What is the differentences between atomic number and atomic mass?

Answers

Answer 1

Atomic number represents the number of protons, while atomic mass represents the weighted average of the masses of an element's naturally occurring isotopes.

Related Questions

How many moles of sodium iodide are needed to remove 5.95×10−6 mol of o3?

Answers

You have to find the reaction involving sodium iodide and ozone or O₃. If you search in the internet, the reaction would be

O₃(g) + 2 NaI(aq) + H₂O(l) → O₂(g) + I₂(g) + 2 NaOH(aq)

Using the stoichiometric coefficients in the reaction, the solution would be

5.95×10⁻⁶ mol O₃ * (2 mol NaI/1 mol O₃) = 1.19×10⁻⁵ mol NaI

Final answer:

Assuming a 1:1 molar ratio, the number of moles of sodium iodide needed to remove [tex]5.95\times10^-^6[/tex] mol of ozone is also [tex]5.95\times10^-^6 mol[/tex].

Explanation:

To calculate the number of moles of sodium iodide (NaI) required to remove a certain number of moles of ozone [tex](O_3)[/tex], we need to know the stoichiometry of the reaction between NaI and [tex]O_3[/tex]. This information is not provided, so we'll have to assume it is a 1:1 molar ratio, which is typical for direct redox reactions where one molecule reacts with another one-on-one.

Under the assumption of a 1:1 molar ratio, to remove [tex]5.95\times10^-^6 mol[/tex] of [tex]O_3[/tex], you would need an equal amount of NaI, which would also be [tex]5.95\times10^-^6 mol[/tex] of NaI. We are assuming a straightforward reaction where one mole of [tex]O_3[/tex] reacts with one mole of NaI to form products.

Is a substance that a filter can seperate into two parts a mixture or a pure substance?

Answers

Mixture. Mixtures can be separated into their component parts, while substances are chemically bonded atoms that can't be separated by physical means.

Which group contains elements whose atoms have six electrons in their valence shell?

Answers

Group 16 (group 6A) is the answer

chemistry
how do you count atoms?
4 HNO3

Answers

Step 1: Write the chemical formula.
Step 2: List all the atoms.
Step 3: Count the number of atoms of each element in 1 molecule.
Step 4: Multiply the number of atoms of each by the coefficient.
Step 5: Make sure your answer makes sense.

To count atoms in 4 HNO3, the coefficient 4 is multiplied with the number of each type of atom. It results in 4 hydrogen atoms, 4 nitrogen atoms, and 12 oxygen atoms.

To count atoms in a chemical formula like 4 HNO3, you look at the coefficients and subscripts. The coefficient (4 in this case) tells us how many molecules of HNO3 there are. We multiply this by the number of each type of atom within one molecule. Nitric acid (HNO3) has one hydrogen (H), one nitrogen (N), and three oxygen (O) atoms. Therefore, to count the atoms in 4 HNO3, we do the following: 4 molecules of HNO3 each contain 1 H atom, giving us a total of 4 H atoms; 4 molecules have 1 N atom each which is a total of 4 N atoms; and 4 molecules each have 3 O atoms, resulting in 12 O atoms in total. So, 4 HNO3 contains 4 hydrogen atoms, 4 nitrogen atoms, and 12 oxygen atoms.

Sodium, which has an atomic number of 11, will react with chlorine, which has an atomic number of 17. when these two atoms react, both become stable. to become stable, sodium will ____________, while chlorine will ____________.

Answers

Since all atoms favor reacting in a way that gives them the same valence electron configuration as a noble gas (the last column on the right of the periodic table), sodium will lose 1 electron, while chlorine will gain one electron.

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Explanation:

Atomic number of sodium is 11 and its electronic distribution is 2, 8, 1. Whereas atomic number of chlorine is 17 and its electronic distribution is 2, 8, 7.

As we known that in order to attain stability each element must have 8 electrons in its outer orbital. Therefore, in order to attain stability sodium will lose one electron and chlorine will tend to gain one electron.

As a result, an ionic bond will be formed between sodium and chlorine and hence, NaCl is formed.

Thus, we can conclude that sodium, which has an atomic number of 11, will react with chlorine, which has an atomic number of 17. when these two atoms react, both become stable. to become stable, sodium will lose, while chlorine will gain an electron.

Two or more atoms held together by covalent bonds is called a(n) __________

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Two or more atoms held together by covalent bonds is called a molecule.

Repulsion between closely packed protons in the nucleus is overcome by

Answers

The strong nuclear force overcomes the electromagnetic repulsive force.
(the strong nuclear force is about 137 times stronger than the electomagnetic force at subatomic distances!)

Answer:

Strong nuclear force

Explanation:

As we know that positive charges repel each other so protons do repel each other although atoms are stable because of strong nuclear force acting between nucleons (protons and neutrons in nucleus are called nucleons) which overcome the repulsive force between the proton. Strong nuclear force is very short-range force and acts only in distance of angstrom or picometre.

True or false a homogeneous mixture is a mixture in which it is difficult to distinguish the substances from one another

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A homogeneous Mixture is a mixture in which it is easy to distinguish the substances from one another.

Hope this helps

Determine the oxidation state of the transition metal in each of these coordination compounds.

Answers

Hey I think you forgot to attach a photo bud!

Why are the halogens less reactive going down the periodic table ?

Answers

The main reason why the halogens decrease in reactivity down the group is because of the increasing atomic radius going down the group from Fluorine to Astatine. As you move down the group, there is an increase in the electronic shell which leads to an increase in the distance from the nucleus to the valence shell (atomic radius). Because of this increase, the valence electron is increasingly further from the nucleus as you move down the group,which result in the pull on that valence electron being weaker; hence the weakening in the reactive power.

If an isotope has an atomic number of 8 and a mass number of 18 how many neutrons

Answers

It will be Oxygen . And total 8 protons, 8 electrons and 9 neutrons are present in it.

Which mass measurement contains four significant figures? 1. 0.086 g 2. 0.431 g 3. 1003 g 4. 3870 g

Answers

the answer is # 3

because #1 only has 2 sig figs, #2 has 3 sig figs, and #4 has 3 sig figs

Answer :

(1) The given number in 4 significant figures will be, [tex]8.600\times 10^{-2}g[/tex]

(2) The given number in 4 significant figures will be, [tex]4.310\times 10^{-1}g[/tex]

(3) The given number in 4 significant figures will be, [tex]1.003\times 10^3g[/tex]

(4) The given number in 4 significant figures will be, [tex]3.870\times 10^3g[/tex]

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

(1) The given number 0.086 g converted into 4 significant figures.

In 0.086 g, there are 2 significant figures. Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, [tex]8.600\times 10^{-2}g[/tex]

(2) The given number 0.431 g converted into 4 significant figures.

In 0.431 g, there are 3 significant figures. Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, [tex]4.310\times 10^{-1}g[/tex]

(3) The given number 1003 g converted into 4 significant figures.

Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, [tex]1.003\times 10^3g[/tex]

(4) The given number 3870 g converted into 4 significant figures.

Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, [tex]3.870\times 10^3g[/tex]

Write the formula for barium nitrite. write the formula for barium nitrite. bn ba(no2)2 ba3n2 b(no2)3 bano3

Answers

Ba(NO2)2 Since we're dealing with a nitrite, you know the formula will have NO2 in it. Also, since Barium is in the 2nd column of the periodic table, that means that Barium has 2 valance electrons. And you can kind of think of the nitrite ion as a really odd looking atom that really wants to bind with an electron. And since Barium has 2 electrons available for binding, you'll have 2 nitrite ions bind to it. So you get Ba(NO2)2

The formula for Barium nitrite is Ba(NO₂)₂. This is because barium has a +2 charge and nitrite has a -1 charge, so two nitrite ions are needed to balance the charge of the barium ion. So correct option is a.

a) Ba(NO₂)₂.

Barium nitrite is a chemical compound formed by the combination of the elements barium (Ba) and nitrite (NO₂). To understand the formula of barium nitrite, let's break down the composition of the compound:

1. Barium (Ba):

Barium is a metallic element with the chemical symbol "Ba." It belongs to the alkaline earth metal group, which is located in group 2 of the periodic table. Barium is a highly reactive metal that readily forms compounds with other elements.

2. Nitrite (NO₂):

Nitrite is a polyatomic ion composed of one nitrogen atom (N) and two oxygen atoms (O). Its chemical formula is NO₂. Nitrite is negatively charged due to the presence of two extra electrons, which gives it a -1 charge.

The chemical formula of barium nitrite is Ba(NO₂)₂.

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Electrons in an atom may only have certain energy. because of this, the energy of the electrons in an atom is said to be ________.

Answers

Assuming you are asking for the charge of an electron, your answer would be -1.

Electrons have a charge of -1, protons have a charge of +1, and neutrons are neutral.

The energy of the electrons in an atom is said to be quantized, meaning electrons can only have certain specific energy levels. These levels are characterized by quantum numbers, like the principal quantum number 'n', indicating different shells or orbits for the electrons.

Electrons in an atom may only have certain energy levels. This is because the energy of the electrons in an atom is said to be quantized. This means that the electrons can only possess specific amounts of energy, corresponding to distinct energy levels.

