An investigation is conducted into how the mass of magnesium metal reacting with hydrochloric acid affects the amount of hydrogen gas produced.
Masses of 0.10g, 0.20g, 0.30g and 0.40g of powdered Mg metal are reacted with hydrochloric acid(HCl). The conical flask containing the reaction mixture of Mg and HCl is connected to another conical flask with a hose. The hydrogen gas produced by the reaction is collected in this conical flask. The greater the amount of hydrogen gas produced by the reaction the greater the pressure of the gas in the flask.
Answer:
A) what is the independent variable:
B) what is the dependent variable:
C) write a hypothesis for this investigation:
D) give 2 variables that should have been controlled for this investigation:
Answers
An investigation is conducted into how the mass of magnesium metal reacting with hydrochloric acid affects the amount of hydrogen gas produced.
Masses of 0.10g, 0.20g, 0.30g and 0.40g of powdered Mg metal are reacted with hydrochloric acid(HCl). The conical flask containing the reaction mixture of Mg and HCl is connected to another conical flask with a hose. The hydrogen gas produced by the reaction is collected in this conical flask. The greater the amount of hydrogen gas produced by the reaction the greater the pressure of the gas in the flask.
Answer:
A) what is the independent variable:
B) what is the dependent variable:
C) write a hypothesis for this investigation:
D) give 2 variables that should have been controlled for this investigation:
Related Questions
What are proteins made up of?
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Answer:
cereal egg fish
that's a ll I know
Are plants and animal pH sensitive?
Answers
Answer:
Plants and animals are pH sensitive. The growth of plants is dependent on the nature of the soil. If the pH of the soil is greater than 7 and is alkaline, then the plants cannot grow in the soil.
Explanation:
Convert 7.65 x 10^5 mL into Mega-Liter.
Answers
Answer:
[tex]1 \: ml = \frac{1}{1000} l \\ 7.65 \times {10}^{5} \: ml = \frac{7.65 \times {10}^{5} }{1000} \\ = 765 \: l[/tex]
Where and why the U.S. acid rain damage is the greatest.
Answers
Answer:
Some acid rain occurs naturally, but sulfur dioxide and nitrogen oxide emissions from smokestacks combine with rain to make sulfuric and nitric acid in amounts that harm.
Explanation:
Balance this equation
Answers
HELP!
The piston of an internal combustion engine
compresses 218 mL of gas. The final pressure
is 15 times greater than the initial pressure.
What is the final volume of the gas, assuming
constant temperature?
Answer in units of mL.
Answers
Answer:
14.53
Explanation:
V1= 218ML
V2= ?
P2= 15P1
USING BOYLE'S LAW
P1V1= P2V2
V2= P1V1/P2
V2 = P1(218ML)/15P1 = 14.53ML
Choose the options below that are true of standard reduction potential. (select all that apply) Select all that apply: All standard reduction potentials are measured against that of the reduction of hydrogen ions to H2 gas. The standard reduction potential of a cell is determined by subtracting the standard reduction for the reaction at the anode from the standard reduction potential for the reaction at the cathode. Standard reduction potentials are dependent on reaction stoichiometry. The standard reduction potential for a cell is determined by adding the standard reduction potential for the reaction at the anode to the standard reduction potential for the reaction at the cathode.
Answers
Answer:
All standard reduction potentials are measured against that of the reduction of hydrogen ions to H2 gas.
Explanation:
The standard hydrogen electrode (SHE) serves as a sort of reference electrode. All standard electrode potentials of chemical systems are measured against the standard hydrogen electrode whose electrode potential has been arbitrarily set at 0.00 V.
The reduction potential of any other system is measured against the standard hydrogen electrode by connecting that half cell to the standard hydrogen electrode and observing the reading of the voltmeter. The standard hydrogen electrode consists of hydrogen ions of unit activity, hydrogen gas at 1 atm and the system is maintained at a temperature of 298 K.
Standard reduction potentials are measured against that of the reduction of hydrogen ions to [tex]H_2[/tex] gas because hydrogen is chosen as a standard reference and has electrode potential zero.
It is impossible to measure absolute electrode potential for an electrode without forming cell . Therefore it is assumed that standard electrode potential for hydrogen is zero
The standard reduction potential of a cell is determined by subtracting the standard reduction for the reaction at the anode from the standard reduction potential for the reaction at the cathode.
