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LekaFEV [45]
3 years ago
5

Please help me thanks so much!?!?!?

Chemistry
2 answers:
Marina86 [1]3 years ago
8 0

Answer:

Lighting the stove and cooking the meat are both chemical changes.

Explanation:

Both fire and cooking are chemical changes.

TiliK225 [7]3 years ago
5 0

Answer:

the second one

Explanation:

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245 g water sample initially at at 32 oC absorbs 17 kcal of heat. What is the final temperature of water?
steposvetlana [31]

Answer:62.66°C or 235.66K

Explanation:Q=McpT, the energy was given in calories so you first convert to Joules by multiplying the value in calories by 4.184J.

17*4.184=71.128kJ.

71.128kJ=mcpT

71.128kJ=245*4.187*(T-Tm)

Tm is the final temperature of the mixture. The T is the temperature given which should be converted to Kelvin by adding 273...T=32+273=305K.

71128J=245*4.187*(305-Tm)

71128=312873.575-1025.815Tm

1025.815Tm=312873.575-71128

1025.815Tm=241745.58

Tm=241745.58/1025.815

Tm=235.66K

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3 years ago
What does erosion do?
Westkost [7]
I think the answer is A. breaks rocks apart. 
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3 years ago
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How many grams are 0.5 moles of NaCl???
elena-14-01-66 [18.8K]

Answer:Respuesta. El peso molecular de NaCl es 58gr que equivale a 1 mol. g? hay 0,5mol queda 29gr

Explanation:

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3 years ago
Hydrogen has three naturally occurring isotopes which figure into the average atomic mass found on the periodic table (1.00974):
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The number following the name of the element is the number of subatomic particles inside the nucleus of the atom. This means that it is the mass number of the isotope. The average atomic mass of the element is the sum of the products of the percentage abundance and mass number of the naturally occurring isotopes. 

Since, the average atomic mass of the hydrogen is nearest to 1 then, the most abundant isotope should be hydrogen-1. 
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