which of these describes the electrostatic force
a. particles of the same charge repel each other
b. particles of different masses repel each other
c. particles of opposite charge repel each other
d. particles without charge repel each other

Answer:

18.8

Explanation:

Just trust me it’s Ap3x Things

Answer:

18.8

Explanation:

*wink wink*

Answer: A. Physical features

Explanation:

A dichotomous key for identifying organisms primarily uses the physical features of the organisms. The user is required to accurately observe and describe these characteristics to correctly proceed in using the key.

When using a dichotomous key to identify organisms, we primarily look at the physical features of the organisms. A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. The key presents a series of choices about the characteristics of the unknown organisms; these choices are based on the physical features. The user must accurately observe and describe the physical features in order to correctly proceed in using the key.

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Answer:

Blue

Explanation:

It is the closest color to violet.

The color which has the highest energy is the blue color because it have low wavelength value.

Energy of any waves of color will be calculated by using the below equation as:

E = hυ, where ............... (i)

h = plank's constant

υ = frequency of wave

Frequency is inversely proportional to wavelength (λ) as:
υ = c/λ, where ................. (ii)

c = speed of light

From (i) & (ii)

E = hc/λ

From this we conclude that wavelength is inversely proportional to energy and wavelength of blue color is smaller than other so that it will have higher energy.

Hence blue color has the highest energy.

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Answer:

[tex]m_{Al} = 18.019\,g[/tex]

Explanation:

There is a heating process between an aluminium piece and water, which is described by the First Law of Thermodynamics:

[tex]Q_{Al} = - Q_{w}[/tex]

[tex]m_{Al}\cdot c_{Al}\cdot (T_{o,Al}-T) = m_{w}\cdot c_{w}\cdot (T-T_{o,w})[/tex]

The mass of the aluminium piece is therefore cleared and known variables are substituted:

[tex]m_{Al} = \frac{m_{w}\cdot c_{w}\cdot (T-T_{o,w})}{c_{Al}\cdot (T_{o,Al}-T)}[/tex]

[tex]m_{Al} = \frac{(100\,g)\cdot \left(4.184\,\frac{J}{g\cdot^{\circ}C} \right)\cdot (15^{\circ}C-10^{\circ}C)}{\left(0.900\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (144^{\circ}C-15^{\circ}C)}[/tex]

[tex]m_{Al} = 18.019\,g[/tex]

Answer:

poor hydrogen-ion donor

Explanation:

Acid dissociation constant constant chemistry is the equilibrium constant of the dissociation reaction of an acid, it is denoted by Ka. This equilibrium constant is a measure of the strength of an acid in a solution.

Note these as a rule of thumb:

When Ka is large, the dissociation of the acid is favored.

When Ka is small, the acid does not dissociate to a large extent.

Hence, a Ka of 4.3 x 10-7 shows a weak acid. A weak acid is a poor hydrogen ion donor because it does not dissociate to a large extent in solution.

According to its chemical reaction where it donates a hydrogen ion, and despite having a small Ka value, H2CO3 (carbonic acid) can be classified as a relatively good hydrogen-ion donor.

Given that the equation  H2CO3 = H+ + HCO3- represents the dissociation of carbonic acid into a hydrogen ion (H+) and a bicarbonate ion (HCO3-), H2CO3 can be identified as a good hydrogen-ion donor. This is because in this reaction, it readily gives up a hydrogen ion, which is characteristic of acid behavior. An acid's strength is determined by its ability to donate hydrogen ions, and the bigger the constant Ka value, the stronger the acid. However, a Ka of 4.3 x 10-7 is quite small, indicating that carbonic acid does not completely ionize in solution but it's relatively better at donating hydrogen ions than accepting them.

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Answer:

Solute, solvent

Explanation:

In a solution, the substance that is dissolved is called the solute, and the substance that does the dissolving is called the solvent. Together, they form a solution, which is a homogeneous mixture where the solute is evenly distributed in the solvent.

