An atom of titanium with atomic number 22 and mass number 49 contains 22 protons, 27 neutrons, and 22 electrons.
An atom of titanium has an atomic number of 22 and a mass number of 49. The atomic number represents the number of protons in an atom, so there are 22 protons in this titanium atom. The mass number of an atom is the sum of its protons and neutrons.
Since the atomic mass is 49, and the atomic number is 22, we can subtract the atomic number from the atomic mass to find the number of neutrons. In this case, there are 27 neutrons in the titanium atom. If the titanium atom is neutral, it means it has an equal number of protons and electrons. Since there are 22 protons, there are also 22 electrons in the atom.
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B. Small lenses cause more distortion in images than big lenses.
C. Small telescopes gather more radiation from space than big telescopes.
D. Small telescopes produce clearer images of distant objects than big telescopes.
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Answer:A
Explanation:Test
Answer:
The pressure inside the wine bottle at 21 °C is 4.8 · 10² atm
Explanation:
Hi there!
We know that 1 mol of CO₂ is produced per mol of produced ethanol.
If the final concentration of ethanol is 13%, let´s calculate how many moles of ethanol are present at that concentration.
A concentration of 13% means that in 100 ml of solution, 13 ml is dissolved ethanol. We have 754 ml of solution, then, the volume of ethanol will be:
754 ml solution · (13 ml ethanol/100 ml solution) = 98 ml ethanol
With the density, we can calculate the mass of ethanol present:
density = mass/ volume
0.79 g/ml = mass / 98 ml
mass = 0.79 g/ml · 98 ml
mass = 77 g
The molar mass of ethanol is 46.07 g/mol, then 77 g of ethanol is equal to:
77 g · (1 mol/46.07 g) = 1.7 mol
Then, the number of moles of CO₂ produced will be 1.7 mol.
Using the equation of the ideal gas law, we can calculate the pressure of CO₂:
P = nRT/V
Where:
P = pressure
n = number of moles
R = ideal gas constant
T = temperature
V = volume
The volume will be the headspace of the bottle (840 ml - 754 ml) 86 ml = 0.086 l.
The temperature in kelvin will be: 21 + 273 = 294 K
The gas constant is 0.082 l atm / K mol
Then:
P = (1.7 mol · 0.082 l atm/K mol · 294 K)/ 0.086 l
P = 4.8 · 10² atm
The pressure inside the wine bottle at 21 °C is 4.8 · 10² atm
b. no ability to produce rain.
c. particles made of ice crystals.
d. its base at or near the ground
Answer: d. Its base at or near the ground.
Explanation:
Fog is a visible weather condition in which the tiny droplets of water present in the atmosphere come together and which forms a thick cloud which lies close to the surface of the ground (land) or above the sea surface. Fog cuts the visibility down to one kilometers, it makes it difficult to observe the things through it. The fog is influenced by several factors such as wind conditions, nearby water bodies, and topography.
Fog is a cloud that has its base at or near the ground. The answer is letter D. Fog results when atmospheric water vapor condenses to the extent that the new forms, water droplets or ice crystals, become visible. Saturation of the air and sufficient condensation nuclei are ordinarily prerequisites for the formation of fog. One of the great hazards associated with fog is a lack of visibility.
B. Elements produce continuous spectra.
C. Elements produce spectra with only a few distinct lines.
Atomic emission spectra are unique to each element and consist of distinct lines representing different energy levels.
The correct statement regarding atomic emission spectra is option C: Elements produce spectra with only a few distinct lines.
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