Just want to double check my answers. Please help

The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Answer:

(850000) - (9.0 × 10^5) calculated with significant figures is -0.5 × 105, which contains 1 sig figs and 1 decimals. There are 2 steps to calculate (850000) - (9.0 × 10^5) with sig figs. To count the number of sig figs in -0.5 × 105, strip the leading insignificant digits (-0.) to get the significant digits (5).

ANswer is  1 (-0.5e5)

Answer:

the length of the bacterial mat in inches is approximately 212.6 inches.

Explanation:

To convert decimeters to inches, we can use the conversion factor of 1 inch equals 2.54 centimeters (cm), which can be written as:

1 inch = 2.54 cm

We can also convert decimeters to centimeters by multiplying the value by 10, since there are 10 centimeters in one decimeter. So, to convert 54.0 decimeters to inches, we can follow these steps:

54.0 dm * 10 = 540 cm

540 cm / 2.54 cm/inch = 212.5984252 inches (rounded to 9 decimal places)

Therefore, the length of the bacterial mat in inches is approximately 212.6 inches.

The change that would decrease the strength of the electromagnet is decrease in the number of wire coils.

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

The strength of an electromagnet depends on:

Thus, using fewer loops of wire per meter in the coil, decreasing the current in the wire and removing the iron core will decrease the strength of the magnetic field of an electromagnet.

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Answer:

Energy levels

Explanation:

Elements in one row of the periodic table have the same energy levels. A row on the periodic table is the horizontal arrangement of elements. These rows are called periods.

There are 7 periods on the periodic table.

Answer:

70% sure it is chemical bonds

Explanation:

:)

We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.

Here's an overview of the catalytic cycle, including the necessary details:

i. Chemical structure of the catalyst:

Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]

ii. Molecular geometry of the catalyst:

The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.

iii. Type of reactions involved:

The catalytic cycle involves several reactions, including:

iv. Starting material, reagent, and solvent:

The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).

v. Major and minor end-products:

The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.

vi. Intermediates:

The intermediates in the catalytic cycle include:

These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.

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The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

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while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

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Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.

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Answer:

B. summer

Explanation:

The northern hemisphere experiences summer during the months of June, July, and August because it is tilted toward the sun and receives the most direct sunlight.

Statement a is true, as the melting points of saturated fatty acids do increase with increasing chain length. Statement b is false, as saturated fatty acids do not contain double bonds. Statement c is false, as △9, 12-all cis, 18:3 represents alpha-linolenic acid, not linoleic acid. Statement d is true, as glycerol is indeed a by-product of the hydrolysis of fats.

a. True. The melting points of saturated fatty acids increase with increasing chain length. This is because longer fatty acid chains have stronger intermolecular forces, such as van der Waals forces, which require more energy to break and result in higher melting points.

b. False. Saturated fatty acids do not have double bonds. They are composed of only single carbon-carbon bonds. Double bonds are found in unsaturated fatty acids.

c. False. △9, 12-all cis, 18:3 is not linoleic acid. It represents the structure of alpha-linolenic acid. Linoleic acid is △9, 12-18:2, which means it has two double bonds located at the 9th and 12th carbon positions.

d. True. A by-product of the hydrolysis of fats is glycerol. When fats undergo hydrolysis, they are broken down into their constituent fatty acids and glycerol. Glycerol is a three-carbon molecule that is a component of triglycerides (fats).

During hydrolysis, the ester bonds between the fatty acids and glycerol are cleaved, resulting in the release of fatty acids and glycerol.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{1.8 \times {10}^{24} }{6.02 \times {10}^{23} } = 2.990.. \\ \)

We have the final answer as

Hope this helps you

Answer: Oxygen

Explanation: Its found on the periodic table as an element.

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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The mass of hydrogen needed to produce 51.0 grams of ammonia is  ≈ 9.07 grams.

To determine the mass of hydrogen required to produce 51.0 grams of ammonia (NH3) using the Haber process, we need to calculate the stoichiometric ratio between hydrogen and ammonia.