Niels Bohr suggested that electrons are restricted to certain orbits, and therefore, they can only have certain energy levels. Each energy level is described by quantum numbers, which are integer values that characterize the arrangement of electrons within an atom. For example, the principal quantum number, represented as 'n,' indicates different energy shells or levels, with higher 'n' values generally signifying higher energies.

Electrons are organized into energy shells labeled by the principal quantum number 'n', where the higher the energy of a shell, the farther (on average) it is from the nucleus. Each shell can contain a set number of electrons and the higher the shell number, which correspondingly indicates a higher energy level.

Energy is expended when a force moves matter across a distance.

True
False

The conservation of mass-energy and the first law of thermodynamics are synonymous.

True
False

Temperature and thermal energy are synonymous terms.

True
False

On the Kelvin scale, temperatures are expressed as positive values only.

True
False

The amount of heat transfer required to change the temperature of one gram of water one degree Celsius is also known as a calorie.

True
False

Answers

1. This is true. Specifically, this energy is in the form of work. This is because we know that the formula of work is force times distance.

2. This is true. Basically, the first law of thermodynamics is the conservation of mass, and consequently, energy. It states that the total energy of an isolated system is constant.

3. This is false. They are not synonymous because temperature is measured in terms of either °C, °F or K. Thermal energy is measured in either joules, calories, or British thermal units. They are related, but not synonymous.

4. This is true. The Kelvin scale is called the absolute temperature scale, because all temperature values are positive. This is don by finding the minimum temperature which is 0 K or equivalent to -273°C. In fact, this temperature is only ideal, and impossible to achieve.

5. This is false. Calorie is a unit of energy. But the transfer of amount of energy to raise the temperature by 1°C of 1 g of water is called the specific heat capacity of water.

how many mg are there in a 5.00 grain aspirin tablet ? 1 grain = 0.00229 oz . there are 454 g/lb

Answers

Final answer:

To convert the mass of a 5.00-grain aspirin tablet to milligrams, convert grains to ounces, ounces to grams, and grams to milligrams. A 5.00-grain aspirin tablet is approximately 324.56 milligrams.

Explanation:

The question is asking to convert the mass of a 5.00-grain aspirin tablet into milligrams. Since 1 grain is equal to 0.00229 ounces, we first need to convert ounces to grams and then to milligrams. We know that there are 28.3495 grams in an ounce, and 1 gram is equal to 1000 milligrams.

First, convert 5.00 grains to ounces:

5.00 grains * 0.00229 oz/grain = 0.01145 oz

Next, convert 0.01145 ounces to grams:

0.01145 oz * 28.3495 g/oz = 0.324555675 grams

Lastly, convert grams to milligrams:

0.324555675 g * 1000 mg/g = 324.555675 mg

Therefore, a 5.00-grain aspirin tablet is approximately 324.56 milligrams.

One liter of a solution ph 9 has how many more hydroxide ions (oh-) than 1 l of a solution of ph 4?

Answers

100,000 times more. The rule is that the product of the concentration of (H+) and (OH-) in molars is always 10^-14 (if it is more, they combine and produce simple water which brings the product back down to this number again. If it is less, water molecules will split to bring the product back up to equilibrium).
pH 9 means (H+) is 10^-9 molar. But that means (OH-) is 10^-5 at the same time.
pH 4 means (H+) is 10^-4 molar. But that means (OH-) is 10^-10 at the same time.
10^-5 / 10^-10 = 10^5 or 100,000 times more.

Final answer:

A solution with a pH of 9 has 100,000 times more hydroxide ions than a solution with a pH of 4 due to the corresponding pOH values and hydroxide ion concentrations based on the relationship between pH and pOH.

Explanation:

The student has asked about the difference in the number of hydroxide ions between a solution with a pH of 9 and another with a pH of 4. Using the relationship PH + pOH = 14, we can find the pOH.

For the pH 9 solution, the pOH would be 5 (14 - 9), which corresponds to a [OH-] of 1.0 × 10-5 M. For the pH 4 solution, the pOH would be 10 (14 - 4), corresponding to a [OH-] of 1.0 × 10-10 M. Hence, the pH 9 solution has 1.0 × 10-5 M of OH-, which is 100,000 times greater than the 1.0 × 10-10 M OH- in the pH 4 solution.

How many grams of water can be produced from 10 moles of hydrogen gas?

Answers

10 moles of H2 reacts with 5 moles of O2 creating 10 moles of water.
Water has the molar mass 18 g/mole
10 · 18g = 180 g
180 g of water can be produced from 10 moles of hydrogen gas.

10 moles of hydrogen gas can produce 180.2 grams of water, calculated by using the balanced chemical equation and multiplying the number of moles of water by its molar mass.

The student's question asks how many grams of water can be produced from 10 moles of hydrogen gas. To solve this problem, we must first write out the balanced chemical equation for the reaction between hydrogen and oxygen to form water, which is:

2 H₂(g) + O₂(g) → 2 H₂O(l)

From the equation, it is clear that 2 moles of hydrogen gas react with 1 mole of oxygen to produce 2 moles of water. Therefore, 10 moles of hydrogen gas would theoretically produce 10 moles of water since the ratio is 1:1. Next, we find the molar mass of water, which is 18.02 g/mol. Multiplying the number of moles of water by the molar mass gives us:

10 mol H₂O × 18.02 g/mol H₂O = 180.2 grams H₂O

So, 10 moles of hydrogen gas can produce 180.2 grams of water.

Select the correct numerical form of this number written in scientific notation. 6.2 × 10^5

Answers

Since the exponent is a positive 5, you would move the decimal 5 places to the right which would give you 620,000.

Hey there Brainly Student! Your answer is 620.000!! I hope this helped!! Your friend, GalaxyGamingKitty

Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as...

Answers

It's called a compound because different elements are held together by a chemical bond.

How many protons and neutrons does a silicon si atom have and hwere are each of there subatomic particles located how many electrons does a silicon atom have?

Answers

Silicon
Protons = 14
Neutrons =mass number-protons
28-14=14
Neutrons = 14
Electrons =14

These substances are made up of two or more elements chemically combined?

Answers

The answer is a compound.

Hope this helps

In each vertical column, or group, of the periodic table, the elements have ____.
a. similar chemical and physical properties
b. different chemical and physical properties
c. similar physical but different chemical properties
d. different physical but similar chemical properties

Answers

Similar chemical and physical properties

In each vertical column or group of the periodic table, elements have similar physical and chemical properties.

What is periodic table?

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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What happens to matter if we add or take away energy

Answers

It we add or take away energy from matter it will change its state. If a solid matter is provided with heat energy it will be converted into liquid and then to gaseous state. Like that if energy in the form of heat is added to gas it will convert in to liquid state or to solid state.

How many nanoseconds are there in one minute?

Answers

1 minute equals 6e+10 nanoseconds.
I hope this helped! :>

Does the density of ice affect the melting rate of ice, or does adding objects affect melting rates? I'm going to need evidence of some kind. If not, that's okay.

Answers

The density of ice does not affect the melting rate. But, adding an object does affect the melt rate. The reason this is is because when there is an object, there is less to melt. Hence, affecting the melting rate.

Adding objects affect the melting rate and hasten the process because each object possess an energy in the form of heat soo.

Lavoisier's discovery that air was not a substance but rather a mixture of nitrogen and oxygen is described as history-making. why do you think this description is accurate?

Answers

Antoine Lavoisier was part of a wealthy family in Paris. He pursued to study science upon realizing that chemistry or the study of the elements was not a well-studied field. His discovery of that air was a mixture of nitrogen and oxygen gave rise to the concept of COMBUSTION after repeating the experiments made by Priestly using mercury and other metal oxides.

The event was such a history-making because it disproved that concept that air was a pure substance along with 3 others: earth, fire, and water.

2. You have 2 m3 of a mineral ore sample. It has a mass of 1 × 104 kg. Calculate the density of the ore sample and express your results in g/cm3 with appropriate scientific notation.

Answers

2 because you add then subtract

What property is used to organize elements on the periodic table?

Answers

Atomic Number is used to organize the periodic table.

Hope this helps

Final answer:

The periodic table uses atomic number as the key property to organize elements, arranged in order of increasing atomic numbers and grouping elements with similar properties.

Explanation:

The property used to organize elements on the periodic table is their atomic number, which reflects the number of protons in an atom's nucleus. Dmitri Mendeleev initially created the periodic table, which was later redefined to use atomic number rather than atomic mass. The table arranges elements in rows (periods) and columns (groups), based on increasing atomic numbers and recurring chemical properties. Elements within the same group share similar properties and the table often includes each element's atomic number, chemical symbol, average atomic mass, and sometimes its name.

Furthermore, the periodic table also reflects patterns in electronic configurations that lead to the periodicity of properties, like ionization energy and electron affinity, which influence the physical and chemical behavior of the elements.

Of the molecules sicl4 and sii4, which has bonds that are more polar?

Answers

The bonds in the SiCl₄ molecules will be more polar.

The polarity of bonds within a molecule depends on the difference in electronegativity of the atoms that are involved in the bond. Chlorine is a more electronegative atom than iodine. Therefore, the electrons in the Si-Cl bond will be more concentrated near the Cl, creating polarity in the bond. Iodine is not as electronegative, so it will not result in a very polarized Si-I bond

Answer:

Since the electronegativity difference between the atoms is greater in SiCl4 , it has bonds that are more polar when compound to the other compound.

Explanation:

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