 admin # Which carbohydrate provides energy for cows but only dietary fiber for humans? A-cellulose B-starch C-glycogen D-sucrose

2 months ago

## Solution 1 Guest #756
2 months ago
A - Cellulose
Take care ^-^

## Solution 2 Guest #757
2 months ago
Starch serves energy for cows and diets withhold many starches

## 📚 Related Questions

Question
Water is sometimes removed from the products of a reaction by placing the products in a closed container with excess P4O10. Water is absorbed by the following reaction. P4O10 + 6H2O es001-1.jpg 4H3PO4 What is the mole ratio of water to H3PO4? Do not simplify the ratio. Hes001-2.jpgO:Hes001-3.jpgPOes001-4.jpg = :4
Solution 1
H2O:H3PO4 = 6:4.
I just took the test and got it right!

Solution 2

Answer : The correct answer for mole ratio of H₂O : H₃PO₄ = 6: 4 .

Mole ratio :

It is defined as mole of one substance to another substance in a balanced reaction . In the balanced reaction , the coefficient written before the substances are taken as moles of that substance.

The given balanced reaction between P₄H₁₀ and H₂O is :

P₄O₁₀ + 6 H₂O → 4 H₃PO₄

Mole of H₂O = 6

Mole of H₃PO₄ = 4

Hence mole ratio of Water : H₃PO₄ = 6 : 4

Question
A 98.0°C piece of cadmium (c=.850J/g°C) is placed in 150.0g of 37.0°C water. After sitting for a few minutes, both have a temperature of 38.6°C. What was the mass of the cadmium sample?
Solution 1
Assuming there was no heat leaked from the system, the heat q lost by cadmium would be equal to the heat gained by the water:
heat lost by cadmium = heat gained by the water
Since q is equal to mcΔT, we can now calculate for the mass m of the cadmium sample:
Question
Which is the correct equation for the reaction of magnesium with hydrochloric acid to produce hydrogen and magnesium chloride? a.mg + 2 hcl → h2 + mgcl2 b.mg + hcl → h + mgcl c.2 mg + 6 hcl → 3 h2 + 2 mgcl2 d.mg + 2 hcl → 2 h + mgcl2 e.mg + 3 hcl → 3 h + mgcl2?
Solution 1
Answer is: a. Mg + 2HCl → H₂ + MgCl₂.
Reduction hald reaction: 2H⁺ + 2e⁻→ H₂.
Oxidation half reaction: Mg
⁰ → Mg²⁺ + 2e⁻.
In this chemical reaction, magnesium lost two electrons (oxidation, change oxidation number from 0 to +2) and hydrogen gain that two electrons (reduction, change oxidation number from +1 to 0).
Question
What is the melting point of a solution in which 3.5 grams of sodium chloride is added to 230 mL of water?
Solution 1
We are going to use this equation:

ΔT = - i m Kf

when m is the molality of a solution

i = 2

and ΔT is the change in melting point = T2- 0 °C

and Kf is cryoscopic constant = 1.86C/m

now we need to calculate the molality so we have to get the moles of NaCl first:

moles of NaCl = mass / molar mass

= 3.5 g / 58.44

= 0.0599 moles

when the density of water = 1 g / mL and the volume =230 L

∴ the mass of water = 1 g * 230 mL = 230 g = 0.23Kg

now we can get the molality = moles NaCl / Kg water

=0.0599moles/0.23Kg

= 0.26 m

∴T2-0 =  - 2 * 0.26 *1.86

∴T2 = -0.967 °C
Solution 2

0.952 °C

Explanation:

The change in melting point is computed as:

ΔT = k*m*i

where ΔT is the difference between the melting point of water and of solution, k is a constant (1.86 °C*kg/mol for water), i is the van't Hoff factor (equal to 2 for sodium chloride because 2 ions are obtained after its dissolution), and m is the molality of the solution.

Molar mass of sodium chloride: 58.44 g/mol

Moles of of sodium chloride: mass / molar mass 3.5/58.44 = 0.059 mol

Density of water 1 kg/L

230 mL of water are equivalent to 0.23 L

mass of water: density * volume = 1*0.23 = 0.23 kg

Molality of the solution: m = moles of solute/ kg of solvent = 0.059/0.23 = 0.256

Finally:

ΔT = 1.86*0.256*2 = 0.952 °C

Water melting point: 0 °C

So, the solution melting point is: 0 - 0.952 = 0.952 °C

Question
Each astronaut produces 8.8 x 10^2 g CO2 per day that must be removed from the air on the shuttle. If a typical shuttle mission is 9 days, and the shuttle can carry 3.50 x 10^4 g LiOH, what is the maximum number of people the shuttle can carry for one mission
Solution 1
The answer to this would be:

The shuttle can carry a maximum of 4 astronauts for one mission.

2 LiOH + CO2 -----> Li2CO3 + H2O

(3.50 × 10^4 g LiOH) (1 mol LiOH/ 24 g LiOH) ( 1 mol CO2 / 2 mol LiOH) ( 44 g CO2 /1 mol CO2) = 32, 083.33 g CO2

32, 083.33 g / 9 (8.8 × 10^2) = 4

Question
Why does warm soda go flat faster than cold soda
Solution 1
The gas comes out more quickly when the can is warm because carbon dioxide is less soluble in warmer liquids.
Solution 2
Carbonation lasts longer in colder environments.
Question
A polar covalent bond will form between which two atoms? a. beryllium and fluorine (group 1 and group 7) b. hydrogen and chlorine (group 7) c. sodium and oxygen (group 1 and group 6) d. fluorine and fluorine (group 7)
Solution 1

Types of Bonds can be predicted by calculating the difference in electronegativity.

If, Electronegativity difference is,

Less than 0.4 then it is Non Polar Covalent

Between 0.4 and 1.7 then it is Polar Covalent

Greater than 1.7 then it is Ionic

For Be and F,

E.N of Fluorine          =   3.98

E.N of Beryllium        =   1.57

________

E.N Difference                2.41          (Ionic Bond)

For H and Cl,

E.N of Chorine           =   3.16

E.N of Hydrogen        =   2.20

________

E.N Difference                0.96          (Polar Covalent Bond)

For Na and O,

E.N of Oxygen          =   3.44

E.N of Sodium          =   0.93

________

E.N Difference                2.51          (Ionic Bond)

For F and F,

E.N of Fluorine          =   3.98

E.N of Fluorine          =   3.98

________

E.N Difference                0.00         (Non-Polar Covalent Bond)

Result:

A polar covalent bond is formed between Hydrogen and Chlorine atoms.

Question
As ice transforms into steam, Question options: new molecules are formed. the types of atoms are changed. energy is absorbed by the molecules. the mass of the molecules is increased.
Solution 1
Energy is absorbed by the molecules.
Question
Hydrocarbons are chain-like or ring-like molecules made of carbon and ________ atoms.
Solution 1
Hydrocarbons are made of Hydrogen and carbon atoms. An easy way to remember is in the name itself.
Question
Solid metals undergo greater thermal expansion than liquids do.
Solution 1

false

Explanation:

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130075
112100
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23213
22589
19607
17108
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10987
3389