How many mL of O2 at STP are produced from 1.5 g KClO3

Answer:

Magnesium in tube 3 and copper in tube 5 became compounds

If each of the test tubes contained a less reactive compound and a more reactive element or less reactive element and more reactive compound , in first case chemical change of displacement reaction will occur while in second case no reaction will occur as zinc exists as an element.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

Learn more about chemical change,here:

https://brainly.com/question/23693316

#SPJ5

Answer:

4.04433566 L (433566 repeating)

Explanation:

2.52 is divided by 28.6 is 0.0881118 (881118 repeating). multiply 0.0881118 (881118 repeating) by 45.9 to get 4.04433566 L (433566 repeating).

Answer:

Gas

Explanation:

Answer:

K2CrO4 (aq)

Explanation:

previous nect

Answer:

the answer is c hope this helps

Explanation:

N-O is the most polar without being considered ionic. Hence, option C is correct.

An ionic bond is formed by the complete transfer of some electrons from one atom to another.

Bonds between carbon and other elements such as oxygen or nitrogen are polar. The polarity of a bond depends upon the electronegativities of the bonded atoms.

Hence, option C is correct.

Learn more about ionic bonds here:

brainly.com/question/977324

#SPJ2

Answer:

c

Explanation:

metamorphic rocks

Answer:

C. Metamorphic

Explanation:

Answer:

w = -531 kJ

1. Work was done by the system.

Explanation:

Step 1: Given data

Step 2: Calculate the work done (w)

We will use the following expression.

ΔU° = q + w

w = ΔU° - q

w = 156 kJ - 687 kJ

w = -531 kJ

By convention, when w < 0, work is done by the system on the surroundings.

Answer:

CCl₄

Explanation:

The molecule with a tetrahedral molecular geometry is CCl₄.

We know this according the valence shell electron pair repulsion theory.

To have a tetrahedral shape, a molecule must be made up of 4 bond pairs and no lone pairs.

This is clearly exhibited in the compound given;

 The central atom has 4 valence electrons which is completed bonded by 4 chlorine atom.

There is no lone pair but we have 4 bond pairs and a tetrahedral shape is formed.

Answer:The elements in the first column of the Periodic Table (other than hydrogen) are known as Group 1A metals, or alkali metals. When you compare the chemical properties of these elements (lithium, sodium, potassium, rubidium, cesium, and francium), what you'll notice is that they are all remarkably similar.

Explanation:

Lithium, sodium, and potassium are the three elements from group number 1 of the periodic table that has similar chemical and physical properties, these group 1 metals are also known as alkali metals.

The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.

Group 1 metals, often known as alkali metals, are a trio of elements from the periodic table that have similar chemical and physical characteristics. They are lithium, sodium, and potassium.

Thus, Lithium, sodium, and potassium are the three elements from group number 1 of the periodic table that has similar chemical and physical properties.

To learn more about the atomic number from here, refer to the links;

brainly.com/question/14190064

#SPJ2

Answer:

It is a fair statement of fact

Explanation:

The statement is a fact that is unopinionated and it does not exaggerate details of the event it just states the fact without opinions or exagerrations. This is why its unbiased.

The statement that is given is free of bias because It is a fair statement of fact. The correct option is B.

A statement is affirmative that is proposed and based on facts or the condition of the situation. It is a declaration. Statements don't pose queries, issue requests, or issue directives. They are not exclamations, either.

Scientific statements are generally based on facts and true results that came from an experiment. Like the one here, about Mount Vesuvius.

The statement simply tells the truth without opinions or exaggerations; it is a fact that is opinionated but does not embellish the specifics of the occurrence. This is why it is objective.

Thus, the correct option is B. It is a fair statement of fact.

To learn more about the statement, refer to the below link:

https://brainly.com/question/24071808

#SPJ2

Answer:

One mole of sugar is a considered as atomic mass. The atomic mass of sugar is 342 g. Rate of 1 kg of sugar is 40 Rs. Thus, the rate of 342 gram of sugar= 40x342/1000 = 13.68 Rupees

Explanation:

Answer:

They contain oxygen

hope it helps

Answer: I believe it’s the second one

(F)

Explanation:

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{8.72 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.48504...[/tex]

We have the final answer as

Hope this helps you

Explanation:

Given parameters:

Mass  = 9.5g

Volume  = 2.1cm³

Unknown:

What kind of substance is this = ?

Solution:

To determine the kind of substance given, we need to find its density from the given parameters.

The density of a substance can tell us about such body.

Density is an intensive property and it is the mass per unit volume.

       Density  = [tex]\frac{mass}{volume}[/tex]

Now insert the parameters and solve;

    Density  = [tex]\frac{9.5}{2.1}[/tex]  = 4.52g/cm³

The substance will most likely be a solid.

Answer:

Cementation

Explanation:

Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place :)

Answer:

Coal

Explanation:

Coal is formed from plants trapped in dust and dirt for a long time, so coal would fit plant material, and it also takes a long time to make coal, that's why it will run out at some point

Answer:B. 0.05 mol/dm3

Explanation:

The hydrogen ion concentration in the solution is 2 mol/dm³

The correct answer to the question is Option D. 2 mol/dm³

We'll begin by calculating the molarity of the solution.

Volume = 25 cm³ = 25 / 1000 = 0.025 dm3

Mole of H₂SO₄ = 0.025 mol

Molarity = mole / Volume

Molarity of H₂SO₄ = 0.025 / 0.025

H₂SO₄(aq) —> 2H⁺(aq) + SO₄²¯(aq)

From the balanced equation above,

1 mole of H₂SO₄ contains 2 moles of H⁺.

Therefore,

1 mol/dm³ H₂SO₄ will also contain 2 mol/dm³ H⁺.

Thus, the concentration of Hydrogen ion in the solution is 2 mol/dm³

The correct answer to the question is Option D. 2 mol/dm³

Learn more: https://brainly.com/question/3655413

Answer:

Slower shutter speeds like 1/60 second and slower cause a blurring effect. If you want to take a picture using a slow shutter speed, it is best to mount the camera on a tripod and use image stabilization (such as SteadyShot® technology) to reduce the chance of any unwanted camera movement.

The first big effect of it is motion blur. If your shutter speed is long, moving subjects in your photo will appear blurred along the direction of motion. ... If you use an especially fast shutter speed, you can eliminate motion even from fast-moving objects, like birds in flight, or cars driving past.

Explanation:

Mass of carbon monoxide : 0.95 g

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Reaction

Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂

MW Fe₂O₃ : 159,69 g/mol

mol Fe₂O₃ :

[tex]\tt \dfrac{1.8}{159.69}=0.0113[/tex]

mol ratio Fe₂O₃ : CO = 1 : 3, so mol CO :

[tex]\tt 3\times 0.0113=0.0339[/tex]

mass CO (MW =  28,01 g/mol) :

[tex]\tt m=mol\times MW\\\\m=0.0339\times 28.01\\\\m=0.950~g[/tex]

Answer:

483 nm corresponds to blue light hence the complex will appear orange.

Explanation:

Using the formula;

E= hc/λ

Where;

E = energy of the photon

h = Plank's constant (6.6*10^-34Js)

c = Speed of light (3*10^8 ms-1)

λ = wavelength

λ = hc/E

λ = 6.6*10^-34 * 3*10^8/4.10×10^−19

λ = 4.83 * 10^-7 or 483 nm

483 nm corresponds to blue light

Using the colour wheel approach, if a complex absorbs blue light, then it will appear orange.

Answer:

The epic emotional journey of a suburban African American family as they navigate love, forgiveness and coming together in the wake of a tragic loss.

Explanation:

hope thsi helps if so please brainliest

Merry Christmas

Answer:

1. Elements

2. one

3. properties

4. Chemical

5. metal

6. non-metal

7. metalloids

8. Compounds

9. one

10. more

11. components

12. chemical process

Explanation:

In the given paragraph a brief about the difference between element and compound is given.

Elements are made up of the same type of atoms and each element is made up of one atom, that is they cannot be broken down into any other substance. Each element is different from each other due to its properties, though some have the same physical properties but are different in chemical properties.  Elements can be classified as metals such as iron and silver, non-metals such as oxygen and hydrogen, and metalloids such as boron and silicon.

Compounds are a combination of one or more elements such as water and salt. Compounds can be easily broken down into components through a chemical process.

Hence, the correct answer is:

1. Elements

2. one

3. properties

4. Chemical

5. metal

6. non-metal

7. metalloids

8. Compounds

9. one

10. more

11. components

12. chemical process

Answer:

237.8L of water would need to be added.

Explanation:

The first thing to do is to identify that the equation to be used is M1V1=M2V2. (This equation works because it turns everything into moles which can then be compared).

Then figure out what information you have and what is being found. In this case:

M1 = 54.7 M

V1 = 1092 mL = 1.092 L

M2 = 0.25 M

V2 = unknown

Then solve the equation for whatever you are trying to find.

M1V1=M2V2

V2=M1V1/M2

Now you need to plug everything in.

V2=(54.7M*1.091L)/0.25M

V2=238.93L

That means that the solution needs a volume of 238.7L to gain a molarity of 0.25M but the starting solution already had a volume of 1.092 L meaning that to find the amount of solvent that needs to be added you just subtract the starting volume by the volume that the solution needs to be.

238.93L - 1.091L = 237.8L

Therefore the answer is that 237.8L needs to be added to a 1.092L 54.7M NaCl solution to make the concentration 0.25M.

I hope this helps.  Let me know if anything is unclear.

Answer: the erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium. Brownian motion, or pedesis, is the random motion of particles suspended in a medium. This pattern of motion typically consists of random fluctuations in a particle's position inside a fluid sub-domain, followed by a relocation to another sub-domain. Brownian motion, also called Brownian movement, any of various physical phenomena in which some quantity is constantly undergoing small, random fluctuations. It was named for the Scottish botanist Robert Brown, the first to study such fluctuations (1827).

Hope this helps...... Stay safe and have a Merry Christmas!!!!!!!!! :D

Explanation:

Answer:

to and fro motion is called brownian motion

Answer:

[Ar] 3d¹⁰ 4s² 4p³

Explanation:

so...... ur welcome

Answer: A monopoly is the absence of competition in the market.

Explanation:

In such circumstances, the market creates a monopoly of one producer who takes huge capital and dictates prices. An example of a monopoly on the market is the existence of only one company that makes up the entire economic branch. In such circumstances, the monopolist can increase the product's price without losing the entire sale, i.e., operating successfully. In that situation, the monopolist remains the only one on the market, and the competition has no access to the market.