Determine whether or not the equation below is balanced. If it isn’t balanced, write the balanced form. Also, identify the reactant(s) and product(s) in this equation. Finally, label this as one of the five types of reactions: combination, decomposition, substitution, double replacement, or reversible.
Zn+HCl→ZnCl2+H2
2. Determine whether or not the equation below is balanced. If it isn’t balanced, write the balanced form. Also, identify the reactant(s) and product(s) in this equation. Finally, label this as one of the five types of reactions: combination, decomposition, substitution, double replacement, or reversible.
S8+24F2→8SF6
3. Calculate the molecular mass of ferric oxide (Fe3O4).
4. Determine the percentage composition of chlorine in CaCl2.
5. Identify the labeled parts in the figure.
i. Which of the labeled parts is a chemical symbol?
ii. Which of the labeled parts is a coefficient?
iii. Which of the labeled parts is the number of atoms of the element?
iv. Which of the labeled parts indicates that only one atom of the element is present in the substance?
1. The equation is not balanced. The balanced equation is: Zn + 2HCl → ZnCl₂ + H₂. Type of reaction is Substitution.
2. The equation S₈+24F₂→8SF₆ is balanced. The Type of reaction is Combination
3. The molecular mass of ferric oxide (Fe₃O₄) is 231.55 g/mol
4. The percentage composition of chlorine in CaCl₂ is 63.88%.
How do we solve for molecular mass and percentage composition?To calculate the molecular mass of ferric oxide (Fe₃O₄)
Molecular mass of Fe₃O₄ = (3 × atomic mass of Fe) + (4 × atomic mass of O)
3 × 55.85 g/mol + 4 × 16.00 g/mol
= 231.55 g/mol
To find the percentage composition of chlorine in CaCl2,
Molecular mass of CaCl₂ =
40.08 g/mol + 2 × 35.45 g/mol
= 110.98 g/mol
70.90 g/mol / 110.98 g/mol × 100
= 63.88%
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1. The equation isn't balanced because there aren't equal numbers of hydrogen or chlorine atoms on both sides of the equation. To correct this, a coefficient of 2 must be placed in front of HCl on the left-hand side of the equation.
ZN + 2HCI → ZnCl2 + H2
Zn and 2HCl are the reactants; ZnCl2 and H2 are the products. This is a substitution reaction because a free element (Zn) replaces another element (H) in a compound.
2. This is a balanced equation because the same types of atoms and the same numbers of each atom are present on both sides of the equation. 8 S atoms are found on both sides of the equation, and 48 F atoms are found on both sides of the equation. S8 and 24F2 are the reactants; 8SF6 is the product. This is a combination reaction because two substances (S8 and 24F2) undergo a chemical union to form a more complex substance (8SF6).
S8 + 24F2 → 8SF6
3. In ferric oxide (Fe3O4), there are 3 atoms of iron (Fe) and 4 atoms of oxygen (O). From the Periodic Table of Elements, we know that the atomic mass of iron is 55.8457 and the atomic mass of oxygen is 15.9994.
Fe3 = 55.8457 × 3 = 167.5371
O4 = 15.9994 × 4 = 63.9976
167.5371 + 63.9976 = 231.5347 (231.535 rounded)
Therefore, the molecular mass of ferric oxide is 231.535.
4. The percentage composition of chlorine in CaCl2 is derived as follows:
The molecular mass of the entire compound is:
Ca = 40.078 × 1 = 40.078
Cl2 = 35.4527 × 2 = 70.9054
40.078 + 70.9054 = 110.9834 (110.983 rounded)
The atomic mass of each element (or its multiple) is divided by the molecular mass of the compound:
Ca = 40.078 ÷ 110.983 = 0.361
Cl2 = 70.9054 ÷ 110.983 = 0.639
Multiplying each by 100 will turn these into percents. Therefore, the percentage composition of chlorine is 63.9%.
5. i. a, c, f, h
ii. e
iii. b, d, g, i
iv. i
1. In which situation will erosion likely to occur? Why?
gras
The situation where erosion is likely to occur is B. A bare hillside with loose, dry soil
Why would erosion likely occur ?Erosion is an ongoing process of soil displacement when airflows or water currents move through landforms. Examples occur on hillside areas which have no plants, grasses, shrubs, or anything else to stabilize the dry dirt underneath – making it easy for wind and rainfall to literally transport the surface materials in downward cascades.
Unfortunately, this can yield serious consequences - from impoverished fertility to extra sediments being added to nearby creeks and rivers, to demolishing the infrastructure located at the base of the hill.
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Options include;
3. John Dalton in 1801, established the relationship between the partial pressure of con gases and total pressure of the gas mixture, which is called Dalton's law of partial pressure
Define partial pressure of gas.
Show that partial pressure of a component gas is the product of total press mole fraction.
c) Air contains 20% of O₂ and 80% of N₂ by mass. Find the partial pressure N₂ at the sea level at 25°C. (2) OR
Dalton's law, which states that a gas mixture's overall pressure is equal to the sum of its component gases' partial pressures.
Thus, The pressure that each gas would produce if it occupied the same volume of the mixture by itself at the same temperature is known as the partial pressure.
The English chemist John Dalton stated this empirical relationship in 1801.
It derives from the kinetic theory of gases on the basis of an ideal (perfect) gas and presupposes no chemical interaction between the constituent gases. It roughly holds true for real gases when pressures are low enough and temperatures are high partial pressure.
Thus, Dalton's law, which states that a gas mixture's overall pressure is equal to the sum of its component gases' partial pressures.
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Calculate the values of pH and pOH, based on Kw and the concentration of all species present in a neutral solution of water.
The values of pH and pOH will be 7 in a neutral solution of water.
pH is defined as the negative logarithm of H⁺ ion concentration.
pH is a measure of how acidic or basic a substance is. In our everyday routine, we encounter and drink many liquids with different pH. Water is a neutral substance. Soda and coffee are often acidic.
The pH is an important property, since it affects how substances interact with one another and with our bodies. In our lakes and oceans, pH determines what creatures are able to survive in the water.
Kw = ionic product of water
Kw = 10⁻¹⁴
Kw = [H⁺] [OH⁻]
From the value of Kw,
[H⁺] = [OH⁻] = 10⁻⁷
pH =pOH = -log 10⁻⁷
pH = pOH = 7 for a neutral solution of water.
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2.380 gm of a metal on treatment with nitric acid and subsequent ignition gave 3.022 gm of the metallic oxide. Specific heat of metal is 0.055. Calculate the exact atomic weight.
3. A graph of the cooling curve of a pure substance is plotted. When is the graph level with the time axis?(2)
A. Never
B.At the melting point only
C.At the boiling point only
D.At both the melting point and the boiling point
A substance's cooling curve is a graph representing the change in temperature over time as it is allowed to cool. The gradient of the cooling curve is influenced by the heat capacity, thermal conductivity, and ambient temperature of the material. The correct option is A.
The rate of cooling for a sample with a known composition is measured in order to map the phase boundaries on a phase diagram. As the sample (or some piece of it) starts to go through a phase change, the rate of cooling will alter. When the temperature-time curve changes slope, these "breaks" will be visible.
In the cooling curve, the graph never meet with the time axis.
Thus the correct option is A.
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what kind assorted fruits that can be sold in school
The kind of assorted fruits that can be sold in school are Apples
Bananas, Oranges, Grapes, Pineapples, Mangoes, Strawberries, Blueberries, Kiwis, etc.
What kind assorted fruits that can be sold in school?There are many different types of fruits that can be sold in schools, depending on availability, seasonality, and local preferences.
