A polar molecule is when the arrangement of the atoms in molecules are unequal where one end of the molecule has a positive charge while the other end has a negative charge. Examples of a polar molecule are water, ammonia, hydrogen sulfide and sulfur dioxide. The opposite is called a nonpolar molecule. These molecules would share their electrons equally resulting to having no partial charges in the molecule. Examples of this are most of the organic compounds like benzene and hexane, carbon tetrachloride is also a nonpolar molecule. To identify, you need to look at the structure and the electronegativities of the atoms.
With a mole of skittles placed side by side, you can go around the earth <span>191.17 trillion times.
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</span>(6.022x10^23) x .5" = 3.011x10^23 inches.
<span>3.011x10^23 / 12 in per ft(=.251)
</span><span>.251 /5280 ft per mile = 4.75x10^18 miles
</span><span>4.75x10^18 miles / 24850 mile around the earth = 1.9117x10^14 time around the earth.
</span><span>191.17 trillion times around the earth</span>
Answer is: step 3 would be placed C.
This is example of chemical change (chemical reaction), because new substances are formed (gas is emitted), the atoms are rearranged.
Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the psysical change, just with different form or state of matter.
Chemical reaction: powder + water → new substance + gas.
Answer:
gravitational energy
Explanation:
It is gravitational (potential) energy because of the place that the rock holds in the gravitational field. It has <u>potential</u> to move downward, because of <u>gravity</u>.
Answer:
Option D is correct. MgO has a higher melting point because the ions have larger charges.
Explanation:
Magnesium oxide contains higher melting point compare to sodium chloride, because of its Mg2+, and O2- ions contain greater number of charges, and helping to form strong ionic bonds compare to Na+, and Cl- ions in Nacl.
That's why melting point of magnesium oxide is more than sodium chloride. MgO molecules bounded with each other with very high force known as electrostatic attraction present between negatively charge oxygen, and positively charge magnesium ions.