I need help with this science question

7300 mg

7.3x10^-3 kilograms = 7300 milligrams

The evaporation of water from your skin is an example of an endothermic reaction because heat is lost from the body as the water evaporates from the skin.

Based on the heat changes that occur in reaction, reactions can be classified into two types;

Exothermic reactions are reactions in which the heat content of the reactants is greater than the heat content of the products. Hence, heat is given out during the reaction. An example is the dissolution of acids in water.

Endothermic reactions are reactions in which the heat content of the reactants is less than the heat content of the products. Hence, heat is absorbed during the reaction. An example is the evaporation of water from the skin.

Other types of endothermic reactions are the melting of ice and thermal decomposition.

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The example 'recycle and reuse materials' is a way to live sustainability because it involves the use of old materials instead of obtaining new ones (Option 3).

The expression recycling is used to denote the reuse of material with different purposes, which involve the absence of extraction techniques that may be harmful to the environment and therefore promote sustainability.

Therefore, with this data, we can see that recycling is an excellent manner to maintain the sustainability objective in order to reduce the need to obtain more and more material from nature.

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All the pair of words given have the same relation as chemist has with matter.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.

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Answer: Astronomer: Space

Explanation:

K12 2.18 Unit Test

The self-auto ionization affects the pH at the titration and is greater than 7

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First, remember that:

The vapor pressure of a liquid is directly related to the intermolecular forces present between its molecules. If these forces are stronger, the evaporation rate and the vapor pressure will be lower.

So, we're going to analyze the intermolecular forces of each element:

O2: The molecule of oxygen consist of two oxygen atoms bonded together by a double bond. It consist of just London dispersion forces, so this is a really weak force.

H2O: Water has hydrogen bonds, dipole-induced dipole forces, and London dispersion forces. So it has strong forces.

SO: It consists of London dispersion forces, and there's a difference of electronegativity between S and O, so there's a greater force than the force of O2.

Therefore, O2 could have the highest vapor pressure, as its intermolecular forces are the weakest.

A scientist proposes that an iron bar be divided into smaller and smaller pieces it is right to infer that during this process, the process produces, the smallest piece of the iron (Option A)

Iron has the chemical symbol Fe and the atomic number 26. It is a metal from the periodic table's first transition series and group 8. It is the most common element on Earth by mass, just ahead of oxygen, and makes up much of the Earth's outer and inner core.

Alloy steels, such as carbon steels, are made using iron plus additions such as nickel, chromium, vanadium, tungsten, and manganese. Bridges, power pylons, bicycle gears, cutting tools, and rifle barrels are all made from them. Carbon content in cast iron ranges from 3-5%. It is utilized in the manufacture of pipes, valves, and pumps.

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The size of the particles decides whether vacancy or interstitial diffusion is more likely.

In vacancy diffusion, the atoms moves in a particular direction and the vacancies are filled and new vacancies are created on the places of the atoms.

While in Interstitial diffusion, the atoms moves inside the lattice of the structure of the crystals.

Interstitial diffusion is faster than vacancy diffusion because it is easier to move inside the lattice, and if the size of the atom is small, it will prefer interstitial diffusion over vacancy diffusion. So, smaller the size of the atoms, faster is the rate of interstitial diffusion.

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Only by measuring the separation between the nuclei of two contacting atoms and halving that distance can one determine the radius of an atom. The illustrations show how the environment around an atom can cause it to have a varied radius, even if it is the same atom.

By measuring the distance between the two atoms after two are united, we may determine the atomic size of the new molecule. The third technique for determining an element's atomic size is to create a single covalent link between two atoms and measure the space between them.

Atomic radii in the periodic table change from left to right across a row and from top to bottom along a column. Because of these two patterns, the periodic table's bottom left corner contains the biggest atoms, while the upper right corner has the smallest.

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According to the given statement HSO₄ is the empirical formula of a compound.

Empirical formulae are beneficial since figuring out the molecular formula can be immensely aided by knowing the relative amounts of each constituent in a molecule. Obtaining an n-value is crucial in order to establish the actual number of atoms in a molecule.

Hydrogen = 2 g

Sulphur (S) = 32 g

Oxygen (O) = 64 g

We know, molecular weight of the elements:

H = 2 g/mol

S = 32 g/mol

O = 16 g/mol

This allows us to calculate how many moles there are for each element.

⇒ Moles

= Weight (g) / Molecular weight (g/mol)

For Hydrogen:

⇒ Moles of H = 2/2

⇒ Moles of H = 1 mol

For Sulphur:

⇒ Moles of S = 32/32

⇒ Moles of S =1 mol

For Oxygen:

⇒ Moles of O = 64/16

⇒ Moles of O = 4 mol

To determine the empirical formula, we shall divide the element with the fewest moles by the other elements' moles.

Here, the smallest moles are of Hydrogen and Sulfur i.e. 1 mol

⇒ H = 1/1

⇒ H = 1

⇒ S = 1/1

⇒ S = 1

⇒ O = 4/1

⇒ O = 4

⇒ Empirical formula = HSO₄

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Answer: The correct answer is H2SO4. the other guy is wrong.

Explanation: First, you must convert grams to moles using the molar mass of each element.

2 g H×1 mole H1.008 g H=2 moles H32 g S×1 mole S32.006 g S=1 mole S64 g O×1 mole S15.99 g O=4 mole O

Second, you divide your calculated moles by the smallest mole to get whole-number ratios. Since Sulfur (S) has the smallest amount of moles (1) we will divide by that number.

H=21=2S=11=1O=41=4

So your final answer is H2SO4.

Taking into account the definition of density, the density of the jam in the jar is 1.4 g/cm³.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷ volume

In this case, you know that:

Replacing in the definition of density:

density= 91 g÷ 65 cm³

Solving:

density= 1.4 g/cm³

In summary, the density is 1.4 g/cm³.

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Answer:  The correct answer is 72.0726, so you have chosen correctly!

Explanation:

The carbon weight of C14 is 168g

The total mass (molar weight) of C14H19NO2 is 233g

Therefore, the percent carbon would be 168/233 = 0.721 or 72.1%

Answer: Water has a higher boiling point than methane. Water has a higher boiling point because water molecules have hydrogen bonds, which means MUCH STRONGER intermolecular forces, than methane.

Methane and water have different boiling points. Because water molecules have hydrogen bonds, which equate to much stronger intermolecular interactions than methane, water has a higher boiling point than methane.

The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.

An O-H bond has a bigger bond dipole than a C-H bond because oxygen is more electronegative than carbon. As a result, there is a stronger force of attraction between two water molecules than between two methane molecules.

Therefore, the boiling points of water and methane are dissimilar. Water has a greater boiling point than methane because water molecules have hydrogen bonds, which translate to far stronger intermolecular interactions.

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The compounds that can be represented by the empirical formula CH2 are C2H4, C3H6, and C8H16.

The empirical formula gives the smallest ratio of the total number of atoms present in a compound. It simply gives a ratio of the number of atoms that are present in a compound.

The formula that relates empirical formula with molecular formula is:

                 Molecular Formula  = n × Empirical Formula

Where n is any integer.

Thus CH2 is the simplest ratio of  C2H4, C3H6, and C8H16 and CH2 is the empirical formula of these compounds.

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Answer:

Water has a much higher boiling point than methane because the hydrogen bonds in water have a much stronger intermolecular force than that of methane.

Answer:

False

Explanation:

It is False because in a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Protons (the number on the right of calcium-40 represents number of protons). The tiniest component of ordinary matter, an atom, makes up a chemical element.

Neutral or ionized atoms make up every solid, liquid, gas, and plasma. Atoms typically have a diameter of 100 picometers or less. Due to quantum effects, they are so small atoms that it is impossible to precisely anticipate their behavioral using traditional physics, as if they were tennis balls, for example.

The positively charged particles called protons are found in the hydrogen atom's nucleus. Protons, electrons, and neutrons are the building blocks of an atom. An atom's nucleus, which is located in the middle, contains all of its mass.

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You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N in the same direction and the net force is 45N.

Net force = 20 N + 25 N

Net force = 45 N.

Force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. The SI unit of force is Newton(N).

The Force has different effects:

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Answer:

Explanation:

Fossil fuels got their name because they are made from dead organisms, mostly plants that didn't decay because they were squashed under water or mud with no oxygen.

The first shell of an atom is its electron shell, or energy level.

The subshell is the second shell.

The particular orbital (or "cloud") within that subshell is the third shell.

The position and energy of an electron in an atom are represented by a set of numbers known as quantum numbers.

principal quantum number

azimuthal quantum number

magnetic quantum number

The electron shell, also known as the atom's energy level, is the initial shell. The value of N ranges from 1 to the atom's outermost electron's shell.

By using the connection, the second shell, which is the subshell, determines the magnitude of the orbital angular momentum.

The third shell creates the orbital angular projection momentum along a certain axis and is the particular orbital (or "cloud") within that subshell.

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Concentration of A increases and Concentration of HA decreases.

The buffer solution, a water-based solvent solution, is created by combining a weak acid and its conjugate base, or a weak base and its conjugate acid. They can be diluted or have small amounts of acid or alkali added to them without the pH of the solution altering.

If small amount of OH⁻ is added to a buffer solution containing A and HA, this added OH⁻ will react

with the HA in following way,

HA + OH = A + H₂O

as a result more amount of A will generate and along with that amount of HA will decrease.

Hence we can say,

Concentration of A increases and Concentration of HA decreases . OPTION B is correct.

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ANSWER

The concentration of the solution is 0.2 mol/L

EXPLANATION

Given that;

The mass of sodium carbonate dissolved is 10.6 grams

The volume of the flask is 500mL

Follow the steps below to find the concentration of the solution

Step 1; Find the number of moles of the solute using the below formula

Recall, the molar mass of sodium carbonate is 106 g/mol

The moles of sodium carbonate is 0.1 moles

Step 2; Convert the volume to liters

Let x represents the volume of the flask in liters

The volume of the flask is 0.5L

Step 3; Find the concentration of the solution

Therefore, the concentration of the solution is 0.2 mol/L

The hydrologic cycle is the movement of water.

Water can recycle itself in the water cycle which is called the hydrologic cycle.

This cycle can be considered to start from the evaporation of water from the ocean's surface, making the air moist. As this moist air is lifted it cools and the water vapor condenses. It then forms clouds; in fact, clouds are made from tiny water droplets and ice crystals that are so small that they can float in the air.

The moisture in the atmosphere can also be transported around the globe until it returns to the surface as precipitation. Precipitation may take the form of rain, snow, sleet, or hail. Once the water reaches the ground, water may evaporate back into the atmosphere, or the water may penetrate the surface and become groundwater.

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Answer:

0.636 moles

Explanation:

Complete answer:

Complete answer:The molecular weight of a material is required to tell an individual how many grams there are in one mole of that chemical substance i.e. molecular weight of any substance contains 1 mole of that substance. Then 28 g of $C{{O}_{2}}$ contains = 0.636 moles of $C{{O}_{2}}$.

The concentration of the solution will be 0.2 M.

Given information,

Initial Volume [V1] = 25 ml

Initial Volume in litre = 25/1000 L

                                   = 0.025 L

Initial Concentration [M1] = 6 M

Final Volume [V2] = 750 ml

Final Volume in litre = 750/1000 L

                                   = 0.75 L

Let final Concentration = [M2]

Using the dilution equation, that is

Initial Molarity x Initial Volume = Final Molarity x Final Volume

M1 x V1 = M2 x V2

6 x 0.025 = M2 x 0.75

0.15 = 0.75M2

∴ M2 = 0.2 M

Therefore the concentration of the solution after the dilution process is 0.2M compared to the initial 6M HCl.

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Answer:

5 is the uncertain number

The 0.59  moles of NaCl are present in 35grams of NaCl.

What do you understand by moles?

Chemists employ the mole, as a very significant unit of measurement.

Given:

The given mass of NaCl = 35 gram

The molar mass of NaCl = 58.44 g/mol

By applying the mole's formula = moles = Given mass/molar mass

Moles = 35/58.44 = 0.59 moles

Hence, the answer is 0.59 moles of NaCl

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The kind of bond they will form is an ionic bond where one beryllium atom will donate electrons to two chlorine atoms (option A).

Ionic bond is a type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.

Ionic bonds are formed by atoms with opposite charges i.e. negative (-) and positive (+) charge. The metal is usually positively charged while the nonmetal is usually negatively charged.

According to this question, the molecule beryllium chloride has one beryllium atom, a metal, and two chlorine atoms, nonmetals. This means that an ionic bond will be formed by beryllium atom and chlorine atom.

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Answer: The nebular theory is an explanation for the formation of solar systems.

Explanation: