Independent and Dependent Variable Practice

DIRECTIONS: Read the information about each experiment and record the independent variable (IV) and dependent variable (DV). Then write a hypothesis for each experiment. Be sure to use an “if, then, because” statement.

Will an egg float higher in water with more salt?

IV:

DV:

Hypothesis:

Willy and Billy want to know if stretching a rubber band at different lengths affects how far the rubber band will fly. They will use centimeters for all measurements.

IV:

DV:

Hypothesis:

Will a paper airplane with longer wings fly farther than shorter wings?

IV:

DV:

Hypothesis:

Will a plant grow higher with more light?

IV:

DV:

Hypothesis:

Milly and Bob want to know if the amount of baking soda added to vinegar will affect the height a rocket will launch. They will measure the baking soda in milliliters. They will measure the height of the rocket launch in meters.

IV:

DV:

Hypothesis:

Carrie and Heather wanted to know if the size of a coin will affect the number of drops of water it can hold. So they use a dropper to place water on a quarter, nickel, and penny.

IV:

DV:

Hypothesis:

I wonder if the amount of studying I complete has an effect on my science test scores?

IV:

DV:

Hypothesis:

Answers

Answer 1

Answer:

1) IV: The quantity of salt added

DV: The resultant density of the salinated water

Hypothesis: The egg will float when the  mass of the volume of the salinated solution displaced by the egg is equal to or larger than the mass of the egg

2) IV: The extension of the rubber band above original length in centimetres

DV: The distance flown by the rubber band

Hypothesis: The potential energy stored in the rubber band by pulling will be transformed into kinetic energy and the larger the extension, the larger the stored potential energy, and the larger the resultant kinetic energy, the higher the velocity and the further the distance flown

3) IV: The wing span of a paper airplane

DV: The distance flown by the plane

Hypothesis; The glide of the airplane is a factor of the wings span increased wingspan increased glide and increased travel distance

4) IV: Presence of more light

DV: Height to which plant grows

Hypothesis: Photosynthesis, which is the conversion of carbon dioxide and water into glucose and oxygen in the presence of Sunlight is essential for plant growth and the more the presence on light is increases the higher plant will tend to grow

5) IV: Amount of vinegar in the canister

DV: The height a rocket will launch

Hypothesis: With a given amount of baking soda, in the canister a little amount of vinegar causes a delayed launch but an increased build up of carbon dioxide resulting in higher height reached than when more vinegar is used in which case the lift off will be more rapid but the power will be lesser and the height reached reduced

6: IV: Surface area of the coin

DV: The number of drops held

Hypothesis: Due to surface tension and cohesion which are properties that increase with surface area and as such a coin with a larger surface area holds more water drops

7. IV: Number of hours of study

DV: Science score

Hypothesis: A student science scores is directly related to the amount of science topics thought the student is able to respond to in a test and it is directly proportional to the amount of study the student has done  related to the science topics

Explanation:


Related Questions

Do you think cystic fibrosis or muscular dystrophy, genetic disorder, would show up in a person's DNA fingerprint profile? Explain your Reason Please.

Answers

Answer:

we can find such type of genetic disorders through pedigree chart.

Explanation:

cystic fibrosis is a Autosomal recessive disease

Muscular dystrophy is a Autosomal dominant disease.we can see them by observing the next generations going on .we can't find them in person's DNA fingerprint profile.

Based on fossilized evidence, there are scientific claims made about the evolution of certain species. If a scientist studying the fossils of a specific species had a hypothesis other than what was currently accepted, what steps should be taken to have the alternative hypothesis considered

Answers

Answer: For the scientist to have alternative hypothesis considered, it is imperative he takes certain steps, this steps will ascertain the scientific claims already made about the evolution of species.

Therefore,the scientist will simply test the alternative hypotheses inorder to know that they are incorrect.

This testing of hypotheses to ascertain their incorrectness is very useful in the study of fossils.

what is the defination of matter?​

Answers

Answer:

matter is a kind of substance

Answer:

any thing that has a mass and occupies space is called matter

Explanation:

for example

a book is a matter because it has a mass and it also occupies some space

Motor vehicles move, use energy and produce carbon dioxide and water. similar characteristics occur in living organisms yet motor vehicles are not classified as living. list the other characteristics of living that do not occur in motor vehicles

Answers

Explanation:

Motor vehicles don't

#produce; 

#grow;

#Respond to stimuli/ irritability;

The characteristics of living that a motor vehicle lacks include the ability to feed, respond to stimuli, grow, reproduce, and die.

