A ______________________ is required to cause atoms to bond together or be separated from one another. *
a physical change
b phase change
c radioactive decay
d chemical reaction

Answer:

I mean ig it is, but i dk

Explanation:

Answer:

nonreactive

Explanation:

The ionic equation of the reaction between hydrogen sulfide and MnO4- is as follows:

5H2S + 2MnO4- + 6 H+ → 2(Mn)2+ + 8H2O + 5S

According to this question, hydrogen sulfide reduces MnO4- to Mn2+, in an aqueous solution.

Elemental sulfur is produced as a gaseous product. The net ionic equation of this reaction is as follows:

5H2S + 2MnO4- + 6 H+ → 2(Mn)2+ + 8H2O + 5S

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Answer:

Water has a chemical formula of H2O . In here, there are two hydrogen atoms and one oxygen atom, and so its mass will be 2+16=18 amu . There are two water molecules formed, and that means the total mass of the products is 18⋅2=36 amu .

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

mass = moles x molar mass

m= 3.7 x (23x2+16)

m= 3.7x62

m= 229.4g

198.4 grams are there is 3.7 moles of Na₂O.

The number of moles is defined as the ratio between given mass and molar mass.

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\)

Given:

Number of moles= 3.7 moles

To find:

Mass=?

Molar mass of Na₂O= 62 g/mol

Thus substituting the values in the given formula

\(\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}= 3.2 \text{moles}*62 \text{g/mol}\\\\\text{Given mass}=198.4 \text{g}\)

Thus, 198.4 grams are there is 3.7 moles of Na₂O.

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If the compound contains a metal cation or an ammonium cation, then the compound is ionic. Otherwise it is a molecular compound. Ionic compounds that dissociate completely in water are strong electrolytes. ... Molecular compounds that are weak acids are weak electrolytes.

CORRECT ME IF IM WRONG

HOPE IT HELPS:(

An electrolyte substances which, when dissolved in aqueous solution, dissociates into cations (+ ions) and anions (- ions).

Electrolytes can either be a weak or strong electrolyte depending on whether they can dissociate partially or completely.

Therefore, regarding the water-soluble compound X:

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The temperature of the reaction should be decreased

This change in temperature would make the equilibrium to shift to the right.

The Le Chatelier's principle, commonly referred to as the Le Chatelier's principle of equilibrium, is a chemical principle that describes how an equilibrium system reacts to environmental changes.

According to this theory, when an equilibrium system is exposed to an outside force, it will respond in a way that partially offsets the imposed change and restore equilibrium.

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The amount of \(KNO_3\) dissolved would be 1011 grams.

The mole fraction of a component of a substance is the ratio of the mole of the component relative to the mole of the whole substance.

Thus, for a mole fraction of KNO to be 0.1, it means 1 mole of KNO relative to 10 moles of KNO3.

In other words, the number of moles of \(KNO_3\) dissolved is 10 moles.

Recall that: mole = mass/molar mass, and mass = mole x molar mass

Molar mass of \(KNO_3\) = 39.1 + 14 + (16 x 3) = 101.1 g/mol

Mass of 10 moles of \(KNO_3\) = 10 x 101.1

                                             = 1011 grams

In other words, the amount of \(KNO_3\) dissolved is 1011 grams.

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Answer:

15,000 cm^3

Explanation:

Think of 1 cm^3 as a cube that has side lengths of 1 cm. We know that 1 cm = 0.1 dm, so 1 cm^3 = 0.001 dm^3.

Using dimensional analysis, or the factor-label method, 15 dm^3 x (1 cm^3/0.001 dm^3) = 15,000 cm^3.

Answer:

X = 15d / c

Explanation:

make me brainliest please?

