As sedimentary rocks are formed from the accumulation of sediment, fossils can be buried and preserved over time, leading to the formation of fossil-rich sedimentary rocks.
What is Fossils?
Fossils are the remains or traces of prehistoric plants, animals, and other organisms that are preserved in rocks. Fossils provide valuable insights into the evolution of life on Earth, as they can help scientists to understand the types of organisms that lived in the past, how they evolved, and how they interacted with their environment.
Rocks that form from lava, such as igneous rocks, typically do not contain fossils because the high temperatures involved in the formation of lava can destroy organic matter, including the remains of plants and animals.
When lava flows onto the surface of the Earth, it can quickly cool and solidify, forming an igneous rock. This rapid cooling process does not allow for the preservation of any organic material that might have been present in the lava, including fossils.
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A ________________ uses chemical formulas to model what happens in a chemical reaction.
Pick 1 of the following
molecule compound
chemical equation
chemical reaction
new chemical
Answer:
Explanation:
Chemical equation
What can be used to measure the ph of a substance
In a solution, litmus is blue. The pH of the solution could be
1. 10
2. 2
3. 3
4. 4
Answer:
1. 10
Explanation
when litmus paper is blue that means the solution is basic and 10 on the pH scale is the most basic out of all your options
Why is it important for the daughter cells to divide a second time in meiosis?
The second division switches parts of matching chromatids to increase genetic variation.
The second division forms four identical cells to ensure that all offspring have the same
The second division sorts chromosomes into cells that are the same as the parent cells.
The second division forms haploid cells that can combine with other haploid cells during fertilization.
Answer:
The second division switches parts of matching chromatids to increase genetic variation.
Explanation:
Meiosis and fertilization create genetic variation by making new combinations of gene variants (alleles).
A container has an unknown quantity of gas at a pressure of 121.6kPa, a volume of 31L and a temperature of 87oC. How many moles of gas are present ?
Answer:
1.26mol
Explanation:
Using the general gas law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K).
Based on the information provided in this question,
P = 121.6kPa = 121.6 × 0.00987atm = 1.2001 atm
V = 31L
T = 87°C = 87 + 273 = 360K
R = 0.0821 Latm/molK
Using PV = nRT
n = PV/RT
n = (1.2001 × 31) ÷ (0.0821 × 360)
n = 37.2031 ÷ 29.556
n = 1.258
n = 1.26mol
30 point. What is formed when a hydroxyl group is substituted for a hydrogen?
Answer:
alcohol
Explanation:
How many atoms are in 9.95 moles of iron?
How many molecules are in 0.03 moles of Carbon dioxide?
How many moles are found in 7.20 x 1023 atoms of platinum?
Answer:
59.92 × 10²³ atoms are in 9.95 moles of iron
1.8 ×10²² molecules are in 0.03 moles of Carbon dioxide
1.19 moles are found in 7.20 x 10^23 atoms of platinum
draw Fischer projection for L-ketononose
Answer: acttachec pic
The last carbon have the H on there, forgot to put it in :)
The Fischer projection of L-ketononose is:
H
|
CH₂OH-C=O-H
|
C
|
CH₂OH
Fischer projection is a two-dimensional representation of a three-dimensional molecule. In Fischer projection, the carbon atoms are drawn as vertical lines, and the hydrogen atoms and hydroxyl groups are drawn on the right-hand side or left-hand side of the carbon atoms. The carbonyl group is always drawn at the top of the Fischer projection.
The L-configuration is a type of configuration that is assigned to organic molecules based on the orientation of the hydroxyl group on the penultimate carbon atom. If the hydroxyl group is on the left-hand side of the Fischer projection, the molecule is assigned the L-configuration. If the hydroxyl group is on the right-hand side of the Fischer projection, the molecule is assigned the D-configuration.
In the Fischer projection of L-ketononose, the hydroxyl group on the penultimate carbon atom is on the left-hand side, so the molecule is assigned the L-configuration.
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If I have a 50 liter container that holds 45 moles of gas at a temperature of 200 0C, what is the pressure inside the container?
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Name a compound containing bromine and iodine
Synthesis. Iodine monobromide is formed when iodine and bromine are combined in a chemical reaction: I2 + Br2 → 2 IBr.
A balloon has a negative charge and a glass rod has a positive charge.
Electromagnetic Forces Review: Mastery Assessment #3: INTEG SCIENCE 7-Jolley
What will happen when the glass rod is brought near the balloon?
The volume and amount of aflium gas remains constant.
Under these conditions, aflium gas has an initial pressure of
635 torr when it is at 67.0°C. What is the new temperature if
the pressure drops to 250 torr?
