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kherson [118]
3 years ago
12

A fifth-grade science class puts half of a white tablet in a test tube with 10 milliliters (mL) of water at 21°C (70°F). The tab

let bubbles rapidly for three minutes until it is gone. Students record the final temperature at 20°C (68°F). Which choice best identifies evidence that a chemical reaction occurred?
Chemistry
2 answers:
Sloan [31]3 years ago
7 0

Answer:

i think it table broke in half

Explanation:

frosja888 [35]3 years ago
5 0

Answer: it would be change in water temperature

Explanation: because the change in the water is the temperature and its is

evaporation

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The enthalpy of vaporization for water is 40.67 kJ/mol and the enthalpy of fusion for water is
S_A_V [24]

Answer:

\Delta H_{dep}=-46.68kJ/mol

Explanation:

Hello!

In this case, since vaporization is the processes by which a liquid goes to the gas phase, fusion by which a solid goes to liquid and deposition by which a gas goes to solid; we infer that the following set up relates the enthalpies associated to each process:

\Delta H_{fus}+\Delta H_{vap}=-\Delta H_{dep}

Because deposition goes from a state with more energy to a state with less energy, therefore it is negative; in such a way, by plugging in we obtain:

\Delta H_{dep}=-(\Delta H_{fus}+\Delta H_{vap})\\\\\Delta H_{dep}=-(6.01kJ/mol+40.67kJ/mol)\\\\\Delta H_{dep}=-46.68kJ/mol

Best regards!

6 0
3 years ago
A 1.00 L flask is filled with 1.15 g of argon at 25 ∘C. A sample of ethane vapor is added to the same flask until the total pres
tatiyna

Answer:

The partial pressure of argon in the flask = 71.326 K pa

Explanation:

Volume off the flask = 0.001 m^{3}

Mass of the gas = 1.15 gm = 0.00115 kg

Temperature = 25 ° c = 298 K

Gas constant for Argon R = 208.13 \frac{J}{kg k}

From ideal gas equation P V = m RT

⇒ P = \frac{m R T}{V}

Put all the values in above formula we get

⇒ P = \frac{0.00115}{0.001} × 208.13 × 298

⇒ P = 71.326 K pa

Therefore, the partial pressure of argon in the flask = 71.326 K pa

4 0
4 years ago
How many elements are in “CO2”
aleksandr82 [10.1K]
2 elements, the C is Carbon and the O is oxygen.
3 0
3 years ago
Read 2 more answers
Which of the following is the abbreviation for a nucleotide containing the nitrogenous base cytosine, a hydrogen at the 2’ carbo
zvonat [6]

Answer:

dCDP

Explanation:

The nucleotide has hydrogen at it second carbon which means that it has deoxy pentose sugar which is written in small d as prefix.

The nitrogenous base is cytosine and it contains 2 phosphate groups which are attached to the 5 carbon of the pentose sugar means it is cytosine diphosphate.

<u>So, the abbrevation of the molecule is : dCDP</u>

4 0
4 years ago
After 1911, most scientists accepted the theory that the nucleus of an atom was very dense and very small and had a positive cha
Scorpion4ik [409]

Answer:

I believe it is D

Explanation:

since Rutherford's explanation, when he made it in 1911, was that scattering was caused by a hard, dense court to centre of the Adam, which is the nucleus and he used Alpha particles to observe the scattered backwards from a gold foil

4 0
3 years ago
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