Which of the following is an indication of a chemical reaction?
freezing
melting
release of heat
all of the above

Answers

Answer 1

Answer:

All of the above

Explanation:

Their all chemical change


Related Questions

In the following closed circuit diagram it is found that the bulb doesn't glow. Explain with reason​

Answers

Answer:

No power - breaker, switch off or dead battery

Line voltage below minimum operable voltage (brownout)

Dimmer at minimum so 0% light

Switch/Dimmer faulty

A connection faulty between source of power and bulb

Failure in fixture (Lower Voltage transformer, overheat switch, driver)

Bulb not secured correctly - check base tab for being squished down and cleanliness

Fault in bulb

Safety triggered (overheated component shutdown item)

Name the enzymes and coenzymes that catalyze the process of catecholamines inactivation. Explain their mechanism of action.

Answers

Answer:

Coenzyme Definition

A coenzyme is an organic non-protein compound that binds with an enzyme to catalyze a reaction. Coenzymes are often broadly called cofactors, but they are chemically different. A coenzyme cannot function alone but can be reused several times when paired with an enzyme.

Functions of Coenzymes

An enzyme without a coenzyme is called an apoenzyme. Without coenzymes or cofactors, enzymes cannot catalyze reactions effectively. The enzyme may not function at all. If reactions cannot occur at the normal catalyzed rate, then an organism will have difficulty sustaining life.

When an enzyme gains a coenzyme, it then becomes a holoenzyme or active enzyme. Active enzymes change substrates into the products an organism needs to carry out essential functions, whether chemical or physiological. Coenzymes, like enzymes, can be reused and recycled without changing reaction rates or effectiveness. They attach to a portion of the active site on an enzyme, which enables the catalyzed reaction to occur. When an enzyme is denatured by extreme temperature or pH, the coenzyme can no longer attach to the active site.

Types of Enzymes

Cofactors are molecules that attach to an enzyme during chemical reactions. In general, all compounds that help enzymes are called cofactors. However, cofactors can be broken down into three subgroups based on chemical makeup and function:

Coenzymes

These are reusable non-protein molecules that contain carbon (organic). They bind loosely to an enzyme at the active site to help catalyze reactions. Most are vitamins, vitamin derivatives, or form from nucleotides.

A compound contain 31.9% potassium
(K) 23.93% cl and the rest oxygen
what is the chemical formula of the
compound
K=39
cl=35.5
O =16

Answers

Answer:

kclo2

Explanation:

the percentage can't be written on the equation

1. How many grams of sulfur dioxide could be formed when 299 grams of H2SO4 reacts?
____Cu + ____H2SO4 --> ____CuSO4 + ____SO2 + ____H2O

a 97.6 g
b 195 g
c 391 g
d 48.8 g

Answers

Answer:

cu+97.6g+48.8g

prabin Shrestha pyfhfugyyy

a
24. Noah is falling off a cliff. At the beginning of his fall, his velocity is 0 meters per second.
After 10 seconds, his velocity is 98 meters per second. What was Noah's acceleration?

Answers

Answer:

[tex]9.8ms^{-2}[/tex]

Explanation:

using the equation :

[tex]acceleration = \frac{final velocity - initial velocity}{timetaken} \\ a =\frac{v-u}{t}[/tex]

where v is 98m/s

u is 0m/s

t is 10seconds

[tex]a=\frac{98m/s- 0m/s}{10} \\a=\frac{98}{10}\\ a=9.8m/s^{2}[/tex]

If 8.6 grams of a certain fertilizer is found to contain 1.2 g of phosphorus is P205 what is the value of P in the N - P - K designation

Answers

Based on the mass given, the value of P in the N - P - K designation is 32.

What is percentage mass composition of an element?

The percentage mass composition of an element is the mass percent ofbthe element in the the total mass of the compound.

Since the fertilizer contains 1.2 g of phosphorus as P2O5.

Molar mass of P2O5 = 142 g

mass percent of P in P2O5 = 2 × 31/142 = 43.6%

mass of P2O5 in 8.6 g fertilizer = 100/43.6 × 1.2 = 2.75 g

Mass percent of P2O5 = 2.75/8.6 × 100% = 32.0%

Therefore, the value of P in the N - P - K designation is 32.

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-
C3H8 + _ 02 → _CO2 +_H2O
How many moles of O2 needed to make 3.3 moles CO2?

Answers

Answer:

1.1C3H8 + 5.5O2 --> 3.3CO2  + 4.4H2O

Explanation:

You insert the 3.3 next to CO2. The easiest now is to calculate the carbon on the reactant side.

You already have 3 carbon but need 3.3 so if you calculate 3.3/3=1.1

Carbons are now equal on both sides.

Now look at hydrogen. At the reactant side, you have 1.1*8= 8.8 of H.

You need to make equal on product side. do 8.8/2 =4.4 so you put the 4.4 in front of h2o.

last bit is oxygen. on the product side you have (3.3*2) +(4.4*1) = 11 oxygen.

You just need to make that equal on the reactant side now. you already have 2 oxygen so you times it by 5.5.

voila. hope you follow.

how many atoms are in the glucose chemical formula C6, H12, O6 ?

Answers

Answer:

6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms

24 atoms in total; six carbon atoms+twelve hydrogen atoms+six oxygen atoms=24 in total

What is the percentage composition of each element in dinitrogen monoxide, N2O? (4 points)

58.32% N; 41.68% O

60.55% N; 39.45% O

63.64% N; 36.36% O

62.66% N; 37.34% O


I think c

Answers

Answer:A.) 0

Explanation:

Dinitrogen oxygen ()

Valence electrons of oxygen = 6

Valence electron of nitrogen = 5

The total number of the valence electrons  = 2(5) + 6 = 16

The Lewis structure is drawn in such a way that the octet of each atom and duet for the hydrogen in the molecule is complete. So, The Lewis structure is shown in image below.

Formula for formal charge :

Formal charge for oxygen:

Answer:

63.64% N; 36.36% O

Explanation:

percentage composition of each element =

Atomic mass of element ÷ molar mass of compound

Nitrogen Atomic mass = 14u

N2 = 28u

molar mass of N20 = 44

28/44 = .6364 = 63.64%

Oxygen Atomic mass = 16u

0 = 16u

molar mass of N20 = 44

16/44 = .3636 = 36.36%

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Balance the following chemical equations.
A)Cu2O(s) + C(s) —--------> Cu(s) + CO(g)

B)H2(g) + Cl2(g) —---------> HCl(g)


Answers

A)Cu2O(s) + C(s) ———> 2Cu(s)+ CO(g)

B)H2(g) +Cl2(g)———> 2HCl(g)

pls help me who is good at science!!​

Answers

Answer: photosynthesis , pollination, decomposition

Explanation:

WILL GIVE FREE BRAINLIEST EVERYDAY! DO NOT look up answers!! PLEASE FOLLOW DIRECTIONS ON THIS & FUTURE QUESTIONS OR WRONG!!! Question: What is a lewis Dot model, what is its purpose. And what are some REAL LIFE scenarios it is used in. also give me a description of where the creator is from and their name

(this all the points i have rnn pl.z help a buddy out)

Answers

Answer:

What is a Lewis Dot Model?

A simplified representation of the valence shell electrons in a molecule.

What is its purpose?

To show how the electrons are arranged around individual atoms in a molecule.

What are real life examples?

The Lewis Structures helps us understand the bonding of atoms and the shapes of molecules and their chemical properties. And in real life the proteins we eat in food are the carbohydrates which is from chemical bonding, which we can learn through TLS.

Creator of Lewis Structure Facts-

Gilbert Lewis Newton and he is from Weymouth, Massachusetts

Explanation:

Hope this helps you.

Answer:

oh I can give you some points I have but I don't know how to can ya help?

Calculate the mass of an electron traveling at 2.95×10^8 ms if its wavelength is 1.30×10^−12 m. Use 6.626×10^−34kg m2s for Planck's constant.

Your answer should include three significant figures.

Answers

With the use of De Broglie equation, the mass of the electron is 1.73 x [tex]10^{-30}[/tex] kg

De Broglie Equation

De Broglie deals with wave - particle duality of some matter. He believe that particle can also exhibit wave properties.

According to De Broglie equation,

λ = h/p

Where

λ = wavelengthh = Planck's constantp = momentum

Given that an electron of wavelength 1.30×10^−12 m is traveling at 2.95×10^8 m/s . Use 6.626×10^−34kg m2s for Planck's constant.

The parameters are

λ = wavelength = 1.3 x [tex]10^{-12}[/tex] mh = Planck's constant = 6.626 x [tex]10^{-34}[/tex] v = velocity = 2.95 x [tex]10^{8}[/tex] m/sm = mass = ?

To calculate the mass of the electron, we will make use of de Broglie equation.

λ = h / mv

Make mass m the subject of the formula

mvλ = h

m = h/λv

Substitute all the parameters

m = 6.626 x [tex]10^{-34}[/tex] / (1.3 x [tex]10^{-12}[/tex])(2.95 x [tex]10^{8}[/tex])

m = 1.73 x [tex]10^{-30}[/tex] kg

Therefore, the mass of the electron is 1.73 x [tex]10^{-30}[/tex] kg

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what can u say about the sizes of all the atoms in a piece of carbon​

Answers

Answer:

all atoms must have 6 protons to be a carbon atom

Explanation:

brainliest?

Explain how the bonding models for sodium metal differ from the bonding model for sodium chloride

Answers

Answer:

See below.

Explanation:

Different types of bond models, different interactions of particles in the inner structures.

For sodium metal,

The basic particles, the unit, is metal sodium. So the interaction is originated from metal and metal. We call this interaction, metal, atom-atom interaction.

For sodium chloride,

The basic particles, is 2 different ionic particles, positive particle (sodium, Na+), and negative particle (chloride, Cl-). We call this interaction, ionic-ionic interaction.

So, different interactions, different structures, thus, finally, different binding models.

How does maximum boiling azeotropic mixture is separated using fractional distillation?

Answers

Answer:

By heating the mixture to maximum boiling point and then the solution is distilled at a constant temperature without having a change in composition.

Explanation:

An azeotropic mixture is also called a constant boiling mixture and it is a mixture of two or more liquids whose proportions cannot be altered by simple distillation due to the fact that when an azeotropic mixture is boiled, the vapor has the same proportions of constituents as the unboiled mixture.

Now, maximum boiling azeotropic mixture are the solutions with negative deviations that have an intermediate composition  for which the vapor pressure of the solution is minimum and as a result, the boiling point is maximum. At that point, the solution will distill at a constant temperature without having a change in composition.

Teeth and long bones are good indicators of age in children; ribs and joints are better for adults.
1. True
2. False

Answers

The answer is True not False

Hello I need help with this question

Answers

Deleted answer. ......

The particle diagram shown above represents the dissolution of CuCl(s) assuming an equilibrium concentration for Cu+ ions of about 4×10^-4M in a saturated solution at 25°C. The equilibrium being represented is shown in the following chemical equation.

CuCl(s)⇄Cu+(aq)+Cl−(aq)

Which of the following changes to the particle diagram will best represent the effect of adding 1.0mL of 4MNaCl to the solution?

A. Some of the Cu+ and Cl− ions combine to form CuCl(s) because the Ksp will be lower than 1.6×10−7.
B. Some of the Cu+ and Cl− ions combine to form CuCl(s) because the molar solubility will be lower than 4×10−4M.
C. More Cu+ and Cl− ions will be in solution because the molar solubility will be higher than 4×10−4M.
D. More Cu+ and Cl− ions will be in solution because the Ksp will be higher than 1.6×10−7.

Answers

Due to common ion effect, addition of 1.0mL of 4MNaCl  will cause some of the Cu+ and Cl− ions combine to form CuCl(s) because the Ksp will be lower than 1.6×10−7.

What is solubility product?

The term solubility product refers to the equilibrium constant that is set up when an ionic substance dissolve in water. Since the solution already contains chloride ions, addition of more chloride ions from NaCl will cause more CuCl(s) to separate from solution.

Hence, when 1.0mL of 4MNaCl is added to the solution, some of the Cu+ and Cl− ions combine to form CuCl(s) because the Ksp will be lower than 1.6×10−7.

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What type of packaging is used for milk? (represent
and compare in a table)
- How do the physical and chemical properties of each
packaging type help create new and better product?
(Material, reactivity with milk, oxygen etc.., shape,
hardness, color)
-What is the relationship between reactivity of material
type chosen and element position in the periodic table.
-Discuss the importance of packaging on human health
-Explain - Aluminum is a highly reactive metal, why is it
used for making cooking utensils?
Please answer this question ASAP

Answers

Aluminium can't react with any other substance due to not present in reactive form.

What types of packages used for milk?

Milk is packaged in a glass bottles, plastic coated paper board, blow mold nonreturnable polyethylene (PE) containers, plastic pouches, and returnable polycarbonate containers etc.

Aluminum is a highly reactive metal but it is used for making cooking utensils because it can't react with any other substance due to gaining of stability.

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fied the emicicol formula of a compoun containing
2.44% hydrogen, 39.02% sulphur, 58.54% oxygen

Answers

The answer is in the attachment below:

what is sewageband dirty amd water​

Answers

Answer:

Sewage is a liquid containing wastes from households, industrial and agricultural activities discharged into water and it is dirty water.

Based on what you know about matter explain why the food coloring mixes at different rates

Answers

Answer:

Matter has different densities. Different food colorings have different densities. Those with a higher density will sink to the bottom and mix much easier than one with a lower density. The higher density also contains more particles making it easier to mix or give it a fuller color.

What is the osmotic pressure of a solution of FeCl3(aq) in which 69.5 g of FeCl3(s) (molar mass = 162.20 g mol-1) are dissolved in a solution with a total volume of 2.35 L at 35.0 °C?

Answers

The osmotic pressure of the solution is 25.48atm

Data;

Mass = 69.5gMolar mass = 162.20g/molVolume = 2.35LTemperature = 35.0^oCOsmotic Pressure

The osmotic pressure of the solution is calculated as

[tex]\pi = iMRT[/tex]

i = Vant Hoff FactorM = molarityR = gas constantT = Temperature

The Vant hoff factor of the factor = 4

Let's calculate the molarity of the solution;

[tex]M = \frac{number of moles}{volume}[/tex]

Number of moles = mass / molar mass

[tex]n = \frac{mass}{molar mass} \\[/tex]

substitute the values into the formula and solve for it

[tex]n = \frac{69.5}{162.20} \\n = 0.428 moles[/tex]

The molarity of the solution is calculated as

[tex]M = \frac{number of moles}{volume} \\M = \frac{0.428}{2.35} = 0.182 mol/L[/tex]

The osmotic pressure of the solution is calculated as

[tex]\pi = iMRT\\\pi = 4 * 0.182 * 35\\\pi = 25.48 atm[/tex]

The osmotic pressure of the solution is 25.48atm

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What is the % of nickel in Ni3(PO4)2?

Answers

Answer:

it would be 98 precent ....

How to calculate molarity using solute moles

Answers

1: convert solution volume into liters if needed
2: divide moles by liters to get molarity
I hope this answers your question :) have a great day!

You need to make up 500.0 ml of .5750 m glucose (180.15g/mol). What is the mass of the glucose should you measure out

Answers

Answer:

Calculate the volume (in mL) of the 1.356 M stock NaOH solution needed to prepare 250.0 mL ... Glucose (molar mass=180.16 g/mol) is a simple, soluble sugar ... g of glucose in enough water to make 500.0 mL of solution. • Step 2: Transfer 18.6 mL of glucose

As per molar concentration, 51.79 g of glucose is required to make 500 ml of 0.5750 M glucose solution.

What is molar concentration?

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

In the given problem, mass of glucose is calculated from molar concentration as , molar concentration×molar mass×volume  in liters

On substitution, mass= 0.5750×180.156×0.5=51.79 g

Hence, 51.79 g of glucose is required to prepare 500 ml  of 0.5750 M glucose solution.

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Which element do plants need a lot of in order to go?

Answers

Plants need nitrogen to grow.

How does an atom become a positively charged lon?

A. by gaining one or more electrons
B. by gaining one or more neutrons
C. by losing one or more electrons
D. by losing one or more neutrons​

Answers

Answer:

your answer would be C

Explanation:

atoms that picks up the extra electron becomes a negatively charged ion (anion)

if we reverse that,

it would be a positively charged ion due to losing an electron

79. Explain why the production of a gas does
not always mean that a chemical reaction has
occurred.

Answers

Is evaporation of water considered a chemical reaction? No because it’s a physical change. Some reactions have gases as a product and some do not. Just because there’s a gas doesn’t mean a chemical reaction has occurred.
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