From the balanced chemical equation:

3 H₂(g) + N₂(g) → 2 NH₃(g)

We can see that for every 3 moles of hydrogen (H₂), we obtain 2 moles of ammonia (NH₃).

First, we need to convert the given mass of ammonia (51.0 grams) to moles. The molar mass of NH₃ is 17.03 g/mol.

Number of moles of NH₃ = Mass / Molar mass

                     = 51.0 g / 17.03 g/mol

                     ≈ 2.995 moles

Next, using the stoichiometric ratio, we can calculate the moles of hydrogen required.

Moles of H₂ = (Moles of NH₃ × Coefficient of H₂) / Coefficient of NH₃

           = (2.995 moles × 3) / 2

           ≈ 4.493 moles

Finally, we can convert the moles of hydrogen to mass using the molar mass of hydrogen (2.02 g/mol).

Mass of H₂ = Moles × Molar mass

          = 4.493 moles × 2.02 g/mol

          ≈ 9.07 grams

Therefore, approximately 9.07 grams of hydrogen is needed to produce 51.0 grams of ammonia in the Haber process.

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Answer:

c

Explanation:

lol

Answer:

That is correct my dude

Explanation:

Answer:

In order to create a Bohr model for carbon, you must start in the first shell of electrons. The first shell can hold up to 2 of carbons 6 electrons. After filling up the first shell you can move on to the second that can hold up to 8 electrons. The finished Bohr model would have 2 electrons in the first shell and 4 in the second shell.

Explanation:

Answer:

elemnt b

Explanation:

Explanation:

It is the emission of electron from a metal under the effect of light is known as photo electric effect

I hope this imformation help full for you

Answer: the particles in the water heats up and the hotter to gets the faster it moves. When there is no where for the heat to go it builds up and pushes its way out and turns to steam when it hits cool air

Explanation:

STEP-BY-STEP EXPLANATION:

Firstly, we need to define primary, a secondary, and tertiary alcohol

Primary alcohol: A primary alcohol in which the hydroxyl group is bonded to a primary carbon atom. Examples of primary alcohol are ethanol and 1-butanol.

The structure of a primary alcohol is given below

Secondary alcohol: A secondary alcohol has the hydroxyl group on a secondary carbon atom, which is bonded to two other carbon atoms.

Examples of secondary alcohol are propan-2-ol, butan-2-ol, pen-3-ol

The structure of a secondary alcohol is given below

Tertiary alcohol: Tertiary alcohol is a compound in which a hydroxy group, -OH, is attached to a saturated carbon atom which has three other carbon atoms attached to it.

Examples of tertiary alcohol are 2-methylpropan-2-ol, 2-methylbutan-2-ol

The structure of tertiary alcohol is given below

According to the question given,

The first structure has a single alkyl group and the functional group(OH) is attached to the primary atom. Hence, Butan-ol is a primary alcohol.

The second structure has two alkyl groups and the function group is on the second carbon atom. Hence, it belongs to the secondary alcohol group.

The third structure belongs to tertiary alcohol

Answer:

Usually involves the removal of

vegetative or non-endospore forming pathogens.

Explanation:

Usually involves the removal of

vegetative or non-endospore forming pathogens.

Answer: true

Explanation: In this example, the processes (perceive, process, and respond), are done in a matter of milliseconds, but reaction time can vary depending on a variety of factors: Complexity of the stimulus-The more complex the stimulus, the more information that has to be processed, the longer this process will take.

shared

Covalent bonds are characterized by the sharing of valence electrons.

Electronegativity

Covalent bonds occur between atoms that have similar electronegativity. Remember that electronegativity is how strongly an atom pulls electrons toward itself. So, if 2 atoms have similar electronegativities, then they will pull somewhat equally upon the electrons and share them. Most commonly, covalent bonds occur between nonmetals.

Ionic Bond

The second major form of bonding is ionic bonding. Ionic bonds form when there is a large difference in electronegativities. The difference is great enough that one of the atoms will completely lose one or more electrons, while the other will take the electrons. Since electrons are being transferred, the atoms become ions. Ionic bonds commonly occur between metals and nonmetals.