How do you know a physical change has occurred when evaporating water produces gaseous water?

A
A chemical change has resulted in a new substance.

B
A chemical change has resulted in a change of state.

C
A physical change has resulted in a phase change, not a change in composition.

Answer:

C & D

Explanation:

The attractive force between particles of a liquid determines the temperature at which the liquid changes state: the stronger the attraction, the larger amount of energy is required to break the bonds to boil; i.e. at a higher temperature. So C. Strong attractions mean the liquid boils at a higher temperature is correct.

By the same reasoning, the stronger attractive force between particles also means that it takes more energy to change state from solid to liquid; i.e. a higher melting point.  So D. Strong attractions mean the liquid melts at a higher temperature is also correct.

(i) The vehicle outputs approximately 11.58 kg of CO₂ per week. (ii) The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers.

To calculate the amount of CO₂ output per week, we need to determine the amount of fuel used and then use the given combustion equation to find the ratio of CO₂ produced per unit of fuel.

Given;

Average fuel efficiency: 7.5 km per litre

Distance traveled per week: 300 km

Mass of fuel per litre: 0.75 kg

First, we calculate the total fuel used per week;

Fuel used = Distance traveled / Fuel efficiency

= 300 km / 7.5 km per litre

= 40 litres

Next, we find the mass of fuel used per week:

Mass of fuel used = Fuel used × Mass of fuel per litre

= 40 litres × 0.75 kg per litre

= 30 kg

Using the combustion equation, we know that 2 moles of C₈H₁₈ produce 16 moles of CO₂. Therefore, we can calculate the moles of CO₂ produced from the given mass of fuel;

Moles of CO₂ produced = Moles of C8H18 × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30 kg / (114 g/mole)) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30,000 g / 114 g/mole) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= 263.16 moles of CO₂

Finally, we convert the moles of CO₂ to kilograms;

Mass of CO₂ produced = Moles of CO₂ produced × Molar mass of CO₂

= 263.16 moles × (44 g/mole)

= 11,579.04 g

= 11.58 kg (rounded to two decimal places)

Therefore, the vehicle outputs approximately 11.58 kg of CO₂ per week.

The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers to include a certain percentage of biofuels in their overall fuel sales, thereby reducing the carbon footprint by promoting the use of renewable and lower-carbon-emitting fuels.

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Answer: A The Triangle Fire was a tragedy that could have been prevented.

Explanation:

The Triangle Fire was a tragedy that happened in the factory of Shirtwaist Company in New York City where there was.a.fore outbreak and about 145 employees of the company were killed.

The deaths could have been prevented because the company neglected safety measures such as having a good and reliable pump system, having readily available fire extinguishers. Also, what resulted in the lethal nature of the incident was because the doors within the building of the factory were locked.

The tragedy generated lots of attention and series of laws were been out in place in order to ensure that workers are safe at their workplace.

When the exact composition and amounts of carbon and nitrogen in the media ingredients are unknown, these media are called complex media.

In microbiology and cell culture, media refers to the nutrient-rich solutions or mixtures used to support the growth and propagation of microorganisms or cells. These media typically contain various components such as carbon, nitrogen, minerals, vitamins, and other essential nutrients.  

When the exact composition and amounts of carbon and nitrogen in the media ingredients are unknown, the media are referred to as complex media. Complex media are usually made from natural sources, such as yeast extract, beef extract, or peptone, which contain a mixture of nutrients in undefined proportions.

Complex media are commonly used in laboratory settings when the precise requirements of the microorganisms or cells being cultured are not well-defined or understood. They provide a broad range of nutrients that support the growth of a wide variety of organisms.

Contrastingly, defined or synthetic media have a precisely known composition, with the exact amounts and sources of carbon, nitrogen, and other nutrients specified. These media are used when researchers need precise control over the nutrients provided to the microorganisms or cells, allowing for specific growth conditions and experiments.

When the composition and amounts of carbon and nitrogen in the media ingredients are unknown, the media are called complex media. Complex media are used when the precise requirements of the microorganisms or cells are not well-defined, providing a mixture of nutrients that can support the growth of various organisms.

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In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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Answer:

Anemometer. An anemometer is a type of weather instrument that measures wind speed.

φ(g1 * g2) = eH = φ(g1) * φ(g2).

This completes the proof that φ: G → H is a group homomorphism.

By showing that the map φ preserves the group operation, we have demonstrated that it is a group homomorphism.

To prove that φ: G → H is a group homomorphism, we need to show that it preserves the group operation. In other words, for any two elements g1 and g2 in G, φ(g1 * g2) = φ(g1) * φ(g2), where * denotes the group operation in G, and * denotes the group operation in H.

Given that φ(g) = eH for all g ∈ G, where eH is the identity element in H, we can start the proof as follows:

Let g1, g2 ∈ G. We want to show that φ(g1 * g2) = φ(g1) * φ(g2).

Since φ(g) = eH for all g ∈ G, we have φ(g1) = eH and φ(g2) = eH.

Now, consider the product g1 * g2 in G. Applying φ to both sides, we have:

φ(g1 * g2) = φ(g1) * φ(g2).

Substituting the values of φ(g1) and φ(g2), we get:

φ(g1 * g2) = eH * eH.

Since eH is the identity element in H, the product eH * eH is simply eH.

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Due to their stronger metallic bonding and more compact atomic structure, the transition elements have higher melting and boiling temperatures and are often denser than the alkali metals.

Elements from Group 1 have similar properties. All of them are supple silver metals. These metals are extremely reactive and have low melting temperatures due to their low ionisation energy. As you descend the chart, this family becomes more reactive.

The d orbitals of transitional elements are only partially filled. A transition element is defined by IUPAC as an element that may form stable cations and has an electron d subshell that is only partly filled.

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im pretty sure its B

Explanation: also pretty sure we might be from the same class-

Answer:

Carbon atoms each form four strong bonds. The bonds are covalent (atoms share electrons). This gives graphite its characteristic properties such as high melting and boiling points, good electrical conductivity, and softness. Use as pencil 'lead', as a lubricant in oil, furnace linings, electrodes, neutron moderators in nuclear power stations.

Diamond atoms each form three strong covalent bonds in the same layer and one weak bond to an atom in another layer.  Diamonds have a high level of hardness, thermal conductivity, and optical dispersion. It is used for jewellery, oil-well drills, abrasives and cutting tools.

Explanation:

Structure of Graphite and Diamond (attached below):

Answer:

4.9 x 10²²hockey pucks

Explanation:

Given parameters:

Number of moles of hockey  = 0.0814moles

Unknown:

Number of pucks there = ?

Solution:

A mole of a substance is made up of Avogadro's number of particles.

Therefore;

       1 mole of hockey pucks will contain 6.02 x 10²³ hockey pucks

       0.0814 mole of hockey pucks will contain :

                              0.0814 x 6.02 x 10²³ = 4.9 x 10²²hockey pucks

Answer: 1. The mole ratio between Zn and ZnCl2 is 1:1. Therefore, if 5.00 moles of Zn react, 5.00 moles of ZnCl2 would be produced.

2. The mole ratio between Zn and HCl is 1:2. Therefore, if 5.00 moles of Zn react, 10.0 moles of HCl would be reacted.

Answer:

5.00 moles of ZnCl2 are produced.

10.00 moles of HCl are reacted.

Explanation:

The balanced chemical equation tells us that 1 mole of Zn reacts with 2 moles of HCl to produce 1 mole of ZnCl2. Therefore, if 5.00 moles of Zn are completely reacted, the same amount of moles of ZnCl2 will be produced, which is also 5.00 moles.

According to the balanced chemical equation, 1 mole of Zn reacts with 2 moles of HCl. Therefore, to react 5.00 moles of Zn, we would need 2 moles of HCl for each mole of Zn. Since we have 5.00 moles of Zn, we would need 2 moles of HCl for each mole of Zn, which totals to 10.00 moles of HCl. So, 10.00 moles of HCl would be reacted.

A magnesium ion, Mg2+, has correct answer is option E) 12 protons and 14 electrons.

The correct answer is option E) 12 protons and 14 electrons. This is because the atomic number of magnesium, which is the number of protons in its nucleus, is 12. When it loses two electrons to become an ion, it still has 12 protons but now only 10 electrons. Therefore, the charge on the ion is 2+ (written as Mg2+). Options A, B, C, and D have incorrect numbers of protons and electrons for a magnesium ion.

Mg2+, an ion of magnesium, contains 12 protons and 14 electrons. This is so because magnesium has 12 protons, or its atomic number, in its nucleus. It still has 12 protons but only 10 electrons when it loses two electrons to become an ion. As a result, the ion has a 2+ charge, represented by the symbol Mg2+. For a magnesium ion, the protons and electrons in Options A, B, C, and D are in the wrong proportions.

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Answer:

usually the perfumes are made of aromatic hydrocarbons invloving

cetone, ethanol, benzaldehyde, formaldehyde, limonene, methylene chloride, camphor, ethyl acetate, linalool and benzyl alcohol. which have density lower than the water hence they will float on the top of the water.

Hope this helps you

Explanation:

Answer: Lactate!

Explanation:Hope this helps!!!

Answer:

It allows ethene molecules to join together to form a single product , so it is an example of an addition reaction . Poly(ethene) is an addition polymer .

The difference in binding energy per nucleon between 23/11 Na and 23/12 Mg can be calculated by finding the total binding energy for each isobar and dividing it by the respective number of nucleons.

To calculate the difference in binding energy per nucleon between the isobars 23/11 Na and 23/12 Mg, we need to find the total binding energy for each isobar and then divide it by the respective number of nucleons.

The atomic mass of 23/11 Na is 23, which means it has 23 nucleons (protons and neutrons). The atomic number is 11, indicating it has 11 protons.

The atomic mass of 23/12 Mg is also 23, so it has 23 nucleons. However, the atomic number is 12, indicating it has 12 protons.

We can use the equation:

Binding Energy per Nucleon = (Total Binding Energy) / (Number of Nucleons)

To find the total binding energy, we can consult a table or use an approximate average value. Let's assume the average binding energy per nucleon for both elements is 8.5 MeV (million electron volts).

For 23/11 Na:

Binding Energy per Nucleon = (Total Binding Energy of Na) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

For 23/12 Mg:

Binding Energy per Nucleon = (Total Binding Energy of Mg) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

The difference in binding energy per nucleon can then be calculated by subtracting the value for Na from the value for Mg.

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Answer:

radians

Explanation:

Answer:

Meters per second.

Explanation:

Ap3x approved

Answer:

It kinda helps but not  really

Thanks for trying anyway doe!

Explanation:

Biomagnification occurs as a result of the buildup of toxins in living organisms in a food chain.

Mutagens are agents that cause mutation whereas teragens are agents that cause cancer.

Biomagnification is the buildup of toxins in living organisms in a food chain.

For example, a human who eats fish from a toxic water body will have a build up of toxins from the fish as well as from the water body.

Build up of chemicals in the environment lead to pollution.

This can be reduced by proper water disposal methods.

Mutagens are agents that cause mutation whereas teragens  are agents that cause cancer. Examples are ionizing radiation and certain chemicals.

Toxins affects people, animals, or the environment differently because of the difference in the genetic makeup of the organisms as well as the biotic and abiotic factors in the environment.

An example of an environment activist is Greta Thurnberg, who as brought to fore the issue of climate change due to human activities such as environmental pollution.

In conclusion, environmental pollution leads to adverse effects in people, animals and the environment.

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Biomagnification occurs as a result of the buildup of toxins in living organisms in a food chain.

Mutagens are agents that cause mutation whereas teragens are agents that cause cancer.

What is biomagnification?

Biomagnification is the buildup of toxins in living organisms in a food chain.

For example, a human who eats fish from a toxic water body will have a build up of toxins from the fish as well as from the water body.

Build up of chemicals in the environment lead to pollution.

This can be reduced by proper water disposal methods.

What are mutagen and teragens?

Mutagens are agents that cause mutation whereas teragens  are agents that cause cancer. Examples are ionizing radiation and certain chemicals.

Toxins affects people, animals, or the environment differently because of the difference in the genetic makeup of the organisms as well as the biotic and abiotic factors in the environment.

An example of an environment activist is Greta Thurnberg, who as brought to fore the issue of climate change due to human activities such as environmental pollution.

In conclusion, environmental pollution leads to adverse effects in people, animals and the environment.

This is not the best way to organize a periodic table because two elements might have similar atomic mass.

Periodic table is a chart in which arrangement of chemical elements are done.

In the early periodic table elements are arranged on the basis of their atomic masses, while after sometime Moseley arranged the periodic table on the basis of atomic number as he proposed that properties of an element is justified on the basis of number if electrons.

And mass of two substances may be same so it is difficult to differentiate between them.

Hence, two elements might have similar atomic mass.

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Based on the measured intensity of radiation from carbon-14 in the ancient piece of wood being 6% of what it would be in a freshly cut piece of wood, the artifact is estimated to be approximately 22,920 years old.

Carbon-14 dating is a method used to determine the age of organic materials by measuring the decay of the radioactive isotope carbon-14. Carbon-14 is created in the Earth's atmosphere and is absorbed by plants during photosynthesis. When the plants die, the intake of carbon-14 stops, and the existing carbon-14 starts to decay at a predictable rate. By comparing the ratio of carbon-14 to carbon-12 in a sample with the ratio found in living organisms, scientists can estimate the age of the sample.

The half-life of carbon-14 is about 5,730 years, which means that after this time, half of the carbon-14 in a sample will have decayed. By calculating the percentage of remaining carbon-14, we can determine the age of the artifact. In this case, since the intensity of radiation is 6% of what it would be in a freshly cut piece of wood, we can infer that approximately 94% of the carbon-14 has decayed. Using the half-life of carbon-14, it can be estimated that 22,920 years have passed since the wood was alive.

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Answer:

5

Explanation:

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The missing component of the reaction is Chlorine gas (Cl₂).

Fastest way to predict the missing component is to balance the chemical equation by ensuring that the number of atoms on both sides of the equation is the same.

? + 2NaBr → 2NaCl + Br₂

The reactant "?" should be chlorine gas (Cl2). This is because when chlorine gas reacts with sodium bromide (NaBr), it displaces bromine to form sodium chloride (NaCl) and bromine gas (Br2).

The balanced equation will therefore be:

Cl₂ + 2NaBr → 2NaCl + Br₂

So, the missing components are: Cl₂

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This titration involves adding 50.00 ml of 0.125 M HBr (strong acid) to 0.200 M NaOH. (strong base). The Correct option is A

When the amount of acid added equals the amount of base added, the equivalence point is reached. According to the reaction's stoichiometry, this happens when 31.25 ml of NaOH have been added.

We use the fact that HBr is a strong acid, which implies that it totally dissociates in water to create H+ ions and Br- ions, to determine the pH at different volumes of NaOH supplied. Only the HBr is present at 0.00 ml of NaOH applied, hence the pH may be determined using the initial concentration of H+. We must use the amount of HBr that hasn't been completely neutralised after 10.0 ml of NaOH have been introduced in order to determine the concentration of H+ ions.

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