Victor put a match on a balance and found that its mass was 6.0 grams. Then he lit the match and put it out after a few seconds.



He put the partially burned match on the balance again. This time, its mass was 4.5 grams.

Which of the following best explains what happened as the match burned?
A.
Some of the matter changed from solid to gas and went into the air.
B.
The matter moved to a different part of the match.
C.
Some of the mass was destroyed by the fire.
D.
The mass of the match combined with the mass of the fire.

The reaction between nickel and hydrochloric acid can be written as follows:

Ni + 2HCl → NiCl2 + H2

In this equation, the nickel (Ni) reacts with the hydrochloric acid (HCl) to form nickel chloride (NiCl2) and hydrogen gas (H2).

The reaction is a classic example of a single displacement reaction, where the more reactive metal (nickel) replaces the less reactive hydrogen in the acid.

The balanced chemical equation shows that for every mole of nickel that reacts, two moles of hydrochloric acid are required. The reaction produces one mole of hydrogen gas and one mole of nickel chloride.

The reaction between nickel and hydrochloric acid is exothermic, meaning that it releases heat. This makes it useful for certain industrial applications, such as in the production of nickel chloride for use in the production of stainless steel and other alloys.

It is important to note that this reaction can be dangerous, as the production of hydrogen gas can lead to the formation of explosive mixtures if not properly controlled.

Additionally, hydrochloric acid is a strong acid and can cause severe burns if it comes into contact with the skin or eyes.

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Answer:

Explanation:

All periodic tables list different amounts of elemental masses. I'm going to round Sodium to 23

1 mol of sodium = 23

0.0467 mol sodium = x

Cross multiply

1*x = 0.0467 * 23

x = 1.0741 grams

Answer:

Explanation:

Answer : The new concentration will be, 0.0757 M

Solution :

According to the dilution law,

where,

= molarity of NaCl solution = 0.455 M

= volume of NaCl solution = 375 ml = 0.375 L

= new concentration = ?

= volume of new concentration after dilution with water = 0.375 + 1.88 = 2.255 L

Now put all the given values in the above law, we get the new concentration.

Therefore, the new concentration will be, 0.0757 M

Answer:

0.0757 M NaCl

Explanation:

To calculate the new concentration of the sodium chloride (NaCl) solution after dilution, we can use the dilution formula.

\(\boxed{\sf C_1V_1=C_2V_2}\)

where:

In this case, we have 375 mL of a 0.455 M sodium chloride solution which is diluted with 1.88 L (1880 mL) of water. The final volume of the solution after dilution is:

\(\sf V_2 = V_1 + V_{\sf water} = 375\;mL + 1880\; mL = 2255\; mL\)

Therefore:

Substitute these values into the formula and solve for C₂:

\(\implies \sf 0.455\;M \cdot 375\;mL=C_2 \cdot 2255\;mL\)

\(\implies \sf C_2=\dfrac{0.455\;M \cdot 375\;mL}{2255\;mL}\)

\(\implies \sf C_2=0.075665188...\; M\)

\(\implies \sf C_2=0.0757\; M\;(3\;s.f.)\)

Therefore, the new concentration of the sodium chloride solution after dilution is 0.0757 M, to three significant figures.

Answer:

6.022×1023 atoms

Explanation:

The neutral solutions formed when acids and bases combined in stoichiometrically equivalent amounts are option c and option d.

The following reactions forms a neutral solution:

c) HBr(aq) + KOH(aq) ⇌ KBr(aq) + H₂O(l)
d) HClO₄(aq) + LiOH(aq) ⇌ LiClO₄(aq) + H₂O(l)

The above reactions involve the combination of an acid and a base to form a salt and water. In these reactions, the acid and base react completely to form their respective salt and water, resulting in a neutral solution. These are reaction of strong acids, HBr and HClO₄ and; strong bases, KOH and LiOH, which results in formation of neutral salts.

The NH₃(aq) + HCl(aq) ⇌ NH₄Cl(aq) reaction involve the formation of an acid salt (NH₄Cl) respectively, and therefore, do not form a neutral solution.

HCN(aq) + KOH(aq) ⇌ KCN(aq) + H₂O reaction involve weak acid plus strong base producing alkaline salts.

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Answer:

Thus, the second principal energy level can hold up to eight electrons, two in the s orbital and six in the p orbital. The third principal energy level has one s orbital, three p orbitals, and five d orbitals, which can each hold up to 10 electrons. This allows for a maximum of 18 electrons.

Answer:

479 grams

Explanation:

5.43 times the molar mass of CaSO4 would give us the answer.

(5.43) * (40.078 + 32.066 + 15.9994) = 478.618662 grams

Significant figures is 3, meaning we need to round it into 3 places, giving us 479 grams.

Sample A, with an activity of 6,500 Bq, has a higher activity and therefore produces a greater amount of radiation compared to Sample B, which has an activity of 92.5 Bq.

Radioisotopes are radioactive elements with unstable nuclei that undergo radioactive decay to achieve stability. During this process, radioisotopes emit radiation. Radiation refers to the energy emitted by a radioactive source. The type of radiation emitted during decay includes alpha particles, beta particles, and gamma rays.

The measure of the radiation produced by a radioisotope is known as its activity, which is quantified in units of Becquerel (Bq) or Curie (Ci). One Bq represents one decay per second, while one Ci corresponds to 3.7 x 10^10 decays per second. Thus, 1 Ci equals 3.7 x 10^10 Bq.

For example, Sample A has an activity of 6.5 kBq, which is equivalent to 6,500 Bq since one kiloBecquerel (kBq) equals 1,000 Becquerel (Bq). On the other hand, Sample B has an activity of 2.5 μCi, which is equivalent to 92.5 Bq since one microCurie (μCi) equals 37,000 Bq.

Consequently, Sample A exhibits a higher activity level than Sample B. In other words, Sample A produces a greater amount of radiation compared to Sample B.

To summarize, radioisotopes undergo radioactive decay and emit radiation, which is measured by their activity in units of Becquerel or Curie. Sample A, with an activity of 6,500 Bq, has a higher activity and therefore produces a greater amount of radiation compared to Sample B, which has an activity of 92.5 Bq.

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Answer:

1.conical flask

2.beaker

3 graduated cylinder

4.receiver

5.distillation flask

Explanation:

the name of material is this!

The answer is e. Y (yttrium) has the smallest number of unpaired electrons in the ground state, with zero unpaired electrons.

Fe2 (iron) has four unpaired electrons, Pd4 (palladium) has two unpaired electrons, Cr3 (chromium) has three unpaired electrons, and Tc4 (technetium) has four unpaired electrons.

Based on the given options, element Y (yttrium) has the smallest number of unpaired electrons in its ground state.

Yttrium (Y) has an atomic number of 39, which corresponds to an electron configuration of [Kr] 5s² 4d¹. In this configuration, Y has only one unpaired electron. In comparison, the other options have more unpaired electrons in their ground states.

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The answer is e. Y (yttrium) has the smallest number of unpaired electrons in the ground state, with zero unpaired electrons.

Fe2 (iron) has four unpaired electrons, Pd4 (palladium) has two unpaired electrons, Cr3 (chromium) has three unpaired electrons, and Tc4 (technetium) has four unpaired electrons.

Based on the given options, element Y (yttrium) has the smallest number of unpaired electrons in its ground state.

Yttrium (Y) has an atomic number of 39, which corresponds to an electron configuration of [Kr] 5s² 4d¹. In this configuration, Y has only one unpaired electron. In comparison, the other options have more unpaired electrons in their ground states.

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Answer:

\(\sf\large\underline\purple{Fractional\: Distillation:-}\)

\(\rightarrow\)The process involves repeated distillations and condensations and the mixture is usually separated into component parts. The separation happens when the mixture is heated at a certain temperature where fractions of the mixture start to vaporize.

\(\rightarrow\)The basic principle of this type of distillation is that different liquids boil and evaporate at different temperatures. So when the mixture is heated, the substance with lower boiling point starts to boil first and convert into vapours.

\(\sf\underline\green{Applications\: Of\:Fractional\: Distillation:-}\)

________________________________

Hope it helps you:)

The terms with the proper definition is as follows -

a) Greenhouse gas products of denitrification

b) Annamox reaction product is - N2 gas

c) Oxidation of ammonium ion - Nitrification

d) Forms ammonium ion from N2 - Nitrogenase

option (a) Denitrification is the microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen, principally greenhouse gas products :- nitrous oxide (N2O) and nitrogen (N2). Denitrifying microorganisms involve a wide range of bacterial groups, such as Bacillus, pseudomonas etc.

option (b) Annamox is the anaerobic oxidation of ammonium with nitrite as the electron acceptor and dinitrogen gas (N2) as the product.

option (c) Nitrification is the oxidation of ammonium ion to nitrite ion and nitrite ions are oxidised to nitrate ions by receiving water.

option (d) Nitrogen fixation is the process by which gaseous nitrogen (N2) is converted to ammonium ion (NH4+) in the presence of an enzyme complex called nitrogenase that catalyses the reduction of N2 to NH3.

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The result obtained by converting 20 quibs of skvarnick to sleps, given that 5 quibs of skvarnick is equal to 3 sleps, is 12 sleps

We can convert quibs to sleps by using the following conversion scale:

5 quibs of skvarnick = 3 sleps

With the above conversion scale we can convert 20 quibs of skvarnick to sleps as illustrated below:

5 quibs of skvarnick = 3 sleps

Therefore,

20 quibs of skvarnick = (20 quibs × 3 sleps) / 5 quibs

20 quibs of skvarnick = 12 sleps

Thus, from the calculation made above, we can conclude that 20 quibs is equivalent to 12 sleps

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Answer:

D

Explanation:

7 is neutral on a PH scale. Anything less is an acid and anything higher is a base. A Ph scale goes from 1-13. 8.4-7=1.4. This is a small change so it is considered a weak base. Can I get brainliest?

Answer:

D.A weak base

Explanation:

The pH of a weak base falls somewhere between 7 and 10. Like weak acids, weak bases do not undergo complete dissociation; instead, their ionization is a two-way reaction with a definite equilibrium point. While strong bases release hydroxide ions via dissociation, weak bases generate hydroxide ions by reacting with water. Ammonia (NH3) and methylamine (CH3NH2) are examples of weak bases.

Plate tectonics is supported by the distribution of fossils. The graphic depicts how four distinct fossilised species were distributed over three continents.

How the plates originally fit together is shown by evidence from fossils, glaciers, and adjacent coasts. Plants and animals formerly lived there, and fossils show us when and where.

According to the idea of plate tectonics, the mantle is covered by a number of different plates that make up the Earth's crust. Compared to the mantle of the Earth, the plates behave like a solid, rigid shell. The lithosphere is this thick outer layer. Continental drift has been replaced by plate tectonics.

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The balanced net ionic equation for the reaction when aqueous NiCl₂ and aqueous Na₂S are mixed in solution to form solid NiS and aqueous nacl is:

NiCl₂(aq) + Na₂S(aq) → NiS(s) + NaCl(aq)

This reaction is classified as a double replacement reaction, in which the ions of two different compounds exchange places to form two new compounds. In this case, the chloride ions from the sodium chloride (NaCl) and the nickel chloride (NiCl₂) solutions swap places, resulting in the formation of solid nickel sulfide (NiS) and aqueous sodium chloride (NaCl).This double replacement reaction creates two new compounds by exchanging the ions of two different compounds. The formation of solid nickel sulfide (NiS) and aqueous sodium chloride is the result of the chloride ions from the sodium chloride (NaCl) and nickel chloride (NiCl2) solutions switching places (NaCl).

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The first civil war battle on Georgia soil was the Battle of Chickamauga, which took place on September 18-20, 1863.

What is Georgia soil?
Georgia soil is a type of soil found in the U.S. state of Georgia. It is mostly composed of loamy sand, silt, and clay, with a pH level of around 6.5. Georgia soil is predominantly neutral, meaning it is neither acidic nor alkaline. This type of soil is considered to be a prime agricultural soil due to its excellent drainage and water-holding capacity. The fertility of Georgia soil varies by region, with some areas having higher levels of organic matter and nutrient content than others. Georgia soil is also generally well-drained, making it an ideal medium for gardening, landscaping, and farming. Furthermore, Georgia soil is well-suited to growing a variety of plants, including vegetables, fruits, grains, and flowers.

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The amount of heat needed to increase the temperature of a metal's unit mass by one degree is known as its specific heat.

Thus, It is a measurement of the thermal energy storage capacity of the metal molecules at the molecular level and specific heat.

The atomic structure of the metal, its atomic weight, temperature, phase, and impurities are only a few of the variables that have an impact on this number and Specific heat.

Every metal has a different specific heat. It is possible for metals with the same elemental structure to have varying values. The atomic structure, mass, temperature, and presence of impurities in the metal, among other things, all have an impact on the specific heat value in specific heat.

Thus, The amount of heat needed to increase the temperature of a metal's unit mass by one degree is known as its specific heat.

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Answer:

Well its actually the movement of tectonic plates under the earths surface that when the slide along each other, pull away from each other, or push up against each other they create earth quakes.

Explanation: yes.

A substance's ability to be observed or measured without altering its identity is referred to as its physical property.  How successfully a substance can undergo a specific chemical transition is determined by its chemical characteristic.

A substance's ability to be observed or measured without altering its identity is referred to as its physical property. Physical characteristics might include things like color, density, hardness, melting, and boiling points, among other things. How successfully a substance can undergo a specific chemical transition is determined by its chemical characteristic.

Based on their physical and chemical properties, materials can be grouped. Matter is anything that has mass and space. It is possible to mix any solid, liquid, and gas. When a substance changes from one state of matter to another without changing its chemical composition, a physical transition takes place.

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Answer:

3

Explanation:

A nitrogen atom has 3 unpaired electrons

The result of the calculation is:

(a) 0.1858

(b) 0.000128

(c) 2.51

Significant figures are the digits in a measurement or calculation that provide meaningful information about the precision and accuracy of that measurement or calculation. In scientific notation, the first non-zero digit is the first significant figure and all other non-zero digits and zeros that are between significant figures are also considered significant.

The last significant figure in a number is often rounded to provide the desired level of precision. The rules for determining significant figures are used to ensure that the results of calculations are reported accurately and consistently.

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Answer:

Advantages:

1. Grouping of elements. He generalized the study of the elements then known to a study of mere 8 groups.

2. Gaps for undiscovered elements. Mendeleev left some gaps in his periodic table. These gaps were left for subsequent inclusion of elements not known at that time. He correctly thought that such elements would be discovered later.

3. Prediction of properties of undiscovered elements. He predicted the properties of then unknown elements om the basis of properties of elements lying adjacent to the vacant slots.

4. Incorrect masses corrected. He was able to correct the values of atomic mass of elements like gold and platinum by placing these elements strictly on the bases of similarities in their properties.

Disadvantages:

1. Anomalous pairs: Argon with atomic mass 39.9 precedes potassium with atomic mass 39.1.

Cobalt with atomic mass 58.9 precedes nickel with atomic mass 58.6.

Tellurium with atomic mass 127.6 precedes iodine with atomic mass 126.9.

2. Position of isotopes: According to Mendeleev's periodic law, isotopes of an element must be given separate places in the periodic table since they have different atomic masses. But they were not assigned separate places.

3.Grouping of chemically dissimilar elements: Elements such as copper and silver bear no resemblance to alkali metals but they have placed in separate groups.

4.Separation of chemically similar elements: Elements that are chemically similar, such as gold and platinum have been placed in separate groups.

5.Electron arrangement: It does not explain the electron arrangement of elements.

6. Position of Hydrogen: It was not given in a fixed position.Explanation:

The Mendeleev periodic table has strengths in its predictive power, organization of elements, and observation of periodic trends. However, it has weaknesses in incomplete representation, limited understanding of atomic structure, and challenges in placing rare earth elements.

The Mendeleev periodic table, developed by Dmitri Mendeleev in the 19th century, laid the foundation for the modern periodic table. It has several strengths and weaknesses, which are outlined below:

Strengths of the Mendeleev periodic table:

Predictive Power: One of the major strengths of the Mendeleev periodic table is its ability to predict the existence and properties of yet-to-be-discovered elements. Mendeleev left gaps in the periodic table, accurately predicting the properties of elements that were later discovered and filled in those positions.

Periodic Trends: The Mendeleev periodic table organizes elements in a way that allows for the observation of periodic trends. Elements within the same group (vertical column) exhibit similar chemical properties and have similar valence electron configurations. This periodicity helps in understanding the behavior and reactivity of elements.

Classification of Elements: The Mendeleev periodic table classifies elements based on their atomic number and chemical properties. It provides a systematic arrangement of elements, allowing scientists to organize and study them more efficiently.

Weaknesses of the Mendeleev periodic table:

Incomplete Representation: The Mendeleev periodic table, when initially proposed, had gaps for undiscovered elements. While Mendeleev made accurate predictions, some of the gaps were filled in later with elements that did not necessarily match the properties initially predicted. This incomplete representation can be seen as a weakness.

Limited Understanding of Atomic Structure: At the time of Mendeleev's development of the periodic table, the understanding of atomic structure was incomplete. The periodic table was based on elemental properties without the knowledge of atomic numbers or the electron configuration of elements. This limitation hindered the ability to explain certain observed trends and properties accurately.

Lack of Internal Structure: The Mendeleev periodic table did not provide a detailed understanding of the internal structure of atoms or the arrangement of electrons in energy levels. It primarily focused on organizing elements based on their chemical properties and atomic weights, lacking the underlying atomic structure information.

Rare Earth Element Placement: Mendeleev faced challenges in placing the rare earth elements in the periodic table. Initially, he grouped them together as a separate series, but later refinements led to the placement of the rare earth elements within the main body of the table. The difficulty in organizing these elements reflects a weakness in the early understanding of their properties and arrangement.

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Answer:pp

Explanation:

Taking into account the definition of percentage composition, the percent composition of carbon in this sample is 62.17%.

The Percentage Composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.

Then, the percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

\(percentageby mass= \frac{mass of solute}{mass of solution}x100\)

In this case, you know:

Replacing:

\(percentageby mass= \frac{46.63 g}{75 g}x100\)

Solving:

percentage by mass= 62.17 %

Finally, the percent composition of carbon in this sample is 62.17%.

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Answer:

5 hours.

Explanation:

Given that,

Initial time, \(T_i=6\ pm\)

Final time, \(T_f=11\ pm\)

We need to find how much time did it take the car to arrive.

Time =  final time-initial time

= 11 pm - 6 pm

= 5

So, it takes 5 hours by car to arrive.

Answer:

m&ms, cus you can tell they're different but they can also be separated. salad because you can pick pieces of it out and it's made from different things, chocolate chip cookies cus you can take the chocolate chips out (or oatmeal raisin cookies)