How much heat energy is produced by 0.5 Wh of electrical energy

Answers

Answer 1

Answer: 1 W is equivalent to 1 J/s

So,
0.5 Wh = 0.5 (J/s) (h)

Converting h to s,
0.5 (J/s) (h) (60min/1h) (60s/1min) = 1800J

Thefore,
0.5Wh is 1800J or 1.8kJ of heat energy

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Gasoline is a mixture composed primarily of hydrocarbons such as isooctane, which is also known as 2,2,4-trimethylpentane.Gasoline is assigned a number called an octane rating. Gasoline with an octane rating of 87 performs the same as a mixture that consists of 87% isooctane and 13% heptane.
An alternative fuel, E-85, can be used in some automobiles. This fuel is a mixture of 85% ethanol and 15% gasoline.

State the octane rating of a gasoline sample that performs the same as a mixture consisting of 92% isooctane and 8% heptane.
Identify the functional group in a molecule of ethanol in the alternative fuel E-85.

Answers

Because of the 92% isooctane, the gasoline sample's octane rating is 92.The functional group in ethanol is the hydroxyl group.

Which element has the following Electron configuration? *1s22s22p63s2
O Boron
O Phosphorus
O Manganese
O Magnesium

Answers

Magnesium. You can count the electrons in each level and because the number of electrons is the same with protons you have the atomic number based of which you can get the element in the periodic table

You've just solved a problem and the answer is the mass of an electron, me=9.11×10−31kilograms. How would you enter this number into the answer box?

Answers

The mass of an electron can be expressed in the box as $\boxed{{m_e} = 9.1 * {{10}^( - 31)}{\text{ kg}}}$ .

Further explanation:

Atom is the smallest particle that can be present in any element. It is also known as the building unit of matter. Each atom has a central part that is known as the atomic nucleus. There are three subatomic particles that constitute the atom. These particles are protons, neutrons, and electrons. The atomic nucleus consists of protons and neutrons, both are collectively called nucleons. Electrons revolve around the nucleus of an atom in definite orbits.

Protons are positively charged subatomic particles, electrons are negatively charged and neutrons have no charge. Since electrons carry a unit negative charge, these create an electric field around them. These also participate in nuclear reactions. The mass of an electron $\left( {{m_e}} \right)$ is $9.1 * {10^( - 31)}{\text{ kg}}$ , that of protons is $1.6726219 * {10^( - 27)}{\text{ kg}}$ and that of neutrons is $1.674927471 * {10^( - 27)}{\text{ kg}}$ . The electrons are responsible for chemical properties of elements. The distribution and arrangement of electrons is used to predict whether the element will be inert or reactive.

Therefore the required answer is $\boxed{{m_e} = 9.1 * {{10}^( - 31)}{\text{ kg}}}$ .

Learn more:

Component of John Dalton’s atomic theory: brainly.com/question/2357175
Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: atom, matter, atomic nucleus, proton, electron, neutron, subatomic particle, nuclear reactions, electric field, reactive, inert.

Which describes the role of sunlight in chemical reactions?

Answers

photosynthesis generally a photochemical reaction.

Which is NOT an indicator of a chemical change? Heat or light is produced. State of matter changes. A new substance is formed. A gas is formed.

Answers

The choice that is not an indicator of a chemical change is "State of matter changes". More common than not, chemical reactions produce energy in the form of light or heat. Along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid). Technically, a change in state is a physical change unless it also involves one of the other choices.

Answer:

State of matter changes.

Explanation:

Which of the following is a farming method that helps reduce the effects of wind erosion?

Answers

Introduction | Effects of wind erosion | Factors influencing wind erosion ... The Dust Bowl crisis prompted prairie agriculture to seek ways to control and prevent wind erosion. ... herbicides and other crop inputs have helped farmers reduce wind erosion. .... Special measures are needed to prevent wind erosion on these fields.

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