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alex41 [277]
3 years ago
11

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. Currently the material used

to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. What is the energy in Joules for a photon of light at this wavelength?
Chemistry
1 answer:
AnnZ [28]3 years ago
7 0

ti\his answer is radiation

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Given the following equation: 8Fe+S8=8FeS
maxonik [38]

Answer:

a. 2954g of FeS

b. 1143g of FeS

Explanation:

Based on the reaction:

8 Fe + S₈ → 8 FeS

<em>8 moles of Fe reacts with 1 mole of S₈ to produce 8 moles of FeS</em>

<em />

a. 4.2mol sulfur produce:

4.2mol S₈ × ( 8 mol FeS / 1 mol S₈) = <em>33.6mol FeS</em>. As molar mass of FeS is 87.92g/mol, mass is:

33.6mol FeS × ( 87.92g / 1 mol FeS) = <em>2954g of FeS</em>

<em />

b. 13mol Fe produce:

13mol Fe × ( 8 mol FeS / 8 mol Fe) = <em>13mol FeS</em>. In mass:

13 mol FeS × ( 87.92g / 1 mol FeS) = <em>1143g of FeS</em>

5 0
3 years ago
W myFLVS
bazaltina [42]

Answer:

.. / -.. --- -. - / -.- -. --- .-- / .-- .... .- - / .. / .-- .- ... / - .... .. -. -.- .. -. --. / .-.. . .- ...- .. -. --. / -- -.-- / -.-. .... --- .. .-.. -.. / -... . .... .. -. -.. / -. --- .-- / .. / ... ..- ..-. ..-. . .-. / .- / -.-. ..- .-. ... . / .- -. -.. / .. / .- -- / -... .-.. .. -. -.. / - .... .-. ..- / .- .-.. .-.. / - .... .. ... / .- -. --. . .-. / --. ..- .-.. - / ... .- -.. -. . ... ... / -.-. --- -- .. -. --. / - --- / .... .- ..- -. - / -- . / ..-. --- .-. . ...- . .-. / .. / -.-. .- -. - / .-- .- .. - / ..-. --- .-. / - .... . / -.-. .-.. .. ..-. ..-. / .- - / - .... . / . -. -.. / --- ..-. / - .... . / .-. .. ...- . .-. .-.-.- / .. ... / - .... .. ... / .-. . ...- . -. --. . / - .... .- - / .. -- / ... . . -.- .. -. --. ..--.. / --- .-. / ... . . -.- .. -. --. / ... --- -- --- -. . / - --- / .- ...- . -. --. . / -- . ..--.. / ... - ..- -.-. -.- / .. -. / -- -.-- / --- .-- -. / .--. .- .-. .- -.. --- -..- / .. / .-- .- -. .- / ... . - / -- -.-- / ... . .-.. ..-. / ..-. .-. . . .-.-.-

Explanation:

5 0
3 years ago
Look at the periodic table.
zhuklara [117]

Answer:

Mg^{+2}

Explanation:

The oxidation state of S is (-2) and that of Mg is (+2) since Mg loses two electrons to S

5 0
3 years ago
1. Three
Bess [88]

Answer:

Explination:

Given Data:

                  Trail 1          Trial 2         Trial 3

Student A 448.0 cm 485.6 cm 463.4 cm

Student B 450.5 cm 441.3 cm         446.8 cm

Student C 422.6 cm 445.2 cm 432.7 cm

Accepted Value = 435.0 cm

Required:

A: Accurate measurement =?

B: Reason for the answer =?

C: Precise measurement =?

D: Reason for the answer =?

Solution:

Student A:

Trail 1: 435.0 cm – 448.0 cm = (13.0 cm greater than accepted value)

Trail 2: 435.0 cm – 485.6 cm = (50.6 cm greater than accepted value)

Trial 3: 435.0 cm – 463.4 cm = (28.4 cm greater than accepted value)

Student B:

Trail 1: 435.0 cm – 450.5 cm = (14.5 cm greater than accepted value)

Trail 2: 435.0 cm – 441.3 cm = (6.3 cm greater than accepted value)

Trial 3: 435.0 cm – 446.8 cm = (11.8 cm greater than accepted value)

Student C:

Trial 1: 435.0 cm – 422.6 cm = (12.4 cm less than accepted value)

Trial 2: 435.0 cm – 445.2 cm = (10.2 cm greater than accepted value)

Trial 3: 435.0 cm – 432.7 cm = (1.3 cm less than accepted value)

A: The 3rd trial of the student C is accurate measurement = 432.7 cm.

B: The 3rd value of students’ C measurement is accurate because it is quite near to the accepted value, i.e.  435.0 cm.

As we know that Accuracy refers to the closeness of a measured value to a standard or known value.

This value has only the difference of 1.3 cm.

435.0 cm – 432.7 cm = (1.3 cm less than accepted value)

All the other have larger difference which is as above.

___________________

Student A:

1. 448.0 cm – 485.6 cm = (37.6 cm far)

2. 485.6 cm – 463.4cm = (22.2 cm far)

Student B:

1. 450.5 cm – 441.3 cm = (9.2 cm far)

2. 441.3 cm – 446.8 cm = (5.5 cm far)

Student C:

1. 422.6 cm – 445.2 cm = (22.6 cm far)

2. 445.2 cm – 432.7cm = (12.5 cm far)

So,

C: The values of Student B are more precise.

D: As we know that Precision refers to the closeness of two or more measurements to each other.

The measurements of student C are more close to each other. The values are only 9.2 cm and 5.5 cm far from each other.

5 0
3 years ago
The faster the particles, the
otez555 [7]

Answer:

When for example, heating up an ice cube the particles of the ice start to vibrate fast enough to get separated into liquid caused from high temperature. So the answer is Higher.

4 0
3 years ago
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