The following are some examples of assorted fruits that are commonly sold in schools;
ApplesBananasOrangesGrapesPineapplesMangoesStrawberriesBlueberriesKiwisPapayasWatermelonsCantaloupesHoneydewsPearsPeachesLearn more about fruits here: https://brainly.com/question/27936661
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A+ 2B
An elementary liquid phase reaction needs to be carried out in a CSTR reactor with a
volume 5 m3 and conversion desired is 70%.the molar feed is 30 % A and 70% B at a
pressure 202 kpa and 333к
1. Construct a complete stoichiometric table in terms of concentrations
2. What is the rate of reaction of A
3. Calculate k & E and then specify the type of reaction energy
Additional information:
Total feed: 10 mole/s.
Gas constant: 8.314 kJ/mol.oK
Frequeney factor: 0.00717 m'/mols
The stoichiometric table and the rate law for the given elementary liquid phase reaction have been constructed. The rate constant and activation energy have been calculated, and the type of reaction energy has been specified as endothermic.
Stoichiometric table in terms of concentrations:
The stoichiometric table for the given reaction can be constructed as follows:
A + 2B → products
A B products
Feed 0.3*Cf 0.7*Cf 0
Exit (0.3-0.3X)*C (0.7-0.7X)*C 0
Change -0.3XC -0.7XC 0
Where:
Cf = Total feed concentration
C = Concentration inside reactor
X = Conversion of A
Rate of reaction of A:
The rate of the reaction can be expressed as:
rA = -1/2 * dCA/dt = k*C^2
where, CA is the concentration of A and k is the rate constant.
Since the reaction is elementary, the rate law is proportional to the concentrations of the reactants raised to their stoichiometric coefficients.
The rate of disappearance of A = rate of appearance of B
rB = -dCB/dt = 2*rA
Therefore, the rate of reaction of A can be expressed as:
rA = (0.7Cf - 0.7C)/V = k*C^2
Substituting values, we get:
rA = (0.710 - 0.70.7X)/5 = k(0.3 - 0.3*X)^2
Calculation of k and E:
The rate constant k can be calculated using the Arrhenius equation:
k = A * exp(-Ea/RT)
where A is the frequency factor, Ea is the activation energy, R is the gas constant and T is the temperature in Kelvin.
Assuming the activation energy is 50 kJ/mol, we can calculate the rate constant at the given temperature of 333 K:
k = 0.00717 * exp(-50000/(8.314*333)) = 0.0001504
The reaction energy can be determined by calculating the activation energy using the rate constant at two different temperatures. Assuming the rate constant at 323 K is 0.000098, we can solve for Ea:
ln(k2/k1) = Ea/R * (1/T1 - 1/T2)
ln(0.000098/0.0001504) = Ea/8.314 * (1/323 - 1/333)
Ea = 43775 J/mol
The positive value of the activation energy indicates that the reaction is endothermic.
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What is the mass of carbon in grams found in one molecule compound C7H804
Answer:
The mass of carbon in grams found in one molecule of the compound C7H804 is approximately 2.80 grams.
500.0 liters of a gas in a flexible-walled container are prepared at 0.92 atm and 473K. The gas is placed into a tank under high pressure. When the tank cools to 293K, the pressure of the gas is 3.0 atm. What is the volume of the gas?
P1V 1 T2=P 2 V 2 T 1
Question 17 options:
48 L
248 L
19 L
95 L
The volume of the gas in the tank at 293K and 3.0 atm pressure is 248 L. Hence, option B is correct.
Given:
T1 = 473K
T2 = 293K
P1 = 0.92 atm
P2 = 3.0 atm
The ideal gas law equation is:
PV = nRT
where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is temperature.
n1 = (PV)/(RT)
= (0.92 atm × 500.0 L)/(0.0821 Latm/molK × 473K)
= 10.42 mol
Use the ideal gas law again to find the final volume of the gas in the tank under high pressure:
V2 = (n1 × R × T2)/P2
= (10.42 mol × 0.0821 Latm/molK × 293K)/(3.0 atm)
= 248 L
Therefore, the volume of the gas in the tank at 293K and 3.0 atm pressure is 248 L.
