The percent abundance of each isotope tells you how many of each kind of isotope exist in every 100 particles. What does relative abundance tell you?

Answer:

Ozone layer AKA ozone shield

Explanation:

I did this test too! :)

The first basic metal on the periodic table is lithium.

The first basic metal on the periodic table is lithium. It is part of Group 1, which is known as the alkali metals. Alkali metals are very reactive and form basic (alkaline) solutions when they react with water.

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The first basic metal on the periodic table is lithium, part of the alkali metals in group 1 of the periodic table. These metals are known for their reactivity, forming ions to create ionic compounds which are usually soluble in water.

The first basic metal on the periodic table is lithium. It's part of the alkali metals which constitute group 1 of the periodic table. The other alkali metals are sodium, potassium, rubidium, cesium, and francium. Despite hydrogen also being in group 1, it is not considered a metal but a nonmetal.

These alkali metals are known for their high reactivity. They readily form ions with a charge of 1+ to create ionic compounds, which usually dissolve in water. In addition, they react vigorously with water to produce hydrogen gas and a basic solution of the metal hydroxide, hence justifying the name alkali metal.

Many of these elements may not occur naturally in an uncombined state because they can readily react with water and oxygen in the air. Yet, when isolated from their naturally occurring minerals, they react very slowly with air due to the formation of a protective nonreactive film coating also known as passivation.

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ganan electrones debido a que gracias a la regla del octeto alcanzan estabilidad de los gases nobles.

es la C

In chemical reactions between metals and nonmetals metals lose electrons and become positively charged ions or cations through a process called ionic bonding. An example of this process is when Sodium (Na) loses an electron to become Na+ and combines with Chlorine (Cl) to form Sodium Chloride (NaCl).

When metals like Na (Sodium) combine with nonmetals such as Cl (Chlorine), the metals lose electrons and become positively charged ions. This happens due to the process of ionic bonding where electrons are transferred from the metal atom to the nonmetal atom. In this case, Sodium loses one electron to become a cation (Na+), and Chlorine gains this electron to become an anion (Cl-). This difference in electric charge holds the atoms together, thus creating an ionic compound namely Sodium Chloride (NaCl).

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The equation we need to use to solve this is: c=λν

c is the speed of light (2.998 x 10^8 m/s)

λ is the wavelength, which we're gonna solve for

ν is the frequency ( 2.4 x 10^14 Hz )

First, plug in the values we were given into the equation

2.998 x 10^8 m/s= (λ)(2.4 x 10^14 Hz)

Next, divide both sides of the equation by 2.4 x 10^14 Hz to solve for the wavelength (λ)

λ= 1.249166667 x 10^-6 m

Round to 2 significant figures

λ= 1.2 x 10^-6 m

Le Chatelier principle says, if a restriction is applied to a system in equilibrium, the system adjusts to a new equilibrium that tends to counteract the restriction. When equilibrium is under stress it will shift to relieve that stress.

or

all concentrations would change.

Answer: A system whose equilibrium has been upset will shift to restore equilibrium.

Explanation:

This would be the downward movement of water. It begins flowing and continues in a downward movement moving throughout,

When the water vapor condenses into larger droplets in the clouds, the formation of rain occurs. The precipitation that flows into river, lakes, and streams is called the rain.

The droplets of water which are condensed as a result of the evaporation is defined as the rain. The formation of clouds takes place during the water cycle. Rain is also called the precipitation. This flows in to all water bodies like river, lakes, etc.

The hot air containing water molecules from different places rises above the ground level and after reaching a particular height it will expands and cools. The process in which the droplets of water changes into water vapor is called the condensation.

The cluster of water droplets combine together to form heavy water masses. When they grow big, they fall down into the atmosphere as rain. They are precipitations. These may be in the form of snow, hail, etc.

Thus the precipitation that flows into river, lakes, and streams is the rain.

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The other change that will occur in the bottle is that A. The air pressure will increase.

If volume changes in a closed container, while temeprature remains constant, the phenomenon is described by Boyle's Law:

[tex]P1*V1=P2*V2[/tex]

Let's give some arbitrary values to these variables:

P1= 1 atm

V1= 2 L

P2= ?

V2= 1 L

Calculating the final pressure (P2):

[tex]P2=\frac{P1*V1}{V2}=\frac{1 atm*2 L}{1 L}=2 atm[/tex]

So, the final pressure is higher than the initial pressure (P2>P1). That means that Pressure and Volume are inversely proportional.

Have a nice day!

A.Carnivore that feeds on primary consumers.

Secondary consumers eat primary consumers. They are carnivores (meat-eaters) and omnivores (animals that eat both animals and plants).

