Gloves is the tool component which will unlikely present a hazard in this scenario.
What is Hazard?
This is referred to as potential source of harm when performing various types of activities.
Gloves will unlikely cause harm as it is used to prevent the risk of electric shock when handling electrical devices which is why it is the most appropriate choice.
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Use the chemical equation to answer the question.
2H₂(g) + O₂(g) → 2H₂O(1)
Which statement describes the breaking and forming of bonds in the reaction?
The reaction requires breaking one H-H bond and two O=O bonds, and then forming four O-H bonds.
The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O-H bonds.
The reaction requires breaking four O-H bonds, and then forming one H-H bond and two O=O bonds.
The reaction requires breaking four O-H bonds, and then forming one O=O bond and two H-H bonds
Answer: The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O-H bonds.
Help pls need it!:))
Answer:
[tex]\textsf {A}[/tex]
Explanation:
[tex]\textsf {The effect of a catalyst on the energy of a reaction system }\\\textbf {is that it reduces the activation energy.}[/tex]
Answer:
it reduces the activation energy (option A)
Explanation:
we know that a catalyst reduces the activation energy because it speeds up a reaction (that is what a catalyst is--a substance that speeds up a reaction [whilst leaving it unchanged chemically]. )
So, if a catalyst is speeding up the time it takes for a reaction to occur, it is logically lowering the minimum energy that is needed for the reaction to occur.
This can best be expressed in option A, because it lowers the activation energy
How many grams of solid barium sulfate form when 32.0 mL of 0.160 M barium chloride reacts with 70.0 mL of 0.065 M sodium sulfate? Aqueous sodium chloride forms also.
Considering the reaction's stoichiometry and the notion of molarity, 1.167 grams of solid barium sulfate form when 32.0 mL of 0.160 M barium chloride reacts with 70.0 mL of 0.065 M sodium sulfate.
The balanced reaction is:
BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2 NaCl(aq)
What is a Limiting Reagent?The reactant that is consumed first in a chemical reaction is the limiting reagent because it stops any more reactions from taking place. The limiting reagent controls how much product is produced during the reaction.
Utilizing the reaction stoichiometry and the estimated number of moles, it is possible to identify the limiting reagent.
According to reaction stoichiometry, which describes the proportions of reagents and products in a chemical reaction, the following numbers of moles of each component are involved in the reaction:
BaCl₂: 1 moleNa₂SO₄: 1 moleBaSO₄: 1 moleNaCl: 2 molesMolarity, on the other hand, refers to how many moles of solute are dissolved in a certain volume.
Molarity is determined by the expression:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units[tex]\frac{moles}{L}[/tex].
In this case, 32.0 mL= 0.032L (being 1000 mL= 1 L) of barium chloride reacts. So, by definition of molarity, the number of moles that participate in the reaction is calculated as:
[tex]0.160 M=\frac{No. of moles of solute}{0.032L}[/tex]
No of moles of barium chloride(solute) = 0.160M × 0.032L
No of moles of barium chloride(solute) = 0.00512moles
On the other side,70.0mL= 0.070 L of 0.065 M sodium sulfate reacts. So, by definition of molarity, the number of moles that participate in the reaction is calculated as:
[tex]0.065 M =\frac{No of moles of solute}{0.070L}[/tex]
No of moles of Sodium sulfate= 0.065M × 0.070L
No of moles of Sodium sulfate = 0.0045moles
if by stoichiometry 1 mole of barium chloride reacts with 1 mole of sodium sulfate, 0.00512moles of barium sulfate reacts with how many moles of sodium sulfate?
No. of moles of sodium sulfate=
[tex]\frac{ 0.00512moles of barium sulfate * 1 mole of sodium sulfate}{1 mole of barium chloride}[/tex]
amount of moles of sodium sulfate= 0.00512 moles
But 0.00512moles of sodium sulfate are not available, 0.0045moles moles are available. Since you have fewer moles than you need to react with 0.00512moles of barium chloride, sodium sulfate will be the limiting reagent.
Then, it is possible to determine the number of moles of barium sulfate produced by another rule of three: if by stoichiometry 1 mole of sodium sulfate produces 1 mole of barium sulfate, 0.00512 moles of sodium sulfate produces how many moles of barium sulfate?
