Need help with b) please❤️ and Happy New Year

Atomic number is the number of protons in an atom and is equal to the number of electrons also.

Atomic number = 44.

Hence number of electrons in an atom of this element (with atomic number 44) = 44 electrons.

Answer:

Similar

Explanation:

Elements that are located in the same vertical colomn or group of the periodic table have similar chemical properties. This is because they have the same amount of valence electrons in the outermost shell.

The molecular geometry of CH₂S  is trigonal planar and the molecule is polar .

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.

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there are three sientific figures

exponents decimal multiplication

Significant figures are the digits in a number that carry meaningful information about its precision. The number 5.67 x 10⁶ has three significant figures.

Significant figures are the digits in a number that carry meaningful information about its precision. In this case, the digits 5, 6, and 7 are significant because they represent specific values.

The exponential notation (scientific notation) 10⁶ indicates that the number is multiplied by 10 to the power of 6, which means it is 5.67 million. The zeros at the end of the number are not considered significant; they are used to denote the scale of the value but do not add any additional precision.

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This diagram explains the relationship between atoms,moles and molecules.

moles ↔ molecules ↔ atoms                

Atoms are the building blocks of substances, and molecules are formed by distinct arrangements of atoms. A mole is a unit that enables us to express very large quantities of atoms or molecules. Models like the ball-and-stick aid in visualizing these relationships.

The relationship between atoms, moles and molecules can be seen in how each unit of matter interacts with each other. Atoms are the building blocks of substances, and molecules are formed by distinct arrangements of these atoms, typically of more than one element. In the model of an organic molecule, for example, atoms of carbon, hydrogen, nitrogen, oxygen, and sulfur are shown in proportional atomic size, and the chemical bonds indicated by silver rods demonstrate the connections between these atoms (Figure 2.1).

The molecular formula uses chemical symbols and subscripts to indicate the exact numbers of different atoms in a molecule or compound. An empirical formula, meanwhile, gives the simplest, whole-number ratio of atoms forming a compound (molecular orbital theory). When we talk about moles, this is a convenient unit for expressing very large numbers of atoms or molecules. The mass in grams of 1 mole of substance is known as its molar mass. Moreover, you have probably heard about Avogadro's number, which amounts to 6.022 x 10^23, the number of entities composing 1 mole of substance.

A concept that can help visualize these relationships is the ball-and-stick model, which shows the geometric arrangement of atoms within a molecule. This model also illustrates how molecules are three-dimensional, and can describe molecular bonds in terms of their distances, angles, and relative arrangements in space, providing a more in-depth understanding of molecular structure (molecular orbital diagram).

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so for shortest it would be x-rays, middle would be red visible light and longest would be infrared

the one with most energy would be gamma rays and the least would be radio waves i think.

A.) Electrical energy

is your answer

A.) Electrical

This was proven by Benjamin Franklin with his kite experiment.

24

Ddddd

Hope I helped

Answer: These are called as nuclear chain reactions.

Explanation: Nuclear Fission reactions are the reactions in which one heavier nuclei produces two lighter daughter nuclei.

Nuclear chain reactions are defined as the chemical reactions when one neutron released in a fission reaction produces another fission reactions in other nucleus. The other nucleus again releases neutrons and a chain of reactions is formed.

These reactions are generally uncontrollable.

Hence, The continuous release of nuclear energy caused when on fission reaction triggers more nuclear reactions is a nuclear chain reaction.

Consider the equation for weight:

W=mg

W is the weight, m is the mass, and g is the acceleration due to gravity.

Therefore, to calculate the weight of an object, just multiply its mass by the acc. due to gravity of the location.

The acc. due to gravity on Earth is approximately 9.81 ms^-2, note that this number may change from place to place, for example, the acc. due to gravity on moon is only 1/6 of Earth's. (Sometimes the question provides g as 10, so make sure you check the instructions before!)

W = 1.5 x 9.81

   = 14.715N (≈14.7N)

Therefore, the answer to this question is the last option (or D), 14.7N.

Answer:

Explanation:

Counting on the chain will be from the end where carboxylic group is attached. So, in a structure of 3-propyl-2-methyl-1-pentanoic acid, there is a

So, the structure will be drawn as image attached.

Chelation. Dimercaprol and dimercaptosuccinic acid are chelating agents that sequester the arsenic away from blood proteins and are used in treating acute arsenic poisoning. The most important side effect is hypertension. Dimercaprol is considerably more toxic than succimer.

 The empirical formula of the   compound is NO₂

calculation

Step 1: find the moles  of  Nitrogen and oxygen using the Avogadro's law constant

That is according to Avogadro's law   1 mole = 6.02 x 10²³  atoms

The  moles of nitrogen (N)  is calculated  as below

= 1  mole = 6.02 x 10²³ atoms

   ? moles= 1.11 x 10²²  atoms

by cross multiplication

= {(1 mole  x 1.11 x10²²  atoms)  / 6.02 x 10²³  atoms}  = 0.0184  moles

moles of oxygen  is calculated as below

1 mole  = 6.02 x 10 ²³  atoms

? moles= 2.22 x 10²² atoms

by cross multiplication

={ (1 mole x 2.22 x 10²² atoms) / 6.02 x 10²³}  = 0.0369 moles

Step 2: find the mole ratio  of N to O by dividing each mole by smallest number of mole (0.0184)

That is;

        for  N  = 0.0184 /0.0184 = 1

       for O =0.0369/0.0184  =2

Therefore the empirical formula = NO₂

The empirical formula is [tex]H_2SO_4[/tex] .

It is the simplest ratio of atoms of elements in a compound. So, the empirical formula is [tex]H_2SO_4[/tex] . The given formula is already in its simpler form.

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Final answer:

The empirical formula for sulfuric acid (H₂SO₄) is H₂SO₄ because the formula is already at its simplest whole-number ratio which cannot be reduced further.

Explanation:

The empirical formula for sulfuric acid (H₂SO₄) is simply its simplest formula, which defines the relative proportions of each type of atom in the substance. An empirical formula is based on the smallest whole-number ratios of atoms in a compound. In the case of H₂SO₄, the empirical formula is the same as its molecular formula because it cannot be reduced to smaller whole-number ratios. Sulfuric acid consists of two hydrogen (H) atoms, one sulfur (S) atom, and four oxygen (O) atoms.

The empirical formula shows the simplest ratio of elements in a compound. In most cases, this is not necessarily the actual number of atoms present in a molecule of the compound, but for H₂SO₄, the empirical formula and molecular formula are identical. To derive an empirical formula, you would normally divide the moles of each element by the smallest number of moles to get a whole-number ratio, but with sulfuric acid, no division is necessary as it is already in the lowest terms.

The composition of the ocean floor can be described as option A. Basalt covered in sediment

Basaltic rocks are the main type of rock on the ocean floor. They are made from cooled lava. Basalt is a kind of rock that has a lot of iron and magnesium. It looks dark and smooth. It forms most of the bottom layer of the ocean.

The ocean floor has different types of stuff called sediments covering it. These sediments can come from land, like rocks breaking down and being carried away, or from sea creatures, like shells and skeletons collecting on the ocean floor.

Hence option a is correct.

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see full text below

Which describes the composition of the ocean floor?

A. Basalt covered in sediment

B. Sediment covered in basalt

C. Granite covered in sediment

D. Basalt covered in granite

The equation Mg + HCl = MgCl2 + H2 represents a chemical reaction where magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2). This is also an example of a redox reaction, where magnesium is oxidized and hydrogen is reduced.

The equation Mg + HCl = MgCl2 + H2 represents a chemical reaction where magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2). The equation tells us that one mole of magnesium reacts with two moles of hydrochloric acid to produce one mole of magnesium chloride and one mole of hydrogen gas - this can be seen as an example of single displacement reaction.

This process is also an example of a redox reaction, in which magnesium is oxidized and hydrogen in HCl is reduced.

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the balanced equation is:

CH4 +2O2  -> CO2+2H2O

Answer:

[tex]\huge \boxed{\mathrm{CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O}}[/tex]

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

Explanation:

[tex]\sf CH_4+ O_2 \Rightarrow CO_2 + H_2O[/tex]

Balancing the Hydrogen atoms on the right side,

[tex]\sf CH_4+ O_2 \Rightarrow CO_2 +2 H_2O[/tex]

Balancing the Oxygen atoms on the left side,

[tex]\sf CH_4+ 2O_2 \Rightarrow CO_2 +2 H_2O[/tex]

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

Answer

The distance walked would be the total amount of her movement.  

4 steps+3 steps=7 steps

The displacement is how far from her original location the girl is.  

4 steps-3 steps=1 step.

C) 7, 1

Hope this helps!!

Answer:

The first one is energy.

The second one is specific heat.

Explanation:

Platos answer

First there is a need to calculate the molar mass of Ba(NO₃)₂:

137.3 + 2 (14.0) + 6 (16) = 261.3 grams/mole

The molar mass, denoted by M in chemistry refers to a physical characteristic illustrated as the mass of a given component divided by the amount of the component. The molar masses are always denoted in grams/mole.

After finding the molar mass, the number of moles can be identified as:

432 grams / 261.3 g/mol = 1.65 moles of Ba(NO₃)₂.

The number of moles in 432g of Ba(NO₃)₂, is 1.653.

To calculate the number of moles in 432g of Ba(NO₃)₂, we first need to find its molar mass. The molar mass of Ba(NO₃)₂ is calculated as follows:

Therefore, the molar mass of Ba(NO₃)₂ is 261.3 g/mol.

Next, we use the formula for the number of moles:

So, the number of moles of Ba(NO₃)₂ in 432g is:

the answer would be 3.340 g/cm3

By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.

The atomic mass of an element is calculated by taking the weighted averages of naturally occurring isotopes of that element. C is the correct option among the given options.

Atomic mass, also known as atomic weight, refers to the average mass of atoms of an element. It is a relative measure that compares the mass of an atom to the mass of a reference atom. The atomic mass is typically expressed in atomic mass units [tex](amu)[/tex] or unified atomic mass units [tex](u).[/tex]

This means that, the atomic mass of an element is calculated by taking into account the abundance of each isotope of the element and its atomic mass. A weighted average is an average in which each value to be averaged is multiplied by a factor reflecting its importance, and the resulting products are added together and then divided by the sum of the factors.

Therefore, the weighted averages of naturally occurring isotopes of that element is referred as atomic mass. Option C is the correct option.

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Answer is: d.) in a closed system.

Conservation of mass: during chemical reaction no particles are created or destroyed, the atoms are rearranged from the reactants to the products.

Closed system is a physical system that does not allow transfer of mass and energy in or out of the system.

For example, chemical reaction: 2CH₃OH + 3O₂ → 2CO₂ + 4H₂O.

1) There are four hydrogen atoms, one carbon atom, four oxygen atoms in this chemical reaction.

2) There are eight hydrogen atoms, two carbon atoms, eight oxygen atoms in this chemical reaction.

To study the law of conservation of mass, a closed system is ideal because it prevents mass from entering or exiting, allowing for accurate observation of matter transformation.

The best way to study the law of conservation of mass is in a closed system. A closed system does not allow the exchange of matter with its surroundings, ensuring that mass can neither enter nor leave the system. This creates an ideal environment to observe that matter is neither created nor destroyed but only transformed in chemical reactions.

For example, if you bake dough in a closed system like a sealed container, the mass of the dough before and after baking would remain the same, despite the release of gases that cause the dough to rise. The total mass of the reactants (dough) equals the total mass of the products (bread and gases), thereby complying with the law of conservation of mass.

Answer : The grams of carbon monoxide needed are 148.89 g

Solution : Given,

Mass of iron, Fe = 198.5 g

Molar mass of iron, Fe = 56 g/mole

Molar mass of carbon monoxide, CO = 28 g/mole

First we have to calculate the moles of iron, Fe.

[tex]\text{ Moles of Fe}=\frac{\text{ Mass of Fe}}{\text{ Molar mass of Fe}}=\frac{198.5g}{56g/mole}=3.545moles[/tex]

The balanced chemical reaction is,

[tex]Fe_2O_3(s)+3CO(g)\rightarrow 3CO_2(g)+2Fe(s)[/tex]

From the balanced reaction, we conclude that

2 moles of iron produces from the 3 moles of carbon monoxide

3.545 moles of iron produces from the [tex]\frac{3}{2}\times 3.545=5.3175[/tex] moles of carbon monoxide

Now we have to calculate the mass of carbon monoxide, CO.

[tex]\text{ Mass of CO}=\text{ Moles of CO}\times \text{ Molar mass of CO}[/tex]

[tex]\text{ Mass of CO}=(5.3175moles)\times (28g/mole)=148.89g[/tex]

Therefore, the grams of carbon monoxide needed are 148.89 g

The kinetic energy and the physical state of water depend strongly on the temperature;

As the temperature increases, the speed of colliding molecules increases and the kinetic energy increases.

The equation for this question could be [tex]2KClO_{3}[/tex]→[tex]2KCl+3O_{2}[/tex] .

so for 6.75 moles of [tex]KClO_{3}[/tex]  *3 moles of O_{2}/2 moles of [tex]KClO_{3}[/tex]

= 10.125

Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. ... This allows the water molecule to become attracted to many other different types of molecules.

 The grams  of NaCl   that needed  to make 1L  of a 0.1 M solution  is  

5.845 g (answer C)

 calculation

Step 1: find the  moles of NaCl

moles  = molarity  x  volume  in liters

molarity = 0.1 M =0.1 mol/l

= 1 L x 0.1 Mol/L = 0.1 moles

Step 2: find  the   mass  NaCl

mass =  moles x  molar mass

From  periodic  table   the molar mass of NaCl  = 23 +35.45 =58.45 g/mol

mass= 0.1 moles  x 58.45 g/mol =5.845 g appropriate ( answer C)

To calculate the number of grams of NaCl that would be needed to make 0.1 M of solution we have to calculate;

im very postive it is aluminum oxide (;

Hello There,

The answer is:

aluminum oxygen

Hope this help have a great day :)