Answer:
133.85 K
Explanation:
Initial pressure, P₁ = 635 torr
Initial temperature, T₁ = 67.0°C = 340 K
Final pressure, P₂ = 250 torr
We need to find the new temperature. The relation between temperature and pressure is given by :
[tex]\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\\\\T_2=\dfrac{P_2T_1}{P_1}\\\\T_2=\dfrac{250\times 340}{635}\\\\T_2=133.85\ K[/tex]
So, the new temperature is equal to 133.85 K.
The difference between sunspots solar flares and prominence
Answer:
Sunspots are cooler and darker than the rest of the Sun's surface. They are marked by intense magnetic activity. Solar prominences are the plasma loops that connect two sunspots. Solar flares and coronal mass ejections are eruptions of highly energetic particles from the Sun's surface.
Explanation:
Answer:
Sunspots are dark areas on the surface of the Sun that are cooler than surrounding areas. They appear in groups, vary in size, and cycle in number over an 11-year period. Solar flares are sudden eruptions of energy from a small area of the Sun's surface. They are extremely hot (10 to 20 million degrees Celsius) and extend into the corona. Solar flares occur near sunspots and can disturb radio communications on Earth.
Explanation:
[tex]plz \: help \: me \: it \: is \: due \: 2moro[/tex]
Answer:
hi.
Explanation:
1. B
2. C
3. A
4. B
5.B
hope this helps
When aqueous solutions of nickel(II) sulfate and ammonium phosphate are combined, solid nickel(II) phosphate and a solution of ammonium sulfate are formed
Answer:
3 NiSO₄(aq) + 2 (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + 3 (NH₄)₂SO₄
Explanation:
The question is missing but I think it must be about writing and balancing the equation.
Let's consider the unbalanced reaction that occurs when aqueous solutions of nickel(II) sulfate and ammonium phosphate are combined to form solid nickel(II) phosphate and a solution of ammonium sulfate. This is a double displacement reaction.
NiSO₄(aq) + (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + (NH₄)₂SO₄
We will start balancing Ni atoms by multiplying NiSO₄ by 3.
3 NiSO₄(aq) + (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + (NH₄)₂SO₄
Now, we have to balance S atoms by multiplying (NH₄)₂SO₄ by 3.
3 NiSO₄(aq) + (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + 3 (NH₄)₂SO₄
Then, we need to balance N atoms by multiplying (NH₄)₃PO₄ by 2. This will be the balanced equation.
3 NiSO₄(aq) + 2 (NH₄)₃PO₄(aq) ⇒ Ni₃(PO₄)₂ + 3 (NH₄)₂SO₄
How
many
moles of water are produced from 12.8 moles of oxygen?
with work
Answer:
12.8 moles
Explanation:
The formula for water is H2O, so for every mole of water, there are two moles of hydrogen and one mole of oxygen.
As the ratio of oxygen particles to water particles is one to one, 12.8 moles of oxygen are required to produce 12.8 moles of water.
Therefore, 12.8 moles of water are produced from 12.8 moles of oxygen (assuming hydrogen is available in excess).
i did not mean to publish this ;-;
Answer:
dang
Explanation:
Answer:
hi I guess I got free point s
Why would people with sickle-cell anemia get tired more easily than healthy people?
Explanation:
Because sickle-cells have trouble traveling through the smallest blood vessels, which means that muscles and tissue are not getting oxygen they need.
why is the absolute dating of rocks important?
Answer:
The dating of rocks is important because:
Explanation:
its important to know how the rocks have changed.
No links or files plz
Answer:
ice should start to melt at 1°
Which statement describes a space-filling model of a molecule?
A.The radii of the atoms are represented by the symbol of the atom surrounded by dots in the
space-filling model.
B.The radii of the spheres in a space-filling model are proportional in size to the radil of the atoms
they represent
C.The radii of the atoms present in the compound determine the length of the bonds in a space-
filling model.
Answer:
Option B, In a space-filling model of a molecule, the radii of the spheres in a space-filling model are proportional in size to the radii of the atoms
they represent
Explanation:
In a space-filling model of a molecule, atoms are represented as sphere. The radius of the sphere is equal to the radius of the atom and the distance between the center of one sphere to the center of other represents the distance between the atomic nuclei
Option B is correct
Option A is incorrect, as dots are used in the space filling model to represent the atoms
Option C is incorrect because radii of atom do not represents the length of the bonds in a space- filling model
1.) Magnesium reacts with oxygen and forms magnesium oxide. Write the reaction, and explain how you would find the oxidizing agent
2.) What are two advantages and one disadvantage of fuel cells
3.) How are voltaic and electrolytic cells similar, and how are they different? Include electrodes and their charges in your answer
Answer:
See explanation
Explanation:
1) The reaction of magnesium with oxygen is;
Mg(s) + O2(g) -----> MgO2(s)
The oxidizing agent is the reactant whose oxidation number decreases from left to right in the reaction equation. The oxidation state of oxygen decreased from zero to -2 hence oxygen is the oxidizing agent in the reaction.
2) The advantages of fuel cell includes;
i) it is a clean source of energy
ii) Fuel cells operate quietly and do not constitute noise pollution
One disadvantage of the fuel cell is that its operation is costly.
3) Electrolytic and voltaic cell are similar because they are both electrochemical cells and involve a transfer of electrons between two electrodes.
Electrolytic cells do not operate spontaneously while voltaic cells operate spontaneously. In the volatic cell the anode is negatively charged while the cathode is positively charged. In the electrolytic cell, the anode is positively charged while the cathode is negatively charged.
P4 +6Br2 --> 4PBr3
What is the ratio of the moles of P4 consumed to moles of PBr3 produced?
Answer:
1 mole of P₄ consumed:4 moles of PBr₃ produced
Explanation:
Look at the coefficients in the balanced chemical equation to determine the ratios. For every 1 mole of P₄ consumed (P₄ has a coefficient of 1), 4 moles of PBr₃ would be produced (PBr₃ has a coefficient of 4).
Answer:
[tex]\boxed {\boxed {\sf 1 \ mole \ P_4 consumed \ to \ 4 \ moles \ PBr_3 \ produced}}[/tex]
Explanation:
To find the mole ratio, we must use the coefficients.
[tex]P_4+6Br_2 \rightarrow 4PBr_3[/tex]
This equation is balanced (4 atoms of P and 12 atoms of Br on both sides), so we can go straight to the coefficients.
P₄ doesn't have a coefficient, so 1 is implied Br₂ has a coefficient of 6PBr₃ has a coefficient of 4So according to the coefficients above, for every 1 mole of P₄ that is consumed, 4 moles of PBr₃ are produced. Therefore, the ratio is 1 mole P₄ to 4 moles of PBr₃.
Commercially available cold packs are simple in design: a pouch with water on one side, isolated by a barrier from a specific salt on the other side. When the barrier is broken, the salt and water mix and the solution turns cold. Select which of the statements is true about the reaction occurring in cold packs. O The reaction between the salt and water is endothermic. O The reaction between the salt and water is exothermic. O The reaction between the salt and water is neither endothermic nor exothermic. The cold pack releases heat into the environment. #8
Answer:
The reaction between the salt and water is endothermic.
Explanation:
The reaction is endothermic because the reaction absorbs heat and causes the surroundings to become cooler.
Which one of the equations below is an exothermic reaction?
A) CO2 (g) - C(s) + O2 (g) AH = 394 kJ/mol
B) CaO (s) + H2O (D = Ca(OH)2 (aq) AH = -64
kJ/mol
C) C (s) + 2 F2 (g) - CF. (9) AH = 141.3
kJ/mol
2 NO (9) AH° = 180.6
D) N2 (g) + O2 (9)
kJ/mol
Answer:
B) CaO(s) + H2O(l) --> Ca(OH)2(aq)
Explanation:
This is the only reaction with a negative enthalpy value. Exothermic reactions have a negative enthalpy.
which metal is the most easily oxidized?
A. highly active metal
B. moderately active metal
C.slightly active metal
D.an inactive metal
Answer:
B. Moderately active metal
Explanation:
Calculate the number of moles in 8200 grams of iron
Can someone help me with this?
Answer:
150 moles (2 sig. figs.)
Explanation:
to convert from ...
grams to moles => divide by formula weight
moles to grams => multiply by formula weight
this problem:
Given mass of Iron (Fe) = 8200g
formula wt of Fe = 56g/mole
moles = mass/formula wt = 8200g / 56g/mol = 146.42857 moles (calculator) = 150 moles (2 sig. figs.)
The number of moles in 8200 grams of iron is 57.69 moles of Fe.
What is Mole concept ?Mole is defined as the amount of the substance containing the same number of discrete entities (atoms, molecules, ions, etc) as there are atoms in a sample of pure 12C weighing exactly 12g.
The number of particles present in one mole of any substance is Avogadro Number and is equals to 6.023 x 10²³ particles.
Given ;
Weight : 8200 grams of ironTo find ;
Mole (n) : ?Formula used :
Mole (n) = given weight / atomic weight= 8200 / 56 (atomic weight of Fe = 56 gm)
= 157.69 moles of Fe.
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The process by which sand is formed from rocks are...
Question 1 options:
melting and cooling
compaction and cementation
heat and pressure
weathering and erosion
Answer:
weathering and erosion
Explanation:
Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.
Answer:
weathering and erosion
When the offspring has a new genetic variation that a government neither of us parents it is called
What is the mass of 5.2 moles of Fe?
Answer:
279.225g
Explanation: