the density of granite is approximately 2.7 grams per cubic centimeter. what would be the approximate mass of a cube of granite 10.0 centimeters on a side
Given parameters:
Density = 2.7g/cm³
Length of the cube = 10cm
Unknown:
Mass of the cube = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
Mass = density x volume
We need to find the volume of the cube;
Volume of the cube = L³
where L is the length of the cube;
Volume of the cube = 3³ = 27cm³
So, the mass of the granite = 2.7 x 27 = 72.9g
The granite has a mass of 72.9g
Which of these statements is true about a neutral atom of chromium (Cr)? help
A.has more protons than electrons
B. has fewer subatomic particles than an atom of iron (Fe)
C.has 52 protons and 52 electrons
D.has more electrons than neutrons
Answer : The correct option is, (B) has fewer subatomic particles than an atom of iron (Fe) .
Explanation :
The given element is chromium (Cr). The atomic number of chromium is 24.
As we know that the atomic number is either equal to the number of protons or number of electrons.
So, Atomic number = Number of protons = Number of electrons = 24
And we know that mass number is the sum of number of protons and number of neutrons.
Mass number of chromium = 52
Mass number = Number of protons + Number of neutrons
52 = 28 + Number of neutrons
Number of neutrons = 28
And we know that the atomic number of iron (Fe) is 26.
Number of protons = Number of electrons = 26
Mass number of Fe = 56
Number of neutrons = 30
From the given options we conclude that the a neutral atom of chromium has fewer subatomic particles than an atom of iron (Fe).
Hence, the correct option is, (B) has fewer subatomic particles than an atom of iron (Fe) .
It is determined that a metal sample contains 0.251 moles of iron. How many iron atoms are in the sample?
Given parameters:
Number of moles of iron = 0.251 moles
Unknown:
Number of atoms = ?
Solution:
A mole of an atom contains the Avogadro's number of particles;
Avogadro's particles = 6.02 x 10²³ atoms
1 mole of atom = 6.02 x 10²³ atoms
0.251 moles = 0.251 x 6.02 x 10²³ = 1.51 x 10²³ atoms
The number of atoms here is 1.51 x 10²³ atoms
The number of atoms in 0.251 mol of Iron sample has been [tex]1.51\;\times\;10^2^3[/tex].
The number of atoms in a mole of sample has been given by the Avogadro law. According to the Avogadro law, the number of atoms in 1 mole of sample has been equivalent to the Avogadro number.
The Avogadro number has been a constant quantity with the value of [tex]6.023\;\times\;10^2^3[/tex].
Computation for Iron atomsThe given mole of iron has been 0.251 mol.
The number of atoms in the sample has been given as:
[tex]\rm 1\;mol=6.023\;\times\;10^2^3\;atoms\\ 0.251\;mol=0.251\;\times\;6.023\;\times\;10^2^3\;atoms\\ 0.251\;mol=1.51\;\times\;10^2^3\;atoms[/tex]
The number of atoms in 0.251 mol of Iron sample has been [tex]1.51\;\times\;10^2^3[/tex].
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P-3 has how many electrons?
-15
-12
-18
-none of these
the food into energy for her muscles? *
O thermal
O physical
O chemical
Answer:
chemical
Creatine Phosphate (with oxygen) So all muscle cells contain a high-energy compound called creatine phosphate which is broken down to make more ATP quickly. Creatine phosphate can supply the energy needs of a working muscle at a very high rate, but only for about 8–10 seconds.adenosine triphosphate (ATP)
The source of energy that is used to power the movement of contraction in working muscles is adenosine triphosphate (ATP) – the body's biochemical way to store and transport energy. However, ATP is not stored to a great extent in cells
why do you think people believed ________ over ________? Think about the structure of society during that time period
Answer:
Is there any other details to help with the question?
Melting can be best described as a process in which molecules
lose kinetic energy and move slowly.
lose kinetic energy and remain stationary.
gain kinetic energy and escape into the atmosphere.
gain enough kinetic energy to get past each other.
Answer:
Your answer is D (gain enough kinetic energy to get past each other.)
Explanation:
Melting can be best described as a process in which molecules gain enough kinetic energy to get past each other and the correct option is option D.
What is melting?
Melting is the process by which a substance changes from the solid phase to the liquid phase. Melting is also known as fusion, although this term has several meanings in science.
Melting occurs when the kinetic energy of a solid increases by application of heat or pressure, such that the molecules of solid start vibrating faster but stay close to their neighboring particles, rolling around each other. This particle movement allows the substance to flow and form a liquid.
Therefore, melting can be best described as a process in which molecules gain enough kinetic energy to get past each other and the correct option is option D.
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A type of matter formed by chemically joining two or more elements is known as a A compound B) solution c) colloid D suspension
Answer:
A) compund
Explanation:
Determine the mass of 3.45 moles of Cobalt.
Answer:
203g
Explanation:
Multiply #moles by cobalt's molar mass:
molar mass= 58.9332g/ 1 mole)
3.45 mole Cobalt (58.9332g/ 1 mole)= 203g <-- 3 significant figures
According to the mole concept, mass of 3.45 moles of cobalt is 203.30 g.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Mass of 3.45 moles of cobalt is obtained as, mass=number of moles ×molar mass
Substitution of values gives ,mass=3.45×58.93=203.30 g.
Thus, the mass of 3.45 moles of cobalt is 203.30 g.
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If the input force applied to one end of a first-class lever is 8 N, and the fulcrum is located 6 m away from the input force but 3 m away from the output force, what will be the resulting output force?
Answer:
16 N
Explanation:
The ratio of output force to the input force is called mechanical advantage of the lever. Also, the ratio of input arm distance to the output arm distance is called mechanical advantage of the lever.
We have,
Input force = 8 N
Input arm distance = 6 m
Output arm distance = 3 m
We need to find the resulting output force. So,
[tex]\dfrac{F_o}{8}=\dfrac{6}{3}\\\\F_o=16\ N[/tex]
So, the resulting output force is 16 N.
What do you need to form a cloud?
moisture, condensation, and temperature. 2. Evaporation and condensation are part of how a cloud forms.
In the electron cloud model of the atom, what does the cloud represent?
Answer:
electrons/electron density
Explanation:
The branch of science that deals with electrons are called chemistry. An element consists of electrons, protons, and neutrons.
The correct answer to the question is electrons density.
What is an electron?The electron is a subatomic particle whose electric charge is negative one elementary charge. Electrons belong to the first generation of the lepton particle family and are generally thought to be elementary particles because they have no known components or substructure.In the cloud model, the electrons are revolving around the nucleus. In an atom when the electron's density is very high which represents a cloud.
Hence, the correct answer is electrons.
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Express the answer to each of the following calculations with the correct number of
significant figures.
a) 3.42 + 8.132
b) 4.9 + 3.822
c) 17.8 + 12.115 d) 4.55 + 3.45
e) 1.966 + 3.4422
f) 3.882 – 2.1
g) 4.894 - 2.03
h) 15.6600 - 12.838
i) 11.22 - 8.8
j)133-20
Answer:
a)11.552
b)8.722
c)29.915
d)8
e)5.4082
f)1.782
g)2.864
h)2.822
i)2.42
j)113
The correct number of significant figures are a.5 b.4 c.5 d.1 e.5 f.4 g.4 h.5 i.3 j.3 for all the calculations.
what are significant figures?Significant figures or digits are the minimum numbers from zero to nine which are used for the report of results that are uncertain and decimal is not a significant figue and starting zeros too.
the total number of significant figures are,
a) 3.42 + 8.132 =11.732 = 5 significant figures.
b) 4.9 + 3.822 = 8.722 = 4 significant figures.
c) 17.8 + 12.115 = 29.915 = 5 significant figures.
d) 4.55 + 3.45 = 8 = 1 significant figures.
e) 1.966 + 3.4422 = 5.4082 = 5 significant figures.
f) 3.882 – 2.1 = 1.722 = 4 significant figures.
g) 4.894 - 2.03 = 2.866 = 4 significant figures.
h) 15.6600 - 12.838 = 2.8262 = 5 significant figures.
i) 11.22 - 8.8 = 2.42 = 3 significant figures.
j)133-20 = 113 = 3 significant figures
Therefore, The correct number of significant figures are a.5 b.4 c.5 d.1 e.5 f.4 g.4 h.5 i.3 j.3 for all the calculations.
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daniel has a sample of pure copper. its mass is 89.6 grams and its volume is 10 cubic centimeters whats the density of the sample
Answer:
The answer is 8.96 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{89.6}{10} \\ [/tex]
We have the final answer as
8.96 g/cm³Hope this helps you
Why do isotopes of the same element have the same atomic size?
Answer:
Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2). Isotopes of a given element contain different numbers of neutrons, therefore, different isotopes have different mass numbers.
The atomic size of an element significantly depends on the number of protons. It is the characteristic property of isotopes that they possess the same number of protons which is responsible for the same atomic size.
What are Isotopes?Isotopes may be defined as one of two or more species of atoms of a chemical element that have the same atomic number and location in the modern periodic table with identical chemical behavior but with different atomic masses and physical properties.
In a more simple sense, isotopes are those elements that have the same atomic number but different atomic mass. The atomic number depends on the number of protons which remains constant in isotopes. So, the isotopic elements have identical atomic sizes.
Therefore, the isotopes of the same element have the same atomic size.
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The nuclear equation is incomplete. Superscript 239 Subscript 94 Baseline P u + Superscript 1 Subscript 0 Baseline n yields Superscript 100 Subscript 40 Baseline Z r + blank + 2 Superscript 1 Subscript 0 Baseline n What particle completes the equation? Superscript 138 Subscript 54 Baseline X e Superscript 139 Subscript 54 Baseline X e Superscript 119 Subscript 54 Baseline X e Superscript 138 Subscript 52 Baseline T e
Answer:
The correct option is the first option
Explanation:
The equation described in the question is shown below
²³⁹₉₄Pu +¹₀n ⇒ ¹⁰⁰₄₀Zr + blank + 2¹₀n
This equation is a nuclear fission because it involves the splitting of a heavy nucleus, Plutonium (Pu), into smaller nuclei, Zirconium (Zr) and an unknown nuclei.
The law of conservation of matter states that matter can neither be created nor destroyed hence in other to get the missing atom, we must know the total number of subscripts (mass number) and superscripts (atomic number) on both sides.
The total mass number on the reactant side is 239 + 1 = 240
The total atomic number on the reactant side is 94 + 0 = 94
While, The total mass number on the product side is 100 + 2(1) = 102
The total atomic number on the product side is 40 + 2(0) = 40
To determine the missing atom, you subtract the the total atomic number of the product from that on the reactant side; 94 - 40 = 54
The atom with the atomic number 54 is Xenon,
To determine the mass number of the xenon isotope involved, you subtract the the total mass number of the product from that on the reactant side; 240 - 102 = 138.
Hence, the particle that completes the equation is ¹³⁸₅₄Xe, the first option
Answer: A on edge
Explanation:
the person above me explained it well but i wanted to shorten it.
A 6-mile wide meteorite hit the earth 65 million years ago. Scientists have found a high concentration of iridium in the sedimentary clay layer from this time period. Iridium is very rare in Earth’s crust, but it is abundant in meteorites. Scientists believe this impact caused the extinction of the dinosaurs. Which of these statements correctly describes whether this is a theory or a law and why?
A. It is a law, because it includes a numerical analysis.
B. It is a law, because it explains all causes of animal extinction.
C. It is a theory, because it explains the cause of the dinosaur extinction.
D. It is a theory, because it shows regular patterns from a generalization of the data.
How many oxygen atoms are there in 3 molecules of CH3FO?
Answer: There should be 3.
Explanation:
When Liza was reading over the “Best of Blueberries” article, she quickly changed the claim in the article that read “1 cup of blueberries contains around 180 calories” because 1 cup of blueberries actually only contains about 80 calories. What does Liza MOST LIKELY do for a living?
researcher/fact checker
copy editor
commissioning editor
editorial expert
Answer:
your Answer is The first one, Its A, resercher/ fact checker
Explanation:
What is the predicted outcome for very low mass stars (those that are smaller than about the mass of the sun)?
Answer:
In case of low-mass stars,the outer layers of the low mass stars are expelled as the core collapses such that the outer layers form a planetary nebula.
Explanation:
In case of low-mass stars,the outer layers of the low mass stars are expelled as the core collapses such that the outer layers form a planetary nebula. The core remains as a white dwarf and finally become a black dwarf as it cools down. A low mass star consumes its core hydrogen and turns it into helium over its lifetime.
Match the words to the correct descriptions.
Have different properties depending on the number of protons.
The ingredients maintain their properties when they are placed together or taken apart.
The atoms take on new properties when they bond together or are separated.
1.
Compounds
2.
Mixtures
3.
Atoms
Answer:
1. Atoms, Have different properties depending on the number of protons.
2. Mixtures, The ingredients maintain their properties when they are placed together or taken apart.
3. Compounds, The atoms take on new properties when they bond together or are separated.
Explanation:
How many electron domains does IF4+ have?
Is frying an egg a physical or a chemical change? Explain in detail
Answer:
Yes, a cooking egg is a chemical change! Water is evaporated from the egg and the egg changes composition. You might say that raw egg and water are the reactants and cooked egg and water vapor are the reactants.
Explanation:
Frying an egg is an example of a chemical change.
What is a chemical change?A chemical change refers to a kind of irreversible change. In this type of change, the element that undergoes a transformation cannot be returned to its original state.
This is the case with an egg which when fried cannot be returned to its original liquid state. So, unlike a physical change tha can be reversed, a chemical change is irreversible.
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What must be true if an atom is ionized?
Select one:
a. It must be radioactive
O b. It must have different numbers of protons and neutrons
O c. It must have an electron that has jumped to a higher energy
level
O d. It must have different numbers of protons and electrons
Answer:
I think it’s D.
Explanation:
An atom does not have a different amount of protons and electrons if there is no change... During ionisation you either lose or gain electrons, so when that happens (a change) it will have a different number.
A 45.0 g coin of copper absorbed 45 calories of heat. What was the final
temperatuře of the copper if the initial temperature was 25°C? The specific heat
of copper is 0.092 cal/g°C. *
What is the correct name for LiF?
Answer:
Lithium Fluoride.
Explanation:I know science.
Carbon-14 has a half-life of 5730 years. How much of a 144 g sample of carbon-14 will remain after
1.71910 years
Answer:
i miss you
Explanation:
How much pressure is in the transition zone? Just need the answer.
☆<《 HOPE IT WILL HELP YOU 》>☆
Explanation:
The transition zoneis the part of Earth's mental. It is located between the lower mental and upper mental. It is between the depth of 410km TO 660km
What is the name of the ionic compound CaCN?
Answer:
Calcium cyanamide
Explanation:
I think it has to be calcium cyanide, because of the cyanamide ion (CN).
The largest ruby in the world is 10.9 cm long, 9.10 cm wide, and 5.80 cm thick, giving it an overall volume of 575 cm3. If the density of ruby—a form of aluminum oxide—is 3.97 g/cm3, what is the mass of the largest ruby?
Given parameters:
Volume of the ruby = 575cm³
Density of the ruby = 3.97g/cm³
Unknown:
Mass of the largest ruby = ?
Solution:
Density is the mass per unit volume of a substance. It is an intrinsic property of matter that is unique to each of them.
Mathematically;
Density = [tex]\frac{mass}{volume}[/tex]
Since mass is the unknown;
Mass = density x volume
Input the parameters and solve;
Mass = 3.97 x 575 = 2282.75g
The mass of the largest ruby is 2282.75g