Answer:
independent variable: Temperature
dependent variable: Plant growth
experimental control/constants: Same type of beans
Explanation:
Independent variable is the variable that the experimenter changes or manipulates in an experiment in order to bring about a measurable response. According to this question, the experimenter changes the TEMPERATURE to determine the beans' growth. Hence, TEMPERATURE is the Independent variable.
The dependent variable is the variable that the experiment measures in an experiment. In this case, the measured variable, which is the PLANT GROWTH is the dependent variable.
Experimental control or constants or controlled variable is the variable that is kept unchanged by the experimenter throughout the experiment. In this case, the experimenter will use the SAME BEANS for all groups of the experiment. Therefore, the BEANS is the constant.
For an experiment to determine the temperature at which beans sprout the fastest, the independent variable would be temperature, the dependent variable would be height/number of leaves of plants, and all other variables would be constant variables.
The independent variable is the manipulated variable supplied during research. In order to determine the temperature at which beans sprout the fastest, different planted beans would be subjected to variable temperatures. Hence, the temperature is acting as the independent variable in this case.
The dependent variable is the variable measured in the course of research whose value is dependent on the manipulated variable supplied. In this case, the growth of the beans would vary depending on the temperature they are allowed to grow in. Thus, the growth indicators such as height, number of leaves, etc., would be the dependent variable.
Controlled/constant variables are those factors that are kept the same in all subject groups during the course of research. Apart from the independent and dependent variables, conditions should be kept the same for all subjects. All these conditions are referred to as controlled/constant variables.
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Which commercial technology commonly uses plasmas? a radio a race car a television a microwave oven
Answer:
c
Explanation:
The commercial technology commonly uses plasma is a television. The correct option is c.
What is commercial technology?Commercial technology is any technology that is employed in the business world, including electric power, radio, television, phones, and other similar devices. These items are employed commercially in a variety of fields. An electrical gadget called television is used to watch entertainment.
Plasma is a substance found in televisions; these gas-filled pockets receive electricity to transform into plasma screens. The UV rays that these plasmas then emit create a picture as they pass through the phosphorus cells.
Thus, the correct option is c. a television, regarding a commercial technology that commonly uses plasmas.
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how are covalent molecules named?
What is the most common solvent that is used in a solution?
Answer:
It's water.
Explanation:
Water is also called as universal solvent, because it's literally almost the only one we use.
Sorry if I spelled something wrong. I'm Dominican so yeah . I hope this helps you :)
How does the color of light relate to the energy? Please answer with 3-5 sentences.
Answer:Wave frequency is related to wave energy. Since all that waves really are is traveling energy, the more energy in a wave, the higher its frequency. The lower the frequency is, the less energy in the wave. ... When it comes to light waves, violet is the highest energy color and red is the lowest energy color.
Explanation:
write the name of the main gases in the air
Answer:
Nitrogen
Oxygen
Argon
Carbon Dioxide
Methane
Ozone
Explanation:
N₂ accounts for 78% of the atmosphere.
O₂ accounts for 21% of the atmosphere.
Ar accounts for 0.9% of the atmosphere.
CO₂, CH₄, and O₃ only take up 0.1% of the atmosphere.
Answer:Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.
Explanation:
3.50 moles of helium gas, initially at a pressure of 2.80 atm and a temperature of 180.0
∘
C, expands at constant temperature until its volume has tripled. Constant-pressure compression then returns the gas to its initial volume. The gas is ideal, monatomic, and has a molar mass of 4.0026 g/mol. Construct a qualitatively accurate, fully labeled p−V diagram representing these two processes, and evaluate the net heat transferred to the gas.
The net heat transferred to the gas in this process is zero.
To construct the p-V diagram, we need to analyze the given processes and understand how the pressure and volume change.
Process 1: Expansion at constant temperature
The initial state is given as 3.50 moles of helium gas at a pressure of 2.80 atm and a temperature of 180.0 °C.
The gas expands at constant temperature until its volume has tripled. Since the temperature remains constant, the gas follows Boyle's Law, which states that the product of pressure and volume is constant: P₁V₁ = P₂V₂.
Since the volume triples, V₂ = 3V₁.
Therefore, the pressure decreases to one-third of the initial pressure, P₂ = P₁/3. We can plot this as a horizontal line at constant temperature.
Process 2: Constant-pressure compression
After expansion, the gas undergoes constant-pressure compression and returns to its initial volume. This means the volume decreases while the pressure remains constant at P₂. We can plot this as a vertical line.
Combining both processes, the p-V diagram will consist of a horizontal line followed by a vertical line, forming a rectangular shape.
To evaluate the net heat transferred to the gas, we need to consider that the process occurs at constant temperature.
In an ideal gas, at constant temperature, the net heat transferred is zero according to the first law of thermodynamics.
This is because any heat added to the gas during expansion is equal to the heat extracted during compression.
Therefore, the net heat transferred to the gas in this process is zero.
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A sample of argon has a pressure of 2.17 atm at 32°C.At what Celsius temperature will the argon sample reach a pressure of 2.83 atm?
Okay, here are the steps to solve this problem:
1) We are given the pressure (P) of argon at 2.17 atm and temperature (T) of 32°C.
2) We need to find the temperature at which the pressure increases to 2.83 atm.
3) For an ideal gas like argon, the pressure and temperature are directly proportional. We can use Boyle's Law:
P proportional to T (at constant volume)
4) Set up a proportion:
(2.17 atm) / (32°C) = (2.83 atm) / (x °C)
5) Solve for x:
x = (2.83 atm * 32°C) / (2.17 atm)
x = 43°C
Therefore, the argon gas sample will reach a pressure of 2.83 atm at 43°C.
Let me know if you have any other questions!
True or false? A metal will always be produced at one electrode during electrolysis.
Yes, a metal will always be produced at one electrode during electrolysis.
What is electrode?
An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit.
An electrode can be anode or cathode. During electrolysis, that is , the decomposition of a chemical compound by electricity, a metal will be deposited at the cathode.
Thus, a metal will always be produced at one electrode during electrolysis.
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Answer: FALSE
Explanation: Often, gases rather than metals form at electrodes, especially if it involves the electrolysis of a solution.
What is the yield of uranium from 2.50 kg U3O8?
Answer: Thus the yield of uranium from 2.50 kg \(U_3O_8\) is 2.12 kg
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number \((6.023\times 10^{23})\) of particles.
To calculate the number of moles, we use the equation:
\(\text{Number of moles}=\frac{\text{Given mass}}{\text{molar mass}}\)
moles of \(U_3O_8=\frac{2.50\times 1000g}{842g/mol}=2.97mol\) (1kg=1000g)
As 1 mole of \(U_3O_8\) contains = 3 moles of U
2.97 mole of \(U_3O_8\) contains = \(\frac{3}{1}\times 2.97=8.91moles\) moles of U
Mass of Uranium=\(moles\times {\text {Molar mass}}=8.91mol\times 238g/mol=2120g=2.12kg\)
( 1kg=1000g)
Thus the yield of uranium from 2.50 kg \(U_3O_8\) is 2.12 kg
)
Kc=2.99×10−7 at 227 ∘C
You may want to reference (Page) Section 15.8 while completing this problem.
Part A
If a reaction mixture initially contains 0.177 MSO2Cl2 , what is the equilibrium concentration of Cl2 at 227 ∘C ?
The equilibrium concentration of chlorine gas Cl₂ is equal to 2.3 ×10⁻⁴ M.
What is equilibrium?The chemical equilibrium can be described as the state in which both the reactants and products are present in concentrations that have not further changed with time. The chemical reaction rates of the forward and backward reactions are not zero, but they are equal while in equilibrium.
The chemical equation of decomposition of SOCl₂:
SOCl₂ → SO₂ + Cl₂
The equilibrium constant of the given reaction is Kc = 2.99 ×10⁻⁷
SOCl₂ → SO₂ + Cl₂
intial 0.177 0 0
at time t -x +x +x
Equ. 0.177-x x x
The equilibrium constant Kc expression:
Kc = [SO₂] [Cl₂] / [SOCl₂]
2.99× 10⁻⁷ = x² / (0.177 - x)
2.99× 10⁻⁷ = x²/0.177
2.99× 10⁻⁷ × 0.177 = x²
√5.29× 10⁻⁸ = x
x = 2.3 ×10⁻⁴ M
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Date
Class
2.
B.
Note-taking Motion
Worksheet
Section 1
Describing Motion
A.
when an object changes its position relative to a reference point
1.
-how far an object has moved
starting point
-distance and direction of an object's change in position from the
distance an object travels per unit of time
1.
- any change over time
2. Calculation for speed: speed = distance !
3. Speed that doesn't change over time-
speed
4. Speed is usually not constant; usually an object has
speed.
5.
-speed of motion when speed is changing
speed = total
/ total travel time
I
speed at any given point in time
C. A distance-time displays motion of an object over time.
1. Plot distance on a(n)
axis.
2. Plot time on a(n) Page 1 avas1
6.
Explanation:
kk na please mark me has brainlist
element in period 2 with the smallest atomic radius?
1) halogen
2) a noble gas
3) An alkali metal
4) an alkaline earth metal
The element in period 2 with the smallest atomic radius is a noble gas. The atomic radius is the distance between the nucleus and the outermost electron shell of an atom.
As we move from left to right across period 2, the atomic radius decreases due to the increasing nuclear charge which attracts the electrons closer to the nucleus. However, the noble gases (helium, neon, argon, krypton, xenon, and radon) have completely filled valence shells and do not readily form chemical bonds with other elements. This results in a tightly packed electron cloud around the nucleus, leading to the smallest atomic radius in period 2. Alkali metals have a larger atomic radius than alkaline earth metals, while halogens have a larger atomic radius than the noble gases. In summary, the element in period 2 with the smallest atomic radius is a noble gas due to their completely filled valence shells and lack of chemical reactivity.
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The element in period 2 with the smallest atomic radius is a halogen.
The halogens are non-metallic and highly reactive elements. They are located to the right of the other nonmetals and to the left of the noble gases. Elements in the halogen group have seven electrons in their outer shells giving them many unique properties.
The halogens include the five elements fluorine, chlorine, bromine, iodine, and astatine.Ony chlorine and fluorine in the list are gaseous at room temperature.
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can you answer this?
Mass: 108g
volume:12cm to the third power (3)
Answer:
The density is 0.0625 g/cm³
Explanation:
In order to find the density, you have to use its formula, ρ = mass/volume. Then substitute the following values into the formula :
\(ρ = \frac{mass}{volume} \)
Let mass = 108g,
Let volume = (12³)cm³ = 1728cm³,
\(ρ = \frac{108}{1728} \)
\(ρ = \frac{1}{16} \)
\(ρ = 0.0625g / {cm}^{3} \)
C
Unit Test
Unit Test Review Active
G
If a person has the values for an object's density and volume, what value can be calculated?
the object's size
the object's mass
the shape the object forms in a container
the amount of space the object takes up
If a person has the values for an object's density and volume, they can calculate the object's mass. Hence option B) is correct.
If a person has the values for an object's density and volume, they can calculate the object's mass. Density is defined as the mass per unit volume of an object. Mathematically, density is calculated by dividing the mass of an object by its volume. Rearranging the equation, we find that mass is equal to the product of density and volume. Therefore, if the density and volume of an object are known, multiplying them together will yield the object's mass. The other options mentioned in the question are not directly calculated using density and volume. The object's size is a broader term that encompasses various dimensions and may not be specifically derived from density and volume alone. The shape the object forms in a container and the amount of space the object takes up are influenced by both the object's mass and its dimensions, which are not solely determined by density and volume. Therefore option B) is correct.
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18) What is the following number representing: 10m/s West *
3 points
Force
Acceleration
Mass
Area
Pressure
Velocity
Speed
Impulse
Momentum
Speed
Explanation:
The distance travelled by a body per unit time
7. A sample contains 9,000 particles of the original isotope for every 63,000 particles of the daughter
isotope. The half-life of the original isotope is 19 years. Find the age of the sample.
Explanation:
Half life= 19yrs
K= 0.693/19yr
K= 0.036
In Nt = - kt + ln No
ln 9000 = - 0.036(t) + ln 63000
9.105 = - 0.036t + 11.051
-0.036t = -1.946
t = 54.06years
A compound with an empirical formula of CH2O has a molar
mass of 60 g/mol. What is its molecular formula?
Answer:
c2h4o2
Explanation:
I am using my cell. This could take a bit
The Empical formula has a mass of
C 12
2H 2
O 16
total = 30
The molecular mass is given as 60 which is 2 times the empirical mass. Therefore multiply each element by 2 in the empirical formula.
You get C2H4O2
According to the Second Law of Thermodynamics, in order for a reaction to be spontaneous which value must increase?
A) ΔS surr
B) ΔS universe
C) ΔHrxn
D) ΔSsys
Ε) ΔΤ
Option (B) ΔS universe is correct .
According to the Second Law of Thermodynamics, for a reaction to be spontaneous, the value that must increase is B) ΔS universe (the change in entropy of the universe).
The Second Law of Thermodynamics states that the entropy of the universe tends to increase for spontaneous processes. The entropy change of the universe (ΔS universe) is the sum of the entropy change of the system (ΔS sys) and the entropy change of the surroundings (ΔS surr):
ΔS universe = ΔS sys + ΔS surr
The entropy change of the system (ΔS sys) can be positive or negative, depending on the nature of the reaction. However, for a spontaneous reaction, the entropy change of the universe (ΔS universe) must be positive.
When a reaction occurs spontaneously, it is often associated with an increase in the total entropy of the system and its surroundings. This means that both the system and the surroundings experience an increase in their respective entropy values, but the magnitude of the increase in the surroundings' entropy is typically greater. Therefore, the value that must increase for a spontaneous reaction according to the Second Law of Thermodynamics is ΔS universe.
According to the Second Law of Thermodynamics, for a reaction to be spontaneous, the entropy change of the universe (ΔS universe) must increase. This principle highlights the tendency of the universe to move towards higher entropy states during spontaneous processes. While the entropy change of the system (ΔS sys) can be positive or negative, it is the overall change in entropy of the universe that determines the spontaneity of a reaction.
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In a terrarium, the pincushion moss, the echeveria, and the moon cactus make up which of the following? Select all that apply. A. a population B. part of a community C. part of an ecosystem
The pincushion moss, the echeveria, and the moon cactus in a terrarium make up a community.
What is a community of organisms?A community of organisms refers to a group of organisms of different species which are found living together in the same habitat.
Populations of organisms of different species within the same habitat constitute a community.
The pincushion moss, the echeveria, and the moon cactus are all different species found within the same habitat, a terrarium.
Therefore, the different species of organisms in the terrarium make up a community.
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Answer: part of a community and part of an ecosystem
Explanation:
In an electrochemical cell, equilibrium is the point at which:
A. None of these
B. both electrodes have an equal number of electrons.
C. ion concentrations are no longer changing and the voltage is 0.
D. Equilibrium cannot be reached in a voltaic cell because electrons only flow in one direction.
Answer:
C. ion concentrations are no longer changing and the voltage is 0.
Explanation:
Electrochemical cells are a device that generates current from redox reactions. In the cell, the equilibrium is reached when the voltage drops to 0. Thus, option C is correct.
What is an electrochemical cell?An electrochemical cell is a voltaic device that uses chemical energy to generate electrical energy and vice versa. It is of two types electrolytic and galvanic cells depending on the energy it produces.
The electrochemical cell comprises two electrodes namely an anode and cathode, a salt bridge or the porous barrier, and an external connection.
The connection shows the voltage that indicates the equilibrium. When the current flow stops and the voltage reaches zero, the electrochemical cell is said to be in equilibrium.
Therefore, no change in the ionic concentrations and zero voltage indicates equilibrium.
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A 10-kg rock falls from a height of 8.0 m above the
ground. What is the potential energy of the rock?
A single atom of an element has 21 neutrons, 20 electrons, and 20 protons, which elementis it?
Answer:
Calcium
Explanation:
The number of protons is the atomic number of the element. Number 20 on the periodic table is Calcium.
Why calcium chloride a deliquescent salt is used as a desiccant? Explain.
Calcium chloride is commonly used as a desiccant, which is a substance used to remove moisture or humidity from the surrounding environment.
Here are some reasons calcium chloride works well as a desiccant:
Calcium chloride has hygroscopic properties, which means it has a significant attraction for water. It can draw moisture from the air and absorb it, turning it into a liquid solution. Due to this characteristic, calcium chloride is very successful at lowering the relative humidity of its surroundings.
High Capacity for Water Absorption: Calcium chloride has a high capacity for water absorption. Even in environments with high humidity levels, it can absorb moisture from the air. Calcium chloride easily absorbs water molecules when exposed to the atmosphere, effectively reducing the relative humidity of the immediate area.
Deliquescent Nature: Calcium chloride can absorb enough water to dissolve and produce a concentrated liquid solution since it is a deliquescent salt. It gradually dissolves and turns into a calcium chloride and water solution as it takes in moisture from the air. This characteristic enables calcium chloride to effectively remove moisture from the surroundings.
Versatility: Calcium chloride can be found in powder, flakes, or pellets, among other forms. Due to its adaptability, it can be utilized in a variety of situations where controlling moisture is essential, including drying procedures, the preservation of items, and the mitigation of moisture-related damage.
Simple Monitoring: As calcium chloride absorbs moisture, a visible physical change may occur. For instance, calcium chloride may transform from a solid to a liquid when it absorbs water to become liquid or wet and dissolve. It is simple to monitor the desiccant's efficacy and identify when it needs to be replaced or recharged thanks to this visual signal.
Calcium chloride is frequently used as a desiccant in a variety of industries, including manufacturing, storage, transportation, and construction, to control moisture levels and prevent damage brought on by excessive humidity. This is due to its hygroscopic properties, high water absorption capacity, and deliquescent nature.
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GIVING BRAINLIEST TO WHOEVER ANSWERS THIS!!
What is the density of rod D, in g/cm3 ? Mass is 15 grams and volume is 14 cm3.
A: 2.5 g/cm3
B: 1.4 g/cm3
C: 1.1 g/cm3
D: 0.94 g/cm3
Answer:
The answer is option CExplanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\ \)
From the question we have
\(density = \frac{15}{14} \\ =1.0714285 ...\)
We have the final answer as
1.1 g/cm³Hope this helps you
Picaridin is a chemical insect repellent. What type of organic compound is it?
Picaridin is an organic compound that belongs to the class of carboxylic acid amides. Specifically, it is classified as an amide derivative of piperidine. Its chemical structure is 1-piperidinecarboxylic acid 2-(2-hydroxyethyl)-1-methylpropyl ester.
Organic compounds are compounds primarily composed of carbon atoms bonded with other elements such as hydrogen, oxygen, nitrogen, and more. Picaridin contains carbon, hydrogen, oxygen, and nitrogen atoms in its structure, making it an organic compound.
The presence of the carboxylic acid functional group (-COOH) and the amide functional group (-CONH-) in picaridin's structure classifies it as an amide. The piperidine moiety refers to a six-membered ring containing five carbon atoms and one nitrogen atom.
Picaridin is commonly used as an effective insect repellent, serving as an alternative to other insect repellents like DEET. It is known for its ability to repel a variety of biting insects, including mosquitoes, ticks, and flies. Its organic nature and repellent properties make picaridin a valuable compound for personal protection against insect bites in various outdoor activities and regions where insect-borne diseases are a concern
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Picaridin is an organic compound that belongs to the class of carboxylic acid amides. Specifically, it is classified as an amide derivative of piperidine. Its chemical structure is 1-piperidinecarboxylic acid 2-(2-hydroxyethyl)-1-methylpropyl ester.
Organic compounds are compounds primarily composed of carbon atoms bonded with other elements such as hydrogen, oxygen, nitrogen, and more. Picaridin contains carbon, hydrogen, oxygen, and nitrogen atoms in its structure, making it an organic compound.
The presence of the carboxylic acid functional group (-COOH) and the amide functional group (-CONH-) in picaridin's structure classifies it as an amide. The piperidine moiety refers to a six-membered ring containing five carbon atoms and one nitrogen atom.
Picaridin is commonly used as an effective insect repellent, serving as an alternative to other insect repellents like DEET. It is known for its ability to repel a variety of biting insects, including mosquitoes, ticks, and flies. Its organic nature and repellent properties make picaridin a valuable compound for personal protection against insect bites in various outdoor activities and regions where insect-borne diseases are a concern
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Why does Radium have a lower ionization energy than Barium
Radium have a lower ionization energy than Barium because electrons are closer to the nucleus
What is ionization energy?
Ionization energy can be simply stated as a measurement of an atom's or ion's inclination to give up an electron or of how challenging it is to remove an electron from them. An electron is often lost when a chemical species is in its ground state.
The atom displays a smaller radius than anticipated and the s electrons are more challenging to expel because these electrons are located nearer the nucleus. The first ionization enthalpy of Radium is higher than that of Barium.
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Explain why most volcanoes occur at plate boundaries and which two types of boundaries are most common.
Please explain why your answer is correct
Most volcanoes occur at plate boundaries because the tectonic plates are moving away from one another and the Earth's crust is pulled apart to create a new pathway for rising hot magma to flow on to the surface while the two types of boundaries which are most common are:
Divergent plate boundaries.Convergent plate boundaries.What is a Volcano?This is referred to as a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
It occurs at the plate boundaries because Earth's crust is pulled apart to create a new pathway for rising hot magma to flow on to the surface and the types which are most common are divergent plate boundaries which includes two tectonic plates that are moving away from each other and convergent plate boundaries which involves two tectonic plates moving toward each other.
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WHICH LETTER GOES WITH EACH QUESTION
-
The different forms of a gene are each called an __________.
-
Traits are features that are coded for in _________ and can be inherited.
-
___________ developed principles of genetics by experimenting with pea plants.
-
The temperature in which an organism lives is an example of an __________ environmental influence.
-
The law of ___________ states that a parent can pass only one allele for each trait to its offspring.
-
The trait that only appears when both alleles are present is called __________.
-
A sequence of DNA that directs a cell to make a protein is a ________.
-
Millions of __________ have become extinct in the history of the Earth.
A.
allele
B.
segregation
C.
species
D.
gene
E.
recessive
F.
DNA
G.
Mendel
H.
dominant
I.
external
Outline an alternative method and name equipment you could use to collect gas and work out the
volume produced in a more accurate way.
The alternative method to collect the gas and measure the volume is by a gas syringe.
What is a gas syringe?
Gas syringe is an equipment used to pump or withdraw gas from a closed container and can measure the volume of the gas produced in any chemical reaction.
The volume of the gas produced can be measured by reading the measuring scale on the gas syringe when the plunger moves in a gas syringe.
Hence, gas syringe is an alternative method to collect and measure the volume of the gas in a chemical reaction.
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Which sentence is a scientific statement?
A.
There is a substance around us that cannot be detected.
B.
Kids should go to school for 12 years.
C.
Experimentation is the best way to obtain knowledge.
D.
Unicorns once existed on Earth.
E.
There are no living things on the Moon.
B. Kids should go to school for 12 years.
What is a scientific statement?Scientific statements are those statements that must be falsifiable which means that able to be proven false while on the other hand, tautology is a statement that is true. The sun revolves around the earth” is an example of scientific statement because this statement can be falsifiable in the light of evidences and researches. Hypothesis is a statement that may be true or false. We can verify it by doing experiments.
So we can conclude that option B is the sentence that represents a scientific statement.
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