Why do trees produce carbon dioxide (CO2) at night?.
Answer:
Because photosynthesis ceases due to the lack of sunlight.
Explanation:
Plants typically absorb CO2 and release oxygen, but they also “exhale” CO2, particularly at night, when photosynthesis ceases due to the lack of sunlight. Forests also emit more CO2 when they are stressed by increasing temperatures.
What is the empirical formula of the polymer formed from ethene?
Answer:
C5H10
1-Propene, polymer with ethene | C5H10 - PubChem.
Explanation:
not sure.
Answer:
C5H10
Explanation:
1-Propene, polymer with ethene | C5H10 - PubChem.
Fatty acids that contain no carbon-carbon double bonds are referred to as.
Answer:
saturated fatty acids
The composition of blood is: 55% plasma, 45% formed elements. 45% plasma, 55% formed elements 50% plasma, 50% formed elements none of the above
Answer:
55% plasma, 45% formed elements.
Explanation:
Hope this helps!
Methyl hydrazine (N2H3CH3) is a common liquid propellant used in rocket fuels. Look for the standard molar enthalpies of formation of the reactants and products. Calculate the ∆H˚ for the reaction per mole of N2H3CH3.
4N2H3CH3(l) + 5N2O4(l) → 12H2O(g) + 9N2(g) + 4CO(g)
The standard enthalpy of reaction of the given reaction is -865.71 kJ per mole of N₂H₃CH₃.
What is the standard molar enthalpy of formation?The standard molar enthalpy of formation of a compound is defined as the enthalpy of formation of 1.0 mol of the pure compound in its stable state from the pure elements in their stable states at P = 1.0 bar at a constant temperature.
Let's consider the following equation.
4 N₂H₃CH₃(l) + 5 N₂O₄(l) → 12 H₂O(g) + 9 N₂(g) + 4 CO(g)
We can calculate the standard enthalpy of the reaction using the following expression.
ΔH° = Σnp × ΔH°f(p) - Σnr × ΔH°f(r)
where,
ΔH° is the standard enthalpy of the reaction.n is stoichiometric coefficient.ΔH°f is the standard molar enthalpy of formation.p are the products.r are the reactants.ΔH° = 12 mol × ΔH°f(H₂O(g)) + 9 mol × ΔH°f(N₂(g)) + 4 mol × ΔH°f(CO(g)) - 4 mol × ΔH°f(N₂H₃CH₃(l)) - 5 mol × ΔH°f(N₂O₄(l))
ΔH° = 12 mol × (-241.81 kJ/mol) + 9 mol × (0 kJ/mol) + 4 mol × (-110.53 kJ/mol) - 4 mol × (54.20 kJ/mol) - 5 mol × (-19.56 kJ/mol)
ΔH° = -3462.84 kJ
In the balanced equation, there are 4 moles of N₂H₃CH₃. The standard enthalpy of reaction per mole of N₂H₃CH₃ is:
-3462.84 kJ / 4 mol = -865.71 kJ/mol
The standard enthalpy of reaction of the given reaction is -865.71 kJ per mole of N₂H₃CH₃.
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Earths mantle is made of a dense thick material that allows movement of crystal plates. Crust plate movement occurs because the the mantle flows as a result of uneven heating inside the mantle. ________ are created by very hot material deep in the mantle rising then cooling sinking again and then heating again and then repeating the cycle
Answer:
Convection cells
Question 15 (5 points)
The maximum allowed daily dosage of Imitrex is 0.2 g. If tablets contain 25 mg, how
many tablets are able to be ingested in a day? Provide numerical values in standard
notation (not scientific notatio) not including units.
This problem is providing us with the maximum mass of Imitrex a patient can get daily as 0.2 g. Also, the mass of a tablet is given as 25 mg so the number of tablets they get in a day is required. After the calculations, the result turns out to be 10 tablets.
Dimensional analysis:In chemistry, dimensional analysis is used to calculate specific outcomes given useful information to do so. Despite not having specific formulas for every problem, one can come up with a feasible proportional-factor-based setup, in order to obtain the required.
In this case, since the mass per tablet is 25 mg, one can divide the maximum dosage by this mass per tablet, both in grams, to obtain the required number of tablets for a daily dosage:
[tex]25\frac{mg}{tablet}*\frac{1g}{1000mg}=0.025\frac{g}{tablet} \\\\\#tablets=\frac{0.25g}{0.025\frac{g}{tablet}} \\\\\#tablets=10 tablets[/tex]
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If you use 104 kiloliters of water per year, approximately how many liters of water do you use in a day?.
- Ibrahim and Emmanuel have been investigating the amount of copper sulfate that
can be dissolved in water at different temperatures. They added copper sulfate until
no more would dissolve and they carefully measured the mass of the copper sulfate
they added. Here are their results.
+ Temperature of water / °C
20
30
40
50
60
70
80
+Mass of copper sulfate dissolved / g
22
24
28
32
30
46
58
a. What is the range of temperatures that the boys used?
b. What interval did they use for the temperatures?
c. Name a variable the boys should have kept the same.
d. Which is the independent variable?
e. What conclusion can the boys make from their results?
The boys can arrive at the conclusion that as temperature increases, a greater mass of copper sulfate is dissolved in water.
What is an experiment?An experiment is a scientific investigation that seeks to obtain cause and effect relationships. There must be a dependent and an independent variable in every experiment.
The average of the temperature readings is; 20 + 30 + 40 + 50 + 60 + 70 + 80/7 = 50
They used an interval of 10 degrees for the temperature readings. The boys should have kept the heating time the same. The independent variable in this experiment is the temperature. The boys can arrive at the conclusion that as temperature increases, a greater mass of copper sulfate is dissolved in water.
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a. The range of temperatures that the boys used is 60.
b. The interval used for temperature = 10
c. Boys must have kept the amount of water same.
d. Independent variable is the amount of water.
e. The conclusion that can be made is the mass dissolved increases at higher temperature.
An experiment is a scientific investigation that seeks to obtain cause and effect relationships. There must be a dependent and an independent variable in every experiment.
An independent variable is the variable you manipulate or vary in an experimental study to explore its effects. It’s called “independent” because it’s not influenced by any other variables in the study.
A dependent variable is the variable that changes as a result of the independent variable manipulation. It’s the outcome you’re interested in measuring, and it “depends” on your independent variable.
Given,
a. Initial temperature = 20°C
Final temperature = 80 °C
Range = final temperature - initial temperature
= 80 - 20
= 60
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How many moles of water contain 1. 3 x 1024 molecules?.
Hope it helps.
If you have any query, feel free to ask.
Answer:
2.2 moles
Explanation:
right on test
Given what you now know about the action of cyanide on cellular respiration, explain why the patients died of lack of oxygen while their blood oxygen levels were normal?.
Given what we know, we can confirm that the patients will have died from a "lack of oxygen" even with normal blood oxygen levels due to the fact that cyanide blocks the function of oxygen in the body.
What does cyanide do?The main function of cyanide is that it blocks the oxygen from being used in the electron transport chain. This chain creates ATP, the energy needed for the body to complete any functions. Since the oxygen cannot be used despite it being present, the patients die of a lack of oxygen even with normal levels.
Therefore, we can confirm that the patients will have died from a "lack of oxygen" even with normal blood oxygen levels due to the fact that cyanide blocks the function of oxygen in the body.
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Use naming rules to explain why the following statement is not correct.
"The name of the formula PbCl, is lead tetrachloride".
This problem is providing us with a statement we need to disprove according to the naming rules for naming inorganic compounds. Thus, the correct name must be lead (IV) chloride, basically because it has a metal and a nonmetal.
Inorganic nomenclatureIn chemistry, naming chemical species is crucial in order to properly identify each chemical compound among the raft of chemical compounds in nature. Thus, nomenclature rules for compounds such as PbCl₄ demand us to identify their oxidation numbers:
[tex]Pb^{4+}Cl^-_4[/tex]
As they account for the name. Thus, since lead is a metal and chlorine a nonmetal, we must use the roman numeral-based nomenclature (stock) as lead has two oxidation numbers and we must distinguish between them.
Thereby, the name must be lead (IV) chloride and that is why the provided name, lead tetrachloride, is wrong as the systematic nomenclature (based on prefixes) applies for molecular compounds (nonmetal+nonmetal) only.
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What is the empirical formula for a compound if a sample contains 1. 0 g of S and 1. 5 g of O? SO SO3 S2O2 S2O3.
The empirical formula of the given compound is [tex]\bold{SO_3}[/tex].
The correct option is B.
What is an empirical formula?
The empirical formula of a chemical compound is the simplest whole-number ratio of atoms contained in the substance.
Given,
1.0 g of S
1.5 g of O
To calculate the empirical formula, we will divide the masses of the elements by their atomic weight.
For sulfur
[tex]\bold{\dfrac{1.0}{32} =0.03125\; mol}[/tex]
For oxygen
[tex]\bold{\dfrac{1.5}{16} =0.09375\; mol}[/tex]
Now, divide the greater value of mole came by the smaller value
[tex]\bold{\dfrac{0.09375\; mol}{0.03125\;mol} = 3}[/tex]
Thus, the empirical formula for the given compound is 1 for S and 3 for O
[tex]\bold{SO_3}[/tex]
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Mia has been learning about the ways scientists study rocks and how they determine their relative ages.
She enjoys studying fossils. She learned how fossils called index fossils are found in the rock layers. The index fossils help scientists study rock ages. In what way do index fossils help determine rock ages?
Answer:
The shapes and lines they hold within the rock. Rocks can simply be regenerated and melted back into a new and different form. Lines and texture usually prove how old the rocks are.
Explanation:
I hope this helps and I'm sorry if it's wrong! <3
After finishing a lab, you have some chemicals left over. You do not want to waste
them, so you carefully pour them back into the container you got them from.
Answer:
Instead, pour a small amount into a beaker or clean weigh dish. Once you have added a chemical to a container, label it promptly. When you are finished with the experiment, dispose of the excess chemical as chemical waste. Do not simply pour the excess chemical down the sink.
What is the density of water in grams per milliliter.
Answer: about 1 gram per millimeter :) It can change based on temperature, however
Explanation:
Researched on the internet
Heat is transferred in there ways wat and wat ???
Answer:
Radiation
Conduction
Convection
Explanation:
Radiation: Transfer of heat by electromagnetic rays (Example: A microwave heating food)
Conduction: Transfer of heat energy from one object to another through direct contact (Example: Getting out of bed and your warm feet touch cold tile, making the tile warm and your feet cold)
Convection: Movement of heat by a fluid such as air or water (Example: A convectional oven works by heating the air inside the oven to evenly cook food)
Hope this helps!
What type of bond involves the unequal sharing of electrons.
Answer:
Polar covalent bond
Jose and Denise are having a conversation about mechanical energy. Jose
says that mass has no affect on an object's potential energy. Denise
disagrees and believes that mass does have an affect on an object's
potential energy.
The mass of the body affects the potential, energy.
What is mechanical energy?The mechanical energy is energy possessed by a body by virtue of its position or its state of motion. There are two kinds of mechanical energy;
Kinetic energypotential energyThe potential energy is given by; PE = mgh hence the mass of the body affects the potential, energy.
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Calculate the total number of protons, neutrons, and electrons for Bromine (Br).
Answer:
protons=35 neutrons=44.9 electrons=35
Explanation:
Developing Mastery
Which state of matter has the most kinetic energy?
Liquid
Gas
Solid
which two practices are examples of how people use sciense
Answer: A: Explaining natural events using facts and data AND B:Developing theories using many lines of evidence
Explanation: trust me.
All the chemical reactions that occur in a cell are called.
What sequence of bases on the strand of DNA is complementary to the sequence TATGCAT on another strand?
Explanation:
Predicting the Complementary Base Sequence Worked Examp in Double-Stranded DNA 28. What sequence 0f bases strand of DNA is complementany t0 the sequence TATGCAT on another strand? sratec Remembertnat and form complementary painswith and respecinely. andtheng0 through the sequence replacing 4 by L.Gby C Tby Aand Cby 6.Rememberalso that the end on the left andthe 3' endis on the right in the original strand: Solutlon Original: (52 TATGCAT () Complement () ATACGTA (5)
What do you observe at the bottom of the test tube after heating?
Answer:
If you heat the test tube from the bottom, any liquid can turn into a gas. The gas will rapidly expand shooting heated liquid out of the test tube like a cannon. ... Accidents happen even heating the test tube gently at an angle can result in heating liquid being shot out of the test tube
Avogadro's number represents the number of units in a mole. What is this value?
Answer:
The value for Avogadro's number is 6.02 × 10^23
Explanation:
[tex]{ \tt{6.02 \times {10}^{23} }}[/tex]
Which statement best describes the motion of the water molecules
when heat is added to the beaker?
Answer:
when heat is add to something that that odject gets hot or it turns into a gas or it milces
Explanation:
what effect does gravity have on stars?
Answer: creates the pressure to fuse atoms
Water has a unique property. Like most liquids, it becomes denser as it cools, but at 4°c it reaches maximum density. Solid ice is less dense than liquid water, which is why ice floats. How would this property protect aquatic life in a lake?.
This unique property of water protects the aquatic life in a lake because this unique property prevents the lower layer of water to become solid.
How the unique property of water protects the aquatic life?If this property does not exists in water then in very low temperature all the water will turn to solid and all the aquatic animals present in the deep layer of water will die so we can conclude that this property of water protects the aquatic life in a lake due to prevent the water to change into solid.
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What is the difference between alkalinity and basicity?.
