How would you describe a particle of alpha radiation?
-a helium atom with no neutrons
-an electron ejected from a neutron
-a highly energized light particle, or photon
-a helium nucleus with no electrons

Answer:

the answer is 0.13 moles

Final answer:

To find the number of moles in 2.35 grams of H2O, divide the mass by the molar mass of H2O (18.015 g/mol) to get approximately 0.130 moles.

Explanation:

To calculate the number of moles in 2.35 grams of H2O, you need to use the molar mass of water as the conversion factor. The molar mass of water (H2O) is calculated by summing the molar masses of 2 hydrogen atoms (2 x 1.0079 g/mol) and 1 oxygen atom (15.999 g/mol), which equals 18.015 g/mol.

To find the moles of water in 2.35 grams, use the following conversion:

Divide the mass of the H2O by the molar mass:

2.35 g H2O / 18.015 g/mol = 0.130 moles of H2O

Answer:

The correct answer is 6.39 kg.

Explanation:

Water is produced at 12.5 degree C, thus, the final temperature is 12.5 degree C.  

In the given case, q1 will be the heat required for the conversion of ice to water, and q2 will be the heat required to produced water exhibiting temperature 12.5 degree C.  

Thus, on the basis of the formula q1 and q2 are determined,  

q1 = ΔHf × m

= 334 J/g × 54 g = 18036 J

q2 = mCΔT

= 54 × 4.184 × 12.5 = 2824.2 J

Hence, the total heat required will be q1 + q2 = 18036 J + 2824.2 J

= 20860.2 K

The mass of iron can be calculated as:  

-qmetal = qwater

-m × c × ΔT = 20860.2

-m × 0.045 × (12.5 - 85) = 20860.2

m = 6393 g or 6.39 Kg

Answer:

C2H4Cl2

Explanation:

This is the formula this might help you.

The formula for 1,1-dichloroethane is C₂H₄Cl₂, where both chlorine atoms are attached to the first carbon of the ethane molecule.

The chemical formula for 1,1-dichloroethane is C₂H₄Cl₂. In organic chemistry, the prefixes indicate the number of substituents and their positions on the carbon chain. The '1,1-' prefix means that both chlorine atoms are attached to the first carbon in the ethane molecule, which has two carbons. In 1,1-dichloroethane, both chlorines are on the same carbon atom.

Answer:

I guess it would be C.

Explanation:

because it sounds familiar

Answer:

Maryland is a Mid-Atlantic state in the United States that is characterized by abundant waterways and coastlines.

The effects of climate change in Maryland include rising sea levels, summer heat waves, and more frequent and violent thunderstorms.

These changes affect the citizens of Maryland, their livelihoods and also the economy of the state.

Answer:

4 days

Explanation:

A radioactive cloud is said Ron contain Iodine-131. It has a half-life of 8 days. If the waste must decay to a concentration of less than 0.1% to be considered safe, then it will take approximately 4 days days to reach safe levels under normal circumstances.

Answer:

100/2 ➙ 50/2 ➙  25/2 ➙  12.5/2 ➙ 6.25/2 ➙  3.13/2 ➙  1.56/2 ➙  0.78/2 ➙  0.39/2 ➙  0.195/2 ➙  0.0975

10 half lives x 8 days/half live = 80 days

Answer:

b) +2 and +3.

Explanation:

Hello,

In this case, given the molecular formulas:

[tex]XO[/tex]

And:

[tex]X_2O_3[/tex]

We can relate the subscripts with the oxidation states by knowing that they are crossed when the compound is formed, for that reason, we notice that oxygen oxidation state should be -2 for both cases and the oxidation state of X in the first formula must be +2 since both X and O has one as their subscript as they were simplified:

[tex]X^{+2}O^{-2}[/tex]

Moreover, for the second case the oxidation state of X should be +3 in order to obtain 3 as the subscript of oxygen:

[tex]X_2^{+3}O_3^{-2}[/tex]

Thus, answer is b)+2 and +3

Best regards.

In the case when the element x forms the oxides xo and x2o3 the oxidation numbers of element x are option b +2 and +3.

The equation should be X2O3.

Here we can link the subscripts with the oxidation states by knowing that they should not be linked at the time when the compound should be formed. So here the oxygen oxidation state should be -2 and the oxidation state of x should be +2.

Its like

X+2O-2

Here in the second case, the oxidation state of x should be +3 for obtaining 3 and treated as the subscript of oxygen.

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Answer:

Inflammation

Explanation:

Inflammation is the response to a cut. The blood vessels expand when you get cut to allow white blood cells to flock to the wound site. These attack any bacteria that got past the clot. If you mean excess bacteria, then that would be an infection.

The redness around a wound caused by harmful bacteria is due to inflammation, an immune response that involves blood vessel dilation, increased blood flow, and white blood cells combatting the infection.

When harmful bacteria invade a wound, the skin around the wound turns red due to a process called inflammation. This biological response is the body's second line of defense against pathogens. Inflammation is triggered by the release of chemicals when skin or other tissues are damaged. These chemicals cause blood vessels to dilate, increasing blood flow and making the area red and warm.

The influx of blood also delivers white blood cells like neutrophils to the wound site, and these cells help to combat the bacterial invaders. A well-known agent in this process is histamine, which not only contributes to the dilation of blood vessels but also helps attract immune cells to the site of injury. This inflammatory response helps to establish a physical barrier against the spread of infection and begins the process of tissue repair.

Answer:

your answer is (a) Copper Metal

Explanation:

Copper exists as a chemical element with the symbol Cu and atomic number 29. It exists as a soft, malleable, and ductile metal with very increased thermal and electrical conductivity. A freshly revealed surface of pure copper contains a pinkish-orange color.

Copper(II) nitrate represents any component of the family of inorganic compounds with the formula Cu(NO₃)₂ₓ. The hydrates exist in blue solids. Anhydrous copper nitrate includes blue-green crystals and sublimes in a vacuum at 150-200 °C. Familiar hydrates exist the hemipentahydrate and trihydrate.

Mass exists the quantity of matter in a physical body. It exists even a measure of the body's inertia, the resistance to acceleration (difference of velocity) when a net force exists applied. An object's mass also defines the strength of its gravitational attraction to other bodies.

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Answer:

2g

Explanation:

The balanced equation for the reaction is given below:

2Na + 2H2O —> 2NaOH + H2

Next, we'll determine the mass of the water (H2O) that reacted and the mass of H2 produced from the balanced equation.

This is illustrated below:

Molar Mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g

Molar Mass of H2 = 2x1 = 2g/mol

Therefore, from the balanced equation above, 36g of H2O reacted to produce 2g of H2.

From the illustration above, we can see that 36g of water will produce 2g of H2.

Answer:

I believe it is B

Explanation:

Taken from the California race voting %

Answer:

The answer is water .

Explanation:

Water is needed for a plant to photosynthesize .

Answer:

1. A

2. B

3. A

4. C

5. C

6. A

Answer:

Use stoichiometry to find your answers

Explanation:

Answer:

particles have mass unique to their substance

Explanation:

for example using cereal ->

1 Frosted mini wheat is much larger than 1 cheerio so it has a higher mass -> They are both single particles but without knowledge of their unique mass we can't convert particle number to grams!

hope this helps !! :)

The reason why it does not convert the direct number of particles to grams is that particles should have mass unique to their substance.

A particle represents the tiny piece of matter where the scientist believed that everything that was made in the universe should be of particles. It can be range in terms of size, from larger subatomic particles such as electrons to smaller microscopic particles like atoms or molecules.

Therefore,

The reason why it does not convert the direct number of particles to grams is that particles should have mass unique to their substance.

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Answer:

50.00 g of NO

Explanation:

Remember that the balanced chemical reaction equation is indispensable in solving any question that has to do with stoichiometry. Hence the first step in solving the problem is noting down the balanced chemical reaction equation.

2NO(g) + O2 (g)→ 2NO2(g)

Now we try to find out the reactant in excess. The reactant in excess gives the greater mass of product.

For O2;

From the balanced reaction equation;

32 g of O2 yields 92g of NO2

16.00g of O2 will yield 16.00×92/32 = 46g of NO2

For NO;

30g of NO yields 92g of NO2

80.00 g of NO yields 80.00 × 92/30 = 245.33 g of NO2

Hence NO is the reactant in excess.

If 1 mole of O2 reacts with 2 moles of NO2 according to the balanced reaction equation

Then 32 g of O2 reacts with 60g of NO according to the balanced reaction equation

16.00 g of O2 reacts with 16.00 × 60 /32 = 30 g of NO

Hence mass of excess reactant used in the reaction = total mass of NO- mass of NO reacted= 80.00g -30.00g = 50.00 g of NO

Hence the mass of excess reactant used in the reaction is 50.00 g of NO

Answer:

The amount in grams of the excess reactant (NO) used in the chemical reaction is 30 grams

Explanation:

The balanced chemical equation for the reaction is presented as follows;

O₂ (g) + 2NO (g) → 2NO₂ (g)

Therefore, one mole of O₂ combines with two moles of NO to produce two moles NO₂

Molar mass of oxygen gas, O₂ = 31.999 g/mol

Mass of oxygen gas, O₂, present = 16.00 g

Molar mass of nitric oxide, NO = 30.01 g/mol

Mass of nitric oxide, NO, present = 80.008

Number of moles, n, of a sample of a substance is given by the following relation;

[tex]n = \frac{Mass \ m, \, of \, sample}{Molar \, mass \, of \, sample}[/tex]

Number of moles of O₂ present is presented as follows;

[tex]n_{O_2}=\frac{16 \, g}{31.999 \, g} = 0.5 \, moles[/tex]

Number of moles of NO present is presented as follows;

[tex]n_{NO}=\frac{80 \, g}{30.01 \, g} = 2.67 \, moles[/tex]

Hence, since one mole of O₂ combines with two moles of NO to produce two moles NO₂, 0.5 moles of O₂ will combine with one mole of NO to produce one mole NO₂. Therefore, the oxygen is used up in the reaction and the nitric oxide is the excess reactant.

Number of moles of nitric oxide, NO, consumed in the reaction = 1 mole

Mass, m of nitric oxide used = number of moles of nitric oxide × molar mass of nitric oxide

∴ Mass of nitric oxide used = 1 mole × 30.01 g/mol = 30.01 grams

Rounding to the nearest whole number, we have;

Mass of nitric oxide used = 30 grams.

The amount in grams of the excess reactant (NO) used in the chemical reaction = 30 grams.

The nuclear decay of helium into lithium through the emission of an electron is called beta decay. This process changes the composition of the nucleus from helium (^6_2He) to lithium (^6_3Li), while conserving the mass number.

In this process, a neutron within the helium nucleus decays into a proton, electron (specifically, a beta particle), and an antineutrino. Since the number of protons in the nucleus increases from two to three, helium (^6_2He) is transformed into lithium (^6_3Li).

During beta decay, the element ascends one place in the periodic table, even though the mass number (top number) remains the same, as it involves only a change in the type of nucleon (neutron to proton) rather than a loss of nucleons. In this process, the emitted electron (beta particle) is represented by the symbol ^0_-1e, underscoring the fact that it has negligible mass (thus mass number 0) and a negative charge (thus -1).

The relevance of lithium-6 containing three protons, three neutrons, and three electrons is that it represents the lithium formed from the beta decay of helium-6. This lithium isotope, ^6_3Li or Li, is easily ionized due to its electron configuration, which makes lithium a typical alkali metal.

Answer:

6.22g of CaCl₂

Explanation:

Mass of HCL = 4.09g

Mass of CaCl₂ =

equation of reaction

2HCl + Ca(OH)₂ → CaCl₂ + 2H₂O

From equation of reaction, 2 moles of HCl produces 1 mole of CaCl₂

2(36.5)g of HCl = 111g of CaCl₂

73g of HCl will produce 111g of CaCl₂

4.09g of HCl will produce = x

73g of HCl = 111g of CaCl₂

4.09g of HCl = x

Cross multiply and solve for x

X = (111 * 4.09) / 73

X = 6.219g of CaCl₂ = 6.22g of CaCl₂

4.09g of HCl will produce 6.22g of CaCl₂

Answer:

1.68867925

Explanation: molarity = moles of solute divided by liters of solution so 3.58/2.12 equals 1.68867925

Answer:

1) Time (Half-Life Cycles)

2) Radioactive Adams

Explanation:

on edg

Answer:

1) Time (Half-Life Cycles)

2) Radioactive Adams

3) quite strongly

4) Radioactive decay is a random event

Explanation: edge2023

The presence of atom or molecules was proven already by scientific experiments by Rutherford, Dalton etc. There is no simple experiment by which we can prove that a substance is made of atoms. But we can observe it using Brownian motion.

There are various theories proposed by scientists regarding the structure and properties of atoms and they discovered the presence of sub-atomic particles electrons, protons and neutrons.

The presence of charged particles inside an atom is discovered by Rutherford using Gold-foil experiment. Similarly J.J Thomson discovered the electrons first.

Brownian motion is the random motion of particles which are suspended in a medium of liquid or gas. This motion is a proof of molecular vibration and thereby the presence of atoms or molecules.

By the immersing particle of inorganic matter in water we can observe the Brownian motion easily provided no external force is affected.

Therefore, in fact by these simple observations we can have a believe in atoms.

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Answer:

8 GRAMS OF OXYGEN WILL BE REQUIRED TO PRODUCE 9 GRAMS OF WATER MOLECULES.

Explanation:

The equation for the reaction is;

2 H + O2 ----> 2 H2O          

(H = 1, O = 16)

From the reaction, it can be observed that 1 mole of O2 reacts to form 2 moles of H2O

At STP, using the molar masses of the elememts and compound in the reaction, 32 g of O2 will reacts to form 36 g (18 * 2 g) of H2O

32 g of O2 = 36 g OF H2O

if 9 grams of H2O is produced, the mass of oxygen required to produce it will be:

( 32 * 9 / 36 ) g of O2

= (288 / 36) g

= 8 g of O2

So, 8 grams of Oxygen will be required to produce 9 grams of water.

Answer:

B

Explanation:

volume occupied by fixed amount of gas is directly proportional to its absolute temperature.

Final answer:

The Ideal Gas Law statement corresponding with Charles's Law is that decreasing the temperature of a gas will proportionally decrease its volume, as Charles's Law states that volume and temperature are directly proportional at constant pressure.

Explanation:

The statement about the Ideal Gas Law that is supported by Charles's Law is: B) If you decrease the temperature of a gas, its volume will decrease proportionally. Charles's Law states that the volume of a given amount of gas is directly proportional to its temperature in the Kelvin scale, assuming that the pressure is kept constant. This means that if the temperature of a gas is increased, its volume will increase as well, and conversely, if the temperature decreases, the volume will decrease.

Answer:

potential energy is answer

Explanation:

Answer:

Temperature (T1) = 954.86 K or 681.86 ° C

Explanation:

Given:

Temperature (T) = 1000° C = 1000 + 273.15 = 1,273.15 K

Volume of the piston (V) = 20 L

Volume of the piston (V1) = 15 L

Find:

Temperature (T1) = ?

Computation:

⇒ [Temperature (T) / Volume of the piston (V)] = [Temperature (T1) / Volume of the piston (V1) ]

⇒ [1,273.15 K / 20 L] =  [Temperature (T1) / 15 L]

⇒ Temperature (T1) = 954.86 K or 681.86 ° C

Using Charles's Law, which relates gas volume and temperature, it is determined that when a gas-filled piston with an initial volume of 20 L at 1000°C compresses to 15 L, the outside temperature is approximately 204.28°C.

To determine the temperature outside when the piston has a volume of 15 L, we need to use Charles's Law, which states that the volume of a gas is directly proportional to its absolute temperature when the pressure is held constant. Mathematically, Charles's Law is expressed as V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature and V2 and T2 are the final volume and temperature. Given that at 1000°C (which is 1273.15 K), the volume of the piston is 20 L, we can find the outside temperature (T2) when the volume of the piston is 15 L by rearranging the formula to T2 = (V2×T1)/V1.

Let's calculate the outside temperature:

T2 = (15 L × 1273.15 K) / 20 L
T2 = 9548.625 K / 20
T2 = 477.43125 K

To convert this back to Celsius, we subtract 273.15 from the Kelvin temperature.

T2 (in °C) = 477.43125 K - 273.15
T2 (in °C) = 204.28°C

Therefore, the outside temperature is approximately 204.28°C when the piston has a volume of 15 L.

Answer:

D) Dispersion; dispersion

Explanation:

Pentane or heptane are non-polar molecules so both of the , dispersion or london force exists as intermolecular force exists among molecules of pentane or heptane . So these bonds needs to be broken and dispersion  interaction takes place between molecules of pentane and heptane. Dispersion interaction  of AB type is stronger than AA or BB type.

Mixing of nonpolar molecules pentane and heptane results in the breaking and forming of dispersion forces, which are intermolecular forces present in such hydrocarbons.

When pentane (C5H12) and heptane (C7H16) mix, the type of intermolecular forces that must be broken are dispersion forces. Both pentane and heptane are nonpolar molecules hence the only intermolecular forces present are the weak dispersion forces or London dispersion forces. These are the instantaneous dipole-induced dipole forces that result from transient shifts in electron density. The somewhat stronger intermolecular force among nonpolar hydrocarbons is basically due to larger electrong cloud, and the only type of 'attractive forces' available for them to form when they mix are still the same - dispersion forces

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Answer:

hmm lets see    The following is the sequence of the steps from when the stimulus is received to the reaction of the body: 1. The stimulus is received by the sensory receptors. 2. Sensory neurons carry stimulus information to the brain or spinal cord. 3. The brain processes the information through interneurons.

Explanation:

Answer:

Hey wilson Its Elijah Headley Im finished with half my classes now and finna finish 3 instead o 2

Explanation:

Answer:

pH=105

Explanation:

The higher the pH, the more alkaline it is.

Answer:

milk of magnesia, pH = 10.5

Explanation:

just got it right one edge

Answer:

Explanation:

20.88L

Answer: In New York City

Explanation: I'm not a nerd but I think it would be that because when your in the middle of new York city, and you scream it echos.

Answer:

I believe it’s 4

Explanation: