Properties of Water Lab Questions
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Water's surface tension is caused by the attraction of water molecules to each other through hydrogen bonding. This allows paperclips and other objects to float, but soap disrupts this bonding causing objects to sink. Alcohol droplets have less surface tension than water droplets as the molecules are not as strongly bonded. A meniscus is the curved surface of liquid in a narrow container. Glass shows a larger meniscus than plastic because water molecules are more strongly attracted to the glass surface. Graduated cylinders account for the meniscus in measurements. Liquid level should be read from the bottom of the meniscus. Capillary action is caused by two properties - adhesion of water to surfaces and cohesion of water
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More from TeacherAndrew
An Introduction to Water
Water is essential for life on Earth. It covers 71% of the planet's surface, with 96.5% found in oceans. Only 2.5% is freshwater, mostly stored as groundwater or ice. The water cycle describes the continuous movement of water on, above, and below the surface of the Earth. It involves evaporation, vapor rising and condensing into clouds, then falling as precipitation to nourish both land and water.
Studying and Policies
The document outlines the grading breakdown and policies for a semester 2 class. The notebook is worth 40% of the grade, with midterms and finals each worth 20% and projects ranging from 5-10%. Behavior accounts for 10-15% of the grade. The instructor will not chase students for late or missing work; it is the student's responsibility to get any work from missed classes. Work more than 2 weeks late will not be accepted. To do well, students should take good notes worth 40% of the grade, avoid disrupting class, turn work in on time, and study for tests.
Final Exam Help
The document provides information and advice for studying for an upcoming final exam in Foundation Science. It emphasizes several key points:
- Practice unit conversions and show your work, as these will be tested on the exam.
- Concentrate most on studying the properties of water, as this subject will be most heavily covered on the test compared to other topics.
- Be able to graph and understand how the density of water changes with temperature.
- There is extra credit available online but it must be completed before the final exam date of February 28th, though late submissions may be accepted. There will be no retests allowed for the final exam grade.
Rocks
The document is a lesson on rocks that discusses the three main types of rocks - igneous, sedimentary, and metamorphic. It explains that igneous rocks form from the cooling of magma or lava, sedimentary rocks form from compressed sediments, and metamorphic rocks form from intense heat and pressure changing other rock types. The rock cycle is also described, showing how rocks can change between the three types over time.
Properties of Water Pre-lesson
Water has unique properties including polarity, hydrogen bonding, and high specific heat capacity that arise from its molecular structure and allow it to perform important functions. Adhesion and cohesion are the attraction of water molecules to other surfaces and themselves, respectively, while polarity results from water's bent molecular shape with partially positive and negative ends. Hydrogen bonding between water molecules contributes to cohesion and many other properties crucial for life, such as capillary action and heat regulation in the human body.
Rocks Pre-lesson
A student is asked a series of questions about rocks and minerals, including the three main types of rocks, the difference between rocks and minerals, the rock cycle, the most common rock seen on Earth's surface, properties of granite and obsidian, and the meaning of the term "metamorphic".
Extra Credit Points (See class website for extra credit assignment; due befor...
Go to class website for copy.com extra credit assignment:
https://sites.google.com/site/2555teacherandrew/
Converting Units
This document provides instructions on how to convert between different units of measurement using conversion factors. It explains that you need to find a conversion factor that relates the initial and target units, then use that factor to perform the calculation. Two examples are shown converting feet to meters and cubic centimeters to liters. The document concludes with practice problems converting seconds to days and age in years to minutes.
Unit Conversion Worksheet
The document is a unit conversion worksheet that provides conversion factors for common units of measurement and asks students to perform unit conversions for various quantities, showing their work and crossing out cancelled units. It includes conversions between seconds and days, pounds and kilograms, inches and miles, and rates such as miles per hour, feet per second, pounds per week, and gallons per month.
Summative Help
The midterm exam for Foundation Science SC 22101 will cover elements and compounds, valence electrons, and radioactive elements. The class website at www.sites.google.com/site/2555teacherandrew/ is recommended for studying and contains downloadable class presentations from slideshare. Students should print the powerpoint presentations as handouts for a good way to print the lecture notes.
Radioactive Post Lesson Test Practice
This document instructs the reader to draw pictures of three types of radiation: alpha, beta, and gamma. It also specifies that the drawings should label protons, neutrons, and electrons.
Radioactive Elements
Radioactive elements undergo radioactive decay, where the nucleus of an atom gives off energy or particles. There are three main types of radioactive decay:
1) Alpha decay emits protons and neutrons.
2) Beta decay emits electrons.
3) Gamma decay emits electromagnetic waves.
Gamma decay can only be stopped by thick metals like lead, while alpha and beta decay can be stopped by thinner materials. Radioactive elements tend to be unstable and have high atomic numbers above 83. Isotopes are variants of the same element with different numbers of neutrons, and some isotopes are radioactive.
Groups coloring worksheet
1. Hydrogen has one valence electron and is not an alkali metal.
2. The alkali metals have one valence electron.
3. The transition metals are harder than the alkali metals.
Pre radioactive lesson computer room questions
This document contains 10 questions about radioactivity and nuclear physics concepts to be answered in a notebook. The questions cover definitions of radioactivity, alpha decay, beta decay, and gamma decay; symbols used to represent each type of decay; which type of radiation is hardest to stop; and what units are used to measure radiation levels. The final two questions ask about the radioactivity of hydrogen and its isotopes.
Group Names and Properties
Groups are columns on the periodic table that contain elements with the same number of valence electrons. The document discusses several important groups including hydrogen, alkali metals, alkaline earth metals, transition metals, boron family, carbon family, nitrogen family, oxygen family, halogens, and noble gases. It provides key details about the location of each group on the periodic table and chemical properties common to the elements within each group.
Valence Electrons Worksheet
This document is a worksheet about valence electrons that contains questions asking students to:
1) Identify the number of electrons in various elements.
2) Draw Lewis structures and identify the number of outer shell electrons for different elements.
3) Identify the number of valence electrons elements have by filling in their electron configurations.
Element Project
The document provides instructions for a school project where students are assigned an element from the periodic table to research and create an informational card about. The card must be a specific size and include details like the element name, atomic number, properties, and interesting facts. Students are directed to draw or paste pictures related to their element's uses and applications. All cards will be displayed together on the classroom wall to form a giant periodic table by the due date.
Valence Electrons
Valence electrons are the outermost shell electrons of an atom that are involved in bonding. Elements in the same group on the periodic table have the same number of valence electrons because they exhibit similar chemical properties based on their valence electron configuration. Atoms seek to attain a full outer shell of 8 electrons to achieve stability through gaining, losing or sharing valence electrons in chemical bonds.
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The History of Stoke Newington Street Names
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Properties of Water Lab Questions
- 1. Surface Tension Questions 1. 2. 3. You saw a paperclip (or copper) float on top of the water. This is caused by water’s surface tension. What causes water’s surface tension? EXPLAIN! What happened in the water with soap? Did the paperclip still float? Why or why not? Put a drop of water next to a drop of alcohol. Do you see a difference? Explain! Why is there a difference between the two drops?
- 2. Meniscus Questions 1. 2. 3. 4. What is a meniscus? You see that a graduated cylinder made of glass has a large meniscus, while a graduated cylinder made of plastic has a small one. Guess as to why this may be. Do graduated cylinders account for a meniscus? Where should you read from a graduated cylinder: from the top of the meniscus, or the very bottom?
- 3. Capillary Action Questions 1. 2. 3. 4. 5. 6. What 2 properties of water cause capillary action? Why is capillary action such a good “deal” for plants? Plants use capillary action to get water from the ground to their ___________ where photosynthesis takes place. Do you think the human body uses capillary action? During capillary action, the water in _____________ tubes is able to flow higher than the water in wide tubes. If water was not attracted to the sides of a tube, would capillary action occur?