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salantis [7]
3 years ago
14

Select the correct text in the passage.

Chemistry
2 answers:
xxMikexx [17]3 years ago
7 0

Answer:

The answers are

1. Scientists use seismometers to measure the earthquake activity that occurs beneath a volcano. They then predict the eruption of that volcano.

2. Scientists measure the amount of these gases to determine the amount of magma present in the volcanic reservoir.  

Explanation:

When a volcano is near eruption Earthquake activity gets stronger and stronger. Scientists use a wide variety of techniques to monitor volcanoes, including seismographic detection of the earthquakes and tremor that almost always precede eruptions, precise measurements of ground deformation that often accompanies the rise of magma, changes in volcanic gas emissions, and changes in gravity and.

Scientists can use the FTIR or Fourier Transform Infrared Spectrometer to measure dissolved volatile concentrations as described above or can be used to measure several gases emitted from a volcano simultaneously. The device can be used both as an open-path or closed-path system. I had just taken the test and got the question right as well

sukhopar [10]3 years ago
6 0

Answer:

1. Scientists use seismometers to measure the earthquake activity that occurs beneath a volcano. They then predict the eruption of that volcano.

2. Scientists measure the amount of these gases to determine the amount of magma present in the volcanic reservoir.  

Explanation:

Give me brainliest!!!!

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Calculate the Ka for a 0.3 M solution of HA (unknown weak acid) if the pH = 3.65. The reaction can be modelled as HA (aq) + H2O
Levart [38]

The Ka : 1.671 x 10⁻⁷

<h3>Further explanation</h3>

Given

Reaction

HA (aq) + H2O (l) ←→ A- (aq) + H3O+ (aq).

0.3 M HA

pH = 3.65

Required

Ka

Solution

pH = - log [H3O+]

\tt [H_3O^+]=10^{-3.65}=2.239\times 10^{-4}

ICE method :

HA (aq)        ←→   A- (aq)    +    H3O+ (aq).

0.3                           0                 0

2.239.10⁻⁴           2.239.10⁻⁴   2.239.10⁻⁴

0.3-2.239.10⁻⁴    2.239.10⁻⁴    2.239.10⁻⁴

\tt Ka=\dfrac{[H_3O^+][A^-]}{[HA]}\\\\Ka=\dfrac{(2.239.10^{-4}){^2}}{0.3-2.239.10^{-4}}\\\\Ka=1.671\times 10^{-7}

5 0
3 years ago
What is the volume of a substance with a mass of 64.9 g/ and a density of 2.1 g/ml?
maks197457 [2]
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3 years ago
Use the periodic table to find the atomic weight for tin (Sn).<br> 50<br> 119<br> 170
trapecia [35]

Answer:

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Explanation:

Tin is present in group sixteen. Its atomic number is 50 and atomic weight is 119 amu.

The atomic number is the number of electrons or number of protons. The atomic mass is equal to the sum of number of protons and number neutrons.

Tin have 50 protons and 69 neutrons.The atomic weight will be 50+69 = 119 amu.

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons.

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4 years ago
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PilotLPTM [1.2K]

Answer:

i think A.

Explanation:

bc B. makes the molecules hight temp = move faster = more collisions = higher rate, C. it's use is to make reactions rates increase, D. somthung abt more surface area and easier collisions

6 0
4 years ago
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5 0
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