What do any two samples of the element mercury (Hg) have in common?
A.the same mass
B.the same volume
C.the same type of atoms
D.the same number of electrons

Answer:

If a solution has pH=8 , then its pOH is 14−8=6 and the corresponding concentration of hydroxyl OH− ions is 10−6 mol per litre.

Explanation:

The statement "Superficial zone chondrocytes can get compacted under physiological loading: a multiscale finite element analysis" is true.

Superficial zone chondrocytes are the most exposed to mechanical loading and are therefore at risk of being compacted under physiological loading. A multiscale finite element analysis can be used to model and predict the mechanical behavior of cartilage under physiological loading, allowing for a better understanding of the factors that affect its mechanical properties.

This means that chondrocytes in the superficial zone of cartilage are at risk of being compacted under the physiological loading that it experiences in everyday life. A multiscale finite element analysis can be used to model and predict the mechanical behavior of cartilage under physiological loading, allowing for a better understanding of the factors that affect its mechanical properties.

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Answer:

\(\boxed {\boxed {\sf 2 K + Cl_2 \rightarrow 2KCl}}\)

Explanation:

The law of conservation of mass states that mass cannot be created or destroyed. The mass of the reactants must equal the mass of the products. Basically, the number of atoms at the beginning is the same as the end.

Count up the atoms on the left and right sides of the arrow. Remember to account for coefficients and subscripts.

1. 2Fe+3O₂⇒Fe₂O₃

Right: 2Fe + 3O₂

Left: Fe₂O₃

2. 2H₂+ O₂ ⇒ 2H₂O₂

Right: 2H₂+O₂

Left: 2H₂O₂

3. 2K+Cl₂⇒ 2KCl

Right: 2K + Cl₂

Left: 2KCl

4. C+O₂ ⇒ 2CO

Right: C+O₂

Left: 2CO

The only balanced equation that follows the conservation of mass is choice 3: 2K+Cl₂ ⇒2KCl

Answer: 57.8g

Explanation:

We can find molar mass by adding up the masses of each component, nitrogen is 14 and hydrogen is 1, this gives us 17g/mol.

Multiplying molar mass by number of moles will give us the grams in that many moles, 3.4x17=57.8g.

Answer:

H - Hydrogen

He - Helium

Li - Lithium

Be - Beryllium

B - Boron

C - Carbon

N - Nitrogen

O - Oxygen

F - Fluorine

Ne - Neon

Na - Sodium

Mg - Magnesium

Al - Aluminum

Si - Silicon

P - Phosphorus

S - Sulfur

Cl - Chlorine

Ar - Argon

K - Potassium

Ca - Calcium

Explanation:

Answer:1 Hydrogen H

2 Helium He

3      Lithium Li

4 Beryllium Be

5 Boron B

6 Carbon C

7 Nitrogen N

8 Oxygen O

9 Fluorine F

10 Neon Ne

11 Sodium Na

12 Magnesium Mg

13 Aluminum Al

14 Silicon Si

15 Phosphorus P

16 Sulfur S

17 Chlorine Cl

18 Argon Ar

19 Potassium K

20 Calcium Ca

Explanation:

Answer: what is the relationship between protein and lipid metabolism?

On the short term increasing dietary protein in healthy subjects improved lipid metabolism, as seen by lower TG and IHL levels, but no glucose metabolism. On the long term ,however ,a high protein intake was related to a fatty liver, and associated to insulin resistance.

Explanation: Hope this helps

Answer:

I think it's Hydrogen is equal to aCalcuim plus b

Answer:

Explanation:

2Al(s) + 3 2 O2(g) → Al2O3(s) And given the stoichiometry ...and EXCESS dioxygen gas...we would get 6.25⋅ mol of alumina. the which represents a mass... ...6.25 ⋅ mol ×101.96 ⋅ g ⋅ mol−1 molar mass of alumina ≡ 637.25 ⋅ g.

Answer:

56.7 grams of aluminum oxide (AI²O³) are produced.Need a fast expert's response.

Answer:

D

Explanation:

Its in first person

Answer:Physical changes involve states of matter and energy. No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Physical changes occur when substances are mixed but don't chemically react.

