True or false a homogeneous mixture is a mixture in which it is difficult to distinguish the substances from one another
What property is used to organize elements on the periodic table?
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.
One liter of a solution ph 9 has how many more hydroxide ions (oh-) than 1 l of a solution of ph 4?
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 moles of sodium iodide are needed to remove 5.95×10−6 mol of o3?
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.
If an isotope has an atomic number of 8 and a mass number of 18 how many neutrons
These substances are made up of two or more elements chemically combined?
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.
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?
Two or more atoms held together by covalent bonds is called a(n) __________
chemistry
how do you count atoms?
4 HNO3
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.
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.
Electrons in an atom may only have certain energy. because of this, the energy of the electrons in an atom is said to be ________.
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.
How many nanoseconds are there in one minute?
How many grams 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.
Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as...
Repulsion between closely packed protons in the nucleus is overcome by
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.
Why are the halogens less reactive going down the periodic table ?
Is a substance that a filter can seperate into two parts a mixture or a pure substance?
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 ____________.
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.
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?
Elements in a group have the same number of valence electrons and the same ____
Elements in a group have the same number of valence electrons and the same chemical properties because the valence electrons determine how an element will react with other elements.
Explanation:The elements in a group have the same number of valence electrons and the same chemical properties. Valence electrons are the electrons in the outermost energy level of an atom, and they determine how an element will react with other elements. The similarity in chemical properties among elements of the same group occurs because they have the same number of valence electrons. For example, all the elements in Group 1 (alkali metals) have one valence electron, and they all react violently with water to form alkaline solutions.
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The complete sentence should be, Elements in a group have the same number of valence electrons and the same chemical properties,
Which is why they exhibit similar reactivity and behavior. This periodic trend is consistent across groups and can be exemplified by alkali metals and halogens.Elements in a group have the same number of valence electrons and the same chemical properties. This is because the number of valence electrons determines how elements react, including their tendency to lose, gain, or share electrons.The periodic trend of valence electrons illustrates this clearly: for example, all alkali metals in Group 1 have one valence electron, while all halogens in Group 17 have seven valence electrons. This similarity in electron configuration results in comparable reactivity and chemical behavior among elements in the same group.Write the formula for barium nitrite. write the formula for barium nitrite. bn ba(no2)2 ba3n2 b(no2)3 bano3
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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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
Of the molecules sicl4 and sii4, which has bonds that are more polar?
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:
Which mass measurement contains four significant figures? 1. 0.086 g 2. 0.431 g 3. 1003 g 4. 3870 g
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]
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
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
how many mg are there in a 5.00 grain aspirin tablet ? 1 grain = 0.00229 oz . there are 454 g/lb
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.
Select the correct numerical form of this number written in scientific notation. 6.2 × 10^5
Hey there Brainly Student! Your answer is 620.000!! I hope this helped!! Your friend, GalaxyGamingKitty
Determine the oxidation state of the transition metal in each of these coordination compounds.