8. A cashier at Whole Foods measures the weight (mass) of fruit with an electronic scale at the register.
If the cashier accidentally leaves a pen on the scale for each measurement, would this contribute to
random error or systematic error? Explain.

The true statement about  is expert witnesses that they are required to link all evidence to the crime.

So, option C is correct.

An expert witness is described particularly in common law countries such as the United Kingdom, Australia, and the United States, is a person whose opinion by virtue of education, training, certification, skills or experience, is accepted by the judge as an expert.

Expert witnesses are required or expected to to link all evidence to the crime.

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Answer:

D. All of the above are true.

Explanation:

All the given options in the problem are true.

According to Aufbau's principle, the sublevels with lower energy are filled before those with higher energies.

The order of filling according to their energies is;

1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p

We see that the 3d energy level is lower than 4f but higher than 2s.

Also, the 3d orbital has 5 subshells and each can hold a maximum of two electrons.

This gives a capacity of 10 electrons.

Cations are positively charged ions that have fewer electrons than protons. Anions are negatively charged ions that have more electrons than protons. Mg2+ is a cation, and Cl- is an anion.

Cations are ions that have a positive charge. They are formed when an atom loses one or more electrons. Cations have fewer electrons than protons, resulting in a net positive charge. Some common characteristics of cations include:

- They are positively charged.

- They have more protons than electrons.

- They are typically formed by metals.

- They tend to be located in the left side of the periodic table.

In this case, Mg2+ is a cation. Magnesium (Mg) is a metal, and when it loses two electrons, it forms the Mg2+ cation. The loss of electrons gives it a net positive charge.

Anions, on the other hand, are ions that have a negative charge. They are formed when an atom gains one or more electrons. Anions have more electrons than protons, resulting in a net negative charge. Some common characteristics of anions include:

- They are negatively charged.

- They have more electrons than protons.

- They are typically formed by nonmetals.

- They tend to be located on the right side of the periodic table.

In this case, Cl- is an anion. Chlorine (Cl) is a nonmetal, and when it gains one electron, it forms the Cl- anion. The gain of an electron gives it a net negative charge.

To summarize, cations are positively charged ions that have fewer electrons than protons, tend to be formed by metals, and are located on the left side of the periodic table. Anions are negatively charged ions that have more electrons than protons, tend to be formed by nonmetals, and are located on the right side of the periodic table. Mg2+ is a cation, and Cl- is an anion.

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Answer: No, two atoms belonging to the same chemical element are not necessarily identical.

Explanation:

I hope that was helpful

The model above is not a true representation of the electrons within an atom of lithium because electrons are not present inside the orbitals.

Lithium is the lightest metal on Earth and, in its basic state, is soft enough to be sliced with a knife. From Brine Processing In high-elevation regions of Bolivia, Argentina, and Chile, brine reservoirs known as salars are where the majority of the lithium that is produced today is extracted. The model above is not a true representation of the electrons within an atom of lithium because electrons are not present inside the orbitals.

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Your question is incomplete but most probably your full question was,  

Why is the model above paragraph 6 not a true

representation of the electrons within an atom of lithium?

The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.

If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.

Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

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Answer:

6.460 gm  is the correct answer .

Explanation:

Given

Kate’s blood volume=\(3.8L\)

blood glucose=\(170\ mg/dL\)

As we know that

\(1\ dL= 10^{-1}\ litre\)

The \(10^{-1}\)   includes the blood glucose of the \(170\ mg/dL,\)

So \(3.8L.\) of the Kate’s blood volume  can be determined by

\(=\ \frac{170 * 3.8 }{10^{-1} }\)

\(=170 * 38 \ mg\)

\(=6460\ mg\)

To convert into the gm we have divided by the 1000

\(6.460 \ gm\)

Therefore the glucose in her blood=

\(6.460 \ gm\)

Answer:

6.460 g

Explanation:

Glucose is a simple carbohydrate molecule which circulates in the blood along with other substances. The amount of glucose is measured to treat the medical conditions of patients which is measured as mg/dL.

1 liter of liquid contains 10 deciliters therefore 1 dL will have 0.1 liter or

1 dL= 10^-1 liter (0.1)

In the given question,  

the total volume of blood = 3.8 L

1 dL of blood contains = 170 mg

3.8 L will have = (3.8 x 170)/0.1

=6460 mg

= 6.460 g

Thus, 6.460 g is the correct answer.

Answer:

water

tank

fish

Explanation:

check my question at math and answer it

The oxidation number of hydrogen increases to +1 while the oxidation number of iodine decreases to -1.

We must recall that the oxidation number of a particular atom or ion in any chemical specie is decided based on some arbitrary rules. Those rules are used to tell what the correct oxidation number of an atom should be in a compound or ion.

Firstly, the oxidation number of iodine and oxygen in the gas molecules is zero. The oxidation number of substances is not constant. However, on the right hand side, the oxidation number of hydrogen increases to +1 while the oxidation number of iodine decreases to -1.

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Answer:

true

Explanation:

Answer: True

Explanation:

I took the test :D

When measuring heat transfer, the sign of the delta T (ΔT) and the heat transfer (q) values is significant.

The negative sign indicates that the heat flow is in the opposite direction from the expected direction based on the given temperature gradient. When a negative sign is present in the delta T value or heat value, it implies that heat is being absorbed rather than being given off.  For example, when a substance absorbs heat, the temperature difference between the two regions decreases, resulting in a negative delta T value. When the surroundings absorb heat, the object's temperature drops, resulting in a negative heat value. The opposite is true for positive signs. When an object loses heat, its temperature drops, and the temperature difference between two regions increases, resulting in a positive delta T value. The heat transfer is said to be positive if heat is given off by the system to the surroundings. When heat flows from the surroundings to the system, the heat transfer is negative. The negative sign is significant since it shows that the energy flow is in the opposite direction from the expected direction based on the given temperature gradient.The amount of heat transferred by the system is proportional to the absolute value of the heat value and the delta T value.

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The chemical formula : 3HgBr₂(Mercury(II) bromide)

Given

The chemical formulas of Mercury and Bromine

Required

The appropriate chemical formula

Solution

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

The number of molecules is determined by the coefficient in front of the compound

the number of atoms is determined by the subscript after the atom and the coefficient

Three molecules⇒ coefficient = 3

one atom of Mercury ⇒Hg

two atoms of Bromine ⇒ Br₂

The chemical formula : 3HgBr₂

Answer:

are there any options for us to choose from? or is it just fill in the blank

Waves of sound energy move in the form of vibration from the source of sound energy.

Waves is a kind of disturbance that can travel through a medium from one point to another point.

Sound waves is also a type of wave in which energy is travelled from one point to another point through the vibration from the source of sound.

Hence energy travel in the form of vibration.

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Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.

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The number of moles of gas produced from the reaction of 2.00g of potassium with an excess amount of water is 0.025 moles.

The reaction of potassium with an excess amount of water is:

2K + 2H\(_2\)O \(\rightarrow\) 2KOH + H\(_2\)

To calculate the moles of hydrogen gas first we need to calculate moles of potassium in 2.00g

No. of moles = (mass) / (molecular mass)

The mass given is 2.00 g and the Molecular mass is 39.09 units

∴ No. of moles = (2) / (39.09) = 0.05

From the above reaction, we get that 2 moles of potassium give 1 mole of hydrogen gas. Thus, 0.05 moles of potassium gives 0.025 moles of hydrogen gas.

Therefore, the no. of moles of hydrogen gas produced is 0.025 moles.

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The question is missing. Here is the complete question.

Which balanced redox reaction is ocurring in the voltaic cell represented by the notation of \(Al_{(s)}|Al^{3+}_{(aq)}||Pb^{2+}_{(aq)}|Pb_{(s)}\)?

(a) \(Al_{(s)}+Pb^{2+}_{(aq)} ->Al^{3+}_{(aq)}+Pb_{(s)}\)

(b) \(2Al^{3+}_{(aq)}+3Pb_{(s)} -> 2Al_{(s)}+3Pb^{2+}_{(aq)}\)

(c)\(Al^{3+}_{(aq)}+Pb_{(s)} ->Al_{(s)}+Pb^{2+}_{(aq)}\)

(d) \(2Al_{(s)}+3Pb^{2+}_{(aq)} -> 2Al^{3+}_{(aq)}+3Pb_{(s)}\)

Answer: (d) \(2Al_{(s)}+3Pb^{2+}_{(aq)} -> 2Al^{3+}_{(aq)}+3Pb_{(s)}\)

Explanation: Redox Reaction is an oxidation-reduction reaction that happens in the reagents. In this type of reaction, reagent changes its oxidation state: when it loses an electron, oxidation state increases, so it is oxidized; when receives an electron, oxidation state decreases, then it is reduced.

Redox reactions can be represented in shorthand form called cell notation, formed by: left side of the salt bridge (||), which is always the anode, i.e., its half-equation is as an oxidation and right side, which is always the cathode, i.e., its half-equation is always a reduction.

