Lianett Hechavarria

Nova Southeastern University
Teacher

Biography

I am a high school Math and Chemistry teacher with more than 10 years of experience in the classroom. I have a Bachelor's in Nuclear Chemistry and a Master in Education, but Math has been my passion since childhood. I also teach Chemistry at Miami Dade College.
I love helping students to thrive and appreciate their hard work.

Education

MS Science Education
Nova Southeastern University

Educator Statistics

Numerade tutor for 4 years
34 Students Helped

Topics Covered

The Power of Algebraic Language: Unlocking Mathematical Potential
Mastering Equations and Inequalities: Your Guide to Mathematical Success
Understanding Complex Numbers: A Comprehensive Guide

Lianett's Textbook Answer Videos

1

Lianett's Quick Ask Videos

03:27
Chemistry 101

The percent composition of alpha-tocopherol acetate is C (78.76%), H (11.09%), and the molar mass was found to be 472.73 g/mol. What is the molecular formula of alpha-tocopherol acetate given that it only contains carbon, hydrogen, and oxygen? Hint: Skip the process of finding the empirical formula since the values are messy. Instead, find the molecular formula directly from the molar mass and the percentages. CxHyOz

Lianett Hechavarria
15:53
Chemistry 101

1) How many grams of calcium hydroxide must react to give 3.09 g of Ca3(PO4)2? Na3PO4(aq) + Ca(OH)2(aq) → Ca3(PO4)2(s) + NaOH(aq). Express your answer with the appropriate units.
2) How many grams of sodium hydrogen carbonate decompose to give 17.7 mL of carbon dioxide gas at STP? 2NaHCO3(s) → Na2CO3(s) + H2O(l) + CO2(g). Express your answer with the appropriate units.
3) How many grams of iron(III) carbonate decompose to give 43.6 mL of carbon dioxide gas at STP? Fe2(CO3)3 → Fe2O3(s) + 3CO2(g). Express your answer with the appropriate units.
4) How many milliliters of oxygen gas at STP are released from heating 2.05 g of mercuric oxide? 2HgO(s) → 2Hg(l) + O2(g). Express your answer with the appropriate units.

Lianett Hechavarria
02:14
Chemistry 101

The curie is a unit used to measure the radioactivity of a substance. It is defined as one Ci = 3.7×10^10 decays per second. Given that 1 Ci = 1000 mCi, how many decays per second would you expect a radioactive sample that contains 500 mCi to emit?

Lianett Hechavarria
02:06
Algebra

Write equations of the lines through the given point parallel to and perpendicular to the given line.
x + y = 5, (-4, 3)
(a) parallel to the given line
(b) perpendicular to the given line

Lianett Hechavarria
08:53
Chemistry 101

141 mL of 1.2 M aluminum nitrate is mixed with 85 mL of 0.27 M sodium carbonate.

a. Write a balanced equation for the reaction.
b. Write the total ionic equation for the reaction.
c. Give the name of any precipitate that has formed.
d. Write the net ionic equation for the reaction.
e. Find the number of moles of precipitate that has formed.
f. Find the mass of precipitate that has formed.

Lianett Hechavarria
02:56
Biology

Match the plant and bacterial organelles/structures to their jobs/functions.

A. cell wall
B. central vacuole
C. chloroplast
D. pili

A. support and protection
B. holds water that presses on outer cell to keep cell plump and stores nutrients, wastes, and helps maintain pH
C. contains pigments and enzymes that make sugar from water and carbon dioxide using light energy (photosynthesis)
D. anchor/stick cell to surfaces and can be used to transfer DNA from one cell to another for reproduction

Which of the following is FALSE about cells?

A. Cells are the smallest LIVING thing.
B. Cells are made of organelles.
C. The endosymbiotic theory states that mitochondria and chloroplasts used to be free-living bacteria that moved into a eukaryotic cell and because they both benefited, the bacteria evolved into organelles instead of bacteria.
D. Most cells in a human are constantly moving around the body and they usually live as long as the human they are in.
E. One cell can be an entire organism.

Lianett Hechavarria
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