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This tree species was preserved as a fossil in the Arizona desert. The species is now extinct. Describe what the environment was like when the tree lived and how it is different now. Then, infer why this type of tree and other living things that lived with it are extinct.
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Related Questions
If 2.28 g C8H18 reacts with 7.00 g of Oz, predict the mass of CO, that can be produced and
identify the limiting reactant. Explain how you got your answers.
Unbalanced equation: C8H180 + 026) • CO26) + H₂O
Answers
Answer:
O₂ is limiting reactant and 6.17g CO₂ can be produced
Explanation:
Based on the balanced reaction:
C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O
1 mole of C₈H₁₈ reacts with 25/2 moles O₂.
To solve this question we must convert the mass of each reactant to moles and, using the balanced reaction, we can find limiting reactant. With moles of limiting reactant we can find the moles of CO₂ and its mass as follows:
Moles C₈H₁₈ -Molar mass: 114.23g/mol-
2.28g * (1mol / 114.23g) = 0.0200 moles C₈H₁₈
Moles O₂ -Molar mass: 32g/mol-
7.00g * (1mol / 32g) = 0.219 moles O₂
For a complete reaction of 0.0200 moles C₈H₁₈ are needed:
0.0200 moles C₈H₁₈ * (25/2moles O₂ / 1mole C₈H₁₈) = 0.250 moles of O₂ are needed.
As there are just 0.219 moles, O₂ is limiting reactant.
Moles of CO₂ that can be produced:
0.219 moles O₂ * (8moles CO₂ / 25/2moles O₂) = 0.140 moles CO₂
The mass is -Molar mass CO₂: 44.01g/mol-:
0.140 moles CO₂ * (44.01g / mol) =
6.17g CO₂ can be producedIf the half-life of a radioactive substance is 500 million years and you have 48 atoms of it, how many half-lives will have passed by the time that 6 atoms of the substance remain?
O A. 3
O B. 2
O C. 4
O D. 5
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Answer: 3
Explanation:
A heterogeneous mixture always contains
only one substance.
O more than two substances.
O two or more substances that are visibly distinguishable.
O two or more substances that are not visibly distinguishable.
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Answer:
two or more substances that are visibly distinguishable.
HELP ASAP
In which reaction are the atoms of elements rearranged?
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Explanation:
A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does.
In a chemical reaction, the atoms and molecules that interact with each other are called reactants.
In a chemical reaction, the atoms and molecules produced by the reaction are called products.
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.
In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Answer:
It is B
Explanation:
The formation of water is a chemical reaction which rearranges atoms. The other reactions are nuclear reactions.
Birds use their feathers for flight and fluff their feathers to keep warm. Based on Natalia's feather experiment, how do oil spills affect birds’ ability to use their feathers?
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Answer:
As shown previously on Natalia's experiment, oil spills will dangerously affect birds' abilities to user their feathers. When oil gets on a feather, the mass of it increases and it becomes soggy and wet. If birds try to go in water like the ocean, it will not get any better because the ocean is cold. Flying won't be easy because they have additional weight stuck to them.
Explanation:
Hope this helps you!
How many grams of copper (II) oxide will react with 10 liters of hydrogen gas?
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Answer:
maybe 200g
I don't know thats just a guess
HOPE ITS TURE
What is the percent by mass of carbon in carbon dioxide (CO2)?
A. 27%
B. 33%
C. 43%
D. 73%
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What is the hydroxide ion concentration of a solution with a pH of 4?
A. 1x10^-4
B. 1x10^-7
C. 1x10^-14
D. 1x10^-10
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Answer:
Jules
Explanation:
The best way to increase the amount of a solid solute dissolved in a saturated solution would be to
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Answer:
The solubility of a saturated solution can be increased by increasing the temperature.
Explanation:
Temperature -- Generally, an increase in the temperature of the solution increases the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water than in cold water. A few solid solutes, however, are less soluble in warmer solutions.
True or False: Molecular formula gives you the smallest whole number ratio of elements in a compound. *
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Answer:true
Explanation:The molecular formula indicates the exact number of atoms in the molecule. The empirical formula expresses the smallest whole number ratio of the atoms in the element.
