ASHTON WANTS TO FIND THE VOLUME OF A BLOCK OF WOOD

1.0 mol of K₂ Cr₂07 contains 2 mol K, 2 mol per 7 mol 0.

One mole of atoms of any element carries 6.022 X 1023 atoms, regardless of the kind of detail. Use the periodic table to determine the molar mass of the element. Divide the given mass in grams by the molar mass to locate the range of moles. Multiply the number of moles via Avogadro's wide variety to attain the variety of atoms. There are 24 atoms in a single molecule of C6 H12 06. This chemical compound has 6 atoms of carbon, 12 atoms of hydrogen, and six atoms of oxygen. this is a total of 24 atoms.

The mole is the quantity of substance of a system that includes as many fundamental entities as there are atoms in zero. 012 kilogram of carbon 12 its symbol is mol To discover the number of moles in a sample, simply weigh it and divide the weight by way of the molecular weight. The quotient is equal to the variety of moles. The number of atoms or different particles in a mole is the same for all substances divided by the mass of the substance in grams via its molecular weight. this could provide you with the range of moles of that substance that are inside the targeted mass.

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All molecules are not compounds. Option C.

A compound is a substance made from two or more atoms of different elements that are linked together by bonds. The bond could be an ionic, covalent, metallic, or hydrogen bond.

A molecule, on the other hand, is a group of atoms, the same or different, chemically bonded together and represents the smallest fundamental unit that can participate in chemical reactions.

Going by these two definitions, one can conclude that while all compounds are molecules, not all molecules are compounds. If the group of atoms that bond together is chemically identical, a molecule is formed but not a compound.

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The initial temperature of water is 47.8⁰C

Given,

mass of water is 2450g

absorbed heat is 5.35×105 J

we have to find out initial temperature

First Calculate the change in temperature when 5.35×10^5 J of heat is provided to 2450g of water.

q = m . c . ∆T

q is amount of heat gained

m is the mass of water

c is the specific heat of the substance

∆T is change in temperature

Specific heat of water is 4.18 J/g⁰C

∆T = q / m . c

= 5.35×10^5 / 2450 × 4.18

= 52.2⁰C

Now we know that the final temperature of the water is

100⁰C and that this final temperature is 52.2⁰C

is higher than the initial temperature of the water.

So by, ∆T = T(f) - T(i)

T(i) = T(f) - ∆T

T(i) = 100⁰C - 52.2⁰C

= 47.8⁰C

Therefore, initial temperature of water is 47.8⁰C

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The mass of antifreeze required to fill a 2.5 gallon car radiator is

Since, 1 gallon = 3.785 L

2.5 gallon = 9.4625 L

Given,

Gasoline = 9.4625 L x 1000 mL/L

               = 9462.5 mL

Density = 0.79 g/mL

Mass = Density  x volume                                                (density =  mass   )

Mass = 0.79 g/mL x 9462.5 mL                                                         volume              

Mass = 7475.37 g

Therefore,

Mass of antifreeze, in grams = 7475.37 g

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Zara is examining some animal cells on a slide using a microscope. She is aware that there are animal cells on the slide, but she is unable to see any cells when using the microscope. Give three reasons why Zara might not be able to notice any cells.

Understanding organelles has been greatly aided by microscopes. Most organelles cannot be seen using a light microscope, and those that can (such as the nucleus, mitochondria, and Golgi) cannot be studied in detail because of their size, which is near to the light microscope's resolution limit.

The other cell organelles are too tiny and do not adhere to the dye to be visible under a lab microscope.

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Answer:

4

Explanation:

oxygen has molar mass of 16 g/mol. 64 grams / 16 g/mol = 4mol

The average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.

The density of a substance is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated using the following formula:

D = m/v

Where;

According to this question, a tightly packed box of crackers contains 250 g of crackers and measures 7.0cm X 17.0.cm X 19.0 cm.

Volume = 7.0cm X 17.0.cm X 19.0 cm = 2261cm³

1 cubic centimetre = 0.001 litre

2261cm³ = 2.261L

Density of the crackers = 0.25kg ÷ 2.261L

Density = 0.1105Kg/L

Therefore, the average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.

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An increase in the concentrations of greenhouse gases in Earth's atmosphere would cause an increase in the average temperatures on Earth's surface.

The greenhouse effect occurs when gases build up in the upper atmosphere of the Earth, where they absorb solar heat and trap it. Thus, the heat that ought to be fleeing into space is being held back on Earth. The following gases contribute to this effect:

with a ton more. However, the greenhouse effect is mostly caused by them. By retaining heat in the lower (rather than upper) atmosphere, this action will raise temperatures on the surface of the globe.

Heat from the sun would be trapped on Earth as the concentration of greenhouse gases (such the ones described) in the atmosphere increased, resulting in an increase in the global temperature.

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The volume of the liquid sodium is 121.64 L

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can obtain the volume of the liquid. Details below

Density = mass / volume

Thus,

Volume = mass / density

Volume of liquid = 1.13×10⁵ / 0.929

Volume of liquid = 121636.17 cm³

Divide by 1000 to express in liter

Volume of liquid = 121636.17 / 1000

Volume of liquid = 121.64 L

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Answer:

in the middle region of the periodic table, where the transition metals are

aka between Group II and III

Answer:

Student A's Date was more precise.

Explanation: Her answers are closer together whereas student B's answers are further apart in numbers.

Answer:

d) law of conservation of mass

Explanation:

Answer:

Na+e-1=Na

Explanation:

dfh low so to homework all no lol Show

Answer:

voodoo voodoo voodoo

Answer:

The Bio chemist would study how fast nitrogen and hydrogen form ammonia.

Explanation:

The  moisture must be removed from air feeding pneumatic controls because moisture corrodes the walls of an air cylinder, dilutes the oil needed for the head and rod, and reduces reaction time.

What is the mechanism of a pneumatic controller?

A pneumatic controller is a mechanical apparatus created to gauge temperature or pressure and send a corrective air signal to the last control element. The heat or pressure sensing system and the air signal relay system work together to power a pneumatic controller.

Moisture corrodes the walls, dilutes the oil needed for an air cylinder's head and rod, and slows reaction time. Efficiency and output are lost as a result. Rubber valve diaphragms may harden and rupture if moisture is allowed to get to them. Spools and pistons can develop pits as a result of moisture.

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In the image given, the difference in the activation energy is observed on addition of a catalyst in the same reaction.

Activation energy is the minimum initial energy needed for a reaction to start. It is denoted as [tex]E_a[/tex].

a) The difference between the reactions is that on addition of a catalyst, the activation energy is reduced to form the same product.

The similarity is that these peaks are basically the transition states where the energy is highest, and the reactant molecules are highly unstable and immediately get converted to the products.

b) Enzymes in the second reaction are the catalysts which increase the rate of the reaction and reduce the activation energy required for the reaction to happen. Not only do the enzymes reduce the activation energy, but they also introduce a multiple energy reaction pathway which must be fulfilled in order to form the products.

c) The second reaction is a multi-step reaction and occurs in a series of collisions, where each collision produces an intermediate molecule which collides further until the final product molecules are formed. Thus, each collision step has its own activation energy peak.

The original reaction has only one activation energy peak as the reactants collide once and form the products immediately thereby consuming a lot of energy.

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Answer:

I'm worried about going to college and living in a dorm. I'm currently keeping in touch with my roommates to know what kind of people they are. Also, I'm starting to pack and get ready to move to my dorm.

Explanation:

Answer:28, 34, 85, 6.6

Explanation:

The physical and chemical properties of a compound is dependent upon its bond strength. Physical properties such as  boiling, melting point etc . increases with bond strength. Solubility decreases with increase in bond strength.

The bond strength of a molecule or compound is the measure the energy to break or form the bond. That it tells how much strong the bond is. It directly proportional to the bond order.

Boiling point of a compound is the temperature at which the compound changes from liquid to gas state. Melting point is the temperature at which a   to liquid form. All these phase changes are dependent on the electrical force within the molecules.

As the electrostatic force of attraction increases, more energy have to be applied to it to weaken the bonds and make the molecules apart. Therefore, the boiling point and melting point increases.

Similarly the molecules with higher bond strength have less solubility at normal conditions. The reactivity of molecules decreases as their bond strength increases since more energy needed to break the bonds.

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Answer: As you move down the column in the periodic table the ionic charge increases.

Explanation: This is because the effective nuclear charge (Z_sub_eff) provides a shielding constant so that the nuclear charge from the protons cannot interfere with the negative nuclear force of the electrons.

Yes, ionic charge patterns exist. Elements in the same group often share similar charges due to common valence electron configurations.

Indeed, a pattern emerges in terms of ionic charges within the periodic table. Elements within the same group (vertical columns) often exhibit similar ionic charges due to sharing common valence electron configurations.

For instance, Group 1 elements tend to form +1 cations (e.g., Na⁺, K⁺) by losing their single valence electron, while Group 2 elements form +2 cations (e.g., Mg²⁺, Ca²⁺) by losing two valence electrons. Similarly, elements in Group 17, known as halogens, commonly form -1 anions (e.g., F⁻, Cl⁻) by gaining one electron to achieve a stable electron configuration.

