One kilometre equals to what centimeter ​

Answer:

51 protons, 51 electrons and 70 neutrons (in Antimony-171 isotope) It is in group 18 of the periodic table and is a noble gas.

Answer:

prototype

Explanation:

don't go right to designing the original thing

Answer:

A

Explanation:

Two specialized cells called 'guard cells' make up each stoma (stoma is singular for stomata). Plants have many stomata up to 400 per mm2 on their leaf surfaces and they are usually on the lower surface to minimize water loss.

Vertebrates are animals with a backbone (think vertebrae). These are the creatures we usually think of when we think of animals. Vertebrates have tremendous diversity in shape, size, ability, and characteristics. They are truly wondrous creatures! The 5 classes of vertebrates are:  

Fish, Amphibians, Reptiles, Mammals, and Birds.

All invertebrates obtain food differently, some have a mouth, and others have a beak. The eight different phyla are, Porifera, Cnidarians, Platyhelminthes, Nematoda, Annelida, Echinodermata, Mollusca, and Arthropoda.

Answer:

option A is correct answer of this question

hope it helps and your day will be full of happiness

The answer is A ¬ω¬

hope it helps and have good day (yes it's late and yes i do not care I'm doing it for points ×°×)

Answer: D. 239 g of [tex]Br_2[/tex]

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} KBr=\frac{356g}{119g/mol}=2.99moles[/tex]

The balanced chemical reaction is:

[tex]Cl_2+2KBr\rightarrow Br_2+2KCl[/tex]  

According to stoichiometry :

2 moles of [tex]KBr[/tex] produce =  1 mole of [tex]Br_2[/tex]

Thus 2.99 moles of [tex]KBr[/tex] produce =[tex]\frac{1}{2}\times 2.99=1.495moles[/tex]  of [tex]Br_2[/tex]

Mass of [tex]Br_2=moles\times {\text {Molar mass}}=1.495moles\times 159.8g/mol=239g[/tex]

Thus 239 g of [tex]Br_2[/tex] will be produced from 356 g of KBr.

Answer:primary consumer

Explanation:

i got it right

Answer:

i think it's C

Explanation:

Answer:

B. energy, but not matter

Answer: 3

Explanation:

3) both electrolytic cells and voltaic cells

The statement, that describes reduction occurs at the cathode is "both electrolytic cells and voltaic cells."

The gain of electrons is referred to as reduction. The species that is being oxidised is also known as the reducing agent or reductant, whereas the species that is being reduced is known as the oxidising agent or oxidant.

Reduction takes place at the cathode electrode whereas oxidation occurs at the anode in both galvanic and electrolytic cells, and electrons travel from the anode to the cathode.

Electrons must move toward the location of reduction since reduction is the addition of electrons. The negative charge is on the cathode of an electrolytic cell, while the positive charge is on the anode.

Hence, the correct answer is 3.

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Option B is the correct answer.

A disaccharide is a molecule which is made of two units of monosaccharide which is linked together by a glycosidic bond.

Example: Sucrose, lactose

Disaccharides, also called double sugar, is any substance that is composed of two molecules of simple sugars (monosaccharides) linked to each other. Disaccharides are crystalline water-soluble compounds.

Hence, option B is the correct answer.

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Answer:

133.74 L

Explanation:

First we convert the given pressures and temperatures into atm and K, respectively:

Then we use the PV=nRT formula to calculate the number of moles of helium in the balloon, using the data of when it was on the ground:

Then, knowing the value of n, we use PV=nRT once again, this time to calculate V using the data of when the balloon was high up:

Bond polarity and ionic character go hand in hand: We can say that polarity and ionic character are positively correlated. The classical way to determine either is to compare the electronegativity difference (ΔEN) between the bonding atoms. The greater the difference in electronegativity, the larger the dipole moment, the greater the polarity, and the greater the ionic character of the bond.

The Pauling electronegativity scale, which should be provided in most chemistry texts and is certainly available online, can be used to determine ΔEN. As a very general rule of thumb, an ΔEN that is equal to 2.0 or greater indicates an ionic bond. We don't have to worry about that here, though, since we're only interested in polarity. But this is just some conceptual relation to consider; indeed, ionic bonds can be seen as very polar covalent bonds (or covalent bonds with significant ionic character).

There is no known bond that has a 100% ionic character (ΔEN = 4), i.e., a purely ionic bond. But there are many bonds that we know of with 0% ionic character (ΔEN = 0), i.e., a completely nonpolar bond. We can think about this logically without even knowing specific electronegativity values: If the difference in electronegativity between two bonding atoms is 0, then the two atoms must have equivalent electronegativities. And when can this be the case? Well, atoms from the same element have the same electronegativity. So one case of completely nonpolar bonding would be covalent bonding between atoms of the same element.

In the question given, there are two such cases: P4 and Br-Br. P4 is a tetrahedral molecule composed of four covalently bonded P atoms, each one bearing a lone electron pair and bonded to the other three. With each P having the same electronegativity (ΔEN = 0), no P-P bond in P4 has a dipole moment, and the P4 molecule itself is nonpolar. Br-Br is how bromine is found naturally (as diatomic Br₂); since this is a covalent bond between the atoms of the same element, the ΔEN = 0 and there is no dipole moment. A bromine molecule is completely nonpolar.

Fluorine (F) has the greatest electronegativity among the elements, so whether the Te-F or the Cl-F bond has the greater polarity (i.e., the greater ΔEN) really depends on the electronegativity of Te and Cl.

But let's think about this first. Both Cl and F are halogens; Cl is in the period right below F, and, following periodic trends, Cl itself is quite electronegative. Generally, nonmetals don't form ionic bonds with each other (the underlying reason is complicated and not relevant here, but that notion agrees with ΔEN between any two nonmetals being less than 2.0). Nonmetallic elements can form very polar covalent bonds whose ΔEN is very close to 2.0, however.

Tellurium (Te) is a metalloid that is three periods below F. Electronegativity generally decreases as you go down a group. Even though Te and Cl are not in the same group, the fact that Te is two periods below should give a strong presumption that Te has a lower electronegativity than Cl. Moreover, electronegativity increases you move left to right on the periodic table (that is, as the group number increases); Te is in a group to the left of fluorine's and chlorine's. So, using periodic trends alone, we know that Te is in a group to the left of and below that of Cl, both of which trend toward decreasing electronegativity. Thus, it would be reasonable to assume that Te would have a smaller electronegativity than Cl. And so, the ΔEN of Te-F > ΔEN of Cl-F, which means the Te-F bond should have the greater polarity. And, indeed, this is true using the Pauling scale: The EN of F is 4.0; the EN of Cl is 3.0; and the EN of Te is 2.1.

In all, given that the ΔEN of P-P = 0; ΔEN of Br-Br = 0; ΔEN of Te-F = 1.9; and ΔEN of Cl-F = 1.0; the Te-F bond has the greatest polarity.

Answer:

1.306 × 10^24 formula units.

Explanation:

The chemical equation of this qkrstios as follows:

Fe + 2H2O → FeO2 + 2H2

Based on the reaction, 2 mole of H2O produces 1 mole of FeO2

Using the formula as follows;

Mole = mass/molar mass

Molar mass of H2O = 1(2) + 16 = 18g/mol

mole = 78/18

mole = 4.33moles

If 2 mole of H2O reacts to produce 1 mole of FeO2

4.33 moles of H2O will produce 4.33/2 = 2.17moles of FeO2.

To convert moles to formula units, we multiply number of moles by Avagadro number (6.02 × 10^23 units)

= 2.17 moles × 6.02 × 10^23 units

= 13.06 × 10^23

= 1.306 × 10^24 formula units.

Answer:

Convex

Explanation:

8 guess not sure cause light rays should be converging to meet to their eye

Answer:

pertane the stronger the force the larger amount of energy needed to break of the connection between the molecules

Answer:

31.Microbial

32.Coke is a grey, hard, and porous fuel with a high carbon content and few impurities, made by heating coal or oil in the absence of air—a destructive distillation process. It is an important industrial product, used mainly in iron ore smelting, but also as a fuel in stoves and forges when air pollution is a concern.

33.examples to show that plastics are non corrosive in nature: Iron nails get rusted when exposed to moisture and air but plastic do not react with water and air. Plastic does not react with strong chemicals. Hence,cleansing chemicals are stored in plastic bottles and not in metal containers.

34.rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulfur and nitrogen oxides, which combine with atmospheric water to form acids.

35.in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages.

38.a medical condition in which the lens of the eye becomes progressively opaque, resulting in blurred vision.

Explanation:

Hope it helps!

Answer:

38 g

Explanation:

I think thats the answer in your question

Answer:

19.37g

Explanation:

1 mole CH4 gives 4 mole CO2

so 58 g gives 176 g CO2

(58/176)×58.8 g CH4 gives 58.8 g CO2

Answer: A.Naci

Explanation:

Table salt is made from a combination of atoms of sodium (Na) and chlorine (Cl) in a ratio of 1:1 forming the compound NaCl.

Answer:

26.795229

Explanation:

This is how much it is

Answer:

3

Explanation:

Answer: 13.4

Explanation: i guessed it and got it correct on ck-12

STP is the standard pressure and temperature condition of the ideal gas. 0.13 moles of dinitrogen monoxide will be present at STP.

An ideal gas equation is a relation between the pressure, volume with moles, gas constant, and the temperature of the ideal gas. The ideal gas equation is given by,

[tex]\rm PV = nRT[/tex]

Given at STP,

Pressure = 1 atm

Volume = 300 L

Moles = ?

Gas constant =8.3144598 J per mol per Kelvin

Temperature = 273 K

Substituting values in the ideal gas equation we get:

[tex]\begin{aligned} \rm n &= \rm \dfrac{ PV}{RT}\\\\&= \dfrac{1 \times 300}{273 \times 8.314}\\\\&=0.1321\end{aligned}[/tex]

Therefore, 0.13 moles of dinitrogen monoxide are produced at STP.

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Answer: gravity wind and water density or surface currents

Explanation:

Hope this helped

When there are three varieties of feather color in one species of bird, then it is an example of genetic diversity. Therefore, option C is correct.

Genetic diversity refers to the variety of genetic information among individuals of the same species. This diversity can be observed in the differences in genes, alleles, and genetic traits within a population.

Genetic diversity is important because it allows species to adapt to changing environments. It increases their chances of survival. It also helps to maintain a healthy population by reducing the likelihood of genetic disorders and diseases.

Genetic diversity can be influenced by various factors such as mutation, gene flow, genetic drift, and natural selection. Thus, otpion C is correct.

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Answer:

i am unsuree

Explanation:

Answer:

1 1/2 Grams

Explanation:

If one gram of Rainbowium-214 has a half-life of 20 minutes, it takes 40 minutes for all of the grams to disappear. 2 grams of Rainbowium-214 will take 1hr and 20 minutes, but we only need to keep 1g safe for 1hr. If we used 1 1/2 grams, it would last a full hour, making the correct answer option 1 1/2 grams.

Answer: pH= 1

Explanation: pOH + pH =14