A hypothesis does_____ need to be correct in order for an experiment to be a success.

Reproduction is the characteristic of life is demonstrated when oak trees make many acorns that can become new oak trees.

Oak trees has the majestic branches consist of huge areas, having notable characteristics, its  height which reach from heights of up to 100 feet, and having the width of up to 150 feet.

The oak family is the largest family consist of  600 species, divided into White oak which is a dark grayish-brown color and the branches of the white oak are not twisted, produce acorns with colorings that range from light green to tan, and rich green leaves.

Red Oak tree have bright red color and the feature like recognizable thick golden hairs that grown along the underside of its leaves.

Black Oak  is dark-colored trunk for which this tree is named.  Another classic feature  with twisted branches and root system, contoured shape of the black oak.

For more details regarding oak tree, visit:

https://brainly.com/question/3521494

#SPJ2

The Lewis structure of silane (SiH₄) consists of a central silicon atom bonded to four hydrogen atoms. According to VSEPR theory, it has a tetrahedral geometry with no lone pairs on the central atom and bond angles near 109.5 degrees.

The student's question pertains to predicting the 3-D shapes of molecules using Valence Shell Electron Pair Repulsion (VSEPR) theory, specifically for the molecule silane (SiH₄). To predict the molecular geometry using VSEPR, we start by drawing the Lewis structure for silane, where silicon (Si) is at the center with four hydrogen atoms (H) bonded to it, each sharing a pair of electrons to complete the Si valence shell.

Following the VSEPR theory, the molecule adopts a shape that minimizes electron pair repulsions, which, in the case of silane with four bonded atoms and no lone pairs on the central atom, results in a tetrahedral geometry. The Lewis structure illustrates this with four single bonds extending from the silicon atom towards the hydrogen atoms. Any lone pairs (which silane doesn't have) would also be considered to provide a full understanding of the molecule's geometry.

Considering the application of VSEPR theory, recall that the VSEPR theory accurately predicts the tetrahedral shape for methane (CH₄), which is structurally analogous to silane (SiH₄). Therefore, we can conclude that the 3-D shape of silane will also be tetrahedral, with bond angles close to 109.5 degrees between the bonds.

Final answer:

The third equivalence point for phosphoric acid is not observed due to the weak acidity of HPO, resulting in an unclear definition of the pH at this point.

Explanation:

The third equivalence point for phosphoric acid (H3PO4) is not observed in the titration curve because HPO is a very weak acid, resulting in the third deprotonation step having a pH that is not well-defined.

The first two equivalence points are seen at approximately pH 4.6 and pH 9.8, corresponding to the deprotonation of H3PO4 and H2PO4-, respectively. Due to the weak acidity of HPO, the third equivalence point at pH ≈ 13 is not clearly distinguishable

To obtain 0.0500 moles of NH4Cl from a 1.00 M solution, we need 50.0 mL of the solution. This is calculated by dividing the moles needed by the molarity of the solution.

To determine the volume of ammonium chloride (NH4Cl) solution needed, we first need to know the molarity of the solution. The molarity can be calculated using the formula: Molarity (M) = Moles of solute / Volume of solution (in liters).

In the given information, a 5.36-g sample of NH4Cl is added to make a solution of 0.100 L. The molar mass of NH4Cl is approximately 53.49 g/mol, so 5.36 g is about 0.100 moles. Therefore, the molarity of the NH4Cl solution is 0.100 moles / 0.100 L = 1.00 M.

If we need 0.0500 moles of NH4Cl for the reaction, we can use the molarity to calculate the needed volume: Volume = Moles / Molarity = 0.0500 moles / 1.00 M = 0.0500 L or 50.0 mL. Therefore, we need 50.0 mL of the NH4Cl solution to provide the 0.0500 moles needed for the reaction.

https://brainly.com/question/20458032

#SPJ12

To complete the reaction without any leftover NH4Cl, you will need a volume of 0.500 L or 500 mL of the solution.

To calculate the volume of the solution needed, we can use the formula: volume (in liters) = moles / molarity. In this case, the moles of ammonium chloride is given as 0.0500. We can calculate the molarity by dividing the moles by the volume in liters. The given volume of the solution is 0.5000 L. So, the molarity will be:

Molarity = Moles / Volume = 0.0500 moles / 0.5000 L = 0.100 M

Now, we have the molarity, which is 0.100 M. To find the required volume of the solution, we can rearrange the formula: volume = moles / molarity. Substituting the given values, the volume will be:

Volume = Moles / Molarity = 0.0500 moles / 0.100 M = 0.500 L or 500 mL

https://brainly.com/question/39609676

#SPJ2

A common unit of energy is the calorie. A calorie is defined as the amount of heat that is needed to raise the temperature of one gram of water one degree centigrade. Modern convention uses a unit of energy called a joule. A calorie is equal to 4.184 joules. A joule is approximately the energy needed to lift 2000 grams a distance of 10 centimeters.

