Digestion breaks down _____into simpler substances that your body can use for raw materials and energy

Answers

Answer 1

Answer: The perfect word to fill the blank is carbohydrates. Digestion breaks down carbohydrates into simpler substances that your body can use for raw materials and energy. Carbohydrates are from the food we eat and are used in the body to produce and supply energy.

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A student made a copper bracelet by hammering a small copper bar into the desired shape. The bracelet has a mass of 30.1 grams and was at a temperature of 21°C in the classroom. After the student wore the bracelet, the bracelet reached a temperature of 33°C. Later, the student removed the bracelet and placed it on a desk at home, where it cooled from 33°C to 19°C. The specific heat capacity of copper is 0.385 J/g•K.69 Explain, in terms of heat flow, the change in the temperature of the bracelet when the student wore the bracelet. [1]

70 Determine the number of moles of copper in the bracelet. [1]

71 Show a numerical setup for calculating the amount of heat released by the bracelet as it cooled on the desk. [1]

72 Explain, in terms of chemical activity, why copper is a better choice than iron to make the bracelet. [1]

Answers

69. The student's skin was obviously warmer than the initial temperature of the bracelet. According to the second law of thermodynamics, heat transfers from a higher temperature to a lower temperature. Hence, heat transfers from the student's skin to the bracelet warming up the bracelet.

70. To determine number of moles of copper:

Given mass=30.1 grams

Molar mass= 63.55 g/mol

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\n\n \text{Number of moles}=(30.1)/(63.55) =0.4736 \text { moles}$

Thus, the number of moles of copper is 0.4736.

71. Calculating the amount of heat released:

ΔH( heat released) = m Cp(ΔT)

= 30.1g(0.385 J/g. K)(33-19)K

ΔH= 162.23J

Thus, the amount of heat released is 162.23 J.

72. Copper is chemically less active than iron.

Copperdoes notdisplace iron from its solution since it is less reactive than iron. A more reactive metal displaces a less reactive metal from its solution.

Learn more:

brainly.com/question/25548593

69. The student's skin was obviously warmer than the initial temperature of the bracelet. According to the second law of thermodynamics, heat transfers from a higher temperature to a lower temperature hence heat transfers from the student's skin to the bracelet warming up the bracelet.

70. moles of copper=mass of copper/molar mass of copper
=30.1g/(63.55g/mol)= 0.4736 moles Cu

71. Delta H( heat released) = mCp(deltaT) = 30.1g(0.385 J/gK)(33-19)K = 162.23J

72. Copper is chemically less active than iron.

What does w represent

Answers

W is a variable that can be used to represent whole numbers or the first letter of an object in the problem. Example: If a house has 4 windows on each side and there’s 4 sides of the house, find W, or the amount of windows there are total. An example for how it could also be used as a whole number is: Find W in this problem, or the whole number. Hope this helps! :)

Answer:

It is used to represent whole numbers

Explanation:

What is in the center of our solar system ? Name three physical features of this object .

Answers

Answer: The Sun is present in the center of solar system whose features are color, mass and texture.

Explanation:

Our solar system consists of one star and 8 planets. The star is present in our solar system is the Sun and due to this star only, our solar system is named as such.

The planets present in our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

These planets revolve around the star which is present at the center of the solar system.

Three physical features of Sun are:

Color: The color of Sun is yellow.
Mass: The mass of the Sun is $1.98892* 10^(30)kg$
Texture: Due to the convectional currents, the texture of the whole surface of sun is granular.

Hence, the Sun is present in the center of solar system whose features are color, mass and texture.

The sun. Light, heat and radiation

As ice transforms into steam, A)new molecules are formed. B)the types of atoms are changed. C)energy is absorbed by the molecules. D)the mass of the molecules is increased.

Answers

This is an example of a substance changing state, a physical change, the molecules are changed, but the atoms themselves do not change, just their arrangement, and the mass of the molecules is the same. Therefor energy is absorbed by the molecules, as energy is required to change the state or physicality of a molecule structure.Hope this helps. Let me know if you need additional help!

The answer is C) energy is absorbed by the molecules.

Keisha finds instructions for a demonstration on gas laws.1. Place a small marshmallow in a large plastic syringe.
2. Cap the syringe tightly.
3. Pull the plunger back to double the volume of gas in the syringe.

Which best describes the purpose and outcome of the demonstration?

Answers

Since you couldn't even put the answer choices down, i'll give the unfortunate viewers who are confused, the answer.

It is C) Boyle's law since it is showing the relationship between pressure and volume.

The purpose of this experiment is to demonstrate the relationship between pressure and volume. Pulling the plunger back increases the volume of the gas in the syringe thereby increasing the size of the marshmallow but pressure is reduced. The relationship to be demonstrated is that pressure and volume have an inverse relationship.

When 11.12 g of neon is combined in a 100 L container at 80oC with 9.59 g of argon, what is the mole fraction of argon?

Answers

The correct answer for the question that is being presented above is this one: "0.3."

Here it is how to solve.
Molecular mass of Ar = 40
Molecular mass of Ne = 20
Number of moles of Ar = 9.59/40 = 0.239
Number of moles of Ne = 11.12/20= 0.556
Mole fraction of argon = 0.239/ ( 0.239 + 0.556) = 0.3

Other Questions

For the water molecule, oxygen is _______ electronegative than hydrogen. The difference in electronegativity signifies that the hydrogen-oxygen bond is _______. According to the electronegativity difference between the atoms in water, it would be appropriate to label hydrogen with the symbol, _______, and oxygen with the symbol, _______. Based on the electronegativity difference between carbon and oxygen, the bonds in carbon dioxide are _______.According to the electronegativity difference between the atoms in carbon dioxide, it would be appropriate to label oxygen with the symbol, _______, and carbon with the symbol, _______.Based on the electronegativity difference between carbon and hydrogen, the bonds in methane are _______.According to the electronegativity difference between the atoms in methane, it would be appropriate to label hydrogen with the symbol, _______, and carbon with the symbol, _______.

The radius of an atom of gold (Au) is about 1.35 Å.How many gold atoms would have to be lined up to span 9.5 mm ?

Ions can have a positive or negative charge. false or true

A change in which property of light will have no effect on whether or not the photoelectric effect occurs??? Frequently energy intensity and wavelength