Briefly explain why adding insulation to an attic helps reduce heating costs.

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Answer 1

Answer:

Answer:

Insulation reduces the exchange of heat through a surface such as a wall, attic, duct or roof. In a well-insulated home, less warm air escapes from the house during the winter, and less cool air escapes during the summer, reducing the amount of energy needed for heating and cooling

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Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?1) If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.2) If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.3) If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.4) If the substance is a liquid or solid, the production of an odor would indicate a chemical change.
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Chlorine has two naturally occuring isotopes - chlorine-35 and chlorine-37. Elaborate on how the atomic mass is determined given that chlorine-35 has an abundance of 75.78% and has a mass of 34.969 amu and that chlorine-37 has an abundance of 24.22% and a mass of 36.966 amu.

when you check a toaster with a digital or analog video in which one of the following indicates dirty contacts on the thermostat blade

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i sow it the answer if you serarch it in the box i see it the same question!

Answer:

Explanation:current higher

Than the rated current

Is NO a polar molecule?

Answers

Electronegativity values are useful in determining if a bond is to be classified as nonpolar covalent, polar covalent or ionic. The electronegativities of oxygen and nitrogen are respectively, 3.44 and 3.04 on Pauling scale, the electronegativity difference being, 0.4. The bond is considered to be non-polar covalent.
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Please answer. Brainliest!

Answers

Answer:

The equation is balanced.

Explanation:

The number of P atoms in the reactant side is 4 and the number of P atoms in the product side is also 4.

The number of O atoms in the reactant side is 16 and the number of O atoms in the product side is also 16.

The number of H atoms in the reactant side is 12 and the number of H atoms in the product side is also 12.

These results are in accordance with the law of conservation of mass.

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In which substance do the molecules have the strongest attractions to one another ?

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The molecules have the strongest attraction to one another in a substance called sugar.

The nuclear symbol for uranium-235 should be written asO U-235.
225
92 U
233
143U
OU

Answers

Answer:

²³⁵₉₂U

Explanation:

The right symbol for the nuclei is ²³⁵₉₂U;

For this chemical element, the atom is represented by the symbol U;

To the superscript before the symbol is the mass number

The subscript before the symbol is the atomic number

Mass number is the number of protons and neutrons

Atomic number is the number of protons.

______________ is a durable metal and is widely used for casting, which is a process by which melted metal is poured into a mold.a. Bronze
c. Copper
b. Silver
d. Gold Please select the best answer from the choices provided A B C D

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The best answer is (c.) Copper. Copper is the durable metal that is widely used for casting, which is a process by which melted metal is poured into a mold. Copper is one of the common metal that is used and other material may include tin, zinc, aluminum and magnesium.

Answer:

Explanation:

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True or false. Nitrogen is extremely important for good crops?