[tex]Amt of mole of barium sulfate=\frac{0.00512 moles of sodium sulfate* 1mole of barium sulfate}{1 mole of sodium sulfate}[/tex]
amount of moles of barium sulfate= 0
Being the mass molar of barium sulfate is 233.34 g/mole, the mass-produced of the compound is calculated as:
= [tex]\frac{0.00512 moles * 233.34 gm}{1 mole}[/tex]
=1.167 gm
Hence, 1.167 gm of solid barium sulfate is formed.
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Combustion reactions are ones that always include elemental oxygen as a reactant. When a hydrocarbon (substance made up of carbon and hydrogen) reacts with oxygen, the products of the combustion reaction are carbon dioxide and water.
Drag and drop the products to the correct reactants for these combustion reactions. The reactants have the correct coefficients for making balanced reactions.
1. CH4 + 2O2 = CO2 + 2H20 B.
2. 2CH2H6 + 7O2 = 4CO2 + 6H20 A
3. C3H8 + 502 = 3CO2 + 4H20 C
To find the appropriate end products, use the following rules
The hydrogen ratio should be the same on both the product and reactant sidesThe oxygen ratio should be the same on both the product and reactant sidesThe carbon ratio should be the same on both sides.Thus for equation;
1. CH4 + 2O2 = CO2 + 2H20 B.
2. 2CH2H6 + 2O2 = 4CO2 + 6H20 A
3. C2H8 + 502 = 2CO2 + 4H20 C
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Under which conditions will gases best dissolve in liquids?
A. when the pressure is low and the temperature is low
B. when the pressure is high and the temperature is high
C. when the pressure is low and the temperature is high
D. when the pressure is high and the temperature is low
c option is correct answer
Question 9 of 10
What is an open system?
OA. A system that allows energy to move in and out but not mass
B. A system that allows energy and mass to move in and out of it
XA
Answer:
The answer is B an open system allows energy and mass to move in and out of it
Hope it helps
How many mol of C7H16 would you have if you have 76.36 grams? Give your answer to 2 decimal spaces.
0.761 mol of [tex]C_7H_{16}[/tex] would you have if you have 76.36 grams.
What is a mole?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Given data:
Mass=76.36 grams
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{76.36 grams}{100.21 g/mol}[/tex]
Moles = 0.761
Hence, 0.761 mol of [tex]C_7H_{16}[/tex] would you have if you have 76.36 grams.
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Read the given equation.
2Na+ 2H₂O 2NaOH + H₂
During a laboratory experiment, a certain quantity of sodium metal reacted with water to produce sodium hydroxide and hydrogen gas. What was the initial quantity of
sodium metal used if 7.80 liters of H₂ gas were produced at STP?
07:29 grams
09.30 grams
12.2 grams
16.0 grams
Write and balance the equation for the combustion of the fatty acid lauric acid, (C12H24O2)
.
Express your answer as a chemical equation. Identify all of the phases in your answer.
The combustion of lauric acid is shown as CH3(CH2)10COOH(s) + 18O2(g) -----> 12H20(l) + 12CO2(g)
What is combustion?In a combustion reaction, a substance is burnt in oxygen. If the substance is an organic compound a the case is here, the products are carbon dioxide and hydrogen.
No the equation of the combustion of lauric acid is shown as;
CH3(CH2)10COOH(s) + 18O2(g) -----> 12H20(l) + 12CO2(g)
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How many moles of N are in
0.227g N₂0?
Answer:
0.217 ×2. =9.86×10moles
44
What does Gay Lussacs law state and explain
Answer:
'Gay-Lussac's law is a gas law that states the pressure of a gas varies directly with temperature when mass and volume are kept constant. As the temperature increases, the pressure will also increase.'
Answer:
Gay Lussac’s law says that the pressure created by a gas is proportional to the temperature of the gas when the mass is constant or the same
so, when pressure increases so does the temperature and when pressure decreases so does the temperature
Describe the subatomic structure of the nucleus, including the structure of each nucleon. Draw a picture. Describe the forces that hold the nucleus together and draw them on your diagram. Explain how beta emission works.
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i hope someone can help me here please don't answer nonsense!
Answer:
4560 torr
Explanation:
PV = K
4 x 1.5 = k
k = 6
V = k / p
V = 6 / 1
V = 6
atm to torr = 1 to 760
760 x 6 = 4560
A piece of metal with a mass of 23.2 g at 120.1oC is placed in a styrofoam cup containing 35.0 g of water at 22.2oC. Once the system has reached equilibrium, the final temperature of the water is 34.0oC. What is the specific heat of the metal to four significant digits? The specific heat of water is 4.18 J/g-oC.
