Hand warmers and instant cold packs use _____ that release or absorb thermal energy.

Answers

Answer 1

Answer:

Hand warmers and instant cold packs use Endothermic that release or absorb thermal energy.

Answer 2

Hand warmers and instant cold packs use endothermic reaction that release or absorb thermal energy.

What is thermal energy?

Thermal energy is defined as by virtue of its temperature, a system in a condition of thermodynamic equilibrium contains internal energy. Fossil fuels like natural gas, coal, and oil are examples of thermal energy sources. They also include solar heat, electric heat pumps, and geothermal heat. Thermal energy is a type of kinetic energy, which is energy brought on by motion, and is brought on by the motion of particles. Things have an interior temperature as a result of thermal energy, which can be detected with a thermometer.

Endothermic reaction is defined as the chemical processes that result in the formation of products when the reactants absorb heat energy from their surroundings. A chemical reaction or physical change is referred to as being endothermic when heat is absorbed by the system from the environment. An endothermic process causes the system to absorb heat from its surroundings, which causes the surroundings' temperature to drop.

Thus, hand warmers and instant cold packs use endothermic reaction that release or absorb thermal energy.

To learn more about thermal energy, refer to the link below:

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Related Questions

a brief description of atoms and how they relate to
molecules and compounds

Answers

Answer:

Explanation:

Atoms are the thing that make up molecules and compounds. Molecules contain two or more atoms and are held together by covalent bonds

When an organism dies it is exposed to many different types of biotic and abiotic factors biotic factors include?

Answers

Answer:

the organisms themselves,other organisms,interactions between living organisms, and even their waste.

Whymilk is taken as mixture​

Answers

Explanation:

Main compounds of milk are lactose and casein. And it is also called a colloidal mixture (i.e. in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance). Therefore milk is regarded as a mixture not as a pure substance. So this is the required answer.

What is the mass of 1,300 cm of gasoline? The density of gasoline is 0.67 g/cm.

Answers

Answer:

Volume x Density = Mass of a substance

1300 x 0.67 = 871

The mass is 871 (unit)

There is 200 grams of water on a stove. The water is currently 25 C. How much energy in joules must be used to raise the water to 90 C?

Answers

Answer:

q

=

64 kJ this is answer. .

can anyone tell me "what are the exceptions of law of reciprocal proportions??"​

Answers

The law states that if two different elements combine separately with a fixed mass of a third element, the ratio of the masses in which they combine are either the same or are in simple multiple ratio of the masses in which they combine with each other .

What causes streams to form?
O absorption
O precipitation
O glaciers
O lakes

Answers

Answer: essay the answer is B: precipitation

Explanation:


c) ¿Qué ocurriría si tenemos disueltos 200 g de
nitrato de potasio en 300 g de agua a 60°C
y enfriamos la disolución hasta los 10 °C?

Answers

ayyyy amiga la mera neta no se perdón hahaha sorrey

Do all particles pass right through the atoms undeflected?​

Answers

AnswereYs

Explanatioynt:Yes

When refering to a gas, the higher the temperature, the faster the particles move:
True
False

Answers

Answer:

True

Explanation:

In Gas,The movement of particles depends upon their temperature. When, the temperature is high the movement of the particles is faster.When, the temperature is low the movement of the particles is slower down and move close together.

Hence,

The above statement is true for, the gas particles moves faster in high temperature.

Carbon tetrachlordie (CCI4) is ___

A. iconic

B. Covalent

Answers

Answer:

b

Explanation:

What gas in our atmosphere is thought to have come from plants and algae alone?

Answers

Answer:

Oxegen

Explanation:

All that oxygen has to come from somewhere. You might already know that it comes from photosynthetic organisms like plants.

How many grams of hydrogen are needed to fully react 621. 9 grams of nitrogen gas.

Answers

Answer:

9 grams of nitrogen gas

Explanation:

One of the few resources on Mars is

Answers

Answer:

iron .. titanium.. nickel....aluminum... sulfur... and calcium

Describe the nucleus of the
atom.

Answers

Answer:

The nucleus of atom is composed of two subatomic particles that each have charges.

Protons, which are positively charged particles.Neutrons, which are neutrally charged particles.

Both reside in the nucleus of an atom. The amount of protons and neutrons (Electrons can to) is what helps us identify each atom apart. Electrons are NOT in the nucleus of atom but orbit it in outer layers called orbitals.

What is activation energy

Answers

Answer: Activation energy is defined as the minimum amount of extra energy required by a reacting molecule to get converted into product. It can also be described as the minimum amount of energy needed to activate or energize molecules or atoms so that they can undergo a chemical reaction or transformation.

Explanation:

đơn chất nào sau đây tác dụng với dung dịch axit sunfuric loãng sinh ra khí ?
a đồng
b cacbon
c nhôm
d lưu huỳnh

Answers

Answer:

C. Al

Explanation:

2Al+ 3H2SO4(l)------> Al2(SO4)3+ 3H2


9) What is the final pressure in the container shown below after the valve is opened and the gases are allowed
to flow? (The gases do not act)
0
4.00 am
3.00


NE
2.00 am
2.00 L

Answers

A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.

We have 2 containers connected by a valve.

One container has a volume of 3.00 L and contains O₂ at 4.00 atm. The other container has a volume of 2.00 L and contains Ne at 2.00 atm.

When the valve is opened, the total volume is the sum of the 2 containers.

[tex]V_2 = 3.00 L + 2.00 L = 5.00 L[/tex]

Assuming constant temperature and ideal behavior, we can calculate the final pressure of each gas using Boyle's law.

O₂

[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{4.00atm \times 3.00L}{5.00L} = 2.40atm[/tex]

Ne

[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{2.00atm \times 2.00L}{5.00L} = 0.800atm[/tex]

The final pressure in the container will be the sum of the final pressures of the gases.

[tex]P = 2.40 atm + 0.800 atm = 3.20 atm[/tex]

A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.

Learn more: https://brainly.com/question/1437490

Hund's rule: states that electrons always enter an empty orbital before they pair up.

Answers

Answer:

true

Explanation:

write True If the statement Is Correct And False If Not​

Answers

Answer:

11.false12.true13.true14.false15.true16.false17.false18.false19.true20.false

21.PC22.CC23.PC24.CC25.CC

Explanation:

I think it is helps you

Which are effects of long-term exposure to mustard gas? Select all that apply. One, some, or all responses may be correct.

Answers

The effects of long-term exposure to mustard gas causes mortality and chronic respiratory disease.

Exposure to mustard gas in the long term can result in mortality from influenza, pneumonia as well as chronic breathing disease. Exposure for long term leads to respiratory complications and septic shock. Extensive breathing in the environment of mustard gas can cause chronic respiratory disease, respiratory infections or death.

Extensive eye exposure to this gas can cause permanent blindness. Exposure to mustard gas may also increase the chances of lung and respiratory cancer so we can conclude that mustard gas is lethal and can cause a number of diseases in a person who is exposed to it.

Learn more: https://brainly.com/question/25686553

wht will react with acid to giv bluish green salt nd water ??

Answers

Explanation:

When dilute HCl is added to a small amount of copper oxide in a beaker, a greenish-yellow gas is released and a bluish-green solution is formed. Since the metal oxides such as a Copper oxide (CuO) are basic in nature, it reacts with acids such as HCl to form the corresponding salt and water.

I need help with this question please

Answers

1-propanol is the correct answer.

carbon reduction process is not applied for extraction of alkali metal . why ?​

Answers

Answer:

The alkali metals are the highly electropositive metals. Highly electropositive metals cannot be extraction carbon reduction process, because these metals do not react with carbon

Explanation:

An unknown element X forms a compound with chlorine: XCL2. Predict the chemical formula of the compound that element X makes with oxygen. Justify your answer.​

Answers

hold on i’m gonna go check really quick

why does magnesium in an aqueous solution of magnesium chloride conduct electricity but solid magnesium chloride does not?

Answers

Answer:

Delocalized electrons

Explanation:

Magnesium Chloride is an ionic compound, so its lattice structure prevents the flow of electrons. However, when you convert the ionic compound into an aqueous solution it allows movement of electrons/ions due to the breakdown of the molecular forces which make it conductible. In short, Ionic compounds as a solid are not conductible but they are in an aqueous form.

Some copper is palced in a previouly weighted crucible and reweighed .
Mass of crucible + copper = 5.92g
Mass of crucible = 4.65g
Clculate the mass of copper used in the experiment

Answers

Answer:  1.27g (mass of Copper)

Explanation:

We can find the mass of copper by finding the difference between the mass of the crucible and the copper, and just the crucible. This is possible since the mass that is left would be attributed to just the copper.

Mass of copper = (Mass of crucible + copper) - Mass of crucible

                          = 5.92 g - 4.65 g

                          = 1.27 g

The electron configuration for Helium (He) is shown below.

1s2

Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?

Answers

Answer:

3rd image

Explanation:

How do ionic bonds form?
Quick

Answers

Answer:

Explanation: ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

superscript Coefficient

Me think

Please help I will give brainliest ;3

Answers

Answer:

oxygen, carbondioxide

carbondioxide, oxygen

Oxygen, carbon monoxide,Oxygen, carbon monoxide
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