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1. Explain how you think changing in the thickness or length of the nail will affect the strength of the electromagnet

Answer:

D. Cs, Na, K

Explanation:

Elements in the same column of the Periodic Table have similar chemical properties.

Answer:

d) Cs, Na, K

Explanation:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.  Cs, Na, and K are all in the same vertical column (which is called Group IA or the alkali metals).

If we have 10 moles of NaN3, we would produce more N2 than Na.



When NaN3 is heated, it decomposes into Na and N2 gas according to the following balanced equation:

2 NaN3(s) → 2 Na(s) + 3 N2(g)

From the equation, we can see that for every 2 moles of NaN3, we would produce 2 moles of Na and 3 moles of N2. Therefore, if we have 10 moles of NaN3, we would produce:

- 10 moles of NaN3 × (2 moles of Na / 2 moles of NaN3) = 10 moles of Na
- 10 moles of NaN3 × (3 moles of N2 / 2 moles of NaN3) = 15 moles of N2

This means that we would produce more N2 (15 moles) than Na (10 moles).

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The rate at which energy is released for a 1.5-gram sample of tritium is

5.44 x 10^21 MeV/second.

Generally, The half-life of tritium is 12.3 years, which means that after 12.3 years, half of the tritium atoms in a sample will have decayed. The number of decay per unit of time is called the decay rate, and it decreases over time as the number of undecayed atoms decreases.

To calculate the decay rate of a 1.5-gram sample of tritium, we need to know the number of tritium atoms in the sample. The atomic mass of tritium is 3.016049 u (unified atomic mass units), so a 1.5-gram sample of tritium contains 1.5 / 3.016049 = 0.497078 moles of tritium atoms. Avogadro's number is the number of atoms in a mole of a substance, and it is equal to 6.02214076 x 10^23 atoms/mol. Therefore, a 1.5-gram sample of tritium contains 0.497078 x 6.02214076 x 10^23 = 2.98 x 10^23 tritium atoms.

The energy released during each tritium decay is 0.018 6 mev, so the total energy released per second by a 1.5-gram sample of tritium is 0.018 6 mev/decay x 2.98 x 10^23 decays/second = 5.44 x 10^21 mev/second. This is the rate at which energy is released from the tritium sample.

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Aqueous solutions have various uses because they participate in various processes, creating a wide variety of substances that tend to dissolve in water.

Blood is a good example of important aqueous solutions, because its solubility allows life to be sustained.

Blood is an aqueous solution made up of salts and proteins (plasma), in which erythrocytes or red blood cells, white blood cells or leukocytes are found, and the functions that these components fulfill are important for life.

Other examples of aqueous solutions:

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The structure of ethane can be represented as:

\(\[\text{H} - \text{C} - \text{C} - \text{H}\]\)

Optical inactivity is observed when a molecule lacks an asymmetric center or chiral centre. An asymmetric center is a carbon atom that is bonded to four different substituents. In the absence of an asymmetric center, the molecule will be optically inactive.

A simple example of a molecule without an asymmetric center is \textbf{ethane} (\(C_2H_6\)). Ethane consists of two carbon atoms bonded to each other by a single bond, with three hydrogen atoms attached to each carbon atom.

The structure of ethane can be represented as:

\(\[\text{H} - \text{C} - \text{C} - \text{H}\]\)

The chemical formula for ethane, a paraffin series hydrocarbon (compound of hydrogen and carbon), is C2H6. It is a colourless, odourless, gaseous hydrocarbon. The only hydrocarbon with a single carbon-carbon bond has the simplest structural makeup, and that is ethane.05

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Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, by transferring electron or sharing electrons,  particles combine to form the variety of matter.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. By transferring electron or sharing electrons,  particles combine to form the variety of matter.

Therefore, by transferring electron or sharing electrons,  particles combine to form the variety of matter.

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Answer:

3CO + Fe₂O₃ = 2Fe + 3CO₂

Answer:

1.BaCO3 2.MgBr2 3.aluminum and oxygen 4.Potassium chloride

Explanation:

Answer:

A. Things are measured the same way each time.

Explanation:

Answer:

C. 0.72 M

Explanation:

To calculate the molarity use the following equation, C=n/V

You have the molar number n which is 0.702 and the volume 0.98 L

Replace those numbers in the formula C=0.702/0.98= 0.72 M

Answer:

The electromagnet and wire have to be in contact to apply the force.

Explanation:

Answer:

Explanation:

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According to EarthObservatory, The Earth’s mantle is mostly made of solid rock. The misconception of a liquid mantle arises from expressions like “a subducted tectonic plate sinks into the mantle” or “continental drift”, expressions that implicitly refer to the liquid element.

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In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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Answer:

Isabelle is taking a survey to find the most popular music group of students in her community. Which of these is not a way for her to get a representative sample of this information?

 ask every tenth student she sees ac a concert

 ask every fifth student entering her school in the morning

 ask every third student she encounters at the mall

 ask every student at a local movie theater

Explanation:

answer: bits of rock rusting when exposed to oxygen and water

Explanation: i think because when it rains the water is left and freezes and night making the rock expand or start to Rust

Answer:

2 C4H10     +  13  O2    ====>   8  CO2      + 10 H2O

Explanation:

The ratio strength (w/v) of the diluted solution is 1:1000 or 0.1% w/v.

The original solution is a 1:20 w/v solution, which means that for every 1 gram of solute, there is 20 mL of solution. Using this information, we can calculate the amount of solute in the original 50 mL of solution:

1 gram / 20 mL = x grams / 50 mL

x = 2.5 grams of solute

When this 50 mL of solution is diluted to 1000 mL, the amount of solute remains the same, but the volume of the solution increases. The new ratio can be calculated by dividing the weight of the solute by the volume of the solution:

2.5 grams / 1000 mL = 0.0025 grams/mL

Converting this to a percentage w/v:

0.0025 grams/mL x 100 = 0.25% w/v

Therefore, the ratio strength is 1:1000 or 0.1% w/v.

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Answer:

sulfur

Explanation:

From the given lists of elements, the one with the most electronegativity is Sulfur.

  Electronegativity is of an element is a property that combines the ability of its atom to lose and gain electrons.

It is a measure of the relative tendency with which the atoms of the element attract valence electrons in a chemical bond.

Using the Pauling's electronegative table of elements;

   Here are electronegativity values of the given elements;

selenium                 2.4

arsenic                    2.0

phosphorus            2.1

sulfur                      2.5

We see that the value of sulfur is the highest.

Answer:

B. The Buoyant Force

Explanation:

'The Buoyant Force is an upward force exerted by a fluid on any object in the fluid.'

An iceberg has a volume of 7670 cubic feet. The mass of the ice (in kg) composing the iceberg is 0.0002483 kg

The volume of iceberg = 7670 cubic feet.

Density of ice = 0.917 g/cm\(^{3}\)

so, Density is given by,

Density = mass / volume

density of ice =  (0.917 /1000) kg/cm\(^{3}\)

1 cm\(^{3}\) = 0.00003531 ft\(^{3}\)

therefore,

0.000917 kg/cm\(^{3}\) = (0.000917 × 0.00003531 ) kg/ft\(^{3}\)

                            = 0.0000000324 kg/ft\(^{3}\)

now,putting the values in formula , we get,

Density = mass / volume

mass = density × volume

         = (0.0000000324 × 7670 ) kg

         = 0.0002483 kg

Hence,An iceberg has a volume of 7670 cubic feet. The mass of the ice (in kg) composing the iceberg is 0.0002483 kg.

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It's O2 which is oxygen....

Answer:

Explanation:

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Answer:

The answer is B.  A river is a body of water, therefore, there will always be some water running over the rock.

Answer:

The answer is: B

Explanation:

The reason for this is because when a rock is underwater (the river, in this case), the water runs across it non-stop until the rock is removed from the water. The only way it can be polished if it is submerged under the water for quite some time (years and years).

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the answer is boiling

Explanation:

as you boil it evaporates,equal to external atmospheric pressure

Explanation:

the answer is boiling cuz if heat is added to a liquid it will start to boil

Ammonia in this instance has a single pair of electrons. These are the electrons that take part in chemical reactions in a direct way.

Drawing the compound's Lewis structure will reveal the quantity of lone pairs. Take the NH3 molecule, or ammonia, as an example. The valence electrons of each individual atom must first be added up. Hydrogen has one while nitrogen has five. Thus, 5 + 1(3) = 8 valence electrons total. Therefore, the molecule must be surrounded by 8 electrons. Knowing the different types of bonds that are involved will help you distribute these to the atoms. Keep in mind that the compound has two electrons in each single bond that joins two atoms. It is also essential to follow the Octet Rule at all times. According to this principle, an atom must have eight electrons in order to be stable. The shared electrons are shown as bonds, while the lone pairs are shown as dots. So, simply draw the Lewis structures of the lone pairs in a compound and count the dots to determine their number.

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Answer:

NaCl + AgF → NaF + AgCl

Explanation:

A double replacement reaction is a type of chemical reaction that occurs when two reactants exchange cations or anions to yield two new products.

From all the reactions given ,

Answer:

0.998 g/mL

Explanation:

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The elements are arranged in periods and groups. They are also arranged by the way they react to other chemicals, or the chemicals that are mixed in the element to make it.

The evidence that explains how the structure of each element is different from another is that the elements are arranged in periods and groups.

The periodic table refers to the tabular display of the chemical elements. It should be noted that the periodic table is arranged based on the increasing atomic number of the elements.

The elements that are in the periodic table are also arranged by the way they react to other chemicals. Therefore, the elements that are in a particular group typically have the same characteristics.

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The two neutrons at the end of the process can help sustain a chain reaction. Option 1 is correct

Neutrons can start a chain reaction, which is a sequence of nuclear fission processes. A uranium-235 atom may split as a result of a neutron's collision with it, releasing more neutrons. The subsequent collisions between these neutrons and other uranium-235 atoms may break those atoms as well. A lot of energy can be released if this process is allowed to spiral out of control.

The fission of a uranium-235 atom can release the two neutrons at the end of the process. These neutrons can divide other uranium-235 atoms if they collide with them, continuing the chain reaction.

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