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klio [65]
3 years ago
5

Describe two physical properties of matter and how those properties are measured.

Chemistry
1 answer:
Sonbull [250]3 years ago
4 0
Answer:

Density, solubility, melting point, boiling point, polarity, etc.

Density - Mass divided by volume = density (scale and beaker can be used)

Boiling point- Can be determined by the capillary method (where an inverted capillary is put in the liquid you’re finding out for and the liquid is heated)

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Which action changes the identity of substance referenced
Scilla [17]

Answer:

When iron turns to rust, the chemical identity of the iron changes. When you break ice, the ice is still ice

5 0
3 years ago
Calculate the equilibrium constant at 298 K for the reaction of formaldehyde (CH2O) with hydrogen gas using the following inform
Mariana [72]

Answer:

E. 8.08 x 10⁴.

Explanation:

Hello,

In this case, for the reaction:

CH_2O(g) + 2H_2(g)  \rightleftharpoons CH_4(g) + H_2O(g)

We can compute the Gibbs free energy of reaction via:

\Delta G\°=\Delta H\°-T\Delta S\°

Since both the entropy and enthalpy of reaction are given at 298 K (standard temperature), therefore:

\Delta G\°=-94.9kJ-(298K)(-224.2\frac{J}{K}*\frac{1kJ}{1000kJ} )\\\\\Delta G\°=-28.1kJ

Then, as the equilibrium constant is computed as:

K=exp(-\frac{\Delta G\°}{RT} )

We obtain:

K=exp(-\frac{-28.1kJ/mol}{8.314x10^{-3}\frac{kJ}{mol* K}}*298K )\\\\K=8.08 x10^4

For which the answer is E. 8.08 x 10⁴.

Best regards,

3 0
4 years ago
A root is an example of a/an-<br><br> A: tissue <br> B: cell type<br> C:organ<br> D:organism
konstantin123 [22]

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Explanation:

7 0
3 years ago
Read 2 more answers
А. B<br> Which of the following is true about the picture above? What would it be?
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Answer:

Container A is a solution and Container B is a colloid.

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Container A is a solution as the tyndall efffect is not present. You cannot see the light bean through the glass.

Container B is a suspension or a colloid as you can see the beam through the glass.

The first option proposes Container A is a colloid...this is not correct

The third option is not true as the tyndall effect is only displayed in container B

The fourth option is not correct the tyndall effect is not present in container A meaning it would not be a suspension or a colloid and you can see the tyndall effect in container B indicating its not a solution

8 0
4 years ago
During life body pH is ___ shortly after death the pH becomes ___ after time the pH becomes ___. (A) Acidic, neutral, basic (B)
Natalija [7]
(B) neutral, acidic, basic.
5 0
3 years ago
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