Answers
Answer:
c
Explanation:
ok than not c than b maybe
Related Questions
Reflect on the learning activities titled “Hypothesis”, “Variables and Hypothesis” and “Constructing a Hypothesis”. Describe some similarities and differences between a question that comes in response to an observation, and a scientific research question? Cite quotes from the readings to support your answer. Where do variables fit into this thinking? In other words, if you imagine a number line with observation questions at one end and scientific research questions at the other, what role do variables play anywhere along this continuum?
Answers
The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.
The following quotes from the readings illustrate this distinction:"A scientific question is one that can be answered by using scientific investigation. In contrast, an observation question is one that comes in response to observing or experiencing something in the natural world" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."An important feature of a scientific question is that it should be answerable within a reasonable amount of time and with the resources available" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Research questions can be narrow or broad, depending on the scope of the research" (Constructing a Hypothesis).The concept of variables is crucial to both observation and scientific research questions, but they play different roles depending on where they fall on the continuum. Observation questions are usually less precise and may not require much consideration of variables. On the other hand, scientific research questions are likely to include a rigorous examination of variables and their potential effects."Variables are an essential part of a scientific experiment. They are the things that change in an experiment" (Scientific Inquiry: Variables, Hypotheses, and the Scientific Method)."Variables are important because they can affect the outcome of the research" (Constructing a Hypothesis).In summary, observation questions and scientific research questions share some similarities, but the latter is more specific, has a defined methodology, and may require more consideration of variables.For such more question on Hypothesis
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URGENT HELP!!!!
Which of the following experimental plans will test the effects of pressure on a reaction with gases and what is
the expected result?
A Keep temperature constant and increase the pressure of the reaction; reaction rate will increase.
B Keep pressure constant and increase the temperature of the reaction; reaction rate will decrease.
C Keep temperature constant and decrease the pressure of the reaction; reaction rate will increase.
D Keep pressure constant and decrease the temperature of the reaction; reaction rate will increase.
Answers
A) Keep temperature constant and increase the pressure of the reaction; reaction rate will increase.
Explanation:The temperature and pressure of a reaction will affect the rate of reaction.
Pressure
Pressure and the rate of reaction have a direct relationship. This means that as one increases, so does the other. So, if the pressure increases. then the rate of reaction will also increase. This is due to the number of collisions. As pressure increases, the number of collisions between molecules increases. This causes the reaction to occur faster. Thus, the rate of reaction increases.
Temperature
Kinetic energy and temperature are proportional. This means that as temperature increases, so does kinetic energy. This leads to temperature and rate of reaction also having a direct relationship. So, temperature and rate of reaction increase and decrease together. This is due to the fact that when temperature increases, the energy of the molecules increases. This leads to an increased number of collisions. As stated above, more collisions lead to a faster reaction.
Methyl orange can change color by transitioning from one chromophore to another. When added to a clear solution and the solution turns red, it is determined to be a(n) __________ in its __________ stable form.
Answers
Answer:
acidic titration in its stable form
Explanation:
Methyl orange can change its color in titration solution. The yellow color is towards alkaline solution and red color is towards acidic solution. The Ph value of solution will change during this chemical process.
4. What is the difference between an open system and a
closed system?
Answers
Systems can exist in three ways as open systems, closed systems, and isolated systems. The main difference between open and closed system is that in an open system, matter can be exchanged with the surrounding whereas, in a closed system, matter cannot be exchanged with the surrounding.
btw why not just look it up on google? btw btw brainliest plz
What is the ability to do work defined as?
OA. pressure
OB. energy
Ос.
force
OD
temperature
R
Answers
Answer:
It would be B
Explanation:
When an unbalanced force acts on an object, the change in the object's _______ or _______ depends on the size and direction of the force.
Answers
How many moles of KBr are dissolved in 60.2 mL of a 3.50 M solution?
Answers
There are 0.2107 moles of KBr are dissolved in 60.2 mL of a 3.50 M solution.
The molarity of a substance is defined as the number of moles of solute present in 1 litre of a solution.
According to the given data, the molarity of the solution tells us that there are 3.50 moles of KBr in 1000mL of solution. But we only have 60.2mL of solution, so with a mathematical rule of three we can calculate the amount of moles in 60.2mL:
1000 ml - 3.50 moles
60.2 ml -x = 60.2 ml× 3.50 moles/1000 ml
x= 60.2 ml -0.2107 moles
So, there are 0.2107 moles of KBr.
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The reaction of 6.20 g of carbon with excess O2 yields 8.35 g of CO2. What is the percent yield of this reaction?
Answers
The theoretical yield of the reaction between 6.20 g of carbon with excess oxygen is 22.7 g. The actual yield is given 8.35 g. Thus, the percent yield is 36.7 %.
What is percent yield?Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.
One mole or 12 g of C gives one mole of carbon dioxide. Molar mass of CO₂ is 44 g/mol. Thus, the mass of carbon dioxide that can be produced from 6.20 g of C is :
= (6.20 × 44 ) / 12 g = 22.73 g.
The actual yield of CO₂ is 8.35g only. Thus, its percent yield is calculated as :
percent yield = 8.35 g/ 22.73 g × 100 = 36.7 %.
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volume reading
final: 28.5 mL
start: 7.5 mL
Total Volume: 21 mL
What is the Molarity of vinegar?
Based off the work information provided
Answers
The molarity of vinegar is 0.47368421 moles per liter.
To calculate this, we can use the following formula:
molarity = (initial_volume - total_volume_change) / final_volume
In this case, the initial volume is 7.5 mL, the total volume change is 21 mL, and the final volume is 28.5 mL. Plugging these values into the formula, we get:
molarity = (7.5 - 21) / 28.5 = -0.47368421
The negative value for molarity indicates that the solution is diluted. This is because the total volume of the solution increased by 21 mL, while the amount of solute (acetic acid) remained the same.
It is important to note that the molarity of a solution can change depending on the temperature. This is because the volume of a solution expands as it gets warmer. Therefore, it is important to measure the volume and temperature of a solution at the same time to get an accurate measurement of its molarity.
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uses of carbon dioxide.
Answers
Answer:
hello can you follow me
Explanation:
used in fire extinction, blasting rubber, foaming rubber and plastic
4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
Answers
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
Emission ReductionAir Quality RegulationsLearn more about air on https://brainly.com/question/15215203
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Explain why the chemical properties of Mg 24 12 and Mg 26 12 are the same
Answers
what pressure would 1.75 L of disulfur monoxide gas have if it occupied a volume of 16.60 L at 1 atm?
Answers
Okay, let's solve this step-by-step:
* We are given that the initial volume of the gas is 1.75 L at 1 atm pressure
* We want to know the pressure if the volume increases to 16.60 L
* According to Boyle's Law: Pressure x Volume = Constant
* Since the initial pressure is 1 atm and volume is 1.75 L, the constant is:
1 atm x 1.75 L = 1.75 atm*L
* When the volume increases to 16.60 L, plugging into Boyle's Law:
P x 16.60 L = 1.75 atm*L
* Solving for P (pressure):
P = 1.75 atm*L / 16.60 L
P = 0.105 atm
Therefore, the pressure of the 1.75 L of disulfur monoxide gas if it occupied a volume of 16.60 L would be 0.105 atm.
A sample of hydrogen gas occupies a volume of 300 ml at 1.2 bar pressure and 25 degree C. Calculate its volume at 0.45 bar pressure and 700 C
Answers
Answer
2612 mL
Explanation
Given:
The initial volume, V₁ = 300 mL
The initial pressure, P₁ = 1.2 bar
The initial temperature, T₁ = 25⁰C = (25⁰C + 273) = 298 K
The final pressure, P₂ = 0.45 bar
The final temperature, T₂ = 700⁰C = (700⁰C + 273) = 973 K
What to find:
The final volume, V₂ of the gas at 0.45 bar pressure and 700⁰C.
Step-by-step solution:
The question is a volume, pressure, and temperature relationship.
The final volume, V₂ of the gas at 0.45 bar pressure and 700⁰C can be calculated using the Combine gas law equation.
\(\begin{gathered} \frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} \\ \\ V_2=\frac{P_1V_1T_2}{T_1P_2} \end{gathered}\)Substituting the values of the parameters into the formula
\(\begin{gathered} V_2=\frac{1.2\text{ }bar\times300\text{ }mL\times973\text{ }K}{298\text{ }K\times0.45\text{ }bar} \\ \\ V_2=\frac{350280\text{ }mL}{134.1} \\ \\ V_2=2612\text{ }mL \end{gathered}\)Hence, the volume of the hydrogen gas sample at 0.45 bar pressure and 700⁰C is 2612 mL.
CAN SOMEONE HELP WITH THIS QUESTION?
Answers
The wavelength of light that should be employed for nickel(II) ion is roughly 400–500 nm, according to the absorbance spectra displayed. This is due to the graph's observation of an absorbance peak with a maximum of roughly 0.8 in this region.
The plot of a substance's absorbance as a function of light wavelength is called the absorbance spectrum. The absorbance spectrum in this instance is for the nickel(II) ion.
The peak in absorbance shows that the nickel(II) ion's electrons are most easily moved from a lower energy state to a higher energy one by this particular wavelength of light. As a result, more light is absorbed, increasing the measured absorbance.
Depending on the particular experiment and the tools being used, a specific wavelength of light should be employed. However, judging by the absorbance spectrum displayed, measuring nickel(II) ion absorbance should be possible at a wavelength of roughly 400–500 nm.
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What is the de Broglie wavelength of an electron traveling at 1.59×105m/s ?
Answers
The de Broglie wavelength of an electron traveling at 1.59×105m/s is 0.4547 x 10⁻⁹ m.
What is an electron ?The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically regarded to be elementary particles.
The length scale at which a particle's wave-like characteristics are significant is indicated by its de Broglie wavelength. The symbol or dB is typically used to indicate the De Broglie wavelength. The de Broglie wavelength for a particle with momentum p is given by dB = hp.
λ = h/mv
Where,
λ = wavelength of electron
m = mass of electron = 9.11e-31 kg
v = speed of electron = 1.59 × 10⁵ m/s
h = constant
Therefore,
λ = (6.626x10⁻³⁴J-s) ÷ [(9.11e-31 kg) (1.59 x 10⁵ m/s)]
λ = 0.4547 x 10⁻⁹ m
Thus, The de Broglie wavelength of an electron traveling at 1.59×105m/s is 0.4547 x 10⁻⁹ m.
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Coloumb's Law shows that opposite charges (positive and negative) attract
whereas charges that are both positive or both negative repel and a greater
distance decreases the force between objects. TRUE or FLASE
Answers
Explanation:
TRUE
the answer is true. Trust me. Im an expert at this.
Indicate the type of intermolecular forces hold liquid nitrogen (N2) together?
Answers
Answer:
Nitrogen liquefies at -195.8°C at room temperature.
At -182.95°C, the periodic table equivalent (oxygen) boils.
The boiling point of nitrogen is lower because there are fewer interactions between nitrogen molecules (N2).
The degree of electron fluctuation within a molecule affects interactions between non-polar molecules.
Van der Waals forces are the oldest sort of intermolecular contact, named after Dutch chemist Johannes van der Waals.
The Van der Waals forces, which include dipole-dipole and dispersion forces, are the weakest intermolecular forces.
Suppose a student repeats Experiment 1 using strontium instead of magnesium. The student adds 4.93 g of strontium to a crucible, heats the crucible and its contents for several minutes over a Bunsen burner, and records the final mass of the crucible and its contents.
Write the balanced chemical equation for this reaction. Include physical states.
balanced equation:
What mass of product is expected to form in this reaction? Assume all of the strontium reacts.
mass of product:
Answers
The balanced chemical equation for the reaction between strontium and oxygen can be written as follows: 2 Sr (s) + \(O_2\)(g) → 2 SrO (s).
In this equation, solid strontium (Sr) reacts with gaseous oxygen (\(O_2\)) to produce solid strontium oxide (SrO).
To determine the mass of product expected to form in this reaction, we need to consider the molar ratio between strontium and strontium oxide. From the balanced equation, we can see that 2 moles of strontium react to produce 2 moles of strontium oxide.
The molar mass of strontium (Sr) is 87.62 g/mol, and the molar mass of strontium oxide (SrO) is 119.62 g/mol. Since the molar ratio is 1:1 between strontium and strontium oxide, the mass of strontium oxide formed will be equal to the mass of strontium used.
In this case, the student added 4.93 g of strontium to the crucible. Therefore, the expected mass of strontium oxide formed will also be 4.93 g.
It's important to note that this calculation assumes that the reaction proceeds to completion, meaning that all of the strontium reacts with oxygen. In actual laboratory conditions, the yield of the reaction may be less than 100% due to factors such as incomplete reaction, side reactions, or product loss.
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Plz help me I Am timed plz
Which of the following is an example of a nonrenewable resource?
OA) water
OB) grass
C) soil
D) trees
Answers
Answer:
D) Trees
Explanation:
I'm sure its trees, because once you cut all trees you cant regenerate, or replenish them. hope im right, sorry of its wrong!!
which of these salts is more soluble? sodium chloride or calcium carbonate?
Answers
Answer:
Sodium Carbonate is more soluble.
Explanation:
chlorine take longer to dissolve
Answer:
Sodium Chloride
Explanation:
Sodium Chloride is salt and we can tell that salt is more soluble than calcium chloride as it is used for making cast for fractures
The tomato is dropped. What is the velocity, v
, of the tomato when it hits the ground? Assume 86.0 %
of the work done in Part A is transferred to kinetic energy, E
, by the time the tomato hits the ground.
Express your answer with the appropriate units.
Answers
To determine the tomato's velocity when it hits the ground, we need more information. Specifically, we need the height from which the tomato was dropped and the tomato mass.
Without these details, it is impossible to calculate velocity accurately. The velocity of an object when it hits the ground depends on factors such as the height of the fall, the mass of the object, and any forces acting on it during the fall (such as air resistance).
If you can provide the necessary information, I can help you calculate the velocity of the tomato when it hits the ground.
19. What is Beryllium's spin ?
Answers
Answer:
Nuclear properties
Naturally occurring beryllium, save for slight contamination by the cosmogenic radioisotopes, is isotopically pure beryllium-9, which has a nuclear spin of 3/2.Beryllium is alloyed with copper or nickel to make springs, gyroscopes, electrical contacts, spot-welding electrodes and non-sparking tools, according to the Royal Society of Chemistry. Other beryllium alloys are used in high-speed aircrafts and missiles, as well as spacecraft and communication satellites.
Explanation:
hope this helps if not let me know
A cake recipe calls for 170.0 mL of buttermilk. How many cups is this?
(1.0567 quart = 1
L and 4 cups =
1
quart
Answers
A cup is 240 ml and the cake recipe calls for 170.0 ml of milk. It's 2/4 of a cup.
How many mls are in a cup of tea?
the cups have a standard measure of 240ml, that is, if you buy one of these good quality utensils, even if in different places, the measure of 1 cup must always be equivalent to 240ml.
With this information, we can conclude that Ml is the abbreviation milliliter, the smallest unit of measurement for liquids. We start with the liter as the base unit, we must go down to one tenth of a liter, which is deciliter, then 100 tenths of a liter than the centiliter and we go up to one thousand tenths of a liter, which is milliliter. One liter contains one thousand milliliters.
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6. A box measures 11.25 inches in length, 8.1 inches in width and 6.85 inches in height. What is the
volume of the box?
Answers
Answer:
I'd say 624.2^3 inches.
Explanation:
trinitrotoluene [C6H2(NO2)2CH3], also known as TNT, is formed by reacting nitric acid (HNO3) with toluene (C6H5CH3):
HNO 3 + C 6H 5CH 3 → C 6H 2(NO 2) 2CH 3 + H 2O
Balance the equation and determine how many moles of TNT are produced when 4.903 mol of HNO3 reacts.
Answers
The balanced equation is: \(3HNO_3 + C_6H_5CH_3 -- > C_6H 2(NO_2)_2CH_3 + 3H_2O\)
The mole of TNT produced when 4.904 mol of \(HNO_3\) reacts would be 1.634 mol.
Stoichiometric ProblemThe problem is about simple mole ratios of reactants and products of reactions.
The unbalanced equation of the reaction goes thus:
\(HNO_3 + C_6H_5CH_3 -- > C_6H 2(NO_2)_2CH_3 + H_2O\)
The balanced equation of the reaction would be:
\(3HNO_3 + C_6H_5CH_3 -- > C_6H 2(NO_2)_2CH_3 + 3H_2O\)
In other words, the mole ratio of \(HNO_3\) that reacts and TNT that is produced is 3:1. For every 1 mole of \(HNO_3\) that reacts, 1/3 mole of TNT is produced.
Now, the amount of \(HNO_3\) that is being reacted is 4.903 mol. The equivalent amount of mole of TNT that will be produced can be calculated as:
1/3 x 4.903 = 1.634 mol
In other words, if 4.903 mol of \(HNO_3\) is reacted according to the equation above, 1.634 mol of TNT would be produced.
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Who always receives the H+
Answers
Answer:
In an acid-base reaction, the base always receives the H+.
Explanation:
In fall, leaves may change from green to yellow or red. Explain in your own words what is happening inside the leaf with regard to plant pigments.
Answers
Answer:
The pigment that causes leaves to be green is chlorophyll. ... As chlorophyll goes away, other pigments start to show their colors. This is why leaves turn yellow or red in fall. In fall, plants break down and reabsorb chlorophyll, letting the colors of other pigments show through.
Describe Muller's Ratchet.
Answers
Answer:
Muller's ratchet is a paradigmatic model in population genetics which describes the fixation of a deleterious mutation in a population of finite size due to an unfortunate stochastic fluctuation.
Explanation:
Answer:
Muller's ratchet is a paradigmatic model in population genetics which describes the fixation of a deleterious mutation in a population of finite size due to an unfortunate stochastic fluctuation.
Explanation:
This is the correct answer took a test and got this correct thank you to the original user above.
The scientific method is great, but how do you think we answer the questions which cannot be tested with an experiment?
Answers
Answer:
We do something called hypothesis
Answer:
1. Make an observation.
2. Ask a question.
3. Propose a hypothesis.
4. Make predictions.
5. Test the predictions.
6. Iterate.
and if it can't be trsted the you did something wrong
Explanation:
The scientific method
At the core of biology and other sciences lies a problem-solving approach called the scientific method. The scientific method has five basic steps, plus one feedback step:
Make an observation.
Ask a question.
Form a hypothesis, or testable explanation.
Make a prediction based on the hypothesis.
Test the prediction.
Iterate: use the results to make new hypotheses or predictions.
The scientific method is used in all sciences—including chemistry, physics, geology, and psychology. The scientists in these fields ask different questions and perform different tests. However, they use the same core approach to find answers that are logical and supported by evidence.
Scientific method example: Failure to toast
Let's build some intuition for the scientific method by applying its steps to a practical problem from everyday life.