Week 1 Lab - Introduction to Science Question Set

The diagram shows the setup of an experiment. A few observations of the experiment are listed in the table below the diagram. Experimental Observations Observation Description 1 Color of solution turned blue 2 Shiny hair like crystals deposited on the copper strip Which of the following is the correct explanation for one of the given observations?  Observation 1 is a result of silver ions moving into the solution.  Observation 2 is a result of nitrate ions moving into the solution.  Observation 1 is a result of silver ions changing their oxidation state.  or Observation 2 is a result of silver ions changing their oxidation state.

Can you please answer these and give me an explanation.

1. (answer the questions in the tan boxes in the tables below each question) A student conducted an investigation to determine the effect of water temperature on the amount of sugar that dissolves in a beaker of water. Identify components for trial 1 of this investigation. Beaker Number 1 2 3 4 Amount of Water (mL) 100 100 100 100 Amount of Water (mL) Trial 1 Temperature of Temperature of Amount of Sugar Sugar (°C) Water (°C) Dissolved (g) 20 20 20 20 Temperature of Sugar 5 10 15 20 185 189 194 204 Temperature of Water Terms Variable Constant Amount of Sugar Dissolved

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1. Compare physical and chemical properties. 2. Why is it necessary to state the specific conditions by which an observation is made? 3. Suppose we have two pieces of same type of wood that are obviously different lengths. We then place both in water. It is observed that both piece floats. What makes length an extensive property?

Suppose your instructor places a can of regular and diet cola in a large container filled with water. What might you expect happen based on the results of this experiment?

1. Seawater is composed of salt, sand, and water. Is seawater a heterogenous mixture or homogenous mixture? 2. Suppose there are four unknowns in bottles: three of the bottles are solutions and one is a pure substance. How are you going to determine which of the unknown is a pure substance?

A stock solution is one that has been prepared before the experiment.   Question 1 options:   True   False

Please answer question 5 part A

answer all 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the following would supply evidence to propose a chemical change has taken place? a. The granules dissolve completely. c. The volume of the liquid increases. b. The liquid gives off heat. d. The granules become smaller. 5. Which of the following does NOT indicate a chemical change is occurring? a. formation of precipitate c. evolution of gas/bubbles b. color change d. phases of matter change

please give a  answer with explanation

Posttest Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation c. precipitation b. condensation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the…

Need all three plz

I need help with all five questions

Starting with question 2 up to question 4

MODIFIED TRUE OR FALSE Explain each underlined word why is true or false

Name the following Fe(NO3)2

1. what are the differences and similarities of "The Chemical Professional's Code of Conduct" with Good Laboratory Practices ?

This isn't a graded question... please don't reject it and solve this on your own Any help would be appreciated please

8 - 14 please

From part a : answer the question 4-8

A laboratory technician needs 1.00 L of 0.125 mol/L sulfuric acid solution for a quantitative analysis experiment. A commercial stock of 5.00 mol/L sulfuric acid solution is available from a chemical supply company. How much sulfuric acid should the lab technician take from the stocK

Epsom salt is a product that may be added to a bath to help ease sore muscles. Epsom salt crystals Epsom salt ground crystals A materials scientist tested two forms of Epsom salt under different conditions to see which would dissolve the fastest. The test information is displayed in this table. Sample Mass Form Water temperature A 50 grams ground crystals 30°C B 100 grams crystals 20°C 50 grams 100 grams ground crystals 20°C crystals 30°C Which sample of Epsom salt would you expect to dissolve the fastest? O A. A В. В ос. С O D. D

A pair of students were mixing aqueous chemical solutions in a the Classes of Chemical Reactions lab experiment. They labeled their test tubes A, B and C. Which of the test tubes showed a reaction? A B All three test tubes reacted. Test tube B reacted. Test tube C reacted. Test tubes A and B reacted. Test tube A reacted

A teacher tells students to describe physical properties of 10 mL of vinegar and 10 mL of milk. When the students finish listing the physical properties in their science notebooks, the teacher pours the vinegar and milk into the same beaker. The students are surprised to see a white solid substance form within the beaker as the two substances are combined. 13 What occurs within the beaker as the teacher mixes the vinegar and milk? A A chemical change that produces a precipitate B A physical change that creates a new substance C A physical combination that produces a solid D A corrosive reaction between two liquids 14 Before going to school, a student cuts a ripe apple into six slices and places them in a plastic bag. During lunch, the student observes that the apple slices now have brown spots. Which of the following indicates a chemical change in the apple? F Cutting the apple into six slices G Changing color of the apple H Placing the slices in a plastic bag J Removing brown spots…