosphere.

= 29,898.4375 Kg

Volume of a prism is given by the formula;

V = base area × height

   = 1.25 m × 1.25 m × 2.15 m

   = 3.359375 m³

Density = 8.9 g/cm³

This is equivalent to ; 8900 kg/m³

Therefore;

Mass = Density × volume

         = 8900 kg/m³ × 3.359375 m³

         = 29,898.4375 Kg

Answer:

3.0 x 104 kg

Explanation:

The type of bond that exists between the two carbon atoms would be a single covalent bond.

Carbon atoms generally have 4 valence electrons and can therefore form bonds with multiple atoms by sharing the electrons with the atoms to reach an octet state. It also has the capacity to form double or triple covalent bonds with different atoms, including itself.

Out of the 4 valence electrons and covalent bonds that can be formed by the carbon, 3 have been formed with hydrogen. Thus only one bond is left and that is what the carbon atom can pick up. Hence, only a single covalent bond can be formed.

More on the carbon atom can be found here:  https://brainly.com/question/4704641

Since mole ratio of magnesium to hydrochloric acid is 1:2, the answer is 1 mole of HCL.

The moles of hydrochloric acid are needed to react with O.50 mole of magnesium is 1 mole

The amount of substance which contains same number of atoms, molecules or ions as the number of atoms present in 12 g of carbon (C-12) is called a mole.

1 mol = 6.023 * 10²³ atoms

In the question

An equation Mg +2HCl --> MgCl₂+H₂ is given

It is asked that  moles of hydrochloric acid  needed to react with O.50 mole of magnesium = ?

It can be seen that the equation given is balanced as the number of atoms of the elements in the reactants is equal to the atoms in the products.

The mole ratio of Mg to HCl is 1 : 2

The mole of Magnesium is 0.5

Therefore the mole of HCl required to react will be  1 mol

To know more about Mole

https://brainly.com/question/26416088

#SPJ2

Answer:

1.04 L

Explanation:

Charles law states that for a fixed mass of gas, volume of gas is directly proportional to the absolute temperature at constant pressure.

[tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]

where V1 is the volume and T1 is absolute temperature at first instance

and V2 is volume and T2 is absolute temperature at the second instance

Absolute temperature is temperature in the kelvin scale

T1 - 25 °C + 273 = 298 K

T2 -   -15 °C + 273 = 258 K

substituting the values in the equation

[tex]\frac{1.2 L}{298K} = \frac{V2}{258K}[/tex]

V2 = 1.04 L

when the temperature is -15 °C the volume is 1.04 L

ANSWER:

its because the ocean has a higher heat capacity.

~batmans wife dun dun dun...aka ~serenitybella

Water is a slow conductor of heat, thus it needs to gain more energy than the sand or dry land in order for its temperature to increase. On the other hand, soil loses its heat much faster. ... Not only do the oceans cover more than 2/3 of the Earth's surface, they also absorb more sunlight and store more heat.

To find the number of sulfur atoms in 64g of sulfur, calculate the moles by dividing the mass by sulfur's molar mass (32 g/mol), then multiply by Avogadro's number to get 1.2044 x 10^24 sulfur atoms.

To calculate the number of sulfur atoms in 64g of sulfur, we use the concept of molar mass and Avogadro's number. The molar mass of sulfur (S) is approximately 32 grams per mole. So, to find the number of moles of sulfur in 64g, we divide the mass by the molar mass:

Number of moles of S = mass of S (g) / molar mass of S (g/mol)

Number of moles of S = 64g / 32g/mol = 2 moles

Now, using Avogadro's number (6.022 x 1023 atoms/mole), we can find the total number of atoms:

Number of sulfur atoms = number of moles of S x Avogadro's number

Number of sulfur atoms = 2 moles x 6.022 x 1023 atoms/mole = 1.2044 x 1024 atoms

So, there are 1.2044 x 1024 sulfur atoms in 64g of sulfur.

The answer would be option D. can only be seperated by chemical means

The answer is C

A mixture is a substance that is made up of two or more materials that can be separated by physical means.

Physical means of separating mixtures include sorting, evaporation, filtration, screening, magnetism, boiling, and chromatography.

