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3 years ago

How does the chemical structure of water change when it changes state?

1 answer:

4 0

When the water is heated, the water molecules bounce around and spread out.
When the water is normal, they are pretty close-knit but still flow around.
When the water is frozen, they are frozen in place and do not move.
I hope this helped :)

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A solution containing CaCl2 is mixed with a solution of Li2C2O4 to form a solution that is 2.1 × 10-5 M in calcium ion and 4.75

Mkey [24]

Answer: Option (b) is the correct answer.

Explanation:

The given data is as follows.

$[Ca^{2+}] = 2.1 \times 10^{-5}$ M

$[C_{2}O_{4}^{2-}] = 4.75 \times 10^{-5}$ M

$K_{sp} (CaC_{2}O_{4}) = 2.3 \times 10^{-9}$

As expression for $K_{sp}$ will be as follows.

$K_{sp} = [Ca^{2+}][C_{2}O^{2-}_{4}]$

= $2.3 \times 10^{-9}$

And, expression for ionic product will be as follows.

Q = $[Ca^{2+}][C_{2}O^{2-}_{4}]$

= $2.1 \times 10^{-5} \times 4.75 \times 10^{-5}$

= $9.975 \times 10^{-10}$

Since, it is shown here that ionic product is less that solubility product. Hence, no precipitate will form.

Thus, we can conclude that nothing will happen since Ksp > Q for all possible precipitants.

3 0

3 years ago

A scientist is performing an experiment on a powder. Which of the following is a sign that a chemical change has definitely occu

n200080 [17]

The powder catches fire. The rest of the choices pertains to physical changes on the powder. When the powder catches fire a chemical change happens. For example, if the powder is organic, carbon dioxide and water will result during the combustion.

7 0

3 years ago

Two objects are brought into contact Object 1 has mass 0.76 kg, specific heat capacity 0.87) g'c and initial temperature 52.2 'C

taurus [48]

Answer:

$T_F=77.4\°C$

Explanation:

Hello there!

In this case, according to the given information, it turns out possible to set up the following energy equation for both objects 1 and 2:

$Q_1=-Q_2$

In terms of mass, specific heat and temperature change is:

$m_1C_1(T_F-T_1)=-m_2C_2(T_F-T_2)$

Now, solve for the final temperature, as follows:

$T_F=\frac{m_1C_1T_1+m_2C_2T_2}{m_1C_1+m_2C_2}$

Then, plug in the masses, specific heat and temperatures to obtain:

$T_F=\frac{760g*0.87\frac{J}{g\°C} *52.2\°C+70.7g*3.071\frac{J}{g\°C}*154\°C}{760g*0.87\frac{J}{g\°C} +70.7g*3.071\frac{J}{g\°C}} \\\\T_F=77.4\°C$

Yet, the values do not seem to have been given correctly in the problem, so it'll be convenient for you to recheck them.

Regards!

4 0

3 years ago

A water sample is found to contain 59 ppm

NeX [460]

Explanation:

k so basically u gotta do 59/1000000 then multiply that by 972 which gives u 0.057348

8 0

4 years ago

What is the layer of the earth?

alukav5142 [94]

Earth can be divided into three main layers: the core, the mantle and the crust. Each of these layers can be further divided into two parts: the inner and outer core, the upper and lower mantle and the continental and oceanic crust. Both the inner and outer core are made up of mostly iron and a little bit of nickel.

4 0

3 years ago