The following are true about a theory;
New information and technology may be developed that influence the theory.New experimental methods provide new information.Theories may or may not be supported by new information.What is a theory?A theory is an explanation that is given to a phenomenon which may have some kind of underpinning reasoning that may not necessarily be empirical. Thus a theory has withstood some kind of scrutiny but is not yet absolutely accepted as true.
Thus the following are true about theory;
New information and technology may be developed that influence the theory.New experimental methods provide new information.Theories may or may not be supported by new information.Learn more about theory:https://brainly.com/question/1759635
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. Calculate the pH value of a solution in which [OH- ] = 1.49 × 10−8M
Answer:
The pH of the solution is 6.17.
Explanation:
To find the pH of the solution, we have to first calculate its pOH using the formula:
[tex]\boxed{\mathrm{pOH = - log_{10}[OH^-]}}[/tex]
Substituting the given value of [OH⁻] into the formula, we get:
[tex]\mathrm{pOH = -log_{10}(1.49 \times 10^{-8})}[/tex]
[tex]= \bf 7.83[/tex]
Now that we have the value of the pOH of the solution, we can find its pH using the following formula:
[tex]\boxed{\mathrm{pH + pOH = 14}}[/tex]
∴ [tex]\mathrm{pH} + 7.83 = 14[/tex]
⇒ [tex]\mathrm{pH } = 14 - 7.83[/tex]
⇒ [tex]\mathrm{pH } = \bf 6.17[/tex]
Polyethylene is a polymer that is flexible and often used to make clear plastic wrap. How can this
polymer be changed to make it less flexible, stronger, and harder? (1 point)
O Cross-linking the layers of polyethylene using covalent bonds.
O Adding larger carbon atoms in between the layers to make them more stable.
O Shortening the length, the polymer so that it cannot bend as much.
O Changing the covalent bonds to ionic bonds, which are stronger.
Polyethylene polymer can be changed to make it less flexible, stronger, and harder by: (a) Cross-linking the layers of polyethylene using covalent bonds.
Polyethylene is the polymer extensively used to make plastic products. It is light, versatile and flexible substance. It can be made more stiff by introducing covalent bonds to form the cross-links between the layers. The more will be the cross-links between the layers, reduced will be the length of the polymer and hence the stiffness is increased while reducing the flexibility.
Covalent bonds are the strongest type of bonds formed by the sharing of electrons between two or more atoms. The sharing is mutual between the atoms and they do not much electronegativity difference between them.
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how many molecules are there in 4.00 moles of carbon
with step-by-step please and thank you
Answer: 2.409 x [tex]10^{23}[/tex]
Explanation:
To find molecules, we multiply the number of moles by Avogadro's number over one mole of the element (in this case it is carbon).
[tex]4.00 C moles (\frac{6.022 x 10^{23}moleculesC }{1 C moles} )[/tex] = 2.409 x 10^23
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Answer:
Explanation:
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Inverse relationship
No relationship
Linear relationship
Define chemical reaction with examples
Answer:
A chemical reaction is a process where bonds are formed between reactant elements causing interaction hence products are formed.
The two types of chemical reaction:
[tex]{ \boxed{ { \rm{ \bold{ \dashrightarrow \: reversible \: reaction}}}}}[/tex]
This is a reaction where reactants interact chemically to form respective products and also products can react to reverse the reaction (to form reactants).
An example of reaction of hydrogen and oxygen:
[tex]{ \rm{2H_{2(aq)} +O_{2(aq)} \: {}{ ^{ \dashrightarrow}_{ \dashleftarrow} \: 2H _{2}O _{(l)} }}}[/tex]
[tex]{ \boxed{ \rm{ \bold{ \dashrightarrow irreversible \: reaction}}}}[/tex]
It is a one way reaction, cannot be reversed
[tex]{ \rm{Mg_{(s)} + N _{2(g) \: }\rightarrow \: \: Mg _{3} N _{2(s)} }}[/tex]
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What is the equation of the given line?
The equation of this straight line is equal to y = -1/2x + 1.
How to calculate the equation of the given line?First of all, we would determine the slope of the straight line by using this formula:
[tex]Slope,\;m = \frac{Change\;in\;y\;axis}{Change\;in\;x\;axis}\\\\Slope,\;m = \frac{y_2\;-\;y_1}{x_2\;-\;x_1}[/tex]
By critically observing the graph, the points on the x-axis and y-axis is given by:
Points (x₁, x₂) = (0, 2)
Points (y₁, y₂) = (1, 0)
Substituting the given points into the formula, we have;
Slope, m = (0 - 1)/(2 -0)
Slope, m = -1/2
In Mathematics, the y-intercept of any graph occurs at the point where the value of "x" is equal to zero (0).
y-intercept = (0, 1)
Mathematically, the standard form of the equation of a straight line is given by;
y = mx + c
Where:
x and y are the points.m is the slope.c is the intercept.Substituting the parameters into the formula, we have;
y = -1/2x + 1.
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Rutherford used a beam of alpha particles for his scattering experiment what is the de Broglie wavelength of an alpha particle moving at a velocity of 2.15×10^7 m per second
The wavelength of an electron moving with a velocity of 2.05×10^7 ms^−1 is 3.55×10^−11 m.
What is de Broglie wavelength ?
In accordance with wave-particle duality, all quantum mechanical objects exhibit the De Broglie wavelength, which establishes the probability density of discovering the object at a specific location in the configuration space.
The de-Broglie equation can be used to determine an electron's wavelength.
λ= h/mv
= 6.626×10^−34 Js / 9.11×10 ^−31 kg×2.05×10^7 m/s
=3.55×10^−11 m
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Question:
Calculate the wavelength of an electron moving with a velocity of 2.05×10^7 ms^−1.