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3 years ago

PLEASE HELP!!!

Chemistry

2 answers:

Natalija [7]3 years ago

8 0

Answer:

aaaaaaaaaa bbbbbccccddddeeeffffggghhhhiiijjjkkkklllmmmnnnnooppppqqqqqrrrssstttuuuuvvvvvwwwwwyyyyxxxxxttttuuuuuuvvvvv

Explanation:

julsineya [31]3 years ago

7 0

A wet barometer puts a vacuum above a liquid and applies air pressure to the surface of the liquid - the height of the liquid above to reservoir surface is the measure of air pressure. The liquid can be in a J tube with an open end or a straight tube in a pool. Air pressure will support about 30" of mercury or about 32 feet of water.
A dry barometer uses a sealed chamber with a diaphragm with a lever touching it or a spiral tube with a link connected to a display needle. In the former, the slight movement of the diaphragm with changed pressure is translated to a large movement of the end of the lever movement across the scale. In the spiral, the expanding/contracting air inside the tube changes its shape and pulls the needle over. 
In both case, the scale of pressure for the needle has to be calibrated to the design. 
- 
How Tropical Cyclones are Observed 
* Direct measurements of tropical storm and hurricane dimensions and wind speeds are taken primarily by reconnaissance 
aircraft, although ships and buoys also take important measurements. Once a hurricane is near and/or on land, Automated 
Surface Observation Systems (ASOS) provide surface conditions, and radio sondes take upper air measurements. 
* Indirect observational methods include satellite imagery and Doppler radar. In particular, satellites have greatly improved 
our ability to monitor and understand hurricanes. Radar data are important once the storm comes close to shore 
and after landfall for forecasting hurricane-related weather. 

I hope this is helpful.

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Suppose a gas starts with a volume of 4.52L, temperature of 23 C, and pressure of 102,00 Pa. If the volume changes to 4.83L and

ivanzaharov [21]

Answer:

The answer to your question is P2 = 84.16 kPa

Explanation:

Data

Volume 1 = V1 = 4.52 L Volume 2 = V2 = 4.83 l

Pressure 1 = P1 = 102 kPa Pressure 2 = P2 = ?

Temperature 1 = T1 = 23°C Temperature 2 = T2 = -12°C

Process

1.- Convert the temperature to °K

Temperature 1 = 23 + 273 = 296°K

Temperature 2 = -12 + 273 = 261°K

2.- Use the Combined Gas law to solve this problem

P1V1/T1 = P2V2/T2

-Solve for P2

P2 = P1V1T2 / T1V2

-Substitution

P2 = (102)(4.52)(261) / (296)(4.83)

-Simplification

P2 = 120331.44 / 1429.68

-Result

P2 = 84.16 kPa

8 0

3 years ago

Write the TOTAL IONIC EQUATION between zinc and hydrochloric acid.

Andreyy89

Answer : The net ionic equation will be,

$Zn(s)+2H^+(aq)\rightarrow Zn^{2+}(aq)+H_2(g)$

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The balanced ionic equation between zinc and hydrochloric acid will be,

$Zn(s)+2HCl(aq)\rightarrow ZnCl_2(aq)+H_2(g)$

The ionic equation in separated aqueous solution will be,

$Zn(s)+2H^+(aq)+2Cl^-(aq)\rightarrow Zn^{2+}(aq)+2Cl^-(aq)+H_2(g)$

In this equation, $Cl^-$ is the spectator ion.

By removing the spectator ion from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

$Zn(s)+2H^+(aq)\rightarrow Zn^{2+}(aq)+H_2(g)$

8 0

3 years ago

The camel stores the fat tristearin (C57H110O6) in its hump. As well as being a source of energy, the fat is also a source of wa

Aneli [31]

Answer:

1109 g H₂O

Explanation:

2.2 pounds can be converted to grams using a conversion ratio:

(2.2lb)(453.592g/lb) = 997.9024 g C₅₇H₁₁₀O₆

The mass in grams is converted to moles using the molecular weight of tristearin (891.48 g/mol)

(997.9024 g)(mol/891.48g) = 1.119...mol C₅₇H₁₁₀O₆

The moles of C₅₇H₁₁₀O₆ can be related to the moles of water through the molar ratio:

(1.119mol C₅₇H₁₁₀O₆)(110 H₂O/2 C₅₇H₁₁₀O₆) = 61.545 mol H₂O

The mass of water is then calculated using the molecular weight (18.02 g/mol):

(61.545 mol)(18.02 g/mol) = 1109 g H₂O

8 0

3 years ago

8) 4.00 mol HI are placed in an evacuated 5.00 L flask and then heated to 800 K. The system is allowed to reach equilibrium. Det

SVEN [57.7K]

Answer: Concentration of $H_2$ at equilibrium = 0.08 M

Concentration of $I_2$ at equilibrium =0.08 M

Concentration of $Hl$ = 0.64M

Explanation:

Moles of $HI$ = 4.00 mole

Volume of solution = 5.00 L

Initial concentration of $HI$ = $\frac{moles}{Volume}=\frac{4.00mol}{5.00L}=0.8M$

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as $K_c$

For the given chemical reaction:

$2HI(g)\rightarrow H_2(g)+I_2(g)$

Initial conc. 0.8 M 0 M 0 M

At eqm. conc. (0.8-2x) M (x) M (x) M

The expression for $K_c$ is written as:

$K_c=\frac{[H_2]^1[I_2]^1}{[HI]^2}$

$0.016=\frac{(x)\times (x)}{(0.8-2x)}$

$x=0.08M$

Concentration of $H_2$ at equilibrium = x M = 0.08 M

Concentration of $I_2$ at equilibrium = x M = 0.08 M

Concentration of $Hl$ = (0.8-2x) = $(0.8-2\times 0.08)M= 0.64M$

3 0

3 years ago

Write an equation that shows the formation of a selenide ion from a neutral selenium atom

Georgia [21]

Answer:

Se + 2e- => Se-2

Explanation:

Ions are electrically charged particles, formed due to the gain or loss of electrons by an atom.

There are two types of ions cations and anions. An element that loses their electrons and forms positive ions are cations while metals and element that gains one or more electrons and forms negative ions are anions.

Selenium is an atom with atomic number 34 and represented as Se. The electronic configuration of Se is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4. Selenium will gain 2 more electrons to complete it p orbital and form an ion Se-2.

The equation is as below:

Se + 2e- => Se-2

8 0

3 years ago