Answer:
0.8797 J/g oC
Explanation:
use mcAT=mcaT
Calculate the mass in grams of each of the following using dimensional analysis:
a. 6.02 x 1023 atoms of Mg
3.01 x 1023 formula units of CaCl2
12.4 x 1015 molecules of formaldehyde (CH2O)
The mass in grams of each of the following using dimensional analysis is:
6.02 x 10²³ atoms of Mg = 12g of Mg3.01 x 10²³ formula units of CaCl2 = 55.5g of CaCl212.4 x 10¹⁵ molecules of formaldehyde (CH2O) = 0.000000618g of formaldehydeHow to calculate mass?The mass of a substance can be calculated in different ways depending on whether molecules or moles are given.
First, we need to convert atoms/formula units/molecules to moles as follows:
6.02 × 10²³ ÷ 6.02 × 10²³ = 1 mole of Mg3.01 x 10²³ ÷ 6.02 × 10²³ = 0.5 moles of CaCl212.4 x 10¹⁵ ÷ 6.02 × 10²³ = 2.06 × 10-⁸ moles of formaldehydeNext, we convert each mole value to mass as follows:
1 mole of Mg = 1 × 12 = 12g of Mg0.5 moles of CaCl2 = 0.5 × 111 = 55.5g of CaCl22.06 × 10-⁸ moles of CH2O = 0.000000618g of formaldehydeLearn more about mass at: https://brainly.com/question/19694949
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Here: Describe the non metal elements .What group number are non metals
Answer:
A nonmetal is a chemical element that generally lacks a predominance of metallic properties. Non-metals are mostly found in groups 5, 6 and 7. These non-metals will have 5, 6 or 7 electrons in the outer shell.
The outer shell of a non-metal is, therefore, more than half full of electrons.
5. A group decided to use 250.0 mL of vinegar and 24.0 grams of baking soda. What is the limiting
reactant?
Hence, If the concentration of Acetic acid in vinegar is more than 7%, the limiting reactant is baking soda. If the concentration of Acetic acid in vinegar is less than 7%, the limiting reactant is vinegar.
What is a limiting reactant?The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.
To solve this problem, it is necessary to know the exact concentration of acetic acid in vinegar, because manufacturers produce many types of vinegar the with different concentrations. Most often, concentration of acetic acid in vinegar ranges from 4% to 8%. In this case, it is possible
to calculate the concentration of vinegar making the assumption that 250 ml of vinegar reacts completely with 24 grams of baking soda.
Acetic acid [tex]CH_3CO_2H[/tex] reacts with baking soda [tex]NaHCO_3[/tex] according to the equation:
[tex]CH_3CO_2H + NaHCO_3[/tex] → [tex]CH_3CO_2Na + CO_2 + H_2O[/tex]
1. Molar mass of [tex]NaHCO_3[/tex] is 23+1+12+16×3 = 84 g/mol
= [tex]\frac{1 mol \;NaHCO_3}{84 g \;NaHCO_3}[/tex]
= [tex]\frac{24 g \;NaHCO_3 X 1 mol \;NaHCO_3}{84 g \;NaHCO_3}[/tex]
=0.29 mol [tex]NaHCO_3[/tex]
2. From the balanced equation we see that 1 mole of [tex]NaHCO_3[/tex] reacts with 1 mole of [tex]CH_3CO_2H[/tex] , then 0.29 moles of [tex]NaHCO_3[/tex] react with 0.29 moles of [tex]CH_3CO_2H[/tex].
3. Mass of 1 mole of [tex]CH_3CO_2H[/tex] is 12+ 1×3+12+16×2=60 g/mol
= [tex]\frac{0.29 mol \;CH_3CO_2H X \;60 g \;CH_3CO_2H }{1 mol \;CH_3CO_2H}[/tex]
[tex]=17.4 g CH_3CO_2H[/tex]
4. In this step density of vinegar is needed.
Making the assumption that concentration of acetic acid is 7%, we can calculate the mass of acetic acid in 250 ml of vinegar:
Mass of vinegar=Volume × density
= 250 ml ×1.0084 g/ml
=252 g
Mass of acetic acid = mass of vinegar × concentration ÷ 100%
= 252 g × 7% ÷ 100%
= 17.6 g.
17.6 g [tex]CH_3CO_2H[/tex] is very close to 17.4 g [tex]CH_3CO_2H[/tex]. It means, that 250 ml of vinegar with a concentration of acetic acid equal to 7% reacts completely with 24 g of baking soda.
Hence, If the concentration of Acetic acid in vinegar is more than 7%, the limiting reactant is baking soda. If the concentration of Acetic acid in vinegar is less than 7%, the limiting reactant is vinegar.
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2022
DP Chemistry Practical Guide
Dission Questions
Why are the burette and the pipette rinsed with the solution with which these are filled?
Answer:
OOO
Explanation:
OOOOOO
Balanced chemical equation: BaCl2(aq)+Na2SO4(aq)⟶BaSO4(s)+2NaCl(aq)
Using 1.46 moles of NaCl, determine how many grams of NaCl can be produced.
Then, using the moles of NaCl found in a previous question, determine how many formula units of NaCl can be produced. formula units:
Answer:
Part 1) 85.3 grams NaCl
Part 2) 8.79 x 10²³ formula units NaCl
Explanation:
(Part 1)
To find the mass of NaCl, you need to multiply the given value (1.46 moles) by the molar mass of NaCl. This measurement is the atomic masses of the elements times each of their quantities combined. In this case, there is only one mole of each element in the molecule. Moles should be located in the denominator of the conversion to allow for the cancellation of units. The final answer should have 3 sig figs to reflect the given value.
Molar Mass (NaCl): 22.99 g/mol + 35.45 g/mol
Molar Mass (NaCl): 58.44 g/mol
1.46 moles NaCl 58.44 g
--------------------------- x ---------------- = 85.3 grams NaCl
1 mole
(Part 2)
I do not know which other question the second part is referring to, so I will just use the moles given in the first part. To find the formula units, you need to multiply the given value (1.46 moles NaCl) by Avogadro's Number. This conversion represents the number of formula units found in 1 mole of the sample. The moles should be in the denominator of the conversion to allow for the cancellation of units.
Avogadro's Number:
1 mole = 6.022 x 10²³ formula units
1.46 moles NaCl 6.022 x 10²³ units
------------------------ x ----------------------------- = 8.79 x 10²³ formula units NaCl
1 mole
How would one convert 15 seconds to hours?
1
A. 15 seconds x
3600 seconds
B. 15 seconds x 60 seconds
3600 seconds
1 hour
1 hour
3600 seconds
O C. 15 seconds x
OD. 15 seconds
Answer:
15 seconds x (1 hour/3600 seconds)
Explanation:
By the factor label method. There are 60 seconds in a minute and 60 minutes in an hour.
15 seconds x (1 minute/60 seconds) x (1 hour/60 minutes) = your answer
Soon enough you'll realize that 60x60=3600 and so there are 3600 seconds in 1 hour. Then you will only need 1 conversion ratio;
15 seconds x (1 hour/3600 seconds) = your answer
Answer:
15 / 3600
Explanation:
15 / 3600
Under which conditions of temperature and pressure, the real gas behave ideally?
Answer:
A real gas will act as an ideal gas under high temperature and at a low pressure.
Real gases are non-ideal gases whose molecules occupy space and have interactions, consequently, they do not adhere to the ideal gas law.
An ideal gas has molecules that occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.
Explanation:
What best describes the reason why neap tides occur?
A. Neap tides occur in the fall and winter months when the Sun and Moon align obliquely to each other.
B. Neap tides occur when the angle between the Earth and Sun is 90° offsetting the attraction of the Moon.
C. Neap tides occur during the change of tide when there is no movement of water.
D. When the Sun and Moon are at right angles, the combined gravity is weaker producing modest tides.
Answer:
Explanation:
A
describe the trends in the atomic size, location energy and electrongavity from left to right across a period in periodic table
Atomic size decreases in a period but the ionization energy and electronegativity increases across a period.
Describe the trends in the atomic size, ionization energy and electronegativity?Atomic radius decreases across a period because of nuclear charge increases whereas atomic radius of atoms generally increases from top to bottom within a group because there is again an increase in the positive nuclear charge.
Ionization energy increases when we move from left to right across an period and decreases from top to bottom.
Electronegativity also increases from left to right across a period and decreases from top to bottom.
