in part one the purpose of the experiment was to setermine the molairty of your naoh solution. during th eittrstion, water was aded to khp to wash down the soldes of the flask. it dilute he concentration o khp. what is it not a concern?

The mean wake time of 104.0 min before treatment is outside the 99% confidence interval of the mean wake time after treatment, it suggests that the drug is effective. This is further confirmed by the significant decrease in the mean wake time after treatment of 94.1 min. Therefore, it can be concluded that the drug is effective in treating insomnia in older subjects.

A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 16 subjects had a mean wake time of 104.0 min.

After treatment, the 16 subjects had a mean wake time of 94.1 min and a standard deviation of 23.7 min.

Assume that the 16 sample values appear to be from a normally distributed population and construct a 99% confidence interval estimate of the mean wake time for a population with drug treatments.

The formula for the confidence interval of the mean is:

\($$\overline{X} \pm z_{\alpha/2} \frac{s}{\sqrt{n}}$$\)

Here,

\($z_{0.005} = 2.576$\) for a 99% confidence interval as

\($α/2 = 0.005$\)

and the degrees of freedom is 15 since \($n-1=15$\).

Now, substituting all the values:

\($$94.1 \pm 2.576 \times \frac{23.7}{\sqrt{16}}$$\)

The calculation gives a 99% confidence interval estimate of the mean wake time of 94.1 ± 15.4 min (rounded off to one decimal place).

The mean wake time of 104.0 min before treatment is not within the 99% confidence interval of the mean wake time after treatment. This indicates that there is a significant decrease in the mean wake time after treatment.

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Answer:

The pH of a 4.4 M solution of boric acid is 4.3

Explanation:

at t=0  cM              0             0

at eqm                    

So dissociation constant will be:

Give c= 4.4 M and  = ?

Putting in the values we get:

Also

Thus pH of a 4.4 M  solution is 4.3

Answer:

Solarpannels? I honestly don't know I'm just trying to be helpful.

Answer:

the second object had a weaker charge

Explanation:

the charged object had a stronger charge and opposite to that of the uncharged hence causing attraction

Answer:

d

Explanation:

The second object had a weaker charge.

Answer:

Explanation:

A mutation in the DNA results in a change in the mRNA and, ultimately, to a different protein structure.

Answer:

A mutation in the DNA results in a change in the mRNA and, ultimately, to a different protein structure. The DNA sequence found within a gene controls protein synthesis. If the DNA sequence is altered, this can alter the amino acid sequence within a protein

Explanation:

Your DNA is the blueprint used to make proteins. Your DNA is used to make a strand of mRNA (Messenger RNA.) This is sent to a ribosome where it is read. The codons in the mRNA instruct the ribosome which amino-acid to attach to the end of the protein chain and when to let it go.  

If your DNA mutates then the mRNA copied from it will be different. When that gets to the ribosome the effect depends on just what the altered codon(s) are. The ribosome will blindly follow the instructions it has been given. This might be to add a different amino-acid to the chain or to prematurely release it.

It is not possible to calculate the molarity of oxygen in water based on the given information.

To calculate the molarity of a solute in a solution, we need to know the number of moles of the solute and the volume of the solution.The problem statement provides the volume of oxygen gas (1.75 L) but does not provide information on the number of moles of oxygen gas or the volume of water.

Additionally, we would need to know if any oxygen gas has actually dissolved in the water to form a solution.Therefore, we cannot calculate the molarity of oxygen in water based on the given information.

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Answer:

has very different properties from sodium and chlorine

Explanation:

We know that salt (chemical name: Sodium Chloride) is made from two elements, Sodium (Na) and Chlorine (Cl). But the properties of the compound of sodium and chlorine has completely different properties than those of its elements: Sodium and Chlorine.

Sodium is quite a low density but highly reactive silvery white metal and Chlorine is a highly reactive greenish yellow gas. While salt (NaCl) is a crystalline material, white in color, which readily dissolves in water and is used as a condiment to add flavor to food.

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Answer:

B: 1s²2s²2p¹

Na: 1s²2s²2p⁶3s¹

Explanation:

A = 2

B = 1

C = 2

D = 6

E = 1

Answer:Dmitri Mendeleev

Explanation:

Answer:

The answer should be A. the mechanism will provide defense against many different types of pathogens :)

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Answer:

sodium, rubidium, caesium, francium

Explanation:

all are group I elements, so they have the similar properties

Answer:

N> As> Ga

Explanation:

There are two important factors that come into play when we are discussing the strength of attraction between protons and valence electrons;

1) distance of the valence electrons from the nucleus

2) size of the nuclear charge

If we consider the elements; nitrogen, arsenic and gallium, nitrogen is in period 2. This implies that it has only two shells. The valence electrons are closer to the nucleus and are more strongly attracted to the protons in the nucleus.

