In a neutralization reaction, there are two products: water and a [blank].

Answer:

They have like charges

Explanation:

Like charges repel, opposite charges attract

The most likely reason the comb is able to repel the balloon is that, the balloon and the comb have the same electrical charge.

The question is incomplete, the complete question is;

One student rubs a balloon against his hair several times. Another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is the most likely reason the comb is able to repel the balloon?

A.The balloon has a positive charge and the comb is neutral.

B. The balloon and the comb have the same electrical charge.

C. The balloon has a negative charge and the comb is neutral.

D. The balloon and the comb have opposite electrical charges

When the student rubs a balloon against his hair several times or another student passes a comb through her hair several times, static charges are built up on the balloon and the comb.

One of the ways by which a neutral object can be charged is by friction. That is, rubbing it against another object repeatedly.

The fact that when the students place the comb near the balloon and observe that the comb repels the balloon means that both the comb and the balloon acquired the same kind of charge after friction.

Therefore, the balloon and the comb have the same electrical charge.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question

mass of object = 45 g

volume = 9 cm³

Substitute the values into the above formula and solve

We have

\(density = \frac{45}{9} \\ \)

We have the final answer as

Hope this helps you

Answer:

the answer is B 5g/ cubic centimeters

Explanation:

to find the density you divide the mass by the volume

Answer:

1. Combine iron and copper (II) sulfate solution.  (Hint: Iron will form the iron (III) ion)

Fe + CuSO4 → FeSO4 + Cu

2. Combine lead (II) nitrate and potassium iodide solutions.

Pb(NO3)2+ Kl →  Pbl2 + 2KNO3

3. Combine magnesium metal and hydrochloric acid solution.

Mg + HCl → MgCl2 + H2

4. Electrolysis (splitting) of water.  

H2O → 2H2 + O2

5. Burning magnesium.

Mg + O2 → Mg2+O2-

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 8 cm³

density = 1.5 g/cm³

We have

mass = 8 × 1.5

We have the final answer as

Hope this helps you

Atoms have slowly become more complicated over time.

option A.

The atomic structure refers to the structure of an atom comprising a nucleus (center) in which the protons (positively charged) and neutrons (neutral) are composed within the atomic nucleus.

The atomic model has changed from Dalton to Rutherford to Bohr and Schrödinger because Atoms have slowly become more complicated over time.

The remaining options about the reason for the change of atomic model are not correct and they include;

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Answer:

1. D 2.. A 3. C 4. B

Explanation:

just took the quiz

We can classify each rock as intrusive or extrusive and basaltic or granitic as follows; Rock A - Extrusive, Basaltic, Rock B - Intrusive, Granitic, Rock C - Extrusive, Basaltic, and Rock D - Extrusive, Basaltic.

Rock A - Extrusive, Basaltic

Rock A is described as having dark-colored large grains, which indicates a fine-grained texture, typical of extrusive rocks. The presence of dark-colored large grains suggests a basaltic composition.

Rock B - Intrusive, Granitic

Rock B is described as having large crystals and a high percentage of silica, which suggests a coarse-grained texture, typical of intrusive rocks. The high silica content and large crystals indicate a granitic composition.

Rock C - Extrusive, Basaltic

Rock C is described as having a fine-grained texture and being light-colored, which are characteristic features of extrusive rocks. The fine-grained texture suggests a rapid cooling, typical of extrusive rocks, and the light color is indicative of a basaltic composition.

Rock D - Extrusive, Basaltic

Rock D is described as being from the Hawaiian volcano area and having no visible crystals. This indicates a glassy texture, typical of rapidly cooled extrusive rocks. The origin from a volcanic area and glassy texture suggest a basaltic composition.

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volume of carbon dioxide is produced in the first minute 0.56 L of CO₂

Salt, carbon dioxide, and water are produced when metal carbonate and an acid react. In order to create calcium chloride (CaCl2), carbon dioxide (CO2), and water, calcium carbonate (CaCO3) combines with hydrochloric acid (HCl) (H2O). We are aware that 22.4 L is the volume occupied by 1 mole of any gas at 0° C and 1 atm pressure.

Thus, 100 g of CaCO₃ produces 22.4 L of CO₂

So, 2.5 g CaCO₃ will form, which equals 100.

56 L of CO (2.5*22.4/100)

= 0.56 L of CO₂

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​

The total number of moles in the vessel can be calculated as follows:
n(H2) = 4.0 g / 2.016 g/mol = 1.988 mol
n(Ar) = 19.0 g / 39.948 g/mol = 0.476 mol

The total pressure in the vessel is given as 1.0 atm. We can use Dalton's law of partial pressures to find the partial pressure of argon:
P(Ar) = (n(Ar) / (n(H2) + n(Ar))) x 1.0 atm
P(Ar) = (0.476 mol / (1.988 mol + 0.476 mol)) x 1.0 atm
P(Ar) = 0.193 atm
The partial pressure of argon in the vessel is 0.193 atm.
In the given closed vessel, we have 4.0 grams of H2 and 19.0 grams of Ar at a total pressure of 1.0 atm. To find the partial pressure of argon, we first need to calculate the moles of each gas. For H2: moles = 4.0 g / 2.016 g/mol = 1.984 moles. For Ar: moles = 19.0 g / 39.948 g/mol = 0.476 moles. The mole fraction of argon (X_Ar) is calculated by dividing the moles of Ar by the total moles of both gases: X_Ar = 0.476 / (1.984 + 0.476) = 0.193. Finally, we find the partial pressure of argon (P_Ar) by multiplying the total pressure by the mole fraction: P_Ar = 1.0 atm * 0.193 = 0.193 atm.

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Answer:

Petroleum refinery capacity in the UAE 2009-2018

In 2018, the total production capacities of all refineries in the UAE were 1.13 metric barrels per day. Total total production capacity of the al-Ruwais refinery in the United Arab Emirates was approximately 817,000 metric barrels per day.

30g solution in 100 L water  is 30% NaCl by mass.

If we add 30g NaCl in 100L of water then it is 30% NaCl by mass.

\(\frac{30g}{100L}\) = 30% NaCl by mass.

A solution is a method, substance, or process that solves a problem or satisfies a need. It is the outcome of a problem-solving process that provides a solution to a specific issue or challenge. Solutions can be found in various fields such as science, technology, medicine, business, or personal life. A solution is a means of resolving a problem or difficulty. It can refer to a method, substance, or process that addresses a specific issue or challenge. A solution must be effective, efficient, and practical, taking into account the underlying causes of the problem. The goal of a solution is to provide a positive outcome that resolves the problem at hand. To be effective, a solution must be well thought out, relevant, and efficient. It must take into account the underlying causes of the problem and provide a practical and feasible way to resolve it. Ultimately, a solution must deliver positive results and be able to stand the test of time.

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Answer:

is you'r question correctly?

or not

The correct answer is Carbon Monoxide (CO). When organic matter is burned with insufficient oxygen, it leads to incomplete combustion and the production of various gases, including carbon monoxide. Carbon monoxide is a colorless, odorless gas that is extremely poisonous and can be fatal in high concentrations.Carbon dioxide (CO2) is a product of complete combustion and is not produced when there is insufficient oxygen.Benzene is a hydrocarbon compound composed of six carbon atoms and six hydrogen atoms, and it is not produced from combustion.Methane (CH4) is a hydrocarbon compound composed of one carbon atom and four hydrogen atoms, and it is not produced from combustion.Mercury is a metallic element and is not related to combustion.

Answer:

See detailed solution below

Explanation:

Now, let us solve each question step by step.

1) Given that;

N = amount of radioactive material at time t

No= amount of radioactive material originally present

t = time required for N amount of radioactive material to remain

t1/2= half life of the radioactive material

So,

N/No = (1/2)^t/t1/2

N/60 = (1/2)^22.8/3.8

N/60= (1/2)^6

N/60=1/64

64 N = 60

N = 60/64

N = 0.9 g

2) N/No = (1/2)^t/t1/2

N/8 = (1/2)^103.2/34.4

N/8 = (1/2)^3

N/8 = 1/8

8N = 8

N = 1 L

3)  N/No = (1/2)^t/t1/2

50/No =  (1/2)^18/6

50/No =  (1/2)^3

50/No = 1/8

No = 50 * 8

No = 400 micrograms

4)  N/No = (1/2)^t/t1/2

62.5/500 =  (1/2)^26/t1/2

0.125 = (1/2)^26/t1/2

Since 0.125 = 1/8

1/8 =  (1/2)^26/t1/2

(1/2)^3 = (1/2)^26/t1/2

Hence;

3 = 26/t1/2

t1/2 = 26/3

t1/2 = 8.7 hours

The molar solubility of CaF₂ should be 6.4 × 10⁻¹⁰ M in order to dissolve in 3 litres of 0.150 M NaF solution.

Calculation of the molar solubility:

Here

CaF2 will dissociate should be

CaF2 ⇌Ca²⁺+ 2F⁻

where,

1 mole of Calcium ion (x)

2 moles of fluorine ion (2x)

Now

NaF will also dissociate like

NaF ⇌ Na⁺ + F⁻

Here

Na⁺ = 0.25M

F⁻ = 0.25M

Now

Ksp = {Ca²⁺}{F⁻}²

Ksp = {x}{0.25}²

4.0 × 10⁻¹¹= 0.25⁻²× x

4.0 × 10⁻¹¹ = 0.0625x

x = 4.0 ×  10⁻¹¹ ÷ 6.25 × 10⁻²

x = 4/6.25 × 10⁻⁹

x = 0.64 × 10⁻⁹

x = 6.4 × 10⁻¹⁰

Therefore, the molar solubility of CaF₂ in NaF solution is 6.4 × 10⁻¹⁰M

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Answer:

28.69 grams

Explanation:

To find the mass, we first need to find the moles. Once we have the moles, it is easy to use the molar mass of H2SO4 to find its mass.

To find the moles, remember that molarity (M) is equal to the moles divided by the volume (L). The volume HAS TO be converted to liters!

M = moles / V

5.85 M = moles / 0.05 L

moles = 0.2925

Now we know that we have 0.2925 moles of sulfuric acid. The molar mass of sulfuric acid is 98.08 g/mol.

0.2925 moles * (98.08 g / mol) = 28.69 grams

Make sense? If you have any questions, don't hesitate to ask!

Answer:

If a linear graph has a negative slope then dependent value decreases in value as the independent variable increases. The line with negative slope is sloping down to the right

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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The chemical and biological indicators of water quality are substances that are used to measure the quality of water.

These indicators help to identify the presence of pollutants and other contaminants in water. Some common chemical indicators of water quality include pH, dissolved oxygen, total dissolved solids, and salinity. pH is a measure of the acidity or alkalinity of water, and can indicate the presence of pollutants such as acid rain.

Dissolved oxygen levels can indicate the level of organic matter in the water, while total dissolved solids can indicate the presence of pollutants such as salt. Salinity levels can indicate the presence of pollutants such as chloride.

Biological indicators of water quality include the presence of bacteria, viruses, and other microorganisms. These indicators can help to identify the presence of pathogens that can cause disease in humans and other animals. Some common biological indicators of water quality include fecal coliform bacteria, E. coli, and Giardia.

The presence of these organisms in water can indicate the presence of pollutants such as sewage or animal waste.

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Answer:

The total number of atoms in this chemical formula

C8H3 NaBr 12

8+3+1+12=24

It is therefore an ionic compound, if NaCl is made up Na and Cl ions.

NaCl is an ionic solid. It dissociates into \(Na^{+}\) and \(Cl^{-}\) ions when it dissolves in water. By creating ion-dipole interactions, water molecules solvate these ions. The chemical equation for the dissociation of sodium chloride into \(Na^{+}\) ions and \(Cl^{-}\) ions when salt is dissolved in water is:

NaCl (s) → \(Na^{+} (aq) + Cl^{-} (aq)\)

As a result, adding salt to water causes a chemical change. The products differ from the reactant (sodium chloride, or NaCl), which (sodium cation and chlorine anion). Therefore, a chemical change would occur in any ionic molecule that is soluble in water.

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Answer:

the answer is 4

Explanation:

i took the test and got it right and i would recommend using quizlet it has these flash cards and the answers are there you just click on the one that says your question and it will say your answer on the back. It helps with most of my test! Hope this helps (:

The Grignard reagent is prepared in excess relative to the aldehyde because the Grignard reagent is fragile, and some may be lost to moisture.

By using an excess, it ensures that there is enough reagent present to react with the aldehyde, leading to the desired product. The Grignard reagent is prepared in excess relative to the aldehyde for two main reasons. Firstly, preparing the Grignard is the purpose of the experiment, and having an excess ensures that there is enough to react with all of the aldehyde.

Secondly, the Grignard reagent is fragile and some may be lost to moisture during preparation or storage. By preparing an excess, there is a greater chance that enough reagent will remain to react with the aldehyde. Additionally, the Grignard reagent is typically more expensive to prepare than the aldehyde, so using an excess may not be cost-effective, but it is necessary to ensure a successful reaction.

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Answer:

Y AND Z

HOPE IT HELPS THANK ME LATER.

Answer:

B. Y and Z

Explanation:

Answer:

2.35 M

Explanation:

Molarity is mol/L of solution. We have to convert the g to mol and the mL to L. G to mol uses the molar mass of the compound. The molar mass of NaNO₃ is 85.00g/mol.

\(50.0gNaNO3*\frac{1molNaNO3}{85.00gNaNO3} = 0.588molNaNO3\)

Then you have to convert mL to L.

\(250mL*\frac{1L}{1000mL} = 0.250L\)

Now divide the mol by the L.

\(\frac{0.588mol NaNO3}{0.250L} = 2.352 M\)

Round to the smallest number of significant figures = 2.35M

Answer:

the different isotopes vary in their relative abundance in nature

The electron configuration of Helium (He) is 1s², which means that it has two electrons in its outermost shell.

Helium is an inert gas and, like hydrogen, it also emits a line spectrum when it is energized.Helium has a more complex spectrum than hydrogen because it has more electrons.

As a result, it emits more lines than hydrogen. Helium has two electrons, which implies that it will have twice the number of lines than hydrogen.

The emission spectrum of helium will have more lines than that of hydrogen because helium has more electrons.

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Answer:

Force Is a Vector Quantity that measures both direction and magnitude of a push or pull on an object.

Explanation:

The formula for Force= Mass × Acceleration. And when applying force, there is a direction at which the body is focused on. Hope this helps

Answer:

(Question 1) Which statement best describes force?

(Answer) Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.

(Question 2) A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?

(Answer) The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.

(Question 3) Which of the following scenarios accurately describes magnitude and direction?

(Answer) A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.

(Question 4) What is force directly proportional to?

(Answer) the acceleration and mass of an object

(Question 5) Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?

(Answer) The box exerts 10 N of force downward.

Explanation:

just did the Quick Check UwU Enjoy

Answer:

thermal energy

Explanation: