how many sodium ions are in 1.4 kg of sodium chloride, NaCl?

Answer:

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Explanation:

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Answer:

6. 7870 kg/m³ (3 s.f.)

7. 33.4 g (3 s.f.)

8. 12600 kg/m³ (3 s.f.)

Explanation:

6. The SI unit for density is kg/m³. Thus convert the mass to Kg and volume to m³ first.

1 kg= 1000g

1m³= 1 ×10⁶ cm³

Mass of iron bar

= 64.2g

= 64.2 ÷1000 kg

= 0.0642 kg

Volume of iron bar

= 8.16 cm³

= 8.16 ÷ 10⁶

[tex] = 8.16 \times 10^{ - 6} \: kg[/tex]

[tex]\boxed{density = \frac{mass}{volume} }[/tex]

Density of iron bar

[tex] = \frac{0.0642}{8.16 \times 10^{ - 6} } [/tex]

= 7870 kg/m³ (3 s.f.)

7.

[tex]\boxed{mass = density \: \times volume}[/tex]

Mass

= 1.16 ×28.8

= 33.408 g

= 33.4 g (3 s.f.)

8. Volume of brick

= 12 cm³

[tex] = 12 \times 10^{ - 6} \: m^{3} \\ = 1.2 \times 10^{ - 5} \: m ^{3} [/tex]

Mass of brick

= 151 g

= 151 ÷ 1000 kg

= 0.151 kg

Density of brick

= mass ÷ volume

[tex] = \frac{0.151} {1.25 \times 10^{ - 5} } \\ = 12600 \: kg/ {m}^{3} [/tex]

(3 s.f.)

Answer:

D. Light waves travel fastest through a vaccumm

Explanation:

"In a vacuum , light waves move their fastest: 186,000 miles per second (300,000 kilometers per second). This is also the fastest that anything in the universe moves. But when light waves move through air, water or glass, they slow down."

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Answer:

H₂O

Explanation:

Based electronegativity, water H₂O will have the higher melting point from the given choices. The binding force between hydrogen and oxygen is greater than for the others.

Answer:

H2O

Explanation:

hoffe das hilfts

Answer:

823.2 J

Explanation:

PE = mgh

= (7 kg) (9.8 m/s^2) (12 m)

= 823.2 J

Answer:

Mass=m=7kg

Height=h=12m

Gravitational force=g=10m/s^2

[tex]{\boxed{\sf Potential\:energy{}_{(P.E)}=mgh}}[/tex]

[tex]{:}\longmapsto [/tex][tex]\sf P.E=7×12×10 [/tex]

[tex]{:}\longmapsto [/tex][tex]\sf P.E=84×10[/tex]

[tex]{:}\longmapsto [/tex][tex]\sf Potential\:energy=840Joule [/tex]

Answer:

B. Activation Energy

Explanation: A P E X

Answer: the answer is activation energy

Explanation:

i just took the test

Answer:

Antoine Lavoisier

1) Law of Conservation of Mass

French chemist, Antoine Lavoisier in 1789, studied this law. This law states that “In all physical and chemical changes, the total mass of the reactants is equal to that of the products” or “Mass can neither be created nor destroyed.”

Answer:

97200yrs,

Explanation:

Given parameters:

Half-life of Plutonium - 239  = 24300yrs

Mass of the isotope  = 8kg

Unknown:

Number of years it will take for the amount to reduce to 1kg = ?

Solution:

The half -life of any substance is the time taken for half of the compound to decay to half its original composition.

               Start     first half life     second half life   third half life

mass       8kg              4kg                   2kg                    1kg

Time         0yrs            24300            48600               97200

By 97200yrs, the mass would have been 1kg

Answer:

Option d. is correct

Explanation:

Nitromethane is an organic compound that can be used as a fuel booster in rockets. Its chemical formula is [tex]CH_3NO_2[/tex].

This compound is produced as a result of reaction of sodium chloroacetate with sodium nitrite in aqueous solution.

The electron-dot structure of a nitromethane molecule shows [tex]+1[/tex] charge on the nitrogen.

Option d. is correct

Answer:

1. Chemical reactions

2.Substances

3. Properties

4. Precipitate

5. Light

6. Temperature

7. Color

8. Gas

Explanation:

Chemical reactions are known to produce new substances which have new properties. During the chemical reactions, evidences that are seen are formation of precipitate or light gel, production of gas and change in temperature and color.

Chemical reactions occur when chemical substances come together to react because those substances are compatible with each other.

Orange is the color of Sodium

Explanation:

Sulfur has 6 valence electron

Valence electron shows group( in column)

Answer:

combining 2 grams of copper and 4 grams of sulfur to make 6 grams of copper sulfate

Explanation:

The Law of Conservation of Mass states that matter cannot be created or destroyed in chemical reactions. It posits that the mass of a substance remains unchanged after undergoing a chemical process.

Therefore, according to the question, the procedure that best demonstrates the law of conservation of mass after the chemistry student conducted different procedures is option D.

This is because, the mass of copper and sulfate did not change but merely combined to form a compound.

Question: How many atoms of sodium (Na) are there on either side of the equation?

Options: A) one B) two C) four D) six

Correct answer: D) six

Answer:

It is NOT six, i took the test and got it wrong. The CORRECT answer is 2

Explanation:

Answer: 0.217 mol

Explanation:

To find the amount of moles in a 10 g sample, we need the molar mass of ethanol.

Molar Mass: 46.07 g/mol

Now that we have the molar mass, we can find moles.

[tex]10.0 g*\frac{1mol}{46.07g}=0.217 mol[/tex]

We know that there are 0.217 mol in a 10.0 gram sample.

The cellular respiration process, which generates ATP as the final result, employs oxygen and sugar as reactants. So, the correct option is A.

Cellular respiration is the process by which organisms combine oxygen with food molecules, channeling the chemical energy from those resources into life-sustaining activities while eliminating carbon dioxide and water as waste.

Both oxygen and glucose are reactants in the mobile respiratory system. ATP is the primary component of mobile respiration; waste products include carbon dioxide and water.

Oxygen might be present or absent while cells are respiring. Nonetheless, the activity is essentially known as "cellular respiration" because the cell seems to "respire" by consuming molecular oxygen (as an acceptor of electron) and exhaling carbon dioxide (as an end product).

Therefore, the correct option is A.

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Your question is incomplete, most probably the complete question is:

The process shown in the diagram produces oxygen and sugar. Which

process uses oxygen and sugar as reactants?

Chloroplast

Mitochondrion

Sugar

CO, +H,0

ATP

Heat

Respiration

A. Cellular respiration

B. Water cycle

c. Transpiration

D. Photosynthesis

Answer:

chemical energy

Explanation:

Photosynthesis is the process plants and some algae use to convert light energy to chemical energy stored as sugar within chloroplasts -- the energy factories found in plant cells.

Answer:

The correct answer is option c, that is, H2O.

Explanation:

The two broad classes of molecules are the polar and nonpolar molecules. Polarity illustrates the dispersion of electrical charge surrounding a molecule. The charge is unevenly distributed in a polar molecule, while it is distributed evenly in a nonpolar molecule. It can be said that a polar molecule possesses the regions of partial charge.

A polar molecule like water possesses a dipole, that is, a part of the molecule exhibit a partial negative charge, and the part of the molecule possesses a partial positive charge. Generally, a polar molecule comprises polar or ionic covalent bonds. The polar molecules are generally soluble in polar solvents and are hydrophilic. They have higher melting points because of the strong intermolecular forces between them in the form of hydrogen bonding.

In the given options, H2O is a polar molecule as the hydrogen atoms electrons get fascinated towards the oxygen atom's electrons, which forms a positive charge on the atoms of hydrogen, and a negative charge on the oxygen atom.

Of the molecules, only water (H₂O) is polar and the correct option is option C.

A polar molecule is a molecule that has a partial positive charge (+) and a partial negative charge (-) due to an uneven distribution of electron density. This occurs when there is a significant difference in electronegativity between the atoms within the molecule, causing the electrons to be pulled more towards one atom, creating a polarity.

In a polar molecule, the positive and negative charges are not balanced, resulting in a molecular dipole moment. The molecule may have a distinct positive and negative end, referred to as the poles.

Thus, the ideal selection is option C.

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Answer:The Solar System speed and Milky Way speed should be switched

Explanation:

The Milky Way speed and solar system speed should be switched with each other. Therefore, option (A) is correct.

The rotation of the earth can be described as the spinning of the Earth around its own axis. The axis has an angle of 23(1/2)° and it is perpendicular to the plane of the orbit of the earth. The northern and southern hemispheres lean in a direction away from the Sun because Earth is tilted on its axis. The rotation speed of the earth is 0.3 miles/sec.

The Revolution of the earth is the movement of the Earth around the Sun in a fixed path. The revolution speed of the earth is 30 Km/s or 18.5 miles/sec. The milky way speed of the earth is 370 miles/sec and the solar system speed of the earth is 130 miles/sec.

But according to Luca's chart, the milky way speed is 150 miles/sec and the solar system speed is 370 miles/sec.

Therefore, the solar system speed and Milky Way speed need to be switched.