[tex]E_c_e_l_l[/tex]°[tex]= E_c_a_t_h_o_d_e[/tex]°[tex]- E_a_n_o_d_e[/tex]°
The species liking to get reduced is defined in term of standard reduction potential.
The species whose standard reduction potential is to be calculated is placed at cathode and at anode hydrogen electrode is used.
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Compare the purple and orange arrows. Does more energy go into breaking bonds, or is more energy released when new bonds form?
Answers
Answer:
The breaking of chemical bonds never releases energy to the external environment. Energy is only released when chemical bonds are formed. In general, a chemical reaction involves two steps: 1) the original chemical bonds between the atoms are broken, and 2) new bonds are formed. These two steps are sometimes lumped into one event for simplicity, but they are really two separate events. For instance, when you burn methane (natural gas) in your stove, the methane is reacting with oxygen to form carbon dioxide and water. Chemists often write this as:
CH4 + 2 O2 → CO2 + 2 H2O + energy
Explanation:
here is the answer
If i had 6 mol Cl2, how many mol FeCl3 would be made in:
2Fe+3Cl2-->2FeCl3
Answers
Answer:
4 mol FeCl3
Explanation:
[tex]6molCl_{2} *\frac{2mol FeCl_3}{3molCl_2}[/tex] = 4 mol FeCl3
Use the train-track method shown up above. We are simply setting up molar ratios derived from balanced equation to solve this.
Where is glycogen stored? (choose all that apply)
muscles
bones
organs
skin
Answers
A gas is contained in a horizontal cylinder with a moveable piston of cross-sectional area 0.33\text{ m}^20.33 m 2 . The region outside the cylinder is at standard ambient temperature and pressure, 298\text{ K}298 K and 1\text{ bar}1 bar. When 2040\text{ J}2040 J of heat flow into the gas, the internal energy of the gas increases by 1380\text{ J}1380 J. Calculate the distance through which the piston moves. You may assume friction is negligible.
Answers
Answer:
0.02 m
Explanation:
∆U = q + w
w = ∆U - q = (1380 - 2040) J = -660 J
w = -p∆V = -pA∆h
∆h = -w/(pA)
p = 1 bar × (100000 Pa/1 bar) = 100000 Pa
∆h = -(-660 J)/(100000 Pa×0.33 m²) = 0.02 m
A gas is contained in a horizontal cylinder with a moveable piston of cross-sectional area 0.33\text{ m}^20.33 m 2. The distance through which the piston moves is 0.02 m.
What is piston ?Among other related systems, pistons are found in reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders, and pneumatic cylinders. It is the moving part that is enclosed in a cylinder and sealed off from the gas by piston rings.
The piston, which is a part of combustion engines, transforms the energy released during combustion into a mechanical action and sends it, via the piston pin and connecting rod, to the crankshaft as a torsional force. The piston in the cylinder goes up and down when the engine is running.
The equation given by
∆ U = q + w
w = ∆ U - q
= ( 1380 - 2040 )
J = -660 J
w = -p∆V
= -pA∆h
∆h = -w / (pA)
p = 1 bar × ( 100000 Pa / 1 bar )
= 100000 Pa
∆h = - ( -660 J) / ( 100000 Pa × 0.33 m² )
= 0.02 m
Thus, The distance through which the piston moves is 0.02 m.
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PLEASE HELP
Which chemical reaction supports the Law of Conservation of Mass?
Answers
Answer:A
Explanation:
Balance the following equation: _H2+ __02 - __ H20
Answers
Answer:
2
H
2
+
O
2
=
2
H
2
O
Explanation:
From the original equation, you first need to write each component separately.
H
2
+
O
2
=
H
2
O
Left side: H = 2 ; O = 2 (number based on the subscript)
Right side: H = 2 ; O = 1 (number based on the subscripts; no subscript means that the element is just 1)
Notice that the number of H is already balance but the number of O is not. In order to balance the O, you need to multiply the element by 2, but you CANNOT do this by simply changing the subscript.
Hence,
H
2
+
O
2
=
2
H
2
O
Left side: H = 2 ; O = 2
Right side: H = 2 x 2 = 4 ; O = 1 x 2 = 2
Now, notice that the number of O is now balance (both are 2) but the number of H is not (since
H
2
O
is a substance and not an element, you need to multiply everything by 2). So, what to do?
You also multiply the left side H by 2. Hence,
2
H
2
+
O
2
=
2
H
2
O
Left side: H = 2 x 2 = 4 ; O = 2
Right side: H = 2 x 2 = 4 ; O = 1 x 2 = 2
The equation is now balanced.
In the equation C H4 + O2 C O2 + H2 O, what are the reactants?
O2--> C O2
C O2 + H2 O
C H4 + H2 O
C H4 + O2
Answers
Answer:
Explanation:
two advantage of tourist industry?
Answers
Explanation:
Two advantage of Tourist Industry:
Tourism is one of the largest and fastest growing industry in terms of generating more revenues, providing Large number of employment opportunities and only one major ways to development the nation within short spam of time. There are so many facts that, tourism helps making the country renowned all over the world and is called only one weapon to make country strong as from all the aspects.
Although, as we all know that, there are several facts and data's which shows that tourism is only one largest industry throughout world that generated huge amounts of Money than others. So what are the advantages of tourism? Which can be pointed out as following :-
1. Tourism helps to generate more revenues in the country.
2. The tourism can change the nation within a short time period.
3. Tourism helps to provide more numerous kinds of human resources in the nation.
4. Tourism is only one way to develop and to make renowned in the world
The volume of a gas is 2250 mL at 290 kPa what will the volume be when the pressure is reduced to .9 atm
Answers
Answer:
7178.22 mL
Explanation:
Applying,
PV = P'V'................. Equation 1
Where P = Initial pressureof gas, V = Initial volume of gas, P' = Final pressure of gas, V' = Final volume of gas.
make V' the subject of the equation
V' = PV/P'.............. Equation 2
From the question,
Given: V = 2250 mL, P = 290 kPa, P' = 0.9 atm = (101×0.9) = 90.9 kPa
Substitute these values into equation 2
V' = (2250×290)/90.9
V' = 7178.22 mL
The energy in biomass is used to make electricity. How is the energy stored in
biomass?
A. In chemical bonds
B. In the nucleus
C. As kinetic energy
D. As light energy
Answers
Answer:
In chemical bonds
Explanation:
A P E X
The energy in biomass is used to make electricity. The energy stored in
biomass in the form of chemical bonds.
What is biomass?Biomass was organic, which means it must be made up of material derived from living beings like plants as well as animals.
What is chemical bonds?
A chemical bond can be known as a long-term interaction involving atoms, ions, as well as molecules which allows chemical compounds to occur.
Biomass is made up of chemical energy that has been stored from the sun. Process called photosynthesis by which plants make biomass. Biomass can also be produced by burning for heat or processed into renewable liquid as well as gaseous fuels using a variety of techniques.
Therefore, the correct answer will be option A.
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A 10 M concentrated stock solution of NaCl is used to prepare 2 liters of diluted 1 M
solution. Which of the following is true for the process used to achieve the required
dilution? (5 points)
O The volume of the solvent used is less than 0.1 liters.
O The volume of stock solution used is less than 0.1 liters.
The volume of stock solution used is more than 2 liters.
The volume of the solvent used is less than 2 liters.
Answers
Answer: It is true for the process used to achieve the required dilution that volume of the solvent used is less than 2 liters.
Explanation:
Given: [tex]M_{1}[/tex] = 10 M, [tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 1 M, [tex]V_{2}[/tex] = 2 L
The volume of stock solution is calculated as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\10 M \times V_{1} = 1 M \times 2\\V_{1} = 0.2 L[/tex]
A solution which contains small amount of solute is called a dilute solution. Whereas a solution which contains more amount of solute is called a concentrated solution.
The stock solution is used for dilution and hence, it acts as a solvent. Its calculated volume is 0.2 L.
This means that volume of the solvent used is less than 2 liters.
Thus, we can conclude that it is true for the process used to achieve the required dilution that volume of the solvent used is less than 2 liters.
Answer: The volume of the solvent used is less than 2 liters.
Explanation:
5.(08.02 MC)
A 0.680 M Ca(OH)2 solution was prepared by dissolving 55.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution formed? (4 points)
O 1.09 liters
0 1.23 liters
2.01 liters
O 2.18 liters
Answers
Answer: 1.09 Liers
Explanation:
I did the problem and got it correct.
Answer:
A. 1.09
Explanation:
I did the Chemistry Exam
If this block has a mass of 173.7 grams, then what is this element??
Answers
Answer:
C
I am pretty sure that is the answer
The mass of the given cube of 173.7g and the volume of the box is 9 cm³.Then the density is 19.3 g/cm³. Therefore, the element with this density is gold. Option D is correct.
What is density?Density of a substance is the ratio of mass to its volume. Thus it tells about how much denser the substance is in the given volume. This physical quantity is dependant on mass, volume temperature and pressure.
The element have their own density corresponding to the mass and volume used. The dimensions of the given box is 3, 3 and 1. Thus volume is the product of this length, breadth and height.
Volume = 3 ×3 × 1
= 9 cm³.
Mass of the box is given 173.7 grams. Now, the density of the element is calculated as follows:
Density = 173.3 / 9 cm³
= 19.3 g/cm³.
From the table, it is clear that the this density corresponds to the element gold. Therefore, option D is correct.
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Add more drink mix until you notice a color change. Have you increased or decreased the concentration? (Higher number means a higher concentration).
Answers
Answer:
Increased the concentration
Explanation:
Complete Question
Open the simulation by pushing the play button. Begin by dragging the concentration tester overto the liquid and add drink mix until the concentration reaches approximately 2.oo mol/L. This means there are 2.00 moles of the drink mix in 1 Liter of the solution. Add more drink mix until you notice a color change. Have you increased or decreased the concentration? (Higher number means a higher concentration).
Solution
Drink mix is basically the solute which is added to solvent i.e water.
The higher is the amount of drink mix in the solvent, the higher is the concentration of the solute and hence darker is the color of the drink.
Hence, in the case the concentration of the drink has been increased.
If you have 2 water molecules together, would you expect them to sit "hydrogen by hydrogen" or "hydrogen to oxygen"? Why?
Answers
Answer:
"hydrogen to oxygen"
Explanation:
Hydrogen bonds are formed when hydrogen is bonded to highly electronegative element such as Chlorine, fluorine, oxygen etc.
In hydrogen bonding, the hydrogen atom of one molecule of water is attracted to the oxygen atom of another molecule of water via permanent dipole-dipole interaction.
Hence, If you have 2 water molecules together, they always sit "hydrogen to oxygen" as a result of dipole - dipole interaction and hydrogen bonding between water molecules.
Please help me ASAP State 2 uses of a retort
stand according to Chemistry
Answers
Answer:
2 uses of retort stand:
Retorts are used for distillation experiments (such as organic distillations) and titrations (where they hold a burette). They are also used as supports in filtration.What does an increase in temperature do to the reaction rate?
Answers
Answer:
An increase in temperature typically increases the rate of reaction because an increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision.Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.
Explanation:
Can you please give this answer a brainliest answer please
the cells are utilising _______ which are produced during the process of cell respiration
Answers
Answer:
sana nakatulong po sainyo
How to avoid the process of corrosion?
No Links please.
I needASAP!
Answers
Answer:
5 Different Types of Corrosion Prevention Methods
Barrier Coatings. One of the easiest and cheapest ways to prevent corrosion is to use barrier coatings like paint, plastic, or powder. ...
Hot-Dip Galvanization. ...
Alloyed Steel (Stainless) ...
Cathodic Protection. ...
EonCoat.
True or false intrusive igneous rock will never be found on Earth's surface?
Answers
Answer:
false
Explanation:
Answer:
false
Explanation:
lava is on the earth
which is following is used to cook food?
Answers
Answer: A process of cooking food in a pot made from unglazed and natural clay. coddling: Heating food in water kept just below the boiling point.
Explanation:
what is love?
A)don't hurt me
B)don't hurt me
C)No more
Answers
Answer:
C
Explanation:
I think it is a ever lasting process of pain and happiness cause the ones that are closest to you can make it hurt most but they can also make your day So probably
Giving Brainliest and 20 points to best answer with explanation.
What is the relationship between surface tension and Cohesion?
A. As cohesion increases, surface tension increases
B. As cohesion increased, surface tension decreases.
Answers
Answer:
A
Explanation:
Cohesion is basically the attraction of same molecules and surface tension occurs due to the attraction of molecules . Therefore as cohesion becomes high, surface tension becomes here. We can say then that Cohesion is directly proportional to surface tension