Answer:
Scientific knowledge can change because it is often examined and re-examined by new investigations and scientific argumentation but because of these frequent examinations, scientific knowledge becomes stronger, leading to its durability. Scientific knowledge is durable and robust, but open to change.
The importance of scientific knowledge changing lies in the fact that it represents the evolving nature of science, allowing us to deepen our understanding of the natural world, undergo paradigm shifts, and build cumulatively on previous knowledge.
It is important that scientific knowledge changes because science is a continuous, self-correcting process that develops our understanding of the natural world. Paradigm shifts, such as those identified by Thomas Kuhn, indicate radical changes in scientific thought that enable fresh understandings and advancements. For instance, rather than discarding Gregor Mendel's laws of inheritance upon learning how genes control traits, scientists expanded the framework, illustrating that knowledge is cumulative and subject to refinement as new discoveries emerge.
Debate and skepticism are inherent aspects of the scientific method and are crucial for validating and improving upon established ideas. This democratic nature ensures that the best data and theories prevail. Consequently, scientific progress is advanced as new findings are built upon the foundations laid by past research, allowing us to develop a larger, more accurate picture of our world and universe.
Furthermore, recognizing that scientific models are mental constructs subject to change, empowers us to remain flexible and receptive to new evidence while appreciating that some scientific knowledge can stand the test of time, providing continuity amid change.
Which of the following is true for a reliable scientific source
Answer:
As the options for the question not given, lets try to answer this question generally.
Explanation:
A reliable source can be described as an authentic source which proves or declines an action, research etc.
The most reliable source for scientific information is scientific papers. This is because scientific papers are subjected to peer- review and hence been tested and validated. A peer-review can be described as a judgement or test made by a person on other peoples research, both of the people having equal caliber.
Answer:
It cites valid data because a reliable scientific source needs data to back up what they’re proving.
Explanation:
Which groups in the main group have a lower electronegativity than D block elements
Answer:
S-block
Explanation:
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus thus electronegativity increases.
As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
S-block is present on left side of periodic table while d-block is on the right side thus as we move from s to d block electronegativity increases,
Which is an intensive property of a substance?
density
volume
length
mass
Mark this and retum
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Answer:
Density.
Explanation:
That is density because it does not depend on the amount of the substance.
How many grams are in 1.3 decigrams?
Answer:
0.13 grams
Explanation:
This conversion of 1.3 decigrams to grams has been calculated by multiplying 1.3 decigrams by 0.1 and the result is 0.13 grams.
Answer:
0.13 GRAMS~
Explanation:
If an object has an acceleration of 9.8 m/s and a force of 58.8N what is the mass of an object ? What could the object be
Answer:
The mass of an object is 0.6122 Kg
Explanation:
Given:
Acceleration = 9.8 m/s
Force = 58.8 N
To Find:
Mass of an object = ?
Solution:
We know that according to newtons 2nd law
Force is the product of the mass and acceleration
F= ma
where
F = Force
m = mass
a = Acceleration
Substituting the values,
58.8 = m X 9.8
[tex]m= \frac{58.8}{9.8}[/tex]
m = 0.6122 kg
PLEASE ANSWER BEFORE JAN 1, 2020!!!
Which of the following statements correctly describes meiosis?
A. The cells produced at the end of meiosis are genetically identical to the parent cell.
B. Meiosis does not occur in reproductive cells.
C. The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell.
D. Cells divide only once during meiosis.
Answer: option C - The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell
Explanation:
Meiosis is also known as REDUCTIVE DIVISION, simply because a parent cell with diploid number of chromosome (46) is divided into four daughter cells with haploid number of chromosome (23)
Thus, ONLY option C correctly defines meiosis
At the end of meiosis, produced cells contain half the number of chromosomes as the parent cell. Option C is correct.
Meiosis:
It is division in which cell divide into 4 haploid daughter cells.
The daughter cells are haploid.Haploid means cell have half of number the chromosome of its parent.It is found in the germ cells to produce the sperm and ovum.Therefore, at the end of meiosis, produced cells contain half the number of chromosomes as the parent cell.
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what is the indication that tells us what charge a transitional metal has since they dont have a set trend
Answer:
Roman numbering in IUPAC naming system
Explanation:
This is quite an open question. Let's firstly separate the periodic table into two standard groups: group A elements and group B elements (transition metals).
The charge (or the oxidation state) of an element in group A can be identified by the group number. For example, group 1A elements would always have a charge of +1, as they have only one valence electron to lose.
Similar trend applies to group 2A: each element in that group would have a charge of +2, as each atom has 2 valence electrons to lose to become a cation.
You will notice that this is true fro group 3A and group 4A as well. Now, since an octet is the desired state for any species, starting with group 5A, it's easier to gain 3 electrons for species than lose 5 electrons to obtain an octer, meaning we'd expect -3 oxidation state for group 5A elements, -2 oxidation state for group 6A elements and -1 oxidation state for group 7A elements.
Notice that in the majority of cases, this is the standard trend and we'd generally only have one predominant oxidation state.
Considering group B, the transition metals, most of them have several oxidation states. That's why we usually memorize the ones which only have one oxidation state (such as zinc, silver) and in any other case when a transition metal has several oxidation states, they're identified in the name by using Roman numbering system.
Let's look at an example. Assume the problem states we have a salt which is iron chloride. This would be an improper name, as iron has two oxidation states: +2 and +3. That's why we have the rules of IUPAC naming to avoid ambiguity. If we had iron with an oxidation state of +2, we'd call the salt iron(II) chloride. An oxidation state of +3 would indicate iron(III) chloride.
To summarize, the main key of knowing the charge of a transition metal in a compound is to follow the IUPAC naming rules.
Andre wants to find the middle number in his data set. That means he is interested in finding the____.
A)Mean
B)Mode
C)Range
D)Median
The middle number in set is called median, D is the answer.
Hope this helps.
Science Chemical compound formula
Answer:
NaCl (common salt)
Explanation:
it is called sodium chloride
A chemical formula is a symbolic representation of a compound's composition. It uses element symbols and subscripts to denote the types of atoms present and their quantities. The formula H₂O represents water, while H₂SO₄ represents sulfuric acid, with N₂O₃ being the formula for dinitrogen trioxide.
A chemical formula represents a substance using symbols for its constituent elements and subscripts to show the number of atoms of each element in the compound. For example, the compound water has a chemical formula of H₂O, indicating it contains two hydrogen atoms and one oxygen atom. Another example is sulfuric acid, a widely produced chemical with a formula of H₂SO₄, showing it is composed of two hydrogen atoms, one sulfur atom, and four oxygen atoms. The naming convention for covalent compounds like dinitrogen trioxide involves using prefixes to denote the number of each type of atom present; thus, N₂O₃ denotes two nitrogen atoms and three oxygen atoms.
- What is the frequency of light whose waveler
wency of light whose wavelength is 633 nm? (1 m= 1 x 10 nm)
A
4.74 x 10-2 Hz
B
c
4.74 x 10-4 Hz
4.74 x 1014 Hz
D
4.74 x 1016 Hz
Answer:
Frequency = 4.74 × 10¹⁴ Hz
Explanation:
Given data:
Wavelength of light = 633 nm (633 ×10⁻⁹ m)
Frequency of light = ?
Solution:
Speed of light = wavelength × frequency
Frequency = Speed of light / wavelength
Speed of light = 3 × 10⁸ m/s
Frequency = 3 × 10⁸ m/s / 633 ×10⁻⁹ m
Frequency = 0.00474 × 10¹⁷ s⁻¹
Frequency = 4.74 × 10¹⁴s⁻¹
s⁻¹ = Hz
Frequency = 4.74 × 10¹⁴ Hz
The frequency of light with a wavelength of 633 nm is approximately 4.73 x 10^14 Hz. This is obtained by dividing the speed of light by the wavelength.
Explanation:The frequency of light can be determined using the equation for the speed of light, which states that the speed of light (c) is equal to its frequency (v) multiplied by its wavelength (λ). The formula is expressed as c = λv.
In this case, the speed of light is typically about 3.00 x 10^8 m/s, and the wavelength is given as 633 nm, which is equivalent to 633 x 10^-9 m.
The equation is rearranged to solve for frequency, thus becoming v = c / λ.
Using these values in the formula, we get frequency v as approximately 4.73 x 10^14 Hz. Hence, the correct answer is option (C).
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PLEASE HELP ASAP!! Needed IN 10 MINUTES!!
Which statement best describes how genetic information is passed to the offspring of Astrammina rara?
A. Half of the genetic information comes from one parent.
B. The genetic information comes from the egg.
C. All of the genetic information comes from one parent.
D. The genetic information comes from the sperm.
Answer:
The correct option is C) All of the genetic information comes from one parent.
Explanation:
The description in the paragraph tells that Astrammina rara are unicellular organisms and their offspring born are identical to the parent cell.
Asexual reproduction can be described as a method of reproduction in which a parent cells produces two offsprings which are identical to the parent cell. Asexual reproduction is the common mode of reproduction in unicellular organisms.
Hence, the description shows that Astrammina rara reproduce by this method and hence all of the information will arise from one, single parent.
Why does mixing reactants in different mole ratios affect the amount of the product and the amount of each reactant that is left over?
Answer:
Because of the reaction stoichiometry (detailed information given below).
Explanation:
Well, reaction stoichiometry determines relationships between reactants and products in a chemical reaction. For example, if the relationship between reactants and/or products is 1 to 1 (e.g. CO + H2O => CO2 + H2), the product is produced as much as the limiting reactant(s) (which is less than the other one in amount) consumed. For example, if 3 moles CO mixed with 0.5 moles of O2 (so O2 is limiting reactant in this case), 0.5 CO2 and 0.5 H2 are produced and 2.5 moles of CO and 0 moles of O2 (because all of O2 consumed) are left over. So, it can be concluded that the reaction stoichiometry has a direct relationship with the amount of the product and the amount of each reactant left over.
The amount of product and leftover reactants in a chemical reaction is determined by the mole ratios of the reactants, based on stoichiometry.
The amount of product and leftover reactants in a chemical reaction depend on the mole ratios of the reactants.
This concept is part of stoichiometry, which examines the numerical relationships between reactants and products in a balanced chemical equation.
Typically, one reactant will be completely consumed first, known as the limiting reactant, determining the amount of product formed, while the other reactants may be left over in varying amounts.
First, identify the balanced chemical equation for the reaction.Determine the mole ratios of the reactants to the products using the coefficients in the balanced equation.Identify the limiting reactant by comparing the initial amounts of reactants given and using the mole ratios.Calculate the expected amount of product formed based on the limiting reactant’s quantity.Determine the amount of any excess reactant by subtracting the amount that reacted from the initial amount.For example, in the reaction between hydrogen gas (H₂) and oxygen gas (O₂) to form water (H₂O), mixing 2 moles of H₂ with 1 mole of O₂ would use up all reactants perfectly, producing 2 moles of H₂O. However, if we mixed 3 moles of H₂ with 1 mole of O₂, H₂ would be in excess and only 2 moles of H₂ would react, leaving 1 mole of H₂ unreacted.
what happens to the properties of substances during a chemical reaction?
Explanation:
In a chemical reaction, only the atoms present in the reactants can end up in the products. Also, In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
let this be an easy 5 points to your brainly points all I ask is for you to answer with "thank you"
Answer:
1. Double displacement reaction
2. Trisodium phosphate and potassium hydroxide
3. Sodium hydroxide and Potassium phosphate
Explanation:
1)
The given chemical reaction is as follows.
[tex]Na_{3}PO_{4}+KOH\rightarrow NaOH+K_{3}PO_{4}[/tex]
The balanced chemical reaction is as follows.
[tex]Na_{3}PO_{4}+3KOH\rightarrow 3NaOH+K_{3}PO_{4}[/tex]
In the above reaction two reactants are exchange their cations. Therefore, it is a double displacement reaction.
2)
[tex]Na_{3}PO_{4}+3KOH\rightarrow 3NaOH+K_{3}PO_{4}[/tex]
In the above reaction left side of the reaction is considered as reactants.
[tex]Na_{3}PO_{4}[/tex] - Trisodium phosphate
[tex]KOH[/tex] - Potassium hydroxide
3)
[tex]Na_{3}PO_{4}+3KOH\rightarrow 3NaOH+K_{3}PO_{4}[/tex]
In the above reaction right side of the reaction is considered as products.
[tex]NaOH[/tex] - Sodium hydroxide
[tex]K_{3}PO_{4}[/tex] - Potassium phosphate.
Question is attached below!
Answer:
263 g
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created not destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
Thus in given example the mass of reactant is 263 g therefore the mass of product would be 263 g.
Another example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass
Bridges and automobiles are either painted or coated with zinc. Why is it not electroplated?
Final answer:
Zinc is used to protect bridges and automobiles from corrosion because it is more easily oxidized than iron, providing sacrificial protection. Electroplating is not commonly used because it results in a thinner and less durable zinc layer.
Explanation:
Zinc is often used to protect bridges and automobiles from corrosion because it is more easily oxidized than iron. This means that even if the zinc coating gets scratched, the zinc will still oxidize before the iron, providing a sacrificial protection. While electroplating could be an option, it is not commonly used because it results in a thinner and less durable zinc layer compared to other coating methods.
Select all the correct answers.
Sully works as a geologist in the southwestern United States. He plans to choose an unstable isotope to find the absolute age of a rock sample. Which two aspects must he consider before making his choice?
There should be a sufficient amount of the selected isotope in the rock.
The isotope should be one that decays at a very fast rate.
The isotope must not be found in any neighboring rocks.
The half-life of the isotope must be long enough to capture the age of the rock.
There should be more than one unstable isotope in the rock.
Answer:
1. There should be a sufficient amount of the selected isotope in the rock.
2. There should be more than one unstable isotope in the rock.
Explanation:
Use the proses of elimination!
Before choosing an unstable isotope, Sully must consider the half-life of the isotope, which must be long enough to capture the age of the rock, and the sufficiency of the amount of the chosen isotope present in the rock. The rate of decay, presence in neighboring rocks or existence of more unstable isotopes are not primary concerns.
Explanation:Sully, a geologist, should consider the following two aspects before choosing an unstable isotope for determining the absolute age of a rock sample. First, the isotope must have a long enough half-life to accurately capture the age of the rock. For example, if the rock is several million years old, the isotope chosen should have a half-life in that ballpark to provide effective dating. Second, there should be a sufficient amount of the chosen isotope present in the rock. The abundance of the isotope is crucial, as too small an amount may result in inaccurate dating. On the contrary, the isotope doesn't necessarily need to decay at a fast rate or be absent in neighboring rocks to produce accurate results. Also, having more than one unstable isotope in the rock isn't a mandatory requirement.
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How much of the moon is lit up as it makes its revolution around the Earth?
Only half of the moon is lit up as it makes its revolution around the earth.
Explanation:The surface of the moon reflects the light incident from the sun and that is what makes the moon bright and shiny. While making its revolution around the earth, whatever is its position in the trajectory, only half of its entire surface is facing the sun and thus only half of the moon is lit up; the other half is always on the shadow side.
What accounts for the differed brightness and shapes as observed from the earth is its position with respect to earth and the sun and this changes each day. When the sun, the earth and the moon all are in a straight line, the moon appears to be the brightest giving a Full moon and when it is between the sun and earth, the lit side is facing opposite to earth and thus it is not visible to us; giving rise to a New moon.
Which example best shows conservation of resources?
A. leaving the water running when brushing your teeth
B. using a disposable plastic bag every shopping trip
C. driving a gas-powered car when taking a short trip
D. recycling aluminum cans and glass bottles
Answer:
D.
Explanation:
I took this test as a freshman and this was the only question of 4 that I can remember
The example that best shows conservation of resources is recycling aluminum cans and glass bottles.
WHAT IS CONSERVATION?Conservation refers to the wise and judicious use of resources to make them available for future use.
Conservation of resources can include any way by which resources are not wasted or are utilized effectively.
One way in which conservation is achieved is recycling of use products. Therefore, the example that best shows conservation of resources is recycling aluminum cans and glass bottles.
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Why is photosynthesis a chemical reaction?
A because new substances are formed
B. because an input of energy is required
C. because the reactants are compounds
D. because the products include an element
Answer: A.
Explanation: A chemical reaction is a chemical change that occurs when two or more substances combine to form a new substance . Photosynthesis turns carbon dioxide and water into oxygen and carbohydrates, therefore a chemical change occurs.
Answer:
A. Because a new substance is formed.
1. If you run into a curb on a skateboard, you will fall forward off your skateboard because
there is an
force applied to your body.
a. unbalanced
b. balanced
c. net
d. applied
of an object changes
2. Acceleration is the rate at which the
a. distance
b. force
c. motion
d. velocity
Answer:
D)applied
Explanation:
Answer:
i think the answer is unbalanced
Explanation:
What is the difference in mass between 3.01×10^24 atoms of gold and a gold bar with the dimensions 6.00 cm X 4.25 cm X 2.00 cm
Answer:
The difference in mass between 3.01×10^24 atoms of gold and a gold bar with the dimensions 6.00 cm X 4.25 cm X 2.00 cm is :
Difference in mass = 985.32 - 984.5 = 0.82 g
Explanation:
Part I :
[tex]n =\frac{3.01\times 10^{24}}{6.022\times 10^{23}}[/tex]
n = 4.9983
n = 4.99 moles
(Note : You can also take n = 5 mole )
Molar mass of gold = 196.96 g/mole
This means, 1 mole of gold(Au) contain = 196.96 grams
So, 4.99 moles of gold contain = [tex]5\times 196.96[/tex] g
4.99 moles of gold contain = 984.8 g
Mass of [tex]{3.01\times 10^{24}}[/tex] atoms of gold = 984.5 g
Part II :
Density of Gold = [tex]19.32 g/cm^{3}[/tex]
Volume of the cuboid = [tex]length\times breadth\times height[/tex]
Volume of the gold bar =[tex]6.00\times 4.25\times 2.00[/tex]
Volume of the gold bar = 51[tex]cm^{3}[/tex]
Using formula,
[tex]Density = \frac{mass}{Volume}[/tex]
[tex]Mass = Density\times Volume[/tex]
[tex]Mass = 19.32 \times 51[/tex]
Mass = 985.32 g
So, A gold bar with the dimensions 6.00 cm X 4.25 cm X 2.00 cm has mass of 985.32 g
Difference in mass = 985.32 - 984.5 = 0.82 g
The kinetic energy within molecules of an object ________ when heat is added.
Answer:
Vibrates (combines)
Explanation: addition of heat to a particle causes the ions to become charged (energized) and this results to vibration and Interaction between the Molecules and the walls of the object
A small container of water boils at 100°C. The boiling point increases by 1°C for every 12 g of salt dissolved in the water. Determine the new boiling point of the water after 48 g of salt is dissolved into it
why does an ionic bond form between magnesium and oxygen?
Answer:
Mg loses two electrons to have an octet. Oxygen gains two electrons to have an octet. The ionic bond between ions results from the electrostatic attraction of opposite charges. The final formula of magnesium oxide is MgO.
Explanation:
if we view a 1st quarter moon tonight , how many weeks will pass before we view the next new moon?
Answer: We call it "first quarter" because the moon has traveled about a quarter of the way around Earth since the new moon. Waxing gibbous: The area of illumination continues to increase.
Explanation:
the middle of the day and sets around the middle of the night in most areas. In general, people see the First Quarter also A first quarter moon rises around noon and sets around midnight. You'll likely spot it in late afternoon or early evening, high up in the sky. At this moon phase, the moon is showing us precisely half of its lighted half.
in an experiment magnesium ribbon was heated in air the product formed was found heavier than original ribbon.potassium manganate(vii)was heated im air and product formed was found lighter.explain different observations made
Answer:
1: due to difference in reactivity and melting point
2 during the reaction both combine with oxygen in this case magnesium remain solid but some potassium vaporise
The burning of Magnesium ribbon in the air is a chemical change.
What are the observations made?Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray solid that shares many physical and chemical properties with the other five alkaline earth metals.Magnesium is a silvery-white metal.Magnesium burns in the air in the presence of oxygen in the form of Magnesium oxide.2Mg (s) + O2 (g) ⇒ 2MgO (s)
There is a direct combination reaction of two elements Mg and O2.Magnesium oxide (MgO) is basic in nature.Formation of MgO is a chemical change.To learn more about the Magnesium experiment, refer to: https://brainly.com/question/24160248
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Lamp, toaster, and a fan
Each device shown on this drawing is plugged into an electrical outlet. Each device converts this electricity into three different types of energy.
Question:
Identify and describe the energy transformations shown with each device in this drawing. Write a separate and complete sentence for each identified energy transformation.
Answer: Light, Thermal, Kinetic
Explanation:
The lamp converts the electric energy to light energy.
The toaster converts the electric energy to thermal energy.
The fan converts the electric energy to kinetic energy.
Good luck with your test!
Answer:
it is what every the one above said
Explanation:
Given the reactants of HNO3 + LiOH → predict the products *
Answer:
Lithium nitrate and water are product of given reaction.
Explanation:
Word equation:
Nitric acid + lithium hydroxide → Lithium nitrate + water
Chemical equation:
HNO₃ + LiOH → LiNO₃ + H₂O
The given reaction is balanced. There are two hydrogen, four oxygen, one lithium and one nitrogen atoms are present on both side of equation.
This reaction completely follow the law of conservation of mass.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
NaOH + H2CO3 → Na2CO3 + H2O
Balance Chemical Eguation
Answer:
2NaOH + H2CO3 —> Na2CO3 + 2H2O
Explanation:
To balance the equation NaOH + H₂CO₃ → Na₂CO₃ + H₂O, introduce a coefficient of 2 before NaOH and H2O resulting in the balanced chemical equation 2NaOH + H₂CO₃ → Na₂CO₃ + 2H₂O
To balance the chemical equation NaOH + H2CO3 → Na2CO3 + H2O, we need to ensure that the number of atoms of each element on the reactant side is equal to the number of atoms of that element on the product side. The original equation is already balanced with respect to carbon and oxygen, but not with sodium and hydrogen. By changing the coefficient for NaOH to 2, the equation becomes balanced for sodium. Hence, the balanced chemical equation is:
2NaOH + H₂CO₃ → Na₂CO₃ + H₂O
Now equation is imbalanced with oxygen and hydrogen. To balance the equation with respect to oxygen and hydrogen coefficient 2 is introduced before H2O. Hence, the balanced chemical equation is:
2NaOH + H₂CO₃ → Na₂CO₃ + 2H₂O
The final balanced chemical equation is 2NaOH + H₂CO₃ → Na₂CO₃ + 2H₂O