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4 years ago

6

A 2.0 ml sample of a colorless solution, when treated with a few drops of 2 m hydrochloric acid, forms a white precipitate which

dissolves when the solution is heated to boiling. the original solution could have contained which of the following cations?

1 answer:

Rainbow [258]4 years ago

6 0

Na+ions I think . . .

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State the colour of a solution of copper sulphate

dybincka [34]

The colour of copper sulphate solution is blue

5 0

3 years ago

4. An 82 kg hiker climbs Mt. Humphrey near Flagstaff. During a two hour period, the hiker's

bazaltina [42]

Answer:

$\Delta E = 434253.96\,J$ , $\Delta P = 60.313\,W$

Explanation:

The change in energy is given by the change in gravitational potential energy:

$\Delta E = m\cdot g \cdot \Delta h$

$\Delta E = (82\,kg)\cdot (9.807\,\frac{m}{s^{2}} )\cdot (540\,m)$

$\Delta E = 434253.96\,J$

The average rate of change in terms of time is approximately this:

$\Delta P = \frac{\Delta E}{\Delta t}$

$\Delta P = \frac{434253.96\,J}{(2\,h)\cdot (\frac{3600\,s}{1\,h} )}$

$\Delta P = 60.313\,W$

8 0

3 years ago

Complete the sentence: Each increase in pH value by 1 increases/decreases the hydronium ion concentration by a factor of _______

lora16 [44]

Answer:more

Explanation:

more or less can help you

5 0

4 years ago

An unknown nucleus has twice the volume of a nucleus with 73 nucleons. what is the atomic mass number of the unknown nucleus?

lyudmila [28]

The atomic mass number of the unknown nucleus is 128.

The relationship between the radius of the nucleus r and the atomic mass A is given by

$r ≈ (1.2 X 10^{-15}m )A^{\frac{1}{3} }$

If we assume that the nucleus is a sphere, the volume V is

$V = \frac{4}{3}\pi r^{3}$

let the volume of the nucleus having atomic mass number of 64 be V, then the volume of the unknown nucleus having atomic mass number A is written as

$=2 X \frac{4}{3} \pi (1.2 X 10^{-15})^{3} X 64\\\\=\frac{4}{3} \pi (1.2 X 10^{-15})^{3} X A$

Thus, we find that the atomic mass number of the unknown nucleus is A=128

Learn more about atomic mass nuclear charge:

brainly.com/question/13537766

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6 0

2 years ago

1. A cube of iron at 20.°C is placed in contact with a cube of copper at 60.°C. Which statement describes the initial flow of he

4vir4ik [10]

Answer:

D) Heat flows from the copper cube to the iron cube.

Step-by-step explanation:

The reason comes from the second law of thermodynamics:

Heat energy will flow spontaneously from an area of high temperature to one of low temperature.

When you bring two objects of different temperature into contact, heat energy always moves from the hotter to the cooler object.

The copper cube is hotter than the iron, so heat flows from the copper cube to the iron cube.

here hope this helps

4 0

4 years ago

Read 2 more answers