When plants began to evolve, oxygen levels in the atmosphere __________, which allowed animals to evolve. Which word completes the sentence? Increase, decrease or stays the same ??

Based on the types of reactions, the types of reactions from the given analogies are:

Analogy 1: Analogy 1 describes a decomposition reaction in which a single reactant breaks down into two more products

Analogy 2: Analogy 2 describes a single diplacement reaction in which one of the compound displaces a radical from another compound.

Analogy 3: Analogy 3 is a synthesis reaction in which two or more substances combine to form a single product.

Analogy 4: Analogy 4 is a double displacement reaction in which two substance exchange their radicals.

In conclusion, the reactions are decomposition, single displacement, synthesis and double displacement reaction.

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Incomplete question. However, I provided a specific example of stewardship of the atmosphere.

Explanation:

First, note that the term stewardship refers to the belief that humans are obligated to take care and look after our environment (which includes the atmosphere.

An example of this is: deciding to change our mode of transportation: What this entails is that we may decide to switch to riding a bicycle to places rather than going by car. By so doing you will be reducing the number of greenhouse gases emitted into the environment as bicycles do not emit harmful gases when used.

Answer:

3m/s²

Explanation:

Force applied to an object can be calculated thus;

F = ma

Where;

F = force applied (Newtons)

m = mass of substance (kg)

a = acceleration (m/s²)

According to the information provided in this question, F = 12.0 newtons, m = 4.0 kg, a = ?

Derived from F = m.a

We have; a = F/m

a = 12/4

a = 3

The resultant acceleration of the object is 3m/s².

Answer:

1. In the beaker, stir 1/2 cup of Epsom salts with 1/2 cup of very hot tap water for at least one minute. ...

2. Add a couple drops of food coloring if you want your crystals to be colored.

3. Put the beaker in the refrigerator.

4. Check on it in a few hours to see a beaker full of epsom salt crystals!

Explanation:

Answer: The molecular mass of carbon dioxide is 44.01amu. The molar mass of any compound is the mass in grams of one mole of that compound. One mole of carbon dioxide molecules has a mass of 44.01g, while one mole of sodium sulfide formula units has a mass of 78.04g. The molar masses are 44.01g/mol and 78.04g/mol respectively.

This structure is correct due to the total number of bonds and electrons

We employ the octet rule, which states that all atoms in a compound are expected to follow, to check the accuracy of any chemical structure. The octet rule is precisely satisfied for each atom in the depicted structure of carbon IV oxide. The valence shell of each atom in the molecule is surrounded by eight electrons. We may thus infer that this structure is accurate given the total number of bonds and electrons since CO2 has sixteen valence electrons.

It possesses a negative charge of 1.602176634 coulombs, the basic unit of electric charge, which is comparable to its negative charge. The rest mass of an electron is 9.1093837015 10^-31 kg, or just 1/1,836 the mass of a proton. An electron is therefore considered to have practically negligible mass in comparison to a proton or neutron, and its matter is not taken into consideration when calculating an atom's mass number.

The question is incomplete, the complete question is found in the image attached to this answer

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The displacement of the spring system when its speed is 15.0 cm/s is 3.75 cm.

The amplitude (A) of a spring system doing simple harmonic motion is the maximum displacement from the equilibrium position. In this case, the amplitude is given as 5.00 cm.

The maximum speed (v_max) occurs when the displacement is zero, and is equal to the amplitude multiplied by the angular frequency (ω) of the motion:

v_max = Aω

We can rearrange this equation to solve for the angular frequency:

ω = v_max / A

The displacement (x) of the spring system at any given time can be expressed as:

x = Acos(ωt)

where t is the time. To find the displacement when the speed is 15.0 cm/s, we need to first find the corresponding time.

At this speed, the velocity is half of the maximum velocity, so we can set:

15.0 cm/s = (1/2)v_max

Solving for v_max gives:

v_max = 30.0 cm/s

So, we have:

ω = v_max / A = (30.0 cm/s) / (5.00 cm) = 6.00 s⁻¹

Now, we can use the equation for displacement to find x when the velocity is 15.0 cm/s:

x = Acos(ωt)

15.0 cm/s = -Aωsin(ωt)

sin(ωt) = -(15.0 cm/s) / (Aω) = -0.50

At this point, we can use a calculator to find the value of the angle (ωt) that gives a sin of -0.50, which is approximately 30°.

Since we know that the displacement is at its maximum when the speed is zero, we can subtract the amplitude multiplied by the cosine of 30° to find the displacement at the given speed:

x = Acos(ωt) - A = (5.00 cm)cos(30°) - (5.00 cm) = 3.75 cm

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Answer:

2.57 e-9

Explanation:

The formula is H3O=10^-Ph

10^-8.59=2.57 e-9

Answer:

It should be A

Explanation:

I hope this helps!

Answer:

B. changes in energy during the reaction

Explanation:

y-axis measures "energy" and x-axis measures "reaction progress". Those units fit well with (B) and not so well with concentration and time (A), phases and temperature (C), or reaction rate and time (D).

Answer:

b. changes in energy during reaction

Explanation:

graph

The ideal bonding angle in SO2 is 119°

The electron domain geometry of SiO2 is tetrahedral

The molecular geometry of SiO2 linear

The electron domain geometry O3 trigonal planar

The molecular geometry of O3 is bent

The formal charges assigned to individual atoms is minimized.

Giving a Lewis structure with reduced formal charges refers to setting up an ion, molecule, or other structure's atoms and electrons in a way that reduces the formal charges each atom is given. To evaluate the distribution of electrons and the stability of the molecule, formal charges are fictitious charges given to the atoms in a Lewis structure.

Positive and negative formal charges should be kept to a minimum in order to give the molecule's electrical distribution a more stable and accurate depiction.

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Answer: its called titin, but it has a much much longer name that i couldn't find in full

Explanation: C169,719H270,466N45,688O52,238S911

1) Convert moles of Br2 to grams

The molar mass of Br2 is 159.81 g/mol.

1 mol of Br2 is equal to 159.81 g Br2.

The acceptable result when testing a catalytic converter with an infrared pyrometer is that both the inlet and outlet should be the same temperature after the converter reaches operating temperature.

A catalytic converter is an exhaust emission control device that converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction. Catalytic converters are usually used with internal combustion engines fueled by gasoline or diesel, including lean-burn engines, and sometimes on kerosene heaters and stoves.

This indicates that the catalytic converter is functioning properly and is effectively converting harmful emissions into less harmful ones.

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Answer: A

Explanation: I don’t know the answer

Answer: A

Explanation: because it shows why it is on equilibrium

A.The standard potential for the given galvanic cell can be calculated using the Nernst equation: E°cell = E°cathode - E°anode

B. Fe: The iron electrode (Fe) is the anode. It undergoes oxidation and loses electrons during the redox reaction.

To determine the standard potential, we need to find the standard reduction potentials for the cathode (Ag+) and the anode (Fe2+). Using a standard reduction potential table, we find the following values:

E°Ag+ + e- → Ag(s) = 0.799 V (cathode)

E°Fe2+ + 2e- → Fe(s) = -0.44 V (anode)

Now we can substitute these values into the Nernst equation:

E°cell = 0.799 V - (-0.44 V)

= 1.239 V

Therefore, the standard potential for the given galvanic cell is 1.239 V.

B.

Fe: The iron electrode (Fe) is the anode. It undergoes oxidation and loses electrons during the redox reaction.

Ag: The silver electrode (Ag) is the cathode. It undergoes reduction and gains electrons during the redox reaction.

Gains mass: The cathode (Ag) gains mass because silver ions (Ag+) from the solution are reduced and deposited as solid silver (Ag) on the electrode surface.

Loses mass: The anode (Fe) loses mass as it undergoes oxidation and forms Fe2+ ions in the solution.

Attracts electrons: The cathode (Ag) attracts electrons since it is the site of reduction, where electrons are gained.

Positive electrode: The anode (Fe) is the positive electrode because it is the site of oxidation and the source of electrons.

Negative electrode: The cathode (Ag) is the negative electrode because it is the site of reduction and where electrons are consumed.

Stronger reducing agent: The anode (Fe) acts as the stronger reducing agent because it has a more negative standard reduction potential (-0.44 V) compared to the cathode (Ag) with a standard reduction potential of 0.799 V.

In conclusion, the anode (Fe) is the site of oxidation and the stronger reducing agent, while the cathode (Ag) is the site of reduction and attracts electrons. The anode loses mass and is the positive electrode, while the cathode gains mass and is the negative electrode.

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Answer

b. Oil, water, chloroform.

Explanation

Between water, chloroform, and oil, chloroform is the most dense substance (1.5 g/cm3), followed by water which has a density of 1.0 g/cm3. The least dense substance is oil with density of 0.9 g/cm3. Therefore, the oil will be at the top, followed by water, then chloroform will be at the bottom.

The fluids layered from top to bottom are oil, water and chloroform. Therefore, the correct option is option B.

A fluid is defined as a substance that has the ability to flow and conform to its surroundings. They can be found in both liquids and gases, among other forms. Liquids, like water, have a specified volume but no clear shape, whereas gases, like the air, have neither a specific volume nor shape. We need fluids to survive every day. Since water makes up the majority of the fluid in our bodies, they are essential for our survival. Fluids are also essential in many industrial processes, such as manufacturing, energy production, and transportation.

Therefore, the correct option is option B.

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Matter and energy are conserved in nature through their use by biological systems, which is dedicated by the Law of conservation.

Matter and energy conservation indicate that organisms can not create or destroy these elements in nature.

Matter and energy conservation are fundamental for maintaining the state of equilibrium (homeostasis) of biological systems.

In conclusion, matter and energy are conserved in nature through their use by biological systems, which is dedicated by the Law of conservation.

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The direction of electron flow is from the anode to the cathode. The anode is labeled positive (+) and the cathode is labeled negative (-).


When a current flows through a circuit, electrons move from the region of lower potential (negative) to the region of higher potential (positive). Therefore, the direction of electron flow is from the anode to the cathode. The anode is the electrode where oxidation occurs. Oxidation is the loss of electrons, so it becomes positively charged. On the other hand, the cathode is the electrode where reduction occurs. Reduction is the gain of electrons, so it becomes negatively charged.

To summarize, the anode is positive and the cathode is negative. Electrons flow from the anode (positive) to the cathode (negative). In a circuit, the direction of electron flow is from the anode to the cathode. The anode is labeled positive (+) and the cathode is labeled negative (-). This means that electrons, which are negatively charged particles, move from the anode to the cathode. The anode is the electrode where oxidation occurs. Oxidation is the loss of electrons. As a result, the anode becomes positively charged. On the other hand, the cathode is the electrode where reduction occurs. Reduction is the gain of electrons. Consequently, the cathode becomes negatively charged.

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Answer:

Option D, Plate Tectonics

In the rock cycle, surface events takes place at the surface of earth. Thus,

weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.

Explanation:

Answer:

Option D, Plate Tectonics

In the rock cycle, surface events takes place at the surface of earth. Thus,

weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.

Explanation:

Option D, Plate Tectonics

In the rock cycle, surface events takes place at the surface of earth. Thus,

weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.

The metal that is used in media is Nickel while the insulator used in media is silicon.

Metals are those elements that occur at the left hand side of the periodic table. A metal that is very useful in media is nickel because it is very pure and can be used in electronics circuits.

However, an insulator that is used in media is silicon which is used integrated circuits.

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Answer:

The table compares making ethanol by hydration of ethene (ethene and steam) to making ethanol by fermentation (sugar from plant material).

Answer:

When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two. Two cells become four and so on.

Explanation:

The fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.

Fruit basket is defined as a gift basket filled with a variety of fruits.

A fruit basket can be called as a punnet is a compact box or square basket used for gathering, transporting, and selling fruits and vegetables, typically for small berries.

As one basket has 6 strawberries.

So, for completing 725 order we need

= 725 / 6

= 120.8 = 120 strawberries

Thus, the  fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.

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Explanation:

4 subshells are, s, p, d, and f. Each subshell can hold a different number of electrons. The n number determines how many of the subshells make up the shell.

Answer:

A the volume of the ballon will decrease

Explanation:

This is because the temperature decreased so the particles slowed down and need less room or volume to move around and collide in

A positron forms in the nucleus and is promptly ejected from it, just like the beta particle. In an equation, a positron is represented by the sign e+01. As an illustration, potassium-38 emits a positron and changes into argon-38.

A positron has an electrical charge of +1, the same mass as an electron, and a spin of 1/2.

The three argon (Ar) isotopes that are present in nature are argon-36, argon-38, and argon-40. On the periodic table, argon has an average atomic weight of 39.948 amu.

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The equilibrium concentration of CH3OH will be equal to 0.089 if the equilibrium concentration of co is 3.4 × 10–1 m, and the equilibrium concentration of h2 is 6.8 × 10–1 m

An equilibrium concentration is a state when the rate of forward reaction in a chemical reaction becomes equal to the rate of backward reaction

Step 1:

The balanced equation for the reaction is given below:

H2O + Cl2O <=> 2HClO

Step 2:

Data obtained from the question. This includes:

Concentration of H2O, [H2O] = 0.077 M

Concentration of Cl2O, [Cl2O] = 0.077 M

Concentration of HClO, [HClO] = 0.023 M

Equilibrium constant, K =?

Step 3:

Determination of the equilibrium constant. This is illustrated below:

The equilibrium constant for the above reaction is given below:

K = [HClO]^2 / [H2O] [Cl2O]

K = (0.023)^2 / (0.077 x 0.077)

K = 0.089

Therefore, the equilibrium constant for the above reaction is 0.089

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