Chemistry, 14.12.2020 07:20 CheddaDsk

Reactions in Our World Lab Report Instructions: In this laboratory activity, you will be comparing chemical reactions to nuclear reactions by observing chemical phenomena in action. To prepare for your observations and data collection, you must complete the pre-lab activity worksheet that goes with this lab. Otherwise, you will not have the chemical equations you need to match each chemical reaction. Fill in each section of this lab report and submit it to your instructor for grading.
Title:

Objective(s):

Hypothesis:
1. You will complete your hypotheses using the chart below and the balanced equations from your pre-lab activity. In each row, predict the reaction type(s) for each chemical reaction. Reaction type options are synthesis, decomposition, single displacement, double displacement, acid-base reaction, combustion, and oxidation-reduction. Some reactions can fit more than one type of reaction.
Chemical Reaction
Prediction of Reaction Type
Iron and copper (II) sulfate solution
I predict the reaction between and will yield a single replacement reaction/s.
Lead (II) nitrate and potassium iodide solutions
I predict the reaction between and will yield a double replacement reaction/s.
Magnesium metal and hydrochloric acid solution
I predict the reaction between and will yield a single replacement___ reaction/s.
Electrolysis of water
I predict the reaction between and will yield a decomposition reaction/s.
Burning magnesium
I predict the reaction between and will yield a combustion reaction/s.

Procedures:
Access the virtual lab and complete all sections of the experiments. A summary of steps has been provided for you. List and explain your controlled variables, independent variable, and dependent variable for this lab.
Materials:
Reactions in our World Virtual Lab
Variables:
List your controlled variables, independent variable, and dependent variable for each experiment in the chart below. Remember, controlled variables are factors that remain the same throughout the experiment. An independent (test) variable changes so that the experimenter can see the effect on other variables. The dependent (outcome) variable will change in response to the test variable.
Chemical Reaction
Controlled Variables
Independent Variable
Dependent Variable
Iron and copper (II) sulfate solution

Lead (II) nitrate and potassium iodide solutions

Magnesium metal and hydrochloric acid solution

Electrolysis of water

Burning magnesium

Summary of Steps:
1. Iron and copper (II) sulfate solution
Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0-gram iron rod to the solution and observe the reaction.

2. Lead (II) nitrate and potassium iodide solutions
Pour about 2.0 mL of lead (II) nitrate into the test tube. Add 5 to 10 drops of potassium iodide solution to the test tube and record your observations of the reaction.

3. Magnesium metal and hydrochloric acid solution
Place one scoop of magnesium turnings into the test tube. Add hydrochloric acid slowly and observe the reaction. Next, place a burning splint near the mouth of the test tube to test for the presence of hydrogen gas.

4. Electrolysis of water
Use a U-tube with electrodes at each end, connected to a battery. Fill the U-tube with water. Turning on the battery, observe the results at each electrode. Next, test for hydrogen and oxygen gas produced at each end of the tube.

5. Burning magnesium
Place magnesium ribbon in a clean crucible (on a clay triangle above a Bunsen burner). Heat until the magnesium begins to burn.
Data:
Complete a data table that includes reaction observations, balanced equation (from the pre-lab worksheet) identification of reaction type (single replacement, double replacement, synthesis, decomposition, acid-base, oxidation-reduction, or combustion) for each experiment in the lab.
Chemical Reaction
Observations
Reaction Type
Balanced Equation
Example:
Sodium and water
Violent reaction, sodium flames in solution
Single replacement, combustion reaction
2 Na + 2 H2O ---> 2 NaOH + H2
Iron and copper (II) sulfate solution

Lead (II) nitrate and potassium iodide solutions

Magnesium metal and hydrochloric acid solution

Electrolysis of water

Burning magnesium

Answers: 1

Show answers

Answers

Answer from: Quest

according to the u.s. department of agriculture, the label of "certified organic" comes with a set of highly regulated standards for environmental stewardship and resource conservation. some of these include maintenance and improvement of soil quality, prevention of ground and surface water contamination, greenhouse gas regulation, encouragement of biodiversity and conservation of water and energy (see references 1). organic practices integrate natural methods such as mulching, plant diversity, native and adapted plants, crop rotation and the introduction of beneficial insects to control pests without synthetic pesticides.

environmental implications of pesticides

synthetic pesticides ensure high crop yields. while effective in achieving this goal, pesticides contaminate soil, air, ground and surface water, as well as the plants and animals that come into contact with these contaminated sources. freshwater and marine organisms are particularly susceptible to pesticides through agricultural runoff. pesticides also reduce soil fertility (necessitating the use of synthetic fertilizers) and can travel far from the original source, contaminating water and air hundreds of miles from the location of application (see references 2).

health implications of organics

although a subject of particular debate, many recent findings show that organic food is healthier than conventionally grown food. according to the usda, an extensive european union-funded study found that organically grown foods contain more beneficial compounds, such as the vitamins and antioxidants needed to combat many diseases (see references 5). organic milk, meat and eggs are regulated to ensure they are free of hormones administered to conventional livestock and poultry.

health implications of pesticides

pesticides affect human health in three ways: through skin contact, inhalation and ingestion. acute and long-term exposure to pesticides can cause serious health problems for farmers who apply them. the majority of other people are affected by drinking contaminated water and eating contaminated marine life (see references 3). pesticides have been linked to neurological disorders, endocrine and reproductive disorders, immune system deficiencies and cancer. according to the world health organization, acute pesticide poisoning (app) is responsible for significant annual mortality, especially in developing nations (see references 4).

other important considerations

not every small farm or business owner can afford the costly certification process required to be considered "certified organic," even if the farm is not using chemicals. "transitional" farms include those that once used chemicals and are now transitioning to organic-only production. in addition, though organic farming methods offer obvious environmental benefit, an organic apple shipped from around the world creates a different set of environmental problems. locally grown food (particularly locally grown, organic food) is key in sustainable food production.

Answer from: Quest

Show and image of the mixtures or write them

Answer from: Quest

hey there!

mass = 6.75 g

volume = 9 cm³

therefore:

d = mass / volume

d = 6.75 / 9

d = 0.7 g/cm³

answer b

Answer from: Quest

The phase where ice changes directly to gas is called sublimation

Another question on Chemistry

Chemistry, 22.06.2019 07:00

What is the main purpose of patent attorneys? defend the company against legal claims manage financial investments invent new products protect rights to new products and processes

Answers: 1

Answer

Chemistry, 22.06.2019 11:30

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

Answers: 2

Answer

Chemistry, 22.06.2019 12:00

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Answers: 2

Answer

Chemistry, 22.06.2019 14:10

Precision can be defined as the o exact center of a data set. o reproducibility of a measured value. o correlation between two variables that are measured in a data set agreement between a measured value and an accepted value.

Answers: 2

Answer

You know the right answer?

Reactions in Our World Lab Report Instructions: In this laboratory activity, you will be comparing...

Questions