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jok3333 [9.3K]
4 years ago
9

The early universe was composed mainly of which two elements? hydrogen and helium carbon and oxygen hydrogen and oxygen carbon a

nd iron
Chemistry
2 answers:
mrs_skeptik [129]4 years ago
7 0
It took 380,000 years for electrons to be trapped in orbits around nuclei, forming the first atoms. These were mainly helium and hydrogen, which are still by far the most abundant elements in the universe.

Hope this will help you.
Pepsi [2]4 years ago
3 0

Answer:

c.

Hydrogen and Helium

Explanation:

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The decayed organic material that gives soil its dark brown or black color is called
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Option B. Humus. Its dark color is due to the high content of carbon.

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3 years ago
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Why do the voices sound different when you listen to them through the wall?
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Answer:

Sound waves travel at different speeds when traveling through different materials

Explanation:

This is because in water the particles are more closely packed together, therefore making the sound travel faster and sound louder. The opposite is the same for air.

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What is the name of the salt with the structure K2S?
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Answer:

Potassium sulfide

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Explanation:

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Which bones are included in the appendicular skeleton?
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4 years ago
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A sample of food containing 27 g of fat, 48 g of carbohydrates and 20 g of protein is burned in a bomb calorimeter. In a perfect
rosijanka [135]

Answer:

38.3958 °C  

Explanation:

As,

1 gram of carbohydrates on burning gives 4 kilocalories  of energy

1 gram of protein on burning gives 4 kilocalories  of energy

1 gram of fat on burning gives 9 kilocalories of energy

Thus,

27 g of fat on burning gives 9*27 = 243 kilocalories of energy

20 g of protein on burning gives 4*20 = 80 kilocalories  of energy

48 gram of carbohydrates on burning gives 4*48 = 192 kilocalories  of energy

Total energy = 515 kilocalories

Using,

Q=m_{water}\times C_{water}\times (T_f-T_i)

Given: Volume of water = 23 L = 23×10⁻³ m³

Density=\frac{Mass}{Volume}  

Density of water= 1000 kg/m³

So, mass of the water:  

Mass\ of\ water=Density \times {Volume\ of\ water}  

Mass\ of\ water=1000 kg/m^3 \times {0.023\ m^3}  

Mass of water  = 23 kg

Initial temperature = 16°C  

Specific heat of water = 0.9998 kcal/kg°C  

515=23\times 0.9998\times (T_f-16)

Solving for final temperature as:

<u>Final temperature = 38.3958 °C  </u>

8 0
3 years ago
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