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Answer:
Using the ideal gas law, PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin, we can solve for n:
n = PV/RT
We know that the initial volume is 500.0 L, pressure is 0.92 atm, and temperature is 473K. We can use this information to find the initial number of moles:
n1 = (0.92 atm x 500.0 L)/(0.08206 L atm/mol K x 473K) = 11.80 mol
Next, we can use the ideal gas law again to find the final volume. We know that the final pressure is 3.0 atm and the final temperature is 293K:
V2 = nRT2/P2
V2 = (11.80 mol x 0.08206 L atm/mol K x 293K)/3.0 atm = 95 L
Therefore, the volume of the gas at the lower temperature and higher pressure is approximately 95 L. Answer: 95 L.
What is the approximate base of the cumulus clouds if the surface air temperature at 1000 feet MSL is 70°F and the dewpoint is 48°F
Answer:
Explanation:
Here's the answer.
To estimate the approximate base of the cumulus clouds, we first need to determine the lifting condensation level (LCL), which is the height at which the air reaches saturation and clouds begin to form as it rises.
To calculate the LCL, we can use the following formula:
LCL = (T - Td) x 400
Where:
T is the temperature in Fahrenheit at the surface
Td is the dew point temperature in Fahrenheit at the surface
In this case, T = 70°F and Td = 48°F:
LCL = (70 - 48) x 400
LCL = 8800 feet MSL
So, the base of the cumulus clouds would likely be around 8800 feet MSL. However, this is just an estimate and the actual height of the cloud base can vary due to other factors such as atmospheric stability, moisture content, and local topography.
Which two of the following solutions would be the most effective buffers?
a) 0.5 M NH3 + 1.0 M NH4Cl
b) 1.0 M NH3 + 1.0 M HCl
c) 1.0 M NH3 + 1.0 M HF
d) 0.5 M NH4Cl + 1.0 M NaOH
e) 1.0 M NH4Cl + 0.5 M NaOH
The most effective buffer solutions will have a pKa value close to the desired pH, and will have relatively high concentrations of both the weak acid and its conjugate base. Therefore, options a) and e) are both good buffer solutions.
Option a) contains a weak base (NH3) and its conjugate acid (NH4Cl), and has a pKa of 9.25. Option e) contains a weak acid (NH4Cl) and its conjugate base (NaOH), and has a pKa of 9.25 as well. Hence the correct answer will be a) and e)
Option b) contains a weak base (NH3) and a strong acid (HCl), so it will not be an effective buffer solution. Option c) contains a weak base (NH3) and a weak acid (HF), but the concentration of HF is relatively low, so it will not be an effective buffer solution. Option d) contains a weak acid (NH4Cl) and a strong base (NaOH), so it will not be an effective buffer solution.
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4. The Haber process involves a synthesis reaction. The two reactants are H₂ (g) and N₂ (g), and the products are ammonia NH3 (g) and heat. The reaction takes place in a reaction vessel in which one of the factors that influence the reaction is a high temperature of about 600°C. The reactant atoms move freely about in the reaction vessel. Explain this reaction in terms of collision theory.
The reactant molecules must hit with each other in the proper orientation and with adequate energy, according to collision theory, for a reaction to take place.
The Haber process is a chemical reaction that produces heat and ammonia (NH₃) from hydrogen gas (H₂) and nitrogen gas (N₂). At a high temperature of roughly 600 °C and a pressure of roughly 200 atm, iron catalyses the process.
By taking into account the interactions between molecules, collision theory explains how chemical processes take place.
Molecules that are reactants may either bounce off one another when they collide without reacting, or they may react and produce products.
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What type of reaction will occur if ΔH is positive and entropy decreases?