Answer:

Explanation:

The high pressure causes cold air to move toward the low pressure areas

So c

Answer:

The minimum mass of ethylene glycol = 6.641 Kg

Explanation:

\(\Delta T_f= T_f-T_f'\\T_f'=T_f-\Delta T_f\)

Where T_f = freezing point of pure solvent water, 0°C

T_f'= Freezing point of solvent after mixture

K_f = Freezing point depression constant = 1.86 °C/m

Moecular weight of ethylene glycol = 60 g/mol

Weight of ethylene glycol = 14.5 Kg= 14.5×10^3 g

molality of ethylene glycol

\(m = \frac{weight}{mol.wt} \times\frac{1000}{V}\)

Substitute the values to calculate m

\(m = \frac{w}{60} \times\frac{1000}{14.5\times1000}\)

by formula

\(0-(-14.2) =1.86\frac{w}{60} \times\frac{1000}{14.5\times1000}\)

calculating we get w = 6641.93 g

Therefore, The minimum mass of ethylene glycol = 6.641 Kg

This problem is providing the heating curve of ethanol showing relevant data such as the initial and final temperature, melting and boiling points, enthalpies of fusion and vaporization and specific heat of solid, liquid and gaseous ethanol, so that the overall heat is required and found to be 1.758 kJ according to:

In chemistry, we widely use heating curves in order to figure out the required heat to take a substance from a temperature to another. This process may involve sensible heat and latent heat, when increasing or decreasing the temperature and changing the phase, respectively.

Thus, since ethanol starts off solid and end up being a vapor, we will find five types of heat, three of them related to the heating-up of ethanol, firstly solid, next liquid and then vapor, and the other two to its fusion and vaporization as shown below:

\(Q_T=Q_1+Q_2+Q_3+Q_4+Q_5\)

Hence, we begin by calculating each heat as follows, considering 1 g of ethanol is equivalent to 0.0217 mol:

\(Q_1=0.0217mol*111.5\frac{J}{mol*\°C}[(-114.1\°C)-(-200\°C)] *\frac{1kJ}{1000J} =0.208kJ\\ \\ Q_2=0.0217mol*4.9\frac{kJ}{mol} =0.106kJ\\ \\ Q_3=0.0217mol*112.4\frac{J}{mol*\°C}[(78.4\°C)-(-114.1\°C)] *\frac{1kJ}{1000J} =0.470kJ\\ \\ Q_4=0.0217mol*38.6\frac{kJ}{mol} =0.838kJ\\ \\ Q_5=0.0217mol*87.5\frac{J}{mol*\°C}[(150\°C)-(78.4\°C)] *\frac{1kJ}{1000J} =0.136kJ\)

Finally, we add them up to get the result:

\(Q_T=0.208kJ+0.106kJ+0.470kJ+0.838kJ+0.136kJ\\ \\ Q_T=1.758kJ\)

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Answer:

See explanation

Explanation:

Racemization is said to occur when a 1:1 ratio of (+) and (-) enantiomers of a compound are produced in a reaction.

The reaction of optically active (R)-2-methylcyclohexanone with either aqueous base or acid leads to the formation of a planar enol species for reaction with acid and a planar enolate species for reaction with base.

Both reactions involves the formation of achiral species which reverts back to the chiral product with equal chances of the formation of both enantiomers of the product during the process. This leads to racemization of the product in both cases.

Racemization of the optically active (R)-2-methylcyclohexanone results from the production and subsequent interconversion of intermediates during the reaction with an aqueous base or acid. This is due to the inversion of stereochemistry at the chiral centre.

Racemization can happen when an optically active molecule is exposed to an aqueous base or acid because the compound's enantiomers are interconverted. The carbon-carbon bond next to the carbonyl group in (R)-2-methylcyclohexanone breaks as a result of the chemical reaction with the aqueous base or acid. The creation of the negatively charged intermediate known as the enolate ion occurs when a base, such as hydroxide ions, is present and attacking the carbonyl carbon. The carbonyl group can then be reformated by this enolate ion after it has undergone a nucleophilic attack on a proton.

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Answer: The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Explanation:

The information provided demonstrates that Option B. Scientific data can be used to help support a theory of the origin of the Universe.

The discovery of background radiation coming from all directions in the sky by Penzias and Wilson supports the big bang theory, which proposes that the Universe began expanding from a small point nearly 14 billion years ago. This discovery of cosmic microwave background radiation was predicted by the big bang theory, providing strong evidence in favor of the theory.

This example also highlights the importance of empirical evidence in scientific theories. The big bang theory was proposed based on observations of the redshift of distant galaxies, and the discovery of the cosmic microwave background radiation provided further empirical support for the theory. As more data is collected and analyzed, scientific theories can be modified or replaced if the evidence does not support them. This is the essence of the scientific method, which involves formulating hypotheses based on observations and then testing them through experimentation and observation.

Therefore, scientific data plays a crucial role in supporting or disproving theories, and theories should be continually tested and modified based on new evidence. The big bang theory remains one of the most widely accepted explanations of the origin of the Universe, and it is continually being refined and modified as new data becomes available. So, Option B is Correct.

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Answer: An electron con only exist in a limited number of quantized energy levels.

Explanation:

Answer:

test her suspicion by checking to see whether other cats also make her sneeze

Answer:

When most substances lose or gain energy, one of two things happens to the substance: its temperature changes or its state changes. The temperature of a substance is related to the speed of the substance’s particles. So, when the temperature of a substance changes, the speed of the particles also changes. But the temperature of a substance does not change until the change of state is complete.

Explanation:

hope this helps,

                      noah

Cicadas are known for their broadly spaced, pronounced eyes, and short antennae.

While annual cicadas are widespread, periodicals are only found in North America. In the middle and eastern parts of the country, there are mostly periodic broods, and in some places, there are multiple broods.

Adult cicadas are black in color with green or orange-brown markings, and they have wingspans of 1 to 2 inches. They have clear wings with orange veins and big, black or red eyes. Nymphs resemble their adult counterparts in appearance, although they lack wings and are not as vividly colored.

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3.4x10^4 = 34000

3.4×104 = 3.4 ×10000 = 34×1000=34000

In linguistics, ordinal integers or ordinal digit words are terms representing place or rank in sequential ordering; the order may be of a size, significance, record, and so on (e.g., "third", "tertiary").

They vary from cardinal digits, which mean quantity (e.g., "three") and other kinds of numerals.

Thus, 34000 is the answer.

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Answer:

compound

Explanation:

Answer:

D) Refraction

Explanation:

Refraction is when something is bended or when it changes directions, such as light

The light bends or changes direction when it's being refracted. So the correct option is D.

The bending of a light ray when it's passing from one medium to another medium is called refraction. The bending of the ray is due to the differences in density between the two media.

The change in the direction of a wave when it's passing from one medium to another is defined as refraction.  This is one of the most commonly observed phenomena in nature. The working of optical instruments like magnifying glasses, lenses, and prisms is possible due to refraction.

Also, because of the refraction of light, a person can focus light on their retina and is thus able to see. Whenever a light ray travels at an angle into a medium of different refractive indices, it always refracts. This is a change in speed which results in a change in direction.

There are two laws of refraction. They state that:

                                         \(\frac{sin (i)}{ sin (r)} = constant\)

Therefore the correct option is D.

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The mass of sodium chloride produced by the chemical reaction between sodium bicarbonate and hydrochloric acid is 8.37g.

The balanced chemical equation for the reaction between sodium bicarbonate (NaHCO₃) and hydrochloric acid (HCl):

NaHCO₃ + HCl → NaCl + H₂O + CO₂

1 mole of sodium bicarbonate (NaHCO3) reacts with 1 mole of hydrochloric acid (HCl) to produce 1 mole of sodium chloride (NaCl), 1 mole of water (H₂O), and 1 mole of carbon dioxide (CO₂).

NaCl: Molar mass = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol

The number of moles of sodium bicarbonate (NaHCO₃) and hydrochloric acid (HCl) using their respective masses:

Number of moles of NaHCO₃ = Mass of NaHCO₃ / Molar mass of NaHCO₃

Number of moles of NaHCO₃ = 12 g / (22.99 g/mol + 1.01 g/mol + 48.00 g/mol + 16.00 g/mol)

Number of moles of NaHCO₃ = 12 g / 84.00 g/mol ≈ 0.143 moles

Number of moles of HCl = Mass of HCl / Molar mass of HCl

Number of moles of HCl = 5.58 g / (1.01 g/mol + 35.45 g/mol)

Number of moles of HCl = 5.58 g / 36.46 g/mol ≈ 0.153 moles

Since the reaction stoichiometry is 1:1 between NaHCO₃ and NaCl, the number of moles of NaCl produced will be the same as the number of moles of NaHCO₃ reacted. Therefore, the mass of NaCl produced can be calculated as follows:

Mass of NaCl produced = Number of moles of NaCl × Molar mass of NaCl

Mass of NaCl produced = 0.143 moles × 58.44 g/mol

The Mass of NaCl produced ≈ 8.37 g

Hence, the mass of sodium chloride produced is approximately 8.37 grams.

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Chemistry => Measurements => Metric Unit Conversions

We have a velocity value equal to 56.8m/min. Remember that velocity is defined as the distance traveled in a given time.

Now, we are asked to find the time it will take to walk 7900ft.

So we must do a conversion of units, to go from feet to meters we will take into account the following relationship

So, the distance of 7900ft in meters will be:

Now, the time that will take to cover this distance will be:

We have to express the answer with 2 significant figures.

It will take 42 minutes to cover a distance of 7900ft

Answer: 42 min

Answer:

15.32 days

Explanation:

From the question given above, the following data were obtained:

Half-life (t½) = 3.83 days

Original amount (N₀) = 225 g

Amount remaining (N) = 14.06 g

Time (t) =.?

Next, we shall determine the number of half-lives that has elapsed. This can be obtained as follow:

Original amount (N₀) = 225 g

Amount remaining (N) = 14.06 g

Number of half-lives (n) =?

N = N₀ / 2ⁿ

14.06 = 225 / 2ⁿ

Cross multiply

14.06 × 2ⁿ = 225

Divide both side by 14.06

2ⁿ = 225 / 14.06

2ⁿ = 16

Express 16 in index form with 2 as the base

2ⁿ = 2⁴

n = 4

Thus, 4 half-lives has elapsed.

Finally, we shall determine the time. This can be obtained as follow:

Half-life (t½) = 3.83 days

Number of half-lives (n) = 4

Time (t) =.?

n = t / t½

4 = t / 3.83

Cross multiply

t = 4 × 3.83

t = 15.32 days

Therefore the time for 225 g sample of Radon to decay to 14.06 g is 15.32 days

Moles of KBr = Mass/Molar mass = 10.5g/119g/mol = 0.088 mol. Now, Molarity=moles of KBrVolume of the solution in liter. M o l a r i t y = m o l e s o f K B r V o l u m e o f t h e s o l u t i o n i n l i t e r .

1200 mL will be the closing extent of the solution.

However, seeing that there may be already 500 mL of answer present, you only need to add 700 mL of water to get 1200 mL as your last volume. The answer: seven hundred mL.

QUESTION 13 What hundreds of KBr and water are wished to produce 300. g of a solution that is three p.c by using mass? 9.00 g of KBr and 300.

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Answer:

The balanced chemical equation:

3 NH₃ + H₃PO₄ → (NH₄)₃PO₄

From the equation we see:

3 moles of NH₃ gives 1 mole (NH₄)₃PO₄

0.085 mole NH₃ will gives ?? mole (NH₄)₃PO₄

By cross multiplication:

number of moles of (NH₄)₃PO₄ = 0.085 * 1/3 = 0.028 mole

Explanation: