What is the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0oC?

Explanation:

Balancing equation

Explanation:

In the given reaction, sodium is reacting with chlorine to produce sodium chloride

The chemical equation involved is

Na+Cl_2\rightarrow NaClNa+Cl2→NaCl

When the number of atoms for the reactant side is calculated it gives:

Na = 1

Cl = 2

When the number of atoms for the product side is calculated it gives:

Na = 1

Cl = 1

The obtained result indicates that the Chlorine atom is not equal on both sides. Thus the reaction is not balanced.

The balanced reaction has the number of atoms involved in reaction in reactants as well as the product is equal.

To make both side equal some changes must be made as shown in the balanced equation is

2Na+Cl_2\rightarrow 2NaCl2Na+Cl2→2NaCl

For the above equation, the number of atoms in the reactants is:

Na= 2

Cl = 2

The number of atoms in products is:

Na = 2

Cl = 2

As the number of atoms in the reactants side is equal to the number of atoms in the product side, the reaction is balanced.

Answer:

B

Explanation:

Answer:

B

Explanation:

Answer:

Explanation:

After fossils are buried, how do they get to the surface to be discovered? That's right, the only way for those sediments to reach the surface is for them to be pushed up during the process of mountain making and then worn away by the forces of erosion.

Fossils form in sedimentary layers or rock layers from specific periods when favorable conditions permit preservation of bones, teeth, and sometimes impressions of the organism. Geological activities, such as erosion and plate tectonics, along with climate change, can eventually bring these fossils back to the surface.

Fossils, which provide solid evidence of organisms from the past, are typically found in sedimentary layers located next to bodies of water or in rock layers dating back to periods such as the Permian period. Upon death, an organism's body decomposes, leaving mostly teeth and bones, which under specific conditions can become fossilized through processes involving materials like volcanic ash, limestone, and mineralized groundwater.

Geological activity, such as erosion, weathering surface layers, and plate tectonics can eventually bring these fossils back to the surface. Climate change can also expose fossils, as seen when perennial snow covering Greenland melted to reveal geologic evidence of ancient life. These methods allow us to discover fossils of organisms ranging from bivalves and trilobites to early vertebrate bones.

The study and categorization of these fossils from all over the world allows scientists to determine when these organisms lived relative to each other, creating a fossil record that narrates the story of life's evolution on our planet.

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Answer:

C₂ = 0.02 M

Explanation:

Given data:

Initial volume of solution = 0.1 L

Initial molarity = 0.1 M

Final volume = 0.5 L

Final concentration = ?

Solution:

Formula:

C₁V₁ = C₂V₂

C₁ = Initial volume of solution

V₁ = Initial molarity / concentration

C₂ = Final concentration

V₂ = Final volume

Now we will put the values in formula.

C₁V₁ = C₂V₂

0.1 M × 0.1 L =  C₂ × 0.5 L

0.01 M.L = C₂ × 0.5 L

C₂ = 0.01 M.L /  0.5 L

C₂ = 0.02 M

Final answer:

Using the dilution formula M1V1 = M2V2, we determined that the final concentration of the solution that was initially 0.1 M and dilutes from 0.1 L to 0.5 L is 0.02 M.

Explanation:

To determine the concentration of a solution that started out as 0.1 L of a 0.1 M solution and ended with a final volume of 0.5 L, we use the concept of dilution, which is expressed with the formula M1V1 = M2V2, where M1 and V1 are the concentration and volume of the initial solution, respectively, and M2 and V2 are the concentration and volume of the final solution, respectively.

In this case, we plug our known values into the formula:

M1 = 0.1 M (initial concentration)

V1 = 0.1 L (initial volume)

V2 = 0.5 L (final volume)

We want to solve for M2, the final concentration.

Substituting in:

0.1 M * 0.1 L = M2 * 0.5 L

We isolate M2 by dividing both sides of the equation by 0.5 L:

M2 = (0.1 M * 0.1 L) / 0.5 L = 0.02 M

Therefore, the final concentration of the solution is 0.02 M.

Answer:

After 28 sec 7.5 grams of Be will be left

Explanation:

Given data:

Total amount of Be = 30 g

Half life of Be = 14 sec

Mass left after 28 sec = ?

Solution:

First of all we will calculate the number of half lives in 28 sec.

Number of half lives = T elapsed / half life

Number of half lives = 28 sec / 14 sec

Number of half lives = 2

AT time zero = 30 g

At first half life = 30 g/2 = 15 g

At second half life = 15 g/ 2 = 7.5 g

So after 28 sec 7.5 grams of Be will be left.

Answer:

Explanation:

Sodium chromate has the chemical formula Na2CrO4, and a molar mass of 161.97 g/mol. It is a salt made of two sodium cations (Na+) and the chromate anion (CrO4-) in which the chromium atom is attached to four oxygen atoms.

Answer:

electrons

Explanation:

metals do what is called metallic bond

An electron is the particles are free to drift in metals.

The elements having tendency to lose electron and having properties like lustrous, malleable, ductile, opaque, denser and good conductor of heat and electricity is called metals

To learn more about drift in metals here.

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I believe it would be the last one. It just amplified the acid, which is (2. Al)(2.Cl3)-> Al2Cl6

Hope it helps!

A neutralization reaction, such as between hydrochloric acid and sodium hydroxide, is not considered a Lewis acid-base reaction as it does not involve the transfer of electron pairs.

A Lewis acid-base reaction refers to a reaction involving the transfer of an electron pair. The Lewis acid accepts the electron pair, while the Lewis base donates it. An example that does not fit the definition of a Lewis acid-base reaction would be the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), which produces water (H2O) and salt (NaCl). This reaction does not involve the transfer of electron pairs, and hence, is not a Lewis acid-base reaction.

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Answer:

The number of electrons in the outer energy level of oxygen is 6.

Explanation:

Oxygen is present in the group 16 of the periodic table. The electronic configuration of group 16 element is [tex]ns^{2}np^{4}[/tex]. The number of electrons in outer energy level of group 16 element is always found to be 6.

The addition of the number of the electrons present in the valence shell orbitals of oxygen will give the total number of electrons present in the outer energy level.

The number of electron in the outer energy level of oxygen is (2 + 4) = 6.

[A] + [B] ⇌ [C] + [D]

MnS ⇌ Mg + S

Ksp = [C][D]

Ksp = (Mn)(S)

2.3*10^-13 = (x)(x)

2.3*10^-13 = x^2

x = 4.8*10^-7

Concentration of sulfide is x.

Today, my son asked "Can I have a book, Mark?" and I burst into tears. 11 years old and he still doesn't know my name is Brian.

Answer:

The final temperature of the water mixture is 47.85°C

Explanation :

Given,

For Warm Water

mass = 10grams

Temperature = 105°C

For Cold Water

mass = 25grams

Temperature = 25°C

When a sample of warm water is mixed with a sample of cool water,

The energy amount going out of the warm water is equal to the energy amount going into the cool water. This means:

However,

Q = (mass) (ΔT) (Cp)

Cp = Specific heat of water = 4.184 J/Kg°C

So,

(mass) (ΔT) (Cp) = (mass) (ΔT) (Cp)

We start by calling the final, ending temperature 'x.' Keep in mind that BOTH water samples will wind up at the temperature we are calling 'x.' Also, make sure you understand that the 'x' we are using is FINAL temperature. This is what we are solving for.  

The warmer water goes down from to 105°C to x, so this means its Δt equals 105°C − x. The colder water goes up in temperature, so its Δt equals x − 25℃

Substituting the values,

(10)( 105°C − x)(4.184) = (25)(x − 25℃)(4.184)

Solving for x, we get

x = 47.85°C

Therefore, The final temperature of the water mixture is 47.85°C.

Answer:

The volume is 1143,78 L

Explanation:

We use the formula PV=nRT. The conditions STP are 1 atm of pressure and 273K of temperature. We calculate the weight of 1 mol of CH4.

Weight 1 mol CH4= weight C+ (weight H)x4= 12 g + 1 g x4= 16 g/mol

16 g----1 mol CH4

817,5g--x=(817,5gx1 mol CH4)/16g= 51, 1 mol CH4

PV=nRT V=(nRT)/P  

V= (51,1 mol x 0,082 l atm/K mol x 273 K)/1 atm

V= 1143,78 liters

Answer:

0.635 grams

Explanation:  

Equation for the reaction

[tex]Cu + 2 AgNO_3 -----> Ag^{2+} + CuNO_3[/tex]

mass of Cu = 5.00 g

molar mass = 63.5 g/mol

number of moles = [tex]\frac{mass}{molar mss}[/tex]

number of moles of Cu = [tex]\frac{5.00g}{63.5g/mol}[/tex]

number of moles of Cu = 0.0787 moles

To determine the moles of Ag formed; we have:

0.00588 moles of AgNO₃ × [tex]\frac{2 moles of Ag}{2 moles of AgNO_3}[/tex]

= 0.00588 moles of Ag are  produced

Molar mass of Ag = 108 g/mol

Then mass of Ag that will be produced = number of moles of Ag × molar mass of Ag

= 0.00588 moles × 108 g/mol

= 0.635 grams of Ag are produced.

Answer:

0.635 g of Ag

Explanation:

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To find the total heat absorbed by 65.0 grams of water when its temperature increases from 25°C to 40°C, use the formula: Q = mcΔT.

The total number of Joules of heat absorbed by 65.0 grams of water can be calculated using the formula:
Q = mcΔT, where m is the mass of water, c is the specific heat capacity of water, and ΔT is the temperature change.
In this case, you can use the specific heat capacity of water (4.184 J/g°C) to find the heat absorbed.

Water's chemical properties remain the same as it changes states from vapor to liquid to ice because it retains its molecular structure of two hydrogen atoms bonded to an oxygen atom (H₂O) throughout the transformations.

As water changes states from water vapor to liquid water, and then to ice, what remains consistent is (A) its chemical properties. This is because, in each state, water is still composed of Hydrogen and Oxygen atoms in a 2:1 ratio, represented as H₂O. Even though its physical properties like density, temperature, and appearance change, the fundamental molecular structure remains the same.

For instance, consider liquid water freezing into ice. Though the physical arrangement of the water molecules changes (which accounts for ice's unique property of being less dense than the liquid water), the water molecules themselves remain unchanged. Each water molecule is still composed of two hydrogen atoms bonded to an oxygen atom.

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Answer:

Modern scientists base their classifications mainly on molecular similarities. They group together organisms that have similar proteins and DNA. Molecular similarities show that organisms are related. In other words, they are descendants of a common ancestor in the past.

Explanation:

Answer:

3. I don’t have a chart, but this is the

most salt per volume. It is all I have.

Explanation:

Answer:

b

Explanation:

hi from 2022

Ben and Sam were conducting experiments on physical and chemical changes in science class. Sam is correct. It is a chemical change and the contents should be in D. for compound. Therefore, option B is correct.

In a physical change the visual aspect or form of the matter changes but the kind of matter in the substance does not. However, in a chemical change, the kind of matter changes and at least one new matter with new properties is produced.

Some of the processes that makes physical changes include cutting, bending, dissolving, freezing, boiling, and melting.

Examples of chemical changes are baking soda and vinegar creating carbon dioxide, iron rusting, and wood burning.

Thus, Sam is correct. It is a chemical change and the contents should be in D. for compound, option B is correct.

To learn more about the chemical and physical change, follow the link;

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Answer:

IT BREAKS AT RANDOM PLACES!!!!

An amorphous soild breaks at the random places

Amorphous solid, any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.

These solids are stabilized by the regular pattern of their atoms. Their characteristic properties include distinct melting and boiling points, regular geometric shapes, and flat faces when cleaved or sheared.

Learn more about Amorphous Solid here

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Answer: really hard

Explanation: I wish I knew how to help you

Final answer:

An acid is a compound that releases hydrogen ions in water. Strong acids fully ionize, releasing all their hydrogen ions, whereas weak acids only partially ionize. Examples are hydrochloric acid (strong) and acetic acid (weak).

Explanation:

Definitions of Acids, Strong Acids, and Weak Acids:

Acids can be described as molecular compounds that release hydrogen ions (H+) when dissolved in water, which are responsible for the characteristic properties of acids in aqueous solutions. These properties include the ability of the solution to conduct electricity, due to the presence of ions.

Strong acids are those that completely ionize in solution, releasing all of their hydrogen ions into the water. An example of a strong acid is hydrochloric acid (HCl), which dissociates into hydrogen and chloride ions as follows:

HCl → H+ + Cl¯

On the other hand, weak acids only partially ionize in water, which means not all of their hydrogen ions are released into the solution. Acetic acid, found in vinegar, is a common example of a weak acid. Its ionization is represented by the following chemical equation:

CH3COOH → CH3COO¯ + H+

The strength of an acid can be quantitatively represented by its acid ionization constant (Ka), which is higher for strong acids and lower for weak acids.

Answer:

B. Gas formation

Explanation:

When you combine baking soda and vinegar - which I'm assuming happened to create this reaction - it forms carbon dioxide, a gas.

The bubbling and fizzing in a science fair volcano is a result of gas formation due to the chemical reaction between baking soda and vinegar which produces carbon dioxide gas.

When a science fair volcano bubbles and fizzes, a chemical reaction takes place, specifically a gas formation. In a typical science fair volcano, baking soda (a base) and vinegar (an acid) are combined. This results in the formation of carbon dioxide gas which is what causes the 'bubbling' and 'fizzing' effect. It's a common demonstration of how some chemical reactions result in the production of gas. The gas then escapes the liquid in the form of bubbles causing the eruption we see.

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Answer: D is wrong

Explanation: The charges go from positive in the left to negative to the right.

Answer:

Celiac disease occurs in the intestines as an allergic response to Gluten in certain cereal grains.

Explanation:

Answer:

Celiac disease is genetic and if one person of the family has it you might have it too. Also if one of the parents have a certain gene and is passed on to the child the risk of celiac disease is high.

Explanation:

Hope it Helps

0.16 moles of Aluminum hydroxide are needed to react with 25 grams of sulfuric acid.

Explanation:

In order to find the number of moles we first need to write down the balanced equation as,

[tex]3 H_{2} S O_{4}+2 A l(O H)_{3} \stackrel{\text { yiek }}{\longrightarrow} \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}+6 \mathrm{H}_{2} \mathrm{O}[/tex]

Now as mentioned above,For 3 moles of sulfuric acid , we need 2 moles of Aluminum hydroxide to balance the equation,

Thus we can balance it as,

[tex]\begin{aligned}25 \mathrm{g} \text { of } \mathrm{H}_{2} \mathrm{SO}_{4} & \times \frac{1 \mathrm{mol} \text { of } \mathrm{H}_{2} \mathrm{SO}_{4}}{98.079 \frac{\mathrm{g}}{\mathrm{mol}}} \times \frac{2 \mathrm{mol} \mathrm{Al}(\mathrm{OH})_{3}}{3 \mathrm{mol} \mathrm{H}_{2} \mathrm{SO}_{4}} \\\\&=0.16 \mathrm{mol} \mathrm{Al}(\mathrm{OH})_{3}\end{aligned}[/tex]

Thus it is now clearly known that 0.16 moles of Aluminum hydroxide are needed to react with 25 grams of sulfuric acid.

Final answer:

The CaO bond in CaO is ionic, the CC bond in C13CCC13 is nonpolar covalent, the CCl bond in C13CCC13 is polar covalent, and the SeCl bond in SeCl2 is polar covalent.

Explanation:

The classification of bonds as ionic, polar covalent, or nonpolar covalent is based on the electronegativity difference between the bonded atoms. The greater the electronegativity difference, the more ionic the bond is.

(a) The CaO bond in CaO is an ionic bond. Calcium (Ca) is a metal and has a low electronegativity, while oxygen (O) is a nonmetal with a high electronegativity. The difference in electronegativity is large, resulting in an ionic bond.

(b) The CC bond in C13CCC13 is a nonpolar covalent bond. Both carbon (C) atoms have the same electronegativity, resulting in a nonpolar bond.

(c) The CCl bond in C13CCC13 is a polar covalent bond. Chlorine (Cl) has a higher electronegativity than carbon (C), resulting in a polar bond.

(d) The SeCl bond in SeCl2 is a polar covalent bond. Selenium (Se) and chlorine (Cl) have different electronegativities, resulting in a polar bond.

Answer:

Because it is closer to earth than the other blue giant stars.

Explanation:

The sun is closer to earth than any other big star which means we see it bigger.