Answer:
1.0 × 10⁸ ruthenium atoms
Explanation:
Step 1: Calculate the diameter (d) of an atom of ruthenium
The diameter of an atom is twice its radius.
d = 2 × r = 2 x 178 pm = 356 pm
Step 2: Convert "d" to meters
We will use the conversion factor 1 m = 10¹² pm.
356 pm × 1 m/10¹² pm = 3.56 × 10⁻¹⁰ m
Step 3: Convert the distance of the tip of a finger (D) to meters
We will use the conversion factor 1 m = 10² cm.
3.6 cm × 1 m/10² cm = 0.036 m
Step 4: Calculate the number of atoms of ruthenium required
We will use the following expression.
D/d = 0.036 m/3.56 × 10⁻¹⁰ m = 1.0 × 10⁸
Which describes a difference between cephalopods and gastropods?
Cephalopods have a water vascular system, and gastropods have an open circulatory system.
Cephalopods live only in ocean environments, and gastropods live in a variety of environments.
Cephalopods have a simple nervous system, and gastropods have a complex nervous system.
Cephalopods are the largest group of mollusks, and gastropods are the smallest group of mollusks. CAN SOMEONE PLZZZZ ANWER THIS I WILL GIVE U 15 PIONTS
Answer:
B
Explanation:
I took the test
Answer:
The correct answer is B
Explanation:
What describes the relationship between elements and compounds?
Group of answer choices
A. Carbon changes to Oxygen to form a compound
B.A few elements can combine to form a compound
C. Carbon is always a part of a compound
D. A few compounds combine to form an element
Answer:
B. A few elements can combine to form a compound
Explanation:
An element is a substance that cannot be chemically broken down into simpler substances. (THESE ARE IN THE PERIODIC TABLE OF THE ELEMENTS)A compound is a substance composed of two or more elements in fixed, definite proportions.Source: Tro Nivaldo J.. Principles of Chemistry (p. G-4). Pearson Education. Kindle Edition.
Answer:
.A few elements can combine to form a compound
Explanation:
Electrons are one of the three subatomic particles that make up an atom. Which of the
following describes the location of electrons?
Electrons were held even outside the nucleus, unlike protons as well as neutrons.
What is electron?Subatomic particles with an elementary charge of -1 were classified as electrons.
What is nucleus?An atom's nucleus would be its center. The protons, as well as neutrons in the nucleus, as well as neutrons in the nucleus, make up several of an atom's mass while orbiting electrons contribute only a little amount.
Electrons were held even outside the nucleus, unlike protons as well as neutrons, which have been contained within the nucleus at the heart of the atom. Negative electrons were drawn to the positive nucleus by the attraction of opposite electric charges.
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Calculate the molar mass of pentacarbon disulfide.
Answer:
[tex]MM_{C_5S_2}=132.19g/mol[/tex]
Explanation:
Hello!
In this case, since the computation of the molar mass requires the molecular formula, we first realize that of pentacarbon disulfide is C₅S₂ due to the given prefixes. In such a way, we multiply the atomic mass of carbon by five and that of sulfur by two as shown below:
[tex]MM_{C_5S_2}=5m_C+2m_S[/tex]
Thus, we plug in the atomic masses given in the periodic table to obtain:
[tex]MM_{C_5S_2}=5*12.01+2*32.07\\\\MM_{C_5S_2}=132.19g/mol[/tex]
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If the theoretical yield of the reaction above corresponds to 99.2g and the actual yield was 60.9 g, calculate the percent yield.
Answer:
61.4 %
Explanation:
Let's consider a generic chemical reaction.
Reactants ⇒ Products
The theoretical yield is the maximum mass of product that theoretically can be obtained from the chemical reaction.
The actual yield is the mass of the product obtained from the reaction.
The percent yield is:
Percent yield = actual yield / theoretical yield × 100%
Percent yield = 60.9 g / 99.2 g × 100% = 61.4 %
Find the mass of an object that has a density of 1.5 g/cm3 and has a volume of 8cm3
Answer:
density= 1.5 g/cm3
volume= 8cm 3
mass = density×volume
mass= 1.5×8
= 12 g
The mass of an object will be "12 g". To understand the calculation check below.
Volume, Density and MassAccording to the question,
Density, d = 1.5 g/cm³
Volume, V = 8 cm³
We know the relation,
→ Mass = Density × Volume
or,
m = d × V
By substituting the values, we get
= 1.5 × 8
= 12 g
Thus the response above is correct.
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1
Which organelle is the site of photosynthesis? *
(15 Points)
A. chloroplast
B. mitochondrion
C. nucleus
O
D. ribosome
Answer:
A. Chloroplast
Explanation:
The liquid 1-decanethiol is insoluble in water. If approximately equal volumes of water and 1-decanethiol were mixed in a separatory funnel, would the water layer end up on the top or on the bottom
Answer:
1-decanethiol on top layer and water on the bottom layer.
Explanation:
Hello!
In this case, since long-chained alcohols have a predominant nonpolar section in the molecule, we understand they are largely insoluble in water, also because their densities tend to be less than that of the water, which means they act as a light phase and water the heavy phase.
In such a way, when mixing equal volumes of 1-decanethiol and water in a separatory funnel, a phase splitting is evidenced and the alcohol remains on the top layer because of its lower density.
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Briefly explain how will you describe which object is moving fast and which one is moving slow?
If an object is accelerating at a rate of 25 m/s2, how long (in seconds) will it take to reach a speed of 550 m/s? (Assume an initial velocity of zero.)
Answer:
22s
Explanation:
Given parameters:
Acceleration = 25m/s²
Final velocity = 550m/s
Initial velocity = 0m/s
Unknown:
Time taken = ?
Solution:
To solve this problem, we are going to use one of the motion equations:
v = u + at
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time taken
550 = 0 + 25 x t
550 = 25t
t = 22s
7.5 moles of nitrogen gas (N2) is formed in the following reaction. How many grams
of Ammonia (NH3) are formed?
3H2 + N2 + 2NH
Answer:
Mass = 255 g
Explanation:
Given data:
Number of moles of nitrogen = 7.5 mol
Mass of ammonia formed = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Now we will compare the moles of nitrogen and ammonia.
N₂ : NH₃
1 : 2
7.5 : 2/1×7.5 = 15
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 15 mol × 17 g/mol
Mass = 255 g
Clouds are formed from which of the following processes:
A.evaporation
B.condensation
C.precipitation
Answer: Condensation
Explanation: Condensation forms clouds when water vapor in the air cools down into water and crystals.
would the ph shift observed with the buffer hace been greater less or the same if 0.4 M buffer had been used instead of 0.2
Answer:
It will remain the same.
Explanation:
A buffer solution is a kind of solution that has resistance for changes in the pH of a solution. It is a solution of weak acid and conjugate base or it may be otherwise.
H^+ + A^- <====================> HA.
Buffer solution aids in stabilizing pH and an example of a buffer solution is the human blood.
The higher the concentration, the lower the ka and vice versa. Thus, when 0.4M is being used instead of 0.2M the pH will be the same because when dealing with buffer solution, it is all about the value of (salt) / (acid) rather than on the molarity of one specie alone.
A jar contains 0.29 kg of olives. How many grams of olives are in the jar?
1 kilogram = 1000 grams
0.29 kg = 290 grams.
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A jar contains 0.29 kg of olives. The quantity of olives in the jar is 290 grams.
What is the conversion factor?A conversion factor may be significantly defined as a process through which a number is utilized in order to change one or specific set of units to another with the help of mathematical operations like multiplication and division.
According to the question,
The number of olives in the jar = 0.29 kg.
Now, if you want to convert this set of units into grams, you must require simple calculations:
1 kilogram = 1000 grams.
0.29 kilograms = 0.29 × 1000 = 290 grams.
Therefore, a jar contains 0.29 kg of olives. The quantity of olives in the jar is 290 grams.
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You add 9.3 g of iron to 28.60 mL of water and observe that the volume of iron and water together is 29.78 mL . Calculate the density of iron.
Express your answer to two significant figures with the appropriate units.
Answer:
density = mass / volume
mass of iron = 9.3g
volume of iron = 29.78ml - 28.00ml = 1.78 ml
density of iron = 9.3 / 1.78 = 5.22471910112 = 5.0
Explanation:
How do index fossils help scientistsHow do index fossils help scientists?
They aid in the study of ranges of different organisms.
They advance understanding of the origin of life on Earth.
They aid in comparison of rock layers at distant locations.
They advance understanding of rock type at the time the organism lived.
Answer:
C: They aid in comparison of rock layers at distant locations.
Explanation:
Index fossils are simply fossils of organisms that existed over a wide area and for just a brief duration of time. These fossils help scientists to date rocks and even matching the layers.
Looking at the options, the correct one is Option C.
Answer:
C
Explanation:
EDGE 2022
A cylinder is filled with 10.0 L of gas and a piston is put into it. The initial pressure of the gas is measured to be 90.1 kPa .The piston is now pulled up, expanding the gas, until the gas has a final volume of 49.0 L. Calculate the final pressure of the gas. Round your answer to 3 significant digits.
Answer:
18.4 kPa
Explanation:
Step 1: Given data
Initial volume of the cylinder (V₁): 10.0 LInitial pressure of the gas (P₁): 90.1 kPaFinal volume of the cylinder (V₂): 49.0 LFinal pressure of the gas (P₂): ?Step 2: Calculate the final pressure of the gas
If we assume the gas behaves as an ideal gas, we can calculate its final volume using Boyle's law.
P₁ × V₁ = P₂ × V₂
P₂ = P₁ × V₁/V₂
P₂ = 90.1 kPa × 10.0 L/49.0 L
P₂ = 18.4 kPa
I NEED HELP WITH #3 pleaseeee
Answer:
energy level
sub energy level
electrons in the orbital
Explanation:
What is the volume of 67.1g of ethyl alcohol, which has a density of 0.79 g/mL?
Answer:
[tex]84.94\ \text{mL}[/tex]
Explanation:
[tex]m[/tex] = Mass of ethyl alcohol = [tex]67.1\ \text{g}[/tex]
[tex]\rho[/tex] = Density of ethyl alcohol = [tex]0.79\ \text{g/mL}[/tex]
[tex]V[/tex] = Volume of ethyl alcohol
Density is given by
[tex]\rho=\dfrac{m}{V}\\\Rightarrow V=\dfrac{m}{\rho}\\\Rightarrow V=\dfrac{67.1}{0.79}\\\Rightarrow V=84.94\ \text{mL}[/tex]
The volume of ethyl alcohol is [tex]84.94\ \text{mL}[/tex].
Calculate the density of an object that has a mass of 5.0g and a volume of 25.0mL?
Answer:
1/5g/ml
Explanation:
D=m/v
D=5.0/25
D=1/5g/ml
blants, water moves in a continuous column in direction. Both One direction, down only One direction, up only Any way it wants to move
Answer:
i like one direction
Explanation:
A 0.0300 mol sample of NO2(g) is placed in a rigid 1.00 L reaction vessel and allowed to reach equilibrium at a certain temperature. What is the value of Kc at this temperature if 0.00500 mol of N2O4(g) is present at equilibrium
Answer:
12.5
Explanation:
Step 1: Write the balanced equation
2 NO₂(g) ⇄ N₂O₄(g)
Since the reaction takes place in a 1.00 L vessel, the initial concentration of NO₂ is 0.0300 M and the concentration at equilibrium of N₂O₄ is 0.00500 M.
Step 2: Make an ICE chart
2 NO₂(g) ⇄ N₂O₄(g)
I 0.0300 0
C -2x +x
E 0.0300-2x x
Step 3: Find the value of x
Since [N₂O₄]eq = 0.00500 M, x = 0.00500
Step 4: Calculate the concentrations at equilibrium
[NO₂] = 0.0300-2(0.00500) = 0.0200 M
[N₂O₄] = 0.00500 M
Step 5: Calculate the concentration equilibrium constant (Kc)
Kc = [N₂O₄]/[NO₂]²
Kc = 0.00500/0.0200²
Kc = 12.5
The recommended single dose for acetaminophen is 10.0 to 15.0 mg/kg of body weight for adults. Using this guideline, calculate the maximum single dosage for a person who weighs 153 lb .