Heat is transferred by either direct transfer from one object touching another or by the emission of radiation in the form of infrared radiation. Two results can occur as a result of this transfer of thermal energy. A substance can undergo either a change in temperature or a change in physical state.

When a substance exchanges heat with its surroundings without changing its physical state, the substance will undergo a change in temperature. This change in temperature depends on a property called specific heat capacity.

Specific heat capacity is the "heat needed to produce a given temperature change (in Celsius or Kelvin) per gram of substance" and is expressed in the units J/gK. Specific heat capacity depends on both the type of substance and the mass of the substance.The "D" means "change in" and "q" represents the quantity of heat.

Considering the definition of mass number, the mass number of the ion is 209.

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them.

Mass Number is the integer equal to the sum of protons and neutrons present in the nucleus of an atom. This is:

Mass number = (number of protons) + (number of neutrons)

It is represented by the letter A.

In this case:

So:

Mass number = 83 + 126

Solving:

Mass number= 209

In summary, the mass number of the ion is 209.

Learn more:

Final answer:

Tyrosine's chemical formula is C₉H₁₁NO₃. It is an amino acid essential for protein synthesis and acts as a precursor for important molecules in the body.

Explanation:

The chemical formula for tyrosine is C₉H₁₁NO₃.

Tyrosine is an amino acid that contains 9 carbon atoms, 11 hydrogen atoms, 1 nitrogen atom, and 3 oxygen atoms. The molecular formula for tyrosine is derived based on the composition of these elements within the molecule.

Additionally, tyrosine is a non-essential amino acid that plays a role in protein synthesis, and it is also a precursor for various important molecules in the body like neurotransmitters and hormones.

The complete balanced chemical reaction to this would be:

2 Fe  +  3/8 S8  -->  Fe2S3

First convert mass into number of moles.

moles Fe = 3 g / (55.845 g/mol) = 0.05372 mol Fe

moles S8 = 2.5 g / (256.52 g/mol) = 0.0097458 mol S8

Then we find the limiting reactant. The limiting reactant is the one which has lower (moles/coefficient) ratio.

Fe = 0.05372 / 2 = 0.02686

S8 = 0.0097458 / (3/8) = 0.02599

So since S8 has lower ratio, therefore it is the limiting reactant so we base our calculation from it. From the reaction, we get 1 mole of Fe2S3 for every 3/8 mol of S8, therefore:

moles Fe2S3 = 0.0097458 mol S8 * (1 mole Fe2S3 / 3/8 mol S8)

moles Fe2S3 = 0.02599 mol

The molar mass of Fe2S3 is 207.9 g/mol, so the mass is:

mass Fe2S3 = 0.02599 mol * 207.9 g/mol

mass Fe2S3 = 5.4 grams

The answer is D

Just had this question

The periodic law was derived from the observation of recurring similar properties among elements when arranged by atomic mass, which then shifted to atomic number. This led to the development of the modern periodic table where elements are grouped based on their properties, as demonstrated by groups of elements like the halogens exhibiting closely related characteristics.

The observations that led to the periodic law were predicated on the identification of patterns in the properties of elements when arranged by increasing atomic mass, which was later refined to atomic number. Early chemists noticed that elements with similar properties occurred at regular intervals, a concept known as periodicity. Dmitri Mendeleev, in particular, played a pivotal role, noting the regular occurrence of properties and organizing elements into a table accordingly, even leaving gaps for then-undiscovered elements, predicting their existence and properties. His work was critical in developing the modern periodic table, where elements are positioned in order of increasing atomic number, and housed in groups and periods where elements in the same group exhibit similar chemical properties.

Examples confirming periodic law include the observation that all halogen elements in group 17 show similar properties, such as being non-metals and forming salts with metals. Additionally, the observation that all metals display metallic characteristics and parallel reactivity patterns supported the formulation of the periodic table. Moreover, advancements like the discovery of radioactivity, while not a direct observation leading to the periodic law, provided further insight into the atomic structure and properties of elements.

Explanation:

A pure substance is defined as the substance that contains same type of atoms or atoms of one type of molecule.

A pure substance will always have a fixed melting and boiling point.

For example, at room temperature bromine is a liquid and its boiling point of [tex]58^{o}C[/tex] and a melting point of [tex]-7.2^{o}C[/tex].

Hence, bromine is a pure substance.

Whereas when two or more different substances are mixed together irrespective of their ratio by mass then they are known as mixtures. And, mixtures always show a range of temperature for their melting and boiling point.

Hence, bromine is not a mixture.

Answer:

Carbon, hydrogen and oxygen.

Explanation:

Hello,

Chemically speaking, sucrose is the molecule composing the sugar and it is shown on the attached document wherein it is seen that it is made up of carbon, hydrogen and oxygen. In addition, it is categorized as disaccharide, a molecule consisting of two monosaccharides: glucose and fructose. It is produced naturally in plants, from which table sugar is refined. It has the shown below molecular formula:

[tex]C_{12}H_{22}O_{11}[/tex]

Best regards.

To calculate the number of grams of HCl that can react with Al(OH)3, use the balanced chemical equation and stoichiometry. 0.470 g of Al(OH)3 reacts with approximately 1.32 g of HCl.

To calculate the number of grams of HCl that can react with 0.470 g of Al(OH)3, we need to use the balanced chemical equation and stoichiometry. The balanced equation for the reaction between HCl and Al(OH)3 is:

6HCl + Al(OH)3 → 3H2O + AlCl3

From the equation, we can see that 6 moles of HCl react with 1 mole of Al(OH)3. To find the number of moles of HCl, we can use the molar mass of Al(OH)3 (78.0 g/mol) to convert the mass of Al(OH)3 to moles. Then, we can use the stoichiometry to calculate the number of moles of HCl. Finally, we can use the molar mass of HCl (36.46 g/mol) to convert moles of HCl to grams. Let's do the calculations:

Therefore, the number of grams of HCl that can react with 0.470 g of Al(OH)3 is approximately 1.32 g of HCl.

MO theory i.e. molecular orbital theory is used to determine the structure of molecule and explains the bonding present in the molecule by using linear combination of atomic orbitals. The bond length in the given species of oxygen can be identify on the basis of the positions of the electrons in this theory.

The mathematical expression of bond order is given by:

[tex]Bond order = \frac{1}{2}\times (electrons in bonding Molecular orbitals - electrons in anti-bonding Molecular orbitals)[/tex]

The molecular diagrams are shown in the image.

Now, calculate bond orders:

For, [tex]O_{2}^{2-}[/tex]:  It consist of 10 bonding electrons and 8 anti-bonding electrons.

Bond order = [tex] \frac{1}{2}\times (10 - 8)[/tex]

= 1

For, [tex]O_{2}[/tex]:  It consist of 10 bonding electrons and 6 anti-bonding electrons.

Bond order = [tex] \frac{1}{2}\times (10 - 6)[/tex]

= 2

For, [tex]O_{2}^{-}[/tex]:  It consist of 10 bonding electrons and 7 anti-bonding electrons.

Bond order = [tex] \frac{1}{2}\times (10 - 7)[/tex]

= 1.5

Since, bond order is inversely proportional to bond length implies higher the bond order short will be the bond length.

Thus, order of bond length: [tex]O_{2}<  O_{2}^{-}<  O_{2}^{2-}[/tex]

Longest bond: [tex]O_{2}^{2-}[/tex]

Using Molecular Orbital theory, O22- has the longest bond, because it has the fewest bonding electrons. O2 has the strongest bond due to its highest bond order.

In molecular orbital (MO) theory, the bond length is dependent on the number of bonding electrons. The more bonding electrons, the shorter the bond. Bond strength, conversely, is related to bond order - the higher the bond order, the stronger the bond. O2 has a bond order of 2, O2- has a bond order of 1.5, and O22- has a bond order of 1. Therefore:

https://brainly.com/question/31844972

#SPJ6

Final answer:

Replacing water with a liquid with a lower specific heat in a calorimeter experiment will result in a higher final equilibrium temperature for the copper and liquid compared to if water were used.

Explanation:

When conducting an experiment in a calorimeter where a hot piece of copper is placed in a liquid to reach thermal equilibrium, the specific heat capacity of the liquid will affect the final equilibrium temperature of both substances. If the copper is submerged in a liquid with a lower specific heat than water, the liquid will reach a higher temperature than it would if water were used. This is because a liquid with a lower specific heat capacity requires less heat transfer to increase its temperature by 1°C. Accordingly, the copper would not cool down as much as it would in water because less heat is needed to warm up the liquid. Hence, the final equilibrium temperature when using a liquid with a lower specific heat will be higher than if water were used.

If the length of one side of a square is 12.0 m,  the perimeter of the square will be 48.0 meters.

A square is a shape of geometry which have four sides and the condition for the sure that all side of it must be equal to each other in length width and height and the angles between the sides must be 90 degrees.

To calculate the perimeter the length of one side must be multiplied by 4 as squares have 4 sides with it so, 12 is multiplied by 4 and the result will be 48 meters. so, the parameter of the square will be 48 meters.

Therefore, the length of one side of a square is 12.0 m, and the perimeter of the square will be 48.0 meters.

Learn more about the square, here:

https://brainly.com/question/14198272

#SPJ2

A. what are the implied charges on the ions in mg2o3?

Suppose that we have an element A with a charge “a+”, and element B with a charge “b-”. The chemical reaction would be:

A(a+) + B(b-) --> AbBa

So in this case, we can see that:

Mg has a charge of 3+ while O has a charge of 2-.

B. do these charges agree with those expected from trends in the periodic table

From the periodic table, we can see that Mg should only have a charge of 2+ and not 3+.

This might mean that Mg can take different oxidation states.