why does iodine have a lower atomic mass than tellurium

Answer:

8

Explanation:

It increases going up, because atom size is smaller, with greater energy levels; going right to left decreases, because they will have smaller charges when going through right to left.

Then, Calcium (Ca) is non-metal that reacts with Nitrogen (N), a non-metal. When 2 non-metal elements become a compound, it's covalent. Therefore, the bond between both of the elements are covalent.

The incorrect grouping of elements is Argon, potassium, slicon, strontium.

Periodic table is a systematic arrangement of chemical elements within the coloums and rowns on the basis of their properties.

In all options given elements belongs from the same group except the first one, beacuse in argon, potassium, silicon & strontium all are present in different groups of periodic table. As argon is present in the 18th group, potassium is present in the 1st group, silicon is present in the 14th group and strontium is present in the 2nd group of the periodic table.

Hence, correct option is (A).

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Which of the flowing painting did Miss meacham set up against the bread counter?

Answer:

Explanation:

Explanation:

Silver is a chemical element with the symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.

Answer:

microbial growth

Explanation:

food that is not properly kept at a proper temperature bacteria will grow causing spoilage

Answer:

Explanation:

I hope you help by my answee

Answer:

helium

Explanation:

The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

Answer: 2nd answer " C "

Explanation:

First ionization energy is a periodic trend that increases up and to the right on the periodic table. After looking at the position of these elements on the periodic table, carbon is clearly the best answer-choice (B) aka " C "

Answer:

For your first one it is C and your second one is D how deep is the lake.

Its going to be disicult to swim down at the bottom of a lake with all your class just to see how deep it is, so its better to make a model

Answer:

a:It is used as a moisturizer

b:Paraffin

c:Dissolve substances

d:Chemical distillation

e:Paper chromatography

Answer:

It's from the quation:

[tex] \boxed{ \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }}[/tex]

(How did I know?)

I learnt it while studying the elements of group 1.

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K, here, is Potassium. It's position in the periodic table is Group 1, Period 4.

Valance electrons of elements of this group contribute to the valency of the group's elements I.e.,

valency of Alkali metals is 1!

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What are hydroxides?

Hydroxides of an element comprises one atom each of oxygen and Hydrogen bonded together, acting as an anion, the hydorxide anion — OH-.

Example:

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In the question, The reactants are missing but the products are known, that are, Potassium Hydroxide and water.

Keeping the above mentioned property in mind, the reactants come clear as Potassium(K) and Cold water(H2O).

that makes the equation:

[tex] \mathsf{K + H_2O \rightarrow \: KOH + H_2 }[/tex]

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For an equation to be balanced, the number of atoms of each elements on both side of the equation must be equal.

Number of atoms of each element on the LHS:

(subscript in front of an atom represents its number of atoms in the compund)

Number of atoms of each element on the LHS:

The number of Hydrogen atoms on boths sides is NOT balanced!

Hit and trial method:

If we add a "2" in front of K, H2O and KOH

[tex] \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }[/tex]

Number of atoms on both the sides become equal.

(TIP: This comes thru practice:/. but main point is even out the oxygen and Hydrogen atoms first. like if it's 3 multiply it by 2 and you get an even number, I.e., 6)

Number of atoms of each element on the LHS:

Number of atoms of each element on the LHS:

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Hence, the balanced form of the equation is:

[tex] \boxed{ \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }}[/tex]

Answer:

They form when plates collide. I hope this helps you!

Answer:

The word "transfers" completes the sentence.

Explanation:

A wind turbine transforms the mechanical energy of wind into electrical energy. A turbine takes the kinetic energy of a moving fluid, air in this case, and converts it to a rotary motion. As wind moves past the blades of a wind turbine, it moves or rotates the blades. These blades turn a generator.

Hope This Helps!

Answer:

The right answer is "kinetic"

Explanation:

Wind is moving, so has kinetic energy.

