The exercise is to measure and record the Physical properties of materials, such as flexibility, magnetism, thermal conductivity, electrical conductivity and density. Magnetism and flexibility can be observed directly, while density, thermal conductivity, and electrical conductivity require calculations.
The student is asked to measure and record the physical properties of various materials.
Flexibility can be rated subjectively on a scale of 1-10, with 10 being most flexible.
Magnetism can be tested by seeing how many paper clips each material can hold.
Thermal Conductivity (W/(m·K)) is a measure of a material's ability to conduct heat, while Electrical Conductivity (x107 S/m) measures the material's ability to conduct electricity.
For density, you need the mass (M) and volume (V) of the material.
The mass is given as 10g for all materials. You have to measure the volume (V) using the formula length x width x height (L x W x H).
Then plug M and V into the density formula D=M/V to get the density in g/cm3. Keep in mind that each material will have different properties.
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solution of NaNO?
Answer:
1.25 moles NaNO
Explanation:
Molarity = moles/Volume (L)
moles = Molarity (M) x Volume (L)
M = 2.5 M
V = 500 mL = 0.5L
moles = M x V = 2.5 x 0.5 = 1.25 moles
Answer:
2.2 °C/m
Explanation:
It seems the question is incomplete. However, this problem has been found in a web search, with values as follow:
" A certain substance X melts at a temperature of -9.9 °C. But if a 350 g sample of X is prepared with 31.8 g of urea (CH₄N₂O) dissolved in it, the sample is found to have a melting point of -13.2°C instead. Calculate the molal freezing point depression constant of X. Round your answer to 2 significant digits. "
So we use the formula for freezing point depression:
In this case, ΔTf = 13.2 - 9.9 = 3.3°C
m is the molality (moles solute/kg solvent)
Molality = 0.53 / 0.35 = 1.51 m
So now we have all the required data to solve for Kf:
Answer:
The correct option is: D. A small lever in a relay switch
Explanation:
Armature is a constituting part of an electric machine, that can be used as a stationary or rotating part. It is a conductor or a conducting coil that carries alternating current and can generate electromotive force.
In a solenoid, the movable steel or iron part that functions as a switch or relay is also termed as the armature.