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andrezito [222]
3 years ago
10

Which statements are true of heterogeneous mixtures? 1) They settle out. 2) The proportions of solute to solvent may vary. 3) Th

e solute is evenly distributed throughout. 4) They are composed of two solvents and two solutes. 1 and 2 2 and 4 3 only 2 only
Chemistry
1 answer:
VARVARA [1.3K]3 years ago
3 0

Answer:

1 and 2

Explanation:

Heterogeneous mixtures are basically refers to any solution that is not uniform in composition. A typical example is a solution of water and sand.

1)

By nature, they settle out. The denser component of the solution falls down and the lighter component stays up.

2)

The proportions may vary as it is a mixture. There is no fixed ratio of solute t solvent.

3)

The solute is not evenly distributed and this is why it is referred to as a non uniform mixture.

4)

They do not necessarily contain teo solvent and two solutes.

The correct options are option 1 and option 2 only.

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Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 9.50 MJ 9
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Answer:

709415.584 g

Explanation:

This is a heat capacity  problem. We use the formula below to calculate.

Q=mcΔT

where Q is the quantity of heat

           m is the mass of substance

           ΔT is the change in temperature of substance( T2-T1).

Q= 9.5MJ = 9.5*10^(6}J

C.P = 30.8J/(K.mol)

temperature of sodium increases by 10°C which means our final temperature in kelvin T2 will be 510K

initial temperature T1= 500K

m= Q/[c (T2-T1)]

m= 9.5*10^(6}/ {30.8(510-500)]

m= 30844.156 mol of Na

Converting to grams we multiply by the molar mass of Na.

molar mass of Na = 23

mass of Na=   30844.156 *23

                  =709415.584 g

7 0
3 years ago
What percentage of the atmosphere is carbon dioxide?.
stellarik [79]

Answer:

4%

Explanation:

the answer is 4% , hope this help

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Limestone has a density of 2.72g/cm3. What is the mass of 24.9 cm3of limestone?
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Answer:

density = mass ÷ volume

Explanation:

mass = volume × density

       =24.9 cm3 × 2.72 g / cm3

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Explanation:

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