Answer:

0.225 L = 225 mL

Explanation:

Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up

Mathematically, we can write that as:

V1/T1 = V2/T2, where 1 and 2 are the two situations

So, when we substitute the values in, we get:

0.25 L/298 K = V2/268 K

Rearranging this, we get:

(0.25/298) x 268 = 0.225 L = 225 mL.

This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)

Let me know if this makes sense, and hope I helped! :)

1. a

2. a

3. b

4. b

5. c

6. a

7. c

Answer:

english please I don't understand

Answer:

Distillation is the process by which sugar can be separated from the sugar solution.

Explanation:

Distillation, or classical distillation, is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.

Answer:

Boil the water, this would cause the water to evaporate and will leave behind the sugar crystals, which is known as distillation.

The balanced equation for the production of water from hydrogen gas is

2H₂   +   O₂   →    2H₂O

Based on the balanced equation, for every mole of hydrogen, a mole of water is produced.

∴ Since the moles of water = 25 moles

25 moles of H₂ (hydrogen gas) are required to make 25 moles of H₂O.

Stoichiometry is an important concept which helps us use the balanced chemical equation to measures the amount of reactants and products.

The balanced chemical equation is the equation in which the number of atoms on the left hand side that is reactant side is equal to the number of atoms on the right hand side that is product side in an equation.

First we have to write the Balanced chemical equation

2H₂ + O₂ → 2H₂O

To produce 2 moles of water, 2 moles of hydrogen are required to produce 25 moles of water.

According to the Stoichiometry

[tex]\frac{2\ \text{moles of}\ H_2}{2\ \text{moles of}\ H_2O} \times 25\ \text{moles of}\ H_2O[/tex]

= 25 moles of hydrogen gas is required

Thus, from above conclusion we can say that 25 moles of H₂ (hydrogen gas) are required to make 25 moles of H₂O.

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Answer: Gravity i think

Answer:

GaCl3

Explanation:

Gallium trichloride | GaCl3 |

Answer:

GaCl3

Explanation:

Answer:

A

Explanation:

Answer:

The abundance of X-100 is 75 percent, and X-104 has an abundance of 25 percent. The answers are found by solving two equations with two unknowns, which are A plus B equals 100, and 100A plus 104B equals 10,100.

The relative abundance of each isotope in nature

X-100 = 75%

X-104=25%

By dividing the total number of ions identified by the number of ions with a particular m/z m/z m/z ratio, one may determine the relative abundance for each individual ion in the sample.

How can the abundance of two isotopes be determined?

For chemistry problems involving relative abundance, use the following formula:

(M1)(x) + (M2)(1-x) = M (E)

Find the relative abundance of the isotopes if one nitrogen isotope, nitrogen-14, has a mass of 14.003 amu and another, nitrogen-15, has a mass of 15.000 amu.

Algebra can be used to find x. ...

x = 0.996

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Answer:

113 because there are 113 elements

Explanation:

Substances that have greater affinity for the solvent travel faster while the substance that have greater affinity for the paper travel more slowly.

Chromatography involves a mobile phase and a stationary phase. The mobile phase is the solvent that carries the mixture. while the stationary phase is the medium that performs the actual separation

The speed with which components of the  ink moves up the paper depends on its affinity for the paper or the water.

The different colors in the ink separate because some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the water moved faster, and those with a greater affinity for the paper moved slowly up the paper.

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Answer:

In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.

In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling at a speed v is 1/2*mv^2. In relativistic mechanics, this is a good approximation only when v is much less than the speed of light.

The standard unit of kinetic energy is the joule, while the English unit of kinetic energy is the foot-pound.

Explanation:

Don't directly copy and paste this because you will get flagged for plagiarism. Just type this out in your own words and change a few of the words to their synonyms.

the only report that will fool the teachers

Answer:

by principal quantum number (n) and azimuthal quantum number (l)

Explanation:

I used the web to answer so I'm not sure if this is right

Answer:

matter , equals , weight , size

i think the answer is B. scientists used evidence, analysis, and experiments to disprove Alchemy. apologies if its incorrect.