What is the mole fraction (Χ) of CH3OH, methanol, in a solution of 9.00 mL of CH3OH and 6.79 g of C6H5COOH, benzoic acid ? Density of methanol is 0.792 g/mLMolar mass of CH3OH is 32.04 g/molMolar mass of C6H5COOH is 122.12 g/mol
Answers
The mole fraction of \(CH_3OH\)in the given solution is 0.799.
To calculate the mole fraction of \(CH_3OH\)in the given solution, we need to first find the moles of CH3OH and benzoic acid present in the solution.
The number of moles of CH3OH can be calculated using the given volume and density as follows:
moles of CH3OH = (volume of CH3OH in mL) x (density of CH3OH in g/mL) / (molar mass of CH3OH in g/mol)
= (9.00 mL) x (0.792 g/mL) / (32.04 g/mol)
= 0.2217 mol
The number of moles of benzoic acid can be calculated using its given mass and molar mass as follows:
moles of \(C_6H_5COOH\)= (mass of C6H5COOH in g) / (molar mass of \(C_6H_5COOH\) in g/mol)
= 6.79 g / 122.12 g/mol
= 0.0556 mol
Now, the total number of moles of solute in the solution is:
total moles of solute = moles of CH3OH + moles of C6H5COOH
= 0.2217 mol + 0.0556 mol
= 0.2773 mol
Therefore, the mole fraction of CH3OH in the solution can be calculated as:
mole fraction of CH3OH = moles of CH3OH / total moles of solute
= 0.2217 mol / 0.2773 mol
= 0.799
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Related Questions
. If 980,000 J of energy are added to 6200 g of water at 291 K, what will the final temperature of the water be? The specific heat of water is 4.18 J/(g x oC)
Answers
Answer:
Final temperature = T₂ = 328.815 K
Explain the solute and the solvent in a solution
Answers
Answer:
a solute is a substance that is dissolved in the solvent (liquid)
a solvent is a substance that dissolves a solute (solid)
a solution is the mixture of both the solute and solvent forming uniform mixture
What is Decomposition Reaction
Answers
Answer:
Explanation:
Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.
The decomposition reaction can be represented by the general equation:
AB → A + B
Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.
There are different types of decomposition reactions, including:
Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):
CaCO3 → CaO + CO2
Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):
2H2O → 2H2 + O2
Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:
Cl2 → 2Cl
These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.
Answer:
Explanation:
reaction in which a compound breaks down into simpler substances or elements
Can somebody help me please
Answers
Answer:
0.1139952 is the answer
Explanation:
in this experiment, you used 45.0 ml of 1.00 m hcl in each trial. calculate the mass of mg that would produce the maximum amount of heat with 45.0 ml of 1.00 m hcl. the molar mass of magnesium is 24.305 g/mol.
Answers
The mass of magnesium that would produce the maximum amount of heat is 0.547 grams.
The chemical reaction between magnesium and HCl is
Mg + 2 HCl → MgCl₂ + H₂
In stoichiometry, the Avogadro's law said that the coefficient for every subtances in the reaction is the ratio for the number of moles for every subtances.
For HCl
The volume = V = 45.0 mL = 0.045 LThe molarity = M = 1.00 MThe number of molesn = MV
n = 1.00 × 0.045
n = 0.045 mol
For Mg
The molar mass = Mr = 24.305 grams/molThe number of molesn Mg : n HCl = 1 : 2
n Mg = n HCl ÷ 2
n Mg = 0.045 ÷ 2
n Mg = 0.0225 molThe mass of Mg
m = n × Mr
m = 0.0225 × 24.305
m = 0.547 grams
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a 34.0 ml sample of a 0.484 m aqueous acetic acid solution is titrated with a 0.451 m aqueous barium hydroxide solution. what is the ph after 6.09 ml of base have been added?
Answers
The pH of the base is 4.42.
No of moles of CH₃COOH = 47.0mL x L/1000L x 0.313 mol/L = 0.0147 mol
No of moles of OH⁻ added = 4.97 mL x L/1000 mL x (0.481 mol Ba(OH)₂)/L × (2 mol OH⁻)/(1 mol Ba(OH)₂) = 0.00478 mol
CH₃COOH + OH⁻ → CH₃C00⁻ + H₂O
Total volume = 47.0 mL + 4.97 mL = 51.97 mL = 0.05197 L
Concentration of CH₃COOH, [CH₃COOH] = 0.00992 mol/0.05197 L = 0.191M
Concentration of CH3C00⁻, [CH3C00⁻] = 0.00478 mol/0.05197 L = 0.0920 M
pKᵇ, of CH₃COOH = -log Kₐ = -log (1.8x10⁻⁵) = 4.74
According to Henderson equation,
pH = pKₐ + log [CH3C00⁻] / [CH₃COOH]
= 4.74 + log 0.0920 / 0.191 = 4.42
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A roller coasters velocity at the top of a hill is 21mls. Two seconds later it reaches the bottom of the hill with a velocity of 36mls. What is the acceleration of the roller coasters
Answers
Answer:
7.5 m/s²
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 21 m/s
Final velocity (v) = 36 m/s
Time (t) = 2 secs
Acceleration (a) =..?
The acceleration of an object is simply defined as the rate of change of velocity of the object with time. Mathematically, it is represented as:
Acceleration (a) = (final velocity (v) – initial velocity (u)) / time (t)
a = (v – u)/t
With the above formula, we can determine the acceleration of the roller coaster as follow:
a = (v – u)/t
a = (36 – 21)/2
a = 15/2
a = 7.5 m/s²
Therefore, the acceleration of the roller coaster is 7.5 m/s².
How many atoms are in 5.31 mol of Iron?
Answers
Answer:
3.77 moles of Fe contain 2.27 × 10, 24 as an exponent
the acidity of a solution reflects the concentration of free hydrogen ions in the solution. T/F?
Answers
True. the acidity of a solution reflects the concentration of free hydrogen ions in the solution.
The acidity of a solution is determined by the concentration of free hydrogen ions (H+) in the solution. When an acid dissolves in water, it releases H+ ions, which are responsible for the acidic properties of the solution.
The higher the concentration of H+ ions, the more acidic the solution is. Acidity is commonly measured using the pH scale, which quantifies the concentration of H+ ions in a logarithmic manner.
A lower pH value indicates a higher concentration of H+ ions and a stronger acidity, while a higher pH value corresponds to a lower concentration of H+ ions and a more alkaline (basic) solution.
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What is a substance and what are the two types of substances?
Answers
21. What is the frequency, given 2-3 x 10¹m? Show all work
Answers
Answer:
Frequency is 2Hz
Explanation:
Look at the activity series and select which two of the following reactions
would happen on their own. (Remember, if the lone element is more active
than the metal in the compound, the lone element will react and replace the
metal in the compound.)
The Activity Series
Most Active
Lithium (Li)
Potassium (K)
Calcium (Ca)
Sodium (Na)
Aluminum (AI)
Zinc (Zn)
Iron (Fe)
Tin (Sn)
Lead (Pb)
(Hydrogen) (H)
Copper (Cu)
Silver (Ag)
Gold (Au)
Least Active
O A. 2Li + ZnBr2 + 2LiBr + Zn
B. 3Ca+ Al2O3 + 2Al + 3Cao
C. Al +3LICI - AlCl3 + 3Li
D. Sn + ZnSe → SnSe + Zn
Answers
Answer:
b
Explanation:
because the correct answer
Look at the two diagrams below. Diagram 1 shows the locations of earthquakes and diagram 2 shows the locations of volcanoes around the world. Use the diagrams and what you know to select all statements that are true.
Look at the two diagrams below. Diagram 1 shows the locations of earthquakes and diagram 2 shows the locations of volcanoes around the world. Use what the diagrams and what you know to select all statements that are true.
Group of answer choices
Volcanoes and earthquakes often occur near the same places.
Volcanoes are never found near where earthquakes occur
Volcanoes and earthquakes often occur where two plates meet.
Earthquakes and volcanoes are frequent along The Ring of Fire
Volcanoes prevent earthquakes from occurring.
Group of answer choices
Volcanoes and earthquakes often occur near the same places.
Volcanoes are never found near where earthquakes occur
Volcanoes and earthquakes often occur where two plates meet.
Earthquakes and volcanoes are frequent along The Ring of Fire
Volcanoes prevent earthquakes from occurring.
Answers
Answer:
where two plates meet and ring of fire
Answer:
1. Volcanoes and earthquakes often occur where two plates meet.
Explanation:
2. Earthquakes and volcanoes are frequent along The Ring of Fire
PLZ HELP FAST BRANILIST IF RIGHT
Wegener found the fossilized remains of a reptile and a plant on different continents which are now separated by thousands of miles of ocean. The reptiles and plants could not have possibly crossed the oceans. What kind of evidence is this an example of? *
A climate
B puzzle
C fossil
Answers
Answer:
Climate?
Explanation:
A German scientist who proposed the theory of continental drift ... Land reptile fossil located on multiple continents; evidence of continental drift ... climate evidence. Tropical plant fossils found on an island in Arctic Ocean, and glacier deposits ... Lystrosaurus (fresh water reptiles) found in places now separated by oceans
An ethylene glycol solution contains 30.8 g of ethylene glycol (C2H6O2) in 96.6 mL of water. (Assume a density of 1.00 g/mL for water.) Determine the freezing point of the solution. Determine the boiling point of the solution
Answers
The freezing point of the solution is -11.8 °C.
The boiling point of the solution is 103.31 °C.
To determine the freezing point of the solution, we can use the equation:
ΔTf = Kf * m
where:
ΔTf is the freezing point depression,
Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),
m is the molality of the solution (moles of solute per kilogram of solvent).
First, let's calculate the molality (m) of the solution:
Molar mass of ethylene glycol (C2H6O2):
C = 12.01 g/mol
H = 1.01 g/mol (x 6) = 6.06 g/mol
O = 16.00 g/mol (x 2) = 32.00 g/mol
Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol
Number of moles of ethylene glycol (C2H6O2) = mass / molar mass
Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol
Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g
Now, let's calculate the molality:
Molality (m) = moles of solute / mass of solvent (in kg)
Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg
Now we can calculate the freezing point depression (ΔTf):
ΔTf = Kf * m
ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C
To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):
Freezing point = 0 °C - 11.8 °C = -11.8 °C
To determine the boiling point of the solution, we can use the equation:
ΔTb = Kb * m
where:
ΔTb is the boiling point elevation,
Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),
m is the molality of the solution (same value as calculated before: 6.36 mol/kg).
ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C
To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):
Boiling point = 100 °C + 3.31 °C = 103.31 °C
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Brian is making a cake for his friend's birthday. He combines the ingredients for the cake and then pours the batter into two pans and bakes them for 45 minutes in the oven. While the pans are in the oven, he combines butter, sugar, and milk and mixes them together to make the icing. What type of changes created the cake and the icing?
A. Both the icing and the cake are formed by physical changes.
B. Both the icing and the cake are formed by chemical changes.
C. The icing is formed by a chemical change and the cake is formed by a physical change.
D. The cake is formed by a chemical change and the icing is formed by a physical change.
Answers
Answer:
it’s D.The cake is formed by a chemical change and the icing is formed by a physical change
Explanation:
It’s because when the cake was baking there was nothing physical about it so it was a chemical change the icing is formed by a physical change because all you did was mix three ingredients together
The type of changes that created the cake and the icing is;
Option D; The cake is formed by a chemical change and the icing is formed by a physical change.
This is about understanding type of changes in chemistry.
Physical change is defined as a change that affects the form of a compound or element but it doesn't affect its' chemical composition.Meanwhile, chemical change is defined as a change that affects the composition of a compound and a new substance is formed.Now, for brian's cake he has combined raw ingredients into two pans and bakes the cake. For the cake to be baked, it means the ingredients mixed have changed from liquid to solid and also a new substance has been formed. Thus, we can say that the cake was formed from chemical change.Meanwhile, the icing was formed by physical change because it did not undergo any chemical process and no new substance was formed as only butter, sugar and milk were mixed together.Read more at; https://brainly.com/question/19046658
a physiciist is studying the nature of static discharge by appying a volatge across a microscopic tube filled with nitrogen
Answers
The process that correctly describes the growth in the number of ionized nitrogen molecules over time is D. The number of ionized molecules increases exponentially with each ionized molecule ionizing 3 other molecules every nanosecond.
Let's analyze the equation tN2 = 3⋅N, where N is the number of ionized molecules and t is the time in nanoseconds.
The equation states that the number of ionized molecules at time t is equal to 3 times the number of ionized molecules at the previous time step.
This implies that each ionized molecule ionizes 3 other molecules every nanosecond.
A physicist is studying the nature of static discharge by applying a voltage across a microscopic tube filled with nitrogen.
Static discharge is an event that takes place when there is a sudden flow of electric charge between two objects with different electrical potentials. This electric charge transfer results in a brief burst of electromagnetic energy (EMI or EMF), which can sometimes be observed as a visible spark in low-light conditions or heard as a crackling sound in high-quality audio systems.
