Tutor profile: Amanda M.
Conjugate these sentences using a specific verb form, identify the verb form, and explain why you used it: 1) Today she walked to the park. 2) When I was a kid, I walked to the park frequently. 3) You (tu form) walk to the park every day.
1) Hoy ella caminó al parque. (Preterite "ella"/"she" form - one time, temporary action) 2) Cuando era niño, yo caminaba al parque frequentemente. (Imperfect "yo"/"I" form - continuous/repeated action in the past) 3) Tú caminas al parque todos los días. (Present "tú"/"you" form - repeated action in the present)
Subject: Basic Math
In the following expression, describe how you would isolate the variable "x", and explain your reasoning for each step. 4x-12+2x=24
1) Combine "like terms" (meaning all terms that include "x"; 4x and 2x) to get 6x-12=24 2) Since 12 is being subtracted on the left side of the "=", and addition is the opposite function of subtraction, add 12 to both sides of the "=" to move the 12 to the left side, which gets us closer to having "x" alone on the left side of the equation. This yields: 6x-12+12=24+12 AKA 6x=36 3) Since x is being multiplied by 6, and the opposite function of multiplication is division, divide both sides of the "=" by 6 to isolate "x". (6x/6)=(36/6) 4) After this division is carried out, we will have x=6
What chemical properties of water and oil prevent them from combining? Why is it that if you add soap, they will then combine?
Water is a polar compound, due to a difference in electronegativity between oxygen and hydrogen (which make up water molecules). Oil is a nonpolar compound, due to equal electronegativity between carbon and hydrogen (which usually make up oil molecules). Polar compounds cannot bond with nonpolar compounds, therefore they cannot mix. Soap molecules, on the other hand, have one polar end and one nonpolar end. The nonpolar end can bond with the oil molecules, and the polar end can bond with the water molecules, which allows indirect bonding between oil and water and allows them to mix.
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