Responses
spontaneous reaction
endothermic reaction
Gibbs free reaction
exothermic reaction
The reaction would be an endothermic reaction. Option B
What type of reaction occurs?With a positive H, endothermic processes take in energy from their environment. It is less advantageous for the process if the entropy drops because it indicates that the reactants are getting more organized.
The likelihood of the response happening spontaneously is decreased as a result. The reaction can, however, continue if additional energy is introduced to the system from an outside source as shown.
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PLEASE PLEASE PLEASE HELP ME!!!!!!!!
Starting with water, toggle between Real and Model at the top of the screen. The real view shows the experimentally determined bond angle. The model view shows the angle predicted by the VSEPR model. Carefully observe the bond angle in each case.
Complete the table by entering the real bond angle for each molecule listed.
Type the correct answer in each box.
The real bond angles are;
1) 104 degrees
2) 180 degrees
3) 119 degrees
4) 120 degrees
5) 107 degrees
6) 109.5 degrees
What is the VSEPR theory?The VSEPR (Valence Shell Electron Pair Repulsion) theory is a model used in chemistry to predict the shape of individual molecules based on the repulsion between valence electrons pairs in the outermost electron shell of an atom.
We know that we can look at the presence or the absence of the lone pairs or symmetry in the compound as as to ascertain the real bond angles of the compounds listed in the question.
The bond angles can be obtained from chemical litearture.
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Answer:
1) 104.5
2) 180
3) 119
4) 120
5) 107.8
6) 109.5
Explanation:
Please help answer these!
Consider the solubilities of a particular solute at two different temperatures.
Solubility (g/100 g H₂O)
44.3
81.4
Temperature (C)
20.0
30.0
Suppose a saturated solution of this solute was made using 51.0 g H₂O at 20.0 °C. How much more solute can be added if the
temperature is increased to 30.0 °C?
9.64 g more solute can be added if the temperature is increased to 30°C
The maximum amount of solute that can dissolve in a known quantity of solvent at a certain temperature is its solubility.
A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved. An unsaturated solution is a solution that contains less than the maximum amount of solute that is capable of being dissolved.
Mass of solute present in a saturated solution with 51.0 g H₂O at 20.0 °C is
(44.3 × 51) ÷ 100 = 22.6g
The ratio of solubilities at two different temperautures = 81.4 / 44.3 = 1.83
This means that there can be 1.83 times more solute when the temperature is 30 °C.
22.6 × 1.83 = 41.35 g
So, the mass of solute that can be added = 51 - 41.35 = 9.64g
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10. Using Valence Bonding theory, draw a hybrid orbital picture showing the hybrid and atomic orbitals that make up the bonding scheme for each molecule. Hint: Start by drawing a Lewis dot structure. For each molecule, complete the following questions: a) Draw and label a molecular orbital diagram; include all electrons in both the atomic and molecular orbitals. b) From your diagram, write out the ground-state molecular orbital configuration; namely o 1s² * 1s² ... c) Determine the bond order for the molecule. d) Would the following molecules be attracted to a magnet? Briefly explain i. B2^2 ii. Cz iii. HCl
The Valence Bond Theory (VBT) examines how atoms interact to explain chemical bonding.
.Valence bond theory states that the overlapping of partially filled atomic orbitals is what results in bonds.
.Ground-state molecular orbital configuration=σ 1 s, σ * 1 s, σ 2 s, σ * 2 s, σ 2 p z, π 2 p x = π 2 p y, π * 2 p x = π * 2 p y, σ * 2 p z
.bond order =1/2(bonding electron- non bonding electron)
A chemical bonding theory which explains the chemical connection between two atoms is the valence bond (VB) theory. It uses the concepts of quantum mechanics to describe bonding, similar to molecular orbital (MO) theory.
.Valence bond theory states that the overlapping of partially filled atomic orbitals is what results in bonds.
.Ground-state molecular orbital configuration=σ 1 s, σ * 1 s, σ 2 s, σ * 2 s, σ 2 p z, π 2 p x = π 2 p y, π * 2 p x = π * 2 p y, σ * 2 p z
.bond order =1/2(bonding electron- non bonding electron)
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Which of the following will not be the product(s) of a decomposition reaction
Two compounds an element and a compound two elements a single compound
A decomposition reaction is a chemical reaction that involves the breakdown of a single compound into simpler substances. In this type of reaction, the reactant molecule is split into two or more products, and the products formed are usually different from the original reactant.
The reactant may break down into two compounds, an element and a compound, two elements, or a single compound.
Out of the four options mentioned, a single compound will not be the product of a decomposition reaction. This is because a decomposition reaction breaks down a single compound into simpler substances, which means that it cannot produce a single compound as a product.
For example, consider the decomposition of water (H2O) into hydrogen gas (H2) and oxygen gas (O2). The reaction can be represented as:
2H2O → 2H2 + O2
In this reaction, a single compound (H2O) is broken down into two simpler substances (H2 and O2). This is an example of a decomposition reaction that produces two elements as products.
In conclusion, a decomposition reaction can produce two compounds, an element and a compound, or two elements as products, but it cannot produce a single compound as a product.
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Consider an ideal gas, initially in one half of the apparatus, expands into a vacuum to fill the other half. Initially the gas is in thermal equilibrium with the surroundings.
Which of the following is FALSE about this gas expansion process?
∆T=0
∆E=0
∆S(surroundings)=0
w = q
∆KE=0
∆S(system)=0
∆H=0
∆PE=0
The false statement about the gas expansion process is "∆S(system)=0".
When the gas expands into the vacuum, it undergoes an irreversible process. The gas molecules move from a region of high concentration to a region of low concentration, and as a result, there is an increase in entropy (∆S) of the gas.
According to the Second Law of Thermodynamics, the entropy of an isolated system will always increase for an irreversible process. Therefore, the entropy of the system, in this case, the gas, increases as it expands into the vacuum. The false statement about the gas expansion process is "∆S(system)=0". The other statements are true for this process. Since there is no temperature difference between the gas and the surroundings, the change in temperature is zero (∆T=0). The change in internal energy (∆E) is also zero since the gas is expanding against no external pressure. Finally, since there is no heat transfer between the system and the surroundings, the work done (∆PE + ∆KE) is equal to the heat transfer (w = q).
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Hello. Need help answering this question.
A sample of Zn(s) is reacted with HCl(aq) to form hydrogen gas. The H2 gas bubbles out of aqueous solution and is collected in a 670.0 mL container at 576.0 Torr and 25 C. How many grams of zinc reacted?
0.04 grams of zinc reacted
The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as
PV = nRT
where,
P = Pressure
V = Volume
T = Temperature
n = number of moles
Given,
Volume = 670 ml = 0.67L
Pressure = 576 torr
Temperature = 25 degree celsius
PV = nRT
576 × 0.67 = n × 62.36 × 298
n = 0.02 moles
mass = moles × molar mass
= 0.02 × 2 = 0.04g
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a blank can be seen when a substance change into a new substance
As per chemical changes, a color change can be seen when a substance change into a new substance.
Chemical changes are defined as changes which occur when a substance combines with another substance to form a complete new substance.Alternatively, when a substance breaks down or decomposes to give new substance it is also considered to be a chemical change.
There are several characteristics of chemical changes like those of change in color, change in state , change in odor and even change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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What happens in a reaction if it is at chemical equilibrium?
Responses
The reaction rates of making products and using reactants are equal.
All of the reactants are used up.
The amount of the product is constantly decreasing.
There are no products in the system.
The reaction can be said to be at equilibrium when the reaction rates of making products and using reactants are equal.
When is a reaction at equilibrium?When the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products don't change over time, a chemical reaction is said to be in equilibrium.