The nature of static discharge is dependent on a variety of factors, including the composition of the material, the temperature and humidity, the electrical potential between the two objects, and the distance between the objects. Typically, static discharge occurs more frequently in environments with low humidity, such as during the winter months or in arid regions, as moisture acts as an insulator and prevents the buildup of electrical charge. In addition, materials that are good electrical conductors, such as metals, are more likely to experience static discharge than materials that are poor conductors, such as plastics or rubber.
Therefore, the correct description of the growth in the number of ionized nitrogen molecules over time is:
D. The number of ionized molecules increases exponentially with each ionized molecule ionizing 3 other molecules every nanosecond.
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Complete question is:
" physicist is studying the nature of static discharge by applying a voltage across amicroscopic tube filled with nitrogen molecules.Every nanosecond from then on, any ionized molecules willionize an additional number of molecules not already ionized, and ionization does not get lost.The equationtN2 3shows N, the number of ionized molecules, t nanoseconds after initiating a voltage.Which of thefollowing correctly describes the growth in the number of ionized nitrogen molecules over time?A.The number of ionized molecules increases linearly with each ionized molecule ionizing 2 other moleculesevery nanosecond.B.The number of ionized molecules increases linearly with each ionized molecule ionizing 3 other moleculesevery nanosecond.C.The number of ionized molecules increases exponentially with each ionized molecule ionizing 2 othermolecules every nanosecond.D.The number of ionized molecules increases exponentially with each ionized molecule ionizing 3 othermolecules every nanosecond."
hello, I need help with this question
Answers
Answer:
carnivores organism get their energy from eating other organisms..
Draw the product of the hydrogenation of cis‑2‑pentene. Draw all hydrogen atoms.
Answers
Addition of hydrogen atom into unsaturated compounds is known as hydrogenation
When hydrogen is added into unsaturated compounds like alkenes and alkynes ; double bond of alkene and triple bond of alkynes vanishes and hydrogen is added to them to make them saturated compounds.
When hydrogen is added to cis-2-pentene the product will be pentane.
catalyst used in the process of hydrogenation is platinum ,palladium or nickel. Catalyst is required to carry out this reaction if catalyst id not used than this reaction will carried at very high temperature. Raney-nickel catalyzed hydrogenations require high pressure.
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Elements in Group IIA (also known as Group 2, or the alkaline earth metals) have similar properties because they all have the same number of ____
(multiple choice)
A. valence electrons
B. electrons
C. electrons needed to fill their octet
D. electron shells
Answers
Answer:
Electrons in their outer shell
Explanation:
They have similar properties they have the same number of electrons in their outermost shell.
What volume will 2.0 moles of nitrogen occupy at 720 torr and 20.0°c? formula: pv = nrt (r = 62.396 l•torr/mol•k) 3.5 l 6.6 l 48 l 51 l
Answers
The ideal gas law is the state equation of a hypothetical ideal gas. The volume of the nitrogen gas is 51 I.
What is the ideal gas equation?The general gas equation, commonly known as the ideal gas law, is the state equation of a hypothetical ideal gas. The ideal gas equation is formulated as:
PV = nRT
In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
As it is given that the pressure on the nitrogen is 720 torr, the temperature of the gas is 20°C(293 k), and the moles of nitrogen are 2.0 moles. Therefore, using the ideal gas equation the volume of the nitrogen can be written as,
\(pv=nRT\\\\v = \dfrac{nRT}{p}\\\\v = \dfrac{2 \times 62.396 \times 293}{720}\\\\v = 50.7834 \approx 51\)
Thus, the volume of the nitrogen gas is 51 I.
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Answer:
answer in picture
Explanation:
I JUST NEED HELP!!! ASAP!!
Gold and chlorine form the ionic compound AuCl3. What's the name of this compound in the common system?
Question 20 options:
A)
Aurous chloride
B)
Gold(I) chloride
C)
Gold(III) chloride
D)
Auric chloride
its either C) or D) i need help
Answers
Answer:
Auric chloride
Explanation:
took the test
If you add a chunk of zinc to a beaker of acid and zinc shavings to another beaker of acid, the sample with the zinc shavings will react faster. What property causes the increase in rate?.
Answers
Answer: surface area
Explanation:
The smaller the surface area the faster the rate of reaction. The zinc shavings have a smaller surface area of reactants compared to the large piece of zinc. The smaller surfaces area of reactants ensures that it comes into close proximity with the acid solution for reaction to take place.
identify the oxidizing agent in the following reaction: zn (s) cucl2 (aq) --> zncl2 (aq) cu (s)
Answers
The oxidizing agent in the given reaction is CuCl2.
In the reaction, Zinc (Zn) is being oxidized to form Zn2+ ions.
This means that Zn is losing electrons to form Zn2+.
This makes Zn the reducing agent .
On the other hand, Cu2+ ions are gaining electrons to form solid copper (Cu). This makes Cu2+ ions the oxidizing agent.Thus, the balanced equation is given below:Zn (s) + CuCl2 (aq) → ZnCl2 (aq) + Cu The oxidizing agent in the reaction: Zn (s) + CuCl2 (aq) → ZnCl2 (aq) + Cu (s) is CuCl2.
:In the given reaction, Zinc is oxidized and Copper ions are reduced, therefore the oxidizing agent is CuCl2.The oxidation half reaction is given below: Zn(s) → Zn2+(aq) + 2e-Reduction half reaction is given below: Cu2+(aq) + 2e- → Cu(s)CuCl2 gets reduced to Cu and Zinc gets oxidized to form Zn2+ ions.
Summary:Thus, the oxidizing agent in the given reaction is CuCl2.
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The following reaction shows sodium hydroxide reacting with sulfuric acid.
4NaOH + 2H₂SO₄ --> 2Na₂SO₄ + 4H₂O
How many grams of Na₂SO₄ are produced from 8.50 grams of NaOH?
Show all steps for full credit
Answers
The amount of Na₂SO₄ would be 15.09 grams
Stoichiometric calculationFrom the equation of the reaction:
4NaOH + 2H₂SO₄ --> 2Na₂SO₄ + 4H₂O
Mole ratio of NaOH and Na₂SO₄ = 2:1
Mole of 8.50 grams of NaOH = 8.50/40
= 0.21 mole
Equivalent mole of Na₂SO₄ = 0.21/2
= 0.11 mole
Mass of 0.11 mole Na₂SO₄ = 0.11 x 142.04
= 15.09 grams
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i need help pls
its due tomorrow i wanna get the answer right pls.
Answers
Answer:
1) Without our atmosphere we wouldn't have life! The atmosphere protects our earth from letting harmful substances or rocks into our planet, which could cause damage.
2) You interact with the atmosphere in both good ways and bad. You interact by putting up things like flowers and trees, but in bad ways by releasing bad things (like carbon dioxide) and by light pollution!
3) The factors that can affect climate of an area, by latitude and longitude!
Explanation:
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identufy the nucelophile and electrophile sites in the substrate and reagant of the following reaction
Answers
identufy the nucelophile and electrophile sites in the substrate and reagant of the following reaction Nucleophiles and Electrophiles
What is Nucleophiles and Electrophiles?Since they lack an electron, electrophiles can accept an electron pair from an electrophile. Carbocations and carbonyl compounds are two examples. An electron-rich species called a nucleophile gives electron pairs to an electron-poor species. Examples include cyanide ions, water, carbanions, and ammonia. A chemical substance known as a nucleophile gives an electron pair in response to an external stimulus to create a chemical connection. An electrophile is a molecule, ion, or atom that has a deficit in electrons in some way.
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Knowing that one day is 24 hours and one hour is 60 minutes, how many minutes are in 3.1 days?Knowing that one day is 24 hours and one hour is 60 minutes, how many minutes are in 3.1 days?
Answers
Answer:
4464 min
Explanation:
24 hr/day * 60 min/ hr * 3.1 day = 4464 min
Knowing that one day is 24 hours and one hour is 60 minutes, there would be 4464 minutes in the 3.1 days.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind.
It is determined by convention or regulation.
As given in the problem , knowing that one day is 24 hours and one hour is 60 minutes, then we have to find out there are how many minutes in 3.1 days,
1 day = 24 hours
1 day = 24 ×60 minutes
3.1 days = 3.1 ×24×60 minutes
= 4464 minutes
Thus, there are 4464 minutes in 3.12 days.
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how resonance helps a musician produce music on guitar?
Answers
Answer:
So the resonance phenomenon is what allows for notes to be produced on a musical instrument at all. A guitar though makes an additional use of resonance. The body of the guitar is carefully designed to resonate when notes are played on the strings. The reason is that the body can then behave as an amplifier for the strings.
Explanation:
reference = socratic . org
State the 2 products formed when a metal reacts with water
Answers
Answer:
hydroxide and hydrogen
Explanation:
When a metal reacts with water, a metal hydroxide and hydrogen are formed. Sodium reacts vigorously with water.
Answer: Hydrogen Gas ( H2)
Explanation: When metals react with water they form hydrogen gas which actually react and start to burn and make squeaky pop noises.