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Ymorist [56]
3 years ago
15

Joan wants to test if salt lowers the temperature at which water boils. In two or more complete sentences, describe the best way

for Joan to develop a hypothesis for this situation. Write your answer in the essay box below.
Chemistry
1 answer:
Alexeev081 [22]3 years ago
6 0
Put a thermometer in the water and wait until it boils. When it boils record the temperature and compare it to the normal water boiling point.
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A small bubble rises from the bottom of a lake where the temperature and pressure are 4.0 C and 3.0 atm, to the water’s surface,
Varvara68 [4.7K]

Answer:

The final volume of the bubble is 7.13 mL.

Explanation:

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1 = initial pressure of gas = 3 atm

P_2 = final pressure of gas = 0.95 atm

V_1 = initial volume of gas = 2.1 mL=0.0021 L

V_2 = final volume of gas = ?

T_1 = initial temperature of gas = 4^oC=273.15+4K=277.15 K

T_2 = final temperature of gas = 25^oC=273.15+25 k=298 .15 K

Now put all the given values in the above equation, we get:

\frac{3 atm\times 0.0021 L}{277.15 K}=\frac{0.95 atm\times V_2}{298.15 K}

V_2=\frac{3 atm\times 0.0021 L\times 298.15 K}{277.15 K\times 0.95 atm}=0.00713 L = 7.13 mL

The final volume of the bubble is 7.13 mL.

5 0
3 years ago
The molality of a solution that is made by dissolving a certain mass of benzene in 20.6g of carbon tetrachloride is 0.529m. How
antiseptic1488 [7]
Molality of solution = 0.529 m

mass solvent in kg = 20.6 g => 20.6 / 1000 => 0.0206 kg

number of moles = molality x mass solvent

= 0.529 x 0.0206 => <span> 0.0108 mol benzene 
</span>
hope this helps!

6 0
3 years ago
Read 2 more answers
PLEASE HELP WILL GIVE BRAINLIEST
OLEGan [10]

Answer:

c option is correct ...

6 0
3 years ago
Read 2 more answers
Which of the following is a unit of volume?
ehidna [41]

Answer:

O C. A meter

Explanation:

The SI unit of volume is the cubic meter (m 3 ), which is the volume occupied by a cube that measures 1 m on each side.

4 0
3 years ago
Tell all of the properties that are used to identify minerals and EXPLAIN each.
jekas [21]

Answer:

Color-Color in minerals is caused by the absorption, or lack of absorption, of various wavelengths of light. The color of light is determined by its wavelength. ... Some elements have electrons that absorb certain wavelengths or colors.

Streak-The streak of a mineral is the color of the powder produced when it is dragged across an un-weathered surface. ... Small amounts of an impurity that strongly absorbs a particular wavelength can radically change the wavelengths of light that are reflected by the specimen, and thus change the apparent color.

Hardness-The hardness of minerals is diagnostic because the hardness is determined by the strength of bonds and the structure of the mineral lattice. Hardness is basically the stress required to create and grow extended lattice defects such as micro-fractures, stress twins, and dislocations.

Cleavage-The tendency of a mineral to break along flat planar surfaces as determined by the structure of its crystal lattice. These two-dimensional surfaces are known as cleavage planes and are caused by the alignment of weaker bonds between atoms in the crystal lattice.

7 0
3 years ago
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