When the system reaches equilibrium, it is in a state of balance, which means that the concentrations of the reactants and products have not changed significantly.
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at a blood bank there are five problems with a labortory technician's work performance the first year of work
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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This is an impossible formula. If it were real, determine the molar mass of:
KBr•8H2O
Answer:
The answer is 223.8g/mol
Explanation:
RMM=1×39.1+1×1×79.9•8(2×1+1×16)
=39.9+79.9•8(2+16)
=119.8•8(18)
=119.8+114
RMM=223.8g/mol
A patient is given 0.050 mg of technetium-99 m
(where m means metastable—an unstable but long-lived state), a radioactive isotope with a half-life of about 6.0 hours. How long until the radioactive isotope decays to 3.1×10−3 mg?
It will take 22 hours until the radioactive isotope decays to 0.0031mg.
The half-life of a chemical reaction can be defined as the time taken for the concentration of a given reactant to reach 50% of its initial concentration.
The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.
Given,
Initial mass = 0.05 mg
Final mass = 0.0031 mg
Half Life = 6 hours
N / N₀ = [tex]( 1 / 2)^n[/tex]
0.0031 / 0.05 = [tex]( 1/2)^n[/tex]
n = 3.65
t = n × half life
= 3.65 × 6
= 21.9 hours = 22 hours
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Which statement is the best description of the energy found in molecules of water?
A molecule's temperature is not connected to its energy.Hotter molecules have more kinetic energy.
Colder molecules have more kinetic energy.
Colder molecules have more thermal energy.
Answer:
In hot water, molecules gain kinetic energy, therefore molecules in hot water have kinetic energy
while molecules of cold water have less or no kinetic energy
Which piece of information do you need to determine whether a molecule is an alkyne or an alkene?
A. The type of C-H bonds in the molecule
B. The number of C-H bonds in the molecule
C. The number of C-C bonds in the molecule
D. The type of C-C bonds in the molecule
Answer is D
The piece of information that you need to determine whether a molecule is an alkyne or an alkene is D. The type of C-C bonds in the molecule
How to determine whether a molecule is an alkyne or alkene?Alkenes and alkynes can be decribed as the name that is been gotten by by identifying the longest chain that contains the double or triple bond.
It should be noted that The chain is numbered so that theminimization of the numbers assigned to the double or triple bond can be easy however the suffix of the compound can be “-ene” when regarding to an alkene or “-yne” when regarding to alkyne.
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When a chemical hand warmer is activated, it becomes warm to the touch. In terms of energy, what is occurring?
Answer:
Exothermic processes.
Explanation:
Answer:
Exothermic processes.
Explanation:
Exothermic processes will feel warm to the touch and show an increase in temperature. For example, when an 'instant hand warmer' is exposed to air a chemical reaction takes place that releases heat. This exothermic chemical reaction can be used to warm a person's hands when they are cold.
How and why is C is the right answer?
The correct answer to the question is option C as that is the only option in which the change in entropy is positive.
Entropy is the degree of randomness in the system. The gaseous state has the highest entropy among the state of matter.
a) Ag⁺ (aq) + Cl⁻ (aq) → AgCl (s)
Since the aqueous state has higher entropy than solids, the change in entropy is negative
b) H₂O (l) ----> H₂O (s)
Since the liquid state has higher entropy than solids, the change in entropy is negative.
c) 2SO₃ (g) ----> 2SO₂ (g) + O₂ (g)
Since the reactant has only 2 moles of gas and the product has 3 moles of gas, the entropy of the reactant increases with the reaction.
d) CaO (s) + CO₂ (g) -----> CaCO₃ (s)
Since the reactant has one mole of gas and the product has none thus the change in entropy is negative.
e) N₂ (g) + 3H₂ (g) ------> 2NH₃ (g)
Since the reactant has more moles of gases than the product which are 4 and 2 moles of gas respectively, the change in entropy is negative.
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