The reaction between zinc and hydrogen chloride produces zinc chloride, hydrogen gas, and heat. If more heat is removed from the reaction, how does the rate of reaction change to counter the action?

Answers

Answer 1
Final answer:

When more heat is removed from the reaction, the rate of reaction slows down to counteract the heat loss. This can be controlled by changing the temperature or using a catalyst.

Explanation:

When more heat is removed from the reaction between zinc and hydrogen chloride, the rate of the reaction slows down to counteract the heat loss. This is because the reaction is exothermic, meaning it releases heat as a product. By slowing down the reaction rate, less heat is produced, helping to maintain equilibrium in the system.

One way the rate of reaction can be controlled is by changing the temperature of the system. When heat is removed, the temperature decreases, which decreases the kinetic energy of the reactant molecules. As a result, the frequency of successful collisions between reactant molecules decreases, slowing down the overall rate of the reaction.

Another way the rate of reaction can be controlled is by using a catalyst. A catalyst is a substance that speeds up the rate of a reaction without being consumed in the process. By providing an alternative pathway for the reaction to occur, a catalyst can help overcome the activation energy barrier, allowing the reaction to proceed at a faster rate.


Related Questions

Consider these two statements regarding the equation PCl5(g) ⇌ PCl3 +Cl2 + heat: Statement 1: Adding heat to this reaction mixture would increase the reverse reaction. Statement 2: Cooling this reaction mixture would increase the forward reaction. A. Statements 1 and 2 are both true. B. Statement 1 is true, and statement 2 is false. C. Statements 1 and 2 are both false. D. Statement 1 is false, and statement 2 is true.

Answers

Answer:- A. statements 1 and 2 are both true.

Explanations:- As per Le Chatelier's principle, a reaction shifts to the direction where it could oppose the change made to it at equilibrium. For example, if a reactant concentration is increased by adding it then the reaction shifts to the product side so that the added reaction could be used.

The reaction is exothermic in nature as heat is a product means the heat is released in the reaction.

So, if the heat is added then reaction must shift to the left side so that the added heat could be used.

Similarly, if the reaction mixture is cooled then reaction shifts to the right side so that the heat could be generated.

Hence, both the statements are true and A is the correct choice.

Answer:

A is correct

Explanation:

what family has the most reactive metals give an example (symbol and name)

Answers

The elements of Group 1 (the alkali metals) have the most reactive metals.

Cesium (Cs) is so reactive that it reacts explosively with water.

The alkali metal family contains the most reactive metals, with sodium (Na) as an example of a highly reactive alkali metal.

The most reactive metals are found in the alkali metal family, which is located in group 1 of the periodic table. The reactivity of metals in this group increases as you move down the group. An example of an alkali metal is sodium (Na), which is known for its high reactivity, especially with water, often producing hydrogen gas and a strong exothermic reaction.

Apart from alkali metals, the alkaline earth metals in group 2 are also relatively reactive but less so than alkali metals. For instance, calcium (Ca) is an alkaline earth metal that reacts with water, albeit less vigorously than sodium or other alkali metals. In contrast, the noble gases in group 18, such as helium (He) and neon (Ne), are known for their lack of reactivity, hence the term 'inert gases.'

There are four fundamental forces in the universe. One of these helps hold the nuclei of atoms together. This force, which helps _______ overcome their natural inclination to repel each other is called the ___________ force. A) protons; strong B) protons; electromagnetic C) subatomic particles; strong D) protons and electrons; weak

Answers

The force which helps protons overcome their natural inclination to repel each other is call the strong force. A

Final answer:

The force that helps protons overcome their natural repulsion and holds atomic nuclei together is the strong nuclear force, making option A (protons; strong) the correct answer.

Explanation:

There are four fundamental forces in the universe, one of which plays a critical role in maintaining the structure of atomic nuclei despite the electrostatic repulsion between protons. This force, which helps protons overcome their natural inclination to repel each other, is known as the strong nuclear force. The strong nuclear force acts not only between protons but also between neutrons, and between protons and neutrons, effectively holding the nucleus of an atom together. It is much stronger than the electrostatic repulsion between the positively charged protons within the distances found inside the nucleus but becomes virtually non-existent over larger distances.

