Answer:4
Explanation:
how to scientists know where to put electrons in the atom
a. probability
b. ratio and proportions
c. algebra
d. geometry
Answer:
a).
Explanation:
precise electron locations cannot be calculated, only predicted based on previous calculations. they cannot know whether or not an electron will be or will not be somewhere specific
have a nice day!
only_________are involved in forming chemical bonds betwen two atoms
a. s orbital electrons
b. p orbital electrons
c. valence electrons
d. innermost electrons
Answer:
c. valence electrons
Explanation:
Why are plastics known as synthetic materials?
Answer:
It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible.
Explanation:
Synthetic polymers are made up of long chains of atoms, arranged in repeating units, often much longer than those found in nature. It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible. In other words, it's what makes them so plastic.
Why do planets orbit faster as they get closer to the Sun?
The orbit becomes smaller closer to the Sun.
The orbit becomes smaller closer to the Sun.
The eccentricity changes as the planet gets closer to the Sun.
The eccentricity changes as the planet gets closer to the Sun.
The force of gravity increases closer to the Sun.
The force of gravity increases closer to the Sun.
The Sun's magnetism causes a "sling shot" effect.
Explanation:
The speed at which a planet orbits the Sun changes depending upon how far it is from the Sun. When a planet is closer to the Sun the Sun’s gravitational pull is stronger, so the planet moves faster. When a planet is further away from the sun the Sun’s gravitational pull is weaker, so the planet moves slower in its orbit.
which is more soluble in an acidic solution than in pure water?
Answer:
the anion of a salt is able to react with a H+ ion to form a weak acid, it can be removed from the solution by adding an acid. For CuBr adding H+ forms HBr and that is a weak acid; therefore, CuBr is more soluble in acid than in water:
use of chemical substance in our daily life their advantages and disadvantages
Answer:
Explanation:
By observing chemical reactions, we are able to understand and explain how the natural world works. Chemical reactions turn food into fuel for your body, make fireworks explode, cause food to change when it is cooked, make soap remove grime, and much more.
Por que los egipcios podrían haber construido pirámides?
Which of the substances shown below most likely exhibit hydrogen bonding with other identical
molecules? Check all that apply.
H
Н
Н.
Н
Н
H
H
но
N-C-C
Hн 0-Н
Н
Н
H
Н
H
DONE
Intro
TE
Answer:
b and c
Explanation:
did it on edge
plz help fast lot of points.
Answer:
The one at the top: cuticle
The highest line on the right side: palisade layer
The third line on the left: chloroplast
The line near phloem: vein
The line at the bottom: stomata
Entirely on the attachment.
Explanation:
No need.
which is the largest atom in group IV?
Answer:
A
Explanation:
god loves you
why is each individual produced by sexual reproduction unique?
Answer:
During sexual reproduction the genetic material of two individuals is combined to produce genetically diverse offspring that differ from their parents. The genetic diversity of sexually produced offspring is thought to give species a better chance of surviving in an unpredictable or changing environment.
Elements in which the d-sublevel is being filled have the properties of
Answer:
Elements in which the d-sublevel is being filled have the properties of metals
Elements in which the d-sublevel is being filled have the properties of;
transition metals.
In quantum theory the sublevel is an energy level. Now, the d-sublevel in atomic configuration has 5 orbitals and as such can contain a maximum of 10 electrons.
Now, this d-sublevel is used primarily by elements called "transition elements" as they are also called d-block elements.
However, these transition elements are also called transition metals because all the transition elements possess properties of metals generally.
In conclusion, elements in which the d-sublevel is being filled have the properties of transition metals.
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1. Ethanol has a density of 0.800 g/mL.
What is the mass of 225 mL of ethanol?
Since the ethanol has a density of 0.800 g/mL, the mass of the ethanol is 180 grams.
Given the following data:
Volume of ethanol = 225 mL
Density of lead ball = 0.800 g/mL.
To find the mass of the ethanol;
Density can be defined as mass all over the volume of an object.
Mathematically, the density of a substance is given by the formula;
Density = Mass/Volume
Making mass the subject of formula, we have;
Mass = Density x Volume
Substituting the given parameters into the formula, we have;
Mass of ethanol = 180 grams.
what minimum frequency of light is required to ionize boron?
Answer:
frequency = 8.22 x 10¹⁴ s⁻¹
Explanation:
An electron's positional potential energy while in a given principle quantum energy level is given by Eₙ = - A/n² and A = constant = 2.18 x 10⁻¹⁸j. So to remove an electron from the valence level of Boron (₅B), energy need be added to promote the electron from n = 2 to n = ∞. That is, ΔE(ionization) = E(n=∞) - E(n=2) = (-A/(∞)²) - (-A/(2)²) = [2.18 x 10⁻¹⁸j/4] joules = 5.45 x 10⁻¹⁹ joules.
The frequency (f) of the wave ionization energy can then be determined from the expression ΔE(izn) = h·f; h = Planck's Constant = 6.63 x 10⁻³⁴j·s. That is:
ΔE(izn) = h·f => f = ΔE(izn)/h = 5.45 x 10⁻¹⁹ j/6.63 x 10⁻³⁴ j·s = 8.22 x 10¹⁴ s⁻¹
If a tissue needs its cells to communicate regularly, then ______ will be most prevalent [occur most often)
O desmosomic junctions
O tight junctions
O gap junctions
O con junctions
There are many different ways that cells can connect to each other. The three main ways for cells to connect with each other are: gap junctions, tight junctions, and desmosomes. These types of junctions have different purposes, and are found in different places.
Using the formula velocity = distance/time, how fast does sound travel in air at 20 degrees C given a distance of 500 m and 3.92 seconds.
A- 3.92
B- 127 m/s
C- 2,941 m/s
D- 746 m/s
Answer:
B : 127m/s
Explanation:
= 500 ÷ 3.92
= 127.5
If you were to mass the reactants before a reaction and then mass the products after the reaction what would you expect to find and why?
pls answer fast ill give brainliest!
Answer:
No change...
Explanation:
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
Mark as Brainliest please...
CHEMMMMMMMMM HELPPPPPP PLEASEEEE
Answer:
: \large \boldsymbol {\rm x > 5 \ or \ x\in (5\ ; \ \infty ) }x>5 or x∈(5 ; ∞)
Step-by-step explanation:
\begin{gathered}\large \boldsymbol {} \displaystyle -2(3x+2) > -8x+6 \\\\ -6x-4 > -8x+6 \\\\ 8x-6x=6+4 \\\\ 2x > 10 \\\\ x > 5 \ or \ x\in (5\ ; \ \infty )\end{gathered}
−2(3x+2)>−8x+6
−6x−4>−8x+6
8x−6x=6+4
2x>10
x>5 or x∈(5 ; ∞)
A container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that
can kill someone in minutes. How many molecules is this?
A container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone in minutes molecules are 9.03 × 10 ²³ molecules.
What are moles?Moles are the smallest unit of a molecule that participates in the formation of the molecules to compete in a reaction and the value will be equal to the Avogadro number 2.303 × 10 ²³.
To calculate the total number of molecules the value of one mole is 2.303 × 10 ²³. so, for 1.50 moles of hydrofluoric acid will be,
1.50 moles = 2.303 × 10 ²³.moles
hydrofluoric acid molecules = 1.50 × 2.303 × 10 ²³
hydrofluoric acid molecules = 9.03 × 10 ²³ molecules.
Therefore, 9.03 × 10 ²³ molecules are present in the container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone.
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6. Haydee prepared a solution with 3mL of potassium chloride (KCl) in 200 mL of water is prepared. Calculate the percent by volume concentration of the solution.
A. 1.46% B.1.48 %
C. 1.49 % D. 1.50%
Considering the definition of percent by volume concentration, the correct answer is option D: the percent by volume concentration of the solution is 1.50%
Percent by volume concentration is a measure of concentration that indicates the volume of solute per 100 volume units of the solution. This value is calculated by dividing the volume of the solute by the total volume of the solution, and multiplying by 100 to express it as a percentage:
[tex]percent by volume concentration=\frac{volume of solute}{total volume of the solution}x100[/tex]
In this case, you know:
volume of solute= 3 mLtotal volume of the solution= 200 mLReplacing in the definition of percent by volume concentration:
[tex]percent by volume concentration=\frac{3 mL}{200 mL}x100[/tex]
Solving:
percent by volume concentration=0.015×100
percent by volume concentration=1.50
Finally, the correct answer is option D: the percent by volume concentration of the solution is 1.50%
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Someone pls help me I will make you brain
Match them pls
Answer:
Explanation:
Carbon monoxide → Prevents oxygen from being transported in the body
Nitrogen oxides → Can cause asthma
Particulate matter → Irritates lungs, dizziness, seizures, or death
Sulfur oxides → Inflammation and irritation of the respiratory system
I hope this helps!
Select the part that contains the information that a plant cell uses for growth and activities.
a. golgi b. vacuole c. chromosomes d. chloroplasts
The part that contains the information that a plant cell uses for growth and activities is known as Chromosome. Thus, the correct option for this question is C.
What are Chromosomes?Chromosomes may be defined as thread-like structures that appear during cell division. These structures are present in the nucleus of the cell and are made up of DNA, RNA, histones, and some non-histone proteins.
Chromosomes were first discovered by E. Strasburger in 1875. But the term chromosome was given by Waldeyer in 1888. Ultimately, the nucleus of the cell contains all sorts of genetic information which are essential for the growth and activities of organisms.
The Nucleus contains DNA which is known as the genetic material of most organisms including plants.
Therefore, a chromosome is a part that contains the information that a plant cell uses for growth and activities. Thus, the correct option for this question is C.
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(NEED ANSWER NOW)
Redshift is observed when:(1 point)
A. a luminous object is stationary relative to an observer.
B. a luminous object is traveling alongside an observer.
C. a distant luminous object travels rapidly towards an observer.
D. a distant luminous object travels rapidly away from an observer.
Answer:it’s C
Explanation:
A distant luminous object travels rapidly away from an observer.
Redshift is observed when a distant luminous object travels rapidly towards an observer. Thus option C is correct.
What is luminous object?Luminous object is defined as the sun is an example of a luminous object, whereas a non-luminous object is one that cannot create light.
It is also defined as objects that can generate their own light energy.
Non luminous object is defined as one that does not generate its own light but can reflect light from other sources.
It can also defined as object which do not generate their own light.
Redshift is defined as when the wavelength of the light is extended, it seems to be shifted towards the red section of the spectrum.
Thus, redshift is observed when a distant luminous object travels rapidly towards an observer. Thus option C is correct.
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Predict what would happen if plants disappear?
Decomposers will die because they will lose their food source.
All secondary consumers will die because they will lose their food source.
Oxygen will only be available during the daytime.
There will be a limited amount of oxygen in the air.
Answer:
All secondary consumers will die because they will lose their food source
Beth measured her brand new figurine to be
17.550 cm tall. However, the manufacturer
claims that it is 17.260 cm tall. What is the
percent error in Beth's measurement?
A 1.68%
B
1.65%
Answer: A
Explanation: I just answered mine
What is a paper clip, a colloid? solution? or a suspension?
Answer:
I'm gonna guess it's a suspension
Explanation:
let me know if I'm wrong
what process in the natural world converts radiant energy into chemical energy?
Answer:
Photosynthesis
Explanation:
Photosynthesis is the process in which plants collect radiant energy (from the Sun) and transform it into chemical energy.
Answer:
Photosynthesis is the process in which plants collect radiant energy (from the Sun) and transform it into chemical energy.
Explanation:
BECAUSE I SAID, btw its right i promise
3. Write balanced ionic equations to show the dissolution of the following compounds in water: a) magnesium chloride
Answer:
MgCl2 + H2O
Explanation:
A mixture of neon and argon gases exerts a total pressure of 2.39 atm. The partial pressure of the neon alone is 1.84 atm, What is the partial pressure of the argon?
Answer:
0.55 atm
Explanation:
According to Dalton's law of partial pressures,
The total pressure is the summation of the partial pressures of individual gases in a sample of non-reactive gases.
Since Neon and Argon are noble gases, they do not react with each other. So we can apply Dalton's partial pressure law.
P total = P Ar + P Ne
2.39 atm = P Ar+ 1.84 atm
P Ar = 2.39 atm - 1.84 atm
= 0.55 atm
According to the Dalton's law of partial pressure the partial pressure of the argon is 0.55 atm.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
In this case, pressure of gas argon is obtained by subtracting pressure of gas neon from the total pressure ,that is 2.39-1.84=0.55 atmosphere.
Thus ,the partial pressure of gas argon in atmosphere is 0.55 atmosphere.
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