18) Identify a characteristic of halogens.A) forms water in reactionsB) absorbs water in reactionsC) powerful reducing agentsD) powerful oxidizing agentsE) inert

From thermal comfort point of view, thick walled structures are beneficial in hot and humid climates is the statement that is true.The correct option is C.

Thick walled structures are beneficial in hot and humid climates from the thermal comfort point of view.How do thick walled structures help in hot and humid climates - In hot and humid climates, thick walls tend to absorb the heat present in the environment. This absorption helps to keep the interior of the structure cool.

Additionally, thick walls take more time to heat up and more time to cool down. Thus, in hot and humid climates, thick walls are a better choice than thin walls because they provide thermal comfort.

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Answer:

A. Lithium and Bromine (LiBr)

Explanation:

Ionic bonds are chemical compounds formed between a metal and nonmetal. Lithium is a metal and Bromine is a nonmetal, therefore they would combine to produce an ionic bond.

- Oxygen and Hydrogen are both nonmetals, therefore they cannot produce an ionic bond when combined.

- Carbon and Oxygen are both nonmetals, therefore they cannot produce an ionic bond when combined.

- Nitrogen and Fluorine are both nonmetals, therefore they cannot produce an ionic bond when combined.

Answer:

0.172 M

Explanation:

Answer:

13.3 mL

Explanation:

To make a 1.00 M solution of HCl from a 15.0 M concentrated solution, we can use the dilution formula:

M1V1 = M2V2

∴ M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

We are given:

M1 = 15.0 M (concentrated HCl solution)

V1 = unknown

M2 = 1.00 M (desired final concentration)

V2 = 200 mL (desired final volume)

Plugging in these values, we get:

15.0 M x V1 = 1.00 M x 200 mL

Simplifying and solving for V1, we get:

V1 = (1.00 M x 200 mL) / 15.0 M

V1 = 13.3 mL (rounded to three significant figures)

Therefore, we need to measure 13.3 mL of concentrated HCl and then add enough water to bring the total volume up to 200 mL to make a 1.00 M solution.

The mass percent of the solute in the solution can be calculated using the formula:

Mass percent = (mass of solute / total mass of solution) x 100%

In this case, the mass of the solute is 3.90 g and the mass of the solvent is 13.7 g. Therefore, the total mass of the solution is:

Total mass of solution = Mass of solute + Mass of solvent
Total mass of solution = 3.90 g + 13.7 g
Total mass of solution = 17.6 g

Now, substituting these values in the formula, we get:

Mass percent = (3.90 g / 17.6 g) x 100%
Mass percent = 22.2%

Therefore, the mass percent of the solute in the solution is 22.2%.

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Answer:

Of the outlined, a robot moves. responds to stimuli from control system and dies.

Explanation:

Living things have the following basic characteristics:

Movement (R)

Reproduce (N)

Nutrition (N)

Irritability (R)

Grow (N)

Excrete(N)

Respire (N)

Die (N)

I hope this was helpful.

Answer:

18 neutrons

Explanation:

In the element;

         ₁₇Cl

The number of electrons in the chlorine atom is 17.

The mass number of chlorine is 35.

  Mass number is the number of protons plus number of neutrons.

 Mass number  = Protons + neutrons

      Neutrons  = mass number  - protons

Number of protons in chlorine is 17;

 So;

         Neutrons   = 35 - 17  = 18

Answer:

10

Explanation:

a centimeter and a milimeter differ from each other by a factor of 10

Answer: 10

Explanation:

Answer:

Explanation: its cold, so energy is being released to try to reach equal temp with the outside area of the cold pack

Answer:

Newton's Second Law

Explanation:

Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

(I'm going to assume this is an option, but please let me know if it's not!)

If the initial amount of radionuclide is 50 mci and the half-life is 75 days. Then, the activity remaining after 200 days is approximately 2.19515 mCi.

To determine the activity remaining after a certain time, we can use the radioactive decay equation;

A = A₀ × \((1/2)^{(t}\) / T₁/₂)

Where; A is the remaining activity after time t

A₀ is the initial activity

T₁/₂ is the half-life of the radionuclide

Given; A₀ = 50 mCi (millicuries)

T₁/₂ = 75 days

t = 200 days

Plugging in the values into the equation, we get;

A = 50 mCi × (1/2)²⁰⁰ / 75)

Calculating this expression, we find;

A ≈ 50 mCi × 0.043903

A ≈ 2.19515 mCi

Therefore, the activity remaining after 200 days will be 2.19515 mCi.

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Answer:

?

Explanation:

Answer:

0.659 M NaCl

Explanation:

Equation: Molarity = moles of solute / liters of solution

1. To find moles of solute:

78.0 g NaCl x 1 mol NaCl / 58.44 g NaCl

= 1.334 mol NaCl

2. Calculate molarity

Transfer 2,025 mL to L

1.334 / 2.025 = 0.659 M NaCl (rounded)

The molarity of the sample of seawater that contains 78.0 grams of NaCl in 2,025 mL of solution is 0.66M.

The molarity of a solution can be calculated by dividing the number of moles by its volume.

However, the number of moles of the substance can be calculated as follows:

no of moles = 78g ÷ 58.443g/mol

no of moles = 1.335mol

molarity = no of moles ÷ volume

molarity = 1.335mol ÷ 2.025L

molarity = 0.66M

Therefore, the molarity of the sample of seawater that contains 78.0 grams of NaCl in 2,025 mL of solution is 0.66M.

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The lysosome is the organelle that is formed when an endosome, containing hydrolytic enzymes necessary for the digestion of the materials, reaches a low pH of approximately 4.5.

Lysosomes are sac-like vesicles with single membranes that enclose hydrolytic enzymes that can break down biomolecules. Lysosomal enzymes work best in acidic environments and thus the pH of the lysosome is around 4.5, which is slightly acidic. The formation of lysosomes begins with the formation of endosomes.

Endosomes form through the process of endocytosis. In endocytosis, the cell membrane invaginates and surrounds a portion of the extracellular fluid, thereby forming a small vesicle, called a primary endosome. Primary endosomes mature into late endosomes by fusing with other primary endosomes or with other vesicles.

Late endosomes then mature into lysosomes by undergoing changes in the structure of their membranes that facilitate the mixing of hydrolytic enzymes with the material to be digested. In summary, lysosomes are organelles that contain hydrolytic enzymes that can break down biomolecules.

They form when endosomes reach a low pH of approximately 4.5. The formation of lysosomes begins with the formation of endosomes that mature into late endosomes and then into lysosomes. The pH of lysosomes is acidic, around 4.5.

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In an emergency, the best method of contacting help in your community is to call the local emergency services number, such as 911 in the United States.

This will connect you to a dispatcher who can send police, fire, or medical assistance to your location as needed. Make sure to provide clear and accurate information about the situation, your location, and any relevant details to ensure a timely and effective response from the emergency services.

Stay calm and follow any instructions given by the dispatcher until help arrives.

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1. ENDOTHERMIC
2. EXOTHERMIC
3. ENDOTHERMIC
4. EXOTHERMIC
5. INPUT OF HEAT ENERGY
6. ENDOTHERMIC
7. EXOTHERMIC

Answer to question 3:
Q = (200g) x (1 cal/g°C) x (100.0°C - 24.0°C) = 15200 calories

Answer to question 6:
The can filled with water should have the greatest change in temperature after five minutes.

Answer to question 7:
Cork would be the best choice for an insulator as it has low thermal conductivity and can trap air pockets, which helps to slow down the transfer of heat.
1. Endothermic processes:
- Dry ice (CO2) subliming
- The input of heat energy
- Vaporizing a block of iron
- Ice melting

2. Exothermic processes:
- Condensing of H2O on the side of a glass
- Water freezing
- Soot being deposited on the walls inside a chimney
- The release of heat energy

Question 5:
To calculate the heat required, use the formula q = m x C x ΔT.
q = 200g x 1 cal/g x (100°C - 24°C) = 200g x 1 cal/g x 76°C = 15,200 calories. So, the answer is 15200 calories.

Question 6:
The can with iron filings should have the greatest change in temperature after five minutes, as metals generally have a higher conductivity and lower specific heat capacity.

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A neutral atom of the element with 15 electrons is phosphorus with a ground state electron configuration of 1s2 2s2 2p6 3s2 3p3. It is classified as a nonmetal element in group 15. The atoms of this element are diamagnetic, as all electrons are paired up in their orbitals.

A neutral atom is an atom that has an equal number of protons and electrons. In the case of this certain element with 15 electrons, its ground state electron configuration would be 1s2 2s2 2p6 3s2 3p3.

This means that the first shell (n=1) has 2 electrons, the second shell (n=2) has 8 electrons, and the third shell (n=3) has 5 electrons.

Based on its position in the periodic table and the number of valence electrons it has, the element with this electron configuration is phosphorus. Phosphorus is a nonmetal element that belongs to group 15, also known as the nitrogen group.

To determine whether the atoms of this element are diamagnetic or paramagnetic, we need to look at its electron configuration. In this case, we can see that all the electrons are paired up in their respective orbitals, meaning there are no unpaired electrons.

This makes the element diamagnetic, which means it does not have a magnetic field of its own and will not be attracted to a magnetic field.

In summary, a neutral atom of the element with 15 electrons is phosphorus with a ground state electron configuration of 1s2 2s2 2p6 3s2 3p3. It is classified as a nonmetal element in group 15. The atoms of this element are diamagnetic, as all electrons are paired up in their orbitals.

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Al2 (SO4)3 + H2 + H2SOy 2 Al mass = 1.105 g,

2 Al molar mass = 26.98 g/mol,

and 2 Al moles = 1.105 / 26.98 = 0.041 moles.

KOH concentration is 1.4 M.

KOH's volume is 52.2 mL, or 0.0522 L, and its moles are 1.4 x 0.0522, or 0.07308 moles.

2Al + 2 KOH + 4 H2SO4 + 22H2O2KAI concentration of H2SO4 = 9.0 M volume of H2SOy = 21.8 ml = 0.0218 L moles of H2SO4 = 9.0 X 0.0218 = 0.1962 moles (SO4).

Aluminum contains the fewest number of moles, 12 H2O + 3 H2.

Reagent is constrained by aluminum.

A 2 mole Al creates a 3 mole H2 from the aforementioned reaction. In other words, 0.041 moles of Al generate 0.041 x 1.5 moles of H2, or 0.0615 moles of H2.

H2 quantity equals moles times molar mass.

= 0.0615 x 2g

Amount of H₂ produced = 0.123g

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Answer:

because the water brings a cool breeze when the wind blows

Explanation:

It attempts to explain the idea that:C. energy is quantized

To find out how many meters the skydiver fell, you can use the formula:

distance = speed x time

distance = 10 m/s x 15 seconds

distance = 150 meters

Therefore, the skydiver fell 150 meters during his 15-second fall.

Speed is a scalar quantity that describes how fast an object is moving. It is typically measured in units of distance per time, such as meters per second (m/s) or kilometers per hour (km/h).

Speed is different from velocity, which is also a measure of an object's movement, but velocity is a vector quantity and it describes an object's speed in a certain direction. Speed is the magnitude of velocity and it's a scalar quantity which only describes how fast an object is moving without considering direction. The formula for speed is distance traveled divided by the time it takes to travel that distance.

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A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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Answer:

The answer is designing an experiment

Explanation:

Since we already have a hypothesis, we need to test the hypothesis and this is done by designing an experiment that will do this test.

Answer:

inclined plane ; is that device.

Answer:

A volcanic eruption occurs when molten rock, ash and steam pour through a vent in the earth's crust. Volcanoes are described as active (in eruption), dormant (not erupting at the present time), or extinct (having ceased eruption; no longer active).

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Answer:

d. NH4+ and C2H3O2- ions

Explanation:

When ammonium acetate (NH4C2H3O2) is mixed with water, it dissociates into its ions. In this case, it dissociates into NH4+ (ammonium ion) and C2H3O2- (acetate ion). Therefore, the solution will contain NH4+ and C2H3O2- ions dissolved in water.

The solution contains NH4+ and C2H302 ions. Among the given options, the correct answer is option d. It forms a solution containing NH4+ and C2H302 ions that are fully dissolved in the water.

When a chemist mixes ammonium acetate into 500 mL of water, the ammonium acetate (NH4C2H3O2) dissolves and dissociates into its constituent ions. This results in the formation of NH4+ ions (ammonium ions) and C2H3O2- ions (acetate ions) in the solution. Ammonium acetate is a salt that readily dissolves in water, dissociating into NH4+ and C2H302 ions. The aqueous solution will contain NH4+ ions and C2H3O2- ions, which are formed due to the dissociation of ammonium acetate in water. These ions will be dispersed throughout the solution and will not sink to the bottom.

In conclusion, when ammonium acetate is mixed into water, it forms a solution containing NH4+ and C2H302 ions that are fully dissolved in the water.

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Answer:

• Note that dissolving rate is known as solubility

• Increase in particle size:

• Increase in temperature:

• Increase in concentration:

• Increase in agitation [ high water concentration ]:

\(.\)

In the given reaction 2H2(g) + O2(g) ⇋ 2H2O(g), the equilibrium will shift in response to the following changes: (a) chilling the equilibrium mixture to a temperature at which steam liquefies, (b) adding water to the system, and (c) decreasing the concentration of hydrogen. The direction of the equilibrium shift will vary depending on the Le Chatelier's principle, which states that a system at equilibrium will respond to external changes to minimize the effect of those changes.

(a) If the equilibrium mixture is chilled to a temperature at which steam liquefies, the forward reaction, which produces water vapor, will be favored. The system will shift in the direction of the products (2H2O) to counteract the decrease in temperature.

(b) When water is added to the system, the equilibrium will shift in the direction of the reactants (2H2 and O2) to counteract the increase in water concentration. The system will produce more reactants to restore the equilibrium.

(c) If the concentration of hydrogen is decreased, the equilibrium will shift in the direction of the reactants to compensate for the loss of hydrogen. The system will produce more hydrogen gas (2H2 and O2) to restore the equilibrium.

Overall, the direction of the equilibrium shift depends on the specific change imposed on the system and the goal of minimizing the impact of that change by producing more of the reactants or products as necessary to maintain equilibrium.

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The mass of the copper with a volume of 9.5 mL is approximately 84.74 g. Among the given options, the closest value to 84.74 g is option B) 85 g.

To calculate the mass of the copper, we can use the formula:

mass = density × volume

Given that the density of copper is 8.92 g/mL and the volume of the copper is 9.5 mL, we can substitute these values into the formula:

mass = 8.92 g/mL × 9.5 mL

Calculating the mass:

mass = 84.74 g

Therefore, the mass of the copper with a volume of 9.5 mL is approximately 84.74 g.

Among the given options, the closest value to 84.74 g is option B) 85 g.

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