20 pts :p will mark brainliest too.

c) are often metals

liquids are fairly good thermal conductors while gases and things like wood and plastic foam are poor conductors of heat.

Thermal conductors have high thermal conductivity and are usually metals because they have free electrons that are efficient at transferring heat. Latent heat is not a direct measure of thermal conductivity. Thus, it can be stated that thermal conductors have high conductivity (option A).

Thermal conductors are materials that have a high ability to transfer heat through them. Among the multiple-choice options provided, the correct answers that accurately define thermal conductors are:

A. have high conductivity - Thermal conductors have high thermal conductivity, meaning they can efficiently transfer heat.

C. are often metals - Most metals, such as copper and aluminum, are good examples of thermal conductors due to the presence of free electrons which facilitate the transfer of heat.

In the context of the options provided related to latent heat, the most appropriate option is A (have high conductivity) which is a characteristic of a thermal conductor. Latent heat primarily concerns the heat absorbed or released during phase changes, not thermal conductivity.

When we speak about materials' thermal properties, we often refer to conductors and insulators. Good electrical conductors, which are typically metals, are also known to be good heat conductors due to the free movement of electrons that transport thermal energy.

Answer:

The wind energy and solar energy have their own benefits when producing electricity but one of their major drawbacks is that both these energy form depends on the environmental conditions and cannot be stored.

On the other hand, in hydroelectric pumped storage, water is stored in the form of gravitational potential energy. If not enough water is there to produce electricity, then this stored water can be run over turbines to produce electricity. Hence, this is one benefit of hydroelectric pumped storage over wind and solar energy.

Answer:

These pumps allow the energy to be saved for future use, whenever the load increases.

Explanation:

Pumped-storage hydropower (PSH) is a type of hydroelectric energy storage. It is a configuration of two water reservoirs at different elevations that can generate power (discharge) as water moves down through a turbine; this draws power as it pumps water (recharge) to the upper reservoir.

PSH capabilities can be characterized as open-loop—where there is an ongoing hydrologic connection to a natural body of water—or closed-loop, where the reservoirs are not connected to an outside body of water.

Answer:

91.62 C

Explanation:

Q  =  ( m ) ( Csh ) ( T2 - T1 )

T2  = T1  +  ( Q ) / ( m ) ( Csh )

T2  =  98.8 C  +  ( - 7500 J ) / ( 250 g ) ( 4.186 J/g - C )

T2  =  91.6 C

The final temperature of the water is approximately [tex]\(91.624 \, ^\circ \text{C}\).[/tex]

To calculate the final temperature of the water, we'll use the heat transfer equation:

Q = [tex]mc\Delta T[/tex]

Given values:

m = 250g (mass of water)

c = [tex]1 \, \text{cal/g}^\circ \text{C}\)[/tex] specific heat capacity of water)

Q = -1794 cal (negative because heat is lost)

Now, we'll rearrange the formula to solve for [tex]\(\Delta T\)[/tex] :

[tex]\[\Delta T = \frac{Q}{mc}\][/tex]

Substitute the values:

[tex]\[\Delta T = \frac{-1794 \, \text{cal}}{(250 \, \text{g})(1 \, \text{cal/g}^\circ \text{C})}\][/tex]

Now, calculate [tex]\(\Delta T\)[/tex]:

[tex]\[\Delta T \approx -7.176 \, ^\circ \text{C}\][/tex]

The negative sign indicates a decrease in temperature, which makes sense since heat was lost.

Now, find the final temperature [tex](\(T_{\text{final}}\))[/tex] :

[tex]\[T_{\text{final}} = T_{\text{initial}} + \Delta T\][/tex]

[tex]\[T_{\text{final}} = 98.8 \, ^\circ \text{C} - 7.176 \, ^\circ \text{C}\][/tex]

[tex]\[T_{\text{final}} \approx 91.624 \, ^\circ \text{C}\][/tex]

So, the final temperature of the water is approximately [tex]\(91.624 \, ^\circ \text{C}\)[/tex].

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Answer: The Molarity of the sulphate ion in a 2M  [tex]K_2SO_4[/tex] solution is 2M

Explanation:

Molarity is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n= moles of solute

[tex]V_s[/tex] = volume of solution in ml

[tex]K_2SO_4\rightarrow 2K^{+}+SO_4^{2-}[/tex]

Now as 1 mole of [tex]K_2SO_4[/tex] gives = 1 mole of [tex]SO_4^{2-}[/tex]

2 moles of [tex]K_2SO_4[/tex] gives =[tex]\frac{1}{1}\times 2=2[/tex] moles of [tex]SO_4^{2-}[/tex]

Thus Molarity of the sulphate ion in a 2M [tex]K_2SO_4[/tex] solution is 2 M

Answer:

4050 mL

Explanation:

Given data:

Mass of glucose = 150.1 g

Molarity of solution = 0.205 M

Volume of solution = ?

Solution:

Molarity  = number of moles of solute / L of solution.

Now we will calculate the moles of sugar first.

Number of moles = mass/ molar mass

Number of moles = 150.1 g/ 180.156 g/mol

Number of moles = 0.83 mol

Now we will determine the volume:

Molarity  = number of moles of solute / L of solution.

0.205 M = 0.83 mol / L of solution.

L of solution = 0.83 mol / 0.205 M

L of solution = 4.05 L

L to mL conversion:

4.05 L × 1000 mL / 1 L = 4050 mL

Answer:

Q = 1569 j

Explanation:

Given data:

Mass of water = 5.00 g

Initial temperature = 25.0°C

Final temperature = 100°C

Cp = 4.184 j/g.°C

Energy needed = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT =  100°C - 25°C

ΔT =  75°C

Q = 5 g× 4.184 j/g.°C×75°C

Q = 1569 j

Answer:

Periods indicate that a new period at a new principal energy level which is filled with electrons. Groups indicate that the elements share similar properties because their shells are filled with the same number of valence electons.

Explanation:

We see that starting at period 2 Li has a  +1 charge , He has +2 charge, B has +3 charge, C has the potential to have a +4 charge or -4 charge (because it can gain or loose electrons) and N has a -3 charge, etc. Groups however, have similar properties and every element in a 1A - 8A has the same number of valence electrons. All except the noble gases in which He only needs 2 electrons to be in a perfect state. This is its octet as it would be a completely different element if it had more than 2 electrons in its shell. An example of the groups sharing similar properties is if we were to look at group 1A. In group 1A we find H, Na, K, etc. These are all highly unstable elements when alone (not in a compound) and they are very reactive. If you were to put Na for instance in water, it would light up and you'd see a flame sitting on top of the water. A scientist could do that with the rest of the elements in the group and they would see this increasing in reactivity as you go down the periods. Francium isn't visible long enough to be able to see this happen though. It's more of that kind of element that scientists prove that it exists, but not a very common element to get to learn much about.

Final answer:

Periods indicate electron shells, while groups represent elements with similar chemical properties.

Explanation:

The periods in the periodic table, which are the horizontal rows, indicate the energy levels or electron shells of the elements within them. As you move across a period from left to right, the number of protons and electrons in the elements increases by one, leading to periodic changes in properties.

The groups in the periodic table, which are the vertical columns, represent elements with similar chemical properties. Elements within the same group have the same number of electrons in their outermost shell, leading to similar reactivity and chemical behavior.

54.03 moles of gas were left the next morning, assuming the temperature and volume of the tank stayed constant.

Explanation:

Status of the oxygen gas at night or initial conditions.

volume of the tank = 70 litre

temperature = 27 degree celsius or 300.15 K

pressure = ?

number of moles of oxygen = 119

R = 0.0821 L atm/mole K

applying gas law

PV = nRT

P = [tex]\frac{0.0821 X 119.4 X 300.15}{70}[/tex]

P  = 42 atm

in the morning

volume  = 70 litres

temperature = 300.15 K

Pressure = 19 atm

n = ?

R =  0.0821 L atm/mole K

Applying  Ideal Gas law,

PV= nRT

putting the values in the formula:

n = [tex]\frac{19 X 70}{0.0821 X 300.15}[/tex]

 n  = 54.03 moles will be left in the morning.

Answer: malaria

Explanation:

Answer:

malaria

Explanation:

Answer:

stars and lightning are both made of plasma.

Lightning and stars both consist of plasma, the 'fourth state of matter' that includes a significant number of electrically charged particles. Stars are essentially balls of glowing plasma, while lightning is a rapid discharge of energy that forms plasma.

Lightning and stars both have something important in common - they are made of plasma. Plasma is often referred to as the 'fourth state of matter,' distinct from solid, liquid, or gas. It is an ionized gas, which means it contains a significant number of electrically charged particles—positive ions and negative electrons.

Stars, including our sun, are essentially massive balls of glowing plasma. On the other hand, lightning is a dramatic natural phenomenon generated when electrical charges separate within a cloud and cause a rapid discharge of energy, also forming plasma. This results in a bright flash of light and an accompanying shock wave that we hear as thunder. Thus, the primary similarity between lightning and stars is their plasma composition.

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7 valence electrons

Explanation:

Answer:

7

Explanation:

because it is in group 17 so you would use the 2nd digit and that would be 7!

Answer:

The Oxygen Atom

Explanation:

The oxygen atom in a water molecule has the greatest electronegativity. Therefore, the correct option is option C.

The tendency of an atom of a particular chemical element could attract shared electrons while forming a chemical bond is represented by the symbol. The electronegativity of an atom is determined both by its atomic number as well as the distance between its valence electrons and the charged nucleus.

The higher the related electronegativity, the more electrons an atom or substituent group attracts. Electronegativity is a simple approach to quantify bond energy as well as the sign and degree of a bond's molecular polarity, that describes a bond all along continuum between covalent through ionic bonding. The oxygen atom in a water molecule has the greatest electronegativity.

Therefore, the correct option is option C.

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Answer:a weak acid and a weak base

Explanation:

Answer:

its not 2H+ + 2OH- -> H20

Explanation

answer is A on ed2020

The net ionic equation for the reaction between Ca(OH)2 and H2SO4 is; 2OH^-(aq) + 2H^+(aq) ----->2H2O(l).

The net ionic equations shows the ions that underwent a change in te cause of the reaction. Hence, the net ionic equation would always exclude the spectator ions.

In this case, the net ionic equation is; 2OH^-(aq) + 2H^+(aq) ----->2H2O(l). The calcium and the sulfate ions are spectator ions.

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Answer:

A

Explanation:

they pull apart if u see the first one they go like this < > leaving a gap in the middle

In type A of plate boundary, a trench will most likely to form ocean trenches are caused by tectonic activity, which is the movement of the Earth's lithosphere, hence option A is correct.

Oceanic trenches are long, narrow, noticeable topographic depressions on the ocean bottom. They are normally 50 to 100 kilometers broad and 3 to 4 kilometers below the surrounding marine bottom, but can stretch for thousands of km.

Ocean trenches, in particular, are a hallmark of convergent plate boundaries, when two or more tectonic plates collide.

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Answer:

They break down the plants and animals they eat.

Explanation:

Consumers are the organisms which feed on plants and animals for obtaining energy. The carbon which is present in plant body in the form of glucose which is made in the process of photosynthesis. When these plants are eaten by consumers, the carbon which present in plants are transferred into the animal's body. This carbon is removed from the body of consumer in the process of cellular respiration and again goes to the atmosphere.

Answer:

1025.05

Explanation:

1calories=4.184 joulse

so if multiply 245 by 4.184

The calculation of energy from calories to joules is determined below:

One Joule may be defined as the amount of energy that is significantly required to be exerted when a force of one newton is put in an application over a displacement of one meter.

The calorie may be defined as the amount of heat needed at a pressure of 1 atm in order to enhance that temperature of 1 gram of any solution by 1°C.

According to the question,

The total amount of calories = 245.

As per the common calculation or conversion factors,

1 calorie ≅ 4.2 Joules.

∴ 245 calories = 245 × 4.2 = 1029 Joules.

Therefore, according to the calculation, the total amount of energy in 245 Calories is equal to 1029 joules.

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Answer:

1.8 × 10⁻¹⁶ mol  

Explanation:

(a) Calculate the solubility of the Sr₃(PO₄)₂

Let s = the solubility of Sr₃(PO₄)₂.

