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Zina [86]
3 years ago
9

In the chemical laboratory why do scientists use a mortar and pestle

Chemistry
1 answer:
OlgaM077 [116]3 years ago
4 0
To crsuh things, probs so they can dissolve them into a liquid
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23.6 g of calcium chloride (110.98) is dissolved in water in a calorimeter. T rose from 25.0°C to 38.7°C. Heat capacity of solut
Soloha48 [4]

Answer:

Enthalpy Change when 1 mole CaCl₂ dissolves

= - 81.13 kj/mole

Explanation:

Given information

    Mass of CaCl₂ = 23.6 g

Temperature changes from 25.0°C to 38.7°C

Heat capacity of solution & calorimeter (C) = 1258 J/°C

We know               Q = C x ΔT

                   ⇒ Heat released =  1258 x (38.7 - 25)

                                                = 1.7234 x 10⁴ J

                                                = 17.2 Kilo-joule

Thus 23.6 g is equivalent to 1.7234 x 10⁴ J or 17.2 Kilo-joule  of heat energy

Molar mass of calcium chloride (110.98)

Mole =\frac{Mass}{Molecular mass} = \frac{23.6}{110.98}  =0.212 mole

Enthalpy Change when 1 mole CaCl₂ dissolves

                      = \frac{-17.2}{0.212} kj/mol = -81.13 kj/mole

5 0
3 years ago
Faries in the stolen child are significant because
MatroZZZ [7]
So so confused uh jus listen to the other answer aha
5 0
3 years ago
A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperatur
Ratling [72]

Answer:T_f=33.85\°C

Explanation:

Hello,

In this case, we can write the following relationship, explaining that the lost by the hot water is gained by the cold water:

Q_{hot,W}=-Q_{cold,W}

Which in terms of mass, specific heat and temperatures, we have:

m_{hot,W}Cp_{W}(T_f-T_{hot,W})=-m_{cold,W}Cp_{W}(T_f-T_{cold,W})

Whereas the specific heat of water is cancelled out to obtain the following temperature, considering that the density of water is 1 kg/L:

T_f=\frac{m_{hot,W}T_{hot,W}+m_{cold,W}T_{cold,W}}{m_{hot,W}+m_{cold,W}}\\\\T_f=\frac{5.0kg*80\°C+60kg*30\°C}{5.0kg+60kg} \\\\T_f=33.85\°C

Regards.

4 0
3 years ago
25 POINTS <br> Part C<br> Record what you observe in these images showing the banks of the Dead Sea.
NikAS [45]

One of the most significant characteristics of the Dead Sea is its salinity level. The images show the rock salt deposits on the shore.

<h3>What are the characteristics of the characteristics of the Dead sea?</h3>

  • Location

The dead dea is the most salty landlocked lake on the Earth surface. It is located in the middle East, between Israel and Jordania. Its nort-south length is about 80 km and its east-west wide varies between 7 and 20 km.

  • Afluent

The Jordan river is the most significan afluent on the Dead Sea, from which it receives most of its water.

  • Water level

The Dead Sea is the deepest and lowest water body on the Earth, being its surface level 400 mt below the sea level.

Due to different reasons, during the last decades, there was a sharp and continuous drop in the water level. For this reason the lake surface is decreasing year after year.

  • Salinity

Among its many characteristics, one of them -and probably the most notorious one- is the salinity.  The percentage of dissolved salts in the lake is much higher than the one recorded in the oceans, seas or lakes of the globe. Its value is between 8 and 10 times higher the salt level of oceans.

The salts present in the lake are chlorine, magnesium, sodium, calcium, potassium, bromine and sulfur. Their concentration vary according to the strate and deph, but it tends to increase toward the lake’s bottom. The high salinity level provides an oily aspect, bleach taste, and extreme density.

Several rock salt deposits can be seen on the shore and near it. Salt columns can also be seen in deepest areas. These structures are becomming more common with time, as water evaporates, water provision from afluent sources decreases, and salinity near the surface increases.

  • Forms of life

Mainly due to the extreme salt level, which turns to be lethal, almost no forms of life inhabit these waters. Only some bacteria species and one algae species can be found in the water, and some plant species near the coasts.

What we can observe in these images are the rock salt deposits on the shore.

You can learn more about the Dead Sea at

brainly.com/question/11851245

brainly.com/question/26055281

8 0
2 years ago
What is the dew point
Rama09 [41]

Answer:

the atmospheric temperature (varying according to pressure and humidity) below which water droplets begin to condense and dew can form. (60 degrees fahrenheit

Explanation:

5 0
4 years ago
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