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RSB [31]
3 years ago
9

The flow of energy through living systems can be modeled as food chains, food webs, or energy pyramids. The energy organisms nee

d to live and grow first enters the ecosystem when which of the following occurs? A. Plants take in light energy from the sun B. Decomposed break down dead organisms. C. Primary consumers East plants for food D. Secondary consumers eat primary consumers
Chemistry
1 answer:
aliya0001 [1]3 years ago
4 0

Answer:

A.......

Explanation:  The sun is the main source of energy

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10.0 grams of water are heated during the preparation of a cup of coffee 1.0x 103 j of the heat are added to the water. which is
nirvana33 [79]

<u>Answer:</u> The final temperature of the coffee is 43.9°C

<u>Explanation:</u>

To calculate the final temperature, we use the equation:

q=mC(T_2-T_1)

where,

q = heat released = 1.0\times 10^3J=1000J

m = mass of water = 10.0 grams

C = specific heat capacity of water = 4.184 J/g°C

T_2 = final temperature = ?

T_1 = initial temperature = 20°C

Putting values in above equation, we get:

1000J=10.0g\times 4.184J/g^oC\times (T_2-20)\\\\T_2=43.9^oC

Hence, the final temperature of the coffee is 43.9°C

8 0
3 years ago
Which of the following is a correct inference that one can make about the burning of gasoline?
nikitadnepr [17]
Well first we can say that B. and D. are out BC they are physical changes we are looking for chemical changes when burning gas, the gas is burning and converting into heat energy AKA FIRE!!!. so the answer is indeed (A. <span>Chemical bonds are broken and others are formed.)
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3 0
3 years ago
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An ideal gas is made up of gas particles that
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Answer:

no it is mad out of gas

Explanation:

4 0
3 years ago
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The solubility of nacl at 30°c is 36.3 g/100 g of water. what mass of nacl is contained in a saturated solution that contains 30
sleet_krkn [62]
Because a solubility is calculated for saturated solutions we can write:

36.3 g NaCl ---100g water
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4 years ago
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If 17.4 mL of 0.800 M HCl solution are needed to neutralize 5.00 mL of a household ammonia solution, what is the molar concentra
Verizon [17]
NH3  +HCl  ---->  NH4Cl

moles   of  HCl  used =    (0.8  x  17.4) /1000=  0.0139 moles
by  use   of reacting  ratio  between  HCl  to   NH4Cl    which is 1:1    therefore  the  moles   of  NH4Cl  is  also  =  0.0139 moles
molar   concentration  =  moles  /volume  in  liters 

molar  concentration  is  therefore=    (0.0139/5)  x1000 =  2.7 M
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3 years ago
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