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3 years ago

In what circumstances do scientists use observational research and opinion based research?

1 answer:

7 0

The circumstances when scientists use observational research and opinion based research is when they include animals or things that cannot control for a product. Observational research is a type of research which only observes ongoing behavior and studies about it and the results only rely on the behavior observed.

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A 25.0-g sample of ice at -6.5oC is removed from the freezer and allowed to warm until it melts. Given the data below, select al

alukav5142 [94]

Answer:

B, D

Explanation:

The strategy here is to realize that the ice will be taken from -6.5 ºC to OºC where it will melt.

Lets call q₁ the heat required to bring the ice to 0ºc, q₂ the heat required to bring the phase change from solid to liquid.

q₁ is calculated from the expression

q₁ = s x m x ΔT where m is the mass, s the specific heat of ice ( 2.09 J/gºC ) and ΔT the change in temperature.

q₂ the fusion enthalpy change is calculated from the expression:

q₂ = C x ΔT

where C is the specific heat for the phase change , in this case named AH given in kJ/mol.

We are given all the data needed to calculate q₁, q₂ and qtotal ( q₁ + q₂ )

q₁ = 25.0 g x ( 2.09 J/gºC) x ( 0 - ( -6.5 ºC ) )

q₁ = 339.6 J = 0.339 kJ

q₂ = (25 g/ 18 g/mol) x 6.02 kJ/mol = 1.39 x 6.02 kJ = 8.36 kJ

qtotal = 0.339 kJ + 8.36 kJ = 8.70 kJ

with these calculations, we can now proceed to answer the question:

(a) False AH is theheat capacity for the melting.

(b) True as we determined above

(d) True as calculated above

(e) False as determined in our calculations

7 0

3 years ago

What's mole in 34g of H2O<br><br><br>

enyata [817]

Answer:

I hope you have the answer now

Explanation:

u an

3 0

3 years ago

How much heat is added if 0.814g of water increase in temperature by 0.351 degree C

steposvetlana [31]

Answer:

1·199 J

Explanation:

Given

Mass of water = 0·814 g = 0·814 × $10^{-3}$ kg

Increase in temperature = 0·351 °C

Let the amount of heat added be Q J

Formula for heat added is

where Q is the amount of heat transferred

m is the mass

s is the heat capacity

ΔT is the change in temperature

Heat capacity of water = 4200 J/kg °C

Applying the formula for heat added

Q = 0·814 × $10^{-3}$ × 4200 × 0·351 = 1·199 J

∴ Amount of heat added = 1·199 J

8 0

4 years ago

When are ions formed?

jek_recluse [69]

Ions are Formed when atoms lose or gain electrons in order to fulfill the octet rule and have full outer valence electron shells.

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4 years ago

What does non polar mean?

Hoochie [10]

When atoms bond together to form molecules, they share or give electrons. If the electrons are shared equally by the atoms, then there is no resulting charge and the molecule is nonpolar.

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3 years ago