A material has a density of 8.9 g per c m cubed. You have three cubic centimeters of the substance. What is the material's mass in grams?

Question 25 options:

3.0 g


0.3 g


27 g


5.9 g

1 tonne of carbon dioxide has been dissolved in a sample of ocean water, which has a pH of 5.76.

The first step is to convert the given mass of carbon dioxide (1 ton) to moles. Since 1 ton = 2000 pounds, and 1 pound = 0.45 kilograms, 1 ton = 907.18 kilograms. To convert this to moles, we need to divide by the molar mass of \(CO_2\), which is 44.01 g/mol.

Therefore, the number of moles of \(CO_2\) in 1 ton is \(\frac{ 907.18}{44.01} = 20.59 moles.\)

Next, we need to convert the given volume of ocean water (1.0x10 gallons) to liters. Since 1 gallon = 3.785 liters, the given volume is \(3.785*10^{10}\) liters.

Thus, the number of moles of \(CO_2\) per liter of ocean water is \(\frac{20.59}{3.785*10^{10}}= 5.45*10^{-10} moles/liter\)

Now, we can calculate the pH of the sample.When carbon dioxide and sea water react, the equilibrium constant is (\(1.2*10^{-9}\)) along with the acid dissociation constant (Ka.) for \(H_2CO\) is (\(4.3*10^{-7}\)). The pH of the sample can be calculated using the Henderson-Hasselbalch equation:

\(pH = pK_a + log(\frac{[base]}{[acid]})\)

where [base] is the base's concentration (\(CO_2\))and [acid] is the acid's concentration.(\(H_2CO_3\)). Since we already calculated the concentration of \(CO_2\), We only have to determine the concentration of \(H_2CO_3\),This is equivalent to the amount of \(CO_2\) times the equilibrium constant:

\([H_2CO_3] = [CO_2] * K\\ = 5.45*10^{-10} moles/liter *1.2*10^{-9}\\ \\ = 6.54*10^{-19} moles/liter\)

Now, we can plug all the values into the Henderson-Hasselbalch equation to calculate the pH:

\(pH = -log(4.3*10^{-7}) + log(\frac{5.45*10^{-10}}{6.54*10^{-19}})\\pH= 5.76\)

Therefore, the pH of the sample of ocean water with 1 ton of carbon dioxide dissolved in it is 5.76.

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The answer is  TRUE. An electrochemical cell can extract electrical energy from a reactant-favored chemical reaction. This process involves the conversion of chemical energy into electrical energy, allowing for the generation of electricity.

An electrochemical cell is a device that converts chemical energy into electrical energy through redox reactions. In a reactant-favored chemical reaction, the reactants have a higher tendency to undergo a chemical reaction to form products. By utilizing this chemical reaction in an electrochemical cell, electrical energy can be extracted as a result of the transfer of electrons from the reactants to the electrode. This process is commonly used in batteries and fuel cells to provide electrical energy for various applications.

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Answer:

Explanation:

Properties of Covalent Molecular Compounds.

Low melting points and boiling points. ...

Low enthalpies of fusion and vaporization These properties are usually one or two orders of magnitude smaller than they are for ionic compounds.

Soft or brittle solid forms. ...

Poor electrical and thermal conductivity.

soft and brittle

bad thermal conductivity

etc.

there's a list just search what you are looking for

Answer:

d)the energy possessed by an electron at a set distance from the nucleus

The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers. The elements are arranged in the increasing order of their atomic numbers.

Here the element Lithium is a alkali metal which is located in the group 1 of the periodic table and placed in the second period. Its atomic number is 3. Alkali metals are highly electropositive and are good reducing agents.

Lithium reacts with the elements of groups 16 and 17 and form compounds, they also burn in oxygen and react with water.

The reaction of lithium with water is:

2Li + 2H₂O → 2LiOH + H₂

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The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

This has become common practice, in my opinion, since scientists need to exchange ideas.

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Answer:

It lead to scientific breakthroughs in chemistry.

Explanation:

Explanation:

i think the answer is first and last

The correct answer is option A. The mass of the sample decreased, so physical changes occurred as the metal first melted and then boiled out of the crucible. The decrease in mass is a result of the metal melting and then vaporizing as it is heated.

Physical changes refer to changes in the physical properties of a substance without altering its chemical composition. Examples of physical changes include melting, freezing, condensation, vaporization, sublimation, and physical state changes. Physical changes occur when a substance changes from one state of matter to another without a chemical reaction taking place.

This is an example of a physical change, as the material is changed from a solid to a liquid and then to a gas, but its chemical composition remains the same.

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Answer:

NaOH forms Na + and OH- when added into water

Answer:

(1) See below, (2) About 8.4 pH, (3) About 3.981 * 10⁻⁶ mol dm⁻³

Explanation:

1. A buffer is a solution that resist pH when adding a basic or acidic compound. It's purpose is to neutralize added acids and bases.

2. Remember that the formula for pH is -log [H+]. We have a 0.1 M solution of baking soda in water with [H+] of about 4.0 × 10⁻⁹. Therefore we can calculate the pH as follows...

pH = -log (4.0 × 10⁻⁹)

pH = -(-8.39794...) = (About) 8.4 pH of 0.1 M of baking soda

3. This question has a similar set up...

pH = -log [H+]

[H+] = inverse of log^- pH

[H+] = 10^-5.4 = (About) 3.981 \(*\) 10⁻⁶

Answer:

0.16 cal/g°C

Explanation:

The following data were obtained from the question:

Mass (M) = 15 g

Heat (Q) = 60 calories

Temperature change (ΔT) = 25 °C

Specific heat capacity (C) =..?

We, can obtain the specific heat capacity of the substance as shown below:

Q = MCΔT

60 = 15 × C × 25

60 = 15 × 25 × C

60 = 375 × C

Divide both side by 375

C = 60/375

C = 0.16 cal/g°C

Therefore, the specific heat capacity of the substance is 0.16 cal/g°C

The question is incomplete, the complete question is;

A student investigated some properties of lead and recorded the findings in the table below. Property Observation Color Dull gray Density 11.3 g/cm3 Volume of sample 3 cm3 Melting point 327°C Reaction with air Lead oxide forms on the surface Electrical conductivity Conducts some electricity Which statement is true with respect to the investigation?

A. The student investigated only the physical properties of lead.  

B. The student investigated only the chemical properties of lead.  

C. The student investigated more physical properties than chemical properties of lead.  

D. The student investigated more chemical properties than physical properties of lead.

Answer:

The student investigated more physical properties than chemical properties of lead.

Explanation:

If we look at the things mentioned in the question as regards the approach of the student towards the study of lead, we will discover that he/studied;

Colour, density, volume, melting point and electrical conductivity which are all physical properties. Physical properties of a substance does not involve chemical reactions of the substance under study.

The only chemical property studied by the student is its formation of an oxide- lead oxide with air as follows;

2Pb(s) + O₂(g) → 2PbO(s)

Thus we can safely conclude that; the student investigated more physical properties than chemical properties of lead.

Answer:

c

Explanation:

edge 2021 :)

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Answer:

so no germs get in the cut an cause an infection

Explanation:

It's important to wash and disinfect a cut to prevent an infection and to make it heal.

The separation scheme for the isolation of caffeine from the ground tablets include the steps: Grinding, Extraction, Filtration, Evaporation, Purification, Recrystallization and Drying.

Here is a detailed separation scheme for the isolation of caffeine from ground tablets. Here is a step-by-step procedure:

Grinding: Grind the tablets containing caffeine to a fine powder to increase the surface area for extraction.

Extraction: Perform multiple extractions using a suitable solvent, such as ethyl acetate or dichloromethane. Add the solvent to the powdered tablets and mix thoroughly. Allow the mixture to stand for some time to allow the solvent to dissolve the caffeine.

Filtration: Filter the mixture to separate the solid residue (containing excipients and impurities) from the solvent extract (containing caffeine).

Evaporation: Evaporate the solvent from the filtrate using a rotary evaporator or by allowing it to evaporate naturally. This will leave behind a crude caffeine residue.

Purification: Dissolve the crude caffeine residue in a minimal amount of a suitable solvent, such as hot water or ethanol. Filter the solution if necessary to remove any remaining insoluble impurities.

Recrystallization: Slowly cool the filtered solution to induce crystallization of pure caffeine. Collect the formed crystals by filtration and wash them with a small amount of ice-cold solvent to remove any impurities.

Drying: Allow the purified caffeine crystals to air dry or use a desiccator to remove any remaining moisture.

The resulting product should be relatively pure caffeine. Please note that this is a simplified outline, and specific details may vary depending on the specific extraction and purification techniques used.

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Group A represents arguments for free trade. The reasons provided in Group A support the idea of promoting free trade and removing barriers to international trade. That, the consumers have a larger variety of goods and

services to choose from. U.s. companies should be forced to keep prices low. A better climate is created for investment and entrepreneurship.

The group emphasizes the benefits of having a larger variety of goods and services available for consumers to choose from, and how free trade encourages a better climate for investment and entrepreneurship. They do not believe in forcing companies to keep prices low, as that goes against the principles of a free market economy.

On the other hand, Group B's arguments suggest a need for protectionism and limitations on free trade, as they prioritize the growth and protection of certain industries and the national security of the country. They believe that countries should diversify to avoid dependence on a few industries, but this can be achieved through strategic planning and policies rather than limiting free trade.

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Answer: (D) Thermal

Explanation: This is Thermal because it is the only one that makes sense  

Answer:

Repetition

Explanation:

In the world of science, experiments are regularly conducted to test out hypotheses. These experiments are however, not conducted by scientist once to derive a result. They are rather conducted multiple times (repeated) to ascertain the accuracy i.e not as a result of random occurrence. The experiments that undergo multiple trials are said to undergo REPETITION.

This is the case of the scientist in this question, who is conducting an experiment to test what temperature causes the fastest growth rate in sunflower plants. He conducted the experiment multiple times, making it an example of REPETITION.

N.B: Replication is when the experiment is re-conducted by another scientist to see if same result is derived.

Option A is the correct answer: A negative change in entropy indicates that the system has become more ordered.

What is Entropy?

Entropy is a thermodynamic property that describes the degree of disorder or randomness in a system. It is a measure of the number of ways in which the energy of a system can be distributed among its particles. The greater the number of possible arrangements, the higher the entropy of the system.

It is denoted by the symbol S and is measured in units of joules per Kelvin (J/K).

A negative change in entropy indicates that the system has become more ordered. .If the entropy decreases, it means that the system has become more ordered or less random.

For example, when a gas condenses into a liquid, the particles become more ordered and the entropy decreases. Similarly, when a crystal forms from a solution, the molecules become more ordered and the entropy decreases. In both of these cases, the change in entropy is negative.

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The order of decreasing metallic character is > Ca > Co > Cr > Zn > P > S > F.

The metallic character of an element is determined by its ability to lose electrons during a chemical reaction. Metals tend to lose electrons easily, while non-metals tend to gain electrons.

Rb (Rubidium) is the most metallic element in this group, as it is in Group 1 of the periodic table.

Ca (Calcium) is a Group 2 metal and has a strong metallic character.

Co (Cobalt) and Cr (Chromium) are both transition metals, which exhibit metallic character but to a lesser extent than Group 1 and 2 metals.

Zn (Zinc) is a metal, but it has a lower metallic character compared to the aforementioned elements.

P (Phosphorus) and S (Sulfur) are non-metals and show little to no metallic character.

F (Fluorine) is the least metallic element of this group, as it needs to gain one electron to achieve a stable noble gas configuration.

Therefore, the elements in order of decreasing metallic character are Rb > Ca > Co > Cr > Zn > P > S > F.

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If 50 g of potassium nitrate is added to 100 g of water at 30 degrees Celcius, 30 gram of potassium nitrate will not dissolve.

A solubility curve is a curve that is produced when the amount of solute that dissolves in a given volume of solvent is plotted against the temperature of the solution formed.

A solubility curve can be used to predict the amount of a given solute that will dissolve in a given amount of solvent at a particular temperature.

The solubility curve of potassium nitrate is shown in the attachment.

At 30°C, the solubility of potassium nitrate is 20 g/100 g of water.

Hence, the amount of potassium nitrate that will remain undissolved when 50 g of it is added to 100 g of water at 30°C will be:

Amount left undissolved = 50 - 20 g

Amount left undissolved = 30

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The part that is the source of the activation energy required is the flame and the reaction is endothermic.

In this scenario, the source of the activation energy required is the flame on the gas stove. The flame provides the heat energy necessary to increase the kinetic energy of the water molecules and cause them to move faster, resulting in an increase in the temperature of the water.

The process of heating the water is an endothermic reaction because energy is being absorbed from the surroundings (in this case, from the flame) in order to increase the temperature of the water.

As the water absorbs heat energy from the flame, the potential energy of the water molecules increases, causing them to move faster and collide more frequently, which leads to an increase in the temperature of the water.

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The chemical formula for francium phosphide is FrP.

A chemical formula is described as a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.

There are three main types of chemical formulas which include :

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To solve this, we must know each and every concept related to friedel-crafts alkylation reaction. Therefore, the correct option is option E among all the given options.

The Friedel-Crafts synthesis is just an aromatic chemical method in which an electrophilic substitution substitution takes place. The hydrogen in benzene is replaced by an electrophile in the vicinity of a Lewis acid, like anhydrous aluminium chloride.

Friedel-Crafts Alkylation is a chemical process in which the proton of an aromatic molecule is replaced with an alkyl. This reaction happens when there is  anhydrous aluminum chloride. Anhydrous aluminium chloride can be replaced with other Lewis acids, like FeCl\(_3\).

Therefore, the correct option is option E.

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Answer:

The answer is C.

Explanation:

Oxygen- This is also an important cause of chemical weathering.

The final temperature of the system is approximately 25.98°C.

To find the final temperature of the system, we can use the principle of conservation of energy. The equation we can use is:

m1_c1(T_f - T1) + m2_c2(T_f - T2) = 0

Where: m1 = mass of iron = 0.25 kg

c_1 = specific heat capacity of iron = 448 J/kg°C

T1 = initial temperature of iron = 100°C m2 = mass of water = 1.00 kg

c_2 = specific heat capacity of water = 4186 J/kg°C

T2 = initial temperature of water = 24.0°C

T_f = final temperature of the system (what we're trying to find)

Plugging in the values, we get:

(0.25 kg)(448 J/kg°C)(T_f - 100°C) + (1.00 kg)(4186 J/kg°C)(T_f - 24.0°C) = 0

Simplifying the equation, we have:

112(T_f - 100) + 4186(T_f - 24) = 0

112Tf - 11200 + 4186Tf - 100464 = 0

4298Tf = 111664

T_f = 111664/4298

T_f ≈ 25.98°C

Therefore, the final temperature of the system is approximately 25.98°C.

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Answer:

Because the rock is irregularly shaped, you used the displacement  method to measure its volume.  You used  calculations  to indirectly find the density  of the objects.

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Because the rock is irregularly shaped, you used the displacement method to measure its volume. You used calculations to indirectly find the density of the objects. Thus, option 1. b and 2. a is correct.

"Density has been defined as the ratio of the mass of the object to the volume of the substance." The mass of the object must be in grams and the volume is in the liter, milliliter, or cubic centimeter.

The density of the irregular-shaped rock can be calculated by the displacement method so that the volume of the rock can be estimated. The displacement method is used to calculate the volume of irregularly shaped objects. The formula is given as,

m = ρV

Here, m is mass, ρ is density and V is volume.

Therefore, the indirect calculation can be used to estimate the density.

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