Students noticed that, since the time that grass began to grow on a barren hillside, and water seemed to wash down the slope into the school yard during a rainstorm . The students thought that the grass helped hold the soil in place on the slope. The students predicted that more soil would wash down a slope without grass than a slope covered with grass. To find out if they were correct , the students conducted an experiment with three identical rectangular pans of soil. In pan 1 they planted grass seed and allowed it to grow to several centimeters tall. The students filled pan 2 with only soil. Then they took pan and pan 2and propped up at one end of each pan 15 cm high to create a slope . Pan 3, also filled with only soil, was propped up at one end at one end to create a slope . Students poured equal amounts of water on the raised end of each pan and the students recorded their observations . Which steps in the experimental method are missing from the description above?

Answers

Answer 1
wash down 3 and pan and observe it
Answer 2

These are the missing steps in the experimental method:

Control groupRandomizationReplicationMeasurement and data collectionData analysisConclusion and discussion

Control Group: To present a baseline for comparison, a control group is essential. This enables us to determine whether any effects we find are due to the slope or the independent variable (grass). The control in this experiment is a pan containing dirt but no grass.

Randomization: Randomizing the treatments (grass or soil only) and the order in which the water is applied helps to avoid bias and ensure the accuracy of the findings. Randomization minimizes the influence of extraneous factors that could adversely affect the results.

Replication: Repeating the experiment with multiple sets of pans improves the accuracy of the findings. Replication takes into account variation and increases the certainty of findings.

Data collection and measurement: Accurate estimation of water availability, soil erosion and grass growth is essential. Accurate data collection enables meaningful comparison and analysis.

Analysis of the data enabled the researchers to evaluate whether there was any real difference between the grassed pans and the non-grassy pans. It compares the rate of soil erosion on slopes and takes grass growth into account.

Conclusions and Discussion: Based on the findings, students can make inferences about how grass affects soil erosion. They should talk about the results, possible shortcomings of any experiment, and possible directions for further study.

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Related Questions

Make a generalization about the importance of tools to science.

Answers

Scientists use special tools to do their work. They gather data, or information, as they seek to learn about the world. In order to solve problems they must record data that is accurate and organized. This is an important part of the scientific method.
tools are important of science, because of how and when they are used. we use them for many things especially experiments.

how does the design of an experiment relate to the method of difference?

Answers

Answer:

The design of experiments (DOE, DOX, or experimental design) is the design of any task that aims to describe and explain the variation of information under conditions that are hypothesized to reflect the variation. The term is generally associated with experiments in which the design introduces conditions that directly affect the variation, but may also refer to the design of quasi-experiments, in which natural conditions that influence the variation are selected for observation.

Explanation:

Experimental design refers to how participants are allocated to the different groups in an experiment. Types of design include repeated measures, independent groups, and matched pairs designs.

How many liters of 4.0 M NaOH solution will react with 1.2 mol H2SO4? (Remember to balance the equation.)

H2SO4 + NaOH → Na2SO4 + H2O

A. 1.6 L
B. 1.2 L
C. 0.90 L
D. 0.60 L

Answers

Answer:

The answer is D. 0.60 L

Explanation:

The balanced reaction equation including states of matter is;

H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l)

More simple:

H2SO4 + 2NaOH → Na2SO4 + 2H2O

Now, we can see from this reaction equation that the mole ratio of NaOH to H2SO4 is 2:1

Number of moles of H2SO4 reacted = 1.2 moles

Hence;

2 moles of NaOH reacts with 1 mole of H2SO4

x moles of NaOH reacts with 1.2 moles of H2SO4

x = 2 * 1.2/1 = 2.4 moles of NaOH

Recall that;

Number of moles = Concentration * Volume

Volume = number of moles/concentration

Volume of NaOH  is obtained from;

Volume = 2.4 moles/ 4.0 M

Volume =  0.60 L

The answer to this is D

Timothy always liked playing catch with his dad. Whenever he had the chance to pick up a small object, he simultaneously threw a random object at his dad to catch him of guard. His objective was to have his dad drop the item. One day, Timothy threw two objects at is dad. One object was a tennis ball and the other was a golf ball. His dad ended up dropping both of the objects on the floor but was able to catch them after the drop because they both bounced back into his father’s hands. He wondered how this was possible???? This led to Timothy asking a science question that he would like to test by doing an experiment. What science question do you think Timothy asked to jumpstart an investigation?


THIS IS SCIENCE BTW BUT PLEASE HELP I WILL GIVE BRAINLIEST TO THE MOST ACCURATE AMSWER

Answers

How the objects dropped and bounced up for the fathers hands to touch it
"What causes objects to bounce after being dropped?" :)

Which of the following steps correctly converts 6 grams of fluorine to an equivalent number of moles of fluorine?

A. Divide 6 by the atomic mass of fluorine.
B. Divide the atomic mass of fluorine by 6.
C. Subtract 6 from the atomic mass of fluorine.
D. Multiply the atomic mass of fluorine by 6.

Answers

Answer:

A

Explanation:

mole=mass of the element ÷ atomic mass of the element.

mole=6÷atomic mass of flourine.

The step at A correctly converts 6 grams of fluorine to an equivalent number of moles of fluorine. That is "Divide 6 by the atomic mass of fluorine".

What is one mole of a substance?A mole is defined as the mass of the substance which consists of an equal quantity of basic units.One mole of any substance is equal to the value of 6.023 x [tex]10^2^3[/tex] (Avagadro number). It can be used to measure the products obtained from the chemical reaction. The unit is denoted by mol.The formula for the number of moles formula is expressed as the number of moles of the substance =  mass of the substance/ mass of one mole of the substance

How to calculate the number of moles of fluorine equivalent to 6 grams of fluorine?

Given that,

The mass of fluorine = 6 grams

The atomic mass of one mole of fluorine = 18.99

So, the number of moles of 6 grams of fluorine= [tex]\frac{6}{18.99}[/tex]

Therefore, the step is given in option A: "Divide 6 by the atomic mass of fluorine" is the correct step that converts the 6 grams of fluorine to an equivalent number of moles of fluorine.

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Cells are mostly made of

Answers

Answer:

organic molecules: nucleic acids, proteins, carbohydrates, and lipids

Answer:

organelles

Explanation:

idrk if it right but it reminded me of a song my teacher would play

"cells, cells their made of organelles"

Using the line graph below, find the independent and dependent variables.

Answers

Answer:

The independent variable in on the x-axis, and the dependent variable is on the y-axis.

Explanation:

The independent variable belongs on the x-axis (horizontal line) of the graph and the dependent variable belongs on the y-axis (vertical line). The x and y axes cross at a point referred to as the origin, where the coordinates are (0,0).If you are confused, please check out this website talking more in-depth about graphing!

https://www2.nau.edu/lrm22/lessons/graph_tips/graph_tips.html#:~:text=The%20independent%20variable%20belongs%20on,are%20(0%2C0).

independent is on x-axis and dependent is on y-axis!

A chemical change occurs when two or more substances join to form new substances with new ______________ properties

Answers

Answer:

hope this helps!

Explanation:

In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

Relate two factors that can limit the accuracy and precision of measurements.

Answers

Variables such as temperature, humidity, pressure, gravity, elevation, vibration, stress, strain, & lighting
Hope this helps

Temperature, humidity, pressure, gravity, altitude, vibration, stress, strain, and illumination are among the variables.

What are precision and accuracy?

Accuracy is the capacity of an instrument to measure the precise value. In other words, it refers to how closely the measured value resembles a reference or genuine value. Small readings can be taken to increase accuracy. The calculation's inaccuracy is decreased by the little reading.

The precision of a material is defined as the degree to which two or more measurements agree with one another. It is incredibly precise but not always accurate to measure something if you weigh it five times and get 3.2 kg each time. Accuracy is not necessary for precision.

The degree to which a measurement is accurate in relation to its real value. The degree to which the same results are produced by repeated measurements under the same circumstances is known as precision.

Therefore, temperature, humidity, pressure, gravity, altitude, vibration, stress, strain, and illumination are among the variables.

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Identify the 3 types of variables for each example experiment below, and then provide an explanation as to why you identified the variables in the way that you did. The variables include the following: independent variable, dependent variable, and the control variable.


Example 1: You would like to add some depth and charm to your garden by adding different sized plants to your garden. You’ve done some research and would love to plant chimney bellflowers because of their appeal and height. One of the questions that comes to your mind is “which brand of fertilizer to use in order to produce the tallest bellflowers?”


Example 2: Your younger brother has asked that you help him with his 5th grade science fair project. One of the areas he is interested in knowing more about is acid rain. You decide to simulate acid rain by creating an experiment that involves vinegar and limestone chips. You and your brother decide to determine if the amount of vinegar will impact limestone chip mass. You set up four different treatments. Each treatment will contain a different percentage or concentration of vinegar but with the same initial mass of limestone chips. You both make a hypothesis and discuss how it relates to acid rain together, and then illustrate the results on a trifold board.


Example 3: In your biology class, you’ve learned a lot about marine ecosystems. It has created an interest in maybe one day being a marine biologist. You’ve decided that you will design an experiment that looks at the impact of rising sea temperature on the quantity of algae in a specific ocean site. You will determine the number of algae under varying temperatures at this ocean site. You are hoping that these findings will help you become more of an advocate for marine life in this time of global climate change.

NEED ASAP I WILL GIVE Brainliest

Answers

Answer:

Example 1:

Independent variable = The brand of fertilizer

Dependent variable = The height of the chimney bellflower measured (in cm or m) using a ruler or metre stick or measuring tape etc

Control variable = The type of flower used i.e., chimney bellflower

Example 2:

Independent variable = The percentage/concentration of vinegar

Dependent variable = The (change in) mass of the limestone chips measured (in g or kg) using a scale

Control variable = The initial mass of the limestone chips

Example 3:

Independent variable = The temperature of the seawater

Dependent variable = The quantity of algae in a specific ocean site

Control variable = The ocean site and the starting amount of algae in it

Explanation:

The independent variable is the variable in an experiment that it changed e.g., in example 1 the test was about which brand of fertilizer would produce the tallest bellflowers. Therefore, to test this, you would have to experiment with different brands of fertilizers thus constantly changing it in the experiment.

The dependent variable is the variable in an experiment that is measured e.g., in experiment 2 the test was about if the mass of the limestone chips would change with different concentrations of vinegar. Therefore, to test this, you would have to measure if there was a change in the mass of the limestone chips thus making it the dependent variable

The control variable is the variable in an experiment that you keep the same e.g., in experiment 1, in order to test which brand of fertilizer produced the tallest bellflowers, you would have to keep the type of flower the same (i.e. chimney bellflowers) because that is the flower you are experimenting. It would not make sense to use a different flower since that could produce different, incorrect data

Variables are an important part of an eye tracking experiment. A variable is anything that can change or be changed. In other words, it is any factor that can be manipulated, controlled for, or measured in an experiment.

Experiments contain different types of variables. We will present you with some of the main types of experimental variables, their definitions and give you examples containing all variable types.

Types of experimental variables:

Independent variables (IV): These are the factors or conditions that you manipulate in an experiment. Your hypothesis is that this variable causes a direct effect on the dependent variable.
Dependent variables (DV): These are the factor that you observe or measure. As you vary your independent variable you watch what happens to your dependent variable.

Figure 1. Shows the relationship between the independent and dependent variable.

Extraneous variable: An extraneous varable is any extra factor that may influence the outcome of an experiment, even though it is not the focus of the experiment. Ideally, these variables won’t affect the conclusions drawn from the results as a careful experimental design should equally spread influence across your test conditions and stimuli. Nevertheless, extraneous variables should always be considered and controlled when possible as they may introduce unwanted variation in your data. In this case, you need to tweak your design and procedure to be able to keep the variation constant or find a strategy to monitor its influence (constant or controlled variables). All experiments have extraneous variables. Here are some examples of different types of extraneous variables:
aspects of the environment where the data collection will take place, e.g., room temperature, background noise level, light levels;
differences in participant characteristics (participant variables); and
test operator, or experimenter behavior during the test, i.e., their instructions to the test participants are not consistent or they give unintentional clues of the goal of the experiment to the participants.

Balance the given equation
2Cu + _____ = CuO + _____

Answers

Answer:

2Cu+2H20=2CuO+2H2

2Cu + 2H2O = 2CuO + 2H2

In 1945, a Raytheon engineer named Percy Spencer was fiddling with energy sources for radar equipment. While testing a new vacuum tube, he discovered that a chocolate bar he had in his pocket melted more quickly than he would have expected. He became intrigued and started experimenting by aiming the tube at other items, such as eggs and popcorn kernels. All of the things he aimed at responded as it they were being cooked. What can Percy Spencer infer from this observation?

A.) The energy source he was using had no effect on other substances.
B.) The energy source he was testing was able to cook foods.
C.) The energy source he was testing created heat.
D.) The energy source he was testing made substances respond as if they were being heated.

Answers

Step by step explanation:
C Energy source was creating heat

Descriptive Lab Report Guide exploring cells answer

Answers

https://www.coursehero.com/file/78944545/Exploring-Cells-Lab-Reportdocx/ that is a website with a lab report on exploring cells
Like what kind of lab report do u have

Answer this question and you’ll get 20 points Explain how energy is transfers using the major forms of energy in a circuit describe the energy source and form as energy is transformed throughout the circuit. Give at least 3 forms of energy. Including 2 transformations that occur. Make sure to provide the evidence that would indicate how we would know that the energy is complete within the circuit

Answers

Answer:

When the fuel is burnt, the hot gas rushes out of the rocket due to the great heat and pressure produced by the release of chemical energy in burning. Energy transfer is the movement of energy from one location to another. Energy transformation is when energy changes from one type to another.

Explanation:

When the fuel gets burned gasses rush out of the rocket

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Answers

Answer:A

Explanation:A is the answer

Answer:

Explanation:

Option D because they have to substitute each other

What object is shown in this image?

a nebula
a red giant
a supernova
a neutron star

Answers

the guy who previously answered before me is wrong. it’s A) A nebula

The object shown in the given image is a nebula. Therefore, option A is correct.

What is a nebula?

A nebula can be described as a distinct luminescent of the interstellar medium, which can contain neutral, ionized, or molecular hydrogen and cosmic dust. In these regions, the formations of dust, gas, and other materials "clump" to form denser regions, which attract matter, and become dense enough to form stars.

There are several formation mechanisms for the different kinds of nebulae. Some nebulae are formed from gas that is in the interstellar medium while others are formed by stars.

Star-forming regions can be defined as a class of emission nebula with giant molecular clouds. These produce a molecular cloud that collapses under its weight, producing stars.

Most nebulae have vast sizes while some are hundreds of light years in diameter. The Orion Nebula is the brightest nebula in the sky and occupies an area twice as the full Moon, and can be viewed with the eye.

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Give an example of a hypothesis not mentioned.
please help meee

Answers

Excuse but how do you ask others for help because I really need help with this right now
I would advice to show the hypothesis already listed
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