if maria runs at a speed of 2 m/s, how far will she run in 60 seconds

Answer:

Applied science is a discipline that is used to apply existing scientific knowledge to develop more practical applications, for example: technology or inventions. In natural science, basic science (or pure science) is used to develop information to explain phenomena in the natural world.

Answer:

• Because engineers apply science and its theories into practical situation

Take an example of;

→ A generator: When creating a generator, electromagnetic induction theorem is applied. [ self and mutual inductance ]

→ A plane: The wings are made in considerance of Bernoulli principle and viscous drag

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Answer:

D. 114 g

Explanation:

The structure that best fits the given data is 1,4-dibromobenzene.

The presence of two methyl singlets in the proton NMR spectrum indicates the presence of two methyl groups in the compound. This suggests the presence of a substituent attached to the benzene ring.

The proton-decoupled 13C NMR spectrum displays six peaks, indicating the presence of six distinct carbon environments. In 1,4-dibromobenzene, there are two carbon atoms attached to the methyl groups, which gives two peaks. The benzene ring itself has four unique carbon environments, each with a different chemical shift, resulting in four additional peaks.

The structure of 1,4-dibromobenzene matches the data because it contains two methyl groups and displays a total of six peaks in the proton-decoupled 13C NMR spectrum, consistent with the given information.

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Answer: 192 over 77 Ir

Explanation:

Iridiums atomic mass is 192.217 and to get 192 you would add both protons and neutrons to get the atomic mass. When writing in isotope notation, the mass goes on top.

Answer: 2Cr + 3Br2 Yields 3CrBr3

Explanation:

We know that 4a is not balanced because there are 3 Nitrogen atoms on the reactants side and 2 on the products side.

We know that 4c is not balanced because there are 4 Chlorine atoms on the reactants side and 2 on the products side. (Remember there are 2 Cl2 atoms. Therefore, 2 times 2 means there are 4 Chlorine atoms on the reactants side)

Finally, we know the answer is not 4d because there is 1 Potassium on the reactants side and 2 potassiums on the products side.

Therefore, the answer must be 4b, which contains 2 Chromium atoms and 6 bromine atoms on each side

The answer is 3. No, because this fragment does not contain the bromine atom.

In mass spectrometry, fragmentation occurs when a molecule is bombarded with high-energy electrons, causing it to break apart into smaller fragments. The fragment appearing at m-15 indicates the loss of a methyl group (CH3) from the molecular ion. Since the fragment does not contain the bromine atom, it would not contribute to a signal at m-13, which would correspond to the loss of a hydrogen atom (H) from the molecular ion. Therefore, we would not expect a signal at m-13 that is equal in height to the m-15 peak.

In mass spectrometry, the molecular ion peak (M+) corresponds to the intact molecular ion with the highest mass-to-charge ratio (m/z). Fragments are generated through the cleavage of chemical bonds within the molecule. The m/z value of a fragment peak corresponds to the mass of the fragment divided by its charge. In this case, the molecular ion peak at m/z = 150 suggests a molecule with a mass of 150 atomic mass units (amu) and a single positive charge. The presence of a fragment peak at m-15 indicates the loss of a methyl group (CH3) from the molecular ion. However, the fragment at m-15 does not contain the bromine atom since the bromine atom is still attached to the main carbon chain. Therefore, a signal at m-13, which would correspond to the loss of a hydrogen atom (H) from the molecular ion, would not be expected to be equal in height to the m-15 peak because it does not contain the bromine atom.

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The dot and cross diagram is a way of representing a molecule along with its valence electrons and respective bonds. Valence electrons are drawn as a dot or a cross, each element will have a different connotation. Around the atoms, circles are drawn that indicate the bonds and how the electrons are shared.

Carbon has 4 valence electrons and oxygen has 6, the dot-and-cross diagram of CO2 will be:

The reaction would tend to proceed in the reverse direction, resulting in an increase in the concentrations of \(SO_2\) and \(O_2\), and a decrease in the concentration of \(SO_3\), until equilibrium is reached.

The reaction between sulfur dioxide (\(SO_2\)) and oxygen (\(O_2\)) to form sulfur trioxide (\(SO_3\)) is an exothermic reaction. According to Le Chatelier's principle, at high temperatures the equilibrium position of an exothermic reaction shifts towards the reactants side. Therefore, the reaction would tend to proceed in the reverse direction.

