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AVprozaik [17]
3 years ago
15

Write functions of the following parts of the digestive system.

Chemistry
1 answer:
Lapatulllka [165]3 years ago
3 0

Answer:

1. absorb water,get rid of of waste products

2.chewing

3. absorbing nutrients

4. holding the food, breakdown of food

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Una disolución contiene 50 gramos de KOH en 0.25 L de Determine la Molaridad de la disolución
snow_tiger [21]

Answer:

1. 3.56 M.

2. 0.99 M.

Explanation:

¡Hola!

1. En este caso, dado que la molaridad de una solution es calculada por medio de la siguiente ecuación:

M=\frac{n}{V}

Es posible calcular la molaridad de 50 gramos de hidróxido de potasio primero calculando las moles en dicha masa por medio de la masa molar:

n=50.0gKOH*\frac{1molKOH}{56.11gKOH}=0.891molKOH

Luego, dado el volumen de la solución, podemos calcular la molaridad:

M=\frac{0.891mol}{0.25L}=3.56M

2. En este segundo ejercicio, procedemos de la misma manera, pues primero calculamos las moles de nitrato de potasio:

n=75gKNO_3\frac{1molKNO_3}{101.1gKNO_3}=0.742mol

Luego, calculamos la molaridad justo como se hizo anteriormente:

M=\frac{0.742mol}{0.35L} \\\\M=0.99M

Best regards!

3 0
3 years ago
Metals lose electrons under certain conditions to attain a noble gas electron configuration. How many electrons must be lost by
viva [34]

Answer:

2 electrons

E. neon

Explanation:

Metals lose electrons under certain conditions to attain a noble gas electron configuration. Magnesium has 12 electrons and its electron configuration is

1s² 2s² 2p6⁶ 3s²

When magnesium loses 2 electrons, it acquires the electron configuration of neon (10 electrons).

5 0
3 years ago
If an atom contains 12 protons and 10 neutrons, what's its mass number?
MariettaO [177]
22, because you just add the protons and neutrons (12 + 10)
8 0
3 years ago
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Xenon (xe) and fluorine (f) can combine to form several different compounds, including xef2, which contains 0.2894 g fluorine fo
oee [108]

Answer is: n (number of fluorine atoms) is 6, formula of the compound is XeF₆.

m(F) = 0.8682 g; mass of fluorine.

n(F) = m(F) ÷ M(F).

n(F) = 0.8682 g ÷ 19 g/mol.

n(F) = 0.0457 mol; amount of substance.

m(Xe) = 1.00 g.

n(Xe) = 1.00 g ÷ 131.293 g/mol.

n(Xe) = 0.00761 mol.

n(Xe) : n(F) = 0.00761 mol : 0.0457 mol.

n(Xe) : n(F) = 1 mol : 6 mol.

7 0
3 years ago
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Which of the following is true regarding the speed of earthquake waves?
tankabanditka [31]
Surface waves arrive at a seismograph first because they are not impeded by rocks
7 0
3 years ago
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