What is 0.045 rounded to the nearest hundredth?

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Fire is burning, which is combustion, and combustion is a type of oxidation reaction. Oxidation means combined chemically with oxygen . Oxidation is an exothermic reaction, meaning it gives releases heat energy.

for a is burning. which is combustion and that is a type of oxidation means to combine chemically with oxygen.

the rotational motion of the Earth and its iron core-

Final answer:

The Earth's magnetic field is created by the motion of the Earth's liquid iron outer core, driven by thermal and compositional currents, and the rotational motion of the Earth. This generates electrical currents that are responsible for the magnetic field, making answer D. the rotational motion of the Earth and its iron core the correct one.

Explanation:

Earth's magnetic field is primarily generated by the convective movements of molten metal within its outer core. This movement, coupled with the Earth's rotation, produces electrical currents that generate the magnetic field. These currents of liquid iron create dynamic magnetic fields through a self-sustaining process involving Ampère's law and Faraday's law, which describe the interplay between electric currents and magnetic fields.

This activity in the Earth's outer core is what results in the geomagnetic field that extends far into space, providing a shield against harmful radiation from the sun, including plasma from the solar wind, and contributing to phenomena like the Aurora Borealis.

Therefore, the correct answer is D. the rotational motion of the Earth and its iron core.

Answer:

Reaction Rate

Explanation:

It means change in concentration of reactants or change in concentration of products per unit time.

Answer:

Reaction rate refers to the speed at which reactants are converted into products.

Explanation:

The complete question is:

"Which term refers to the speed at which reactants are converted into products?

A) reaction rate

B) activation energy

C) meta stable state

D) spontaneous reaction"

In a chemical process, substances called reactants are transformed into products as time passes. The reaction rate is defined as the change in the concentration of one of the reagents or products, in a time interval in which the change takes place. In other words, the speed of a chemical reaction is the speed with which products are formed (or with which reagents disappear).

Chemical kinetics is the area within physical chemistry that is responsible for studying the speed of a reaction, the factors that affect the speed of the reaction, and the mechanism that follows the reaction.

Reaction rate refers to the speed at which reactants are converted into products.

Your answer will be B because sodium and chlorine and both elements and two elements combine to make a compound

Answer : The correct option is, (B) element; element; compound

Explanation :

Mixture : It is defined as the substance that is made by the combination of two or more different components.

Pure substance : It is defined as a substance that is made by the combination of only one type of atom or only one type of molecule.

Compound : It is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Element : It is a pure substance which is composed of atoms of similar elements.

As per question, the sodium is the element that combines with the chlorine element to form sodium chloride as a compound.

Hence, the correct option is, (B) element; element; compound

Answer:

for table C

Explanation:

What is the concentration of H+ ions at a pH = 11?

1.  ⇒ 0.00000000001 mol/L  

What is the concentration of H+ ions at a pH = 6?

2.  ⇒ 0.000001 mol/L  

How many fewer H+ ions are there in a solution at a

pH = 11 than in a solution at a pH = 6?

3.  ⇒ 100,000

The concentration of H+ ions at pH 11 is 1.0 x 10^-11 mol/L and at pH 6 is 1.0 x 10^-6 mol/L. There are 100,000 times fewer H+ ions at a pH of 11 than at a pH of 6.

The concentration of H+ ions in a solution can be calculated using the pH value, which is the negative logarithm (base 10) of the hydrogen ion concentration. Therefore, pH = -log[H+], and to find [H+], we can use the inverse logarithmic relationship: [H+] = 10^-pH.

For a solution with a pH of 11, the concentration of H+ ions would be: [H+] = 10^-11 mol/L, which equals 1.0 x 10^-11 mol/L.

For a solution with a pH of 6, the concentration of H+ ions would be: [H+] = 10^-6 mol/L, which equals 1.0 x 10^-6 mol/L.

To find how many fewer H+ ions are in a solution with a pH of 11 compared to a pH of 6, we divide the two concentrations: (1.0 x 10^-11 mol/L) / (1.0 x 10^-6 mol/L) = 1.0 x 10^-5. This means that the solution with a pH of 11 has 100,000 times fewer H+ ions than the solution with a pH of 6.

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Answer:

The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].

Explanation:

The pH of the solution is defined as negative logarithm of [tex]H^+[/tex] ion concentration.

[tex]pH=-\log[H^+][/tex]

The pH of the nitric acid solution = 3.75

[tex]3.75=-\log[H^+][/tex]

[tex][H^+]=Antilog [-3.75]=0.0001778=1.778\times 10^{-4} M[/tex]

The concentration of [tex]H^+[/tex] ions in the solution is [tex]1.778\times 10^{-4} M[/tex].

Answer:

1st Question: 1.78 / -4

2nd Question: A

Explanation:

Source: Dude trust me

I’m not sure exactly what question you’re trying to ask, but I’ll give two answers:

1. The mass is reported as 35.5 amu because atomic weights are reported based on the weights and abundances of the isotopes of that element. For example, Hydrogen (which is typically understood to have only one proton, aka 1 amu) has a weight of 1.004 amu. This is because heavier isotopes of this element do exist but in very small quantities; however, they can still influence the “averaged” weight.

2. The weight of an atom is intrinsic based on its makeup - the number of each component influence the overall weight of the atom. In this case, Chlorine is comprised of the right number of protons and neutrons in the right occurrence and organization such that a weight of 35.5 amu is reported.

Hope this helps!

A gas in a liquid

Final answer:

A decrease in pressure has the greatest effect on solutions containing gases, as it causes a decrease in gas solubility, leading to the escape of gas from the solution, such as carbon dioxide bubbling from an opened soda can.

Explanation:

A decrease in pressure has the greatest effect on a solution that contains gases. This is because gases are highly responsive to changes in pressure, as described by gas laws. An increase in pressure leads to a decrease in gas volume, hence an increase in gas concentration in solution. When pressure is decreased, the reverse happens, and gas solubility decreases.

Consider opening a soda can; as the pressure above the liquid decreases, the carbon dioxide escapes due to the reduced solubility, causing bubbling. Therefore, solutions with dissolved gases, much like carbonated beverages, are the most affected by changes in pressure. This phenomenon is crucial in understanding the behavior of gas-liquid systems.

Specific Heat is the measure that how quickly or slowly a substance heats or cools.

Specific Heat is defined as the amount of required to raise the temperature of a substance by 1 degree Celsius.

The units of specific heat are usually calories or joules per gram per Celsius degree.

Specific Heat for water is 1 cal/gm /degree Celsius

Specific Heat is the measure that how quickly or slowly a substance heats or cools.

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The boiling point of HF is 67.1°F and H2 is -423.2°F so HF is HIGHER than H2 and N2 boiling point is -320.4°F so HF is again HIGHER than N2.

Answer:

Boiling point of HF is greater than both H₂ and N₂.

Explanation:

Boiling point is the temperature at which the vapour pressure of a liquid becomes equal to atmospheric pressure.

Higher the intermolecular force of attractions between molecules of liquid, higher the boiling point.

Hydrogen molecule and nitrogen molecules are non polar covalent molecules. They have weak london dispersion forces in between them.

However in HF there is intermolecular hydrogen bond, which makes the HF molecule to have higher boiling point than both of them.

B. Helium

It has only He atoms

Answer:

right - towards the products.

Explanation:

By removing oxygen from the reaction, this means that the concentration of the products is decreased.

To attain the equilibrium again, the reaction is shifted toward the products side.

So, the right choice is: right - towards the products.

Answer:

Explanation:

I think its B...

That would be vegetables rotting and boiling an egg. . The others are physical changes.

In an ideal gas law, n represents number of gas molecules in given amount of gas at constant pressure with constant temperature.

Final answer:

In the ideal gas law, the variable 'n' represents the number of moles of a gas, which is essential in calculating the state of an ideal gas along with pressure, volume, and temperature.

Explanation:

In the ideal gas law, represented by the equation PV = nRT, the variable n stands for the number of moles of a gas. The ideal gas law restates the various individual gas laws into a single unified equation, which allows for the calculation of the state of an ideal gas when the pressure (P), volume (V), temperature (T), and number of moles (n) are known. The universal gas constant (R) relates these quantities and is a product of Avogadro's number (NA) and the Boltzmann constant (k).

Answer:

Terrae  

Explanation:

The mountainous parts of the moon are referred as Terrae. These are bright regions on the moon. Most of the surface of the moon is covered these highlands.

Craters are the depressions created on the surface of the moon as the space rocks strike.

Maria are the dark areas on the surface of the moon. These areas are filled with solidified lava.

Regolith constitutes the upper loose layer of soil, dust, broken rocks and other materials.

Answer:

480.40 g.

Explanation:

2 SO₂(g) + O₂(g) → 2 SO₃(g),

it is clear that 2.0 moles of SO₂ react with 1.0 mole of oxygen to produce 2.0 moles of SO₃.

∵ 2.0 moles of SO₂ produce → 2.0 moles of SO₃, from the stichiometry.

∴ 6.0 moles of SO₂ produce → 6.0 moles of SO₃.

mass =  no. of moles x molar mass of SO₃ = (6.0 moles)(80.066 g/mol) = 480.396 g ≅ 480.40 g.

cations are formed when a metal loses electrons, and a nonmetal gains those electrons.

The answer is:

D.[tex]C_{4}H_{4}S[/tex]

The empirical formula of a compound is the simplest formula of the same compound, if we are given the molecular formula, we can calculate the empirical formula by finding the mole ratio of each element of the compound.

So, if we know the empirical formula we will be able to get the molecular formula by multiplying it by the mole ratio.

Then, which of the options can give as a result the given molecular formula?

The answer will be D.[tex]C_{4}H_{4}S[/tex] because if we multiply it by 2(mole ratio), it will give us as a result : [tex]C_{8}H_{8}S_{2}[/tex]

[tex]2*(C_{4}H_{4}S)=C_{8}H_{8}S_{2}[/tex]

Have a nice day!

The fraction is calculated like this:

[tex] \frac{1}{ {2}^{50 \div 10} } = \frac{1}{32} [/tex]

If you want an universal equation for all problems like this:

[tex] \frac{1}{ {2}^{time \div halflife} } [/tex]

The fraction of the original mass of the radioactive isotope with a half-life of 10 years that will remain after 50 years is 1/32.

We can find the fraction of the original mass with the exponential decay equation:

[tex] N(t) = N_{0}e^{-\lambda t} [/tex]  (1)

Where:

N(t): is the amount of radioactive isotope at time t

N₀: is the initial amount of radioactive isotope

λ: is the decay constant

t: is the time = 50 y

We can find the decay constant as follows:

[tex] \lambda = \frac{ln(2)}{t_{1/2}} [/tex]   (2)

Where:

[tex]t_{1/2}[/tex]: is the half-life of the isotope = 10 y

The decay constant is (eq 2):

[tex] \lambda = \frac{ln(2)}{t_{1/2}} = \frac{ln(2)}{10 y} = 0.069 y^{-1} [/tex]

Now, the fraction of the original amount is (eq 1):

[tex] \frac{N(t)}{N_{0}} = e^{-\lambda t} = e^{-0.069 y^{-1}*50 y} = 0.0317 [/tex]

Since we need to calculate the fraction of the original mass, after some algebraic operations we have:

[tex] \frac{N_{0}}{N(t)} = 32 [/tex]  

[tex] N(t) = \frac{1}{32}N_{0} [/tex]                          

Therefore, the fraction of the original mass that will remain is 1/32.

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I think this is the answer but he did the oil drop experiment, i hope this helps

Answer:

he used voltage adjustments to make charged oil drops float.

Explanation:

just did it on apex

As he began to teach inorganic chemistry, Mendeleev could not find a textbook that met his needs. Since he had already published a textbook on organic chemistry in 1861 that had been awarded the prestigious Demidov Prize, he set out to write another one. The result was Osnovy khimii (1868–71; The Principles of Chemistry), which became a classic, running through many editions and many translations. When Mendeleev began to compose the chapter on the halogen elements (chlorine and its analogs) at the end of the first volume, he compared the properties of this group of elements to those of the group of alkali metals such as sodium. Within these two groups of dissimilar elements, he discovered similarities in the progression of atomic weights, and he wondered if other groups of elements exhibited similar properties. After studying the alkaline earths, Mendeleev established that the order of atomic weights could be used not only to arrange the elements within each group but also to arrange the groups themselves. Thus, in his effort to make sense of the extensive knowledge that already existed of the chemical and physical properties of the chemical elements and their compounds, Mendeleev discovered the periodic law.

Dimitri Mendeleev was the most noted Russian chemist who gave the periodic table. He gave the periodic table based on the atomic numbers and how they characterized the physical and chemical properties of the elements.

Therefore, he discovered the periodic table.

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Answer:

2.138 I think

Explanation:

N2 + 3H2 -> 2NH3

This means that 3 moles of H2 gives 2 moles of NH3

Lets convert 12.12 g of NH3 into moles.

The molecular weight of NH3 is 17 g/mol

So 12.12 g is 0.713 moles

If 2 NH3 comes from 3 moles of H2

1 mole comes from 1.5 moles of H2

So 0.713 moles of NH3 comes from 1.5 x 0.713 moles of H2 =1.069 moles of H2

1 mole of H2 weights 2g

So 1.069 moles of H2 weighs 2.138 g

You can find the number of neutrons in an atom by subtracting the atomic number from the mass number.

The mass number of an atom is the total number of protons and neutrons in the nucleus of the atom. The atomic number of an atom is the number of protons in the nucleus of the atom. Both the mass number and the atomic number can be found on the periodic table of elements.

To find the number of neutrons in an atom therefore, you can use the following formula:

Number of neutrons = Mass number - Atomic number

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I would say the answer is A.

Concentration Definition. In chemistry, concentration refers to the amount of a substance per defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration usually is expressed in terms of mass per unit volume.

B solids made of atoms

Solids with the highest melting points are typically those with either covalent networks or ionic bonds, due to the strength of their atomic or ionic interactions.  So the correct option is C.

The type of solid that often has the highest melting points are those made of atoms arranged in a covalent network or those formed by ionic bonds. Solids that consist of ionic bonds, such as sodium chloride (NaCl), typically have high melting points due to the strong electrostatic interactions between the positively and negatively charged ions within a crystal lattice. Similarly, materials with a covalent network, like diamond or silicon dioxide (SiO2), have very high melting points because they consist of a three-dimensional array of covalently bonded atoms that require a lot of energy to break apart. In contrast, molecular solids composed of nonpolar or polar molecules have lower melting points due to their weaker intermolecular forces, such as London dispersion forces, dipole-dipole interactions, and in some cases, hydrogen bonding.

What is it that you’re asking for?

Answer:

Where is the chart

Explanation: