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umka2103 [35]
3 years ago
6

BRAINLIESTTTT ASAP!!! please explain your answers. :)

Biology
2 answers:
QveST [7]3 years ago
6 0
The two are potassium and rubidium. Why? Na is an alkali metal. As you go down the metals become more reactive. 
Calcium has 20 protons. Why? The atomic # is 20 (the one at the top).
It has 20 neutrons. Why? The atomic mass (the number on the bottom) is ~40, ignoring electron mass. 40- 20 protons = 20 neutrons. 
It has 20 electrons. 
Why? The # of protons and electrons is the same. Ions aren't on the periodic table.
Please mark brainliest if I helped you!
exis [7]3 years ago
4 0
Answer: POTASSIUM and RUBIDIUM 
Potassium and Rubidium are both Alkali Metals, as such is Sodium. They are alike in many ways, as is why they are categorized in the same group (Alkali Metals). <span>
The properties of Alkali Metals are as follows:
</span>they have low melting and boiling points compared to most other metals.they are very soft and can be cut easily with a knife.<span>they have low densities (lithium, sodium and potassium will float on water)
</span>
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You start off with 100 E. coli cells known to divide every 20 minutes. Based on this information and using formulas for exponent
tensa zangetsu [6.8K]

Answer:

21 minutes or 0.35 hours

Explanation:

The formula for exponential population growth is

A = A_0* e^{kt}\\

where

A_0 = initial population of E.coli i.e 100

k is the rate of population growth i.e 2 as the population doubles

t is the time period i.e 20 minutes

Substituting the given values in above equation, we get -

A = 100 * e^{2 * \frac{20}{60} }\\\\A = 195

Generation time

G = \frac{t}{3.3 * log \frac{194}{100} } \\G = \frac{t}{0.949} \\G= 21 minutes

or 0.35 hours

6 0
3 years ago
A client reports sharp and stabbing chest pain that worsens with deep breathing and coughing. A cardiac cause to this pain is ru
d1i1m1o1n [39]

Answer:

Pleurisy

Explanation:

Pleurisy is a medical condition caused by the inflammation of the pleura membranes. The pleural membranes are vital part of the respiratory system. These membranes which surround the lungs and lines the inner chest wall, help to give cushion and reduce friction in the lungs. When the pleural membranes become inflamed, the surfaces become tough and sticky, thereby causing the sharp pain the person feels in the chest while breathing.

7 0
3 years ago
3. deference between diffusion and osmosis​
pashok25 [27]
Osmosis only talks about water molecules

Diffusion talks everything other then the water molecules.

So,
Osmosis : water molecules travel from a region of a higher water potential to a region of lower water potential through a partially permeable membrane via osmosis

Diffusion : Travels from a region of higher concentration to a region of lower concentration through a partially permeable membrane via diffusion
3 0
3 years ago
You arrive at the scene of a Motor Vehicle Accident. You find three patients, a 16 year old boy with a broken arm, a seventeen y
Rzqust [24]
Yes you need to call another ambulance because you need to take care of someone with a broken arm , head injury (also unconscious) you would need another ambulance to check on the pregnant woman and man with cuts and scratches.
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3 years ago
How is wind energy different from energy from fossil feels?
amm1812

first of all, wind energy is a renewable source of energy and fossil fuels is a non renewable

the method of obtaining them is also different i.e , wind energy can be obtained when wind turns turbines , and fossil fuels are burned to give energy...

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3 years ago
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