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Answer:

Physical

Explanation:

Answer:

[tex]T'=30^{\circ} C[/tex]

Explanation:

Initial pressure, P = 125 kPa

Initial temperature, T = 25.0°C

If new pressure is increased to P' = 150.0 kPa

We need to find new temperature. According to Gay-Lussac's law,

P ∝ T

or

[tex]\dfrac{P}{T}=\dfrac{P'}{T'}\\\\T'=\dfrac{P'T}{P}\\\\T'=\dfrac{150\times 25}{125}\\\\=30^{\circ} C[/tex]

So, the new temperature will be [tex]30^{\circ} C[/tex].

Answer:

Balance the following chemical equations:

Explanation:

2N2 + O2 → 2N2O

Answer:

its c on edge 2021

Explanation:

During phase change, kinetic energy does not change, but the potential energy does. Therefore, the correct option is option C among all the given options.

Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, being done on it by exerting a net force. A moving object and particle has kinetic energy, which relies on both its mass and its rate of motion.

This formula only works for particles traveling at low to moderate speeds; for particles traveling at extremely high speeds, it produces results that are too low. The rules of relativity must be applied when an object's speed approaches the speed of light (3 108 meters per second, about 186,000 miles per second). During phase change, kinetic energy does not change, but the potential energy does.

Therefore, the correct option is option C among all the given options.

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Answer:

100 thousand million stars

Explanation:

Answer:

100 to 400 billion stars

Answer:

This is because, the is less chance of trapping impurities in the developing crystal lattice

Answer:

injuries

Explanation:

bc it will burn your hands

Answer:

π = 7.33atm

Explanation:

Osmotic pressure is defined as the pressure that must be applied to stop the mass transfer when a semipermeable membrane separates it of pure water. The equation is:

π = M×R×T

Where P is osmotic pressure

M is molar mass = 0.30M

R is gas constant = 0.082atmL/molK

And T is absolute temperature = 25°C + 273.15 = 298.15K

π = 0.30M×0.082atmL/molK×298.15K

Osmotic pressure of human blood at 25 degree C or at absolute temperature is equal to 7.33 atm.

What is osmotic pressure?

It is defined as the minimum pressure exerted on the solution, which is required to stop the flow of pure solvent from low concentration to high concentration through the semi permeable membrane.

Osmotic pressure can be calculted as :

P = M × R × T

Where, P = Osmotic pressure

M = Molar mass = 0.30 M (given)

R = Universal gas constant = 0.082 atmL/molK

T = Absolute temperature 25 degree C = 25⁰C + 273.15 = 298.15 K

Putting all these values in the given equation, we get:

P = 0.30 × 0.082 × 298.15 = 7.33 atm

Hence, 7.33 atm is the osmotic pressure of blood at 25⁰C .

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Answer:

(f).Condensation

CO2 exist as gaseous state at -10degree 4atm pressure and will become liquid upon increasing the pressure  

Explanation:

Using The phase diagram of CO2 we observe that

Carbon dioxide at -10degree Celsius and 4atm pressure will be in

Gaseous phase. Starting from the same point, 4atm and -10degree Celsius upon increasing the pressure the Carbon dioxide will change into liquid phase above 5.11atm pressure, this happened due to Condensation.

Therefore CO2 exist as gaseous state at -10degree 4atm pressure and will become liquid upon increasing the pressure till 5.11stm.  

The carbon dioxide has been existing in the gaseous state and with condensation, it has been converted to the liquid state. Thus, option F is correct.

The state of the gas at a particular pressure and temperature can be assessed from the phase diagram.

The state of Carbon dioxide at 4 atm and [tex]\rm -10^\circ C[/tex] have been the gaseous state.

The increase in pressure results in the decrease in the volume of the gas, as the pressure has been increased, the molecules will condense and result in the conversion of the gaseous state to the liquid state.

The carbon dioxide has been existing in the gaseous state at 4 atm and [tex]\rm -10^\circ C[/tex].  With the increase in pressure, the state of the gas has been changed to liquid due to condensation. Thus option F is correct.

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Answer:

Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. ... The fire's heat causes molecules in the pan to vibrate faster, making it hotter. These vibrating molecules collide with their neighboring molecules, making them also vibrate faster.

Explanation:

Answer:

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Explanation:

Answer:

0.53 atm

Explanation:

First we have to obtain the number of moles of each gas.

Number of moles of Ne = 10g/20g/mol = 0.5 moles

Number of moles of Ar = 10 g/40 g/mol = 0.25 moles

Total number of moles = 0.5 moles + 0.25 moles = 0.75 moles

Partial pressure of Ar = number of moles of Ar/Total number of moles * total pressure

Partial pressure of Ar = 0.25 moles/ 0.75 moles * 1.60 atm

Partial pressure of Ar = 0.53 atm