Prelab Questions Experiment 1

A student measured the melting point range of an unknown solid to be 81.9 to 82.3 degrees celsius. a) Is the compound pure? b) Can you identify the compound from Table 2.2? c) If yes, what is the compound? Table 2.2: Solid - Melting Point (Celsius) Benzoic Acid - 122 Acentanilide - 114 Acetamide - 82 Biphenyl - 71 p-Dimethoxybenzene - 59 p-Dichlorobenzene - 54 Benzophenone - 48

What materials will the teacher and the students need to complete a lesson on mixing substances in a 5th grade classroom based on the below standard and learning objective? Standard Conduct an investigation to determine whether the mixing of two or more  substances results in new substances.  Learning Objective Given a variety of substances and safety equipment in a classroom setting, students will be able to conduct an experiment to mix two or more substances and observe the results. They will be able to correctly identify whether a new substance has been formed as a result of the mixing, based on observable changes such as color change, formation of a precipitate, or change in temperature, with at least 80% accuracy.

Learning Task No3: Identify the materials if it a mixture or pure substances. Give the reason for your answer. Materials Mixture or Pure substance / Why 1. Orange Juice 2. Halo-halo HALO HALO 3. Carbon 9. atom Carbon 4. Steel SUGAR 5. Sugar

What unknown solid sample has a melting point range of 78 degrees celcius to 81 degrees celcius? What is the percent error in its melting point?

A group of students performed a melting point experiment to study the physical properties of ionic and covalent solids. The data collected are shown in the table.  Solid Sample Melting Point (oC)  Time Elapsed (min) Table Sugar (sucrose) 186 18 Table Salt (sodium chloride) 500 (not observed) 30  Paraffin Wax 37 4  Vegetable Lard 50 >5 Using the information contained in the table, what is the BEST explanation for the results?A    The melting point of sodium chloride was not observed because ionic solids do not melt, whereas sugar, wax, and lard melted because they are softer than salt.B    The melting points of covalently bonded solids tend to be lower than ionic solids. The melting point of sucrose was greater than the wax or the lard because sucrose has stronger bonds than wax or lard.C    The melting point of sodium chloride was not observed because ionic solids are composed of positive and negative ions that do not melt; whereas, the…

27. Pepper and Salt mixture is a great example of a heterogeneous mixture.   Group of answer choices a)  True b)  False

In a simple set-up, a mixture is heated and the component with the lower boiling point vaporizes first, moves through the condenser, condenses chromatography filtration distillation 1 Ne Sign out

Topic: GRANULES ( I ALREADY ANSWER IT BUT I AM NOT SURE WITH MY ANSWERS, I NEED AN EXPERT TO DOUBLE CHECK MY WORK THANK YOU!!!!) 1. Granules are easier to compress than powders. II. Granules occupies greater volume per unit weight than powders. A. If both statements are TRUE B. If the FIRST statement is only TRUE C. If both statements are FALSE D. If the FIRST statement is only FALSE (MY ANSWER IS A)) 2. Granules prevent the aggregation of powders. II. Moisture and heat labile reagents are preferred in granulated preparations. A. If both statements are TRUE B. If the FIRST statement is only TRUE C. If both statements are FALSE D. If the FIRST statement is only FALSE (MY ANSWER IS C) 3. Wet granulation requires the use of 2 points roller compactors. II. Wet granulation is a prerequisite to avoid the damage of active components in the powder. A. If both statements are TRUE B. If the FIRST statement is only TRUE C. If both statements are FALSE D. If the FIRST statement is only FALSE…

Two samples have the exact same melting points. Are they the same compound? How could you tell for sure?

What unknown solid sample has a melting point range between 119 degrees celsius to 122 degrees celsius? What is the percent error of its melting point?

[answer with correct answer]   Water exists as a solid (ice), a liquid and a gas (steam). Which state of matter will water be when it is easiest to compress?

A2

A good sample of benzoic acid melts at 121-122˚C. However, a student had a sample that melted over a range of 114 to 118 ˚C. What did the student conclude about this sample?

If a liquid contains 60% sugar and 40% water throughout its composition, then what is it called? Multiple Choice solvent compound homogeneous mixture solute heterogeneous mixture

Based on the information given, identify the most significant error in the preparation of Graph 2.   Question 3 options:   A)  The title appears in a font which is too small.   B)  The best-fit line does not intersect any data point.   C)  There is wasted space on the graph.   D)  The x-axis scale divisions are uneven.

Discuss the language demands included in the lesson on mixing substances in a 5th grade classroom by Identify the language function(s) based on the below standard and learning objective. Standard Conduct an investigation to determine whether the mixing of two or more substances results in new substances. Learning Objective Given a variety of substances and safety equipment in a classroom setting, students will be able to conduct an experiment to mix two or more substances and observe the results. They will be able to correctly identify whether a new substance has been formed as a result of the mixing, based on observable changes such as color change, formation of a precipitate, or change in temperature, with at least 80% accuracy.

Pls help me I'm just grade 6 please answer the questions shortly and concise thank u experts love ❤️