The balanced chemical equation for the reaction is:

\(2SO_2(g) + O_2(g) = 2SO_3(g)\)

The initial moles of the reactants are:

n(\(SO_2\)) = 0.200 mol

n(\(O_2\)) = 0.300 mol

n(\(SO_3\)) = 0.500 mol

To determine the reaction quotient Q, we divide the product of the concentrations of the products (raised to their stoichiometric coefficients) by the product of the concentrations of the reactants (raised to their stoichiometric coefficients):

\(Q = [SO_3]^2 / ([SO_2]^2 * [O_2])\)

Substituting the initial concentrations into the expression for Q:

Q = (0.500 mol/dm^3)^2 / ((0.200 mol/dm^3)^2 x (0.300 mol/dm^3))

Q = 20.83

The reaction quotient Q is greater than the equilibrium constant Kc at 1000K for this reaction, which is around 1. Hence, the reaction is not at equilibrium and will shift in the reverse direction to reduce Q. This means that some of the sulfur trioxide will react to produce sulfur dioxide and oxygen.

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It will take 6.6hours for 85% of the lead for radioactive decay

What is radioactive decay?

Radioactive decay is the emission of power withinside the shape of ionizing radiation. The ionizing radiation this is emitted can include alpha particles, beta particles and/or gamma rays. Radioactive decay happens in unbalanced atoms known as radionuclides.

Elements withinside the periodic desk can tackle numerous bureaucracy. Some of those bureaucracy are strong; other kinds are risky. Typically, the maximum strong shape of an detail is the maximum not unusual place in nature. However, all factors have an risky shape. Unstable bureaucracy emit ionizing radiation and are radioactive. There are a few factors without a strong shape which are constantly radioactive, together with uranium. Elements that emit ionizing radiation are known as radionuclides.

\(\frac{dN}{dt} = -\lambda N\\ \\ \implies N = N_0e^{-\lambda t}\)

Since, initial amount was 1g,

\(N = (1)e^{-\lambda t} = e^{-\lambda t}\)

Half life is 3.3 hours. So,

\(\frac{1}{2} = e^{-\lambda (3.3)} \implies \lambda = \frac{\ln2}{3.3}\)

SO, after 75% decay, only 25% is left. So,

\(\frac{1}{4} = e^{-\frac{\ln2}{3.3}t} \implies t = 6.6 \ \text{hours}\)

It will take 6.6hours for 85% of the lead for radioactive decay

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Enthalpy change of Pentane (C5H12)  that burns is -3,270.5  kJ

Enthalpy change is defined as the difference in enthalpy of total products and reactants, each multiplied by the respective moles. It is expressed as ΔH°rxn

The formula for calculating the enthalpy change of a reaction is:

ΔH°rxn =∑[n x ΔH°f(product) - ∑[n x ΔH°f(reactant)]

The equilibrium reactions are:

C₅H₁₂(l) + 8O₂(g) ⇒ 5CO₂(g) +6H₂O(g)

ΔH°f(CO₂)(g) = -393.5 kJ/mol

ΔH°f(H₂O)(g) = - 241.8 kJ/mol

ΔH°f(C₅H₁₂)(l) = -146.8 kJ/mol

ΔH°f(O₂)(g) = 0 kJ/mol

The equation for the enthalpy change for the above reaction is:

ΔH°rxn =∑[n x ΔH°f(product) - ∑[n x ΔH°f(reactant)]

ΔH°rxn =∑[(n(CO₂) x ΔH°f(CO₂)) + (n(H₂O) x ΔH°f(H₂O)) ]- ∑[(n x ΔH°f(C₅H₁₂)) + (n x ΔH°f(O₂))]

ΔH°rxn =[( 5 x -393.5) + (6 x - 241.8 ) ]- [(1 x -147.8) + (8 x O₂)]

ΔH°rxn = -3,418.3 -(-147.8)

ΔH°rxn = -3,270.5  kJ

Therefore, the enthalpy of burning 1 mole of pentane is -3,270.5  kJ

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D, 67

Explanation:

1070 miles/16 hours = 66.875 miles per hour average traveling speed, which rounds up to 67.

Answer:

A.

Cu Zn K is are metals which form ionic bond with oxygen

Based on the data provided, the total energy of the reaction is 1066 kJ and the reaction is endothermic

The total energy change of a reaction is the difference between the total bond energy of the reactants and the total bond energy of the products.

Bond energy of reactants = 2000 kJ

Bond energy products = 934 kJ

Total energy of reaction = (2000 - 934) kJ = 1066 kJ

The total energy of the reaction is 1066 kJ and the reaction is endothermic.

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Answer:

does friction talks ? friction is a oppossing force tho

The positively charged center in an atom is called as Nucleus. It is made up of positively charged protons and neutral sub-atomic particle called as neutrons.

What is meant by protons ?

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Answer:

A. Rutherford and Bohr

Explanation:

I think this is right but I am not sure it has been a while since i read about them

Answer:

84130.44698 and 8.413044698*10^4

Explanation:

Chemistry => The Mole => Percent of water in a Hydrate

We have a compound that is hydrated with "n" moles of water. To determine the moles of water, what we will do is take as a base a mole of the dry compound, that is, 1 mol of Na2SO4.

We will determine the mass of one mol of the dry compound and the difference between the hydrated compound and the dry compound will be the water content.

Let's see what is the molar mass of the dry compound: Na2SO4

Element Mass

Na 2 x 22.99 =45.98 g/mol

S 1 x 32.065 = 32.065 g/mol

O 4 x 15.999 = 63.996 g/mol

Sum 142.04 g/mol

So, we have that one mol of Na2SO4 has a mass of 142.04.

Now, the water in 1 mol of the hydrated compound will be:

Now, we divide the mass obtained by the molar mass of water, 18.01 g/mol:

In the hydrated compound, we have 9 moles of H2O for each mol of Na2SO4.

Therefore the ANSWER will be B. 9

In prolonged fasting conditions acetyl-coa generated from the breakdown of amino acids and fatty acids does not enter the citric acid cycle in the liver, but acetyl-coa derived from ketone bodies can enter the citric acid cycle in the brain. Cholesterol is required in the diet.

Amino acids are chemical molecules having side chains (R groups) unique to each amino acid as well as amino and carboxylic acid (CO2H) functional groups.

Every amino acid contains the elements carbon (C), hydrogen (H), oxygen (O), and nitrogen (N) (CHON); in addition, the side chains of cysteine and methionine contain sulfur (S), while the less frequent amino acid selenocysteine has selenium (Se). As of 2020, it is known that more than 500 naturally occurring amino acids make up the monomer units of peptides, including proteins.

Despite the fact that there are only 22 proteins, 20 of them have unique specified codons, and another two have unique coding mechanisms: All eukaryotes contain selenocysteine, and pyrrolysine is also present.

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In N₂H₄ (hydrazine), each interior nitrogen atom is surrounded by three regions of electron density. out of them, two of these regions are occupied by single bonds to hydrogen atoms, while the third region is occupied by a lone pair of electrons.

This arrangement gives rise to a trigonal pyramidal molecular geometry around each interior nitrogen atom.

The lone pair repulsion causes the bonding pairs to push slightly downward, resulting in a pyramid-like shape.

The angle between the two hydrogen atoms bonded to nitrogen and the lone pair is approximately 107 degrees, deviating slightly from the ideal tetrahedral angle of 109.5 degrees.

This geometry is a result of the repulsion between the lone pair and the bonding pairs, which leads to the observed trigonal pyramidal structure of N₂H₄.

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When plane-polarized light passes through a solution of an optically active compound, it rotates the plane of polarization of the light. This phenomenon is referred to as optical rotation or rotary dispersion.

When a beam of unpolarized light passes through a solution of an optically active substance, its plane of polarization is rotated by an angle called the optical rotation angle. Optical activity is a property of a molecule's three-dimensional structure, which is why some molecules are optically active while others are not. The two isomers of a chiral molecule are enantiomers, which means they have the same physical and chemical properties but are mirror images of each other.

The optical rotation angle of each enantiomer is equal in magnitude but opposite in sign to that of the other enantiomer. When a racemic mixture of equal quantities of both enantiomers is studied, no optical rotation is observed. Because the rotations induced by each enantiomer cancel out. When plane-polarized light passes through a solution of an optically active compound, it rotates the plane of polarization of the light. This phenomenon is referred to as optical rotation or rotary dispersion. Optical rotation is defined as the rotation of the plane of polarization of linearly polarized light as it passes through a sample. The angle of rotation is determined by the molecular structure of the sample and the concentration of the sample in solution.

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One can build a solid foundation of scientific knowledge and methods for world exploration by studying the life sciences.

It will be simpler for you to decide on a career if you are aware of what is significant to you (your values), what you enjoy doing (your interests), and what you are good at (your abilities). Consider the three legs of a stool as being your values, interests, and abilities.

The life sciences are present in so many areas of our lives, including discussions about genetic testing and stem cell research, as well as health care and the environment.

Thus, studying the life sciences can help one lay a strong foundation of scientific knowledge and methodologies for exploring the world.

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Answer:

The answer is - C. Sweat, tears, skin, and mucus membranes.

Explanation:

The choice that provides the reaction's chemical equation in balance is 2HCl+Ba(OH)₂ ---->BaCl₂ +2H₂O.

A chemical reaction creates barium chloride and water when barium hydroxide is introduced to hydrochloric acid.

Let's check to see if this equation is balanced.

4 H atoms on the LHS equals 4 on the RHS.

2 chlorine atoms on the LHS equals the RHS.

1 barium atoms on the LHS, 1 on the RHS

Oxygen atoms on the LHS = 2 = RHS

As a result, this equation is balanced.

Ba(OH)₂ + HCl = BaCl2 + 2H₂O

Here, the LHS has three H atoms, whereas the RHS has four H atoms.

On the LHS, there is one chlorine atom, while there are two on the RHS.

2HCl + Ba(OH)₂ = BaH₂ + 2HCl + O₂.

Barium chloride reacts with hydrochloric acid to form barium chloride.

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The question is incomplete complete question is given below

A researcher adds barium hydroxide to hydrochloric acid to form a white-colored barium chloride. Which option gives the balanced chemical equation of the reaction?

(a) HCl + Ba(OH)₂ → BaCl₂ + 2HOH

(b) 2HCl + Ba(OH)₂ → BaCl₂ + 2HOH

(c) 2HCl + Ba(OH)₂ → BaH₂ + 2HCl + O₂

(d) HCl + 2Ba(OH) → 2BaCl₂+ 2HOH + O₂

A buffer is made from an acid - base conjugate pair as shown by option A

Buffers are often composed of weak acids and their conjugate bases (or weak bases and their conjugate acids). The weak acid can contribute a proton to balance any new base, whereas the conjugate base can absorb a proton to do so.

This balance between the acid and its conjugate base allows the buffer to survive pH changes. Buffers are essential in biological systems because many biochemical processes are particularly sensitive to pH changes.

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Answer: I believe i am correct.

Explanation: Each 2p orbital has two lobes. There is a planar node normal to the axis of the orbital (so the 2px orbital has a yz nodal plane, for instance). The higher p-orbitals ( 3p, 4p, 5p, 6p, and 7p) are more complex still since they have spherical nodes as well.

a) The study is an experimental study.

A major problem with the study is the lack of blinding.

b) The study is an observational study.

A major problem with the study is the small sample size.

a) The Physicians Health Study is an experiment because the researchers intentionally assigned participants to two groups: one receiving aspirin and the other receiving placebos.

A major problem with the study is the lack of blinding. Since the participants were aware of whether they were receiving aspirin or placebos, their knowledge could have influenced their behavior and responses, potentially introducing bias. Additionally, the study involved only male physicians, so the results may not be generalizable to other populations or genders.

b) The study described is an observational study because the researcher did not intervene or assign treatments. Instead, the researcher observed and compared existing differences in systolic blood pressure levels between male and female students.

A major problem with the study is the small sample size. With only four males and four females, the sample may not be representative of the larger population, limiting the generalizability of the findings. Additionally, the study did not specify any control or comparison group, making it challenging to draw definitive conclusions about the differences in blood pressure between genders.

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Answer:

sorry but dorks dont learn maths

Explanation:

just kidding no offense but i think umm 1st one will stay same

i searched google

Rock formations change over the years and their position within the formation helps scientists and researchers determine the age of each layer. The oldest layers are at the bottom of the structure and the newest layers are at the top.

The bottom layer of rock forms first so it is the oldest layer. All layers above are younger and the top layer is the youngest of them all. This order is relative because we cannot know exactly when each layer was formed, only that each layer is younger than the layer below it. The superposition principle shows that younger rock layers lie on top of older rock layers.

Each layer is older than the layer above it. Layer D was deposited first so it is the oldest layer because it is at the bottom. Younger rock units in the order of layers C, B, and A. Sedimentary rocks are piled on top of each other. So the youngest layer is on top of the sequence and the oldest layer is on the bottom.

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