1pt The step by step method scientists use to solve problems and test ideas is
O A. The Scientific Method
B. The Report
c. The Research
O D. Learning Objectives

We use the formula to determine how much heat is needed to warm a substance: m * c * deltaT = q

where q represents the amount of heat in calories, m represents the substance's mass in grammes, c represents its specific heat in calories per gram-degree Celsius, and deltaT represents the temperature change in degrees Celsius.

In this instance, we get:

m = 89.7 g

Initial temperature (which is not supplied to us) - deltaT = 44.1 °C

The specific heat of water is 1 calorie/gram-degree Celsius, albeit c changes depending on the item being heated.

As a result, by applying the formula, we can determine how much heat is needed to warm the substance:

q = (44.1 °C - starting temperature) * (1 calorie/gram-degree Celsius) * (89.7 g)

Without having knowledge of the initial temperature, we cannot fully answer the equation. On the basis of the equation, we can make certain observations, though.

A substance's bulk and the temperature change have a direct relationship with the quantity of heat needed to warm it. This implies that the quantity of heat needed to warm the substance grows as either of these variables increases.

In addition, compared to other materials, water has a comparatively high specific heat, which means that in contrast to other materials, a relatively big quantity of heat is required to raise the temperature of water by a given amount.

In conclusion, without knowledge of the initial temperature, we are unable to calculate the required amount of heat. The specific heat of water is quite high, however the amount of heat needed will depend on the mass of the substance and the temperature change.

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The electronic configuration of organic compounds depends on the orbitals of their atoms and molecules.

The expression 'electronic configuration' makes reference to the spacial arrangement of electrons in distinct energy orbitals of an atom/molecule.

The orbitals are designed with numbers and letters, whereas the amount of electrons in each orbital is expressed as superscripts (e.g., 1s² 2s² 2p² in the C atom that form glucose).

In conclusion, electronic configuration of organic compounds depends on the orbitals of their atoms and molecules.

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Answer:So, when a reactant gets used up, its concentration decreases, and so the total reaction rate decreases. As you can see here, more products equal less reagents (reactants), and so the reaction rate decreases.

Explanation: i hope this helps!! :)))

The oxidation number of reactant Fe is 0 while the  oxidation number of iron in the product is +3

The term redox reaction implies a reaction in which there is an increase in the oxidation number of a specie and the decrease in the oxidation number of another specie.

Now we have the answers as follows;

1) The oxidation number of reactant Fe is 0

2) The oxidation number of reactant oxygen is 0

3) The oxidation number of iron in the product is +3

4) The oxidation number of oxygen in the product is -2

5). Iron is oxidized in the reaction

6) Oxygen is reduced in the reaction

7) The oxidizing agent in this case is the oxygen atom

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The layers of the atmosphere with the boundaries that are between them are shown in the image attached here.

The troposphere, which rises up to an altitude of roughly 10-15 km, is the layer that is closest to the Earth's surface. The majority of the Earth's air mass is contained here, which is also where weather happens.

The tropopause marks the transition from the troposphere to the stratosphere, the next layer. It designates the altitude at which the temperature stops dropping.

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Answer:

Explanation:

Since 1 gram of radium decays to 1/2 gram in 1622 years that means the half-life of radium is 1622 years.

So,  6 grams also decay to 3 grams in 1622years

Answer:100

Explanation:

The engineer's suggestion will not work because according to the Le Chatelier's Principle, the reaction will be favored in the condition that if lower the temperature.

The reaction is as :

N₂(g) + 3 H₂(g)   ⇄  2 NH₃(g) + heat

The forward reaction is the exothermic reaction. According to the Le Chatelier's Principle, the reaction will be favored in the condition that if lower the temperature. At the very low temperature it will create the reaction that is to occur at the very slowly and therefore, it is not the efficient.

At the low temperature and the high pressure the reaction favored the forward reaction.

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Answer:

Plastic is better because it doesn't melt in the microwave but aluminum burns in the microwave

Explanation:

The molarity of vinegar is 0.47368421 moles per liter.

To calculate this, we can use the following formula:

molarity = (initial_volume - total_volume_change) / final_volume

In this case, the initial volume is 7.5 mL, the total volume change is 21 mL, and the final volume is 28.5 mL. Plugging these values into the formula, we get:

molarity = (7.5 - 21) / 28.5 = -0.47368421

The negative value for molarity indicates that the solution is diluted. This is because the total volume of the solution increased by 21 mL, while the amount of solute (acetic acid) remained the same.

It is important to note that the molarity of a solution can change depending on the temperature. This is because the volume of a solution expands as it gets warmer. Therefore, it is important to measure the volume and temperature of a solution at the same time to get an accurate measurement of its molarity.

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Answer:

180-115-31=34

Table salt does not melt on the stove, it dissolves in water and does not conduct electricity.

There are several substances listed in the table Epsom salt is another one of these substances. It does not melt on a stove, it dissolves in water and also conducts electricity.

Finally, potassium chloride does not melt on the stove, it dissolves in water and it does conduct electricity. These are the experiences one can have with these common substances.

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Answer:

D

Explanation:

We have that the volume in cm^3 is mathematically given as

v=9.7759cm^3

Question Parameters

Volume, in this context  is a function of density and mass of the object.

Generally the equation for the  Density is mathematically given as

\(\phi=m/v\)

Therefore

\(\\\ v=m/\phi\\\\v=69.8/7.14\\\\\)

v=9.7759cm^3

Hence, the calculated volume is

v=9.7759cm^3

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When 32.0 g of F₂ react with enough N₂, 39.86g of NF₃ are formed.

Stoichiometry is the study of the quantitative relationships or ratios between two or more substances undergoing a physical change or chemical change.

Let's consider the following balanced equation.

N₂ + 3 F₂ ⇒ 2 NF₃

To calculate the mass of NF₃ formed from 32.0 g of F₂, we need to consider the following relationships.

\(32.00gF_2 \frac{1molF_2}{38.00gF_2} \frac{2molNF_3}{3molF_2} \frac{71.00gNF_3}{1molNF_3} = 39.86gNF_3\)

When 32.0 g of F₂ react with enough N₂, 39.86g of NF₃ are formed.

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The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer:

Renewable sources are something that can be renewed like
Plants
Trees
etc
uh

Explanation:

Non-renewable for example is you cant renew them at all
there built by the earth themselfs
Like
cole
gemstone
Steel

Metal
etc

How to pay taxes I MEAN

Answer:

A plastic ball

Explanation:

A plastic ball has less density than water because plastic has low density so

The above given statement is true.

A common fuel for lighters, torches, and camping stoves is butane, an odorless, colorless, and combustible gas. It belongs to the family of hydrocarbons known as alkanes, which exclusively contains carbon and hydrogen atoms in single-bond relationships.

A little amount of butane is discharged from the pressurized canister and combined with air when the lighter's button is depressed. As a result of the butane's vaporization caused by the heat of the lighter's flame combining with airborne oxygen to undergo combustion, carbon dioxide and water vapor are produced as byproducts.

The following is a representation of the chemical equation for butane combustion:

C4H10 + 13/202 = 4CO2 + 5H2O

Four molecules of butane and thirteen molecules of oxygen combine in this process to form four molecules of carbon dioxide and five molecules of water vapor. The reaction's heat and light are what enable the lighter's flame to burn continuously until the fuel supply runs out.

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Answer:

H3PO4 (phosphoric acid) is weak acid

Explanation:

This is because weak acid is an acid that ionizes only slightly in an aqueous solution.

The amount of heat energy required required to convert 72.0 g

of ice at − 18° C to water at 25° C is 31.9 kJ.

To calculate the amount of heat energy required to convert 72.0 g of ice at −18.0°C to water at 25.0°C, we need to consider two separate processes: first, the energy required to melt the ice (i.e., to convert it from a solid to a liquid), and second, the energy required to heat the liquid water from its initial temperature of 0°C to its final temperature of 25°C.

The energy required to melt the ice can be calculated using the formula:

\(Q1 = m × ΔH_fus\)

where Q1 is the heat energy required (in joules), m is the mass of the ice (72.0 g), and\(ΔH_fus\)is the heat of fusion of water (334 J/g).

Q1 = 72.0 g × 334 J/g = 24,048 J = 24.05 kJ

The energy required to heat the liquid water from 0°C to 25°C can be calculated using the formula:

\(Q2 = m × C × ΔT\)

where Q2 is the heat energy required (in joules), m is the mass of the water (also 72.0 g), C is the specific heat capacity of water (4.184 J/g°C), and ΔT is the change in temperature (25°C - 0°C = 25°C).

Q2 = 72.0 g × 4.184 J/g°C × 25°C = 7,845.6 J = 7.85 kJ

Therefore, the total heat energy required to convert 72.0 g of ice at −18.0°C to water at 25.0°C is:

\(Q_total = Q1 + Q2\) = 24.05 kJ + 7.85 kJ = 31.9 kJ

Therefore, the amount of heat energy required is 31.9 kJ.

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The concentration of Helium gas in the solution is 1.5 parts per million (ppm).

First, we need to convert the mass of helium gas to grams:

3.0 x 10⁻⁴g = 0.0003g

Next, we need to find the total mass of the solution:

Total mass of solution = mass of solvent + mass of solute

Since Helium gas is dissolved in the solvent, we can assume that its mass is negligible compared to the mass of the solvent. Therefore, we can use the mass of the solvent (200 g) as the total mass of the solution.

Now we can calculate the concentration of helium gas in ppm:

Concentration (in ppm) = (mass of solute / total mass of solution) x 10^6

Concentration = (0.0003 g / 200 g) x 10^6

Concentration = 1.5 ppm

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Scaling a life-size crime scene onto a sketch paper involves reducing the dimensions of the scene while maintaining accurate proportions.

Here's an example of how to do it:

Measure the dimensions of the crime scene (e.g., length and width) using a tape measure.

Determine the desired scale for the sketch (e.g., 1 inch represents 1 foot).

Calculate the reduction factor by dividing the length of the crime scene by the length on the sketch paper. For example, if the crime scene length is 30 feet and the sketch length is 10 inches (120 inches), the reduction factor would be 30/120 = 0.25.

Multiply all measurements of the crime scene (length, width, objects, distances) by the reduction factor to obtain the corresponding measurements for the sketch.

Transfer the scaled measurements onto the sketch paper using a ruler and appropriate drawing tools.

Citation: The procedure described above is a commonly used method for scaling objects or scenes in forensic science investigations. It is based on principles of measurement and proportion commonly employed in the field. No specific citation is provided since this is a widely used technique in forensic science practice.

Therefore, scaling a life-size crime scene onto a sketch paper involves reducing the dimensions of the scene while maintaining accurate proportions.

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The volume of carbon dioxide gas produced at normal conditions is 59.36 L

A mole is defined as the number of gas molecules present in 22.4L of gas at STP.

The relation between volume and mole is given as :

1 mole = 22.4 L

Volume is expressed in terms of liters(L)

According to the given question,

Moles of carbon dioxide produced after burning a piece of wood = 2.65 moles.

Using the relation, 1 mole = 22.4L

1 mole of carbon dioxide = 22.4L

2.65 moles of carbon dioxide = 22.4 x 2.65 L

2.65 moles of carbon dioxide = 59.36 L

The volume of carbon dioxide gas produced at normal conditions  after burning a piece of wood is 59.36 L

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Answer:

By measuring out 3.9 grams of cobalt (II) chloride up to a volume of 1.0 L of solution.

Explanation:

Hello there!

In this case, considering this question about molarity, it turns out possible for us to calculate the required mass of cobalt (II) chloride by firstly compute the moles present in 1.0L of the given 0.03-M solution:

\(M=\frac{n}{V} \\n=V*M\\\\n=1.0L*0.03\frac{molCoCl_2}{L}\\\\n=0.03molCoCl_2\)

Next, since the molar mass of cobalt (II) chloride is 129.84 g/mol, we compute the grams we need to measure out in order to prepare this solution:

\(m_{CoCl_2}=0.03molCoCl_2*\frac{129.84gCoCl_2}{1molCoCl_2} \\\\m_{CoCl_2}=3.9gCoCl_2\)

Regards!

Answer:

increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object would make the oppositely charged objects attract each other more.

The evidence from the article highlights these practices as effective means of improving water quality. By implementing these measures, both individuals and governmental agencies can contribute to the preservation and protection of water resources.

According to the article, there are several practices that members of the public and governmental agencies can adopt to improve water quality:

Implementing proper wastewater management: This involves treating wastewater before it is released back into the environment. The article emphasizes the importance of implementing advanced treatment technologies to remove pollutants effectively.Promoting sustainable agriculture: The article highlights the significance of adopting practices that minimize the use of fertilizers and pesticides, such as precision agriculture techniques. These practices can reduce the runoff of agricultural chemicals into water bodies.Establishing buffer zones: Creating vegetated buffer zones along rivers, lakes, and streams can help filter and absorb pollutants, preventing them from entering the water bodies. The article suggests that buffer zones should be implemented to reduce sediment, nutrient, and pesticide runoff from adjacent fields.Encouraging responsible industrial practices: The article emphasizes the need for industries to adopt eco-friendly practices, including proper disposal of industrial waste and the use of environmentally friendly production techniques.

Raising awareness and education: Public education campaigns can play a crucial role in improving water quality. The article suggests that educating the public about the impact of their actions on water bodies and providing information on sustainable practices can lead to positive changes.

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Answer:

Primary

Explanation:

Succession is a series of progressive changes in the composition of an ecological community over time. In primary succession, newly exposed or newly formed rock is colonized by living things for the first time.

Answer:

B, 2NO + O2 --> 2NO2

Explanation:

The exponents in the rate law for an elementary step are equal to the stoichiometric coefficients of the particles in the equation for the elementary step. Therefore, the elementary reaction must be between two NO molecules and one O2 molecule.

The elementary reaction of the three-body molecular collision is 2NO + O2 -----> 2NO2

The rate of reaction refers to how fast or slow a reaction occurs. The rate equation for an elementary reaction involves the concentration of the species raised to the power of their respective molar coefficients.

We are told that the rate law of the reaction is given as; Rate = k[NO]^2 [O2]. This implies that the single elementary step that is a three-body molecular collision, is represented by the equation; 2NO + O2 -----> 2NO2.

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There are numerous ways to determine whether lead is present in an ore. Atomic absorption spectroscopy is a popular approach. With this method, an ore sample is dissolved in acid and then atomized in a flame or plasma.

The sample's atoms will absorb light at particular wavelengths that are peculiar to the element under investigation. The amount of light absorbed can be used to calculate how much lead is present in the sample. Inductively coupled plasma mass spectrometry and X-ray fluorescence spectroscopy are further techniques. It is crucial to remember that these procedures call for specialized tools and training, thus they ought to only be carried out in a lab by qualified experts.

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