Living organisms carry out nutrition, unlike motor vehicles.

Living organisms are able to respond to external stimuli but motor vehicles cannot.

Living organisms are able to grow/increase in size, motor vehicles have fixed sizes.

Living organisms have the capacity to reproduce for continuity, motor vehicles lack this ability.

After some time, living organisms die, motor vehicles do not die naturally.

More on the characteristics of living things can be found here: https://brainly.com/question/280237?referrer=searchResults

Mendel always got close to a 9:3:3:1 ratio for phenotypes in the F2 generation of any dihybrid cross. If false, make it a correct statement

a. True
b. False

Answers

Answer:

True

Explanation:

It is true that Mendel always got close to a 9:3:3:1 ratio for phenotypes in the F2 generation of any dihybrid cross. This validates his law of independent assortment of genes.

The 9:3:3:1 is usually gotten from any dihybrid cross of F2 generation. The results given are always 9 offsprings containing dominant traits, 3 offsprings each which possess a dominant and recessive trait and 1 offspring with a recessive trait.

Water intoxication results from: A. Dilute body fluids B. Osmosis of water from ICF to ECF C. Decrease in water intake D. Decrease in the osmolarity of interstitial fluids E. Dilute body fluids and a decrease in the osmolarity of interstitial fluids

Answers

Answer:

E.  Dilute body fluids and a decrease in the osmolarity of interstitial fluids

Explanation:

When there is excessive water intake into the body, it can lead to water intoxication. It occurs as result of a combination of dilute body fluids and decrease in the osmolarity of interstitial fluids.

When excess water is taken into the body, the extracellular fliuds become very dilute, this results in a decrease in osmolarity , therefore, water will then move into the intracellular fluid by osmosis in order to establish equilibrium.. This causes the cells to swell, and in the brain, this swelling will result in increase in pressure within the cranium. This increase in pressure leads to the symptoms found in water intoxication such as nausea, confusion, and fainting. If not treated, it can result in death.

From the given options;

A. Dilute body fluids is only a part of the cause

B. Osmosis of water from ICF to ECF does not result in water intoxication because in water intoxication, water moves into the ICF from ECF

C. Decrease in water intake is wrong because it is an increase in water intake that results in water intoxication

D. Decrease in the osmolarity of interstitial fluids is only one part of the cause of water intoxication

E. Dilute body fluids and a decrease in the osmolarity of interstitial fluids is the correct option.

Based on your knowledge of our solar
system, how do you think it originally
formed?

Answers

Answer:

Our sun oriented framework shaped almost 4.5 billion a long time back from a thick cloud of interstellar gas and tidy. The cloud collapsed, conceivably due to the shockwave of a adjacent detonating star, called a supernova. When this tidy cloud collapsed, it shaped a sun oriented nebula—a turning, twirling disk of fabric.

Detectives work in three different locations when processing evidence. Which is the correct order for the locations of processing evidence? a. in the forensic lab, analyzing evidence b. in the court, testifying about their findings c. at the crime scene, collecting evidence 1. a, b, c 2. b, c, a 3. c, b, a 4. c, a, b

Answers

Answer:

The correct order is option 4. c, a, b.

Explanation:

Evidence collection and processing involves three different locations and this processing and analyzing is done by the detectives. The first location is the crime scene at which detectives collect the evidences such as photographs, blood traces and samples, fingerprint and other physical evidences without manipulating them.

Second location of processing evidences is at forensic lab at which the evidences are thoroughly tested and analyzed and match with prior records. The final location is in the court house where all the evidences and finding about them are testified.

Thus, the correct order is : option 4. c, a, b.

Why do farmers need to know about their plant life cycle? What is the essense

Answers

Answer:

certain plants have different life cycles as for some are "evergreen" meaning that they will never die as long as they have nutrients and are in the right heat envirement. a good example of this is artichokes when planted from a seed they grow the first year and the second year they start to produce. another good example is corn it grows during certain seasons. after the season the corn is cut down and replanted next season

Explanation:

Drag each characteristic to the correct location on the phylogenetic tree. Complete the phylogenetic tree by matching each characteristic that arose during the evolution of animals to its correct position.

Answers

Answer:

The correct characteristics are - tissue, coelom, segmentation, endoskeleton, and backbone from top to bottom boxes.

Explanation:

Answer:

issue, coelom, segmentation, endoskeleton, and backbone

Explanation:

plato


It corresponds to the formula of an acid oxide and a basic oxide:

Select one:

A. P2O3 y BaO
B. Mag y N2O5
C. FeO Y SO3
D. HNO y CaO

Answers

Answer:

P2O3 y BaO

Explanation:

The oxides of the main group metals are basic in nature. They form alkaline solutions when dissolved in water. Similarly, the oxides of main group non metals form acidic solutions when dissolved in water.

P2O5 is an oxide of a main group nonmetallic element in group 15. We expect this oxide to be acidic and form acids when dissolved in water as expected from the chemistry of the group.

Also, BaO is an oxide of barium, a group two main group metal. Hence we expect this oxide to be basic in nature and form alkaline solutions.

When a volcano erupts, tiny particles from which of Earth's spheres are released into the air?
atmosphere
biosphere
geosphere
hydrosphere

Answers

The geosphere :) that’s where the earth’s mantle and crust is which is where the volcanoes are. So, when they erupt pieces of them are released from the level which they came from (aka the geosphere) hope that helps!

When a volcano erupts, tiny particles from the geosphere are released into the air. So, the correct option is C.

What is Volcano?

A volcano is a geological formation on the surface of the Earth that develops as magma and volcanic ash build up. During an eruption, lava, ash, and gas can escape through a crater or vent that is generally shaped like a mountain.

Explosive or non-explosive eruptions can have a large negative impact on the environment, causing ash fall, landslides, and lava flows, among other things. Tiny geosphere-derived particles are discharged into the atmosphere during volcanic eruptions.

All areas of volcanism contain compound volcanoes, but these volcanic structures are most common at plate convergence zones, where one tectonic plate plunges beneath another towards the earth's mantle.

Therefore, the correct option is C.

Learn more about Volcano, here:

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Common symptoms of iron-deficiency anemia include muscle weakness, shortness of breath, and lightheartedness. Why does iron deficiency cause these symptoms?

Answers

Answer:lack of blood flow and blood concentration

Explanation:

Why is milk pack showing green tag, its a animal product so it should show red tag right? ​

Answers

Because milk is vegetarian and vegetarian food and drinks are shown with a green tag to make people aware that it's vegetarian!

That's my opinion! :)

an antibiotic is a type of medication that cures infectious diseases. why does the word antibiotic suggest that these medications would be ineffective against viruses?​

Answers

Answer:

An antibiotic treats bacterial infections, not viral ones. For viruses, you would take antiviral medications.

Shannon is making a Venn diagram to organize the characteristics of cell walls and cell membranes. Which pair of characteristics both belong in the two areas of the Venn diagram that do not intersect?

helps with communication; contains mostly cellulose
contains mostly cellulose; forms the outer layer of animal cells
is found in plant cells; is found in animal cells
is semipermeable; found in animal cells

Answers

Answer:the answer is the second

Because cell wall made up of most cellulose while cell membrane the outer if the animal cell

Answer:

B.

contains mostly cellulose; forms the outer layer of animal cells

Explanation: just took the test(❁´◡`❁)

structure of leaf is complementary to its function explain

Answers

The leaf has a thin lamina, mid rib and network of veins. The large surface area of the lamina helps in the absorption of light and its thin nature minimizes the diffusion process for gaseous exchange.Hope this will help

Answer:

All leaves have the same basic structure - a midrib, an edge, veins and a petiole. The main function of a leaf is to carry out photosynthesis, which provides the plant with the food it needs to survive. Plants provide food for all life on the planet.

Explanation:

what are the problems and the challenges in classifying living things​

Answers

Answer:

the problems are that there are so many different species that they aren't easy to classify.

The century cactus flowers every 100 years. A similar and nearby cactus flowers every 50 years. If the 50-year-cactus pollen has the correct characteristics to fertilize the century cactus, which reproductive barrier will most likely be working against that possibility

Answers

Answer:

Temporal isolation

Explanation:

Temporal isolation, a type of reproductive barrier caused by variations in the timing of mating receptivity, activity, or fertility, prohibits interbreeding between different but closely related species.

What is the temporal barrier in reproductive isolation?

In biology, temporal isolation is a form of reproductive isolation mechanism that prevents members of closely related species from mating and creating hybrid offspring.

Temporal isolation refers to the situation where two or more species reproduce at various periods. For instance, three different types of orchids live in the same rain forest.

This mechanism arises from differences in the timing of crucial reproductive events.

Therefore, Temporal isolation reproductive barrier will most likely be working against that possibility.

Learn more about reproductive isolation here:

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Please write down prearation of perment slides of pollen grains by acetolysis method and study of different pollen characters: study of variation pattern in different taxa.

Answers

Answer is given below

Explanation:

Collection and preservation of pollen material: In clean glass pots containing 70% glacial acetic acid, some of the stamens are applied with clean forceps prior to flower synthesis and sometimes protected from diamonds or mature flower buds. Some polyologists recommend 70% ethyl alcohol to preserve feathers in place of glacial acetic acid. In this condition, pollen-filled feathers can be stored indefinitely.  The wings are transferred to a centrifuge tube and rinsed well with distilled water.the wings are crushed with a glass rod and the mixture is filtered through a cheesecloth or sieve. The lower part is recalled in the centrifuge tube.  A freshly prepared acetolysis mixture containing acetic anhydride and concentrated H2SO4 (sulfuric acid) in a ratio of 9: 1 is poured into a centrifuge tube containing the washed pollen. Care must be taken to connect the conceider. H2SO4 by acetic anhydride drop to prevent overheating. The acetolysis solution reacts violently with water. Glacial acetic acid washers are required to replace water with acetic acid, which does not react violently with the acetolysis solution. Although the acetolysis process varies from pathologist to pulmonologist, the following approach seems to be the most appropriate. From the first to the last acetic acid wash, care is taken regardless of the water solution. Only distilled water should be used for washing to prevent contamination.

Why is the communication results circle linked to the circle labeled science and society

Answers

Answer:

Because these circles have three factors that are directly interconnected.

Explanation:

As you know, communication is one of the primary factors for the creation and maintenance of societies. Societies grow and develop with communication as a starting point and a link between people and the actions that a society lives.

Science, in turn, is also directly influential in the creation and development of society, since it is a transforming factor that shapes society through its constant evolution.

As science evolves, society changes and communication must accompany these changes, so that both society and science continue to exist.

For this reason, we can say that the circle of communication results is linked to the circle called science and society, because these factors are directly interconnected.

Redactar un ensayo reconociendo y valorando nuestra identidad, patrimonio histórico y cultural:

Answers

La respuesta correcta para esta pregunta abierta es la siguiente.

Desafortunadamente no mencionas el país donde vives, para redactar el ensayo tomando en cuenta los valores y cultura de ese país. Sin embargo, te pongo  el ejemplo de mi país. Tu ajusta las ideas al tuyo. Deseo que te sirva.

Uno de los más grandes atributos que tenemos los Mexicanos es nuestra reconocida variedad cultural, lo cual nos da una identidad única en el mundo.

Somo un país con una de las historias más ricas del planeta, ya que somos descendientes de civilizaciones tan antiguas como la Olmeca y la Tolteca, además de los grandes imperios Maya y Azteca, dos grandes culturas de Mesoamérica.

Cada región en los 32 estados del país, es un México diferente. Lo que nos une es esa preciosa bandera tricolor, con nuestro símbolo patrio: un águila devorando una serpiente.

Somos un país donde se encuentran muchos de los sitios arqueológicos más importantes de las civilizaciones antiguas. Por ejemplo, el mundo Maya: Chichen Itza(petrimonio de la Humanidad por parte de la UNESCO), Palenque, Uxmal, Tulum, entre muchos otros. O el sitio arqueológico de Cholula, con la pirámide cuya nase es la más grande del mundo. En Oaxaca está el sitio arequológico de Monte Albán. Y por su puesto, la gran ciudad de los dioses, Teotihuacán, con sus imponentes pirámides del Sol, la Luna, y el Quetzalcoatl.

Nuestra comida es reconocidamundialmente por su sasón, sabor, y variados ingredientes. La Yucateca y sus papatzules o huevos motuleños. ¡Qué decir de la cochinita pibil! La Poblana con su riquísimo mole, cemitas o chalupas. El cabrito en el estado de Nuevo León. En fin, no hay estado en donde no haya una receta propia para cocinar enchiladas, tacos, sopes, tlacoyos, huaraches, tostadas, tlayudas, o tamales.

No cabe duda que los Mexicanos nos sentimos orgullosos de 600 años de historia, luchas, independencia y la solidaridad que nos caracteriza como país.

what is the uses of forest​

Answers

We depend on forests for our survival, from the air we breathe to the wood we use. Besides providing habitats for animals and livelihoods for humans, forests also offer watershed protection, prevent soil erosion and mitigate climate change.

Answer:

Forests are increasingly managed for a variety of uses and values, often in combination. ... Forests and trees outside forests provide many different products, ranging from timber and fuelwood to food (berries, mushrooms etc.), fodder, and other non-wood forest products.

Which ecosystem service would suffer from the opening of a mineral mine along a small mountain range?

A. Cultural
B. Provisioning
C. Regulating
D. Supporting

Answers

Answer:

D. Supporting

Explanation:

Ecosystem services include provisioning, regulating, culture and supporting services.

Opening of a mineral mine along a small mountain range will affect the supporting services of ecosystem because supporting services deals with soil formation, provision of habitat and nutrition cycle.

Opening of mineral mine will destroy the tosoil, landscape, forests and wildlife of mountain area which affect the supporting services such as habitat and soil formation.

Hence, the correct answer is "D. supporting".

What substances transported by plants 1) xylem vessels and trachieds? 2) sieve tubes of phloem?

Answers

Answer:

Explanation:

xylem vessels transport water and nutrient from roots to the other parts of the plant

trachieds are elongated in the xylem of vascular plant that play role in the transport of water and mineral salt

seive tube are the elongated living cells of the phloem in the flowering plant  they are the conduits of food (mostly sugar) transport

Eye color is an example of 1. Transcriptional control 2. gene expression 3. translational control 4. gene regulation

Answers

Answer: Gene expression

choose the animal belonging to pisces group: silver fish, sea horse,dolphin, lobster. answer asap! thx​

Answers

Answer:

The correct answer is

Explanation:

Lobster is the answer. People eat lobster in pieces which we call as lobster piece.

Hope this helps....

Have a nice day!!!!

Variation in rates of cell division is regulated by a cell-cycle control system—a group of molecules, mostly proteins, within a cell that coordinates the events of the cell cycle. This control system functions through a system of checkpoints. Which assessment occurs at the G2/M checkpoint?

Answers

Answer:

See the answer below

Explanation:

At the G2 checkpoint, the accuracy of chromosome replication is assessed along with the cell size and proteins within the cell. The cell division will only proceed if all the listed conditions appear all right.

At the M checkpoint, the correct attachment of spindles to the kinetochores of the sister chromatids of each chromosome is assessed. This is to ensure that chromosomes are correctly separated to the opposite poles of the cell.

All of the following statements about NAD are true except: Group of answer choices NAD is reduced to NADH during both glycolysis and the Krebs cycle. NAD has more chemical energy than NADH. NAD is reduced by the action of enzymes. NAD can receive electrons for use in chemiosmosis. NAD can be recycled many times.

Answers

Answer:

"NAD has more chemical energy than NADH" is the FALSE statement.

Explanation:

It is totally true that NAD can be recycled many times, it can actually receive electrons for use in chemiosmosis and is reduced by the action of enzymed. During both glycolysis and the Krebs cycle. All these statements are true. But when it comes to NAD and NADH, it is false that NAD has more chemical energy than NADH. There is actually more energy in one NADH, that can lose electrons to transfer energy.

How are the hours of darkness linked to the flowering time in plants?

Answers

Answer:

Hope it helps

Explanation:

plants flower as days grow shorter (and nights grow longer) after 21 June in the northern hemisphere, which is during summer or fall. The length of the dark period required to induce flowering differs among species and varieties of a species.

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