In conclusion, write down at least two pieces of evidence showing that Earth’s atmospheres or oceans have changed over time. Provide reasoning for each piece of evidence.

Answer:

Astronomers identify numerous types of dwarf galaxies based on their shape and composition.

Explanation:

Answer:

A. prefixed with the letter "d"

Explanation:

B. All atoms of silver have the same atomic number but different numbers of neutrons in the nucleus.

Answer:a substance made by mixing other substances together.

Explanation:trust me

Answer:

The Answer will be provided below, please pay attention in class next time so that you don't have to be in a hurry like you are in now.

Explanation: The correct option is:

Both fossil fuels and wind energy can be used to produce electricity. However, burning fossil fuels does pollute the atmosphere, while using Earth's wind does not. Both fossil fuels and wind energy contribute to climate change, but the use of fossil fuels is much more damaging to the environment than the use of wind power.

Fossil fuels are non-renewable sources of energy that are formed over millions of years by the decomposition of organic matter. They release harmful greenhouse gases when burned, contributing to climate change. In contrast, wind energy is a renewable source of energy that uses turbines to harvest the power of wind. Wind energy does not produce any emissions, making it an environmentally friendly alternative to fossil fuels. While wind turbines can have some impacts on wildlife and habitats, the impact is much less severe than the effects of fossil fuel extraction and burning.

Added Part: Fossil fuels are non-renewable sources of energy that are derived from the remains of plants and animals that died millions of years ago. These sources include coal, oil, and natural gas. Wind energy, on the other hand, is a renewable source of energy that is generated by the kinetic energy of wind.

Here are some comparisons between fossil fuels and wind energy:

Environmental Impact: Fossil fuels have a significant negative impact on the environment. Burning fossil fuels produces greenhouse gases that contribute to climate change. The extraction of fossil fuels also has negative impacts on the air, water, and soil. Wind energy, however, has a very small environmental footprint. Wind turbines do not produce any emissions and do not require any water to generate electricity.

Energy Availability: Fossil fuels are abundant and have been the primary source of energy for decades. On the other hand, wind energy is a relatively new source of energy and the technology is still developing. However, the availability of wind energy is significant, as wind is a renewable source that is constantly available.

Sustainability: Fossil fuels are non-renewable, which means they will eventually run out. As the demand for energy continues to increase, the availability of fossil fuels will decrease. Wind energy is a renewable source of energy that will never run out.

Here are some pros and cons of both fossil fuels and wind energy:

Fossil Fuels:

Pros:

Reliable source of energy

High energy density

Large global infrastructure

Cons:

Non-renewable source of energy

Significant environmental impact

Price instability

Wind Energy:

Pros:

Renewable source of energy

Small environmental footprint

Low operating costs

Cons:

High initial costs for building wind turbines

Wind is an inconsistent source of energy

Can create noise pollution for surrounding communities

Answer:

\(t=82.2s\)

Explanation:

From the question we are told that:

Half life \(t_{1/2}=54.3s\)

Change in concentration \(\triangle conc=6.50 M to 2.27 M\)

Generally the equation for half life is mathematically given by

\(k=\frac{2.303}{t}*log\frac{C_1}{C_2}\)

Where

\(K=\frac{0.693}{t_{1/2}}\)

\(K=\frac{0.693}{54.3}\)

\(K=0.0128\)

Therefore

\(0.0128=\frac{2.303}{t}*log\frac{6.50}{2.27}\)

\(t=82.2s\)

Answer:

Science is:

objective

based on fact

must be ethical

Explanation:

Science is considered to be objective because it is based on empirical evidence and systematic observation, and it strives to eliminate personal bias and opinions from the scientific process. Science is based on fact, as it relies on repeatable and verifiable experiments to test hypotheses and theories. And, it is important for science to be ethical because the scientific community has a responsibility to ensure that research is conducted in an ethical and responsible manner, and that the results are reported accurately and honestly.

Answer:

vibration of particles...........

Answer:

98.08 g/mol

Explanation:

Hope this helps.

The possible masses of calcium oxide and carbon dioxide that can form when 400g of calcium carbonate undergoes decomposition is

The correct measurement of the element neon (Ne):

When reactants of a reaction are known, the fact that can always be deduced about the products is:

The correct molar mass correct for carbon dioxide (CO₂) is 44.01 g/mol; option B

The number of moles in 43 g of CO₂ is 0,977 moles.

According to the law of conservation of matter, the statement that best describes a balanced chemical equation:

The number of moles of atoms of each element must be the same in the reactants and in the products.

Based on the law of conservation of mass, the product of the reaction of nitrogen gas and hydrogen is 2 NH₃.

To calculate the number of moles from mass, take the quotient of mass and molar mass; option B

The ratio of components in the reaction of sugar with oxygen gas to produce carbon dioxide and water is:

For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed; option A

The molar mass of NH₄Cl is 53.5 g/mol; option A.

The decomposition of 1 mole of calcium carbonate yields 1 mole of CaO and 1 mole of CO₂ as shown in the equation below:

CaCO₃ ---> CaO + CO₂.

Molar mass of CaCO₃ is 100 g.

400 g of CaCO₃ is equal to 4 moles

4 moles of CaCO₃ produces 4 moles of CaO and CO₂

Mass of 4 moles of CaO = 4 * 56 = 224 g

Mass of 4 moles of CO₂ = 4 * 44 176 g

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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This question is incomplete, the complete question is;

The number density of conduction electrons in pure silicon at room temperature is about 10¹⁶ m⁻³. By doping with phosphorous, you desire to increase this number by a factor of 1 million (10⁶). At room temperature, assume that the thermal energy is sufficient that all of the extra electrons from the P doping enter the conduction band. What fraction of silicon atoms must you replace with phosphorous atoms

Answer:

the  fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶  - 1 )

Explanation:

Given that;  

the number density no =  10¹⁶ m⁻³

Required no =  (10¹⁶ × 10⁶) = 10²² m⁻³

Each silicon atom has 4 valence electron,

Hence; Silicon density =  10¹⁶/4

now, if x = No of silicon atoms to be replaced with phosphorous, then;

(10¹⁶/4 - x)4 + 5x = 10²²

10¹⁶ - 4x + 5x = 10²²

10¹⁶ + x = 10²²

x = 10²² - 10¹⁶

Fraction of silicon atoms will be;

⇒ 10²² - 10¹⁶ / 10¹⁶/4

⇒ 4( 10²² - 10¹⁶ / 10¹⁶ )

⇒ 4( 10²²/10¹⁶  - 10¹⁶/10¹⁶ )

⇒ 4( 10⁶  - 1 )

Therefore, the  fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶  - 1 )

The final temperature of the copper would be 30.26°C if it absorbed 150 J of heat.

To solve this problem, we can use the formula:

q = m * C * deltaT

where q is the heat absorbed by the copper, m is the mass of the copper, C is the heat capacity of copper, and deltaT is the change in temperature.

Rearranging the formula, we get:

deltaT = q / (m * C)

Substituting the given values, we get:

deltaT = 150 J / (75 g * 0.38 J/g°C) = 5.26 °C

Therefore, the final temperature of the copper will be:

25.0°C + 5.26°C = 30.26 °C

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Answer:

The most abundant isotope is ⁴⁰Ca and the least abundant is ⁴⁶Ca

Explanation:

The mass, in percentage, of eah isotope of Calcium is their fractional composition multiplied by 100:

40Ca-0.96941*100 =  96.941% of ⁴⁰Ca

42Ca-0.00647*100 = 0.647% of ⁴²Ca

43Ca-0.0013*100 = 0.13% of ⁴³Ca

44Ca-0.02086*100 = 2.086% ⁴⁴Ca

46Ca-0.00004*100 = 0.004% ⁴⁶Ca

48Ca-0.00187*100 = 0.187% of ⁴⁸Ca

That means the most abundant isotope is ⁴⁰Ca and the least abundant is ⁴⁶Ca

There is no reaction between zinc II sulfate and magnesium sulfate.

We know that a reaction is said to occur when two species are combined and there are new products that appear in the system. This implies that if there are no new substances that appear in the system we can not say that a chemical reaction has taken place.

In this case, we can see that we can not be able to observe any change when wee mix a solution of magnesium sulfate and zinc II sulfate since the both of them have the same anion.

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

Explanation:

It’s a Gases can change volume , and liquids can not

Answer:

A. Gases can change volume, liquids cannot

Explanation:

I just took the quiz!

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

Explanation:

scheelite is CaWO₄

Mol weight = 288

80 g of scheelite = 80 / 288 = 27.77 x 10⁻² moles

27.77 x 10⁻² moles of scheelite = 27.77 x 10⁻² x 6.02 x 10²³  molecules of scheelite

= 167.17 x 10²¹ molecules of scheelite

1 molecule of scheelite contains 4 atoms of oxygen

167.77 x 10²¹ molecules of scheelite contains 4 x 167.77 x 10²¹ atoms of oxygen .

= 671.08 x 10²¹ atoms of oxygen .

= 671 x 10²¹ atoms .

Answer:

Explanation:

The elements in Group 1A elements are Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium(radioactive). The valence shells of the members have the electronic configuration of ns¹ where n =2,3,4,5,6,7. They are known as alkali earth metals. Their chemistry is dominated by the only electron in the outer shell of their atoms. Thus, they are powerful reducing agents because of their ability to lose this outer shell electron readily.

Thus ns' electrons in Group 1A require lesser energy for ionization in the case of elements of Group 1A; this explains why Group 1A elements are more reactive.

On the other hand, the Group 1B elements outer ns' electrons are less effectively shielded by the inner d electrons; therefore, the outer electrons in case of Group 1B feel more nuclear pull (due to positively charged protons in the nucleus) as compared to the nuclear pull in Group 1A elements. Thus electrons require more energy for ionization in the case of elements of Group 1B. This explains why Group 1B elements are less reactive than elements of Group 1A.

Explanation:

Ionic bonds are special interatomic or intramolecular forces of attraction within a compound.

Answer:

Explanation:

Endothermic reactions are reactions that absorbs heat energy from the environment or surroundings

They are direct opposites of exothermic reactions in that their reaction vessels might feel cool to the touch

They generally have a reduced amount of heat compared to the environment at that point in time

Note that the above prompt on Ecology draws it's analysis form a well known story which have been told visually called "The Lion King".

The answers are:

1) Biotic Factors, simply put are living things

2 examples of things from Lion King Introduction are:

3) Abiotic factors are Non -living things.

4) Examples from the introduction are:

5) the symbiotic relationship is called: commensalism.

Long-term biological interactions known as commensalism occur when individuals of one species benefit while those of the other species suffer neither advantages nor harm.

Ecology which is the study of the environment, allows  a person  to comprehend how different types of creatures coexist in various kinds of physical settings.

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Full Question:

Although part of your question is missing, you might be referring to this full question:

1) What is Biotic Factors

2) List three biotic factors from the Lion King introduction

3) What is Abiotic factors?

4) List three Abiotic factors from the Lion King introduction

5) The bird riding on the tusks of the elephant feed on insects the elephant stirs up. What kind of symbiotic relationship exists between the two?

The balanced chemical equation is 2Pb(NO3)2 + 2KI 2KNO3 + PbI2 for the reaction between lead(II) nitrate and potassium iodide. Since lead(II) nitrate has a coefficient of 2, the equation must be balanced by adding 2 moles of lead(II) nitrate for every mole of potassium iodide.

The atom inventory technique, which counts the number of atoms of each element on both sides of the equation, can be used to ascertain this. For the equation to be balanced, the number of atoms on both sides must be equal.

In this instance, there are 4 atoms total—2 on each side of the nitrate molecule, 2 on each side of the potassium molecule, 1 on each side of the lead atom, and 2 on each side of the iodine molecule.

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[1]pb(no3)2+[1]Na2CrO4

[1]PbCrO4+[2]NaNO3

Both changing particle size and adding a catalyst can influence the reaction rate, while adding heat specifically affects the rate by increasing the kinetic energy of the reactant particles.

The correct option are A and C.

Both changing particle size and adding a catalyst can alter the reaction rate.

Changing particle size can affect the reaction rate because it influences the surface area available for the reactant particles to interact. Smaller particle sizes result in a larger surface area, increasing the frequency of collisions between particles and accelerating the reaction. Conversely, larger particle sizes reduce the surface area, leading to fewer collision events and slower reaction rates.

Adding heat can also alter the reaction rate. Increasing the temperature provides more thermal energy to the reactant particles, causing them to move faster and collide with greater energy. This enhanced kinetic energy leads to more successful collisions and an increased reaction rate.

Adding a catalyst can significantly affect the reaction rate. A catalyst provides an alternative reaction pathway with lower activation energy, enabling the reaction to occur more easily. By lowering the energy barrier, a catalyst increases the rate of reaction without being consumed or permanently altered in the process.

The correct option are A and C.

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Answer: The pressure is 1137.5 mm Hg its pressure if its volume is increased to 150 \(cm^{3}\) at 35 °C

Explanation:

Given: \(P_{1}\) = 750 mm Hg,    \(V_{1} = 130 cm^{3}\),     \(T_{1} = 20^{o}C\)

\(P_{2}\) = ?,          \(V_{2} = 150 cm^{3}\),            \(T_{2} = 35^{o}C\)

Formula used to calculate the new pressure is as follows.

\(\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\)

Substitute the values into above formula as follows.

\(\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{750 mm Hg \times 130 cm^{3}}{20^{o}C} = \frac{P_{2} \times 150 cm^{3}}{35^{o}C}\\P_{2} = 1137.5 mm Hg\)

Thus, we can conclude that the pressure is 1137.5 mm Hg its pressure if its volume is increased to 150 \(cm^{3}\) at 35 °C.

Answer:

\(\Delta H=1149.5J\)

Explanation:

Hello!

In this case, since the calorimeter contains a solution for which the specific heat is 4.18 J/g°C, which is equal to that of the water, we can also notice that the density is 1.00 g/mL and therefore the present mass is 250 g. In such a way, we compute the enthalpy change as shown below:

\(\Delta H=mC\Delta T\)

Thus, by plugging in the mass, specific heat and temperature change, we obtain:

\(\Delta H=250g*4.18\frac{J}{g\°C}(26.1\°C-25.0\°C)\\\\\Delta H=1149.5J\)

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Answer: B- Weak base.

Explanation:

Answer:

Weak bases is your answer

Explanation:

This angle is greater than the right angle. The correct option is A.

The right angle is created when two straight lines cross at a 90° angle, or when they are perpendicular at the intersection. The symbol ∟ represents a right angle.

Look at this angle in the picture. This angle is greater than a right angle. The right angle is 90 degrees, and the angle is greater than the right angle. The angle can be 95 degrees.

Therefore, the correct option is A. greater than a right angle. A right angle looks like the corner of a square.

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The question is incomplete. Your most probably complete question is given below:

A. greater than a right angle

B equal to a right angle

C less than a right angle

Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.

Thus, They are additionally known as limiting reactants or limiting agents. A predetermined quantity of reactants are necessary for the reaction to be completed, according to the stoichiometry of chemical reactions.

In the aforementioned reaction, 2 moles of ammonia are created when 3 moles of hydrogen gas react with 1 mole of nitrogen gas.

In most cases, this reactant dictates when the reaction will end. The reaction stoichiometry can be used to determine the precise quantity of reactant that will be required to react with another element. The limiting agent is determined by the mole ratio rather than the mass of the reactants.

Thus, Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.

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