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dolphi86 [110]
3 years ago
8

How many protons, neutrons, and electrons are there in an atom of potassium-39?

Chemistry
2 answers:
yanalaym [24]3 years ago
6 0
19 - Protons (as the atomic number of proton is 19)
20 - Neutrons (39 minus the amount of protons = the neutrons)
Kamila [148]3 years ago
4 0

Answer:

19 protons, 20 neutrons and 18 electrons. i think

Explanation:

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John walks 10 miles a day. How many meters does he walk in 5 days?
natima [27]

Answer:

He will burn 50 meters in 5 days

Explanation:

multiply 10 and 5.  

4 0
3 years ago
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How would using a wider cuvette affect absorbance?
IgorC [24]
The width of the cuvette is important in the spectrophotometric analysis since wider cuvette<span> translates to more absorbing species present in the path where light passes, hence more absorbance is read in the analysis. other factors include the concentration of the sample and the species itself present.</span>
8 0
3 years ago
¿recuerdas cuales son los principales sistemas que conforman nuestro cuerpo y sus funciones generales? ​
mixer [17]

Answer:

Los principales sistemas del cuerpo humano son: nervioso, endocrino, circulatorio, digestivo, excretor, respiratorio,  reproductor, muscular, esquelético, linfático, integumentario e inmunológico

Explanation:

En el cuerpo humano, las células se organizan en tejidos, los cuales a su vez forman órganos y finalmente dichos órganos forman sistemas de órganos que llevan a cabo funciones de forma conjunta.

Los principlales sistemas de órganos y sus funciones son los siguientes:

- nervioso: controla los impulsos nerviosos, controlando tanto los movimientos voluntarios del cuerpo como también las funciones cognitivas.

-endócrino: regula diferente funciones del organismo (como por ejemplo, el crecimiento) a partir de la secreción de sustancias químicas denominadas hormonas

-circulatorio: encargado de llevar nutrientes y eliminar desechos de los tejidos a través de la sangre  

-digestivo: encargado de la obtención de nutrientes a través del proceso de digestión de alimentos

-respiratorio: intercambia gases con el medio exterior, obteniendo oxígeno y eliminando dióxido de carbono

-excretor: elimina los desechos del organismo

-reproductor: encargado de perpetuar la especies mediante el mecanismo sexual de reproducción

-muscular: responsable de los movimientos voluntarios e involuntarios  

-esquelético: provee un sostén físico a las diferentes partes del cuerpo  

-inmunológico: encargado de eliminar microorganismos patógenos

-linfático: también implicado en la defensa del organismo contra microorganismos patógenos  

-integumentario: provee una capa que protege al organismo de agentes externos como, por ejemplo, los rayos solares

8 0
3 years ago
A block of wood has a mass of 180 grams it is 10.0cm long, 6.0cm wide and 4.0cm thick what is it’s volume and density
PilotLPTM [1.2K]

Answer:

<h2>Density = 0.75 g/cm³</h2>

Explanation:

Density of a substance is given by

<h3>Density(\rho) =  \frac{mass}{volume}</h3>

From the question

mass of the wood = 180 g

Since the wood is a cuboid we can find the volume using the formula

Volume = length × width × height

From the question

length = 10cm

width = 6 cm

height = 4 cm

Volume = 10 × 6 × 4 = 240 cm³

Substitute the values into the above formula and solve for the Density

That's

<h3>Density(\rho) =  \frac{180}{240}  \\  =  \frac{3}{4}</h3>

We have the final answer as

<h3>Density = 0.75 g/cm³</h3>

Hope this helps you

8 0
4 years ago
The Sun is a yellow star that's both average in brightness and temperature and is classified as
Roman55 [17]

Answer:

Classifying stars according to their spectrum is a very powerful way to begin to understand how they work.  As we said last time, the spectral sequence O, B, A, F, G, K, M is a temperature sequence, with the hottest stars being of type O (surface temperatures 30,000-40,000 K), and the coolest stars being of type M (surface temperatures around 3,000 K).  Because hot stars are blue, and cool stars are red, the temperature sequence is also a color sequence.  It is sometimes helpful, though, to classify objects according to two different properties.  Let's say we try to classify stars according to their apparent brightness, also.  We could make a plot with color on one axis, and apparent brightness on the other axis, like this:

Explanation:

7 0
3 years ago
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