Arsenic and gallium are both in period 4. This implies that they both contain a total of 4 electron shells. However, arsenic has a nuclear charge of 33 protons while gallium has a nuclear charge of 31 protons. Hence arsenic has a greater size of nuclear charge than gallium. The attraction between protons and valence electrons in arsenic is therefore greater than it is in gallium.

Answer:

2m/s

Explanation:

2meters/second

The chemical symbol for the element that makes up most of Earth's core is Fe, which stands for iron. Iron makes up approximately 85% of the Earth's core, with the remainder being nickel and other trace elements.

The high abundance of iron in the Earth's core is responsible for the planet's magnetic field, which is essential for life on Earth as it helps to protect us from harmful solar radiation. The study of the Earth's core and its composition is important for understanding the planet's history and evolution, as well as for predicting future changes in the Earth's magnetic field. The element that makes up most of Earth's core is iron. Its chemical symbol is Fe, which is derived from the Latin word "ferrum." Iron is the primary component of the inner and outer core, accounting for about 85% of its composition. This element plays a vital role in Earth's geophysics, including the generation of the planet's magnetic field.

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mesoderm is the  muscle bone urinary tract and the kidneys.

The double replacement reaction generally results in the formation of precipitate. Here the products of the given reaction are CaCl₂ and H₂O and the ionic solution is CaCl₂.

The chemical reaction in which two chemical substances react by exchanging the ions to form two new molecules. In this reactions, positive ions exchange negative ions. A double displacement is also called the double decomposition reaction.

In general the reaction can be given as:

AB + CD → AD + CB

The reaction of Ca (OH)₂ with HCl is:

Ca (OH)₂ + 2HCl → CaCl₂ + 2 H₂O

Thus here the given reaction is double displacement, CaCl₂ is the ionic compound and other compound is water.

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Answer:

It would take approximately 81.65 kJ (or 81,650 J) of heat to convert 230.0g of ice at -10C to water at 0C.

Explanation:

To calculate the amount of heat needed to convert ice at -10°C to water at 0°C, we need to consider two steps:

1. Heating the ice from -10°C to 0°C (heat required to raise the temperature of ice)

2. Melting the ice into water at 0°C (heat required to change the state of ice)

Let's first calculate the heat required for step 1:

Q1 = m × c × ΔT

where Q1 is the heat required, m is the mass of the ice, c is the specific heat capacity of ice, and ΔT is the change in temperature.

The specific heat capacity of ice is 2.09 J/g°C, and ΔT is (0°C - (-10°C)) = 10°C.

So, Q1 = 230.0 g × 2.09 J/g°C × 10°C = 4827 J

Now, let's calculate the heat required for step 2:

Q2 = m × Lf

where Q2 is the heat required, m is the mass of the ice, and Lf is the latent heat of fusion of ice.

The latent heat of fusion of ice is 334 J/g.

So, Q2 = 230.0 g × 334 J/g = 76820 J

Therefore, the total amount of heat needed to convert 230.0g of ice at -10C to water at 0C is:

Qtotal = Q1 + Q2 = 4827 J + 76820 J = 81647 J

Therefore, it would take approximately 81.65 kJ (or 81,650 J) of heat to convert 230.0g of ice at -10C to water at 0C.

Answer:

polar zone - the part of the Earth's surface forming a cap over a pole; characterized by frigid climate. Frigid Zone, polar region. climatic zone - any of the geographical zones loosely divided according to prevailing climate and latitude.

Explanation:

The polar regions, also called the frigid zones, of Earth are the regions of the planet that surround its geographical poles, lying within the polar circles.

The electron group geometry of the carboxyl carbon in a carboxylate ion is tetrahedral. The hybridization state of the carbon is sp3.sp3. Therefore, the correct answer is (b) tetrahedral, sp3.

The electron group geometry and hybridization state of the carboxyl carbon in a carboxylate ion is: Trigonal planar, sp2

The concept of hybridization is defined as the process of combining two atomic orbitals to create a new type of hybridized orbitals. This intermixing typically results in the formation of hybrid orbitals with completely different energies, shapes, and so on. Hybridization is primarily carried out by atomic orbitals of the same energy level. However, both fully filled and half-filled orbitals can participate in this process if their energies are equal. The concept of hybridization is an extension of valence bond theory that helps us understand bond formation, bond energies, and bond lengths.

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Answer:

CO2 is classified as a compound

Explanation:

To combine ions to form ionic compounds, we need the combine in such a way that it gets neutral charge.

We can combine each anion with each cation to get the 4 compounds we need.

To combine SO₄²⁻ with Pb⁴⁺ we first find the Least Common Multiple of their charges, 2 and 4.

They have the factor 2 in common, so the LCM is 4. This is the final charge of each that will cancel out.

To get 4+, we only need 1 Pb⁴⁺.

To get 4-, we need 2 SO₄²⁻.

So, the formula is:

Pb(SO₄)₂

To combine SO₄²⁻ with NH₄⁺ is easier because one of them has single charge. In this case, we can simply pick one of the multiple charge ion and the same amount that will cancel its charge of the single charged one.

So, we picke 1 SO₄²⁻, ending with 2-.

And we picke 2 NH₄⁺, ending with 2+.

The formula:

(NH₄)₂SO₄

To combine C₂H₃O₂⁻ with Pb⁴⁺ we do the same, because the anion is single charged.

Pick 1 Pb⁴⁺, ending with 4+.

Pick 4 C₂H₃O₂⁻, ending with 4-.

The formula:

Pb(C₂H₃O₂)₄

To combine C₂H₃O₂⁻ with NH₄⁺, both have same charge, so we just need one of each and their charges will cancel out.

The formula:

NH₄C₂H₃O₂

So, the formulas are:

Pb(SO₄)₂

(NH₄)₂SO₄

Pb(C₂H₃O₂)₄

NH₄C₂H₃O₂

Answer:

Explanation:

The number of atoms can be found by using the formula

N = 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 = 0.552 × 6.02 × 10²³

We have the final answer as

Hope this helps you

The outer shell of electrons is full, so there is no need to gain or lose electrons.

The hydrogen and oxygen atoms are more stable in water molecules as they get a complete valence shell when they bonded with other atoms.

In a chemical reaction, two or more reactants react with each other under the chemical condition to form two or more products. The Chemical reaction is defined as a reaction two or more reactant components react with each other to form two or more products.

The water is formed by reacting hydrogen and oxygen. The chemical reaction of water formation is shown below.

\(H_2(g)+O_2(g)\longrightarrow H_2O(l)\)

The balanced chemical equation can be defined as a reaction where the number of moles of reactants is equal to the number of moles of products.

\(H_2(g)+ \frac{1}{2}O_2(g)\longrightarrow H_2O(l)\)

The hydrogen atoms have one electron and the oxygen has two electrons less than the complete valence shell. But in the water molecule, every atom has a complete valence shell so atoms become more stable.

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Answer:

Rare.

Explanation:

Answer:20 atm

Explanation:

Answer:

The kinetic theory of matter can be used to explain how solids, liquids and gases are interchangeable as a result of increase or decrease in heat energy. If it is cooled the motion of the particles decreases as they lose energy.

Explanation:

Answer: Burger king

Explanation: Yes

Answer:

A: More liquid water molecules will change to water vapor until a new equilibrium is reached.

Explanation:

I'm not good at explaining but I took the quick check and this answer was correct b)

The increase in liquid water thus results in the more formation of water vapor, for reaching new equilibrium. Thus, option A is correct.

Equilibrium is the condition of the equal concentration of the product and reactant in the chemical equation. The reaction at equilibrium has constant rate.

The increase in the concentration of the product or reactant results in the distortion of the equilibrium condition, and the reaction will be processes in the forward or backward direction, according to equilibrium principle.

The addition of liquid water molecules to the reaction results in the increase in the concentration of the reactants. The reaction starts approaching the equilibrium until the concentration of liquid water, and gaseous water become same.

The increase in liquid water thus results in the more formation of water vapor, for reaching new equilibrium. Thus, option A is correct.

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Answer:

(1s)^2 (2s)^2 (2p)^3

Explanation:

Nitrogen has 7 electrons. Hence, the structure will be,

=>(1s)^2 (2s)^2 (2p)^3

Hope it helps:)

The electronic configuration is used to explain the orbitals of an atom and it helps to determine the physical and chemical properties of the elements. The electronic configuration of Nitrogen is 1s² 2s² 2p³. The correct option is B.

The distribution of electrons in the atomic orbitals is given by the electronic configuration. It is a standard notation in which all the electrons holding atomic subshells are arranged in a sequence. Each element has a unique electronic configuration.

The electronic configuration of an element can be written in two ways, in standard notation, and in condensed form. In the case of elements with larger atomic numbers, the electronic configuration becomes lengthy in standard notation. So in such cases condensed form is generally used.

The electronic configuration of 'N' of atomic number 7 in standard form is 1s² 2s² 2p³ and in condensed form it is [He] 2s²2p³.

Thus the correct option is B.

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Using only maps, scientists observed several lines of evidence that led them to theorize that the continents were once joined together before there was evidence from rocks and fossils.

One key observation was the remarkable fit between the coastlines of different continents, such as South America and Africa. They noticed that the shapes of these continents seemed to match like puzzle pieces, suggesting they were once connected.

Additionally, scientists observed similar geological features across continents, such as mountain ranges and rock formations, that extended across apparent continental boundaries. They also noticed the distribution of certain plant and animal species that were found on different continents but had no means of natural dispersal.

These observations, made solely through maps, led scientists to propose the concept of continental drift, which was later supported by geological and paleontological evidence found in rocks and fossils.

Therefore, using only maps, scientists observed several lines of evidence that led them to theorize that the continents were once joined together before there was evidence from rocks and fossils.

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