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MAXImum [283]
2 years ago
7

Jodie is studying the sleeping habits of various types of animals. She wants to know how long each type of animal sleeps during

the day.
Jodie puts each of the animals in a cage with food, water, and light. However, she cannot stay to watch the animals all day.

Which of the following tools would be most helpful to Jodie's experiment?
A.
a tape recorder
B.
a video camera
C.
a metric ruler
D.
a triple beam balance
Chemistry
1 answer:
LUCKY_DIMON [66]2 years ago
3 0
A. You want to check the sleeping schedule of the animals including the time.
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Calculate the mass in grams of carbon dioxide produced from 11.2 g of octane (C8H18) in the reaction above.
Ray Of Light [21]

Answer:

34.6g

Explanation:

Given parameters:

Mass of Octane  = 11.2g

  Reaction expression;

      2C₈H₁₈  + 25O₂  →  16CO₂  + 18H₂O

Mass of octane = 11.2g

Unknown:

Mass of carbon dioxide produced  = ?

Solution:

From the balanced reaction equation;

         2 mole of octane produced 16 moles of carbon dioxide

From the given specie, let us find the number of moles;

    Number of moles  = \frac{mass}{molar mass}  

 Molar mass of C₈H₁₈   = 8(12) + 18(1) = 114g/mole

Number of moles of octane  = \frac{11.2}{114}   = 0.098mole

   

    2 mole of octane produced 16 moles of carbon dioxide

    0.098 mole of octane will produce \frac{0.098 x 16}{2}   = 0.79mole of CO₂

Mass of CO₂ = number of moles x molar mass

           Molar mass of CO₂ = 12 + 2(16)  = 44g/mol

Mass of CO₂  = 0.79 x 44  = 34.6g

8 0
3 years ago
Rewrite each equation below with the delta H value included with either the reactants or the products and identify the reaction
yanalaym [24]
A) 2H₂(g) + O₂(g) → 2H₂O(l) + 285.83 kJ
Exothermic

B) 2Mg + O₂ → 2MgO + 1200kJ
Exothermic
5 0
3 years ago
What word is used to refer to a group of organ systems working together?
kotegsom [21]

Answer:

1

Explanation:

in my opinion,The answer would be organism

please mark me as brainliest

6 0
3 years ago
What is the job of a scientist?
Rudiy27

Answer:

B. To ask and answer scientific questions

5 0
3 years ago
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On the basis of which property of the elements are they divided into metals and non metals?
kicyunya [14]
The answer is the elements in a periodic table.  <span>On the basis of the elements in the periodic table, they are divided into metals and non metals. </span>
8 0
3 years ago
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