Category Archives: Grade 11

Titration lab

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competency explanation

Titration is a lab technique used to determine the concentration of an unknown solution by gradually adding a solution of known concentration until a reaction occurs, often indicated by a color change. In this lab, we used titration to figure out the concentration of hydrochloric acid (HCl) by adding sodium hydroxide (NaOH). We set up a burette with NaOH and a flask with HCl and phenolphthalein. The goal was to find out how much NaOH we needed to add to completely react with the acid. The endpoint of the titration was reached when the solution turned a very faint pink that lasted for about 30 seconds. We knew we were close to the endpoint when the pink color didn’t disappear quickly. To avoid adding too much NaOH, we used half drops near the endpoint. If we added too much, the solution turned very pink. In our first test trial, we used 14.15mL of NaOH, starting with 2.56mL, we ended with a light pink shade, so we adjusted in the second trial. We used slower half drops and reached a better endpoint at 13.41 mL. In the third trial, we got 13.63mL, but the trials didnt agree within a +- 0.1 mL with each other. After adjusting, we got a better result with the right color on trial 4, 13.76mL and an average of 0.137M +- 1.7%.

core competency reflection

In this lab, I used communication and critical thinking skills. I worked closely with my partner and talked to my peers to make sure we were doing things correctly. I also asked a few questions to the teacher whenever i was unsure if our results were correct. I used critical thinking by looking at the data we collected and using it to draw conclusions. For example, after seeing the results from the first trial, and properly knowing how to do full/half drops I knew that for the second and third trials, we could pour 10.00 mL of NaOH into the HCl without worrying about the solution turning dark or having a misreading.

SJ Reflection

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Core Competency reflection

My strategies for collecting relevant information for specific tasks include…

When collecting relevant information for a specific task, it’s essential to first define clear objectives. This means understanding the purpose of the task and identifying the key questions you need to answer. Like for all of our assignments around watching a video or an article, I’m able to identify the key idea. Next, it’s important to identify reliable sources. Sources, such as books from the library, videos provided by the teacher , or original research, provide direct insight into your task. Finally, formatting your work in an organized matter. Organizing work may seem like a tedious task but it helps me organize all my work into information that is readable for myself or the teacher. Doing these strategies ensure to get amazing information for assignments.

If there is a disagreement within the group, I find it helpful to…

If there is a disagreement within the group, I find it helpful to encourage open communication and active listening. It’s important to create an environment where everyone feels heard and understood, even if our opinions aren’t all the same . I would start by asking each person to express their perspective clearly so we can fully understand their perspective. I also find it helpful to find a common ground. Finding a common ground in group work assists with projects or in class discussions, I make sure that everyone’s voices are heard in the answer. When we don’t talk much, I try to keep the conversation focused on the task at hand, or initiate the conversation. I also encourage brainstorming potential solutions together, rather than everyone having a different answer.

One goal I have for myself is to…

Focus on my critical and reflective thinking core competency . To achieve this goal I will ask others to read over my work to make sure I’m doing the correct thing. I can also reach this goal by expanding my knowledge by researching through books and online sources. If I do all these things I’ll be able to reach my goal by the end of the semester.

Ch.3 Transforming Parabolas

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Graph blue: parent function y=x^2

Graph red: opens upwards and wider y=-1/8(x-2) ^2-5

Graph green: opens down and is narrower y=-8(x+2) ^2+10

Graph black: shifted to the right of the parent function y=1/2(x-8) ^2+1

Graph purple: shifted down lower to the left y=(x+8) ^2-4

Significance of A, h, k

There are various parts of a vertex form that decide the characteristics of the parabola.

In a parabola equation, “a” dictates the direction and width of the parabola. In the graphs, altering “a” changes the curve and the shape. For instance, in my red graph, where “a” = -1/8 the parabola widens opening upwards , for the parabola to open downwards the “a” value would be negative.

Other important parts of the vertex form equation are the h value and k value.

The “h” value determines the location of the start, shifting it horizontally on the x axis, this is called a horizontal shift. The “x” value of a vertex can also be defined as the axis of symmetry, so “h” value = axis of symmetry. If “h” were negative it would shift to the left and if it were positive, it would move the parabola to the right. This is because we change the sign of the number when we plug it into the equation y=a(x-h)^2+k. Like in the green parabola, the “h” value is a +2 so the vertex moves 2 units to the right, because the 2 becomes negative. An easier way to figure it out is to make the expression equal zero, like x+2=0 that results in x=-2. The “k” value determines where on the y axis the parabola starts opening. If “k” is positive the parabola shifts up, if negative, it’s shifted down. This is called the vertical shift. The y value of the start of the parabola means the y value of the vertex. It is the minimum/maximum value of the parabola that is found at a vertical shift. It represents the minimum and maximum value of the parabola depending on whether if the graph opens up or down. In my case the black parabola, the “h” value of 8 shows a rightward placement of the parabola, placing its vertex at (8,1) Meanwhile, the purple graph shows a downward shift, which to the “k” value of -4, moving the vertex to (-8, -4). In comparison, the parent function’s k value is 0, which is why it starts opening up at 0 on a higher point.

Self-assessment

1.        How did you represent the same mathematical idea in multiple ways in this assignment?

I illustrated the mathematical concept by showing how changing the values of a, k, and h affects the position and shape of the parabola on the graph. I explained the importance of each variable in my equation and using a graphing tool (DESMOS) to visualize my function.

2.        State some of the relevant mathematical vocabulary words you used to demonstrate your understanding.

When discussing quadratic functions, I used several important mathematical terms to explain the concepts clearly.

“Horizontal shift” describes how the parabola moves left or right on the graph, based on the “h” value in the vertex form of the equation.

The “vertex” is the highest or lowest point of the parabola, which is key for deciding its maximum or minimum value.

 Lastly, a “parabola” is the U-shaped curve that is the quadratic equation, known for its symmetrical shape around the vertex.

3.        How did you use formatting to share your information in a clear and organized way.

I used a clear and structured format by adding titles to each section I discussed in this Edublog. I also added color into each heading to make them stand out and appear more organized.

Core competency goals

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Some of the things I plan to do to stay mentally and physically healthy include… creating time for myself away from anything stressful. That may be taking a walk around the neighbourhood or just having a pair of headphones and listening to my favourite music.

Some of the ways I plan to work to build and maintain relationships is by… spending quality time with my peers. During group work, I will go out of my way to make a conversation with them to create a stronger bond.

Goal 1

My goals for this year is to maintain a high gpa. This will be through having enough sleep at least 8 hours and to eat balanced meals so my brain is capable of all these new information. Another way I could do this is to spend more time preparing for my tests and to write more notes.

Goal 2

My second goal will be to ask for help whenever i need. I will ask more questions with the teachers to fully understand.