Under room temperature where [tex]\text{pK}_w = 14[/tex]:

3.) (A), (B), and (E).

4.) (D).

5.) (B).

What makes a buffer solution? For a solution to be a buffer, it needs to contain large amounts of a weak acid and its conjugate base ion. Alternatively, the solution may contain large amounts of a weak base and its conjugate acid ion.  

Not every one of the five solutions is a buffer solution.

Ethanoic acid CH₃COOH (a.k.a. acetic acid) is a weak acid. pKa = 4.756. CH₃COONa is a salt. It dissolves to produce CH₃COO⁻, which is the conjugate base ion of CH₃COOH. The solution in (A) contains equal number of CH₃COOH and CH₃COO⁻, both at 1.0 M.

Refer to the Henderson-Hasselbalch equation for buffers of weak acids.

[tex]\displaystyle \text{pH} = \text{pK}_a + \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Acid}]}}[/tex].

[tex]\displaystyle \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Acid}]}} =\ln{1} = 0[/tex].

The pH of the solution in (A) will be the same as the pKa of CH₃COOH. pH = 4.746.

Consider the hydrogen halides:

The radius of halogen atoms increases down the group, and hydrogen-halogen bond becomes weaker. It becomes easier for water to break those bonds. As a result, the strength of hydrogen halides increases down the group. HF is the only weak acid among the common hydrogen halides.

Mixing HBr and KBr at equal ratio will be similar to mixing HCl and KCl at the same ratio. All HBr in the solution breaks down into H⁺ and Br⁻. The pH of the solution will depend only on the concentration of HBr.

[tex]\displaystyle [\text{H}^{+}] = [\text{HBr}] \\\phantom{[\text{H}^{+}]}= \frac{n}{V} \\\phantom{[\text{H}^{+}]}= \frac{c(\text{HBr})\cdot V(\text{HBr})}{V(\text{HBr})+V(\text{KBr})}\\\phantom{[\text{H}^{+}]}=\frac{0.100\;\text{L}\times 1.0\;\text{mol}\cdot\text{L}^{-1}}{0.100\;\text{L}+0.100\;\text{L}} \\\phantom{[\text{H}^{+}]}= 0.50\;\text{mol}\cdot\text{L}^{-1}[/tex].

[tex]\text{pH} = -\log{[\text{H}^{+}] = -\log{0.50} \approx {\bf 0.30}[/tex].

Similarly to HCl and HBr, HI is also a strong acid. Mixing HI and NaOH at equal ratio will produce a solution of NaI, which is similar to NaCl. The final solution will be neutral. pH = 7 if pKw = 14.

NH₃ is a weak base. NH₄Cl dissolves completely to produce NH₄⁺ and Cl⁻. NH₄⁺ is the conjugate acid of NH₃. The final solution will contain an equal number of NH₃ and NH₄⁺. pKb = 4.75 for ammonia NH₃.

Apply the Henderson-Hasselbalch equation for buffers of weak bases:

[tex]\displaystyle \textbf{pOH} = \text{pK}_b + \log{\frac{[\text{Conjugate Ion}]}{[\text{Weak Base}]}}= 4.75 + \log{1} = 4.75[/tex].

Note that what this equation gives for buffers of weak bases is the pOH of the solution. pH = pKw - pOH. Assume that pKw = 14. pH = 14 - 4.75 = 9.25.

The solution in (E) will contain about 1.0 M of CH₃COOH. The volume of the solution will be 200 mL.

[tex]n(\text{CH}_3\text{COO}^{-}) = n(\text{NaOH}] = c\cdot V = 0.10\;\text{mol}[/tex].

[tex]\displaystyle [\text{CH}_3\text{COO}^{-}] = \frac{n}{V} = {0.10}{0.10 + 0.10} = 0.50 \;\text{mol}\cdot\text{L}^{-1}[/tex].

There's nearly no conjugate base of CH₃COOH. As a result, the solution will not be a buffer, and the Henderson-Hasselbalch Equation will not apply. Refer to an ICE table:

[tex]\begin{array}{c|ccccccc}\text{R}&\text{CH}_3\text{COO}^{-} &+&\text{H}_2\text{O}&\rightleftharpoons &\text{CH}_3\text{COOH}&+&\text{OH}^{-}\\\text{I}&0.50\\\text{C}& -x &&&& +x &&+x\\\text{E} &0.50 - x &&&&x&&x\end{array}[/tex]

The value of pKa is large. Ka will be small. the value of [tex]x[/tex] will be much smaller than [tex]0.50[/tex] such that [tex]0.50-x \approx 0.50[/tex].

The pKa of a weak acid is the same as pKw divided by the pKb of its conjugate base.

[tex]\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]} = \text{K}_b(\text{CH}_3\text{COO}^{-}) \\\phantom{\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]} }= \frac{\text{K}_w}{\text{K}_a(\text{CH}_3\text{COOH})} \\\phantom{\displaystyle \frac{[\text{CH}_3\text{COOH}]\cdot[\text{OH}^{-}]}{[\text{CH}_3\text{COO}^{-}]}} = \frac{10^{-14}}{1.75\times 10^{-5}} = 5.71\times 10^{-10}[/tex].

[tex]\displaystyle \frac{x^{2}}{0.50} =5.71\times 10^{-10}[/tex].

[tex][\text{OH}^{-}] = x \approx 1.69\times 10^{-5}\;\text{mol}\cdot\text{L}^{-1}[/tex].

[tex]\text{pH} = \text{pK}_w + \log{[\text{OH}^{-}]} = 9.23[/tex].

Law of Conservation of Energy and Mass. The law of conservation of energy, a fundamental concept of physics, states that the total amount of energy remains constant in an isolated system. It implies that energy can neither be created nor destroyed, but can be change from one form to another.

D. Energy is transferred when atoms are rearranged

Answer:

adds more liquid

Explanation:

Answer:

B. Wood Burning

Explanation:

When you boil water, it is still water, just in vapor form

When glass breaks, it is still glass.

when frozen water (ice) melts, it is still water.

When you mold iron, it is still iron.

When you burn wood, it is not still wood. It is a new form of matter. It is ash.

I hope I helped!

Let me know if you need anything else!

~ Zoe

This Kingdom is the Protists Kingdom.

Answer:

Protists kingdom

Explanation:

The Protista Kingdom is one of the kingdoms of living beings, characterized by eukaryotic, autotrophic or heterotrophic and unicellular or multicellular organisms. Protists comprise protozoa and algae. There are also myxomycetes, organisms similar to fungi, but classified as protists.

Despite all this diversity, this kingdom is best represented by the presence of protoariums that are, in the great majority, microscopic eukaryotic beings (have a library) and heterotrophic beings that live in aquatic and humid environments. They can live alone or form colonies with a differentiation of specialized reproductive cells.

Hey im happy to help!

your answer here will be:

D) The chemicals illegally dumped may cause lymphoma to occur at a higher rate.

Hope this helps, have an amazing rest of your day!

Answer:

The correct answer is option D) "The chemicals illegally dumped may cause lymphoma to occur at a higher rate".

Explanation:

In the graph "Occurrence of Lymphoma" it can be noticed that the lymphoma rate was higher for people living near the factory (local rate), but as times went by, the national rate started to be as high as the local rate. By analyzing this data it can be concluded that the chemicals illegally dumped may cause lymphoma to occur at a higher rate. The chemicals that affect people living locally started to affect people around the nation because they were illegally dumped. I attached the missing graph.

I. An electric current can be produced by a changing magnetic force.

II. A magnetic force can be produced by an electric current.

Answer:

I. An electric current can be produced by a changing magnetic force.

II. A magnetic force can be produced by an electric current.

B would be right. Liquids are closer together than gases and liquids move slower.

Taking into account the definition of liquid state and gaseous state, the correct option is option b. They are closer together and slower moving than the particles in a gas.

Matter comes in three states or forms of matter: solid, liquid, and gas.

The solid state is characterized because the particles that compose it are very close together and in more or less fixed positions; this makes the distance between the particles practically unchanged.

This is due to the fact that the attractive forces are very strong, so the shape and volume are constant.

In the case of the liquid state, the forces between the particles are weaker than in the solid state, which allows the particles to have some freedom of rotation and translation, in addition to vibration.

That is why liquids, unlike solids, take variable forms, depending on the container that contains them and can also flow easily.

In the gaseous state, the attractive forces are practically zero, so they occupy all the available space, and they move much faster. In addition, they can be compressed and take the shape of the container that contains them.

In summary, the correct option is option b. They are closer together and slower moving than the particles in a gas.

Learn more:

i believe its A. the temperature of the liquid

C. 352.6 m/s

Velocity of sound is dependent on temperature. An increase in temperature, increases the velocity of sound.

To calculate the velocity of the sound wave, we use this formula:

V = 331 + [0.6*T]; Where V is the velocity and T represents temperature.

When the temperature is 36 degree Celsius, we have 

V = 331 + [0.6 * 36]

V = 331 + 21.6 = 352.6 

Therefore,

 V = 352.6 m/s.

Answer:

Endothermic reaction.

Explanation:

Reactants + heat ↔ Products.

As the temperature cooled, it is like that decreasing the concentration of reactants side, that shifts the reaction towards the lift side (reactants side) to attain the equilibrium again.

So, the reaction is an endothermic reaction.

D. Endothermic because it needs the sunlight's energy!

Good Luck!!! Hope I helped!

Answer: The correct answer is Option D.

Explanation:

Endothermic reactions are defined as the reactions in which energy is absorbed by the system. The total enthalpy change of the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy is released by the system. The total enthalpy change of the reaction comes out to be negative.

Decomposition reaction is defined as the reaction in which a large substance breaks down into two or more smaller substances.

Photosynthesis is defined as the process by which the producers make glucose molecule with the help of carbon dioxide and water in the presence of sunlight.

The chemical equation representing this reaction follows:

[tex]6CO_2+6H_2O+\text{light}\rightarrow C_6H_{12}O_6+6O_2[/tex]

As, the energy term is written on the reactant side. This means, that the energy is getting absorbed by the system and is considered as an endothermic reaction.

Hence, the correct answer is Option D.

Washing your hands before eating?

Answer:

Inflammation.

Explanation:

The same reason you would die if your body temperature gets too high. Our bodies are meant to perform at an optimal temperature because the cells within our body perform cellular processes perfectly at that temperature. Same goes with bacteria. At high temperatures, proteins degrade and denature and fail to function. Your membrane transport proteins break apart: you can't get things in or out of your cells. You can no longer establish electron gradients for ATP synthesis: your body can no long provide itself with energy. Your ribosomes denature and fail to carry out protein synthesis: you cannot build new cells to replace the dying ones. You are dead.

The sun is made up of hot gas.

The sun is a star and is the brightest object in the sky. The sun is made up of burning gasses. The sun's light and heat comes from its core which is in the center of it. Flares of hot gas shoot out from the sun's surface.

Answer:

P2 = 150.4 KPa

Explanation:

Gay-Lussac's Law:

at constant volume, the pressure of a gas varies directly with the temperature

∴ P1 = 55 KPa

∴ T1 = - 100.0°C ≅ 173 K

∴ T2 = 200°C ≅ 473 K

⇒ P2 = ?

⇒ P2 = (473 K)(55 KPa) / (173 K)

⇒ P2 = 150.4 KPa

The pressure of the gas when the temperature is increased to 200°C will be 150 kPa.

We can use Gay-Lussac's Law, which states that the pressure of a given mass of gas is directly proportional to its absolute temperature (in Kelvin) when the volume is kept constant. Mathematically, this can be expressed as:

[tex]\[ \frac{P_1}{T_1} = \frac{P_2}{T_2} \][/tex]

where [tex]\( P_1 \)[/tex] and [tex]\( T_1 \)[/tex] are the initial pressure and temperature, and [tex]\( P_2 \)[/tex] and [tex]\( T_2 \)[/tex] are the final pressure and temperature, respectively.

First, we need to convert the temperatures from Celsius to Kelvin:

Initial temperature [tex]\( T_1 \)[/tex] in Kelvin is:

[tex]\[ T_1 = -100.0^\circ C + 273.15 = 173.15 \text{ K} \][/tex]

Final temperature [tex]\( T_2 \)[/tex] in Kelvin is:

[tex]\[ T_2 = 200^\circ C + 273.15 = 473.15 \text{ K} \][/tex]

Now we can apply Gay-Lussac's Law to find the final pressure [tex]\( P_2 \)[/tex]:

[tex]\[ \frac{55 \text{ kPa}}{173.15 \text{ K}} = \frac{P_2}{473.15 \text{ K}} \][/tex]

Solving for [tex]\( P_2 \)[/tex]:

[tex]\[ P_2 = \frac{55 \text{ kPa} \times 473.15 \text{ K}}{173.15 \text{ K}} \][/tex]

[tex]\[ P_2 = \frac{25923.25 \text{ kPa}}{173.15} \][/tex]

[tex]\[ P_2 \approx 150 \text{ kPa} \][/tex]

B) H30+ is the answer, hope that helped

Answer: Option (B) is the correct answer.

Explanation:

A hydronium ion is an ion that contains three hydrogen atoms and one oxygen atom. Formula of a hydronium ion is [tex]H_{3}O^{+}[/tex].

Whereas water is a molecular compound with chemical formula [tex]H_{2}O^[/tex].

Hydroxide ion has formula [tex]OH^{-}[/tex] and a hydrogen ion has formula [tex]H^{+}[/tex].

Therefore, we can conclude that out of the given options [tex]H_{3}O^{+}[/tex] is a hydronium ion.

Ammonia is produced by the reaction of hydrogen and nitrogen. N2(g)+3H2(g)→2NH3(g)ammonia How many moles of N2 reacted if 0.65mole NH3 is produced? How many moles of NH3 are produced when 1.2moles H2 reacts? 2.In the acetylene torch, does this answer your question?

We can use the dilution formula to find the volume of the diluted solution to be prepared

c1v1 = c2v2

Where c1 is concentration and v1 is volume of the concentrated solution

And c2 is concentration and v2 is volume of the diluted solution to be prepared

Substituting the values in the equation

15 M x 25 mL = 3 M x v2

v2 = 125 mL

The 25 mL concentrated solution should be diluted with distilled water upto 125 mL to make a 3 M solution

To dilute 25 mL of 15 M nitric acid to prepare a 3 M solution, the final volume after dilution should be c. 125 mL.

To dilute 25 mL of 15 M nitric acid to prepare a 3 M solution, you can use the formula:

C₁V₁ = C₂V₂

Where C₁ = concentration of the stock solution, V₁ = volume of the stock solution, C₂ = final concentration, and V₂ = final volume after dilution.

To prepare a 3 M solution, you need to dilute the 25 mL of 15 M nitric acid to a final volume of 125 mL.

Correct question is: To what volume should 25ml of 15m nitric acid be diluted to prepare a 3M solution

a. 120 ml

b. 130 ml

c. 125 ml

d. 135 ml

Lizards are reptiles that are closely related to snakes. Like all reptiles, lizards have scaly skin and are ectotherms—cold-blooded animals whose body temperature varies with the temperature of their surrounding environment. Most lizards are native to the tropics, but a number of species are found in temperate regions.Chameleons, iguanas, skinks, monitors, anoles, and geckos are some of the many different types of lizards.

A number of lizard species have adapted to life in the desert. Some desert lizards have toes fringed with spiny scales to help them run across the sand without sinking. Others burrow into the sand to escape the desert's intense heat, to hide from predators, or to search for small animals that they prey upon. Some burrowing lizards even have clear scales on their eyelids that protect their eyes but still allow them to see while they move under the sand.

I hope you find it helpful!!!!!

The definition that explains H₂O as acid is Bronsted-Lowry concept, and Lewis concept. Thus, options B and C are correct.

An acid is given as the characteristics of a compound to liberate the hydrogen ion in the solution. The acid have the pH lower than 7 in the pH scale.

According to Bronsted Lowry concept an acid is the donor of the proton. Thus, since H₂O gives the Hydrogen ion in the solution than it is considered as acid.

According to the Lewis concept, an acid is the acceptor of the electron pair. The hydrogen in the water accepts the electron pairs thereby it is a Lewis acid.

Thus, the concepts that explains H₂O as acid is Bronsted-Lowry concept, and Lewis concept. Thus, options B and C are correct.

Learn more about Lewis acid, here:

https://brainly.com/question/15570523

#SPJ2

Answer: b, c

Explanation: