Atom 1 has 19 electrons 19 protons and 20 neutrons atoms 2 has 19 electrons , 20 neutrons and 19 protons
Answer:
Atom 1: Potassium (K)
Atom 2: Same thing
Explanation:
Potassium has an atomic number of 19 and mass number of 39.0983.
How many grams are in 3.21 x 1024 molecules of potassium hydroxide?
Answer:
3287.04 grams
Explanation:
The mass of 3.21 × 10²⁴ molecules of potassium hydroxide is equal to 298.5 g.
What is Avogadro's number?Avogadro’s constant can be explained as the proportionality factor that can be used to count the number of particles such as molecules, atoms, or ions in a given sample with a definite amount of substance.
Avogadro's number can be described as the approximate number of nucleons in 1 gram of substance. The value of the Avogadro constant can be expressed as the mass of one mole of a compound, in grams.
The value of Avogadro’s number is found about 6.022×10²³ mol⁻¹.
Given, the number of molecules of the KOH = 3.21 × 10²⁴
The mass of the one mole of KOH = 56 g/mol
The 6.022 × 10²³ molecules of KOH has mass = 56 g
The mass of 3.21 × 10²⁴ molecules of KOH = 56×(3.21× 10²⁴/6.022 × 10²³)
= 298.5 g
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balance this equation: Al+ HNO3 ---- H2 + Al(NO3)3
Answer:
2Al+ 6HNO3 ---- 3H2 + 2Al(NO3)3
Explanation:
Put coefficient a,b,c, and d for calculation:
a Al + b HNO3 = c H2 + d Al(NO3)3
for Al: a = d
for H: b = 2c
for N: b = 3d
for O: 3b = 9d
Suppose a=1, then d=1, b=3, c=3/2
multiply 2 to make all natural number, a=2, then b=6, c=3, d=2
What is the relationship between potential and kinetic energy?*
As potential energy increases, kinetic energy increases.
O As potential energy increases, kinetic energy decreases.
As potential energy decreases, kinetic energy decreases.
O Potential and kinetic energy are two separate things and have no relationship.
Answer:
As potential energy increases, kinetic energy decreases
It's an inverse relationship
What volume (in L) of water vapor will be
produced from the reaction of 24.65 L of oxygen?
2C2H6(9) + 702(9) — 4CO2(g) + 6H20(9)
Enter
Answer:
21.13 L
Explanation:
Step 1: Write the balanced equation
2 C₂H₆(g) + 7 O₂(g) ⇒ 4 CO₂(g) + 6 H₂O(g)
Step 2: Determine the appropriate volume ratio
Since all the gases are in the same container at the same temperature and pressure, the volume ratio is equal to the molar ratio, because the volume depends on the number of moles. The volume ratio of O₂(g) to H₂O(g) is 7:6.
Step 3: Determine the volume of H₂O produced from 24.65 L of O₂
24.65 L O₂ × 6 L H₂O/7 L O₂ = 21.13 L H₂O
A 100.0 mLflask is filled with 0.065 moles of A and allowed to react to form B according to the reaction below. The following experimental data are obtained for the amount of A as the reaction proceeds. What is the average rate of appearance of B in units of M/s between t = 10.0 min. and t = 30.0 min.? Assume that the volume of the flask is constant.
The question is incomplete. The complete question is :
A 100.0 mL flask is filled with 0.065 moles of A and allowed to react to form B according to the reaction below. The following experimental data are obtained for the amount of A as the reaction proceeds. What is the average rate of appearance of B in units of M/s between t = 10 min. and t = 30 min.? Assume that the volume of the flask is constant. A(g) → B(g)
Time 0.0 10.0 20.0 30.0 40.0
Moles of A 0.065 0.051 0.042 0.036 0.031
Solution :
Consider the following reaction as follows :
[tex]$A \rightarrow B$[/tex]
The experiment data is given as follows :
Time (min) : 0.0 10.0 20.0 30.0 40.0
Moles of A : 0.065 0.051 0.042 0.036 0.031
According to the rate of reaction concept, the rate can be expressed as a consumption of the reactant and formation of the product as follows :
Average rate : [tex]$= -\frac{d[A]}{dt} = \frac{d[B]}{dt} $[/tex]
Now we have to calculate the average rate between 10.0 to 30.0 min w.r.t. A as follows :
Rate [tex]$=-\frac{(0.051-0.036) mol \times \frac{1}{0.1 \ L}}{(30.0-10.0) mol \times \frac{60 \ s}{1 \ min}}$[/tex]
[tex]$=\frac{0.15 \ M}{20 \ min \times \frac{60 \ s}{1 \ min}}$[/tex]
[tex]$= 1.25 \times 10^{-4 }\ M/s$[/tex]
Therefore, the rate = [tex]$= 1.3 \times 10^{-4 }\ M/s$[/tex]
A 100.0-mL flask is filled with 0.065 moles of A and allowed to react to form B. Between 10.0 min and 30.0 min, the average rate of appearance of B is 1.3 × 10⁻⁴ M/s.
What is the rate of reaction?The rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.
Step 1: Write the balanced equation.A(g) → B(g)
Step 2: Calculate the rate of reaction of A (rate of disappearance of A).To calculate the rate of disappearance of A (rA) between 10.0 min and 30.0 min, we will use the following expression.
rA = -ΔnA / V. Δt = -(0.036 mol - 0.051 mol)/ (0.1000 L) (30.0 min - 10.0 min)
rA = 7.5 × 10⁻³ M/min
where,
ΔnA is the change in the number of moles of A.Δt is the change in time.Step 3: Calculate the rate of reaction of B (rate of appearance of B).The molar ratio of A to B is 1:1.
7.5 × 10⁻³ mol A/L.min × 1 mol B/1 mol A = 7.5 × 10⁻³ mol B/L.min
Step 4: Convert 7.5 × 10⁻³ M/min to M/sWe will use the conversion factor 1 min = 60 s.
7.5 × 10⁻³ M/min × 1 min/60 s = 1.3 × 10⁻⁴ M/s
A 100.0-mL flask is filled with 0.065 moles of A and allowed to react to form B. Between 10.0 min and 30.0 min, the average rate of appearance of B is 1.3 × 10⁻⁴ M/s.
The question is incomplete. The complete question is:
A 100.0 mL flask is filled with 0.065 moles of A and allowed to react to form B according to the reaction below. The following experimental data are obtained for the amount of A as the reaction proceeds. What is the average rate of appearance of B in units of M/s between t = 10 min. and t = 30 min.? Assume that the volume of the flask is constant. A(g) → B(g)
Time (min) 0.0 10.0 20.0 30.0 40.0
Moles of A 0.065 0.051 0.042 0.036 0.031
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In a hotel breakfast bar, you see an older woman sticking a fork into a toaster to remove a piece of toast. You warn her not to do that, and she says, "You know, I always wondered why forks conduct electricity so well." As an astute chemistry student, how would you explain it to her? Make sure you provide a relationship to electronegativity, proton pull, and electron distribution in your answer.
Answer:
See explanation
Explanation:
You see, all these materials we see around us are composed of elements. These elements are unique in their own ways!
Some of them are able to attract tiny negative particles called electrons close to their positive interior called the nucleus. This positive interior is so designated because it contains a positive particle called protons which attract these electrons.
Now, elements are broadly divided into metals and non metals. Protons in metallic elements are less able to pull electrons than protons in non metallic elements. As a result of this, non metals are mostly electronegative because they pull electrons towards themselves while metals are mostly electropositive because they give away their electrons easily. Fork is composed of metallic elements.
Since metals give away electrons easily, they can conduct electricity since electrons are the same charge carriers in electric circuits.
Also, in elements, there is a conduction band and a valence band. Electrons occupy the valence band but also move into the conduction band. The gap between the valence band and the conduction band in nonmetals is large hence they do not conduct electricity. The gap between the valence band and the conduction band in metals is minimal hence metals conduct electricity.
So if you stick that fork into a toaster, electrons can flow right through the toaster circuit into your body and cause you to be electrocuted.
An unknown compound is processed using elemental analysis and found to contain 117.4 g of platinum, 28.91 g of carbon, and 33.71 g of nitrogen. How many moles of platinum are present in the compound? Need help ASAP
Answer:
1 mole of platinum (Pt).
Explanation:
From the question given above, the following data were obtained:
Platinum (Pt) = 117.4 g
Carbon (C) = 28.91 g
Nitrogen (N) = 33.71 g
Number of mole of platinum =?
To obtain the number of mole of platinum present in the compound, we shall determine the empirical formula for the compound. The empirical formula for the compound can be obtained as follow:
Pt = 117.4 g
C = 28.91 g
N = 33.71 g
Divide by their molar mass
Pt = 117.4 /195 = 0.602
C = 28.91 /12 = 2.409
N = 33.71 /14 = 2.408
Divide by the smallest
Pt = 0.602 /0.602 = 1
C = 2.409 /0.602 = 4
N = 2.408 / 0.602 = 4
Therefore, the empirical formula for the compound is PtC₄N₄ => Pt(CN)₄
From the empirical formula for the compound (i.e Pt(CN)₄) we can see that the compound contains 1 mole of platinum (Pt).
When of a certain molecular compound X are dissolved in of benzene , the freezing point of the solution is measured to be . Calculate the molar mass of X. If you need any additional information on benzene, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits.
The question is incomplete. Here is the complete question.
When 2.10 g of a certain molecular compound X are dissolved in 65.0 g of benzene (C₆H₆), the freezing point of the solution is measured to be 3.5°C. Calculate the molar mass of X. If you need any additional information on benzene, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to 2 significant digits.
Answer: MM = 47.30 g/mol.
Explanation: There is a relationship between freezing point depression and molality. With this last one, is possible to calculate molar mass or molar weight of a compound.
Freezing Point Depression occurs when a solute is added to a solvent: the freezing point of the solvent decreases when a non-volatile solute is incremented.
Molality or molal concentration is a quantity of solute dissolved in a certain mass, in kg, of solvent. Its symbol is m and it's defined as
[tex]m=\frac{moles(solute)}{kg(solvent)}[/tex]
Freezing point depression and molal are related as the following:
[tex]\Delta T_{f}=K_{f}.m[/tex]
where
[tex]\Delta T_{f}[/tex] is freezing point depression of solution
[tex]K_{f}[/tex] is molal freezing point depression constant
m is molality
Now, to determine molar mass, first, find molality of the mixture:
[tex]\Delta T_{f}=K_{f}.m[/tex]
[tex]m=\frac{\Delta T_{f}}{K_{f}}[/tex]
For benzene, constant is 5.12°C/molal. Then
[tex]m=\frac{3.5}{5.12}[/tex]
m = 0.683 molal
Second, knowing the relationship between molal and moles of solute, determine the last one:
[tex]m=\frac{moles(solute)}{kg(solvent)}[/tex]
[tex]mol(solute)=m.kg(solvent)[/tex]
mol(solute) = 0.683(0.065)
mol(solute) = 0.044 mol
The definition for Molar mass is the mass in grams of 1 mol of substance:
[tex]n(moles)=\frac{m(g)}{MM(g/mol)}[/tex]
[tex]MM=\frac{m}{n}[/tex]
In the mixture, there are 0.044 moles of X, so its molecular mass is
[tex]MM=\frac{2.1}{0.044}[/tex]
MM = 47.30 g/mol
The molecular compound X has molecular mass of 47.30 g/mol.
PLZ HELP I WILL GIVE BRAINLISTS TO RIGHT ANSWER
2KCIO3 → 2KCI+ 302
How many moles of oxygen are produced by the decomposition of 5.0 moles of potassium chlorate?
A )7.5 mol O2
B )5.0 mol O2
C )2.5 mol O2
D )9.0 mol O2
Problem 3 A sample of 2.37 moles of an ideal diatomic gas experiences a temperature increase of 65.2 K at constant volume. (a) Find the increase in internal energy if only translational and rotational motions are possible. (b) Find the increase in internal energy if translational, rotational, and vibrational motions are possible. (c) How much of the energy calculated in (a) and (b) is translational kinetic energy?
Answer:
a) the increase in internal energy is 3211.78 J
b) dU = 3854.14 J
c) dU[tex]_{T}[/tex] = 1927.06 J
Explanation:
Given the data in question;
Foe a diatomic gas, the degree of freedom are as follow;
lets consider the positional degree of freedom
transitional df = 3
rotational df = 2
vibrational ff = 1
now, the internal energy given by;
U = Nf × 1/2NKT = Nf×1/2×nRT
where Nf is the number of degree of freedom
N is Number of atoms or molecules
n = number of molecules
L is Boltzmann constant
R is universal gas constant
so change in internal energy , change in T is given by
dU = Nf × 1/2 × nT dT
n = 2.37 moles
dT = 65.2 K
R = 8.314 J/mol.J
a)
Find the increase in internal energy if only translational and rotational motions are possible
since rotational and transitional motion are involved ;
Nf = 3(trasitional) + 2(rotational) = 5
so,
dU = 5 × 1/2 × nRdT
we substitute
dU = 5 × 0.5 × 2.37 × 8.314 × 65.2
dU = 3211.78 J
Therefore, the increase in internal energy is 3211.78 J
b)
Find the increase in internal energy if translational, rotational, and vibrational motions are possible.
Nf = 3 + 2 + 1 = 6
dU = 6 × 1/2 × nRdT
dU = 6 × 0.5 × 2.37 × 8.314× 65.2
dU = 3854.14 J
c)
How much of the energy calculated in (a) and (b) is translational kinetic energy?
dU[tex]_{T}[/tex] = 3 × 0.5 × 2.37 × 8.314 × 65.2
dU[tex]_{T}[/tex] = 1927.06 J
1. Consider Reactions 3 and 14 studied in this lab. Write the balanced molecular equation (identical to what you completed in the previous section), the complete ionic equation and the net ionic equation for these reactions. Include all physical states, and circle the spectator ions in the complete ionic equations.
Reaction 3: Aqueous sodium phosphate + aqueous copper(II) sulfate
Balanced Molecular Equation
(from page 1): Complete
Ionic Equation:
Net Ionic Equation:
Reaction 14: Aqueous iron(III) chloride + aqueous ammonium hydroxide
Balanced Molecular Equation
(from page 3): Complete
Ionic Equation:
Net Ionic Equation:
2. Predict the products for the following single and double displacement reactions, and write balanced molecular equations including physical states) for each of them. If you predict that no reaction will occur, write "NR", followed by a brief explanation.
A. Aluminum metal + aqueous silver acetate
B. Aqueous zinc nitrate + aqueous lithium chloride
C. Hydrobromic acid + solid magnesium sulfite
D. Aqueous rubidium hydroxide + perchloric acid
E. Tin metal + phosphoric acid
F. Aqueous lithium chromate + aqueous gold(111) iodide
Answer:
See explanation
Explanation:
For reaction 3;
Molecular equation
2Na3PO4(aq) + 3CuSO4(aq) -----> 3Na2SO4(aq) + Cu3(PO4)2(s)
Complete ionic equation;
6Na^+(aq) + 2PO4^3-(aq) + 3Cu^2+(aq) + 3SO4^2-(aq) ------> 6Na^+(aq) + 3SO4^2-(aq) + Cu3(PO4)2(s)
Net ionic equation;
3Cu^2+(aq) + 2PO4^3-(aq) -----> Cu3(PO4)2(s)
Reaction 14
Molecular equation
2FeCl3(aq) + 6NH4OH(aq) ------>2Fe(OH)3(s) + 6NH4Cl
Complete ionic equation:
2Fe^2+(aq) + 6Cl^-(aq) + 6NH4^+(aq) + 6OH^-(aq) -----> 2Fe(OH)3(s) + 6NH4^+(aq) + 6Cl^-(aq)
Net ionic equation;
2Fe^2+(aq) + 6OH^-(aq) -----> 2Fe(OH)3(s)
2.
Al(s) + 3Ag(CH3COO)(aq) ----->Al(CH3COO)3(aq) + 3Ag(s)
Zn(NO3)2(aq) +2LiCl(aq) ------> 2LiNO3(aq) + ZnCl2(aq)
2HBr(aq) + MgSO3(s) ------>MgBr2(aq) + H2O(l) + SO2(g)
RbOH(aq) + HClO4(aq) -----> RbClO4(aq) + H2O(l)
3Sn(s) + 4H3PO4(aq)----->Sn3(PO4)4(aq) + 6H2(g)
3Li2CrO4(aq) + 2AuI3(aq) -------> 6LiI(aq) + Au2(CrO4)3(s)
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what is the electron configuration for Na?
1s22s22p63s1. That's the ans
Mg(s)+2HCl(aq) → MgCl2(aq)+H2(g)
In an experiment, a student places a small piece of pure Mg(s) into a beaker containing 250.mL of 6.44MHCl(aq). A reaction occurs, as represented by the equation above. The student collects the H2(g) produced by the reaction and measures its volume over water at 298 K after carefully equalizing the water levels inside and outside the gas-collection tube. The volume is measured to be 45.6mL. The atmospheric pressure in the lab is measured as 765 torr, and the equilibrium vapor pressure of water at 298 K is 24 torr.
Calculate the following.
(i) The pressure inside the tube due to the H2(g)
(ii) The number of moles of H2(g) produced in the reaction
What is the answer and why?
Answer:
741 torr
0.81 moles of H2
Explanation:
Given the reaction equation;
Mg(s)+2HCl(aq) → MgCl2(aq)+H2(g)
We can obtain the pressure of the gas at 298 K using Dalton's law of partial pressures.
Pressure of gas + vapour pressure of water = 765 torr
vapour pressure of water = 24 torr
765 torr - vapour pressure of water = Pressure of gas
Pressure of gas = 765 torr - 24 torr = 741 torr
From the question we have;
number of moles of HCl reacted = Concentration * volume
number of moles of HCl reacted = 250/1000 * 6.44 = 1.61 moles
If
2 moles of HCl yields 1 mole of H2
1.61 moles of HCl yields 1.61 * 1/2 = 0.81 moles of H2
What observations did you make during the animation from Interphase back to interphase again?
Answer:
=> Production of protein occurs at interphase.
=> The interphase stage is longer than the four stages of mitosis.
Explanation:
There are three things that one has to understand in cell division and they are; the interphase stage, the four mitosis stages and the cytokinesis.
The interphase stage is the growing stage and it is really not part of mitosis. The interphase stage can be said to be the "resting stage" for cell division. The interphase stage consist of the G1(production of protein occurs here), S( this is the chromosome replication) and G2 ( for further growth).
The four stages of Mitosis are; prophase, metaphase, Anaphase and Telophase. These four stages shows how or the steps involved in the fomation of two new daughter chromosome in a cell.
Cytokinesis is the stage following mitosis and it is the division of the cell membrane into two new cells
what is heat transfer?
A. The transfer of heat from a colder object to a warmer one
B. The transfer of heat from a warmer object to a colder one
Identify the correct statement regarding the mole. a. A mole of oxygen gas contains 6.02 1023 atoms. b. A mole of chlorine gas contains 2 6.02 1023 atoms. c. A mole of carbon dioxide contains two moles of oxygen molecules. d. A mole of ammonia gas (NH3) has a mass of 34.0 g. e. A mole consists of the number of particles in exactly 12 g of naturally occurring carbon.
Answer:
b. A mole of chlorine gas contains 2 (6.02 * 10^23 ) atoms.
c. A mole of carbon dioxide contains two moles of oxygen molecules (CO2)
e. A mole consists of the number of particles in exactly 12g of naturally occurring carbon.
Explanation:
A mole of oxygen gas (O2) contains 2 (6.02 * 10^23) atoms
A mole of Ammonia gas (NH3) has a mass of 17.031g/mol
A mole is defined as the unit used in measurement of the amount of substances in the International System of Units.
A mole was initially defined as the number of particles in exactly 12g of naturally occurring carbon.
Therefore, options b, c and e are correct
which of the following describes all of the types of water found in the hydrosphere
Answer: all of the water on the Earth
Explanation:
The hydrosphere is made up of all the water that we have on Earth. Included in the hydrosphere are the water that we have underground, those in the Earth's surface, and those that we have in the air.
On Earth, we can find water in the seas, lakes, oceans, streams, rivers etc. Water also comes in form of rain as well.
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Manipulate the settings to model the scenario. Observe what happens to the objects in the stream. Record your
observations in the Lab Guide,
Stream Slope
Gentle
Amount of Rainfall
None
Surrounding Terrain
Plain
Mountains
Check
Pause
Answer:
It causes erosion of the land and stones.
Explanation:
if the objects such as stones etc are present in the way of stream so the stones are eroded due to its fast flowing due to sloppy nature. If the stream is flat then it little disturb the things present in its way because of its lower speed. If more rainfall occur the streams flows in higher speed and destroy everything that comes in its way and also affected the plains.
Answer:this is correct
Explanation:
A reaction between liquid reactants takes place at in a sealed, evacuated vessel with a measured volume of . Measurements show that the reaction produced of sulfur hexafluoride gas. Calculate the pressure of sulfur hexafluoride gas in the reaction vessel after the reaction. You may ignore the volume of the liquid reactants. Round your answer to significant digits.
Answer:
0.41 atm
Explanation:
A reaction between liquid reactants takes place at 10.0 °C in a sealed, evacuated vessel with a measured volume of 5.0 L. Measurements show that the reaction produced 13. g of sulfur hexafluoride gas. Calculate the pressure of sulfur hexafluoride gas in the reaction vessel after the reaction. You may ignore the volume of the liquid reactants. Round your answer to 2 significant digits.
Step 1: Given data
Temperature (T): 10.0 °CVolume of the vessel (V): 5.0 LMass of sulfur hexafluoride gas (m): 13. gStep 2: Convert "T" to Kelvin
We will use the following expression.
K = °C + 273.15
K = 10.0 °C + 273.15 = 283.2 K
Step 3: Calculate the moles (n) of SF₆
The molar mass of SF₆ is 146.06 g/mol.
13. g × 1 mol/146.06 g = 0.089 mol
Step 4: Calculate the pressure (P) of SF₆
We will use the ideal gas equation.
P × V = n × R × T
P = n × R × T/V
P = 0.089 mol × (0.0821 atm.L/mol.K) × 283.2 K/5.0 L = 0.41 atm
How many grams are there in 1.70 moles of KMnO4?
Answer:
269g
Explanation:
hope this helps you
In the United States, barometric pressures a re generally reported in inches of mercury (in. Hg). On a beautiful summer day in Chicago, the barometric pressure is 30.45 in. Hg. Convert this pressure to torr.
Answer:
773.43 torr
Explanation:
From the question given above, the following data were obtained:
Pressure (in inHg) = 30.45 inHg
Pressure (in torr) =?
We can convert 30.45 inHg to torr by doing the following:
1 inHg = 25.4 torr
Therefore,
30.45 inHg = 30.45 inHg × 25.4 torr / 1 inHg
30.45 inhg = 773.43 torr
Thus, 30.45 inhg is equivalent to 773.43 torr
A solid piece of lead has a mass of 32.00 g and a volume of 2.84 cm^3. From these data, calculate the density of lead in SI units (kilograms per cubic meter).
Answer:
11267.61 Kg/m³.
Explanation:
From the question given above, the following data were obtained:
Mass of lead = 32 g
Volume of lead = 2.84 cm³
Density of lead =.?
Next, we shall convert 32 g to Kg. This can be obtained as follow:
1000 g = 1 Kg
Therefore,
32 g = 32 g × 1 Kg / 1000 g
32 g = 0.032 Kg
Next, we shall convert 2.84 cm³ to m³. This can be obtained as follow:
1 cm³ = 10¯⁶ m³
Therefore,
2.84 cm³ = 2.84 cm³ × 10¯⁶ m³ / 1 cm³
2.84 cm³ = 2.84×10¯⁶ m³
Finally, we shall determine the density of the piece of lead. This can be obtained as follow:
Mass of lead = 0.032 Kg
Volume of lead = 2.84×10¯⁶ m³
Density of lead =.?
Density = mass / volume
Density of lead = 0.032 / 2.84×10¯⁶
Density of lead = 11267.61 Kg/m³
g Aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water . Suppose 57.4 g of hydrobromic acid is mixed with 41. g of sodium hydroxide. Calculate the minimum mass of hydrobromic acid that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits.
Answer:
Zero
Explanation:
The complete reaction for this is as follows -
HBr + NaOH = NaBr + H2O
1 mole of NaOH reacts with 1 mole of HBr
m(HBr) = 57.4g and M(HBr) = 80.9g/mol
m(NaOH) = 16g and M(NaOH) = 40g/mol
Number of moles = m/M
Substituting the given values we get -
n(HBr) = 57.4 g/80.9 g/mol = 0.709
n(NaOH) = 16 g/40 g/mol = 0.4
n(H2O) = n(NaOH) = 0.40 mol
According to balanced equation
40 gram of NaOH reacts with 81 grams of HBr
41 gram of NaOH will react with 81/40 * 41 = 83.025 gram of HBr
We have only 57.4 g of HBr only hence, 0 HBr will be left.
1. Describe how you can use the graduated cylinder to determine the volume of a small, irregularly-shaped metal. 2. What safety precaution should you take when adding the irregularly-shaped metal into the glass graduated cylinder
Explanation:
1.
i. Measure the initial volume of water in a graduated cylinder.
ii. Now submerge the irregularly shaped metal into water in a graduated cylinder.
iii. Measure the final volume of water.
iv. The difference between the final volume and the initial volume is the volume of the irregularly shaped metal.
2.
When adding the irregularly shaped metal into the glass graduated cylinder. Make sure that the irregularly shaped metal is completely submerged into the water.
Which statement correctly compares electric charge with electric current?
A: They both require a human to make them.
B: Neither require charged particles.
C: They both require a battery and a bulb.
D: They both require a movement of charged particles.
Please help
Answer:
D
Explanation:
i have no explanation ;-;
I checked it with my quiz doe UwU[tex]e[/tex]
The energy stored in an object is called potential energy
True or false
its true
Potential energy is the stored or latent energy in an object at rest. It’s fundamental to many physics-related concepts because its laws hold true on any level, from the planetary to the atomic level. The potential energy of an object is measurable.
In biology class, we had to______ the parts of a plant cell under a microscope.
Answer:
In biology class we had to look at the parts of a plant in a microscope
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a) The rows on the periodic table are called periods. How many energy levels are in the atoms of each element in period 2 (lithium-neon)
b) What is the group number of the halogens?
c) What do the elements in each group have in common?
please please help me, i will give brainliest
Answer:
A two energy levels K and L
B halogen are present in group 17
C in same group elements have same valence electrons
Explanation: