1-An object starts moving at 7 m/s in the direction of this and then 14 seconds later moves to
42 m/s What is the average acceleration?

Answer:

151.87dm³

Explanation:

Given parameters:

Volume of hydrogen gas  = 6.78mole

Unknown:

Volume of hydrogen gas formed at STP  = ?

Solution:

To solve this problem;

   1 mole of a gas at STP  = 22.4dm³ So;

   6.78 mole of gas  = 6.78 x 22.4  = 151.87dm³

Answer:

A. They stay close together and vibrate in place

Explanation:

Particles never stop moving so, even if we pack them into a solid, they will still vibrate.

Answer: A

Explanation:

i just took the quiz and it was right!

The two correct answers for risks involved in both underground mining and surface mining are Ground instability and Respiratory disease.

Ground instability: Both underground mining and surface mining can be susceptible to ground instability, which can lead to cave-ins, landslides, or collapses.

Respiratory disease: Both types of mining can expose workers to dust and harmful particles, which can cause respiratory diseases such as pneumoconiosis (e.g., coal workers' pneumoconiosis) or silicosis.

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Choosing location in supply chain is 4) All of the above.

Choosing location in the supply chain is one of the main strategic decisions that organizations have to make, itt depends on various factors such as demand and supply forecasting, aggregate planning, and inventory management. An appropriate location enables the firms to provide quality goods and services at the right time and place. The location strategy should consider several factors such as proximity to suppliers, customers, labor availability, transportation, etc.The location decision is important for the success of a business as it affects the cost of production, customer service, and market responsiveness. When a location is chosen, it affects the transportation and inventory cost.

Therefore, firms should consider the tradeoffs between the inventory carrying cost and the transportation cost when choosing a location. For instance, a firm may decide to locate closer to the customers to reduce the transportation cost but will have to incur higher inventory carrying cost due to the storage facilities. Hence, organizations need to carefully choose the best location in the supply chain that meets the needs of their customers and ensures their long-term success. Hence, the correct option is 4) All of the above.

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The new temperature of the gas inside the balloon : 609 °C

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

\(\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\)

The balloon is heated, causing it to expand (pressure constant) :

V₁=1.9 L

T=21+273=294 K

V₂=5.7 L

\(\tt T_2=\dfrac{T_1\times V_2}{V_1}\\\\T_2=\dfrac{294\times 5.7}{1.9}\\\\T_2=882 K=609 ^oC\)

Answer: I do believe it shows variables.

Explanation:

According to the information provided, a chemical reaction results in the release or energy absorbed.

The correct option is B. Energy is either released or absorbed.

What is chemical reaction and example?

Reactants go through a chemical process and turn into product through a chemical reaction in a chemical reaction. For instance, the combination of oxygen and glucose in human breath results in the production of dioxide, water, and energy. A range of sectors benefit from and benefit from the contribution that chemistry makes to their development and growth. They include businesses in the glass, cement, paper, textiles, leather, and dye industries. Chemical is also widely used in sectors like paint, pigments, petroleum, sugar, polymers, and medicines.

Why do chemical reactions occur?

Chemical reactions occur when atoms form or break chemical bonds. The molecules that start a chemical reactions are known as reactants, and the molecules that are produced as a result of a reaction are known as products.

Therefore, the correct answer about chemical reaction is that in chemical reactions, energy is either released or absorbed.

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Cepheid variables and RR Lyrae stars are both pulsating stars that astronomers use as standard candles to measure cosmic distances.

However, Cepheids are brighter and have longer periods than RR Lyrae stars. This means that they can be seen farther away and used to measure distances to more distant galaxies than RR Lyrae stars. In fact, a typical Cepheid variable is about 100 times brighter than a typical RR Lyrae star. This means that Cepheids can be used to measure distances up to tens of millions of light-years, while RR Lyrae stars are only useful for distances within our own galaxy and nearby galaxies. The use of Cepheids as distance-measuring tools has been crucial for the study of the large-scale structure and evolution of the universe.

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Answer:

91.49 grams

Explanation:

No of molecules = no of moles × Avogadro's number

No of moles = No of molecules / Avogadro's number

Number of moles = 5.4×10^23/6.02×10^23

Number of moles = 0.897 moles of Al2O3

Number of moles = mass in gram / molar mass

Mass in gram = number of moles× molar mass

Mass in gram = 0.897× 102

91.49 grams

Answer:

1. Q: How does a phase change from solid to liquid occur in a substance?

A. Heat energy is added to the substance, weakening the electrical attraction between molecules.

2. Q: How do weak intermolecular bond strengths affect the melting and boiling point of a substance?

A: Both the melting point and boiling point are lower.

3. Q: Which term or phrase represents a separation of charges in a molecule, resulting in partial positive and partial negative charges?

A: Dipole

4. Q: Which statement explains why water and ethanol have different boiling points?

A: Water and ethanol have different molecular structures

5. Q: Which statement describes the hydrogen and oxygen atoms in water?

A: The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.

Explanation:

Did it

The statement which best describes the hydrogen and oxygen atoms in

water is that the lone pairs of electrons in the oxygen atom causes the

molecule to be bent; the oxygen atom has a partial negative charge, while

the hydrogen atoms have partial positive charges.

Water is a compound which comprises of the elements hydrogen and

oxygen. They  share electrons in the covalent bond present between the

atoms. The sharing of electrons isn't equal which is why it has a bent

structure.

The oxygen atom has a partial negative charge, while the hydrogen atoms

have partial positive charges present in the compound.

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Answer:

I know the answer

Explanation:

attraction helps its capacity

hope it may helps you

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Answer:

C

Explanation:

because it is product over reactants. hope this helps :)

The equilibrium expression for the reaction C(s) +\(O_{2}\)(g) ⇄ \(CO_{2}\) (g) will be

[\(CO_{2}\) ] / [ \(O_{2}\) ].

Chemical equilibrium is a state where no net change in the quantities of reactants as well as products takes place during a reversible chemical reaction.

The given reaction is C(s) +\(O_{2}\)(g) ⇄ \(CO_{2}\) (g) .

It is known that solid phase is not considered in equilibrium.

Hence, equilibrium expression = [\(CO_{2}\) ] / [ \(O_{2}\) ].

Therefore, the correct answer will be option (D).

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Answer:

Venus is very hot because of the clouds that surround it.  It is roughly the same size as Earth, it is just a little smaller.  Venus is a rocky planet and has a lot of volcanoes.

That's all I know, you might have to research it. :/

Answer:

The difference between "no-rub" and "easy rub" multipurpose contact lens solutions lies in the way they are used for cleaning contact lenses. Let's understand this concept in detail:

What is a contact lens?

A contact lens is a medical device that is worn on the cornea of the eye. It is used for vision correction or for therapeutic purposes. There are different types of contact lenses such as soft lenses, hard lenses, and hybrid lenses. Soft lenses are made up of hydrophilic (water-loving) material that can absorb water and retain moisture.

What is a multipurpose contact lens solution?

Multipurpose contact lens solution is a type of solution that is used to clean and disinfect contact lenses. It is an all-in-one solution that is used for cleaning, rinsing, disinfecting, and storing contact lenses. It is an easy and convenient way to clean contact lenses as it eliminates the need for multiple solutions for cleaning different types of contact lenses. It also saves time and money as it is a cost-effective solution for contact lens users.

What is a "no-rub" multipurpose contact lens solution?

A "no-rub" multipurpose contact lens solution is a type of solution that is used to clean and disinfect contact lenses without the need for rubbing. It is a gentler way to clean contact lenses as it eliminates the need for vigorous rubbing that can damage soft contact lenses. It is an ideal solution for people who have sensitive eyes or are prone to eye infections.

What is an "easy rub" multipurpose contact lens solution?

An "easy rub" multipurpose contact lens solution is a type of solution that is used to clean and disinfect contact lenses with the need for gentle rubbing. It is a more effective way to clean contact lenses as it removes debris and protein build-up that can cause eye infections and discomfort. It is an ideal solution for people who wear contact lenses for long hours and are exposed to environmental pollutants and allergens.

In conclusion, the difference between "no-rub" and "easy rub" multipurpose contact lens solutions is the way they are used for cleaning contact lenses. The "no-rub" solution is a gentler way to clean contact lenses, while the "easy rub" solution is a more effective way to clean contact lenses. Both solutions are safe and effective for cleaning contact lenses.

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Answer:

Kc = [CaO] [O2] / [CaCO3]

Explanation:

Equilibrium constant, Kc is simply defined as the ratio of the concentration of products raised to their coefficient to the concentration of the reactants raised to their coefficient.

Thus, we can write the equation for the equilibrium constant, Kc for the reaction given in the question above as follow:

CaCO3(s) <==> CaO(s) + O2(g)

Kc = [CaO] [O2] / [CaCO3]

Answer:

its the third one

Answer:

V₂ = 46.34 mL

Explanation:

Given data:

Initial temperature = 273 K

Initial volume = 50.0 mL

Final temperature = 253 K

Final volume = ?

Solution:

The given problem will be solve through the Charles Law.

Charles Law

"The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure"

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

by putting values in formula,

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 50.0 mL × 253 K / 273 k

V₂ = 12650 mL.K / 273 K

V₂ = 46.34mL

The amount of work done on the system during the compression of the gas is 18,243 joules.

To calculate the amount of work done on the system during the compression of a gas, we can use the formula:

Work (W) = -PΔV

Where:

W is the work done on the system,

P is the constant pressure, and

ΔV is the change in volume.

