Answer:
D. 27 13 Al
Explanation:
13 protons means atomic number 13. The periodic table says element 13 is aluminum (Al). 27 is the atomic mass, made up of 13 protons (1 each) and 14 neutrons (also 1 each) for a total of 27 atomic mass.
B.Birds that have different mating calls
C.Fruits flies that mate in different locations.
D.Squirrels that have different fur colors
Answer:
A. Flowers that bloom in different months
Explanation:
Nature has a way of preventive the interbreeding of closely related species and temporal isolation is one of them. When species reproduce at a different time there is little chance of hybridization (intermixing) between two related species. Since this process occurs before the mating it is also termed as pre-mating isolation.
Answer:
a.) Flowers that bloom in different months
Explanation:
Hello,
Temporal isolation is exposed when two populations are isolated by cause of when they do perform actions according to their instinct. This is considered as large a difference as mating seasons and as small a difference as what time of day they are active. Isolation makes it less likely for two populations to reproduce together, that's why flowers that bloom in different months is a clear example of this biological event.
Best regards.
b. False
Answer: Yes the statement is true.
Explanation: Endorphins are chemicals produced by the human bodies to relieve stress and pain.
They are produced mainly by brain and help to transmit electrical signals within nervous system, thus are called as neurotransmitters.
They are also called as "feel good chemicals" as they can act as pain relievers and happiness booster and thus lead to better emotional health.
Endorphins are generated in the body during exercise, which leads to better emotional health. This statement is TRUE.
Endorphins are chemicals produced by the body to relieve stress and pain. This chemical works similarly to a class of drugs called opioid. But because endorphins release naturally by the body it is a safer way to relieve stress and pain.
Exercise boosted mood and powerful depression fighter for several reasons. Through exercise, you are not only gain your physical fitness but it also gives you an enormous sense of well being. You feel more energetic, positive, sleep well and have better memory. Exercise can also serve as a distraction from negative thoughts and activities that feed depression.
Regular exercise is important to maintain a healthy body and mind. The recommended amount and intensity of physical activity varies according to ages and health condition. For an adult, the recommended time is 150 minutes per week for a moderate-intensity activity or 75 minutes per week for vigorous-intensity activity, or a combination of these two activities. You can break this into 25 minutes a day for 3 days a week.
Aerobic exercise and endorphins brainly.com/question/4349107
Endorphins brainly.com/question/890846
Regular exercise brainly.com/question/3122325
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How many moles of H2 are produced?
How many liters of H2 are produced?
0.5 moles is required for the given reaction to occur. Mole is a constant that represents a certain amount of particles such as atoms, ions, or molecules.
It is the number or constant that represents a certain amount of particles such as atoms, ions, or molecules.
1 mole = particles.
Where,
- number of moles
- given mass = 13.5 g.
- molar mass = 26.98 g/mol.
Put the values in the formula,
Therefore, 0.5 moles is required for the given reaction to occur.
Learn more about Mole concept:
Answer:
1) 0.5 mol.
2) 0.75 mol.
3) 16.8 L.
Explanation:
1) How many moles of Al react?
n = mass / molar mass,
Mass of Al = 13.5 g.
Molar mass mass of Al = 26.98 g/mol.
∴ The number of moles of Al (n) = mass / molar mass = (13.5 g) / (26.98 g/mol) = 0.5 mol.
2) How many moles of H₂ are produced?
2Al + 6HCl → 2AlCl₃ + 3H₂.
Using the cross multiplication:
2.0 moles of Al → 3.0 moles of H₂, from the stichiometry,
0.5 mole of Al → ??? moles of H₂.
∴ The number of moles of H₂ are produced = (0.5 mole)(3.0 mole) / (2.0 mole) = 0.75 mol.
3) How many liters of H₂ are produced?
It is known that at STP, 1.0 mole of any gas occupies a volume of 22.4 L.
Using cross multiplication:
1.0 mole occupies → 22.4 L.
0.75 mole occupies → ??? L.
∴The number of liters of H₂ are produced = (0.75 mole)(22.4 L) / (1.0 mole) = 16.8 L.
Answer:
n and lnQ - doubled
Q - Squared
E, Edegree - No change