For the cell notation: \(Al_{(s)}|Al^{3+}_{(aq)}||Pb^{2+}_{(aq)}|Pb_{(s)}\)

Aluminum's half-equation is oxidation:

\(Al_{(s)} -> Al^{3+}_{(aq)}+3e^{-}\)

For Lead, half-equation is reduction:

\(Pb^{2+}_{(aq)}+2e^{-} -> Pb_{(s)}\)

Multiply first half-equation for 2 and second half-equation by 3:

\(2Al_{(s)} -> 2Al^{3+}_{(aq)}+6e^{-}\)

\(3Pb^{2+}_{(aq)}+6e^{-} -> 3Pb_{(s)}\)

Adding them:

\(2Al_{(s)}+3Pb^{2+}_{(aq)} -> 2Al^{3+}_{(aq)}+3Pb_{(s)}\)

The balanced redox reaction with cell notation \(Al_{(s)}|Al^{3+}_{(aq)}||Pb^{2+}_{(aq)}|Pb_{(s)}\) is

\(2Al_{(s)}+3Pb^{2+}_{(aq)} -> 2Al^{3+}_{(aq)}+3Pb_{(s)}\)

The redox reactions is balanced as by adding coefficients as follows:2 H+ +ClO²⁻+I⁻⟶2 Cl⁻+H₂O+I₂.

Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.

While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.These too are balanced by adding coefficients.

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There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.

The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.

Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:

Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)

Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2

Moles of Al3+ = 0.84 mol Al3+

Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.

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The performance of a laboratory technician in a blood bank is crucial as it directly impacts the quality of the blood products and patient safety. If there are five problems with a technician's work performance in the first year of work, it can have serious consequences for the blood bank's operations.

Some of the potential problems that may arise include:

Improper labeling of blood products: This can result in confusion and incorrect transfusions.

Mishandling of blood products: This can lead to contamination, spoilage, or improper storage, which can affect the quality of the blood products.

Failure to follow standard operating procedures: This can result in errors, deviations from protocols, and potential safety hazards.

Poor communication skills: This can result in misunderstandings, delays, and errors in documentation.

Inadequate training or knowledge: This can lead to mistakes, misinterpretation of test results, and failure to recognize potential problems.

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Answer:

3.34 M

Explanation:

Step 1: Given data

Step 2: Calculate the moles of acetic acid

The molar mass of acetic acid is 60.05 g/mol.

100 g × 1 mol/60.05 g = 1.67 mol

Step 3: Calculate the molarity of acetic acid

The molarity is equal to the moles of solute divided by the liters of solution.

M = n/V

M = 1.67 mol/0.5000 L = 3.34 M

Answer:

The reactions that might ensue are

Cl\(_{2}\)(g) + H\(_{2}\)O ----------  > HOCl + HCl

 HOCl -------- > \(H^+\)(aq) + O\(CI^-\)(aq)

Cl2(g) + \(OH^-\)(aq) ----- > O\(CI^-\)(aq) + HCl

Explanation:

The Disinfectant Given is

CI2 (g) at PH 9

Determine the chemical reactions that might ensue

due to the High concentration of \(H^{+} (aq)\) the formation of \(OCI^-\)(aq) will be better and this will decrease the power of the disinfectant.

Hence the chemical reactions that might ensue can be represented below as :

Cl\(_{2}\)(g) + H\(_{2}\)O ----------  > HOCl + HCl

            HOCl -------- > \(H^+\)(aq) + O\(CI^-\)(aq)

Cl2(g) + \(OH^-\)(aq) ----- > O\(CI^-\)(aq) + HCl

Answer:

Accuracy is the degree of closeness to true value.

Precision is the degree to which an instrument or process will repeat the same value.

Hope it helps....

Answer:

Accuracy and precision are alike only in the fact that they both refer to the quality of measurement, but they are very different indicators of measurement. Accuracy is the degree of closeness to true value. Precision is the degree to which an instrument or process will repeat the same value

Answer:

a physical change does not change the composition (what it's made of) as a chemical change would.

Physical changes are differentiated from the chemical changes by means  of the state of the substance which is obtained after the change.

Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.

Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.

They involve only rearrangement of atoms and are often characterized to be changes which are reversible.

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Answer:

D. Two scientists may have different underlying assumptions that lead them to different conclusions about the same thing.

Explanation:

It's all about how a person analyzes data. Some do it mathmatically while others do it logically. By doing it different ways, you may still come to the same conclusion, despite working at the problem in a different way.

Answer: Solubility increases so more solute dissolves

Explanation:

The solubility is a measure of the concentration of the dissolved gas particles in the liquid and is a function of the gas pressure. As you increase the pressure of a gas, the collision frequency increases and thus the solubility goes up, as you decrease the pressure, the solubility goes down.