We defined secondary consumers as organisms, primarily animals, which eat primary consumers. Furthermore, secondary consumers can be classified into one of two groups: carnivores, or meat eaters, and omnivores, which are plant and meat eaters.

Answer: prymairy

Explanation:

Hello!

Explanation:

↓↓↓↓↓↓↓

Density is the amount of mass in a given volume. It's a derived unit of measure. It is equal to mass divided by volume. It's measured in units such as grams per cubic centimeter and grams per milliliter. Density is the ratio of mass to volume. Density is a physical property of an object. It is degree of compactness of a substances. Relative density is used to separate solids, liquids, and gases. The gas in the container rises to the top because it has the least density. The liquids separate into individual layers based on their relative densities. The least dense liquid is on top. The most dense liquid is on bottom. The solids sink to the bottom of the container because they have the greatest density.

Hope this helps!

Thank you for posting your question at here on Brainly.

-Charlie

Answer:

The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume). The mass of atoms, their size, and how they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume; D = m/v.

Explanation:

The number of protons in the nucleus always varies among atoms of different elements.

Every element has a different number of protons than every other element.

Answer:The correct answer is option C.

Explanation:

Chemical property of the substance is a property which is observed in a chemical reaction during which identity or composition of the substance changes.

Iron when exposed to air ,react with atmospheric oxygen to from ferric oxide which is a reddish brown in color.Also termed as Rust.

[tex]Fe(s)+O_2(g)\righhtarrow Fe_2O_3(s)(\text{Reddish brown})[/tex]

Hence, the correct answer is option C.

Answer:

The correct answer is option C.

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

For Example: reactivity , toxicity etc.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

The chemical property observed by the the student is that iron rusts when exposed to air. The oxygen present in the air reacts with iron to form reddish brown compound named rust.

[tex]4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)[/tex]

Here, iron's reactivity is observed which is a chemical property of the iron.

Where mass ,  density and being a electricity conductor are physical properties.

One Mn atom contains 5 electrons in it's 3d subshell.

Mn atom has [tex]$\boxed5$[/tex] electrons in its 3d subshell.

Further explanation:  

The electronic configuration is the distribution of electrons of an atom in the atomic orbitals. There are two states for an electron: ground as well as the excited state. The configuration of the atom in the lowest possible energy levels is called the ground-state electronic configuration. When an electron jumps from the stable ground state to some higher level, that state is called the excited state and the electronic configuration corresponding to this state is known as the excited-state half-filled configuration.

The filling of electrons in different energy levels or orbitals is done in accordance with the following three rules.

1. Aufbau principle: The principle states that the electrons are filled in various orbitals in the increasing order of their energies as follows:

1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d<6p<7s<5f<6d<7p

2. Hund’s rule: Electron pairing will not start until each orbital is singly occupied.

3. Pauli’s exclusion principle: According to this principle, all the four quantum numbers [tex]$$\left({n,\;l,\;{m_l},\;{m_s}}\right)$$[/tex] for any two electrons can never be the same. In an orbital, the spin of two electrons has to be different. If one electron has the clockwise spin, the other would have the anticlockwise spin and vice-versa.

Manganese is a transition metal of the first transition series. The atomic number of Mn is 25. Its electronic configuration is [tex]$$\left[{{\text{Ar}}}\right]\;3{d^5}4{s^2}$$[/tex] . It has half-filled d-subshell. (Refer to the attached image). So the total number of electrons in 3d subshell of Mn is 5.

Learn more:

1. Determine the ion with configuration [tex]$$\left[{{\text{Ar}}}\right]\;3{d^2}$$[/tex] : https://brainly.com/question/7599542

2. Identification of element which has electron configuration [tex]$$1{s^2}2{s^2}2{p^2}3{s^1}$$[/tex] : https://brainly.com/question/9616334

Answer details:

Grade: High School

Subject: Chemistry    

Chapter: Electronic configuration of the elements

Keywords: Mn, electrons, 3d subshell, 5 electrons, transition metal, 25, transition series, half-filled, aufau principle, Pauli’s exclusion principle, Hund’s rule.

0.15mg = 0.00015g

Na =22g/mol

Cl= 35g/mol

35g/mol + 22g/mol = 57g/mol

0.00015g * 1 mol/ 57 g =2.63 * 10⁻⁶

0.00015g * 1 mol/ 57 g * NA/1mol = 2.63 * 10⁻⁶ NA

2.63 * 10⁻⁶ * 6.02 * 10²³ = 15.8326 * 10¹⁷

Answer:

2.56×10^-6 moles

Explanation:

Number of formula units is the same as the number if moles of NaCl present.

Number of moles= mass/ molar mass

Molar mass of NaCl= (23+35.5)= 58.5gmol-1

Given mass of NaCl= 0.15×10^-3g

Number of moles= 0.15×10^-3/58.5

Number of moles = 2.56×10^-6 moles

I think A is the correct answer but i am not positive

Try the third option

pretty sure its d since its one less layer of our atmosphere but I haven't learned this yet I'm just using common sense

Answer:

Increased exposure to radiation may cause skin ailments.

Hope this helps (;

*(Answer)*= An ion can have a positive or negative charge. Furthermore, it is a an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

*(Request)*= Searching the definition can help you find a definition faster.

Hope this helps

User who Answered: BangtanBoyScouts

D.  The number of electrons equals the atomic number for a neutral element.  Each number after the letter refers to the number of electrons in that shell.  So for D, 2+2+6+2+6+2 = 20 electrons, which is equal to the atomic number.

D. 1s2 2s2 2p6 3s2 3p6 4s2

Hope this helps!

Is their any specific options..?

Your question is subjective and depends on the context, individual preferences, and the methods available. The choice of method often depends on efficiency, ease of use, and the information at hand.

The question you asked, 'Which method is more convenient for you to use?' is subjective and depends on the individual's preferences, the situation, and the options available. As a tutor, it's difficult to provide a specific answer without knowing the context or the methods being referred to. But in general, the choice of method often depends on factors such as efficiency, ease of use, and the information you have at hand. It's essential to evaluate all of these factors before making a decision on the most convenient method to use.

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Normally, the number of electrons is equal to the number of protons, which makes atoms electrically neutral. The number of protons in an atom is the defining feature of an atom. It's what makes one element different from another. The number of protons in an atom is called its atomic number.

Final answer:

Atoms differ from one another based on their atomic number, which is the number of protons in the nucleus. This atomic number determines the chemical properties and identity of the element. Isotopes, atoms of the same element with different numbers of neutrons, have the same atomic number but different mass numbers.

Explanation:

Atoms of one element are distinct from those of another element primarily due to the number of protons, which is known as the atomic number (Z). This is a defining feature that gives each element its unique identity. For instance, all atoms of hydrogen have exactly one proton, while all atoms of iron have 26 protons. Not only do the protons differentiate elements, but they also contribute to the unique properties of each element, such as reactivity or physical characteristics. Furthermore, elements can have isotopes, which are atoms of the same element with the same number of protons but a different number of neutrons, leading to a variance in mass numbers. These isotopes behave similarly in chemical reactions but differ in mass and sometimes nuclear stability.

Isotopes and Chemical Identity

Isotopes are significant in that they are variations of the same element with different neutron counts. An example is carbon, which can have six, seven, or eight neutrons, resulting in different isotopes like Carbon-12, Carbon-13, and Carbon-14, each with unique mass numbers but the same atomic number of six. Even though isotopes of an element have slightly different physical properties, they possess the same chemical properties, which is why they react similarly in chemical processes.

The initial temperature of the water was 56.7 °C.

Step 1. Calculate the temperature change.

The formula for the heat (q) absorbed is

q = mCΔT

We can solve this equation to get

ΔT = q/(mC)

q = 5.49 × 10⁵ J; m = 3030 g; C = 4.184 J·°C⁻¹g⁻¹

∴ ΔT = 5.49 × 10⁵ J/(3030 g × 4.184 J·°C⁻¹g⁻¹) = 43.30 °C

Step 2. Calculate the initial temperature

ΔT = T_f – T_i = 100°C – T_i = 43.30 °C

T_i = 100 °C – 43.30 °C = 56.7 °C

Answer: phase :option D

Particle :option C

Element : option B

Atom : option A

Explanation:

Answer:

Atom- the basic unit of an element

Element- a substance that cannot be broken down into a simpler substance

Particle- a tiny piece of matter

Phase-  a unique form of matter in which it can exist

Explanation:

I just ahd this on my quiz, swear its correct

Steps:

Mw = w * R * T / p * V

T = 88 + 273 => 361 K

p = 975 mmHg in atm :

1 atm  = 760 mmHg

975 mmg / 760 mmHg =>  1.28 atm

Therefore:

= 0.827 * 0.0821 * 361 /  1.28 * 0.270

=  24.51 / 0.3456

molar mass =  70.92 g/mol

Answer: For red color firework we will use combination of strontium carbonate with lithium carbonate and for purple color we will use combination of strontium salts with copper salts.

Explanation:

There are various metallic salts which on performing flame test imparts characteristic color to the flame and this color is due to presence metal ions.

Color seen during the fireworks are mainly due to the presence of the metal ions present in the material from which the firework is made.

for example : strontium carbonate on flame test imparts bright red color to the flame where as barium chloride imparts green color to the flame.