In a solution, the substance that gets dissolved is called the solute. For instance, when you make a cup of tea, the tea leaves (or tea bag) represent the solute, as they get dissolved in the water. Meanwhile, the substance that does the dissolving is referred to as the solvent. In the tea example, the water would be the solvent because it is the substance that dissolves the tea leaves or tea bag.

The process of a solvent dissolving a solute results in a solution, a homogeneous mixture where the solute is uniformly distributed within the solvent.

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To determine the concentration of a solution, you need to first measure the volume of the solution, then calculate the moles of solute present. After these measurements, divide the number of moles of solute by the volume of the solution in liters to get the molarity. For dilutions, use the formula M1V1 = M2V2.

To determine the concentration of the solution in the eyedropper, we would use the concept of molarity and possibly dilution. As presented in the instructional guidelines:

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In Eyedropper the 1:10 solution is more concentrated than the 1:20 solution.

The concentration of the unknown solution in the eyedropper, follow these steps:

C2 = (C1 * V1) / V2 = (1.3 x [tex]10^-^4[/tex] M * 2.0 mL) / 10.0 mL = 2.6 x[tex]10^-^5[/tex] M

Ensure you rinse the beaker, funnel, and inside of the volumetric flask with water to avoid contamination. Finally, when adding the last few drops of water to the solution, make sure your eyes are level with the graduation mark to ensure accurate volume measurement.

Questions and Discussion

Final answer:

A pan of warm water will become the same temperature as the room because of heat transfer due to non-equilibrium. Heat will move from the warm pan to the cooler room air until they reach thermal equilibrium. This process is guided by the second law of thermodynamics and the principle of calorimetry.

Explanation:

A pan of warm water will eventually become the same temperature as the room it is in because the water and the pan will exchange heat with the room's air until thermal equilibrium is reached. Initially, the pan is at a higher temperature than the surrounding air. Over time, heat is transferred from the warmer object (the pan with water) to the cooler one (the surrounding air) until both reach the same temperature. This principle is based on the second law of thermodynamics, stating that the heat will always flow from a hotter object to a cooler one until the system reaches equilibrium.

When you pour 0.250 kg of 20.0°C water into a 0.500-kg aluminum pan with a temperature of 150°C and place it on an insulated pad, the pan and the water are initially not in thermal equilibrium. However, due to the rapid heat transfer, they will quickly exchange heat. The heat lost by the pan equals the heat gained by the water. The process continues until they are both at the same temperature, known as the thermal equilibrium.

Answer:

C. It makes sure there is a balance inside the body

Explanation:

Hope this helps

Answer:

C. It make sure there is a balance inside the body.

Explanation:

Homeostasis in the body tries to maintain the norm for the survival of the body. This includes temperature & amount of fluids inside the body. If they are too out in the end of the spectrum, your brain will tell you that you need to obtain it, such as drinking more water, going to a cool place if you are in the heat, or to obtain warmth if you are in the cold.

Answer:Chemical energy

Explanation:

Answer:

both

convex lens

concave lens

both

Explanation:

Answer:

A concave lens is

✔ thinner

in the middle than at the edges, and causes light rays to

✔ diverge

.

A convex lens is

✔ thicker

in the middle than at the edges, and causes light rays to

✔ converge

.

Explanation:

Answer:

insulators

Explanation:

Insulators are any substance which do not let any heat to pass through it. In other words we can say that insulators are bad conductors of heat.

Example of insulators are clothes, woods, plastic

Blacksmiths work with metals which are heated at very high temperature. If the body of blacksmiths comes in contacts of metal with high temperature, they may get severe burn. To avoid any accidents they use clothes and gloves so in case if by mistake they come in contact with high temperature, these clothes and gear do not let let pass through it and protect the body of blacksmith.  

Since these clothes and gloves do not let heat flow through it they belong to the category of insulators.

Answer:

explanation:

1

Answer:

C is the answer

Explanation:

Heat energy is transformed into electrical energy.

Answer:

B. Electrical energy is transformed into light energy.

Answer:

Covalent bond

Explanation:

Answer:yes

Explanation:Because yes

Answer:

C.

Explanation:

To find the mass of 4.50 moles of Ba(NO2)2, you calculate its molar mass using atomic masses and multiply by the number of moles. The result is 1176.03 grams for 4.50 moles of Ba(NO2)2.

To calculate the mass of 4.50 moles of Ba(NO2)2, you first need to find its molar mass by adding the atomic masses of barium (Ba), nitrogen (N), and oxygen (O) from the periodic table. The molar mass of Ba(NO2)2 is calculated as follows:

(1 mol Ba)(137.33 g/mol) + (2 mol N)(14.01 g/mol) + (4 mol O)(16.00 g/mol) = 261.34 g/mol

Then, you multiply the molar mass by the number of moles:

(4.50 moles) × (261.34 g/mol) = 1176.03 grams

Therefore, there are 1176.03 grams in 4.50 moles of Ba(NO2)2.

Answer: The answer is C

Explanation:

A bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that do not occur in water.

The third option is correct.

The following information should be considered:

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Answer:

D

Explanation:

It depend on your parents genes. What they have, is what you'll have.

~Jack Pullman

p.s. Mark for brainiest!

Answer:

C. Nutrition and Enviroment

Explanation:

An individual growing up in poverty will not get as the good nutrition as an individual from a rich household. Nutrition affects growth, so malnutrition can make a person shorter and ruining their potentially taller height.

Answer:The answer is B

Explanation:

There is less water lost due to evaporation and therefore more available to plants. Mulch and minimum tillage results in twice as much available water as does deep tillage. This is an immediate benefit. We are looking for future benefits: less runoff and erosion, more soil stays in place, the soil is more fertile, and farmers use less fossil fuels.

Answer:

I’m pretty sure its D. Sweating when you are hot

Answer:C

Explanation:

on edge

Answer:

c) ensure the results are accurate

Explanation:

you don't really know they're accurate unless you get them 2+ times

Answer:

124.579 g

Explanation:

Amount of heat required to change the temperature of body is given by the equation given below

Q = m* c * ΔT ____________________equation A

where Q is the total heat energy required by the any object

c is the specific heat capacity of the body J/gK

ΔT is the difference of final temperature of the object and initial temperature of the object

______________________________________

Given Q = 6290 joules

c = 0.900 J/gK

To calculate the temperature in kelvin from Celsius

we can use the formula

K = C + 273

initial temperature  = 23.9°C

initial temperature on kelvin scale =  23.9° + 273 = 296.9

Final temperature  = 80°C

initial temperature on kelvin scale =  80° + 273 = 353

ΔT(temperature difference) = 353 - 296.9 = 56.1

___________________________________________

let the mass of of the  aluminum be m g

substituting the value of Q , c, ΔT in equation A we have

Q = m* c * ΔT

=> 6290 = m * 0.900 * 56.1

=> m = 6290/(0.900 * 56.1 )

=> m = 6290/50.49

=> m = 124.579 g

The mass of the  aluminum is 124.579 g

Taking into account the definition of calorimetry, the mass of the aluminum is 124.58 grams.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the heat energy that is supplied to a body or an object, causes its temperature to increase without affecting its molecular structure and therefore its phase. In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

The equation that allows calculating heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

6290 J= 0.9[tex]\frac{J}{gK}[/tex]× m× 56.1 K

Solving:

6290 J= 50.49 [tex]\frac{J}{g}[/tex]× m

6290 J÷ 50.49 [tex]\frac{J}{g}[/tex]= m

124.58 g= m

Finally, the mass of the aluminum is 124.58 grams.

Learn more:

Answer:

D.

Explanation:

Suspension : for example sand and water. You can separate it when it sits still.

The type of mixture is likely to separate if it is allowed to sit still is suspension. Therefore, option D is correct.

A heterogeneous mixture of a finely dispersed substance in a liquid is referred to as a suspension. Similar to how salt and water dissolve in one another, the solid is not dissolved in the liquid.

Examples of mixtures that are most frequently used are chalk and water, dirty water, flour and water, dust and air, fog, magnesium milk, etc.

Suspension parts can be divided into three categories: linkages, springs, and shock absorbers. The bars and brackets that support the wheels, springs, and shock absorbers are known as links. The car is padded by springs, which reduce shock loads caused by potholes and bumps in the road.

A fluid mixture that contains solid particles large enough for sedimentation is called a suspension.

Thus, option D is correct.

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Answer:

C) It has a constant average kinetic energy

Explanation:

The average kinetic energy of the particles in a gas is directly proportional to the temperature of the gas, according to the equation.

k is the Boltzmann's constant

T is the absolute temperature of the gas

Therefore, temperature of a gas is a measure of the average kinetic energy of the particles.

In this problem, we are told that the gas is at constant temperature (and volume): therefore, according to the previous equation, this means that the average kinetic energy is also constant.

Answer:

C - It has a constant average kinetic energy

Explanation:

Got it right on the test

Answer:

0.0521 M

Explanation:

          HClO2 + NaOH ---> NaClO2 + H2O

M(HClO2)V(HClO2) = M(NaOH)V(NaOH)

M(HClO2)*41.6 mL = 0.146 M*14.85 mL

M(HClO2) = 0.146*14.85/41.6 M = 0.0521 M

Answer:

Density directly proportional to mass and inversely proportional to volume, if you increase the density of the mass increases and vice versa, if you increase the volume density decreases and vice versa.

A compound is something that is composed of two or more separate elements; a mixture.

Explanation:

The net ionic equation is:

[tex]\[ \text{OH}^- + \text{H}^+ \rightarrow \text{H}_2\text{O} \][/tex]

To determine the net ionic equation, we first need to write the balanced chemical equation and then identify the spectator ions.

The given chemical equation is:

[tex]\[ \text{Mg(OH)}_2 + 2 \text{HNO}_3 \rightarrow \text{Mg(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \][/tex]

To balance the equation:

[tex]\[ \text{Mg(OH)}_2 + 2 \text{HNO}_3 \rightarrow \text{Mg(NO}_3\text{)}_2 + 2 \text{H}_2\text{O} \][/tex]

In the balanced equation, all species are dissolved in water, so we can split them into ions to identify spectator ions.

1. Mg(OH)₂ dissociates into [tex]\( \text{Mg}^{2+} \) and \( 2\text{OH}^- \)[/tex]

2. HNO₃ dissociates into [tex]\( \text{H}^+ \) and \( \text{NO}_3^- \)[/tex]

3. Mg(NO₃)₂ dissociates into [tex]\( \text{Mg}^{2+} \) and \( 2\text{NO}_3^- \)[/tex]

4. H₂O does not dissociate significantly.

So, the net ionic equation is:

[tex]\[ \text{Mg}^{2+} + 2\text{OH}^- + 2\text{H}^+ + 2\text{NO}_3^- \rightarrow \text{Mg}^{2+} + 2\text{NO}_3^- + 2\text{H}_2\text{O} \][/tex]

Cancelling out the spectator ions ([tex]\( \text{Mg}^{2+} \) and \( \text{NO}_3^- \)[/tex]), we get:

[tex]\[ 2\text{OH}^- + 2\text{H}^+ \rightarrow 2\text{H}_2\text{O} \][/tex]

Therefore, the net ionic equation is:

[tex]\[ \text{OH}^- + \text{H}^+ \rightarrow \text{H}_2\text{O} \][/tex]

Answer:

Acid

Explanation:

Vinegar is a dilute form of acetic acid, while HCl is hydrochloric acid and H2SO4 is sulfuric acid. All of these are acids. Hope this helps!

Answer:

acids

Explanation: