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MArishka [77]
2 years ago
15

Which two statements about composite materials are true? They’re made up of more than one substance. They have the same or simil

ar properties as the materials used to make them. They’re always made of metal. They’re readily available in nature.
Chemistry
2 answers:
attashe74 [19]2 years ago
8 0

True

-They’re made up of more than one substance.

-They have the same or similar properties as the materials used to make them.


SashulF [63]2 years ago
5 0

Answer:

They’re made up of more than one substance.

They have the same or similar properties as the materials used to make them.

Explanation:

They’re made up of more than one substance. True.

For example concrete is made up of a loose stones embedded in a matrix of cement.

They have the same or similar properties as the materials used to make them.True.

Concrete is robust and  can withstand high compression forces.

They’re always made of metal. False.

Concrete is not made up of a metal.

They’re readily available in nature. False.

Concrete is a man made substance. All composite materials are made by engineers they do not occur naturally in nature.

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A mass spectrometer has determined the mass and abundances of all isotopes of an unknown element. The first isotope has a mass o
shepuryov [24]

Answer:

I believe it is Potassium (K)

Explanation:

I did the math on a calculator and it was the closest atomic mass to potassium.

5 0
2 years ago
Consider the balanced equation below. 4NH3 + 3O2 --> 2N2 + 6H2O What is the mole ratio of NH3 to N2?
AURORKA [14]
The balanced equation given is:
4NH3 + 3O2 .....> 2N2 + 6H2O

From this equation, we can note that 4 moles of NH3 are required to produce 2 moles of N2.

Therefore, the mole ratio of NH3 to N2 is 4:2 which can be simplified into 2:1
4 0
2 years ago
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How many SO32- ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.
DochEvi [55]
99.6 mg= .0996 g
.0996g x (1mol/125.05g) x (1 mol SO3/1 mol Na2SO2) x (6.02 x 10^22/1mol SO3) = 4.79 x 10^19 SO32- ions
6 0
2 years ago
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Two electrons in an atom are separated by 1.5 ✕ 10-10 m, the typical size of an atom. what is the electric force between them?
densk [106]
Given two electrons with charge of 1.5x10^-10 m 

The electostatic force between them is determined by this formula: 

F = kq1q2/r^2
   
where 

k = 9x10^9
q1 = q2 = 1.5x10^-10
r = 2.82x10^-15

F = 9x10^9 * (1.5x10^-10)^2 / 2.82x10^-15
   = 71808.51
4 0
2 years ago
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The concentration of Si in an Fe-Si alloy is 0.25 wt%. What is the concentration in kilograms of Si per cubic meter of alloy?
kodGreya [7K]

Answer : The concentration of Si in kilograms is, 19.55kg/m^3

Explanation :

As we are given that, the concentration of Si in an Fe-Si alloy is 0.25 wt% that means:

Weight of Si = 0.25 g = 0.00025 kg

Weight of Fe = 100 - 0.25 = 99.75 g = 0.09975 kg

Density of Si = 2.32g/cm^3=2.32\times 10^6g/m^3

Density of Fe = 7.87g/cm^3=7.87\times 10^6g/m^3

Now we have to calculate the concentration in kilograms of Si per cubic meter of alloy.

Concentration of Si in kilograms =  \frac{\text{Weight of Si in 100 g of alloy}}{\text{Volume of 100 g of alloy}}

Concentration of Si in kilograms =  \frac{\text{Weight of Si in 100 g of alloy}}{\frac{\text{Wight of Fe}}{\text{Density of Fe}}+\frac{\text{Wight of Si}}{\text{Density of Si}}}

Now put all the given values in this expression, we get:

Concentration of Si in kilograms = \frac{0.00025kg}{\frac{99.75g}{7.87\times 10^6g/m^3}+\frac{0.25g}{2.23\times 10^6g/m^3}}

Concentration of Si in kilograms = 19.55kg/m^3

Thus, the concentration of Si in kilograms is, 19.55kg/m^3

5 0
2 years ago
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