Answer:
1.041g is the maximum sigle dose for the person
Explanation:
The maximum dose for acetaminophen is 15.0mg / kg of body weight for adults
To find the maximum single dosage for a person who weighs 153lb we must convert the lb to kg (1lb = 0.4536kg):
153lb * (0.4536kg / 1lb) = 69.4kg is the mass of the person
As the maximum dose is 15.0mg / kg, the dose of the person is:
69.4kg * (15.0mg acetaminophen / kg) =
1041mg = 1.041g is the maximum sigle dose for the personWhich is an example of a solution?
Answer: Examples:: Rubbing Alcohol, Dissolved Sugar in Water
Explanation:
A solution is a homogeneous mixture made up of two or more substances.
KOH + HNO3 equals HOH + KNO what type of reaction is this
Answer:
Double-Replacement Reactions
Explanation:
KOH + HNO3 -> H2O + KNO3
This is a double replacement reaction
The anions are "traded" and two new compounds are produced
(a liquid and a salt)
The height of three peaks; A, B, and C obtained in a gas chromatogram are 25.1 mm, 14.5 mm and 37.1 mm. The width of the peaks, at half height, are 4.6 mm, 4.4 mm and 5.9 mm, respectively. Calculate the percentage composition of A in the sample.
Answer: Percentage Compositon Of A in the sample= 28.99%
Explanation:
First we calculate the Peak area.
Because each peak is consdered like a triangle in a Chromatogram, The Area of the peak is calculated as = height x half height of the width
Area of Pea A= 25.1 mm X 4.6mm=115.46mm2
Area of Peak B= 14.5mm x 4.4mm=63.8mm2
Area of PeaK C= 37.1mm x5.9mm =218.89mm2
Total Peak Area= 398.15mm2
Percentage Area of Peak A = Area of Peak A/Total Peak Area x 100
= 115.46 / 398.15 x 100
=0.2899 x 100
=28.99%
Percentage Compositon Of A = 28.99%
Energy that is associated with the relative positions of electrons and nuclei in atoms and molecules is called
Answer:
chemical energy
Explanation:
chemical energy is potential energy
The energy associated with the relative positions of electrons and nuclei in atoms and molecules is called thermal energy.
Generally, the energy possessed by an object due to its position is known as potential energy of the object while the energy possessed by an object due to its motion is called kinetic energy.
However, thermal energy describes the energy that is associated with the relative positions of electrons and nuclei in atoms and molecules.
Thus, we can conclude that the energy associated with the relative positions of electrons and nuclei in atoms and molecules is called thermal energy.
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Read this excerpt from "Why Are They Called Black Holes?"
After many millions or billions of years, the star runs out of hydrogen and energy. Then the star "dies" and collapses into a dense little ball with tons of gravity. Albert Einstein’s theory of relativity predicted that black holes would have to exist if a dead star had enough gravity. Using Einstein's theory, astronomers calculated that if a star more than three times as heavy as our sun died, the force of gravity pulling matter in could overwhelm any other force pushing matter out.
In this excerpt, the author makes a connection between a scientific theory and
the calculations that scientists make.
the beginning of a star's existence.
the idea that all things live and die.
the question of why gravity exists.
Answer: the answer is c
Explanation: hope this helps you
Answer: the answer is c
Explanation: hope this helps you
What is chyme? It’s a brain-pop question
Answer:
the pulpy acidic fluid which passes from the stomach to the small intestine, consisting of gastric juices and partly digested food.
X-rays are electromagnetic waves that can penetrate skin, but not bone. In hospitals, X-rays are used to produce images of bones. How do X-rays compare to visible light? A. X-rays have a higher frequency and carry more energy than visible light. B. X-rays have a higher frequency and carry less energy than visible light. C. Visible light has a higher frequency and carries more energy than X-rays. D. Visible light has a higher frequency and carries less energy than X-rays.
Answer:
A. X-rays have a higher frequency and carry more energy than visible light.
Explanation:
Answer:
A. X-rays have a higher frequency and carry more energy than visible light
Explanation:
Both x-rays and visible light are electromagnetic waves.
The amount of energy carried by an electromagnetic wave depends on the frequency of the wave. The frequency of x-rays is greater than that of visible light, so the energy carried by x-rays is also greater than that of visible light. The high frequency of x-rays allows them to penetrate skin, but they are absorbed by bone, which allows an image of the bone to be produced.