Given:

Initial volume (V1) = 20.0 L

Final volume (V2) = 2.0 L

Pressure (P) = 10.0 atm

The change in volume can be calculated as:

ΔV = V2 - V1

= 2.0 L - 20.0 L

= -18.0 L (since the volume decreases)

Now we can substitute the values into the formula:

W = -PΔV

= -(10.0 atm) * (-18.0 L)

= 180.0 atm * L

To convert from atm * L to joules, we need to use the conversion factor:

1 atm * L = 101.325 J

So, we can multiply the result by the conversion factor:

W = 180.0 atm * L * (101.325 J / 1 atm * L)

= 18,243 J

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The amount of drink that needs to evaporate to reach a drinkable temperature will vary based on the specific circumstances.

To determine how much of the drink must evaporate for it to reach the drinkable temperature, we need more information about the specific drink and its initial temperature. However, in general, evaporation is a cooling process as it removes heat from the liquid. So, if a drink is initially too hot, some of it will need to evaporate for it to reach a drinkable temperature. The amount that needs to evaporate depends on factors such as the volume and temperature of the drink, as well as the desired drinkable temperature. To calculate the specific amount, you would need to consider the heat transfer properties of the liquid, the surrounding environment, and the time available for evaporation. In conclusion, the amount of drink that needs to evaporate to reach a drinkable temperature will vary based on the specific circumstances.

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The process of injecting small amounts of air into the vial at a time to prevent leaking is called milking.

Milking is a process used to withdraw liquid from a vial without allowing air to enter the syringe, which can cause the formation of air bubbles or contamination of the sample.

It involves injecting small amounts of air into the vial at a time to create a positive pressure that forces the liquid out. This is particularly important when dealing with viscous or volatile liquids that are prone to clogging or evaporation.

To milk a vial, the needle is inserted into the septum at an angle and a small amount of air is injected into the vial. This is repeated until the desired volume of liquid is withdrawn.

Milking is a common technique used in various scientific applications, including analytical chemistry, biotechnology, and pharmaceutical research, where precise and accurate liquid handling is crucial.

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Answer:  28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)   

\(\text{Moles of} Al=\frac{15.0g}{27g/mol}=0.556moles\)

The balanced chemical equuation is:

\(4Al+3O_2\rightarrow 2Al_2O_3\)  

According to stoichiometry :

4 moles of \(Al\) produce == 2 moles of \(Al_2O_3\)

Thus 0.556 moles of \(Al\) will produce=\(\frac{2}{4}\times 0.556=0.278moles\)  of \(Al_2O_3\)

Mass of \(Al_2O_3=moles\times {\text {Molar mass}}=0.278moles\times 102g/mol=28.4g\)

Thus 28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal.

The concentration of sulfate ion would be required for Ca⁺ to begin to precipitate out as calcium sulfate is 7.10 * 10⁻⁴ M.

b) The concentration of the Ba²⁺ ion would be 9.929 * 10⁻² M

The precipitation of calcium sulfate occurs when the ionic product, Kip is greater than or equal to the solubility product, Ksp of calcium sulfate.

a) The equation of the dissociation of CaSO₄ is given below:

CaSO₄ ⇄ Ca²⁺ + SO₄²⁻

Ksp = [Ca²⁺] * [SO₄²⁻] = 7.10 * 10⁻⁵

Kip = [Ca²⁺] * [SO₄²⁻]

[SO₄²⁻] = Kip/[Ca²⁺]

[Ca²⁺] = 0.100 M

For precipitation to occur;

Kip = Ksp = 7.10 * 10⁻⁵

[SO₄²⁻] = 7.10 * 10⁻⁵/0.100

[SO₄²⁻] = 7.10 * 10⁻⁴ M

Therefore, the concentration of sulfate ion would be required for Ca⁺ to begin to precipitate out as calcium sulfate is 7.10 * 10⁻⁴ M.

b) The concentration of the Ba²⁺ ion would be;

0.100 M - 7.10 * 10⁻⁴ M = 9.929 * 10⁻² M

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a. When the fabric strip was treated with the Test Identification Stain, it underwent a chemical reaction that caused a color change.

b. This dye can be used in forensic science to identify different types of fibers or to determine if a particular fabric was present at a crime scene.

When the fabric strip was treated with the Test Identification Stain, it experienced a change in color as the stain reacted with the fibers in the fabric. This color change indicates the presence of specific components or substances within the fabric.The dye in the stain reacted with the fibers of the fabric, resulting in a visible color change.

The dye can be used as a diagnostic tool to identify and distinguish between various types of fibers, materials, or even contaminants in the fabric. By observing the color change and comparing it to known standards, you can gain valuable information about the composition and properties of the fabric.

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