The equation for the equilibrium is

Sr₃(PO₄)₂(s) ⇌ 3Sr²⁺(aq) + 2PO₄³⁻(aq); Ksp = 1.0 × 10⁻³¹

                         1.2 + 3s          2s

[tex]K_{sp} =\text{[Sr$^{2+}$]$^{3}$[PO$_{4}^{3-}$]$^{2}$} = (1.2 + 3s)^{3}\times (2s)^{2} = 1.0 \times 10^{-31}\\\text{Assume } 3s \ll 1.2\\1.2^{3} \times 4s^{2} = 1.0 \times 10^{-31}\\6.91s^{2} = 1.0 \times 10^{-31}\\s^{2} = \dfrac{1.0 \times 10^{-31}}{6.91} = 1.45 \times 10^{-32}\\\\s = \sqrt{ 1.45 \times 10^{-32}} = 1.20 \times 10^{-16} \text{ mol/L}\\[/tex]

(b) Concentration of PO₄³⁻

[PO₄³⁻] = 2s = 2 × 1.20× 10⁻¹⁶ mol·L⁻¹ = 2.41× 10⁻¹⁶ mol·L⁻¹

(c) Moles of PO₄³⁻

Moles = 0.750 L × 2.41 × 10⁻¹⁶ mol·L⁻¹ = 1.8 × 10⁻¹⁶ mol

To calculate the amount of PO4^3- present at equilibrium, we can use the stoichiometry of the reaction and the amount of Sr3(PO4)2 added. Since the reaction has a 1:2 stoichiometry, the amount of PO4^3- is twice the amount of Sr3(PO4)2 added. The amount of Sr3(PO4)2 added can be calculated using the molarity and volume of the Sr(NO3)2 solution.

To calculate the amount of PO43- present at equilibrium, we need to use the concept of solubility product constant (Ksp) and the stoichiometry of the reaction.

First, let's write the balanced equation for the reaction:

Sr3(PO4)2(s) → 3Sr2+(aq) + 2PO43-(aq)

According to the stoichiometry of the reaction, 1 mole of Sr3(PO4)2 produces 2 moles of PO43-. Therefore, if we have excess Sr3(PO4)2, all Sr3(PO4)2 will dissolve and the amount of PO43- at equilibrium is equal to twice the amount of Sr3(PO4)2 added.

Since we have 750 mL of 1.2 M Sr(NO3)2, we can calculate the amount of Sr3(PO4)2 added:

750 mL * 1.2 mol/L = 900 mol Sr2+

Therefore, the amount of PO43- present at equilibrium is 2 * 900 mol = 1800 mol.

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Final answer:

Given her prolonged and unprotected exposure to UV light from the sun and tanning beds, it is very likely that Mary will develop some form of skin cancer. Sunburns and the use of tanning beds significantly increase the risk of skin cancer by damaging the DNA in skin cells and causing abnormal cell growth.

Explanation:

The story of Mary's repeated and unprotected exposure to the sun and her use of tanning beds highlights a significant health concern. Given the information, it is very likely that Mary will end up with some form of skin cancer. Ultraviolet (UV) light from the sun and tanning beds can damage the DNA in skin cells, leading to abnormal cell growth and potentially cancerous tumors. Skin cancer is classified into various types, including melanoma, basal cell carcinoma, and squamous cell carcinoma, with varying degrees of severity and treatment modalities. Mary's small sores on her arms and shoulders could be early signs of skin cancer, emphasizing the importance of protective measures against UV radiation, such as wearing sunscreen with a high SPF, wearing protective clothing, and avoiding excessive sun exposure and the use of tanning beds.

Options like HIV/AIDS, bacterial infection, and Parkinson's disease are unrelated to the described behavior and symptoms. Skin cancer is directly linked to the conditions described in Mary's case, making it the most likely outcome of her prolonged and unprotected exposure to UV radiation.

Answer: 0.4 moles

Explanation:

Given that:

Amount of moles of HCI = Z (let unknown value be Z)

Volume of HCl = 500.0 mL

Convert 500.0 mL to liters

If 1000ml = 1L

500.0 mL = (500.0 mL/1000mL) = 0.5L

Molarity of HCl solution = 0.200M

Recall that molarity of a solution is obtained by dividing the amount of moles by volume in liters

i.e Molarity = Amount in moles/volume

0.200M = Z x 0.5L

Z = 0.200M / 0.5L

Z = 0.4 moles

Thus, 0.4 moles of HCl is needed to make the solution

Final answer:

The pH of Sprite with a [H+] concentration of .000045 M is approximately 4.35, which is calculated using the formula pH = -log([H+]).

Explanation:

To calculate the pH of Sprite, which has a hydrogen ion concentration [H+] = .000045 M, we use the formula pH = -log([H+]). By inserting the given concentration into this formula, we find that pH = -log(.000045). Using a calculator to perform this logarithm results in a pH of approximately 4.35.

This calculation demonstrates the acidic nature of Sprite, as a pH lower than 7 indicates an acidic solution. The understanding of pH is crucial in chemistry to determine the acidity or basicity of a solution.

Answer:A substance's molar mass is calculated by multiplying its relative atomic mass by the molar mass constant (1 g/mol). The molar mass constant can be used to convert mass to moles. By multiplying a given mass by the molar mass, the amount of moles of the substance can be calculated.

Explanation:

Answer: molar mass

Explanation:

Mole = mass/molar mass

Mass = molar mass × mole

Answer:

1.61 × 10⁶ kJ

Explanation:

The human burns energy so as to be healthy.

The amount of energy burnt per day by an adult human is 2 × 20³ kcal per day. Since there is 24 hours in a day, the amount of energy burnt per hour is 2 × 20³ × 24 = 48 × 20³ kcal per hour.

The conversion rate of kcal to kJ is 1 kcal = 4.184 kJ. Therefore converting the kcal per hour to kJ per hour gives:

48 × 20³ × 4.184 = 200.882 × 20³ kJ = 1.61 × 10⁶ kJ

Final answer:

Rate in kJ per hour = 34.93 kJ/hTo convert the rate from kcal per day to kJ per hour, you can multiply the average daily energy burn by the conversion factor of 4.184 kJ/kcal and 1 day/24 hours.

Explanation:

To convert kcal to kJ, we can multiply by a conversion factor of 4.184.

Therefore, to find the rate in kJ per hour, we can multiply the average daily energy burn by the conversion factor for both kcal to kJ and hours to days.

The calculation would be:

Rate in kJ per hour = (2.00x10³ kcal/day) x (4.184 kJ/kcal) x (1 day/24 hours)

The rate in kJ per hour = 34.93 kJ/h

Answer:

Sound energy is a form of energy that can be heard by humans.

Ex- buzzing bee, balloon popping

Explanation:

Answer:

D  

Explanation:

5,778K

Answer:red

Explanation:

The stars can be classified in many ways, including by mass, color, and temperature. The color and the temperature of a star are usually related.

Antares is a red supergiant.

Answer and Explanation:

Let's just make it easy and have both parents be heterozygous. This means that they each have 1 dominant allele (R) and 1 recessive allele (r). Make a Punnett Square (see attachment).

The possible outcomes are RR (one of it), Rr (two of it), and rr (one of it). That means that phenotypically, 3 of the offspring will be round and 1 will be wrinkled.

Answer:

Rr,    RR,    rr

Explanation:

Answer:

8M IM NOT SURE SO. IF YOU CAN GET A CLEARED PICTURE OF IT WOULD REALLY HELP

The sweetest tea would be the one that contains the highest amount of sugar. The sweetness of a drink is determined by sugar content. Hence, a sweet tea with larger sugar amount will taste sweeter.

The sweetness of tea is determined by the amount of sugar that it contains. So among different sweet teas, the one with the highest amount of sugar will taste the sweetest. For instance, if Tea A contains 20grams of sugar per serving and Tea B contains 30grams of sugar per serving, then Tea B would taste sweeter than Tea A, because it contains more sugar.

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Answer&Explanation:

According to dilution law concentration before dilution is equal to concentration after dilution hence;;

Volume×molarity(before)=volume×molarty(after)

345ml×1.5M=?M×250ml

Cross multiplication

Molarity will be equal to 2.07M