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Answer:

B: 1s²2s²2p¹

Na: 1s²2s²2p⁶3s¹

Explanation:

A = 2

B = 1

C = 2

D = 6

E = 1

Hope that helps.

Answer:

B: 1s2 2sA2pB

A = 2

B = 1

Na: 1s22sC2pD3sE

C = 2

D = 6

E = 1

Answer:

Microwaves

Explanation:

Microwaves have more energy than blue light

Among microwaves or blue light, blue light has a higher frequency. This is because blue light belongs to the visible region has a short wavelength and produces a higher amount of energy.

The frequency of any wave is inversely related to the wavelength. This means that when the frequency of the wave increases, the wavelength decreases. While the relationship between frequency is directly related to the energy.

According to the context of this question, gamma rays have the highest frequency and shorter wavelength, while radiowaves have a shorter frequency and the highest wavelength.

Therefore, blue light has a higher frequency. This is because blue light belongs to the visible region has a short wavelength and produces a higher amount of energy.

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Answer: Sodium Nitrate solution is neutral.

Explanation: Sodium nitrate solution has strong bases and strong acids so it would have a neutral pH of 7.

Answer: The first one would be a frozen thing like ice since the molecules are so packed, the next would be like this inside of a basketball or car tires, they move around freely(solid), and the last would be a gas since they aren't so many left(gas)

Explanation:

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the states are solid, liquid and gases.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. Degree of Celsius is used to measure temperature which has nothing to do with matter.

Therefore, the states are solid, liquid and gases.

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Answer:

C

Explanation:

Silt is very benifical for plant growth. So the one with the most silt would be the best for gardening soil.

Answer: C

Explanation:

Answer:

Mass = 17.8 g

Explanation:

Given data:

Number of atoms of Ca = 2.68 × 10²³

Mass in gram = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.68 × 10²³ atoms × 1 mole  /6.022 × 10²³ atoms

0.445 mol

Mass in gram;

Mass = number of moles ×  molar mass

Mass = 0.445 mol  ×  40 g/mol

Mass = 17.8 g

Explanation:

Agl+hih+356bnh$&56DG hug zero cg hydh hod sir un bucks

Answer:

Concept: Half-life

Answer:

Solubility

Explanation:

Solubility units that incorporate units of solution include grams of solute per 100 grams of solution or grams of solute per liter of solution. Another way to express solubility is in moles of solute per liter of solution; this ratio is called "molarity."

Answer:

Circulatory System

Explanation:

Blood carries oxygen to the rest of the body, as well as glucose.

Answer:

CESIUM

Explanation:

Potassium is one of the alkali metals. The alkali metals are the elements that make up Group 1 (IA) of the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. The alkali metals also include lithium, sodium, rubidium, cesium, and francium.

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The element which contains similar chemical properties as of Potassium would be:

B). Cesium

'Potassium' is described as the element that is 'soft and waxy in appearance' with the symbol K and atomic number 19 and "Cesium' is also soft in nature and it possesses a goldy finish.

The similarity between the chemical properties of 'Potassium' and 'Cesium' include:

Thus, option B is the correct answer.

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Answer:

dinitrogen pentasulfide

Explanation:

The correct name for the compound N₂S₅ is Dinitrogen pentasulfide and the correct option is option C.

Naming of compounds refers to the systematic process of assigning names to chemical compounds based on their composition and structure. It involves following certain rules and conventions to generate appropriate names that accurately represent the chemical formula and characteristics of the compound.

In inorganic chemistry, naming compounds often involves identifying the elements present and specifying their respective oxidation states or charges. Various naming conventions, such as the Stock system and the common system, are used depending on the type of compound and the specific elements involved.

Thus, the ideal selection is option C.

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Answer:

It’s eutrophication

Explanation:

There is no way it can be DEFORESTATION or NON  SUSTAINABLE SPECIES

Non sustainable harvesting has something to do with animals and eutrophication means adding excessive nutrients

Answer:A.

Explanation: I took the test, sorry if this is incorrect

Answer: Since the vials are filled the same, and are placed on the same hot pad, all the water will evaporate at the same time

Explanation:

The source of error in the experiment  is the vials  being filled the same, and  placed on the same hot pad, all the water evaporating at the same time .

Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.

There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.

Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.

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Answer:

Explanation:

yt

Answer:

129.5994 g/mol

Explanation:

Answer:As the tetrapod evolved, the number of digits decreased

Explanation:

Answer: During the evolution of the tetrapod limb, the number and pattern of elements along the proximal–distal axis (running from the shoulder to the fingers) has remained invariant, while the number and pattern of elements along the autopod anterior–posterior axis (thumb to little finger, also designated digi

Explanation:

Answer:

4104 Coulombs

Explanation:

charge = time(sec) *current

25*60 =1500+20=1520

2.7A * 1520 sec =4104

4104 C

Answer:

0.17×10⁻³ mol

Mass = 0.00476 g

Explanation:

Given data:

Number of molecules of N₂ = 1 ×10²⁰ molecules

Number of moles of N₂ = ?

Mass in gram of N₂ = ?

Solution:

1 mole of any substance contain 6.022×10²³ molecules

1 ×10²⁰ molecules× 1 mol /6.022×10²³ molecules

0.17×10⁻³ mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.17×10⁻³ mol × 28 g/mol

Mass = 4.76×10⁻³  g

Mass = 0.00476 g

Answer: If only max or min yes but if we have min and max that is a bad idea it is not as safe.

Answer:

fullerene

Explanation:

Answer: 1400 mL

Explanation:

The change in volume with change in pressure and change in temperature can be calculated using combination of gas laws. Here, the change in volume is 5600 ml.

Boyle's law, Charles's law and Gay- Lussacs law all relating the temperature, pressure and volume of an ideal gas. The relation between these three parameters from the combination of these laws at conditions is written as:

P1 V1/T1 = P2 V2/ T2.

From this, the change in volume V2 can be calculated.

Given , P1 = 760 mmHg

T1 = 20 k and V1 = 1400 mL.

T2 = 40 k and P2 = 380 mmHg.

The new volume V2 = P1 V1 T2 / T1 P2.

                                  = (760 mmHg × 1400 ml × 40K) / (20 K × 380 mmHg)

                                  = 5600 mL.

Therefore, the change in volume of the gas is 5600 ml.

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when forces are balanced the object does not move.

Explanation:

if you and your friend push both sides of the chair at the same time with the same amount of strength the chair wouldn't move.

Answer:

0.768 m

Explanation:

1 cm = 0.01 m

76.8 cm * 0.01 m/ 1 cm

0.768 m

Answer:

Calcium

Explanation:

Answer:

the octet rule is a chemical rule of thumb that reflects the observation that main group elements and bonds and such a way that each has a electrons in its valence shell giving the same electronic configuration as noble gas

Answer:

As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return back to the gas phase. As a result, the solubility of a gas decreases as the temperature increases.

Explanation:

Answer:

Ld₂Mz

General Formulas and Concepts:

Chemistry - Compounds

Explanation:

Step 1: Define

"Lindenium" Ld w/ oxidation charge of +1

"Mendezine" Mz w/ oxidation charge of -2

Step 2: Write Compound

To balance out the charges to be neutral (0), we must counter balance the amount of Ld's with Mz's. We need 2 Ld's with 1 Mz to create a compound with a neutral charge:

2Ld¹⁺ + Mz²⁻

2(+1) + (-2) = (+2) + (-2) = 0 (neutral charge)

Therefore, our compound must be Ld₂Mz.

Answer:

C. 18

Explanation:

its b(8)

Explanation:

the third energy level can actually hold up to 18 electrons but it's not filled when it has 8 electrons

Answer:

A (option) .............

Answer:

Al2O3

Explanation:

ZnO,Al2O3,PbO2 are some of the amphoteric oxides

Amphoteric oxides are metal oxides that can react with both acids and bases,so Aluminum oxide can react with both HCl and Sodium hydroxide which is a base