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3 years ago

HURRY NEED HELP FAST PLEASE blank have a positive charge, blank have no charge, and blank have a negative charge.

Chemistry

1 answer:

KengaRu [80]3 years ago

4 0

Answer:

Protons have a positive charge.

Neutrons have no charge.

Electrons have a negative charge.

Explanation:

I hope this helps :)

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The density of osmium, which is the densest metal, is 22.57 g/cm^3. What is the mass of a block of osmium that measures 1.00 cm

olganol [36]

Density = Mass / Volume
V = 1.00 * 4.00 * 2.50 = 10 cm³
22.57 g/cm³ = Mass / 10 cm³
M = 22.57 g/cm³ * 10 cm³
M = 225.7 g
Answer: The mass of the block of osmium is 225.7 g.

7 0

3 years ago

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What type of reaction is represented by the following? A + B ⟶ AB

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Answer:

Synthesis Reaction

Explanation:

It is a synthesis Reaction because it is taking little reactants and forming a big product!

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2 years ago

Copper, a metal known since ancient times, exists in two stable isotopic forms, 6329Cu (69.09%) and 6529Cu (30.91%). Their atomi

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Answer:

Wt. Avg. Atomic Weight => 63.35457 amu

Explanation:

Given Isotopic %Abundance fractional Wt Avg

At. Mass (amu) abundance contribution

Cu-63 62.93 69.09 0.6909 43.4783

Cu-65 64.9278 20.0668 0.200668 20.0668

Wt Average of all isotopes = ∑Wt Avg Contributions

= 43.4783 amu + 20.0668 amu = 63.35457 amu

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3 years ago

Calculate the mass in grams of 1.13 x 102 molecules of propane. The chemical formula for propane is C3H8.

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Moles = (6.74*10^23)/(6.02*10^23) =1.119 moles

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3 0

3 years ago

The The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k=0.029 W/ m measured temperature differ

vfiekz [6]

Answer:

Heat flux = 13.92 W/m2

Rate of heat transfer throug the 3m x 3m sheet = 125.28 W

The thermal resistance of the 3x3m sheet is 0.0958 K/W

Explanation:

The rate of heat transfer through a 3m x 3m sheet of insulation can be calculated as:

$q=-k*A*\frac{\Delta T}{\Delta X}\\\\q=-0.029\frac{W}{m*K}*(3m*3m)*\frac{12K}{0.025m} =125.28W$

The heat flux can be defined as the amount of heat flow by unit of area.

Using the previous calculation, we can estimate the heat flux:

$heat \, flux=\frac{q}{A}=\frac{125.28 W}{9 m^{2} } =13.92 W/m^{2}$

It can also be calculated as:

$q/A=-k*\frac{\Delta T}{\Delta X}$

The thermal resistance can be expressed as

$\Delta T=R_t*Q\\R_t=\Delta T/Q=\frac{\Delta X}{k*A}$

For the 3m x 3m sheet, the thermal resistance is

$R_t = \frac{\Delta X}{k*A}=\frac{0.025m}{0.029W/mK*9m^{2}}=0.0958 \, K/W$

4 0

4 years ago