How many moles are in 2.8x10^24 atoms of silicon?
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Answer:
4.6 mol Si
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
[Given] 2.8 × 10²⁴ atoms Si
[Solve] moles Si
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 2.8 \cdot 10^{24} \ atoms \ Si(\frac{1 \ mol \ Si}{6.022 \cdot 10^{23} \ atoms \ Si})[/tex][DA] Divide [Cancel like units]: [tex]\displaystyle 4.64962 \ mol \ Si[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
4.64962 mol Si ≈ 4.6 mol Si
If a book has a weight of 23.2 N on Earth, what is its mass?
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Answer: Mass is 2,37 kg
Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.
m = W/g = 23.2 N / 9.81 m/s²
How is entropy related to the spontaneity of a reaction? AP3X
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Answer:
S>0 contributes to spontaneity.
Explanation:
i just took the test on a pex :)
According to the law of thermodynamics, the relationship between entropy and the spontaneity of a reaction is S > 0.
What is entropy?Entropy is the total amount of energy in a closed system that is present there, but there are no uses for that energy. It is the unused energy for any work.
By the second law of thermodynamics, any spontaneous process results in an increase in the universe's overall entropy. The total of the entropy produced by the spontaneous process and the change in energy brought on by the heat flow is known as the net change in entropy of the system or S.
The reaction will be spontaneous if the delta G is negative. Delta G is the Gibbs free energy. So the entropy S will be greater that the reaction.
The Gibbs free energy equation is:
△G = △H − T△S
Thus, the relation is S > 0.
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20. Which of the following is the correct name for N205?
O nitrate oxide
O dinitrogen pentoxide
O nitrous oxide
O nitrogen dioxide
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Answer:
B!
Explanation:
Di stnds for 2 (N2)
pent = 5 (05)
What do plants do with sugar? *
Release it through their stoma
Eat it for energy
Convert it into oxigen
Convert it into water
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Answer:
its B .Eat it for energy.
How many pairs of electrons are shared by adjacent carbon atoms in an alkane?
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Answer:
one
Explanation:
A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy. The efficiency of the engine is
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A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy, then efficiency of the engine is 25%.
How do we calculate efficiency?We can calculate the efficiency by using the below equation as:
Efficiency = (Actual production / Theoretical production) × 100%
Given that,
Actual production = 604 kJ
Theoretical production = 2,416 kJ
On putting values in given equation, we get
Efficiency = (604/2,416) × 100% = 25%
Hence efficiency of the engine is 25%.
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When you mix water and salt you get a.
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what does climate change have to do with glacial change
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Answer:
Because glaciers are so sensitive to temperature fluctuations accompanying climate change. so if it gets hotter then the ice glaciers will melt.
Explanation:
Organisms that depend on other organisms for food are consumers. Which consumer you think is a herbivore (eats plants only)?
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Answer:
Prairie dog#3
Explanation:
:)
ILL MARK BRAINLIEST :)
Describe the law of conservation of mass in your own words *DO IT IN YOUR OWN WORDS PLEASE*
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Explanation:
According to the law of conservation of mass, mass can neither be created nor destroyed but it can simply be transformed from one form to another.
For example, [tex]Na^{+} + Cl^{-} \rightarrow NaCl[/tex]
Mass of Na = 23 g/mol
Mass of Cl = 35.5 g/mol
Sum of mass of reactants = mass of Na + mass of Cl
= 23 + 35.5 g/mol
= 58.5 g/mol
Mass of product formed is as follows.
Mass of NaCl = mass of Na + mass of Cl
= (23 g/mol + 35.5) g/mol
= 58.5 g/mol
As mass reacted is equal to the amount of mass formed. This shows that mass is conserved.
As a result, law of conservation of mass is obeyed.
True or False?
When it is summer in the Northern Hemisphere, it is summer all around the word
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how many carbon atoms are in 26-hydrogen alkyne
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Is this correct??Pls help!!!
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Answer:
C
Explanation:
Answer:
Yes, your answer is correct. B is correct :3
How many electrons does GeH4 have
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Ge has 32 electrons. H has 1 electron.
32 + 1(4) = 36
On the left a Circuit A, which is a square box. The top, left, and right sides have circles with X's in them. The bottom side has a stack of vertical lines, which are from left to right very short, short, very short, short. On the right a Circuit B, which is a square box. 2 extra lines cross the box near its top, parallel with the top side. The top side and the 2 extra lines have circles with X's in them. The bottom side has a stack of vertical lines, which are from left to right very short, short, very short, short.
Use the diagram and drop-down menus to answer each question.
Which circuit is a parallel circuit?
Which circuit is a series circuit?
In which circuit do the light bulbs all shine at their maximum brightness?
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Answer:
B A B sorry if its wrong
Explanation:
Circuits can be connected in series or parallel but the maximum voltage is obtained in series connection, thus, light bulbs shine brightest in series connection.
What is parallel and series connection in a circuit?A parallel circuit connection is one in which the terminals of all the components in th circuit meet at two points.
The components are parallel to each other and current flows in multiple directions.
A series connection in a circuit is one in which the terminals of the component parts in a circuit are joined end to end. Current flows in one direction.
The voltage in a series connection is the sum of all the individual cells, therefore, the light bulb in series connection shines brightest.
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How do textbooks usually describe Le Châtelier's famous principle
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Answer:is an observation about chemical equilibria of reactions. It states that changes in the temperature, pressure, volume, or concentration of a system will result in predictable and opposing changes in the system
Explanation:
If I have 6 moles of a gas at a pressure of 10.6 atm and a volume of 48 liters, what is the temperature of this gas?
An unknown quantity of gas is at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of 97 0C, how many moles of gas exist in this situation?
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Answer: 1). The temperature of this gas is 1032.88 K.
2). There are 21.48 moles of gas exist at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of [tex]97^{o}C[/tex].
Explanation:
1). Given: No. of moles = 6 moles
Pressure = 10.6 atm
Volume = 48 L
Formula used to calculate temperature is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 atm
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\10.6 atm \times 48 L = 6 mol \times 0.0821 L atm/mol K \times T\\T = \frac{10.6 atm \times 48 L}{6 mol \times 0.0821 L atm/mol K}\\= \frac{508.8}{0.4926} K\\= 1032.88 K[/tex]
Hence, temperature of this gas is 1032.88 K.
2). Given: Pressure = 14.5 atm
Volume = 45 L
Temperature = [tex]97^{o}C = (97 + 273) K = 370 K[/tex]
Formula used to calculate number of moles is as follows.
[tex]PV = nRT\\14.5 atm \times 45 L = n \times 0.0821 L atm/mol K \times 370 K\\n = \frac{14.5 atm \times 45 L}{0.0821 L atm/mol K \times 370 K}\\= \frac{652.5}{30.377} mol\\= 21.48 mol[/tex]
Hence, there are 21.48 moles of gas exist at a pressure of 14.5 atm, a volume of 45 liters, and a temperature of [tex]97^{o}C[/tex].
what is chemical bonding?
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Answer:
Chemical bonding - a mutual adhesion of atoms in an molecule and the crystal lattice.
Explanation:
Hope you have a great day
How many moles of NO are made from
mixing 7.2 moles of NH3 and 9.6 moles
of O? Identify the limiting reagent.
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Answer:
216 g of NO
Explanation:
We begin from the reaction:
4NH₃ + 5O₂ → 4NO + 6H₂O
We determine the limiting reactant with the moles of each reactant:
4 moles of ammonia react to 5 moles of oxygen
Our 7.2 moles of ammonia may react to (7.2 . 5) /4 = 9 moles
It's ok because we have 9.6 moles of oxygen. 0.6 moles still remain.
5 moles of oxygen react to 4 moles of NH₃
Our 9.6 moles of oxygen may react to (9.6 . 4) /5 = 7.68 moles
We only have 7.2 moles of NH₃ and we need 7.68; so there is no enough ammonia and that's our limiting reagent.
Now we determine the moles of product.
4 moles of ammonia can produce 4 moles of NO
Definetely our 7.2 moles, will produce 7.2 moles of oxide.
We convert to mass: 7.2 mol . 30 g/mol = 216 g