it is for science class please help answer the questions and fast . I will
mark brainliest but it has to be right.
Answers
Bioluminescence Imaging.
Explanation:
Bioluminescence is appealing as an approach for in vivo optical imaging in mammalian tissues because these tissues have low intrinsic bioluminescence; therefore, images can be generated with remarkably high signal-to-noise ratios. A variety of different bioluminescent systems have been identified in nature, each requiring a specific enzyme and substrate. Although the most commonly used bioluminescent reporter for research purposes has been luciferase from the North American firefly (Photinus pyralis; FLuc), useful luciferases have also been cloned from jellyfish (Aequorea), sea pansy (Renilla; RLuc), corals (Tenilla), click beetle (Pyrophorus plagiophthalamus), and several bacterial species (Vibrio fischeri, V. harveyi).
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Related Questions
31. Can two (or more) types of matter occupy the same space at the same time?
32. What is hardest state of matter?
33. What is the softest state of matter?
Answers
32. Solid state
33. Liquid state
A gas occupied 780.0 mL at a temperature of 30°C. Several days later, it was measured at
a temperature of 16°C.
What volume did the gas occupy under these new conditions?
Answers
Answer:
744.0 mL
Explanation:
Formula obtained from Charles Law :
⇒ [tex]\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }[/tex]
===============================================================
Given :
⇒ V₁ = 780.0 mL
⇒ T₁ = 30 °C = 303 K
⇒ T₂ = 16 °C = 289 K
=============================================================
Solving :
⇒ V₂ = 780 × 289 / 303
⇒ V₂ = 225420 / 303
⇒ V₂ = 744.0 mL (approximately)
A student dissolves powdered tea in water. How can the student separate the parts of the mixture?
Answers
Answer:
The student can evaporate the liquid water.
Explanation:
The student only mixed water with the powdered tea. Therefore, if the water is evaporated from the mixture, the student will be left with the tea mixture only.
a gas exerts a pressure of 1.00 atm at 273 K. At what tempreture the gas exerts a pressure of 4.00 atm.
Answers
Considering Gay-Lussac's law, a gas exerts a pressure of 4.00 atm at 1,092 K.
Gay-Lussac's lawGay-Lussac's law states that the pressure of a gas is directly proportional to its temperature: when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, gas pressure decreases.
Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T}=k[/tex]
where P= pressure, T= temperature, k= Constant
This law states that the ratio of pressure to temperature is constant.
Studying an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{P1}{T1}=\frac{P2}{T2}[/tex]
Final temperatureIn this case, you know:
P1= 1 atmT1= 273 KP2= 4 atmT2= ?Replacing in Gay-Lussac's law:
[tex]\frac{1 atm}{273 K}=\frac{4 atm}{T2}[/tex]
Solving:
[tex]T2\frac{1 atm}{273 K}=4 atm[/tex]
[tex]T2=\frac{4 atm}{\frac{1 atm}{273 K}}[/tex]
T2= 1,092 K
Finally, a gas exerts a pressure of 4.00 atm at 1,092 K.
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What kinds of solute particles are present in water solutions of electrolytes and no electrolytes?
Answers
Ion particles are present in water solutions of electrolytes while neutral molecules are present in case of non electrolytes.
What are electrolytes?Electrolytes are compounds that dissociate into ions when dissolved in a solution, resulting in the solution becoming conductive to electricity. These substances are usually made up of ionic compounds or acids that dissolve in water, producing positively and negatively charged ions. These ions can move freely within the solution and transport electric charge, thereby transforming the solution into a conductor of electricity.
What type of solute particles exist in water solutions of electrolytes?When we talk about water solutions of electrolytes, it's important to note that the solute particles are present in the form of ions. These ions are essentially atoms or molecules that have a net electric charge as a result of gaining or losing electrons. The presence of these charged particles allows for conductivity within the solution, making them capable of carrying an electric charge. Some common examples of electrolytes include table salt (also known as sodium chloride), acids, and bases.
What type of solute particles exists in water solutions of non electrolytes?When it comes to solutions in water that contain non-electrolytes, the solute particles are made up of neutral molecules or compounds that lack an overall electric charge and therefore, cannot facilitate electrical conductivity within the solution. Sugar, alcohol, and urea are a few examples of non-electrolytes.
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is there enough oxygen for complete combustion?
Answers
Answer:
Complete combustion occurs when there is enough oxygen to completely use up all the reactants. Incomplete combustion occurs when there is not enough oxygen resulting in the production of smoke, and less energy is produced when compared with complete combustion.
Identify the choice that best completes the statement or answers the question.
12 Julia is in a car with her farther. The car is undergoing centripetal acceleration. What is happening to the car?
F The car is changing direction at a constant speed.
G The car is changing direction and speeding up.
H The car is stopping suddenly.
I The car is slowing down.
Answers
Answer:
the car is slowing down l think so
What reactant concentrations, pressure and temperature conditions would favor the production of the substance that is underlined in each of the following equations. Make sure you address all three of the factors listed above for each equilibrium.
a) 2CO(g) + O2(g) <--> 2CO2 (g) + 167 kJ
b) Cu2+(aq) + 4NH3(aq) <--> Cu(NH3)42+(aq) + 42 kJ
c) 2HI(g) + 12.6 kJ <--> H2(g) + I2(g)
d) 4HCl(g) + O2(g) <--> 2H2O(g) + 2Cl2(g) + 113 kJ
e) PCl5(g) + 88 kJ <--> PCl3(g) + Cl2(g)
Answers
Answer:
a) Increase the pressure, Increase the reactants, Decrease the temperature
b) No effect on pressure, Increase the reactants, Decrease the temperature
c) No effect on pressure, Increase the reactants, Increase the temperature
d) No effect on pressure, Increase the reactants, Decrease the temperature
e) Decrease the pressure, Increase the reactants, Increase the temperature
I had to look up the questions online because you did not underline them properly, but yeah these should be the respective conditions for each equation
Increasing pressure shifts equilibrium to the side with the least amount of gas moles, decreasing pressure does the opposite
Increasing Reactants will cause more products to be made
Increasing temperature in an endothermic reaction will shift equilibrium to the right, and in the opposite direction if the reaction is exothermic (left)
Decreasing temperature in an endothermic reaction will shift equilibrium to the left, and in the opposite direction if the reaction is exothermic (right)
How is the delta H fusion used to calculate the energy released when a volume of liquid freezes
Answers
The ΔH fusion used to calculate the energy released when a mass of liquid freezes by using the formula Grams liquid x mol/g x ΔH fusion.
What is enthalpy?The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.
Heat of formation or enthalpy is given for any one mole of substance.
And it will be calculated for moles of gases as, so for this first mass will be converted into moles as-
n = W/M, where
W = given mass in grams
M = molar mass in g/mol
and then multiply the given moles by the enthalpy of formation of one mole.
Hence, Grams liquid x mol/g x ΔH fusion is used.
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Answer:
ANSWER
Explanation:
The diagram shows that the potential energy of the products is lower
than the potential energy of the reactants. Which type of reaction is
shown?
(Once it hits the top of the hill it says activation energy
Once it hits the bottom to the word products it says heat of reaction)
A: this is an exothermic reaction because the reactants have less energy than the products
B: this is an endothermic reaction because the reactants have more energy than the products
C: this is an endothermic reaction because the reactants have less energy than the products
D: this is an exothermic reaction because the reactants have more energy than the products
Answers
Answer: D
Explanation:
Name the molecule in the picture
Answers
Answer:
1,3 - dimenthylbenzene
Right option is (c).
Explanation:
⠀
⠀
As here in the figure, we can see the hexagonal shape with a circle inside it which depicts the benzene ring. And at 1 and 3 carbon atom, the methyl group is attach to the it.
⠀
It's formula will be
[tex] \sf C_8H_{10}[/tex]
It is also known as m-xylene.
⠀
And this organic compound is used in leather and rubber industries.
How is an unknown oxidation state of an element within a compound
determined?
O A. It will be the same in the products as in the reactants.
B. It will be the same as the charge on the compound.
C. It is always the same as the most likely oxidation state.
ОС
OD. It is determined from known oxidation states of other elem
Answers
Answer:
it is determined from known oxidation states of other elements
Evaluate what advantage Bronsted-Lowry base theory has over the Arrhenius base theory.
A) The Bronsted-Lowry bases can act as proton acceptors.
B) Bronsted-Lowry bases act as hydroxide ion acceptors.
C) Both hydroxide and hydronium ions are released as Bronsted-Lowry bases.
D) Hydroxide ions are the only Bronsted-Lowry bases produced in solution.
Answers
The advantage of Bronsted-Lowry base theory over the Arrhenius base theory is that the Bronsted-Lowry bases can act as proton acceptors.
What are Bronsted-Lowry bases?According to the definition of Bronsted-Lowry, a base is a proton acceptor. In that case, the concept of bases is not limited to only the hydroxide ions.
Thus the advantage of Bronsted-Lowry base theory over the Arrhenius base theory is that the Bronsted-Lowry bases can act as proton acceptors.
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Chemistry
Bellringer: Find the mass of 5.78 moles of carbon
dioxide.
Answers
Answer:
254.32
Explanation:
The formula to calculate mass is:
no. of moles ×molar mass. and the molar mass of carbon dioxide is 44
5. When calcium carbonate is heated, the following reaction occurs:
CaCOJ – CaO + COz (a)
The standard enthalpy of reaction for each substance is shown below.
Substance
AH, (kJ/mol)
-1206.9
-635.1
CO2 (9)
-393.5
What statements correctly classifies the decomposition of calcium carbonate
reaction?
CaCO3 (5)
CaO(s)
A-The reaction is endothermic because energy is released during the
reaction.
B-The reaction is endothermic because energy is absorbed during the
reaction.
C-The reaction is exothermic because energy is released during the
reaction.
D-The reaction is exothermic because energy is absorbed during the
reaction.
Answers
Answer:
B-The reaction is endothermic because energy is absorbed during the
reaction
Explanation:
CaCO3 -> CaO + CO2
endothermic means cooling
its decomposition of limestone to calcium oxide (quicklime) and carbon dioxide on heating
byjus
What is/are defined in elements of the same group?
A. Atomic stability
B. Electron configuration
C. Chemical/physical properties
D. Exponentially increasing atomic weight
Answers
Answer:
C
Explanation:
Elements in the same groups have similar chemical/physical properties. The reason the answer isn't electron configuration is that if this was the case, there would be no reason for transition metals to exist as they can have a varying amount of electrons in their outer shell.
For example, all alkali metals (Group 1) turn into positive ions when reacting and Halogens (Group 7) all turn into negative ions after reacting.
What are some applications of fission reactions? as a zero-waste energy source for generating large amounts of heat for creating stable elements from unstable ones for creating new, heavier elements as the energy source in nuclear weapons
Answers
Some of the applications of fission reactions are as follows:
for generating large amounts of heatfor creating stable elements from unstable onesas the energy source in nuclear weaponsWhat are nuclear fissions?Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
Nuclear fission involves the release of radioactive particles which causes a decrease in the number of atoms.
Nuclear fission have the following applications in industry:
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When the fish water had pH of 8.0, the hydronium ion concentration is 1.0x 10^-8 mole per liter. What is Hydornium ion con ent ration when water had pH of 7.0
Answers
The hydronium ion concentration when pH = 7 is : 8.75 * 10⁻⁹ mole/liter
Determine hydronium ion concentration when pH = 7
Given that :
pH = 8.0
Hydronium ion concentration = 1 * 10⁻⁸ mole/liter
Resolving the question
8.0 = 1 * 10⁻⁸ mole/liter
7.0 = x
therefore :
x = 7 ( 1 * 10⁻⁸ ) / 8.0
= 8.75 * 10⁻⁹ mole/liter
Hence we can conclude that The hydronium ion concentration when pH = 7 is : 8.75 * 10⁻⁹ mole/liter
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PLEASE HURRY AND CHECK IMMAGE. Predict the shape of the molecule.
0
H
H
A. bent
B. linear
C. trigonal planar
D. tetrahedral
Answers
Answer:
A. bent
Explanation:
According to the kinetic-molecular theory, the collision between two ideal gas particles is a result of
Answers
Answer:
Neither Attraction Nor Repulsion
Explanation:
To start off,
Kinetic Molecular Theory:
A theory that describes the behavior, interaction, and movement of gas molecules; based on the idea that particles of matter are always in motion; the relationship between the microscopic qualities and the macroscopic qualities of a gas.Repulsion:
Repulsion in chemistry stands for the force which exists between two bodies that have the same electric charge or the same magnetic polarity, this force tends to repel the bodies and separate them from each other.Attraction:
The attraction of the negatively charged electrons that are circling the nucleus and the positively charged protons that are inside the nucleus provokes a pill that creates a chemical bond.To finish,
Gas particles move at random, which means there are no attractive forces between them or in their surroundings. The entire kinetic energy of two particles is preserved when they collide.
Answer:
Neither attraction nor repulsion.
Explanation:
Just took the test!
What do you mean by cation and anion
Answers
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Cations are ions that has a positive charge on it, and since it's a positive charge, it means that the ion has more protons than the number of electrons.
On the same contray, Anions are negatively charged particles having more electrons than protons in it, and hence bearing a negative charge.
property : non - alike ions attract each other by electrostatic force.
Answer:
Cations are positively-charged ions.
Anions are negatively-charged ions.
Type the correct answer in the box. given: cac2 n2 → cacn2 c in this chemical reaction, how many grams of n2 must be consumed to produce 265 grams of cacn2? express your answer to three significant figures. the reaction requires grams of n2.
Answers
The amount, in grams, of [tex]N_2[/tex] that will be consumed to produce 265 grams of [tex]CaCN_2[/tex] will be 80.61 grams
Stoichiometric calculationFrom the equation of the reaction:
[tex]CaC_2 + N_2 --- > CaCN_2 + C[/tex]
The mole ratio of [tex]N_2[/tex] consumed to [tex]CaCN_2[/tex] produced is 1:1.
Mole of 265 grams of [tex]CaCN_2[/tex] = 265/92.11 = 2.88 moles
Equivalent moles of [tex]N_2[/tex] = 2.88 moles
Mass of 2.88 moles [tex]N_2[/tex] = 2.88 x 28.02 = 80.61 grams
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How many grams is 3.2 moles of water
Answers
Answer:
similarly 1 mole of water is equivalent to molecular mass of water x 3 that is 18x3=54 gram
Explanation:
Which of the following is true for a system at equilibrium?
Option 1- the rates of the forward and reverse reactions are equal, or option 2-The reactants have been completely used up?
Answers
Answer:
option 1
Explanation:
you can never have all your reactants used up coz it is not possible eg in space u only loose SOme of gravity
Balanced chemical equation for the combustion of biodiesel
Answers
The balanced equation for the combustion of biodiesel is CH₄ + 2O₂ = CO₂ + H₂O.
What is combustion reactions?Combustion reaction is the reaction in which a substance react with oxygen to produce energy and heat. It is an exothermic reaction.
The combustion of biodiesel with oxygen form carbon dioxide and water.
Thus, the balanced equation for the combustion of biodiesel is CH₄ + 2O₂ = CO₂ + H₂O.
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please help
Tare the balance. Place the wooden block on
the pan, and record the block's mass below. g
Answers
Answer:
the first question's answer is 10.7g and the follow up question is 47.7g.
Explanation:
it makes you drag the object onto the scale and then displays it on the green rectangle.
Why do ice cubes float to the top of a glass of water.
Answers
Answer:
Since the water is heavier, it displaces the lighter ice,
Explanation:
hope that helps
Which element is number 14 on the periodic table?.
Answers
Answer:
Silicon
Explanation:
When viewing the periodic table of elements and locating atomic number 14, you will find that the element present is Silicon (Si), of which is within the metalloid elemental group.
3. Which half-reaction equation represents reduction?
Answers
Answer:
Which half-reaction equation represents reduction?
answer is 2
Answer:
B CU2+ +2e- -> Cu
Explanation:
reduction means something opposite of the word
reduction means an electron is GAINED in the part before the arrow
it's the " + 2e- " part of the equation before the arrow or "->" part
oxidation is the LOSING of an electron so it would show up to the right of arrow or "->" of the equation as "+2e-"
both reduction & oxidation reactions are called "redox"
in a battery
anode is oxidation
cathode is reduction
anode is positive
cathode is negative electrode
decomposing compounds is electrolysis.
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formation of water: 2H2 + 102 --> 2H20
How many moles of H2O can be produced from 7 moles of H2?
Help me please Answer or I’ll report
Answers
Answer:
It takes 7 mol H2 to produce 7 mol H2O
Explanation:
In 2H2O, there's 2 moles of H2 for every 1 mol O2.
So, if oxygen is limiting you'd only be able to produce 2 moles of H2O. I don't know if the question implies that, so it could also be that 7 mol H2 makes 7 mol H2O. Sorry for the confusion, I hope it helps a bit
