The graph shows the changes in the phase of ice when it is heated which of the following temperatures describes the value of A

Answer:

The energy required is 158 J

Explanation:

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

When the heat added or removed from a substance causes a change in temperature in it without affecting its molecular structure, this heat is called sensible heat.

In other words, when a system absorbs (or gives up) a certain amount of heat, it can happen that it experiences a change in its temperature, which implies sensible heat.

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:

Replacing:

Q= 0.79 [tex]\frac{J}{g*C}[/tex] *10 g* 20 C

Solving:

Q= 158 J

The energy required is 158 J

Answer:

going without without masks is like to play with a dirty things which is very undesired and unwanted .corona virus is very serious world wide epidemic which is surrounded in all region due to our carelessness many lives are taken due to our carelessness. so please wear mask and maintain social distance to fight against all types of communicable diseases. I hope please be rational and aware.

Answer:

Hola porfa ayudame si podes

Answer:

A

Explanation:

Answer:

The answer is honey.

Explanation:

Answer: alcohol

Explanation:

Answer:

when it reduces heat.

Explanation:

Thermal energy is transferred to material,the motion of its particles speeds up and it's temperature differences.Insulating materials are bad conductors and so this reduces the heat loss by conduction.The material also prevents air circulating inside the cavity,therefore reducing heat loss by convection.Heat loss through the roof can be reduced by laying loft insulation.

Answer: the water avaperatid

because of the heat lamp

hope this helps

Explanation:

Answer:

like ground rocks and shells I think.

Explanation:

Answer:

what????????????????????

Answer:

1. ?

Explanation:

I'm not really sure, but knowing that gas particles are constantly moving makes me think that an ideal gas sample would have constantly moving particles. also with 2., gas has a lot of energy and their particles rarely come into contact with each other (they're even thought of as more independent than as one substance); with 3., there isn't much of a force between gas particles, which is why they're able to stay in that state of matter; and with 4., well, volume is important lol.

But the kinetic molecular theory states that games are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion, so I'm sticking with the answer being number 1.

Answer:

[tex]0.75\ \text{M}[/tex]

Explanation:

[tex]C_1[/tex] = Concentration of [tex]Na_2CO_3[/tex]

[tex]C_2[/tex] = Concentration of [tex]HCl[/tex] = 1 M

[tex]V_1[/tex] = Volume of [tex]Na_2CO_3[/tex] = 20 mL

[tex]V_2[/tex] = Volume of [tex]HCl[/tex] = 15 mL

We have the relation

[tex]V_1C_1=V_2C_2\\\Rightarrow C_1=\dfrac{V_2C_2}{V_1}\\\Rightarrow C_1=\dfrac{15\times 1}{20}\\\Rightarrow C_1=0.75\ \text{M}[/tex]

The concentration of [tex]Na_2CO_3[/tex] is [tex]0.75\ \text{M}[/tex].

Answer: omnivores

Explanation:

I just know

Answer:

A: Add a substance to the wash that reduces the number of charges transferred.

Explanation:

The attraction between opposite charges make the clothes attract together. To reduce them Increase the temperature of the air in the dryer to weaken the electric forces. Hence, option A is correct.

An electric dryer is used to dry the clothes and hair or other substances using electric current. A substance can have both negative and positive charges. The opposite charges will attract together while the negative charges repel.

By exposing clothes to electric dryer it will gain electrons from the dryer and the positive poles of the clothes will attracts it. The electric current from the dryer will make clothes temporarily polarised.

If temperature increases, the intermolecular force of attraction decreases by making the kinetic energy of molecules raised. Therefore by increasing the temperature of air from the dryer the attraction can be reduced.

To find more on electric charges, refer here:

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Answer:

Chex mix is not an example of a element or compound.

Chex mix is an example of a mixture

l hope it helps

Answer:moles = 2.9 g Ni × 1 mol Ni 58.69 g Ni = 0.0663 mol Ni

Answer:

The new temperature will be 204.4 K

Explanation:

As the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Charles's Law consists of the relationship between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .

In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Finally, Gay-Lussac's law can be expressed mathematically as follows:

[tex]\frac{P}{T} =k[/tex]

This law indicates that the quotient between pressure and temperature is constant.

This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the molecules of the gas move faster. Then the number of collisions against the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

[tex]\frac{P*V}{T} =k[/tex]

You want to study two different states, an initial state and a final state. It will happen:

[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{100 kPa*150 mL}{292 K} =\frac{105 kPa*100 mL}{T2}[/tex]

Solving:

[tex]T2=105 kPa*100 mL*\frac{292 K}{100 kPa*150 mL}[/tex]

T2= 204.4 K

The new temperature will be 204.4 K

Answer:

Matter is made up of particles whose properties determine the observable characteristics of matter and its reactivity.

Explanation:

Answer:

6.02E23Na

Explanation:

you just convert the element to a decimal form

Answer:

i think

D. Landmasses disrupt the spin of a typhoon while bodies of water

strengthen typhoon.

Answer:

Here is the options: lithium, silver, or alkaline

Explanation:If any of these are on your quiz you will get it. I have been doing my research and studying so this is quite accurate.

Explanation:

Prior preparation is required in a location at risk of natural disasters, this includes a communication system and infrastructure aimed at protecting and educating society. Technology is extremely important for the prevention of natural disasters, through forecasting and monitoring systems it is possible to map and analyze the possible risks and anticipate them with the necessary solutions, such as removing a population from a certain location with a risk of drilling.

It is necessary for the population to be aware, understand the alerts and signals issued in case of risk and follow the guidelines of the trained authorities, in this way it is possible to mitigate the effects of natural disasters.

Answer:

D.) electron spin

Each sublevel is labeled by its principal energy level and sublevel. Electrons are indicated by arrows inside of the circles. An arrow pointing upwards indicates one spin direction, while a downward pointing arrow indicates the other direction

Answer:

120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed? If you have a 300

Explanation:

Hope this helps!

the element sodium has 1,000,000 million energy levels. in an electrically neutral sodium atom- there are 3 energy levels.

Answer:

Sodium has 11 electrons. The first two fill the innermost energy level. The second energy level is also full, holding eight electrons and one electron remaining in the outer energy level. It is the number of outer electrons that give an element its chemical properties.

Explanation:

Answer:

um

Explanation:

help you? you mean do it for you? nah man you can just use the calculator ;)

Answer:

0.02L

Explanation:

Using the formula V1/T1 = V2/T2

Given

V1 = 0.5L

T1 = 25 degrees

T2 = 1 degree

V2 =?

Substitute

0.5/25 = V2/1

Cross multiply

25V2 = 0.5

V2 = 0.5/25

V2 = 0.02L

Hence the new volume will be 0.02L

Oxidation half equation; 2Fe^2+ ----> 2Fe^3+ + 6e

Reduction half equation; 3Cu^2+  + 6e ---->3Cu

An oxidation-reduction (redox) reaction is a type of chemical reaction that involves the transfer of electrons between two species. Oxidation refers to the loss of electrons by a substance, while reduction refers to the gain of electrons by a substance.

Redox reactions are important in many chemical and biological processes, such as cellular respiration, photosynthesis, corrosion, and combustion. They can also be used in industrial processes, such as electroplating, battery operation, and chemical synthesis.

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