Explanation:

Answer:

1.  \(Hf:[Kr]4f^{14}5d^26s^2\)

2. The valence electrons are 4.

3. Due to poor shielding of inner electrons.

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.  

The element Hafnium (Hf) has atomic number of 72 and the nearest noble gas is Krypton has 36 electrons.

The electrons are filled according to Afbau's rule in order of increasing energies.

\(Hf:72:[Kr]4f^{14}5d^26s^2\)

As Hafnium is a d block element amd it has 2 electrons in 5d and 2 electrons in 6s.

The eletrons in 5d and 4f are poorly shielded by the inner electrons and thus experience strong nuclear charge and thus do not participate in bonding.

By solving the equation we get:NaHCO3 has a molecular mass   84 g/mol.

Na2CO3 has a molecular weight of 0.02 mol.

Mass of Na2CO3 = **2.12 g**

Daltons or atomic mass (Da or u) are used to measure molecular mass, which is the mass of a certain molecule1. The molecular mass indicates a molecule's mass in relation to the 12 C atom, whose mass is assumed to be 12. The molar mass, which is stated in g/mol1, is the mass of a particular material divided by the amount of that substance. Hence, the molecular mass is the mass of a single particle or molecule, whereas the molar mass is the average of numerous particles or molecules

The equation below illustrates how heating causes sodium hydrogencarbonate to break down:

Na2CO3(s) + H2O(g) + CO2 = 2 NaHCO3(s) (g)

a) I The formula: can be used to determine how many moles of sodium hydrogencarbonate were utilised.

Molar mass = mass times the number of moles

NaHCO3 has a molecular mass of (23 + 1 + 12 + 48) g/mol, or 84 g/mol.

3.36 g of NaHCO3 divided by 84 grammes per mole yields 0.04 moles.

ii) Stoichiometry can be used to calculate the quantity of sodium carbonate produced:

We can deduce from the balanced equation that 2 moles of NaHCO3 result in 1 mole of Na2CO3.

Na2CO3 has a molecular weight of (0.04 mol 2 mol) 1 mol = 0.02 mol.

iii) The formula Mass = Number of moles Molar mass can be used to determine the mass of sodium carbonate produced.

molar volume of Na2CO3 = (23 × 2 + 12 + 48) g/mol = 106 g/mol

Mass of Na2CO3 = 0.02 mol × 106 g/mol = **2.12 g**

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Answer:

B. The substances that are formed

Explanation:

a chemical reaction is a reaction that there's a formation of a new compound or substance.

can i have brainliest? and btw, let me know if you get it right! hope i helped <3

The amount of matter stays the same between the substances,

The molecules in a copper penny is closely packed and and has no space to move apart thus the material will be denser than that in the molten state. That's why the penny sink in the molten copper.

Copper is a transition metal exhibiting all the metallic properties. The molten state of metals is the fluid state where the molecule are not strongly held by the metallic bonds.

Molten material is made by melting them and the liquid like state contains molecules with some space to move apart. Whereas, in solid state as in a copper penny, the molecules are closely packed and have no space to move apart.

An object will sink in a liquid if it is less dense than the liquid. Copper penny is denser than the molten copper because the molecules are densely packed and it will sink on to it.

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Answer:

A.) Thermal

Explanation:

I got it correct on founders edtell

Answer:

an organic compound made by replacing the hydrogen of an acid by an alkyl or other organic group. Many naturally occurring fats and essential oils are esters of fatty acids

Explanation:

ester, any of a class of organic compounds that react with water to produce alcohols and organic or inorganic acids. Esters derived from carboxylic acids are the most common. The term ester was introduced in the first half of the 19th century by German chemist Leopold Gmelin

Answer: 50mL

Explanation: This is solved just like you'd solve a proportion in mathematics. But first, you need to make your temperature values have the same units. It is ideal to have both units in K almost 90% of the time. So to convert the values, you'll add 273 to your Celsius temperature: 27. This gives you 300. Then, you set 300K/25mL = 600K/?. We see that to get from 300 to 600, we just double our values. Therefore, we'll do the same to the 25mL. This gives us 50mL.

I hope this helps!

Answer:

Explanation:

Small changes in the chemical nature of polysaccharides can make a big difference in how they work in our bodies. Polysaccharides are complex carbohydrates found in things like fiber and medicines. Even tiny changes in their structure can affect how they are digested, how they interact with cells, and their overall impact on our health. Scientists can use these changes to create materials with specific properties or develop new treatments. So, even small tweaks in polysaccharides can have a significant impact on how they function in our bodies.

From the calculation and the value of the free energy change(-91 kJ/mol), the reaction is spontaneous.

The sign of the free energy change determines whether the reaction will be spontaneous or not. A reaction is spontaneous only when the free energy change is negative.

Using;

ΔG=  ΔH -  TΔS

ΔG= 176 kJ/mol - [937 K *  0.285 kJ/ (mol K)]

ΔG=-91 kJ/mol

Hence, the reaction is spontaneous.

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Answer:

d

Explanation:

yes

Answer: Divergent boundaries -- where new crust is generated as the plates pull away from each other. Convergent boundaries -- where crust is destroyed as one plate dives under another. Transform boundaries -- where crust is neither produced nor destroyed as the plates slide horizontally past each other.

Explanation:

earthquakes volcanos n stuff like that

Answer:

Explanation:

The relation between average velocity of a gas molecules and its molecular mass is as follows .

average velocity v

\(v = k \sqrt{\frac{1}{M} }\) where k is a constant .

If v₁ and v₂ be the velocities corresponding to molecular masses 349 and 352 .

\(\frac{v_1}{v_2 } = \sqrt{\frac{M_2}{M_1} }\)

\(\frac{v_1}{v_2 } = \sqrt{\frac{352}{349} }\)

= 1.004

Answer:

The answer is A. Aquifer

Explanation:

It stores groundwater.

The atoms have different types of bonds holding molecules together and leads to evaporation.

Thus, A crucial stage in the Earth's water cycle is evaporation, which is the process by which water transforms from a liquid to a gas or vapor. Evaporation at the molecular level requires the interface to break at least one extremely strong intermolecular connection between two water molecules.

The chemical mechanism by which an evaporating water molecule acquires sufficient energy to escape from the surface has remained mysterious despite the significance of this activity.

Here, we demonstrate that the high kinetic energy of the evaporated water molecule is enabled by a precisely timed formation and dissolution of hydrogen bonds involving at least three water molecules at the interface, the recoil of which allows one water molecule to escape.

Thus, The atoms have different types of bonds holding molecules together and leads to evaporation.

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The graphs which use axes both labeled with quantitative values and show individual points of data include:

Thus is defined as a pictorial representation of data or variables in an organized or definite manner.

The graphs mentioned above always have each point matching with one value on the x-axis and one value on the y-axis.

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The word equations tells us that the combination of copper oxide and sulfuric acid produces copper sulfate and water

A word equation is a way to represent a chemical reaction using words instead of chemical formulas or symbols. It describes the reactants and products of the reaction in a clear and understandable manner as we see in the question that was shown as equation.

Note that the copper oxide and the sulfuric acids are the reactants that are combined and the copper sulfate and the water are the products.

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Answer:

D. Hurricanes form as a result of rising warm air and circulating winds​

Explanation:

Yes, that statement is generally correct. A scientific law is a statement that describes a phenomenon or pattern in nature, often expressed mathematically, without attempting to explain why it occurs. A scientific theory, on the other hand, is a well-substantiated explanation for a set of phenomena, based on empirical evidence and scientific reasoning.

A scientific law summarizes what happens in a particular situation, often in the form of an equation or formula, whereas a scientific theory attempts to explain why it happens.

For example, the law of gravity describes the attraction between masses, but it does not explain why this attraction occurs. In contrast, the theory of general relativity attempts to explain the underlying principles of gravity, including its effects on the curvature of space-time.

It's worth noting that both scientific laws and scientific theories are based on empirical evidence, but they serve different purposes in scientific inquiry. Laws describe what happens in a particular situation, while theories attempt to explain why it happens.

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Answer:

48.9 or 49.0 g of sulfuric acid

Explanation: