For a fossil to form, several conditions have to be met. First of all, the animal had to live in the given area! Animals live in many environments on Earth, but not everywhere. The water above many lake bottoms and many areas of the deep ocean bottom are stagnant. The bottom water is never exchanged with surface waters, so the water contains no dissolved oxygen. Animals cannot live without oxygen, so no animals live there. In these situations, the only possibility of fossilization is if a fish or other swimming animal dies in oxygen-rich waters above, sinks down into the stagnant muddy bottom, and is buried by sediments.
Answer:
In order for fossilization to occur, the following conditions are required: Hardbody parts (bones, teeth, shells) – soft body parts will not fossilize but may leave behind trace evidence.
Preservation of remains (protection against scavenging, erosion, and environmental damage)
Which is the correct electron configuration for the element Molybdenum (Mo)?
a
1s22s22p63s23p64s23d4
b
1s22s22p63s23p64s23d104p65s6
c
1s22s22p63s23p64s24d104p65s25d4
d
1s22s22p63s23p64s23d104p65s24d4
The correct electron configuration for the element Molybdenum (Mo) is;
a
1s22s22p63s23p64s23d4
b
1s22s22p63s23p64s23d104p65s6
c
1s22s22p63s23p64s24d104p65s25d4
d
1s22s22p63s23p64s23d104p65s24d4
Answer:
The correct answer is option d "1s22s22p63s23p64s23d104p65s24d4".
Explanation:
The electron configuration of an element is given by the distribution of its electrons in their different orbitals. In the case of Molybdenum (Mo), it has a total of 42 electrons, distributed in 10 orbitals. The correct electron configuration of Molybdenum (Mo) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d4, where the last number in each orbital represents the number of electrons (2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 + 4 = 42).
which of the following is not an appropriate unit for momentum?
g•m/s
kg•m/hr
km•m/s
g•cm/min
Answer: Option (c) is the correct answer.
Explanation:
Momentum is the product of mass and velocity.
Mathematically, p = m × v
where p = momentum
m = mass
v = velocity
It is known that mass can be measured in Kilograms or grams. Whereas velocity is measured in meter per second or centimeter per minute or hour.
On the other hand, unit kilometer is a unit of distance and not mass.
Thus, out of the given options km.m/s is not an appropriate unit for momentum.
The answer is: km•m/s.
Momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction in three-dimensional space.
km (kilometer) is not unit for the mass, it is unit for distance.
For example:
p(ball) = 218 kg·m/s; momentum of a ball.
Hey can you please help me with this I really need y’all
What are the atomic number and mass number of this atom
List the 3 ways carbon can enter the ocean?
Final answer:
Three ways carbon can enter the ocean are through running water, atmospheric dissolution, and decomposition of aquatic organisms.
Explanation:
Carbon can enter the ocean through three main ways:
Running water: Carbon is slowly dissolved in rocks by running water and eventually ends up in the ocean.Atmospheric dissolution: The top layer of ocean water dissolves some carbon dioxide out of the atmosphere.Decomposition of aquatic organisms: Carbon enters ocean water from the decomposition of aquatic organisms.What is the volume(in liters at stp) of 2.50 mil of carbon monoxide
The volume of one mole of substance is 22.4 L
To find the volume of 2.50 moles of carbon monoxide at STP, you multiply the moles by the molar volume at STP (22.4 L/mol), which gives you 56.0 liters.
To calculate the volume of carbon monoxide (CO) at standard temperature and pressure (STP), we should use Avogadro's Law. At STP, one mole of any gas occupies 22.4 liters. Given the amount of carbon monoxide in moles, we can determine the volume it would occupy at STP.
To find the volume:
Volume at STP (V) = Number of moles (n) x Molar volume at STP (Vm)
We know that:
[tex]n = 2.50\ moles\\ V_m = 22.4\ L/mol\ (volume\ occupied\ by\ one\ mole\ of\ gas\ at\ STP)[/tex]
So:
[tex]V = 2.50\ moles \times 22.4\ L/mol\\ V = 56.0\ liters[/tex]
This is the volume of 2.50 moles of carbon monoxide gas at standard temperature and pressure.
A substance which produces hydroxide ions when placed in water is a(n) _____.
A:dehydrate
B:base
C:solvent
99 points to whoever best answer.
The answer you're looking for is B:base
The base is disestablished in the water, and the molecules form into ions and produces OH- ions.
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Hope this helped:D
Question: A substance which produces hydroxide ions when placed in water is a _____.
Answer: base
Explanation: a substance that contains hydrogen causes to produce hydrogen ions
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24 g of magnesium were burned in oxygen. The compound formed had a mass of 40 g. Explain why the mass had gone up.
Answer :
According to the law of conservation of mass, the mass of reactants must be equal to the mass of products.
The balanced chemical reaction is,
[tex]Mg+\frac{1}{2}O_2\rightarrow MgO[/tex]
As we know that the molar mass of magnesium is 24 g/mole, the molar mass of [tex]O_2[/tex] is 32 g/mole and the molar mass of magnesium oxide is 40 g/mole.
From the given balanced reaction, we conclude that
As, 1 mole of magnesium react [tex]\frac{1}{2}[/tex] mole of oxygen to give 1 mole of magnesium oxide.
So, the mass of Mg is 24 g, the mass of [tex]O_2=\frac{1}{2}\times 32=16g[/tex] and the mass of MgO is 40 g.
That means 24 g of Mg react with 16 g [tex]O_2[/tex] to give 40 g of MgO.
The mass increased when magnesium burnt in oxygen because magnesium combines with oxygen to form magnesium oxide. This compound is heavier than the original magnesium because it includes the mass of both magnesium and oxygen.
Explanation:The mass increased when 24 g of magnesium was burnt in oxygen because magnesium combines with oxygen in the air to form a compound. This is fundamentally due to magnesium's affinity for oxygen. The resulting compound, magnesium oxide (MgO), has a higher mass because it combines the masses of both magnesium and oxygen. The reaction can be written as: 2Mg(s) + O2(g) → 2MgO(s). Here, oxygen from the air adds additional mass, resulting in a final product that is heavier than the original magnesium.
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between sour soup,melting of candle wax,rusting, and burning which is not a chemical reaction
Sour soup is not a chemical reaction
Scientists predicted Adamantium would have an Atomic radius of 327 pm. Once the element was measured experimentally, they found that the atomic radius was really 312 pm. Calculate the percent error of their prediction
The actual atomic radius of Adamantium is 327pm. The experimentally estimated value of atomic radius of adamantium is 312pm. The percent error can be calculated as,
Percent error = (actual value-estimated value)/actual value *100
= 327-312/327*100
=Approx. 5 percent error in their prediction.
47.0 ml of an HBr solution were rotated with 37.5 ml of a 0.215 m lioh solution to reach the equivalent point. What is the molarity of the hbr solution
The molarity of the HBr solution is 0,172 M.
The neutralization reaction between LiOH and HBr is the following:
HBr(aq) + LiOH(aq) → LiBr(aq) + H₂O(l)
Answer:
0.172 mol·L⁻¹
Step-by-step explanation:
1. Write the chemical equation for the reaction.
HBr + LiOH ⟶ LiBr + H₂O
===============
2. Calculate the moles of LiOH
c = n/V Multiply each side by V
n = Vc
V = 0.0375 L
c = 0.215 mol·L⁻¹
Moles of LiOH = 0.0375× 0.215
Moles of LiOH = 8.062 × 10⁻³ mol LiOH
===============
3. Calculate the moles of HBr
1 mol HBr ≡ 1 mol LiOH
Moles of HBr = 8.062 × 10⁻³× 1/1
Moles of HBr = 8.062 × 10⁻³ mol HBr
===============
4. Calculate the molar concentration of the HBr
V = 47.0 mL = 0.0470 L
c = 8.062 × 10⁻³/0.0470
c = 0.172 mol·L⁻¹
is P2I4 or Diphosphorus tetraiodide covalent or ionic?
Diphosphorus tetraiodide is a covalent compound.
It has low melting point as compared to ionic compounds
It is a rare compound where the oxidation state of Phosphorous is +2.
It is also termed as subhalide of phosphorous.
Answer: covalent bond.
Explanation:
A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal.
As [tex]P_2I_4[/tex] or Diphosphorus tetraiodide is made up of phosphorous and iodine which are both non metals , it is a covalent bond.
An electrical shock happens when electric _______ enters the body at one point and leaves through another.
A reflex response to the passage of electric current through the human body and results when electric current enters the body at one point and leaves through another. With that being said, your answer should be an eltrical shock happens when electrical CURRENT enters the body at one point and leaves through another.
Answer:An electrical shock happens when electric current enters the body at one point and leaves through another.
Explanation:An electric shock happens when someone comes into contact with any source of electrical energy. This can be due to a lightning strike or due to a man-made source of electricity such as electrical circuits or appliances. The shock occurs when the electricity flows through the body.
Determine the heat given off to the surroundings when 9.873 g of aluminum reacts according to the equation 2Al + Fe2O3 → Al2O3 + 2Fe, ΔH°rxn= -849.1 kJ/mol.
Answer : The heat given off to the surroundings will be, -155.38 KJ
Solution : Given,
[tex]\Delta H^o_{rxn}=-849.1KJ/mole[/tex]
Mass of aluminium = 9.873 g
Molar mass of aluminium = 27 g/mole
First we have to calculate the moles of aluminium.
[tex]\text{ Moles of Al}=\frac{\text{ Mass of Al}}{\text{ Molar mass of Al}}=\frac{9.873g}{27g/mole}=0.366moles[/tex]
The given balanced reaction is,
[tex]2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe[/tex]
From the reaction, we conclude that
2 moles of aluminum releases heat energy = -849.1 KJ
0.366 moles of aluminium releases heat energy = [tex]\frac{-849.1KJ}{2moles}\times 0.366moles=-155.38KJ[/tex]
Therefore, the heat given off to the surroundings will be, -155.38 KJ
which kind of covalent bond has unequal sharing of electrons
A polar covalent bond apex!
The type of covalent bond with unequal sharing of electrons is a polar covalent bond. This occurs when one atom in the bond has a stronger attraction for electrons, creating region of slight positive and negative charges.
Explanation:The type of covalent bond that has unequal sharing of electrons is referred to as a polar covalent bond. Covalent bonds occur when two nonmetals share electrons in order to achieve a full outer energy level. However, sometimes these electrons are not shared equally because one of the atoms has a stronger attraction for electrons - we call this atom more electronegative. The most electronegative atom pulls the electrons closer to itself, causing a slight negative charge in its area and a slight positive charge in the other area, hence it is called a polar covalent bond.
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according to the kinetic theory as the volume of a gas increase
According to Boyle's Law, it has been observed that as the pressure of a gas increases, the volume of the gas decreases. The Kinetic Theory of gases explains this observation with which of the following statements: The gas particles strike the walls of the container more often.
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Which of the following best describes a metal? Brittle, shiny, and solid Brittle, dull, and low density Malleable, shiny, and able to conduct heat or electricity Malleable, dull, and solid, liquid, or gas at room temperature?
Answer : The correct option is, Malleable, shiny, and able to conduct heat or electricity.
Explanation:
Metals : Metals are the elements which can easily loose electrons and forms cations.
Properties of metals :
They are lustrous (shine).They are malleable and ductile (flexible).They conduct heat and electricity.The metallic oxides are basic in nature. They form cations in an aqueous solution.Non-metals : Non-metals are the elements which can easily gain electrons and form an anion.
Properties of non-metals :
They are non-lustrous.They are brittle and hard in nature.They do not conduct heat and electricity.The non-metallic oxides are acidic in nature. They form anions in an aqueous solution.Hence, from the given options the correct option for metal is, Malleable, shiny, and able to conduct heat or electricity.
Answer:
Malleable, shiny, and able to conduct heat or electricity
Hope this helps! :D
Explanation:
in sexual reproduction, of each chromosome in a pair has the same genes, how is genetic variety possible?
This answer will depend on if you are speaking about asexual reproduction or not.
Variety is possible here because the the product genes are half from the mother and half from the father. So a child might have blue eyes from his mother, but red hair from his father, etc. Different genetic mutations are the initial cause of all differentiation between genes, which are passed down from each generation to the next through this same process.
In Asexual reproduction, all reproductions are essentially clones of the parent, and no genetic variation, other than mutations will occur.
Punnet Squares, they are charts to determine genetic variation by genotype and phenotype :)
AgI + Na2S Ag2S +NaI=
The equation needs to be balanced and written as,
[tex]2AgI+1 Na_{2} S[/tex]→[tex]1Ag_{2} S+2NaI[/tex]
Both side of compound should contain equal masses.
For the following reaction if you have 13.2g of CO and 42.7g of Fe2O3, which is the limiting reagent with regards to the Fe production? Fe2O3(s) + 3CO (g) —> 2Fe(s) + 3 CO2 (g)
Answer: CO is a limiting reagent with regards to the Fe production.
Explanation:
[tex]Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)[/tex]
Moles of CO = [tex]\frac{\text{mass of CO}}{\text{molar mass of CO}}=\frac{13.2 g}{28 g/mol}=0.4714 mol[/tex]
moles of [tex]Fe_2O_3=\frac{\text{mass of} Fe_2O_3}{\text{molar mass of}Fe_2O_3}=\frac{42.7 g g}{159.7 g/mol}=0.2673 mol[/tex]
According to reaction , 3 mole of CO reacts with 1 mole of [tex]Fe_2O_3[/tex] then , 0.4714 moles of CO will react with : [tex]\frac{1}{3}\times 0.4714 [/tex] moles of [tex]Fe_2O_3[/tex] that is 0.1571 moles.
0.4714 moles of CO will react with 0.1571 moles of [tex]Fe_2O_3[/tex] which means that CO is present in limited amount acting as limiting reagent.
Mole remaining of [tex]Fe_2O_3[/tex] = 0.2673 mol - 0.1571 mol = 0.1102 mol
Hence, CO is a limiting reagent and [tex]Fe_2O_3[/tex] is an excessive reagent.
For a 0.50 molal solution of sucrose in water, calculate the freezing point and the boiling point of the solution.
Answer:
-0.93 °C; 100.26 °C
Step-by-step explanation:
(a) Freezing point depression
The formula for the freezing point depression ΔT_f is
ΔT_f = iKf·b
i is the van’t Hoff factor: the number of moles of particles you get from a solute.
For sucrose,
Sucrose (s) ⟶ sucrose (aq)
1 mole sucrose ⟶ 1 mol particles i = 1
ΔT_f = 1 × 1.86 × 0.50
ΔT_f = 0.93 °C
T_f = T_f° - ΔT_f
T_f = 0.00 – 0.93
T_f = -0.93 °C
(b) Boiling point elevation
The formula for the boiling point elevation ΔTb is
ΔTb = iKb·b
ΔTb = 1 × 0.512 × 0.50
ΔTb = 0.256 °C
Tb = Tb° + ΔTb
Tb = 100.00 + 0.256
Tb = 100.26 °C
Answer:
Explanation:
1. If the Kf = 1.86 ºC / m for water, what is the freezing point depression for the sucrose solution?
ΔT = iKf m
i=1 for sucrose
Kf = 1.86 ºC / m
m = 0.50
ΔTf = 1.86 x 0.50 = 0.93 ºC
2. If the Kb = 0.512 ºC / m for water, what is the boiling point elevation for the sucrose solution?
ΔT = i Kb m
i=1 for sucrose
Kf = 0.512 ºC / m
m = 0.50
ΔTf = 0.512 x 0.50 = 0.26 ºC
Which of the following is correctly abbreviated SI unit describing the mass of an object?
A) kg
B) mol
C) m
D) M
Which of the following is correctly abbreviated SI unit describing the mass of an object?
A) kg
A) kg is your answer
"Mass" is weight without gravity, and so the SI unit would also use the weight measurement. (You solve by dividing the force of gravity from the total weight to get mass.)
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Water vapor is condensed steam.
True
False
The statement is false. Water vapor is the gaseous state of water, while condensed steam is liquid water. Water vapor can become 'condensed', or turned into liquid, through a process called condensation.
Explanation:The statement 'Water vapor is condensed steam' is False.
Water vapor is the gaseous state of water, which is commonly formed from the evaporation or boiling of liquid water or from the sublimation of ice. Condensed steam, on the other hand, refers to steam, or water vapor, that has been cooled down to return to its liquid state - this process is known as condensation.Therefore, condensed steam would be liquid water, not water vapor.
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how many individual atoms make up one unit of aluminum chloride, ALCL3?
4 atoms make up aluminium chloride: 1 aluminum atom and 3 chlorine atoms
What is the second step in the classification of living things?
A.) Assigning them to any of the 6 domains
B.) Assigning them to any of the 3 domains
C.) Assigning them to any of the 6 kingdoms
D.) Assigning them to any of the 3 kingdoms
Answer:
B.) Assigning them to any of the 3 domains
Explanation:
The second step in the classification of living beings is to assign them to any of the three domains. There are not six domains. Furthermore, there are neither six nor three kingdoms, there are 5 kingdoms.
The three domains are:
→ Bacteria Domain: It groups most of the unicellular prokaryotes, such as bacteria and cyanobacteria.
→ Domain Archaea: It groups prokaryotes with different biochemical characteristics and that usually inhabit regions with extreme conditions.
→ Eukaria domain: It groups all unicellular and multicellular eukaryotic organisms, such as fungi, animals, plants and organisms previously classified as protists.
Write a balanced equation for double replacement of KOH+ZnCl2
Answer :
Double replacement reaction : It is a type of reaction in which a positive cation and a negative anion of the reactants react to give a new compound as a product.
[tex]AB+CD\rightarrow AD+CB[/tex]
In this, A and C are the cations and B and D are the anions.
When one mole of potassium hydroxide react with the one mole of zinc chloride to give one mole of zinc hydroxide and 2 moles of potassium chloride.
The balanced chemical reaction is,
[tex]KOH+ZnCl_2\rightarrow Zn(OH)_2+2KCl[/tex]
BRAINLIEST HELP PLEASE!!!!
1) The table below shows the volume of two samples, X and Y, when placed in three containers of different volumes.
Volume of Samples
Volume of Container Volume of Sample X Volume of Sample Y
200 mL 200 mL 200 mL
500 mL 200 mL 500 mL
600 mL 200 mL 600 mL
Which of the following correctly describes the state of matter of one of the samples?
Y is a gas because it has a definite volume.
X is a liquid because it has a definite volume.
Y is a liquid because it fills up the entire container.
X is a gas because it fills up the entire container.
2) The table below shows the dimensions of two colored cubes.
Dimensions of Cubes
Cube Side (cm) Mass
(g)
Yellow 3 135
Black 2 48
Which cube is denser?
Black, because it has less volume and less mass.
Yellow, because it has more volume and more mass.
Black, because the product of its side and mass is lower.
Yellow, because the product of its side and mass is higher.
Answer:
1)B X is a liquid because it has a definite volume.
2)D White, because it has less volume, but a lot more matter.
Do not pick black it it wrong
take a look
(1) In the given samples of X and Y, the definite volume has been observed for sample X. Thus, X has been a liquid. Hence, option B is correct.
(2) The yellow box has been denser, as the product of mas and side has been higher. Thus, option D is correct.
The volume of the substance has been defined as the space occupied by the matter. The mass of substance has been the product of density and volume.
Volume and Density of matter(1) The state of matter has been based on the intermolecular attractions. The solid state has definite shape and volume.
Liquid has definite volume, but no defined shape. While gases have no definite volume and shape.
In the given samples of X and Y, the definite volume has been observed for sample X. Thus, X has been a liquid. Hence, option B is correct.
(2) The density has been defined as mass per unit volume.
The volume of cube has been given as:
[tex]\rm Volume=a^3[/tex]
Where, a has been the side of the cube
The density has been expressed as:
[tex]\rm Density=\dfrac{Mass}{Volume}[/tex]
Thus, the object with lower volume and more mass has been denser than the other.
The yellow cube has mass 135 g, and volume 27 cubic centimeters
The black cube has mass 48 g, and volume 8 cubic centimeters.
The yellow box has been denser, as the product of mas and side has been higher. Thus, option D is correct.
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What are the differences between thermoplastics and thermosetting plastics? Give examples and draw a simple diagram to show what kind of linkages are there in the polymer chains.
on the basis of the reaction of heat in plastic , their are two types of plastics :
Thermoplastic & Thermosetting plasticsThermoplastics : Plastics which easily get deformed (become soft )on heating and also get bend easily are known as thermoplastics .
examples : polythene , polyvinyl chloride and polystyrene .
thermosetting plastics : plastics which once moulded into a shape do not become soft on heating and cannot be moulded again are called thermosetting plastics .
examples : bakelite , melamine and formica
In the formula for water (H2O), what does the subscript 2 indicate?
the answer is actually "Two hydrogen atoms in the compound" >.>
Which circuit is a series circuit?
Answer : The correct series circuit is, (D)
Explanation :
Parallel circuit : In this circuit, the potential across each of the components are same but the current flow in the circuit is equal to the sum of the current flow of each components.
That means in this circuit, the potential across the circuit is same but current is different.
[tex]I=I_1+I_2+I_3[/tex] where, 'I' is current.
Series circuit : In this circuit, the current flow each of the components are same but the potential across the circuit is equal to the sum of the potential of each components.
That means in this circuit, the current flow across the circuit is same but potential is different.
[tex]V=V_1+V_2+V_3[/tex] where, 'V' is potential.
From the given circuits, the circuit D is the series circuit. while the other circuits are parallel circuits.
Hence, the given circuit (D) is a type of series circuit.
The circuit that can be said to be a series circuit is option D
What is a series circuit?An electrical circuit arrangement known as a series circuit is one in which all of the parts or devices are linked one after the other in a single channel, creating a single closed loop.
Because there is only one path for the current to travel, the same current passes through every component in a series circuit. Depending on each component's resistance or impedance, the voltage across the circuit is distributed among them.
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