This recurring trend can be attributed to the desire of atoms to achieve a full valence shell, either by losing or gaining electrons, leading to predictable ionic charges within specific groups of elements.

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The percentage atom economy is 62%

2NH3 + H₂SO4 → (NH4)2SO4

34 gram 98 gram 210 gram

2 mol 1 mol 1 mol

% atom economy = mass of atoms in desired product/total mass of atom in Product x 100

% atom economy = 132/210 x 100 = 0.62 = 62%

The amount of desirable useful products produced from reactants is measured by atom economy, also known as atom efficiency. It is frequently expressed as a percentage and is referred to as percentage atom economy. The required product atoms are divided by the total number of reactants, which is equal to the total number of product atoms, to determine the percent atom economy

Higher atom economy reactions provide more of the desired product while producing less waste.

The following stages can be used as a generic method to compute the atom economy:

Determine the atom economy percentage.

Hence, percentage atom economy is 62%

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Answer:

2

Explanation:

Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.  

Peer reviews are used by scientists to ensure objectivity and reduce prejudice in their study. To create original ideas and hypotheses, scientists need both logical reasoning and creative thinking.

As scientists frequently interact, exchange ideas, and build on one another's work, it is a complex social endeavour. Understanding and making sense of the natural world is the central tenet of science.

Finally, scientists separate their personal beliefs from empirical evidence in order to stay as objective as possible in their research.

Thus, Scientists engage in peer reviews to avoid bias, Science is a blend of logic and innovation and Scientific ideas are not durable and cannot adjust to change as new data is collected. The correct options are 1,2, and 7.  

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Based on the information below . The atoms of the same element are Atom A and Atom C .

Atoms of same element have the same atomic number. so the number of protons and electron are same but they have different atomic masses called as Isotopes.  so, the atoms having different number of neutron will have different masses.

In the given case ,

Atom A               Atom B             Atom C

8 protons           10 protons        8 protons

8 neutrons         10 neutrons       10 neutrons

8 electrons         10 electrons      8 electrons

so, In Atom A  and Atom C , the number of protons and electrons are same but  the have different atomic masses means having different no. of neutrons. so Atom A and Atom C are the atoms of same elements.

Hence,Based on the information below . The atoms of the same element are Atom A and Atom C.

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Answer:

Na

2

SO

4

.10H

2

O

=(2×23)+32+(4×16)+(10×18)

=46+32+64+180

=322

The number of C atoms in 0.247 mol of C is  1.48 X 10²³ .

The number of C atoms in 1 mol of C is 6.02 X 10²³, which is also called Avogadro’s number .

so, The number of C atoms in 0.247 mol of C is _

0.247x6.02x10²³= 1.48 X 10²³.

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Cows and other ruminants are significant producers of the greenhouse gas methane—contributing 37 percent of the methane emissions resulting from human activity.

Greenhouse gases (also known as GHGs) are gases in the earth's atmosphere that trap heat. During the day, the sun shines through the atmosphere, warming the earth's surface. At night, earth's surface cools, releasing heat back into the air. But some of the heat is trapped by the greenhouse gases in the atmosphere.

While carbon dioxide is typically painted as the bad boy of greenhouse gases, methane is roughly 30 times more potent as a heat-trapping gas. As temperatures rise, the relative increase of methane emissions will outpace that of carbon dioxide from these sources, the researchers report.

The cow's ramen is like a large fermentation vat. More than 200 different bacteria and 20 types of protozoa help the cow to utilize fibrous feed stuffs and non-protein nitrogen sources. Bacteria adhere to the feed and gradually digest the fermentable material.“You can probably reduce methane by about 20-25% by altering diet,” he says.

One study by researchers at the University of California, Davis, estimated it might be possible to reduce global methane emissions from cows by 15% by changing their diet.

Thus, this evidence support the passage.

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The volume of hydrogen needed to react with 5.00 L of oxygen based on the mole ratio is 10.00 L.

The volume of hydrogen gas is needed to react with 5.00 L of oxygen is determined from the mole ratio of the reactants as shown in the equation of reaction below:

Equation of reaction:  2 H₂ + O₂ → 2 H₂O

Mole ratio of hydrogen to oxygen = 2 : 1

Moles of gases occupies equal volume

Therefore, Volume ratio of hydrogen to Oxygen = 2 : 1

Volume of hydrogen needed to react with 5.00 L of oxygen = 5.00 * 2

Volume of hydrogen needed to react with 5.00 L of oxygen = 10.00 L

In conclusion, the volume of hydrogen required is obtained from the mole ratio of hydrogen and oxygen in the reaction.

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