Someone pls help me I will make you brain

Answer:

a. Calcium: [Ar]4s^2

or 1s^2 2s^2 2p^6 3s^2 3p^6 (= Argon) 4s^2

b. Xenon

c. Zinc

d. Carbon

Explanation:

Group 2A = Alkaline Earth; period 4 shows that the element will be calcium.

To write the Electron Configuration we remember that Columns 1&2 and Helium represent the s-orbital which holds a maximum of 2 electrons. Columns 13 through 18 fill the p-orbital.

1. is Igneous rock

2. is underneath Earths surface

3. is Coarsed-grained

hope this help!!^^

The kind of rocks is igneous rocks formed along the sides of volcano  and are coarsed-grain rocks.

Igneous rocks are one of the three main rock types the other two including sedimentary and metamorphic rocks.These rocks are formed by cooling and solidification of lava or magma.

The magma is derived from partial melts in the planet's mantle or crust.Melting is caused by increase in temperature or decrease in pressure or even change in composition.Solidification occurs either below surface which is called as intrusive rocks or on the surface as extrusive rocks.

They are classified according to their texture,mode of occurrence,chemical composition,geometry and mineralogy of rock.The two important variables for classification are mineral composition and cooling history.

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Answer:

12. A

13. A

14. D

15. B

Explanation:

12. The 3rd law of motion is the force of our object being equal and opposite the other. If the Buller goes forward with force, the the gun recoils backwards with the same force.

13. There's nothing else described in the problem besides him getting kicked in the face

14. If you mive the oars forwards then the boat itself moves backwards

15. The gas helps push the rocket upwards since it goes downwards.

Answer:

They all have the same density

Explanation:

Density is an intensive physical property, meaning that as long as the chemical formula is the same, that specific intensive physical property will be the same. For example. One kilogram of feathers has the same mass as one kilogram of bricks. Why? They both have a mass of one kilogram.

It's the same thing here. Since all the objects are (assumed to be) made up of 100% gold, they would all have the same density regardless of the mass. For extra points, say the density of each object is [tex]19 \frac{g}{cm^3}[/tex].

Answerthey all have the same density Explanation:

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

Answer:

Answer is 46.00%

Explanation:

absolute mass= A1F1 +A2F2

100

42.8452= 44×8% + 41×( 100--F2)

100

so you get

F2= 46.00%

am not sure

Answer:

Total of 4 isomers of hepta-2,4-diene are given

Explanation:

pls mark brainliest

hope this helps  <3

Answer:

Explanation:

Answer:

Nonbiodegradable substance

Explanation:

Chlorine is a non metal so covalent bond. KBr has K metal and Br non metal of opp. charges so ionic bond. Na is a metal so ionic bond. NaCl has Na as metal and Cl as a non metal so ionic bond.

D is incorrect

Answer:

a

Explanation:

its formed from sodium and sodium metal is produced by electrolysis of dry molten sodium chloride.

Answer:

ELECTRONEGATIVITY is the tendency of an atom in the molecule to attract the bonded pair of electrons .

Explanation:

it might help you!!!!!!

Answer:

the relative strength with which an element attracts electrons in a chemical bond

Explanation:

Answer:

A because even if its a minor cut, it's always a better choice to inform someone.

Explanation:

Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.

The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.

Answer:

transmission clutches

Selectivity is relatively easy to alter, with mobile phase composition and stationary phase being the primary means of adjustment. The hydrophobicity, polarity and nature of the chosen stationary phase all play a crucial role in analyte interaction and directly affect the selectivity of a separation.

In chromatography, it is important to select a good stationary phase so as to ensure proper separation of components.

Chromatography is a separation technique which is generally used for separating substances based on their solubilities. The technique makes use of two phases the mobile phase and the stationary phase.

The components are separated from each other based on their solubility in the mobile phase. Component which is least soluble does not travel along the mobile phase while component which is highly soluble travels with the mobile phase.

The difference in the solubility of the components is measured with the reference to the solvent front and is expressed in terms of Rf value.Chromatography finds application in forensics, separation of organic compounds,etc.

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According to the forces of attraction , ice is a solid which will melt under applied pressure.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

Whistle 2 has a lower pitch, but is louder.

Whistle 3 has higher pitch and is less loud.

Explanation:

The more frequent the arches are the higher the pitch.

The larger the amplitude the louder the sound is.

;D

Answer:

identify two ways in which carbon-12, carbon-13, and carbon-14 are alike. they each have 6 protons and neutrons and they're all carbon atoms. what is a chemical compound?

Answer:

i think it would be answer D

Explanation:

Answer:

The sun reflects off different parts of the moon as it orbits the earth

Explanation:

Answer:

the sun reflects off different parts of the moon as it orbits the Earth.

Answer:

Postulates of Dalton's Atomic Theory:

1) Atoms can neither be created nor destroyed.

2) During chemical reaction, atoms combine or separate or re-arrange. They combine in simple ratios.

3) All elements are composed of the indivisible particles called atoms.

4) Atoms of a particular element are identical. They have the same mass and volume.

Postulates of modern atomic theory:

1) All matter is composed of atoms.

2) Atoms consist of protons, electrons and neutrons.

3) Atoms of an element may differ in masses. (as in isotopes)

4) The ratio in which elements combine may not be simple.

Similarities:

1) All elements/matter are/is composed of atoms.

2) Atoms can neither be created nor destroyed.

3) During chemical reactions, atom combine or separate or rearrange.

Differences:

1) Dalton's theory said that atoms are indivisible particles but modern theory denies it and calls atom a divisible particle consisting of sub-atomic particles, protons, electrons and neutrons.

2) Dalton's theory said that atoms of the same element have same mass and volume but according to modern theory, it is said that atoms of the same element can differ in mass (as in isotopes).

3) Dalton said that atoms combine in simple ratio but modern theory denies it.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

Nice experiment

Explanation:

Melting points of enantiomers will not compare to each other as they have same M.P. and Diastereoisomers are compared on the basis of melting point.

Stereoisomers are those isomers which are having the same molecular formula but different spatial arrangemet of atoms within the molecule.

Hence, only diastereoisomers are compared on the basis of melting point.

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Since we are starting from the number of atoms of Sulfur, we need to know two sets of formulas:

        ⇒ mass = (atoms ÷ Avogadro's Number) ×  molar mass

  mass = [(2.01 × 10²⁴ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (32.06 g/mol)  

            = 107.01 g

The molar mass of sulfur S is 32.06 g/mol, then the mass in grams of a sample of S containing 2.01x10^24 atoms  is 107.01 g

The molar mass can be defined as the weight of one sample mole, by Multiplying  the subscript means  the number of atoms times that element’s atomic mass and add the masses of all the elements in the molecule to obtain the molecular mass.

Molar mass is  expressed in either gram ( g) or kilograms (kg).

Mass  = moles × molar mass

moles = atoms ÷ Avogadro's Number

       ⇒ mass = (atoms ÷ Avogadro's Number) ×  molar mass

 mass = [(2.01 × 10²⁴ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (32.06 g/mol)  

          = 107.01 g

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Answer:

Although the terms mass percent and percent composition are used interchangeably, they are different terms. The mass percent refers to the percentage of a component in a mixture, while the percent composition refers to the percentage of a particular chemical element in a mixture.

Explanation:

Hope this helps...

Answer:

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Explanation:

hop it helps.....

Answer: Substances giving off heat and light, themselves, is always chemical. What we see in the sky are new colors and light. 1. Changing the size and shapes of pieces of wood would be a chemical change. 2. In a physical change, the makeup of matter is changed.

Explanation: