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Mkey [24]
3 years ago
9

What metals and nonmetals are in a backpack

Chemistry
2 answers:
Goryan [66]3 years ago
6 0
It contains, carbon,<span> </span>silicon<span>, and </span>germanium and<span /><span> </span>tin<span> and </span>leads<span>. </span>
Lady_Fox [76]3 years ago
4 0

Answer:

Mainly Carbon, Oxygen, Hydrogen, Nitrogen, Magnesium, Aluminium, Iron and Chromium.

Explanation:

Hello,

In this case, it is widely known that backpacks have are made up of special fabrics such as Cordura, Cotton canvas, Nylon, Polyester and PVC fabrics which have the following elements in common: Carbon, Oxygen, Hydrogen and Nitrogen. which provide backpacks waterproofness,  resistance and stability.

In addition, some metals such as magnesium and aluminium as diecasts or directly stainless steel (containing iron, carbon, chromium, etc) are used to make the zippers.

Best regards.

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Determine the temperature of 1.42 mol of a gas contained in a 3.00-L container at a pressure of 123 kPa
Rashid [163]

Answer:

The temperature is 30,92K

Explanation:

We use the formula PV=nRT. We convert the unit of pressure in kPa into atm.

101,325kPa----1atm

121kPa-------x=(121,3kPax 1 atm)/101,325kPa=1, 2 atm

PV=nRT---->T= (PV)/(RT)

T=(1,2 atm x 3L)/(1,42 mol x 0,082 l atm/K mol )= 30, 91721058 K

6 0
4 years ago
When the pH of a solution is changed from 4 to 3,
Ivenika [448]
The correct answer is option 2. When the pH of a solution is changed from 4 to 3, the hydronium ions increases by a factor of 10.  pH is a scale used to measure the acidity or alkalinity of an aqueous solution. It can be used to calculate the amount of hydronium ions in the solution. It is expressed as: pH = -log [H+].

 

7 0
3 years ago
Two waves were analyzed with some high-tech instrumentation. The first wave was found to have a wavelength of 3 x 10 m and the s
a_sh-v [17]

Explanation:

The first wave was found to have a wavelength of 3 x 10⁵ m and the second wave had a wavelength of 3 x 10⁴ m

We need to find which wave have a higher frequency.

The relation between frequency and wavelength is given by :

c=f\lambda

Let f₁ and f₂ be the frequency of wave 1 and wave 2.

f_1=\dfrac{c}{\lambda_1}\\\\f_1=\dfrac{3\times 10^8}{3\times 10^5}\\\\=1000\ Hz

And

f_2=\dfrac{c}{\lambda_2}\\\\f_2=\dfrac{3\times 10^8}{3\times 10^4}\\\\=10000\ Hz

Hence, the wave having less wavelength will have higher frequency. The wave having wavelength 3 x 10⁴ m will have higher frequency.

8 0
3 years ago
How much heat, in joules and in calories, must be added to a 75.0–g iron block with a specific heat of 0.449 j/g °c to increas
lianna [129]

Answer:

Q=50,849.25J\\\\Q=12,153.3cal

Explanation:

Hello!

In this case, given the mass, temperature change and specific heat, it is possible to compute the required heat in joules as shown below:

Q=mC(T_2-T_1)\\\\Q=75.0g*0.449\frac{J}{g\°C}(1535\°C-25\°C)\\\\Q=50,849.25J

Now, since 1 cal =4.184 J, this result in calories is:

Q=50,849.25J*\frac{1cal}{4.184J}\\\\Q=12,153.3cal

Best regards!

7 0
3 years ago
A 145.2 L sample of gas exerts 315.7 mm Hg pressure at 89.8 °C. What volume does the gas have at 706 mm
jenyasd209 [6]

Answer:

c

Explanation:

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