What’s two options are examples of chemical changes

The density of the object weighing 15.50 g  when placed inside the water having initial volume 12.5 mL and the final volume 16.0 mL is 4.42 g/mL.

Density is defined as the mass of a substance per unit of its volume. It is denoted by a Greek symbol ρ. Density is the mass of a substance divided by its volume. It is given by -

                                              ρ = m

                                                      v

where,

ρ = density

m = mass

v = volume

Given data :

Mass (m) = 15.50 g

Volume (v) = (Final volume - initial volume)

               v = 16.0 mL - 12.5 mL = 3.5 mL

Putting the values in above formula,

Density = mass  

                volume

Density = 15.50 = 4.42 g/mL

                  3.5

The density of object is found to be 4.42 g/mL

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2.01214904 × 10²² silver atoms are there in 3.74 g of silver

The most common isotope of silver has 60 neutrons, 47 protons, and 47 electrons. Silver is a soft metal with a glossy metallic luster under normal circumstances. It is exceedingly malleable and ductile (can be formed into a wire).

The molar mass of silver is as follows:

Molar mass of Ag = 107.8682 g/mol

The number of atoms in a molar mass is Avogadro’s number:

6.022140857 × 10²³

Therefore 3.8 g of silver contains 3.8 times 6.022140857 × 10²³ divided by 107.8682 that equals 0.03522818 times

6.022140857 × 10²³

= 2.01214904 × 10²² atoms.

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Using simple multiplication, we can conclude that 1.5 is the numerical value of 1.2 × 1.222.

When solving mathematical analysis issues, numerical analysis is the study of methods that employ numerical approximation rather than symbolic manipulation (as distinguished from discrete mathematics). The study of numerical techniques aims to identify approximate rather than precise answers to issues.

Numerous engineering and physical science disciplines, as well as the life and social sciences, as well as commerce, the arts, and even medicine, use numerical analysis.

The use of more complex numerical analysis is now possible thanks to the rise in computing power, which also enables the creation of intricate and accurate mathematical models for use in engineering and science. Ordinary differential equations, which are used in celestial mechanics to forecast the motion of planets, stars, and galaxies, are examples of numerical analysis.

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1. Suppose 10 atoms of carbon (C) tear with 20 atoms of (O)….

B. 30

2. Which procedure could be used to demonstrate that matter is conserved during a chemical reaction?

B. Find the mass of an acid and a base. Combine them to produce water and salt. Find the mass of the water and salt.

3. What is always true according to the law of conservation of matter?

A. Atoms can be rearranged during a chemical reaction but cannot be added or taken away.

4. A student combines 2 liquids in a beaker…

B. The reaction produced a Gas that escaped the beaker

The actual yield of iron in moles is 0.2 mole and theoretical yield of iron is 0.8 mole. The percent yield of iron is 25%.

Yield can be defined as a measure of chemical reactions efficiency, as a ratio of mole of product to the mole of reactant.

Percent yield can be calculated as actual yield divided by theoretical yield, multiply by 100.

Molar mass of Fe is 55.84 g/moles

To calculate actual yield = mass/ molar mass

                                         = 11.4/55.84 = 0.2 moles

Theoretical yield = 0.395 x 2 = 0.8 moles

Percent yield % = actual yield/theoretical yield x 100%

                           = 0.2/0.8x100%

                           =  25%

Thus, the actual yield of iron in moles is 0.2 mole and theoretical yield of iron is 0.8 mole. The percent yield of iron is 25%.

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Answer:

c Thomson's cathode ray tube experiment

The volume of nonadecane that has a density of 0.7860 g/mL is 1573.2mL.

The volume of a substance can be calculated by dividing the mass of the substance by its density. That is;

Volume = mass ÷ density

According to this question, nonadecane has a density of 0.7860 g/mL and has 4.605 moles.

First we calculate the mass of nonadecane as follows:

mass = 4.605 mol × 268.518 g/mol

mass = 1236.53g

Volume = 1236.53g ÷ 0.7860 g/mL = 1573.2mL

Therefore, the volume of nonadecane that has a density of 0.7860 g/mL is 1573.2mL.

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Answer:

neutrons = 71

protons = 6

electrons = 6

Explanation:

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The percent by mass of Ca in CaCl2 is 36 percent

mass of Ca = 40 gram

mass of CaCl2 = 35.5 x 2 = 111 gram

percent by mass of element = molar mass of element/mass of compound x 100

percent mass of Ca = 40/111 = 36 percent

The concentration of an element in a compound or component in a mixture can be expressed, for example, as a mass percentage. The mass of a component is divided by the entire mass of the combination, then multiplied by 100%, to compute the mass percentage. Other Names: mass percent, (w/w)%

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The solubility of the compound is obtained as 9.5 * 10^-14 M.

The solubility product refers to the equilibrium constant that shows the extent to which a thing is soluble in water, Now we can write the solubility product as;

Ksp = [Hg^2+] [2OH^-]^2

Let  [Hg^2+]  =  [OH^-] = x

Then I can write;

Ksp = x * (2x)^2

Ksp = 4x^3

When x = solubility

x = ∛Ksp/4

Ksp =  3.60×10^−26

x =  ∛ 3.60×10^−26/4

x = 9.5 * 10^-14 M

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The products of the reaction between acetate ion and hydronium ion are acetic acid and water.The equilibrium lies to the left side of the reaction.

The equilibrium lies to the left side of the reaction as when the concentration of acetate or hydronium ion is increased the reversible reaction is favored leading to the formation of acetic acid  and water.

Factors affecting equilibrium direction are as follows:

1)Change in concentration:When the concentration of any component is altered,equilibrium direction changes to minimize the effect of concentration change.

When the concentration of reactants is increased, reaction proceeds in forward direction and when concentration of products is increased, reaction proceeds in backward direction.

2)Change in temperature:Increase in temperature causes equilibrium to move in direction of endothermic reaction while decrease in temperature  causes equilibrium to move in direction of exothermic reactions.

3)Change in pressure:An increase in pressure causes the reaction to reverse as the number of mole's of gas on reactant's side is decreased.

A decrease in pressure causes the reaction to move forward as the number of moles of gas on product side is reduced.

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5.95 x 10^-3 = 0.006

7.33 x 10^4 = 73,300

4.09 x 10^3 = 4090

9.15 x 10^-5 = 0.000

To calculate the significant figure for a given mathematical expression means to represent the end value to specific number of digits that are accurate.

The given figures are in scientific or exponential notation but to convert them to 3 significant figures the following steps are taken:

Therefore three significant figures of the expressions given include the following:

5.95 x 10^-3 = 0.006

7.33 x 10^4 = 73,300

4.09 x 10^3 = 4090

9.15 x 10^-5 = 0.000

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Answer:

Isomer

1.

CHEMISTRY DEFINITION

each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.

2.

PHYSICS DEFINITION

each of two or more atomic nuclei that have the same atomic number and the same mass number but different energy states.

Explanation:

Brainliest pls thank you have a good day bye bye

Answer:

each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.

Explanation:

The phrase which best describes electronegativity is the relative strength with which an element attracts electrons in a chemical bond and is denoted as option A.

This is referred to as the chemical property which is possessed by an element that involves its tendency to attract electrons especially during chemical bond formation.

Electronegativity increases from bottom to top in groups, and increases from left to right across periods in the periodic table and are influenced by factors such as number of valence electrons etc.

This is usually done so that they can achieve a stable octet configuration which results in the bonds being formed and the new substance being produced thereby making it important in a chemical reaction.

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The options are:

The molarity of the solution is 0.023 M and the molality of the solution is  17.9 m.

The concentration of a solution is defined as the amount of substance in a solution. Now we are told that we have a solution of  2.64 L aqueous solution of KOH. The solution has a density of 1.29 g/mL.

Density of the solution = 1.29 g/mL

Volume of the solution =  2.64 L

mass of the solution = 1.29 g/mL * 2.64 L = 3.4 g

Number of moles of the solute =  3.4 g/56 g/mol = 0.061 moles

Molarity =  0.061 moles/2.64 L = 0.023 M

Molality of the solution = 0.061 moles/3.4 * 10^-3 Kg = 17.9 m

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This nuclear reaction would give Boron - 14 as the product.

A beta emission has to do with the transformation of a proton to electron. This occurs with the change in the atomic number of the element. In this case, the parent nucleus that undergoes decay is carbon - 14.

The daughters nucleus will have the same mass number but a different atomic number. Let us now see the product of this reaction.

From the equation shown, this nuclear reaction would give Boron - 14 as the product.

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Answer:

Stereochemistry is of critical importance to drug action because the shape of a drug molecule is an important factor in determining how it interacts with the various biological molecules (enzymes, receptors, etc.) that it encounters in the body.

The boiling point of water in Zunzol is 59.9∘Z.

A thermometer must have two fixed points, the upper fixed points and the lower fixed point. The upper fixed point corresponds to the boiling point while the lower fixed point corresponds to the melting point.

Having that;

x - 0/100 = 0 - (-117.3)/78.4 - (-117.3)

x/100 = 117.3/195.7

195.7x = 117.3 * 100

x = 117.3 * 100/195.7

x = 59.9∘Z

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The final water reading in the graduated cylinder if the density of copper is 8.96 g/mL is 16.79mL

Density is defined as mass per unit volume. Density and volume have a directly proportional relationship. That is, any change in volume causes a change in density and vice versa.

Find the final water reading in the graduated cylinder

[tex]D=\frac{M}{V}[/tex]

where,

D= density

M= mass

V= volume

volume due to copper pieces

V= M/D

V=12.91g/8.96

 =1.440

find volume = original volume + displaced volume

                    = 15.35 + 1.440

                    = 16.79mL

The final water reading in the graduated cylinder if the density of copper is 8.96 g/mL is 16.79mL

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Answer:    es no metales

Explanation:

The volume of a metal with mass of 24.6 g and a density of 4.0 g/mL is 6.15mL.

The density of a substance is a measure of the mass of matter contained by a unit volume. It is measured in grams/litres.

The density can be calculated by dividing the mass by its volume as follows:

Density = mass ÷ volume

According to this question, a metal has a mass of 24.6 g and a density of 4.0 g/mL. The volume can be calculated as follows:

Volume = 24.6g ÷ 4g/mL

Volume = 6.15mL

Therefore, the volume of a metal with mass of 24.6 g and a density of 4.0 g/mL is 6.15mL.

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1) The mass of the object is 18 g

2) The correct relationship is option C

Density is the ratio of the mass to the volume of a body. We know that the density of the body is an intrinsic property. This implies that it does not change with the amount of substance or with the mass of the body. Let us now try to solve each of the problems.

1) Density = mass/volume

Volume = 1 cm * 3 m * 2 cm = 6 cm^3

Density of the body = 3 g/cm^3

Mass of the body = 6 cm^3 * 3 g/cm^3 = 18 g

2) To answer question 2, we have to remind ourselves of what we said that the density is the ratio of the mass to the volume of a body and that the density of a body is constant. This implies that the relationship that defines the relationship of the mass to the density of the material does not change and this is shown by option C.

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Answer:

compost at home it can reduce the amount of food you throw in the trash

Explanation:

can make a greater envoirment and is very eco friendly

Answer:

Second option

Explanation:

2 hour 30 minute it take to deliver all of the solution

Normal saline is a cornerstone of intravenous solutions commonly used in the clinical setting IV saline to replenish lost fluids, flush wounds, deliver medications, and sustain patients through surgery, dialysis, and chemotherapy and saline IV have even found a place outside the hospital, as a trendy hangover remedy

Here given data is IV saline solution deliver = 2.00 L and drop factor = 60.0 gtt/mL and drip rate = 115.0 gtt/min.

We have to calculate hours = ?

So for calculating hours

Time = volume × drip rate

Time = 2.00 L ×  115.0 gtt/min

Time = 230 means 2hours 30 minute

2 hours 30 minute will it take to deliver all of the solution

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Answer:

I think It's the 2nd "There are two compounds present"

The mass (in dg) of the 24.5 mL of the substance having a specific gravity of 0.841 is 206.045 dg

We'll begin by obtaining the density of substance. This can be obtained as follow:

Density of substance = Specific gravity × density of water

Density of substance = 0.841 × 1

Density of substance = 0.841 g/mL

The mass of the substance can be obtained as illustrated below:

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of substance = 0.841 × 24.5

Mass of substance = 20.6045 g

Multiply by 10 to express in dg

Mass of substance = 20.6045 × 10

Mass of substance = 206.045 dg

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