Question: Can a penny dropped from a building kill a pedestrian below?


Hypothesis:


Controls:


Independent variable:


Dependent variable:


Conclusion:

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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The median of the following set of data (39.8, 39.6, 39.2, 39.6 and 39.5) is 39.6.

Median is a number separating the higher half from the lower half of a data sample, population, or probability distribution.

The median of a finite list of numbers can be found by arranging all the observations from lowest value to highest value and picking the middle one (e.g., the median of {3, 3, 5, 9, 11} is 5.

The following set of data was given this question;

39.8, 39.6, 39.2, 39.6 and 39.5

We arrange these data as follows:

39.2, 39.5, 39.6, 39.6, 39.8

The middle number or median is 39.6

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Answer:

A. last  F first E second C thrid b foruth A five

Explanation:

while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

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Answer:

Explanation:

We can see that this picture can be used to show Ohm's Law graphically so it illustrates Ohm's  Law.

According to Ohm's Law electric current is directly proportional to voltage and inversely proportional to resistance.

Mathematically, V ∝ I,

or                       V=IR,

where,       V  ⇒ voltage difference between two points,

                 I  ⇒ current flowing through the resistance,

                 R ⇒ proportionality constant or resistance.

According to the picture voltage ( SI unit Volt ) is supporting the current  ( SI unit Ampier ) to move out from the barrier while the resistor ( SI unit Ohm )is acting as a barrier to its way . As it is satisfying the Ohm's Law it illustrates the relationship between voltage, current, and resistance.

Answer:

sharp clever bright

Explanation:

s

Answer:

will you friend me please

Due to the nature of the reactants and the balanced chemical equations, the calculated solutions will be acidic, neutral, and neutral, respectively.

Neutrality is represented by 7 on the scale, which ranges from 0 to 14. pH levels below 7 signify acidity, whereas pH values over 7 suggest baseness. The pH scale is really used to determine how much free hydrogen and hydroxyl ions are present in water.

This process of neutralising acid is known as. A basic solution goes away from being basic and towards the middle of the pH scale when an acid is introduced. It is known as neutralising.

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There are 3.44 x 10^{22} particles in 0.057 moles of lithium bromide.

The lithium bromide formula also known as the lithium monobromide formula or Bromo lithium formula is explored. It is a counterion bromide-based salt of lithium.

we have to use Avogadro's constant,

Avogadro's constant, is approximately equal to 6.022 x 10^{22} particles per mole.

we can use the following formula:

number of particles = moles x Avogadro's constant

Substitute the values,

number of particles = 0.057 moles x 6.022 x 10^{23} particles/mol

Simplifying the equation

number of particles = 3.44 x 10^{22} particles

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The volume of the acid that we are going to need in this case is 27000 mL.

We know that we have to know the reaction equation as this is the first step to solve the problem that we have here;

We know that;

CaCO3 + 2HCl → CaCl2 + H2O + CO2

Then we have that;

Molarity of the acid = Antilog (-1.55)

= 0.028 M

Number of moles of the base;

38 g/100 g/mol

= 0.38 moles

If 1 mole of the base reacts with 2 moles of the acid;

0.38 moles of the base reacts with 0.38 * 2/1

= 0.76 moles

Then;

Number of moles = Concentration * volume

Volume = Number of moles/Concentration

= 0.76/ 0.028

= 27 L or 27000 mL

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The student needs to add approximately 83.3 mL of 12 M HCl solution to the existing 1 L of 2 M HCl solution to increase the concentration to 3 M. It is important to handle concentrated acids with caution and follow proper safety procedures.

To increase the concentration of a 1 L solution of 2 M HCl to 3 M, the student needs to calculate the volume of concentrated HCl needed and add it to the existing solution. Here's how the calculation can be done:

Given:

Initial concentration of HCl solution = 2 M

Final concentration desired = 3 M

Initial volume of HCl solution = 1 L

Step 1: Calculate the moles of HCl in the initial solution.

Moles of HCl = Initial concentration × Initial volume = 2 M × 1 L = 2 moles

Step 2: Calculate the moles of HCl needed for the desired concentration.

Moles of HCl needed = Final concentration × Final volume = 3 M × 1 L = 3 moles

Step 3: Calculate the moles of HCl to be added.

Moles of HCl to be added = Moles needed - Moles present = 3 moles - 2 moles = 1 mole

Step 4: Convert the moles of HCl to the required volume of concentrated HCl.

To calculate the volume, we need to know the concentration of the concentrated HCl solution. Assuming it is 12 M, we can use the following formula:

Volume of concentrated HCl = Moles of HCl to be added / Concentration of concentrated HCl

Volume of concentrated HCl = 1 mole / 12 M = 0.0833 L or 83.3 mL

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Answer:

1.67 ×10^-24g

Explanation:

counting from the first digit after the point till I got to the first non zero digit

Answer:

d

Explanation:

took test

Answer:

W = deltaKE = One half times m times quantity v Subscript f Baseline Superscript 2 Baseline negative v Subscript i Baseline Superscript 2 Baseline.

Answer is D on edge 2020

Explanation:

I took the quiz

1. Only region 5 has the chemical in the gas phase.

2. Region 2 contains the material in both the liquid and solid phases.

3. Just the liquid phase of the chemical is present in this area.

4. The temperature in region 2 is the melting point.

5. The temperature in area 4 is the boiling point.

A process known as melting or fusing is one in which the phase transitions from a solid to a liquid state while maintaining a constant temperature.Freezing: It is a type of process in which the phase transforms from liquid state to solid state at constant temperature. Evaporation is a process when the phase transitions from a liquid to a gaseous state while maintaining a constant temperature. Condensation : It is a type of process in which the phase shifts from gaseous state to liquid state at constant temperature.A process known as sublimation occurs when a substance goes directly from its solid to its gaseous form at a fixed temperature.

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Answer:

b or c but I would just pick c

Answer:

C

Explanation:

Sun is an energy source not a matter.

Answer:

14g of Y to form the compound XY₂

Explanation:

In the compound XY, you have 1 mole of X and 1 mole of Y. Thus, you can imagine the molar mass of X is 2g/mol and molar mass of Y is 7g/mol.

Now, in the compound XY₂, you have 1 mole of X but 2 moles of Y.

If you have 2g of X, in this case you will need:

2 moles Y * (7g / mol) =

14g of Y to form the compound XY₂

The amount of element Y needed to form compound XY2 is; 14g of element Y.

From the law of conservation of mass which states that;

Matter can never be created nor destroyed.

By stoichiometry;

Since:

7 g of element Y to form compound XY(y =1)

a g of element Y to form compound XY2(y =2)

In essence,

a g = (2 × 7g)/1

a = 14g

Therefore, 14g of element Y is needed to form compound XY2.

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Answer:

acid base reaction cuz no is base and h2o is none and hno3

Answer:

The action is acceleration and the reaction is friction

Answer:

A

Explanation:

Answer:

C.it has a lower melting temperature

Explanation:

A good way to solve this problem may be to think about a simple ionic compound, such as salt, NaCl:

Answer:

3.6

Explanation:

subtract both numbers!

Answer:Approx....

8

⋅

g

⋅

m

L

−

1

....

Explanation:

ρ

,

density

=

Mass

Volume

=

28.5

⋅

g

(

49.10

−

45.50

)

⋅

m

L

=

7.92

⋅

g

⋅

m

L

−

1

....

Explanation:

Answer:

207g

Explanation:

207.2 to be more specific

Answer:

             0.1608 mol/L

Explanation:

Calculate moles as,

Mole = Mass/M.Mass

Mole = 31.4 g / 78.045 g/mol

Mole = 0.402 mol

Now,

Molarity = Moles / Vol. in L

Molarity = 0.402 mol / 2.5 L

Molarity = 0.1608 mol/L

Answer:

a)decanting,filtering,and evaporating.

a

a decanting filtering evaporating

Answer:

Copper monobromide.

Explanation:

To name the compound, we shall determine the oxidation number of copper in CuBr. This can be obtained as follow:

Br = –1

Cu =?

CuBr = 0

Cu + (–1) = 0

Cu – 1 = 0

Collect like terms

Cu = 0 + 1

Cu = +1

Thus, oxidation number of copper in CuBr is +1.

Therefore, the name of the compound is copper (I) bromide or copper monobromide

The volume of 0.205 M K3PO4 solution necessary to completely react with 114 mL of 0.0118 M NiCl2 solution is 0.00437 L or 4.37 mL

The given chemical equation shows that two moles of K3PO4 react with three moles of NiCl2 to form one mole of Ni3(PO4)2 and six moles of KCl. Thus, the stoichiometric ratio of K3PO4 to NiCl2 is 2:3.

To calculate the volume of K3PO4 solution required to completely react with 114 mL of 0.0118 M NiCl2 solution, we need to use the concept of stoichiometry and the equation of concentration, C = n/V, where C is the concentration in moles per liter (M), n is the amount in moles, and V is the volume in liters.

First, we can calculate the amount of NiCl2 in 114 mL of 0.0118 M solution:

n(NiCl2) = C × V = 0.0118 M × 0.114 L = 0.0013452 mol

Next, we can use the stoichiometric ratio to calculate the amount of K3PO4 required:

n(K3PO4) = (2/3) × n(NiCl2) = (2/3) × 0.0013452 mol = 0.0008968 mol

Finally, we can use the equation of concentration to calculate the volume of 0.205 M K3PO4 solution required:

V(K3PO4) = n(K3PO4) / C(K3PO4) = 0.0008968 mol / 0.205 M = 0.00437 L

Therefore, the volume of 0.205 M K3PO4 solution necessary to completely react with 114 mL of 0.0118 M NiCl2 solution is 0.00437 L or 4.37 mL (to three significant figures).

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Dissolve 60g of potassium bromide in 340g of water to produce 15% (mass/mass) aqueous solution of potassium bromide.

Here we have to prepare a total of 400 g of solution. Aqueous solution means the solvent we use here is water.

So to prepare 400 g of 15% aqueous solution of potassium bromide, we need to find out how many grams of potassium bromide need to be dissolved in water and how many grams of water must be used.

Here the weight percent is given, that is 15%

       15/100 = weight of potassium bromide/ 400 g

       0 .15      = weight of potassium bromide / 400

      weight of potassium bromide needed = 0.15 × 400

                                                                       =  60 g

So, we calculated the required amount of potassium bromide as 60 grams. The total weight of the solution to be made is 400 grams.

So amount of water required = 400 - 60

                                                =  340 g

So we need to mix 60 grams of potassium bromide in 340 grams of water to get a 15% (mass/mass) aqueous solution.

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The materials which allow electrons to flow through them are Semiconductors and conductors. Hence Option (B) is correct.

A conductor, or electrical conductor, is a substance or material that allows electricity to flow through it.

In a conductor, electrical charge carriers, usually electrons or ions, move easily from atom to atom when voltage is applied.

Therefore, The materials which allow electrons to flow through them are Semiconductors and conductors. Hence Option (B) is correct.

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Answer:semiconductors and conductors

Explanation:

Answer:

Explanation:

We can use the equation to find out

E = mc△T

E is the total energy (calories) needed, m for mass, c for specific heat capacity and △T for the temperature change.

Substitute the numbers given

E = 500 x 1 x 10

E =5000

Therefore the answer is 5000CalWe can use the equation to find out

E = mc△T

E is the total energy (calories) needed, m for mass, c for specific heat capacity and △T for the temperature change.

Substitute the numbers given

E = 500 x 1 x 10

E =5000

Therefore the answer is 5000Cal