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Anika [276]
3 years ago
15

Identify each element below, and give the symbols of the other elements in its group:

Chemistry
1 answer:
nikdorinn [45]3 years ago
3 0

Answer:

In explanation

Explanation:

a. Selenium, atomic number 34

Argon is 18, adding the other electrons gives 34.

Other elements include: oxygen O , Sulphur S , Tellurium Te and Polonium Po

b. Hafnium, element 72

Xe is 54, adding the other electrons makes the total 72.

Other elements; Titanium Ti, Zirconium Zr, Rutherfordium Rf

c. Manganese, element 25

Other group members are Technetium Tc , Rhenium Re and Bohrium Bo

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A molecule of nitrogen gas consists of two nitrogen atoms joined together. Write the formula of nitrogen gas.
Xelga [282]
<span>The formula for nitrogen gas is N2<span>

your welcome!</span></span>
4 0
3 years ago
In the 1800s two scientists, Theodor Schwann and Matthias Schleiden, studied different types
juin [17]

The correct answer is C. Living things are composed of cells.

Explanation:

A conclusion is an idea derived from information, this idea or statement often summarizes the information or indicates the result of this. In the case of the studies by Schwann and Schleiden, these two focused on living organisms. Moreover, in both studies, the researchers found different living organisms were composed of basic life units known as cells.

In this context, one idea that derives from the findings of the two studies is "Living things are composed of cells". Also, this conclusion is now part of modern cell theory because the basic unit of life is the cell and cells can be found in all living organisms despite the type of organism (animal, plant, fungi,etc.)

6 0
3 years ago
Calculate the molarity of a solution that contains 183.51 grams of lead (II) bromide in 500.0 mL of the solution
nadya68 [22]

Answer: 1M

Explanation:

Molarity = mols/L

moles of lead bromide: 183.51/ 367.0 = 0.5 mol

500 ml/ 1000 mL = .5L

.5 mol / .5 L = 1 mol/L = 1M

5 0
3 years ago
The phase(s) of matter that demonstrate fluidity include:
melomori [17]

Liquid and Gas are the phases of matter that demonstrate fluidity.

Explanation:

The phenomenon of easy flow or easy transfer or movement of particles is termed as fluidity. As it is known that matters are basically classified into three types or phases. They are solid, liquid and gases. The solid particles are tightly bonded. In other words, high energy is required to move the atoms in the solid material. But in liquid the atoms are slightly loosely bonded. So they are flow easily. With only the viscous tendency hindering its flow, the liquid phased materials can be termed as fluid. Similarly, the easiest travelling particles are gas particles and so they also have fluidity and they are also termed as fluid. So the phases which are termed under fluid criteria demonstrating fluidity included liquid and gas phase

3 0
3 years ago
Para formar bronce, se mezclan 150g de cobre a 1100°C y 35g de estaño a 560°C. Determine la temperatura final del sistema.
BabaBlast [244]

Answer:

T_F=1029\ºC

Explanation:

¡Hola!

En este caso, dada la información, es posible determinar que la temperatura del sistema estará entre 560 °C y 1100 °C, por lo tanto, se hará necesario establecer la suma de la energía del cobre y del estaño como cero:

Q_{Cu}+Q_{Sn}=0

Así, podremos escribir esta ecuación en términos de masas, calores específicos y temperaturas como sigue:

m_{Cu}C_{Cu}(T_F-T_{Cu})+m_{Sn}C_{Sn}(T_F-T_{Sn})=0

Con el fin de resolver para la temperature final:

T_F=\frac{m_{Cu}C_{Cu}T_{Cu}+m_{Sn}C_{Sn}T_{Sn}}{m_{Cu}C_{Cu}+m_{Sn}C_{Sn}}

Así, reemplazamos las variables conocidas como se muestra a continuación:

T_F=\frac{150g*0.093cal/g\ºC*1100\°C+35g*0.060cal/g\ºC*560\°C}{150g*0.093cal/g\ºC+35g*0.060cal/g\ºC}\\\\T_F=1029\ºC

¡Saludos!

3 0
2 years ago
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