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Leokris [45]
3 years ago
12

Which experiment best shows water’s ability to act as a solvent? raise the temperature of water and record its boiling point. fr

eeze a flexible vessel of water and watch it expand. pour an ionic solid into water and see if it vanishes. place a leaf on top of the surface of water and see if it sinks?
Physics
2 answers:
IrinaVladis [17]3 years ago
8 0
The vanishing of an ionic solid (like table salt) would be an example of acting like a solvent
IceJOKER [234]3 years ago
4 0

Answer: pour an ionic solid into water and see if it vanishes.

Explanation: The solubility of substances is governed by: Like dissolves like, which states that polar compounds are soluble in polar solvents and non polar compounds are soluble in non polar solvents.

Ionic compounds are formed by combination of positively charged cations and negatively charged anions which are held by strong coloumbic forces.When ionic compounds are dissolved in water, the ions are dissociated due to high dielectric constant of water and thus dissolve in water.

Water being a polar solvent is able to dissolve ionic or polar compounds in it.

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A 248-g piece of copper is dropped into 390 mL of water at 22.6 °C. The final temperature of the water was measured as 39.9 °C.
Sedaia [141]

Answer:

335°C

Explanation:

Heat gained or lost is:

q = m C ΔT

where m is the mass, C is the specific heat capacity, and ΔT is the change in temperature.

Heat gained by the water = heat lost by the copper

mw Cw ΔTw = mc Cc ΔTc

The water and copper reach the same final temperature, so:

mw Cw (T - Tw) = mc Cc (Tc - T)

Given:

mw = 390 g

Cw = 4.186 J/g/°C

Tw = 22.6°C

mc = 248 g

Cc = 0.386 J/g/°C

T = 39.9°C

Find: Tc

(390) (4.186) (39.9 - 22.6) = (248) (0.386) (Tc - 39.9)

Tc = 335

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3 years ago
A 2-column table with 4 rows. The first column labeled substance has entries calcium chloride, calcium bromide, calcium carbonat
yanalaym [24]

Answer:

SAMPLE C

Explanation:

5 0
4 years ago
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A 0.40-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path. If the maximum tension
hichkok12 [17]

To solve this problem we will apply the concepts given from the circular movement of the bodies for which we have that the centripetal Force is defined as a product between the mass and the velocity squared at the rate of rotation, mathematically this is

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v = Velocity

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Our values are given as

m = 0.4kg\\r = 0.75m\\F_c = 450N

Rearranging to find the velocity we have that,

F_c = \frac{mv^2}{r}

v = \sqrt{\frac{F_c * r}{m}}

v = \sqrt{\frac{450 * 0.75}{0.4}}

v = 29.0474m/s

Therefore the  maximum speed can the mass have if the string is not to break is 29m/s

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Which of the following statements about transition metals is true?
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It would probably be C
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What type of rays would you expect to be used frequently at a hospital to make medical diagnoses?
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X rays because to see your bones
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