The combinations of compounds are:

For red color firework we will use the combination of strontium carbonate with lithium carbonate because  combination strontium and lithium ions both imparts red color to the flame.

For purple color we will use the combination of strontium salts with copper salts because combination of strontium and copper ions imparts purple color to the flame.

Hey there!

Consider 100 g of solution:

Mass of NaCl = 3.50% of mass of seawater

( 3.50 / 100 ) * 100 => 3.50 g

Number of moles as shown below:

Molar mass NaCl = 58.44 g/mol

n = Mass / molar mass

n = 3.50 / 58.44 => 0.059 moles of NaCl

Mass of sweater:

Mass of solution -  Mass of NaCl

100 -  3.50 = 96.5 g

96.5 g in Kg :

96.5 / 1000 => 0.0965 Kg

Therefore ,calculate molality  by using  the  following formula:

molality =  number of moles  of solute / mass of solution

molality = 0.059 / 0.0965

molality = 0.61 m

Hope That helps!

The chemical formula for the compound magnesium perchlorate is Mg(ClO₄)₂

Magnesium perchlorate or Mg(ClO₄)₂ is an ionic compound.

Perchlorate here is an anion which is represented by ClO₄⁻. Perchlorate is a polyatiomic anion, where one Cl atom is bonded to four O atoms.

The magnesium cation is represented by Mg²⁺

So one Mg²⁺ cation combines with two ClO₄⁻ anion to form one molecule of Mg(ClO₄)₂

Answer: Mg(ClO₄)₂

Explanation: Correct on PLATO.

Answer :

                      (D) [tex](NH_{4})_{2}S[/tex]      (C) [tex]Ba(NO_{3})_{2}[/tex]            (B) [tex]CuCl_{2}[/tex]

(A) [tex]K_{2}SO_{4}[/tex]                _                     [tex]BaSO_{4}[/tex]                          _

(B) [tex]CuCl_{2}[/tex]             [tex]Cu_{2}S_{2}[/tex]                     _                          

(C) [tex]Ba(NO_{3})_{2}[/tex]            BaS  

Explanation :

(1) Reaction for A + B

[tex]K_{2}SO_{4}[/tex] + [tex]CuCl_{2}\rightarrow[/tex] 2KCl + [tex]CuSO_{4}[/tex]

In this reaction, there is no precipitate formed as the products are souble.

(2) Reaction for A + C

[tex]K_{2}SO_{4}[/tex] + [tex]Ba(NO_{3})_{2}\rightarrow[/tex] [tex]BaSO_{4}[/tex] + [tex]KNO_{3}[/tex]

In this reaction, [tex]BaSO_{4}[/tex] is formed as precipitate as it do not dissolve.

(3) Reaction for A + D

[tex]K_{2}SO_{4}[/tex] + [tex](NH_{4})_{2}S\rightarrow[/tex] [tex]K_{2}S[/tex] + [tex](NH_{4})_{2}SO_{4}[/tex]

In this reaction, there is no precipitate formed as the products are souble.

(4) Reaction for B + D

[tex]2CuCl_{2}[/tex] + [tex]2(NH_{4})_{2}S\rightarrow[/tex] [tex]4NH_{4}Cl+Cu_{2}S_{2}[/tex]

In this reaction, [tex]Cu_{2}S_{2}[/tex] is formed as precipitate as it do not dissolve.

(5) Reaction for B + C

[tex]CuCl_{2}[/tex] + [tex]Ba(NO_{3})_{2}\rightarrow[/tex] [tex]BaCl_{2}[/tex] + [tex]Cu(NO_{3})_{2}[/tex]

In this reaction, there is no precipitate formed as the products are souble.

(6) Reaction for C + D

[tex]Ba(NO_{3})_{2}[/tex] + [tex](NH_{4})_{2}S\rightarrow[/tex] BaS + [tex]2NH_{4}NO_{3}[/tex]

In this reaction, BaS is formed as precipitate as it do not dissolve.

The answer is condensation.

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Answer:

B

Explanation:

30.97 g/mol

B. 30.97 g/mol. Molar mass of phosphorus (P) = 30.97 g/mol. So, the correct answer is B. 30.97 g/mol.

The molar mass of an element is the mass of one mole of atoms of that element, expressed in grams per mole (g/mol). To find the molar mass of phosphorus (P), we look at the periodic table to find the atomic mass of phosphorus.

The atomic mass of phosphorus (P) is approximately 30.97 atomic mass units (amu).

Since 1 mole of any element contains Avogadro's number of atoms (6.022 × 10²³), the molar mass of phosphorus (P) is equal to its atomic mass in grams:

Molar mass of phosphorus (P) = 30.97 g/mol

So, the correct answer is B. 30.97 g/mol.

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