Thus, the correct answer to the question is: This force, which helps protons overcome their natural inclination to repel each other, is called the strong nuclear force, corresponding to option A) protons; strong.

The periodic table was arranged so that properties could be predicted for elements, just by looking at their position in relation to other elements. Consider two of the group 2 elements, Magnesium and Strontium. Which statement accurately describes the difference in the atomic radius?
Magnesium has a larger atomic radius because it has a lesser effective nuclear charge.
Strontium has a larger atomic radius because it contains more protons. Magnesium has a smaller atomic radius because it has 2 valence electrons. Strontium has a larger atomic radius because Strontium has more shells of electrons than Magnesium does.

Answers

Strontium has a larger atomic radius because it has more shells of electrons than magnesium does.

Mg is in Period 3 and Sr is in Period 5. Thus, Sr has two more shells of electrons than Mg.

Each shell is bigger than the one before it, so Sr has a larger atomic radius than Mg.

Both Sr and Mg have the same number of valence electrons, so they are not a factor in determining the atomic radius.

The nucleus is so small compared to the size of an electron shell that its size is not a factor in determining the atomic radius.

Explain how a wedge changes an input force

Answers

It is the ratio of the output force to the input force. A wedge applies more force to the object than the user applies to the wedge, so the mechanical advantage of a wedge is greater than 1. A longer, thinner wedge has a greater mechanical advantage than shorter, wider wedge.

A wedge, a type of simple machine, transforms an input force into a larger output force by providing a mechanical advantage, which multiplies the force applied over a shorter distance. This is done by converting the applied force into two components and creating a separation or splitting effect. Real-world factors like friction reduce the efficiency of this conversion.

A wedge is a simple machine that transforms an input force into a larger output force. The principle of a wedge is similar to that of an inclined plane; it converts a single force into two components: one perpendicular to the wedge's surface (which pushes objects apart), and the other parallel to it (which helps to move the wedge further into the object). The mechanical advantage of a wedge is given by the ratio of the length of the sloped side to the thickness of the wedge. This provides a greater force over a shorter distance, compared to what would be required to separate the objects without a wedge. In terms of physics, the work done (force x distance) remains constant, but the force is effectively amplified due to the mechanical advantage.

When considering the efficiency of a wedge, it is important to account for friction and other real-world factors, as these will reduce the effectiveness with which the input force is converted into output force. In a frictionless scenario, a perfectly efficient wedge would convert all of the input work into output work, but in reality, some energy is always lost to heat and other forms of non-useful energy, making the actual mechanical advantage less than the ideal.

As an example, consider a situation in which a man uses a wedge to split a block of wood. If he exerts a force of 400 N, and the wedge exerts a force of 1,400 N on the wood, the mechanical advantage is the ratio of the output force to the input force, which in this case, is 1,400 N / 400 N = 3.5. However, if the wedge travels further than the separation of the crack, there is a loss in efficiency.

Is metalloid an insulator

Answers

Yes metalloids happen to behave as an insulator, sometimes being electric.

yes metalloid is an insulator

Mid- ocean ridges normally form where tectonic plates are A. converging B. diverging. C. Stationary. D. sliding past each other

Answers

Option B- Diverging is the correct answer.

Would it take 5 cell divisions for one original cell to produce 128 new cells?

Answers

Yes, it will take 5 cell divisions for one original cell to produce 128 cells.



