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sleet_krkn [62]
2 years ago
14

Which of these terms best describes the following statement?

Chemistry
1 answer:
Xelga [282]2 years ago
5 0
Which of these terms best describes the following statement?"A solution of the unknown compound turned litmus paper blue" 
A. Hypothesis 
B. Model
C. Quantitative observations 
D. Qualitative observation- is the answer
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A 225-g sample of aluminum was heated to 125.5 oc, then placed into 500.0 g water at 22.5 oc. (the specific heat of aluminum is
Sidana [21]
when  heat gained = heat lost 

when AL is lost heat and water gain heat

∴ (M*C*ΔT)AL = (M*C*ΔT) water

when M(Al) is the mass of Al= 225g 

C(Al) is the specific heat of Al = 0.9 

ΔT(Al) = (125.5 - Tf) 

and Mw is mass of water  = 500g

Cw is the specific heat of water = 4.81 

ΔT = (Tf - 22.5) 

so by substitution:

∴225* 0.9 * ( 125.5 - Tf) = 500 * 4.81 * (Tf-22.5)

∴Tf = 30.5 °C
7 0
3 years ago
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What happens to iron when it melts?
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As iron heats up, the arrangement of its atoms changes several times before it melts. ... Iron is magnetic at room temperature, and previous work predicted that iron's magnetism favors its open structure at low temperatures, but at 770 degrees Celsius iron loses its magnetism.

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8 0
3 years ago
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what is the correct conversion factor by which to multiply to convert moles of nitrogen to moles of ammonium nitrate (NH4NO3)
Ostrovityanka [42]

Answer:

0.5

Explanation:

1 mole of ammonium nitrate contains 2 moles of nirogen

1 mole of nitrogen converts to 0.5  moles of ammonium nitrate

the conversation factor is 0.5

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3 years ago
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I need help ASAP!!!!! What happens to water when it changes to ice?
Gre4nikov [31]

- It's density increases

- mass increases

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2 years ago
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Complete the sentence indicating the number of protons and electrons in the given ion. Match the numbers in the left column to t
Cloud [144]

Answer: (Chlorine-35)

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Number of proton plus the number of electron gives the mass number.

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