16.30 rounded to the nearest hundredth of a gram

As per the given data, the specific heat of the copper sample is approximately 0.384 J/g·°C.

For the specific heat of copper, we can use the formula:

q = mcΔT

Given that:

Mass of copper (m) = 5g

Change in temperature (ΔT) = 50°C - 10°C = 40°C

Heat absorbed (q) = 76.8 J

76.8 J = 5g × c × 40°C

76.8 J = 200g°C × c

c = 76.8 J / 200g°C

c ≈ 0.384 J/g·°C

Thus, the specific heat of the copper sample is approximately 0.384 J/g·°C.

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Answer:

6.273×10²³

Explanation:

hope this is useful friend

Answer:

6.023 × 10²³

Explanation:

Avogadro's number is used for calculating masses and moles and can applied to Stoichiometry. Avogadro's number is useful for atoms and molecules

Answer:

by washing your hands

keeping distance if its a contagious disease

eat well

Since all species appear on both side of the ionic equation, there was no reaction.

Same ions present in both side of complete ionic equation are omitted to write net ionic equation. These ions are called the spectator ions.

first step - write down molecular equation as follows:

Al(C2H3O2)3(aq) + 3LiNO3 (aq) --> 3Li(C2H3O2)(aq) + Al(NO3)2(aq)

second step - write complete ionic equation;

Al3+ (aq) + 3(C2H3O2)^- (aq) + 3Li^+(aq) + 3N03^-(aq) -----> 3Li^+(aq) + 3(C2H3O2)^-(aq) + Al^3+(aq) + 3N03^-(aq)

You can see that all ions that appeared on the left hand side of the reaction equation also appeared on the right hand side of the reaction equation, thus thet are omitted. Hence there was no reaction.

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Answer:

a) 3rd Law of Motion

Explanation:

When two plates collide (or) interact with each other it is known as 3rd Law of Motion. Hence, option (a) is correct.

The correct answer is option C.  if you are looking for a non-dairy alternative to get the same amount of calcium as 8 oz of nonfat milk, canned sardines can be an excellent option.

which is 1.5 oz of canned sardines. Nonfat milk contains approximately 300 milligrams of calcium per 8-ounce serving. Sardines are an excellent source of calcium and a 1.5-ounce serving of canned sardines contains around 325 milligrams of calcium, which is equivalent to the calcium content in 8 ounces of nonfat milk.

Option A, 4.9 oz plain, nonfat yogurt, contains around 150 milligrams of calcium, which is less than half the amount present in 8 oz of nonfat milk. Option B, 4.9 oz Swiss cheese, contains around 270 milligrams of calcium, which is slightly less than the amount present in 8 oz of nonfat milk. Option D, 1 cup of lima beans, contains around 32 milligrams of calcium, which is a significantly lower amount than what is present in 8 oz of nonfat milk.

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Without the necessary information about the reaction equation and equilibrium constant, it is not possible to calculate the equilibrium concentration of PH3.

To calculate the equilibrium concentration of PH3, we need to know the balanced equation for the decomposition of PH3BCl3 and the equilibrium constant (K) for the reaction. The equilibrium constant relates the concentrations of reactants and products at equilibrium.

Without this information, we cannot determine the equilibrium concentration of PH3. The temperature of 80 °C is provided, but it alone is not sufficient to calculate the equilibrium concentration.

Additionally, the nature of the solid sample and its decomposition process is not clear. Understanding the specific reaction and its equilibrium conditions is crucial for accurate calculations.

In the absence of the reaction equation and equilibrium constant, it is not possible to calculate the equilibrium concentration of PH3 in the given scenario. Further information is needed to perform the calculation accurately.

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You are referring to a process known as diffusion.

The movement of molecules from a region with a greater concentration to one with a lower concentration is known as diffusion. The random mobility of molecules in a liquid, like water, causes this movement to take place.

. In this process, molecules move down their concentration gradient, which means they move from regions where they are more concentrated to regions where they are less concentrated.

Diffusion is a passive process that does not require any additional energy input. It plays a crucial role in various biological processes, such as the exchange of gases in the lungs, the absorption of nutrients in the digestive system, and the release of waste products by cells.

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Explanation:

Carbohydrates provide 4 calories per gram, protein provides 4 calories per gram, and fat provides 9 calories per gram.

Ref www.nal.usda.gov

Answer:

\(\huge\boxed{\sf 160\ g}\)

Explanation:

Here,

Half life = 3

Sample Amount left = 20 g

Before 3rd half-life:

= 20 × 2

= 40 g

Before 2nd half-life:

= 40 × 2

= 80 g

Before 1st half-life:

= 80 × 2

So, the initial amount of sample was 160 grams.

\(\rule[225]{225}{2}\)

The pH of a solution containing 0.085 M nitrous acid (HNO2; Ka = 4.5 x 10-4) and 0.10 M potassium nitrite (KNO2) can be calculated using the principles of acid-base equilibrium.

1. The solution will be slightly acidic, and the pH value can be determined by the concentration of H+ ions resulting from the ionization of nitrous acid.

2. The pH of the solution can be calculated by considering the ionization of nitrous acid and the hydrolysis of the nitrite ion. Nitrous acid (HNO2) partially ionizes in water to form hydronium ions (H3O+) and nitrite ions (NO2-). This ionization can be described by the equation: HNO2 ⇌ H+ + NO2-.

3. The equilibrium constant for this reaction is given by the acid dissociation constant (Ka) for nitrous acid, which is 4.5 x 10-4. Since the concentration of HNO2 is 0.085 M, we can assume that x moles of HNO2 ionize, resulting in x moles of H+ ions and x moles of NO2- ions. Therefore, the concentration of H+ ions can be approximated as x M.

4. The nitrite ions (NO2-) from the potassium nitrite (KNO2) can undergo hydrolysis in water to produce hydroxide ions (OH-) according to the reaction: NO2- + H2O ⇌ HNO2 + OH-

5. Since the concentration of KNO2 is 0.10 M, we can assume that x moles of NO2- ions hydrolyze, resulting in x moles of HNO2 and x moles of OH- ions. Therefore, the concentration of OH- ions can be approximated as x M.

6. To determine the pH, we need to calculate the concentration of H+ ions in the solution. Since the reaction of nitrous acid and the hydrolysis of nitrite ions occur simultaneously, we need to consider their combined effect on the concentration of H+ ions. The net effect will depend on the relative magnitudes of the ionization constant (Ka) and the hydrolysis constant (Kw).

7. In this case, the concentration of nitrous acid (0.085 M) is much greater than the concentration of nitrite ions (0.10 M), indicating that the ionization of nitrous acid is dominant. Therefore, the concentration of H+ ions can be approximated as x M.

8. To calculate x, we can use the expression for the acid dissociation constant (Ka) of nitrous acid: Ka = [H+][NO2-] / [HNO2]

Substituting the known values, we get:

4.5 x 10-4 = x * x / (0.085 - x)

9. Solving this equation will yield the value of x, which represents the concentration of H+ ions. From there, we can calculate the pH using the formula pH = -log[H+].

10. In summary, the pH of the solution can be calculated by considering the ionization of nitrous acid (HNO2) and the hydrolysis of nitrite ions (NO2-). The equilibrium between these reactions will determine the concentration of H+ ions, which in turn determines the pH value. The concentration of H+ ions can be approximated by assuming that the dominant reaction is the ionization of nitrous acid due to its higher concentration compared to nitrite ions. By solving the relevant equations, the concentration of H+ ions can be determined, and the pH of the solution can be calculated using the formula pH = -log[H+].

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The thickness of the foil in millimeters when a sheet of aluminium foil has a total area of 1.000 and a mass of 3.636 g is 0.01346 mm.

Mass of aluminum foil, m = 3.636 g ; Density of aluminum, ρ = 2.699 g/cm³ ; Area of aluminum foil, A = 1.000

Thickness of aluminum foil, t = ?

Formula used :

Mass per unit area, μ = m / A

Thickness = Mass / (Density × Area)

Thickness of aluminum foil, t = m / (A * ρ)

Calculation :

Mass per unit area, μ = m / A

μ = 3.636 g / 1.000 cm²

Thickness of aluminum foil, t = m / (A * ρ)

t = 3.636 g / (1.000 cm² * 2.699 g/cm³)t = 1.346×10⁻³ cm = 0.01346 mm

Therefore, the thickness of the aluminum foil is 0.01346 mm.

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Answer:

True

Explanation:

|ndeed,  Psychologist Abraham Maslow's sought to describe hierarchy in which the average (or most) humans place their needs. In other words, he believes we as humans have basic needs which we long to satisfy.

On the ranking or hierarchy, according to Maslow the need humans satisfy first is their physiological need. Here's the full hierarchy:

Physiological Needs

↓

Safety Needs

↓

Love/Belonging Needs

↓

Esteem Needs

↓

Self-Actualization

Answer:

Step-1:write the reaction.

HCl+NaOH ----->NaCl+H₂O

Step-2:In the left side, we have

H

Cl

Na

O

Explanation:

It would take an additional 10 minutes (20 minutes total) to reach 75% conversion.

A liquid decomposing by first-order kinetics means that the reaction rate is directly proportional to the concentration of the reactant.

In a batch reactor, the reaction occurs without any addition or removal of reactants/products during the process.

Given that 50% of reactant A is converted in 10 minutes, we can use the first-order kinetics equation:

ln([A]0/[A]) = kt

where [A]0 is the initial concentration, [A] is the final concentration, k is the rate constant, and t is the time.

For 50% conversion:

ln(2) = k(10 minutes) For 75% conversion: l

n(1/ (1 - 0.75)) = ln(4) = k(t)

Since k is the same in both cases, we can set the equations equal: ln(2) / 10 minutes = ln(4) / t

Solving for t: t = (ln(4) / ln(2)) × 10 minutes = 20 minutes

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Answer:

chalk bubbles with vinegar

Answer:

fitness. the ability of an organism to survive and reproduce in its environment. adaptation. the inherited characteristic that increases an organism's chance of survival.

An inherited characteristic of an organism is called a heredity.

The term heredity refers to the genetic heritage passed down by our biological parents. It is the transmission of traits from one generation to another generation. These traits can be physical, such as eye colour, blood type or a disease, or behavioral.

Heredity is also called biological inheritance, is the exiting of of traits from parents to their offspring either through asexual reproduction or sexual reproduction.

Heredity is a process in which organisms develop characteristics from their parents. These characteristics are called traits. Inheritance is the transmission of information from one generation of individuals to the next.

Thus, An inherited characteristic of an organism is called a heredity.

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Arrhenius :

acid: a compound that releases H⁺ ions in water

base: a compound that releases OH⁻ ions in water

H2S Arrhenius acid

RbOH Arrhenius base.

Mg(OH)2  Arrhenius base.

H3PO4 Arrhenius acid

Answer:

Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

Explanation:

103,000lbs/day of alum need (Al₂(SO₄)³·14 H₂O) are required for a 45 MGD water treatment plant that requires an optimum dosage of 25 ppm Al³⁺ for coagulation.

If the optimum dosage for coagulation is 25 ppm Al³⁺ and the water treatment plant has a flow rate of 45 MGD (million gallons per day), we can calculate the amount of alum required per day as follows:
25 ppm Al³⁺ x 45 MGD = 1,125 pounds of Al₂(SO₄)³·14 H₂O per day
However, the molecular weight of Al₂(SO₄)³·14 H₂O is 594.1 g/mol, which means that 1 mole of Al₂(SO₄)³·14 H₂O weighs 594.1 grams. Therefore, we need to convert pounds to grams by multiplying by a conversion factor of 453.592 grams per pound:
1,125 pounds/day x 453.592 grams/pound = 510,837 grams/day
Finally, we can convert grams to pounds per day by dividing by 453.592 grams per pound:
510,837 grams/day ÷ 453.592 grams/pound = 1,126.4 pounds/day (rounded to the nearest tenth)
Therefore, approximately 1,126.4 pounds per day of alum (Al₂(SO₄)³·14 H₂O) are required for a 45 MGD water treatment plant that requires an optimum dosage of 25 ppm Al³⁺ for coagulation. Rounded to the nearest thousandth, this is approximately 103,000 pounds per day.

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Answer:

This reaction is the synthesis of Ammonia using Nitrogen and Hydrogen gas.

N+H→NH3

We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to

N2+H2→NH3

Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently, we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

N2+3H2→2NH3

This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

Explanation:

I hope this was helpful.

SMARTERTEACHER

Answer:

Balance the equation N2 + H2 ⇒ NH3

Balancing chemical equations is usually easier than it looks

There are 2 Nitrogens and 2 Hydrogens on the left side

There are 1 Nitrogen and 3 Hydrogens on the right side

Hydrogen seems to be the more complicated term so we should start with that

_N2 + _H2 ⇒ _NH3

With 2 H on one side and 3 on the other, our common multiple is 6

To balance the H we need to multiply H2 by 3 and NH3 by 2

_N2 + 3H2 ⇒ 2NH3

Now that we have H balanced, we need to look at N

There are 2 Nitrogens on both sides of the equation, so in this case, it is done

Note that the items are matched accordingly:

The items listed appear to be related to welding, specifically oxyacetylene welding, which uses a mixture of oxygen and acetylene gas to create a flame hot enough to melt and join metal.

The tank contains the gases, and the oxyacetylene outfit refers to the equipment used to control and mix the gases.

The neutral flame is used for welding, while the goggles protect the welder's eyes. Teflon is a material used to coat welding surfaces, and compression is involved in the welding process.

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Answer:

The reaction will proceed in the reverse direction

Explanation:

Now consider the equation;

CaCO3(s) ⇄CO2(g) + CaO(s)

This is a reversible reaction. The reaction could proceed in either the forward or the reverse reaction depending on the conditions of the reaction. Under certain conditions, the forward reaction is favoured, under certain conditions, the reverse reaction is favoured.

The direction in which the reaction proceeds depends on the desired products as the equilibrium position could be manipulated at will by altering the reaction conditions. If the desire is to produce more CaCO3, then the equilibrium position is manipulated so that it shifts towards the left hand side. This implies that the reverse reaction is favoured.

Answer:

Los padres transmiten rasgos o características, como el color de ojos y el tipo de sangre, a sus hijos a través de sus genes. Algunas condiciones de salud y enfermedades también pueden transmitirse genéticamente. A veces, en

Compound B is nonpolar, compounds C and E are polar, compounds A and D are amphiphilic.

Amphiphilic molecules are what?

An amphiphilic molecule is any substance that has two separate covalently bonded parts with contrasting solvent affinities, where one half has a strong affinity for nonpolar solvents and the other part has a high affinity for polar solvents (like water).

What polar and nonpolar molecules?

Polar molecules are created when the bonded atoms have differing electronegativities. Nonpolar molecules are created when the polar bonds in a larger molecule cancel each other out or when the electrons in a diatomic molecule are equally distributed among the atoms.

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Metals and nonmetals usually form ionic compounds, whereas two bonded nonmetals are never ionic because of their electronegativity difference.

Electronegativity is the measure of an element's tendency to attract bonding electrons towards itself. Metals are usually electropositive, meaning they have fewer electrons in their outer shell, while nonmetals are usually electronegative, meaning they have more electrons in their outer shell than metals.

The electronegativity difference between a metal and a nonmetal is usually high, resulting in ionic bonding. The electrons of the metal are transferred to the nonmetal, forming ions. For example, sodium (Na) and chlorine (Cl) react to form an ionic compound, sodium chloride (NaCl). The Na atom gives its outer electron to the Cl atom to form Na+ and Cl- ions respectively. This transfer of electrons produces a stable arrangement of ions.

In contrast, the electronegativity difference between two nonmetals is usually low, leading to covalent bonding. In covalent bonding, the atoms share their outer electrons to form a stable molecule. For example, H2O is a covalent compound, where two hydrogen atoms and an oxygen atom share their outer electrons to form a molecule.

Hence, the two bonded nonmetals never form ionic compounds.

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