So we can conclude that atomic size decreases in a period but the ionization energy and electronegativity increases across a period.
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324.55 cm - (6104.5 cm²/22.3 cm)
Answer: 50.806 cm is the correct answer.
Explanation: First divide 6104.5 cm^2 by 22.3 cm.
[tex]\frac{6104.5cm^2}{22.3cm} = 273.74 cm[/tex]
*Note: When dividing units, subtract the exponents, and when multiplying units simply add the exponents.
Then continue by subtracting 324.55 cm - 273.74 cm.
This should give you an answer of 50.806 cm.
Preparation of ammonia gas
Answer:
Ammonia is easily made in the laboratory by heating an ammonium salt, such as ammonium chloride NH4Cl with a strong alkali, such as sodium hydroxide or calcium hydroxide.
The gas may also be made by warming concentrated ammonium hydroxide.
Explanation:
2NH4Cl + Ca(OH)2 → CaCl2 + 2H2O + 2NH3(g)
If heat is added to 25.0g of copper, calcium, aluminum, iron, lead what will have the highest final temperature
Lead will have the highest temperature .
What is Specific Heat ?
Specific Heat is defined as the amount of heat required to raise the temperature of a 1 gm of substance by 1 degree Celsius.
If heat is added to 25.0g of copper, calcium, aluminum, iron, lead
The missing given specific heat is
Copper, 0.377
Calcium, 0.656
Aluminum, 0.895
Iron, 0.448
Lead, 0.129
Higher specific heat means more temperature required to bring the same amount of change in temperature
Here the temperature change is fixed , The metal with the lowest Specific heat will have the highest temperature.
From the data it can be seen that
Specific Heat of Lead, 0.129
Therefore Lead will have the highest temperature.
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Boyle's law only works when a gas is kept at a constant temperature. Experimentally this is very tricky as changes in pressure or volume often affect the temperature of a gas. In a real closed piston, rapidly reducing the volume of a gas will actually increase its temperature. Where is the heat that creates this temperature change coming from?
The heat that creates this temperature change coming from change in the internal energy of the system as per as first law of thermodynamics.
What is Boyle's law ?A law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
As we know, Boyle's law only works when the gas is kept at a constant temperature
Here,
When volume of gases decreased, it means work done has occurred on the system, so the work done is used for raising internal energy of the gas and the other is released as the thermal energy.
So,
According to 1st law of thermodynamics,
we know Q = ΔU + W i.e, change in internal energy and work done. So this is a reason. Changing temperature occurs.
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Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). (3 points)
1.
Adding hydrogen gas
2.
Adding a catalyst
3.
Decreasing the pressure
a.
Shift to the left
b.
Shift to the right
c.
No effect
Answer:
1. Adding hydrogen gas, b. shift to the right
2. Adding a catalyst, c. No effect
3. Decreasing the pressure, a. shift to the left
Explanation:
Hydrogen gas can be rewritten as H2. Whenever you add something to an equilibrium expression, it will shift to whichever side does not have this. So, since the reactant side has 3 moles of H2, adding more H2 to the reaction will shift to the products side, since there is no H2 there.
Adding a catalyst has no effect on equilibrium reactions.
When decreasing the pressure, equilibrium will shift to the side with the greater number of moles of gas. In this case, there are 4 moles of gas on the left, and 2 on the right, so it would shift to the left.
A sample of zinc is heated to a temperature of 77.4ºC, then placed in a calorimeter containing 65.0 g of water. Temperature of water increases from 20.00ºC. The specific heat of zinc is 0.390 j/g°C. What was the mass of the zinc sample?
180.189 g was the mass of the zinc sample with a specific heat of zinc is 0.390 j/g°C.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
Using specific heat capacity formula here:
[tex]C_{Zn}[/tex] × [tex]m_{Zn}[/tex]× Δ[tex]T_{Zn}[/tex] = [tex]C_{H_2O}[/tex]× [tex]m_{H_2O}[/tex] × Δ[tex]T_{H_2O}[/tex]
0.390J/g°C × [tex]m_{Zn}[/tex] ×77.4ºC = 4.184J/g°C× 65.0g × 20.00ºC.
[tex]m_{Zn}[/tex] = 180.189 g
Hence, 180.189 g was the mass of the zinc sample.
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PLEASE HELP ASAP!!!!!!!!!!!!!!!
Answer:
A and B
Explanation:
A is crust
B is mantle
