A student places a sample of a pure metal in a crucible and heats it strongly in air. Data from the experiment are given in the table above. The final mass was determined after the sample was cooled to room temperature. Which of the following statements related to the experiment is correct? (See attached table)
a.) The mass of the sample decreased, so physical changes occurred as the metal first melted and then boiled out of the crucible.
b.) The mass of the sample increased, so a chemical change occurred when bonds formed between the metal and another substance.
c.) There was nothing for the metal to react with, so only a physical change could have occurred.
d.) The sample was only heated, so neither a physical nor a chemical change occurred.

Newton's law of motion that act upon the vehicles at the point of impact is the second law of motion.

Newton's second law of motion states that the force applied to an object is directly proportional to the rate of change of momentum that is produced. Mathematically, we have;

F = m·v - m·u/Δt

Where;

m = The mass of the object

v = The final velocity of the object

u = The initial velocity of the object

Δt = The duration of motion of the object during change in velocity

Therefore, given that the mass, 'M', of the truck is larger than the mass, 'm', of the minivan, where the time of change in velocity Δt, and the initial and final velocities of both automobiles are the same such as in a sudden stop, the garbage ruck will exert more force than the minivan, and therefore, the garbage truck has a greater initial momentum before the automobiles are brought to a stop.

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Answer: False

Explanation:

Explanation:

decentralized multinational corporations, centralised global corporations, international companies, and transnational enterprises.

The student collected data on the mass of each artificial cell. The student predicted that the cell in the beaker with 25% sugar solution would have the greatest change in mass after 24 hours. The student's prediction would be correct.

The artificial cell placed in the beaker with 25% sugar solution would likely have the greatest change in mass after 24 hours because of osmosis.

Osmosis is the movement of water across a semi-permeable membrane from an area of high water concentration to an area of low water concentration. In this case, the artificial cell has a semi-permeable membrane that allows water to pass through, but not sugar.

The 25% sugar solution in the beaker is less concentrated than the sugar solution inside the artificial cell, so water will move from the beaker into the cell, causing the cell to swell and increase in mass.

On the other hand, the artificial cells in the beakers with 0% and 12.5% sugar solutions will have less of a change in mass as the solution outside of the cell is more concentrated than inside the cell.

Therefore, the correct answer is as given above

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Statement about isomers which is true is that isomers have the same chemical formula, but different structures.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer: 93.8

Explanation: hope you have Wonderful grades!!

Be is the second element with two valence elements When a core electron is eliminated, the energy of ionization increases. From an element's electrical configuration, it is simple to see a significant change in ionization energy.

Electronically, beryllium is configured as 1s2 2s2. The outermost shell of beryllium has two valence electrons, hence the data on ionization energy will show a sharp rise or leap from the second to the third ionization energy due to the elimination of a core electron. Nitrogen has the following electrical configuration: 1s2 2s2 2p3. The outermost shell of nitrogen has five valence electrons, thus when one of them is removed, the ionization energy data for nitrogen will show a sharp rise or leap from the fifth to sixth ionization energy.

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Most chlorine atoms contain 18 neutrons as mole ratio of chlorine-35 and chlorine-37 is more than 1.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

let the moles of chlorine-35 is n1 and chlorine-37 is n2

now we will use the formula of average atomic mass

M=n₁M₁+n₂M₂/n₁+n₂

let say, n₁/n₂=x

substitution gives,35.45=x(35)+37/x+1 which on solving gives x=3.44

since mole ratio is more than 1, that's why most chlorine atoms have 18 neutrons.

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Answer:

[tex]\small\mathfrak\green{calcium \: carbonate} \\ \\ \small\mathfrak\red{hope \: it \: helps...}[/tex]

the chemical equation will be XY2

Option (4) is correct. The rate constant of a second order reaction has the unit  L/mole. sec.

In the Second order reaction the rate is proportional to the square of the concentration of one reactant. Rate of Second order reaction  is proportional to the product of the concentrations of two reactants. Such reactions generally have the form,

A + B → products.

Each monomer combines to form a larger molecule is called dimer. For the units of the reaction rate to be moles per liter per second (M/s), the units of a second-order rate constant must be the inverse (M−1·s−1). Because the units of molarity are expressed as mole/L, the unit of the rate constant can also be written as L(mole ·s).

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Answer:

the number of protons and neutrons at both terminals are equal

Explanation:

When the number of positive charge and negative charge are both equally the terminal, it becomes neutral and out of charge, because first it undergo enough chemical reaction and there is no remaining tendency for positive and negative charges to get separated. When this tendency dies, the battery also will run out of charge.

Answer:

yes they are same thing by E=MC^2 EINSTEIN'S EQUATION

Answer:

True.

Explanation:

The mass of these three particles is less than the mass of a neutron, so they each get some energy as well. So energy and matter are really the same thing. Completely interchangeable. And finally, Although energy and mass are related through special relativity, mass and space are related through general relativity.

So energy and matter are really the same thing. Completely interchangeable. And finally, Although energy and mass are related through special relativity, mass and space are related through general relativity. ... So in a way, energy, matter, space and time are all aspects of the same thing.

Answer & Explenation:

2H2 + O2 -> 2H20 is the balanced equation for the reaction of Hydrogen with Oxygen to form water so

If you have 32g of O2 this is a simple Dimensional analysis problem

32g O2 x 36.03056g H20/31.9988g O2 this way the O2 cancels out and you are left with just the H2O so your raw answer would be 36.0319112, then if your instructor requires a significant figure answer that would be to 2 significant figures the information you were given 32g O2, so as above 36g or Water are produced. Just a different way to view and solve the problem with the balanced equation so you can see the way everything relates to everything else. the molar masses of O2 and H2O are simply found my adding up 2 Oxygens 15.9994g x2 = 31.9988g and H2O = 2(1.00794) + 15.9994 = 18.01258 but you then have to multiply that by 2 because the reaction states you get 2 mols in the reaction so that is where I came up with the 36.03056g for the solution. Hope this helps. Dimensional Analysis is and can be one of the best ways to solve these problems, because not always are you going to be dealing with 1:2 ratios.

the partial pressure of gas A in the total volume is 3.57 bar, and the partial pressure of gas B in the total volume is 0.70 bar.

When the gases are allowed to mix together, the total pressure of the mixture is equal to the sum of the partial pressures of each gas. The partial pressure of each gas is equal to the product of the total pressure and the mole fraction of that gas. To find the mole fraction of each gas, we first need to find the number of moles of each gas. The number of moles of gas in container A is given by PV/RT where P is the pressure, V is the volume, R is the ideal gas constant and T is the temperature.

n_A = (2.90 bar * 747 mL) / (8.314 J/molK * (273.15 + 23)) = 0.0295 mol

The number of moles of gas in container B is given by PV/RT

n_B = (4.30 bar * 119 mL) / (8.314 J/molK * (273.15 + 23)) = 0.0045 mol

The total number of moles of gas in the mixture is the sum of the number of moles of gas in container A and container B.

n_total = n_A + n_B = 0.0295 mol + 0.0045 mol = 0.0340 mol

The mole fraction of gas A in the mixture is the number of moles of gas A divided by the total number of moles of gas.

x_A = n_A / n_total = 0.0295 mol / 0.0340 mol = 0.8735

The mole fraction of gas B is

x_B = n_B / n_total = 0.0045 mol / 0.0340 mol = 0.1324

The partial pressure of gas A is equal to the total pressure multiplied by the mole fraction of gas A.

P_A = (0.8735) * (2.90 bar + 4.30 bar) = 3.57 bar. The partial pressure of gas B is equal to the total pressure multiplied by the mole fraction of gas B. P_B = (0.1324) * (2.90 bar + 4.30 bar) = 0.70 bar

So the partial pressure of gas A in the total volume is 3.57 bar, and the partial pressure of gas B in the total volume is 0.70 bar.

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Answer:

89-91=1 the answer is 1molar mass

Answer:

Answer Below

Explanation:

Answer: 8.4322×1024atoms atoms are in 1.4 moles of cadmium. Cadmium is present in some foods and is emitted when fossil fuels like as coal and oil is used, smoking cigarettes.

Answer:

The answer is 8.4308 × 10²³ atoms

Explanation:

Multiply by Avogadro's number (Nₐ)

Nₐ = 6.022 × 10²³ mol⁻¹

Now,

1.4 × 6.022 × 10²³ = 8.4308 × 10²³

Thus, 8.4308 × 10²³ atoms are in 1.4 moles of Cadmium.

The coefficient of ammonia in the above chemical equation is 3.

A chemical equation is said to be balanced when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.

Balancing chemical equations involves the addition of stoichiometric coefficients to the reactants and products.

According to this question, ammonia reacts with oxygen gas to produce nitrogen oxide and water as follows:

4NH₃ + 50₂ → 4NO + 6H₂O

Based on the above balanced equation, it can be said that the coefficient of ammonia is 4.

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The unit of f''(a) is milliliters/minute^2

The function t=f(a) models the time, in minutes, for a chemical reaction to occur as a function of the amount a of catalyst used, measured in milliliters.

So, here double differentiation is to be done.

t=f(a)

differentiating with respect to t,

d(t)/dt = d(f'(a))/dt

or, d(f'(a))/dt = 1

again differentiating with respect to t,

d [d(f'(a))/dt]/dt = d(1)/dt = 0 ...1

or, f''(a) = 0

so, here if we put 'unit expression' in Left hand side of 1

it is d [d(f'(a))/dt]/dt  i.e.  mililiters/miniute/minute [as given t is measured in minute and f(a) is measured in ml)

or, ml/minute^2

so as we are performing double differentiation, the unit of f''(a) is milliliters/minute^2

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Answer:

Francium

Hope this helps :)

100 cm is meter stick.

Centimeter is denoted by the (cm). It is a metric unit of the measurement which is used for measuring the length of an object.

Meterstick is a foldable ruler which is used to measure the length, and it is common in the construction industry. They are made up of wood or plastic and often they have a plastic or metal joints so that they can be folded together.  

A meter measuring stick, which is one meter (39.37 inches) long, it contains 100 centimeters. Thus, centimeter is equal to one-hundredth of a meter. The word centimeter comes from the late 18th-century. The word centimeter derived from the Latin root "centum"/ means "hundred" and the Greek root "metron", meaning "measure".

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Answer:

45 km

Explanation:

To find the distance Tylee walked, multiply her speed by the time.

[tex]d=10(4.5)[/tex]

[tex]d =45[/tex]

The distance Tylee walked is 45 kilometers.

I hope this helped :)

Tylee walked 45 km from her parents' farm into town .

Speed can be understood as the measure of  how fast an object is moving.

It is the rate at which an object covers certain distance in fixed amount of time.

It is scalar quantity and its S.I. unit is m/sec .

[tex]\rm Speed = \dfrac{distance}{time}[/tex]

It is given in the question speed = 10 km/h and time = 4.5 hr

So,

[tex]\rm Distance = Speed\; \times\;time[/tex]

[tex]\rm Distance = 10\; \times\;4.5\\\\\rm Distance = 45 \;km\\[/tex]

Therefore Tylee walked 45 km from her parents' farm into town .

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The pieces of information a chemical equation includes are:

A chemical equation is a graphical representation of a chemical process that employs symbols and chemical formulas. Reactant entities appear on the left, as well as product entities appear on the right, with a plus sign connecting the entities in both the reactants and the products and an arrow pointing towards the products to show the direction of the reaction.

Chemical formulae can be symbolic, structural (pictorial diagrams), or a combination of the two. The absolute values of the stoichiometric numbers are represented by the coefficients adjacent to the symbols and formulae of entities. Jean Beguin drew the very first chemical equation in 1615.

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Orbitals that are described by each of the combinations quantum numbers ; n = 3, ℓ =2 orbitals n = 4, ℓ = 2 is 5. ml=2 here is referring to last(5th) orbital space 4d.

In atomic theory and quantum mechanics, atomic orbital is a function describing the location and wave-like behavior of electron in an atom.

Quantum numbers  (n, l, ml, ms )

n=3, refers to 3rd energy level      

3rd energy level has 3 possible values of l  and d has 5 different orientations.

s=0   p=1    d=2

--> -2,-1,0,1,2

When; n=3 l=2, then number of orbitals is 5.

n=4 refers to 4th energy level ;        

4th level has 4 possible l values;      

s=0 p=1 d=2 f=3        

When, n=4   l=2 and  ml=2  

The number of orbitals is 5 and  ml=2 is referring to last(5th) orbital space 4d.

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Answer:

1. P

2. A/B

3. A/B

4. R/O

5. P

6. R/O

7. A/B

8. P

9. R/O

10. R/O

Explanation:

Precipitation:

Ag (aq) + HCl (aq) → H₂ (g) + AgCl↓

Precipitation reactions can contain a single element.

Certainly, two soluble solutions are mixed, forming an insoluble solid.

Reactions can be identified using a solubility chart, because solubility can affect the precipitacion's equilibrium.

Acid base:

Certainly you mix an acid(H+) an a base (OH-)

We talk about neutralization because we make water. And, there is also a formed salt.

HNO₃  +  KOH →  H₂O  + KNO₃

H⁺  +  OH⁻  ⇄  H₂O    Kw

Redox:

This is the reaction where moles of electrons are transferred and gained.

A pure element is consumed or formed. We have 2 half reactions:

- Reduction (oxidation state decreases, electrons are released)

- Oxidation (oxidation state increases, electrons are gaines)

Reactions involving pure O₂ are named combustion, which is a redox type.

This is an example of redox decomposition of hydrogen peroxyde.

2H⁺  +  H₂O₂  + 2e⁻  →  2H₂O

H₂O₂  →  2H⁺  +  O₂  + 2e⁻  

H₂O₂  →  2H₂O  +  O₂

A 7.5 10-3 M Ba(OH)2 solutions at 25°C has a pH of 1.82. (option b).

A homogenous solution of two or more ingredients with particles smaller than one nm is referred to as a solution. Solutions come in many forms, such as soda water, salt and sugar solutions, etc. In a solution, every element appears as a single phase.

In chemistry, a solution is a homogeneous mix of two or more molecules in relative proportions that can be constantly changed up to what is known as the limit of solubility. Although the term "solution" is frequently used to refer to the liquid state of matter, solutions of gases and solids are also possible.

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Answer:

no

Explanation:

After 4 minutes, 200 g of protactinium-234 would remain.

Protactinium-234 is a radioactive isotope of protactinium. It is a fission product that is produced when uranium atoms undergo fission. It has a half-life of 1.17 minutes and decays via beta-decay to uranium-234. It is the most stable isotope of protactinium and is found in very small quantities in uranium ore. The main uses for protactinium-234 are for research, nuclear medicine and nuclear power. In research, it can be used to study properties of fission products and to measure the efficiency of nuclear reactors. In nuclear medicine, it can be used to detect cancers and other conditions. Finally, it can be used in nuclear power plants to help regulate and control the flow of energy.

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Answer:

Synthesis-

3. Sodium (Na) reacts with chlorine (Cl) to give sodium chloride (NaCl).

6. On heating iron ore (Fe2O3) with carbon (C), we get iron (Fe) and carbon dioxide (CO2).

5. A strip of magnesium (Mg) burns brightly in oxygen (O2) to form a white powder, magnesium oxide (MgO).

Decomposition -

1. When a clam shell (CaCO3) is heated,carbon dioxide (CO2) is given off and a white powder, calcium oxide (CaO), forms.

2. 'Nitrogen pentoxide (N2O5) is an unstable gas that changes to nitrogen dioxide (NO2) and oxygen (O2) at room temperature.

Replacement -

4. Zinc (Zn) metal reacts with copper sulfate (Cu2SO4) to give zinc

sulfate (ZnSO4) and copper (Cu).

Explanation: