Which set of elements will have similar reactivity?

Answer: [tex]1.25dm^3[/tex] of unreacted oxygen is left.

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given volume}}{\text{Molar Volume}}[/tex]    

[tex]\text{Moles of} CO_2=\frac{3.60dm^3}{22.4dm^3}=0.161moles[/tex]

[tex]\text{Moles of} O_2=\frac{7.25dm^3}{22.4dm^3}=0.324moles[/tex]

[tex]C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(l)[/tex]  

According to stoichiometry :

3 moles of [tex]CO_2[/tex]  = 5 moles of [tex]O_2[/tex]  

Thus 0.161 moles of [tex]CO_2[/tex] =[tex]\frac{5}{3}\times 0.161=0.268moles[/tex]  of [tex]O_2[/tex]

moles of [tex]O_2[/tex]  left unreacted = (0.324-0.268) = 0.056

Volume of [tex]O_2[/tex] left unreacted = [tex]moles\times {\text {Molar volume}}=0.056mol\times 22.4dm^3/mol=1.25dm^3[/tex]

Thus [tex]1.25dm^3[/tex] of unreacted oxygen is left.

Answer:

122.5 Joule, or 122.5 j

Explanation:

Given,

mass of the object (m) = 5 kg

velocity of the object (v) = 7 m/s

Kinetic energy = [tex]\frac{1}{2}[/tex] × m × v²

Applying the formula:

Kinetic energy = [tex]\frac{1}{2}[/tex] × 5 × 7²

⇒ [tex]\frac{1}{2}[/tex] × 5 × 7 × 7

⇒ [tex]\frac{245}{2}[/tex]

⇒ 122.5 Joule, or 122.5 j

Kinetic energy is the energy that an object gains as the result of the motion.  It also depends on the mass of the object and force with which the motion is applied.  In the given question, the mass of the object is 5 kg and the force of the velocity by which it is moving is 7 m/s.

Answer:

Each person has their own skill level. The smaller ramps are less risky and are for more beginner to amateur skaters. The larger ones are very risky but can be very nice if a person does tricks with it. They are geared for more experienced skaters. Different ramps allow for more people to hace fun skating without the risk of injury...

If Veronica spins in a circle with the compass in her hand, then the force which keeps the compass' needle pointing north is magnetic field.

The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. In a magnetic field, a moving charge receives a force that is perpendicular to both its velocity and the magnetic field.

Hence the required force is a magnetic force.

To know more about magnetic forces, visit the below link:

https://brainly.com/question/14411049

#SPJ2

Answer:

a. 0.78%

Explanation:

Given data:

Total percentage of hydrosphere = 2.5%

Percentage of ground water = 31%

Percentage of hydrosphere we use for drinking = ?

Solution:

Percentage of hydrosphere we use for drinking  = Percentage of ground water /100 × Total percentage of hydrosphere

By putting values,

Percentage of hydrosphere we use for drinking = 31 / 100× 2.5

Percentage of hydrosphere we use for drinking = 0.78%

Answer:

1.p=mV................

Answer:

heat and large amount of surface area

Explanation:

the heat and surface area allows the iron in the wool to combine with oxygen. by doing this it increases the mass of the steel wool

The mass of steel wool increases after burning because it reacts with oxygen in the air, leading to the formation of iron oxide.

After burning, steel wool's bulk grows due to the oxidation process. Iron oxide, also referred to as rust, is created when steel wool burns when it comes into contact with oxygen from the air.

The steel's iron reacts chemically with the oxygen to create iron oxide, which is heavier than the original iron. As a result of going through the oxidation process and becoming iron oxide, steel wool gains bulk.

Learn more about oxidation, here:

https://brainly.com/question/13182308

#SPJ6

Answer:

Explanation:

The metal zinc readily reacts with hydrochloric acid to produce hydrogen gas (H2) and zinc chloride (ZnCl2). Every chemical reaction either produces or absorbs heat. In chemistry this effect is described as the reaction enthalpy. The zinc reaction produces the heat and hence has the negative enthalpy.

Plz mark me brainliest

Answer:

3

Explanation:

On the left side we have 3 Calcium atoms and 6 fluorine atoms

that means there need to be the same number on the right side

in the CaF2 molecules we already have 2 fluorine atoms so by multiplying with 3 we get 3 Ca and 6F

Answer: 2. with two symmetrical shells - mirror images of each other.

the term "crinoid" means: 6. phylum where starfish and sea urchins belong

4. lived inside their shells: 1. exoskeletons are made up of this material

7. multicellular organisms that often live in colonies:  8. individuality of coral is called

Explanation:

Crinoid is a term that can be used to describe the radial symmetry of animals that have oral (side of mouth) and aboral surfaces (opposite to the mouth). It is characterized by the mouth at the top surface and surrounded by the arms for feeding it. This is a characteristic feature of animals like star fish and sea urchins and echinoderm animals.

The exoskeleton is a protective shell which protect the animal from the external environment like water, sunlight and predation.

The multicellular organisms that live in the colonies they form coral reef and individually the are called the coral polyp.

Answer:

about 30 meteor showers

Explanation:

Answer:

When our bodies are dry and wind blows by, we lose some energy to the air molecules. When are bodies are wet, we have a substance on our skin that likes to absorb heat. So when wind blows by, we lose a LOT of energy to the air molecules. When the body loses heat energy, our body temperature drops.

Explanation:

hope it helps

plzz mark it as brainliest...

Answer:

a-72.8213 mol

b-32 atoms

c-81736.817291 mol

d-62/7362 (ohms law)

I =q/t

Answer:

C. ribosomes

Explanation:

Both prokaryotic and eukaryotic cells contain certain structures called ORGANELLES. They possess some in common and others are not found in one or the other. According to this question, a small, free-floating organelle made from nucleic acid and amino acid is found in both eukaryotes and prokaryotes. This organelle is RIBOSOMES.

Ribosomes are organelles responsible for the synthesis of protein in both eukaryotes and prokaryotes. They can be found free-floating or attached to endoplasmic reticulum. Ribosomes are predominantly made of RNA (nucleic acid) and proteins i.e. Ribosomal RNA (rRNA) and proteins is their structural constituent. Hence, the organelle in this question is RIBOSOME.

Answer:

1533.6 kg NO

Explanation:

The reaction that takes place is:

First we convert the masses of ammonia (NH₃) and oxygen gas (O₂) into moles, using their respective molar masses:

77.5 kmol of O₂ would react completely with (77.5 kmol O₂ * [tex]\frac{4kmolNH_3}{5kmolO_2}[/tex]) 62 kmol of NH₃. There are not as many kmol of NH₃, so NH₃ is the limiting reactant.

Now we calculate how many kmol of NO are produced, using the limiting reactant moles:

Finally we convert kmol of NO to mass, using its molar mass:

Answer:

I think your answer is either b or c but I think b is more likely to be your answer

Explanation:

A chemical reaction where two chemical compounds exchange ions with each other is called a double displacement reaction.

Also, when an insoluble salt is formed due to chemical reaction between two chemical compounds is called a precipitation reaction.

For example, [tex]NaCl(aq) + AgNO_3(aq) \rightarrow NaNO_3(aq) + AgCl(s)[/tex]

Here, ions are exchanged between the compounds [tex]NaCl[/tex] and [tex]AgNO_3[/tex] . Also, [tex]AgCl[/tex] is the precipitate formed.

Answer:

2

Explanation:

Answer:

2H3[PO4] —> H4[P2O7] + H2O

Explanation:

Explanation:

The molecules in the solute and solvent are only able to make dispersion forces with each other (as they aren't both polar). This only releases very little energy. Therefore overall, more energy is required than released and hence they won't mix.

Answer:

Matter is anything that has mass and takes up space.I think there is takes up already synonym to occupies.

Answer: Mg and Ca

Explanation:

In the modern periodic table, Mg and Ca are the last pair of elects for which Newlands' Law of Octaves would hold true.

Law of Octaves is the generalization that was made by Newlands. It states that when chemical elements are arranged based on their increasing atomic weight, then the ones that have the same chemical and physical properties will occur after an interval of seven elements.

In such a case, every eighth element will have identical properties when the elements in the periodic table are arranged based on their atomic masses.

Based on the above information, Magnesium (Mg) has an atomic number of 12 while Calcium (Ca) has an atomic number of 20. Therefore, the elements follow the law of Octaves as they have a difference of 8 in their atomic numbers.

Read related link on:

https://brainly.com/question/16430105

Answer:

here is the answer

Explanation:

The epididymis

Answer:

Vas deferens.

Explanation:

A long tube that is located near each testicle. The epididymis is the tube which moves the sperm from the testicles. Vas deferens. This is a tube in which the sperm is stored and it carries the sperm out of the scrotal sac.

Answer:

state symbol meaning

[s] solid

liquid

gas

aq] aqueous dissolved in water

Explanation:

often chemical equations are written showing the state that each substance is in. the [s] sign means that the compound is a sold. the l sign means the substance is a liquid. the aq sign stands for aqueous in water and means the compound is dissolved in water

thank me later.

Answer:

Explanation:

To construct an angle of 130 degrees;

The first thing to do is to bisect a given line segment.

Let's say we measure an even straight line A to B. Line A to B is assumed to be 10 cm. Then, we will choose any convenient radius and draw an arc at A and B.

Then, we proceed by draw arcs to cut each other at P and Q. Join |PQ| to cut |AB| at R. R is the midpoint of |AB|.

After, we bisect a given line segment where point R which is half of line AB.

Using the R to B side;

Then, we place our protractor at R; Starting from zero degrees with the horizontal line (parallel to side B) . we mark out angle 130°  after we have counted all the way from 0°  to 130°. At 130°, we mark out the point (X) on the paper and draw the extended line till it joins at R.

The angle from B to X is angle 130°

Answer:

are very reactive

Explanation:

Answer:

Ions are atoms that have either gain or lose electrons from the neutral atom.

A loss of electrons results in a positive ion, called a cation, a gain of electron results in a negative ion called an anion.

Ionic compounds are formed by the combination of a cation and anion, or metal + nonmetal.

When naming ionic compounds, name the cation first, and the anion second, changing the ending to ide.

Explanation:

Hope it helped!

Answer:

• [ lost ] or [ gained ]

• [ cation ], [ anion ]

• [ metal ] + [ non-metal ]

• [ cation ] and the [ anion ] to [ compound with suffix "ide" or "ode" ]

Answer:A

Explanation: yes

Explanation:   its c

becuase iknow

Answer:

1

Explanation:

Octet meaning 8. So if chlorine already has 7 valence electrons it will only need to get 1 more to be satisfied.