NEED HELP! Assume that the variables x and y are INVERSELEY related. If k = 18, what is the y value for each of the following points? Be sure and record your data to be used in the following problem. x=1 y=______, x=2 y=______, x=3 y=_______, x=6 y=_______, x=9 y=______, x=18 y=_______
answers for 1 0.05, 9, 18
answers for 2 0.11, 9, 36
answers for 3 0.16, 6, 54
answers for 6 0.33, 3, 108
answers for 9 0.5, 2, 162
answers for 18 0.75, 1, 324

Answers

Answer:

Given data:

 x ∝ 1/y

Equation related to question:

 x = k/y ,                                                y = K / x

Part 1:

x=1 y=______ , K = 18

Solution:

Equation : y = K / x

Putting values:

y= 18 / 1 = 18       ,                               Hence  Y = 18

Part 2:

x=2 y=______ , K =18

Equation : y = K /x

Putting values:

y = 18/2 = 9         ,                              Hence y = 9

Part 3:

x=3 y=_______, K = 18

Equation : y = K /x

Putting values:

y = 18 / 3 = 54  ,                                  Hence y = 6

Part 4:

x=6 y=_______, K = 18

Equation : y = K /x

Putting values:

y = 18 / 6 = 108                                    Hence y = 3

Part 5 :

x=9 y=______, K = 18

Equation : y = K /x

Putting values:

y = 18 /9 = 2                                       Hence y = 2

Part 6:

x=18 y=_______ , k = 18

Equation : y = K /x

Putting values:

y = 18 / 18 = 324                                  Hence y = 1





Here are the answers:

BRAINLIEST IF CORRECT PLEASE USE WORK BONUS POINTS

2) what does the release or absorption of energy indicate?

a) physical and chemical changes
b) neither physical nor chemical changes
c) chemical change
d) physical change

Answers

the answer is a} physical and chemical changes

i think the answer is A. Physical and chemical changes

What is the mean of speed

Answers

Speed is the distance travelled per unit time.

speed.  and to go fast as fu*k boi

Identify when it is appropriate for a scientist to use highly technical jargon and a structured format in their writing.

in communicating with other scientists
in writing books that help interest the general public in science
during television or radio interviews
in providing information to the media

Answers

The only appropriate situation, would be in communicating with other scientists. Since these other scientists would know the jargon. All the other answers lead information to the general public, in which case jargon shouldn't be used.
Final answer:

For a scientist, using technical jargon and a structured format is appropriate when communicating with fellow scientists. However, when reaching out to the general public or media, more straightforward language is more effective.

Explanation:

In scientific writing, the utilization of technical jargon and a structured format is often applicable while communicating with other scientists. This is because other scientists are more likely to understand the highly technical terms due to their background and expertise. For instance, a molecular biologist writing a research paper for a peer-reviewed journal would engage an academic tone and utilize specific terminologies that his or her fellow scientists can understand. However, when scientists are writing books to generate interest among the general public, giving TV or radio interviews, or presenting information to the media, it’s crucial to simplify the language. This ensures that science remains accessible to non-specialists who may not be familiar with the jargon.

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The following equation shows the conversion of ethanol c2h5oh in a wine sample into acetic acid c2h4o2 through the action of oxygen from air c2h5oh+o2->c2h4o2+h2o this reaction drastically changes the taste of the wine. If 100.0mL of wine initially contained 12.0g of ethanol, and after a period of time 4.00g of acetic acid were detected, what percent of the ethanol had been converted?

Answers

Given:

Volume of wine = 100 ml

Initial Mass of ethanol = 12.0 g

Mass of acetic acid formed = 4.00 g

To determine:

% ethanol converted to acetic acid

Explanation:

Molar mass of C2H5OH (ethanol) = 46 g/mol

Molar mass of C2H4O2 (acetic acid) = 60 g/mol

The reaction of ethanol in air is:

C2H5OH + O2 → C2H4O2 + H2O

Based on the stoichiometry: 1 mole of ethanol produces 1 mole of acetic acid

Moles of ethanol initially present = mass of ethanol/molar mass

= 12/46 = 0.2609 moles

Moles of acetic acid produced = moles of ethanol converted

= 4/60 = 0.0667 moles

Mass of ethanol converted = Moles of ethanol * molar mass

= 0.0667 * 46 = 3.07 g

% ethanol converted = (mass of ethanol converted/initial mass )*100

% converted = (3.07/12.0) *100 = 25.6%

Ans: 25.6% of ethanol gets converted to acetic acid

       



determine whether the nucleus or the electron cloud contributes the most to the volume of an atom. Explain.

Answers

Answer:

The electron cloud

Explanation:

Rutherford’s gold foil experiment showed that the atom consisted of a tiny nucleus inside of a much larger electron cloud.

The diameter of the electron cloud is about 50 000 times that of the nucleus.

Final answer:

The electron cloud contributes the most to the volume of an atom, as it occupies almost all of the atom's space compared to the much smaller nucleus that contains most of the mass.

Explanation:

To determine whether the nucleus or the electron cloud contributes the most to the volume of an atom, we need to consider the structure of an atom. An atom is made up of a nucleus, containing protons and neutrons, and an electron cloud that contains electrons. While the nucleus contains nearly all of the atom's mass due to the relative mass of protons and neutrons, it's the electron cloud that occupies the majority of an atom's volume. The comparison in size is dramatic: If the nucleus were a blueberry, the atom could be the size of a football stadium, with the empty space being the difference between the two.

The electron cloud, which is where electrons have a significant probability of being found, does not have a definite boundary. Nevertheless, the space that is encompassed within where an electron can be found with 95% probability is used to define an atom's size. Given these facts, the electron cloud contributes far more to an atom's volume than the dense, compact nucleus at the center.

how are the three beams on a triple beam balance different

Answers

The size difference between the beams indicates the weights and reading scales that each beam measures.

What is triple beam balance?

The triple beam balance is a precision instrument for measuring mass. It gets its name from its three beams, with the middle beam being the largest, the far beam being medium in size, and the front beam being the smallest.

It is made up of three beams, each with a single sliding weight whose size corresponds to the gradations of the notched scale on the beam.

It gets its name from its three beams, with the middle beam being the largest, the far beam being medium in size, and the front beam being the smallest.

The size variation among the beams implies the weights and reading scales that each beam measures.

Thus, these are the differences between the three beams on a triple beam balance.

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what is the molarity of a solution that contains 9.63 grams of hcl in 1.5 liters of solution

Answers

Molar mass HCl = 36.5 g/mol

number of moles:

mass of solute / molar mass:

9.63 / 36.5 => 0.263 moles

Volume = 1.5 L

M = n / V

M = 0.263 / 1.5

M = 0.1753 mol/L

What volume is equivalent to 12.0 m3?

Answers

I just scored the test I'm 100% sure its: 1.2 x 10^10 mm^3

CHECK THE ATTACHMENT FOR COMPLETE QUESTION.

The correct answer to the question is 1.2 × 10∧10 mm³

Given:

Volume = 12m³

volume of a substance  can be regarded as quantity of specific or given  substance.

Volume = 12m³

But

1m³ = 10∧9 mm³

Then if 1m³ = 10∧9 mm³ we can say

1m³ = 10∧9 mm³

12m³ = X mm³

Where X is the required volume in mm³

If we cross multiply, we have

( 1m³ × X ) =( 10∧9 mm³ × 12 m³ )

Make X subject of the formula

X = 12 × 10∧9 mm³

multiply we have

=1.2 × 10∧10 mm³

Therefore, equivalent volume of 12m³

is 1.2 × 10∧10 mm³

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The beginning expansion of the big bang happened relatively slowly compared to how it is expanding now.

A. True

B. False

Answers

A. True_________________

The statement reporting the expansion nowadays has been faster than the expansion after the big bang theory has been true. Thus, option A is correct.

The expansion of the universe has been based on the distance in between the celestial bodies concerning the forces. The big bang theory has been responsible for the explosion that has been led to the arrangement of the bodies in the universe that has been based on their sizes and force.

However, there has been an explosion that has been slowed down after the big bang theory. Although in recent years there has been the presence of dark energy found that has been responsible for the increased expansion of the universe.

Thus, the statement reporting the expansion nowadays has been faster than the expansion after the big bang theory has been true. Thus, option A is correct.

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The chief advantage of the metric system over other systems of measurement is that it ____.

A. has more units
B. is in multiples of 10
C. is in multiples of 15
D. is derived from nature itself

Answers

The chief advantage of the metric system over other systems of measurement is that it B. is in multiples of 10.

This can be seen in the picture below that shows the prefixes of the metric system.


Answer:

The correct answer is option B, that is, is in multiples of 10.

Explanation:

The metric system refers to an internationally acclaimed decimalized system of measurement. It is used globally, and it is the most usual or the only system of measures and weight in the places where it is adopted.  

As the metric system is a decimal system of measures and weight, it is easy to transform in between the units, for example, from grams to kilograms, or from millimeters to meters, basically by dividing or multiplying by 10, 100, 1000, and others. Usually, this is the case of moving the decimal point to the left from the right.  

H E L P ASAP Give two examples of minerals that have a property in common.

Answers

Muscovite and biotite mica are the two minerals that a property in common which is tenacity .

Tenacity is the ability of the mineral to resist breakage. It is described in terms such as elastic, felixible etc.

Both muscovite and biotite mica are elastic minerals as these minerals bend when force is applied on them, but they regain their original shape when the external force is removed.



This represents three steps of the rock cycle. The sediments are layered and compressed in sedimentary rock. The sedimentary rock is heated and compressed to form metamorphic rock. One thing remains the same from start to finish: the total amount of minerals present.

This process represents an important scientific law. What is it?
A) law of motion
B) law of thermodynamics
C) law of conservation of mass
D) law of conservation of energy

Answers

The correct answer should be the law of thermodynamics, because the sedimentary rock, like in the question, is being heated and compressed to form metamorphic. And this has to do with Thermodynamics.

ANSWER: C) Law of Conservation of Mass

EXPLANATION: In the given cycle, it is seen that th sediments are layered and gets compressed into sedimentary rocks which eventually gets heated and compressed to form metamorphic rocks. But, the total amount of minerals present in the sediments remains the same throughout any stage of the cycle.

This proves the law of conservation of mass which states that mass can not be created nor be destroyed, it can only be transferred from one form to another. So, in this case, only phase transition occurred but the component which is mineral inside the sediments remains constant.

Therefore, the answer is law of conservation of mass.

Find the volume of 20g of benzene

Answers

(d) Density of Benzene: 0.8786 g/cm cubed

(m) Mass: 20.00g

Formula to solve (v) volume of benzene: V=m/d

V=20g / 0.8786g/cm cubed

Answer: Volume of benzene is: 22.8 cm cubed  


Explanation: Well, density is mass divided volume. In this, it is what the volume is. All you need is mass divided by density. Hope this helps!

Who determined that the elements needed to be arranged by atomic number instead of atomic mass?

Answers

the person you are looking for is Dmitri Mendeleev

The answer on Edge is Moseley.

What are the properties of ionic covalent compounds?

Answers

Ionic compounds are formed from strong electrostatic interactions between ions, which result in higher melting points and electrical conductivity compared to covalent compounds. Covalent compounds have bonds where electrons are shared between atoms.

1. Tell the number of atoms of each element in these compounds. (1pt per blank) N2O3 _____atoms of Nitrogen ______ atoms of Oxygen CaCO3 _____atoms of Calcium _____atoms of Carbon _____atoms of Oxygen

Answers

Answer:- [tex]N_2O_3[/tex] has 2 atoms of nitrogen and 3 atoms of oxygen. [tex]CaCO_3[/tex] has 1 atom of calcium, 1 atom of carbon and 3 atoms of oxygen.

Explanations:- The numbers written as subscripts for the elements in formulas of the compounds represents the number of atoms of that particular element.

The first compound is [tex]N_2O_3[/tex] and in this the subscript of N is 2 and that of O is 3. It means it has 2 atoms of N and 3 atoms of O.

Second compound is [tex]CaCO_3[/tex] and in this the subscript of Ca is not shown it means it is 1, similarly the subscript of C is 1 and subscript of O is 3. So, the compound has 1 atom of Ca, 1 atom of C and 3 atoms of O.


which plants do siamangs rely on most as a source of their food

Answers

They seem to eat a lot ranging from woody plants to vines, though in the rainforest most of their diet is made up of Malaysia and plant material, to be more specific

So I would go with leaves, 50%

Flowers, buds, and insects, 10%

Fruits, 40%


--They also really like figs

Siamangs primarily rely on leaves for their diet, being folivorous, and are native to tropical forests of Southeast Asia where they feed on indigenous foliage.

Siamangs, the largest of the Hylobatidae family and classified among the \lesser apes\, are native to the tropical forests of Southeast Asia. They are quite distinct in their dietary habits, with a strong preference for being folivorous, meaning they primarily eat leaves. On the other hand, their relatives, the gibbons, are more \frugivorous\, favoring a diet composed mainly of fruit.

Siamangs are known for their large size—about twice that of gibbons—and their unique black coloration with large throat sacs used for their characteristic vocalizations. Unlike their larger ape counterparts, they do not make nests but instead sleep on their callused ischium resembling ischial callosities.

The domestication of plants in Thailand, a region within the siamangs' range, included the cultivation of various roots, cucumbers, peppers, and beans, and encouraged the growth of banana, coconut, sago, and breadfruit trees. Although siamangs are wild animals and do not rely on domesticated crops for food, their diet in natural habitats includes \foliage\ from indigenous plants found in the dense tropical forests of the region.

How many moles of HCl would react with 37.1 mL of 0.138 M Sr(OH)2

Answers

Answer is: 0.102 moles of HCl would react.

Balanced chemical reaction:

2HCl(aq) + Sr(OH)₂ → SrCl₂(aq) + 2H₂O(l).

V(Sr(OH)₂) = 37.1 mL ÷ 1000 mL/L.

V(Sr(OH)₂) = 0.0371 L; volume of the strontium hydroxide solution.

c(Sr(OH)₂) = 0.138 M; molarity of the strontium hydroxide solution.

n(Sr(OH)₂) = c(Sr(OH)₂) · V(Sr(OH)₂).

n(Sr(OH)₂) = 0.0371 L · 0.138 mol/L.

n(Sr(OH)₂) = 0.0051 mol; amount of the strontium hydroxide.

From balanced chemical reaction: n(Sr(OH)₂) : n(HCl) = 1 : 2.

n(HCl) = 2 · n(Sr(OH)₂).

n(HCl) = 2 · 0.0051 mol.

n(HCl) = 0.0102 mol; amount of the hydrochloric acid.

Final answer:

The question involves stoichiometry in a chemical reaction between hydrochloric acid (HCl) and strontium hydroxide (Sr(OH)2). The provided volume and molarity of Sr(OH)2 allow us to calculate the needed moles of HCl, which revolves around a 2:1 stoichiometric ratio. Therefore, to react with 37.1 mL of 0.138 M Sr(OH)2, we need 0.0102 moles of HCl.

Explanation:

The subject matter involves a chemical reaction between hydrochloric acid (HCl) and strontium hydroxide (Sr(OH)2). First, we need to identify the stoichiometric ratio between HCl and Sr(OH)2. The chemical equation for their reaction is 2HCl + Sr(OH)2 → SrCl2 + 2H2O, indicating a 2:1 ratio between HCl and Sr(OH)2.

Next, calculate the moles of Sr(OH)2 using the given volume and molarity: 37.1 mL Sr(OH)2 * (1 L/1000 mL) * 0.138 mol/L = 0.0051 mol of Sr(OH)2. Since the ratio of HCl to Sr(OH)2 is 2:1, this means we would need 2 * 0.0051 = 0.0102 moles of HCl for the reaction.

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What mass of bromine reacts with 16.2 g of aluminium?

Answers

Final answer:

To find the mass of bromine that reacts with 16.2 g of aluminium, we need to use the concept of stoichiometry. According to the balanced chemical equation, 2 moles of aluminium react with 3 moles of bromine. By converting the mass of aluminium to moles and using the mole ratio, we can determine the moles of bromine required. Finally, converting the moles of bromine to grams gives the mass of bromine.

Explanation:

To determine the mass of bromine that reacts with 16.2 g of aluminium, we need to use the concept of stoichiometry, which is the quantitative relationship between reactants and products in a chemical reaction.

The balanced chemical equation for the reaction between bromine and aluminium is:

2Al + 3Br2 → 2AlBr3

From the equation, we can see that 2 moles of aluminium react with 3 moles of bromine to produce 2 moles of aluminium bromide. Therefore, we need to convert the mass of aluminium to moles, and then use the mole ratio to find the moles of bromine required. Finally, we can convert the moles of bromine to grams.

Let's calculate step by step:

Convert 16.2 g of aluminium to moles using its molar mass of 26.98 g/mol.Use the mole ratio from the balanced equation to find the moles of bromine.Convert the moles of bromine to grams using its molar mass of 79.90 g/mol.

By following these steps, you will be able to find the mass of bromine that reacts with 16.2 g of aluminium.

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1. The underlined portion of the chemical formula above is the _____ and it represents ____________________.


A.coefficient; how many Hydrogen atoms there are in one molecule

B.subscript; how many Hydrogen atoms there are in one molecule

C.coefficient; how many water molecules there are

D.subscript; how many water molecules there are




2. Is 2H2 +O2 -> 2H2O.a balanced chemical equation? Is it obeying the law of conservation of matter?


A.Yes, the equation is balanced.  There are the same number of Hydrogen (H) and Oxygen (O) atoms on both sides of the equation.

B.No, the equation is not balanced.  The Hydrogen (H) in the equation has less atoms represented on the products.

C.No, the equation is not balanced.  The Oxygen (O) in the equation has less atoms represented on the products.

Answers

1. The correct answer is B. Subscript; how many hydrogen molecules which are there  in that one molecule.

Chemical formula above is a superscript and it represents hydrogen molecules in one molecule.

2. The correct answer is C. No, the equation is not balanced. In the equation the oxygen it has less atoms which represents the products.

A 62.6-gram piece of heated limestone is placed into 75.0 grams of water at 23.1°C. The limestone and the water come to a final temperature of 51.9°C. The specific heat capacity of water is 4.186 joules/gram degree Celsius, and the specific heat capacity of limestone is 0.921 joules/gram degree Celsius. What was the initial temperature of the limestone? Express your answer to three significant figures.

Answers

m₁ = mass of water = 75 g

T₁ = initial temperature of water = 23.1 °C

c₁ = specific heat of water = 4.186 J/g°C


m₂ = mass of limestone = 62.6 g

T₂ = initial temperature of limestone = ?

c₂ = specific heat of limestone = 0.921 J/g°C


T = equilibrium temperature = 51.9 °C

using conservation of heat

Heat lost by limestone = heat gained by water

m₂c₂(T₂ - T) = m₁c₁(T - T₁)

inserting the values

(62.6) (0.921) (T₂ - 51.9) = (75) (4.186) (51.9 - 23.1)

T₂ = 208.73 °C

in three significant  figures

T₂ = 209 °C

Final answer:

To find the specific heat capacity of the metal, we can use the formula: q = mcΔT, where q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Substituting the given values and solving, we find that the specific heat capacity of the metal is approximately 0.252 J/g °C.

Explanation:

To find the specific heat capacity of the metal, we can use the formula: q = mcΔT, where q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. In this case, we know the initial and final temperatures of the metal, as well as the mass of the water, so we can plug these values into the equation. Rearranging the equation to solve for c, we have: c = q / (mΔT). Substituting the values and solving, we find that the specific heat capacity of the metal is approximately 0.252 J/g °C.

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