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zysi [14]
4 years ago
12

Read this excerpt from Immigrant Kids. The second doctor watched for contagious and infectious diseases. He looked especially fo

r infections of the scalp and at the eyelids for symptoms of trachoma, a blinding disease. Since trachoma caused more than half of all medical detentions, this doctor was greatly feared. He stood directly in the immigrant's path. With a swift movement, he would grab the immigrant's eyelid, pull it up, and peer beneath it. If all was well, the immigrant was passed on. The purpose of this excerpt is to provide information about eye doctors and to explain how they traveled the immigrant’s path. to provide information about eye disease and to explain its medical treatment. to provide information about scalp infections and to explain how they can be prevented. to provide information about trachoma and to explain how it was diagnosed among immigrants.
Chemistry
2 answers:
Mice21 [21]4 years ago
7 0

up until this is 6AM I 66inches the sending 66

Explanation:

tight ends and I 6AM the sending o the sending the

wariber [46]4 years ago
5 0

Explanation:

the answer is D. I just took the test

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According to the Kinetic Molecular Theory, all substances contain entities that are in a continuous random motion.Could you plea
Romashka-Z-Leto [24]

The answer is a bit ambiguous since the kinetic molecular theory refers to the behavior of gas molecules, and says that these are in continuous and random motion. All substances with certain conditions of temperature and pressure can be taken to a gaseous state, so I could tell you that this answer is true.

3 0
2 years ago
Identify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral.
zimovet [89]

Answer:

Number of neutrons: 44

Number of protons: 34

Number of electrons: 36

Explanation:

The atomic number of Se (Selenium) is 34

Mass number is 78

Number of neutrons = mass number - atomic number = 78 - 34 = 44

Number of protons is the same as the atomic number

Number of protons = 34

Selenium ion has a charge of -2. This means it accepts two more electrons

Number of electrons = atomic number + 2 = 34 + 2 = 36

5 0
4 years ago
What is the molar mass of a gas with a density of 3.50 g/L at a
Kruka [31]

Answer:

  • <u>104 g/mol</u>

Explanation:

Use the ideal gas equation:

      pV=nRT

Where:

  • p is pressure: 0.950atm
  • V is volume: unknown
  • n is number of moles: unknown
  • R is the universal constat of gases: 0.08206 atm.liter/ (K.mol)
  • T is the absolute temperature: 345K

Use the <em>molar mass</em> of the gas to include the density in the formula:

  • molar mass = mass in grams / number of moles

  • ⇒ mass in grams = number of moles × molar mass

  • density = mass in grams / volume

  • ⇒ density = number of moles × molar mass / volume

  • density = (n/V) × molar mass

  • ⇒ n/V = density / molar mass

Clear n/V from the gas ideal equation and subsittute with density/molar mass:

  • n/V = p/(RT)
  • density / molar mass = n/V
  • density/molar mass = p/(RT)
  • molar mass = density × RT / p

Now you can subsitute the data:

molar mass = (3.50g/liter) × 0.08206 atm.liter/(K.mol) × 345K / 0.950 atm

  • molar mass = 104.3 g/mol

  • Round to the nearest whole number: 104g/mol ← answer
3 0
3 years ago
State why vulcanologist make predications about when a volcano will erupt
olasank [31]

Answer:

They want to know how long it has been since it last erupted.

Explanation:

Scientists study a volcano's history to try to predict when it will next erupt.  They also want to know the time span between its previous eruptions

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How is an element represented in a chemical formula?
photoshop1234 [79]

Answer:

In a chemical formula, the elements in a compound are represented by their chemical symbols, and the ratio of different elements is represented by subscripts.

Explanation:

3 0
3 years ago
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