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Answer: Rougher surfaces have more friction between them than smoother surfaces. That's why we put sand on icy sidewalks and roads. You can't slide as far across ice with shoes as you can on the blades of skates. The rougher surface of the soles of the shoes causes more friction and slows you down.<em> There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest.</em>
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A mole of any gas occupied 22.4 L at STP. So, the number of moles of nitrogen gas at STP in 846 L would be 846/22.4 = 37.8 moles of nitrogen gas.
Alternatively, you can go the long route and use the ideal gas law to solve for the number of moles of nitrogen given STP conditions (273 K and 1.00 atm). From PV = nRT, we can get n = PV/RT. Plugging in our values, and using 0.08206 L•atm/K•mol as our gas constant, R, we get n = (1.00)(846)/(0.08206)(273) = 37.8 moles, which confirms our answer.
We use the term formula unit for ionic compounds because ;
- Ionic compounds consist of cations and anions present in constant ratio ( C )
- Ionic compounds consist of continuous arrays of cations and anions ( D )
The molecule of an ionic compound gets attached to another molecule of an ionic compound via electrostatic force of attraction. this form of attraction between the molecules forms an arranged lattice structure. and due to this well arranged lattice structure an ionic compound can be termed as a Formula unit and not molecule.
Hence the correct options are as listed above
Learn more : brainly.com/question/14870624
