Answer:
MAKE ME BRAINLIEST TOOK TIME!!!!
Explanation:
A1) When magnesium reacts with oxygen, it produces light bright enough to blind you temporarily. Magnesium burns so bright because the reaction releases a lot of heat. As a result of this exothermic reaction, magnesium gives two electrons to oxygen, forming powdery magnesium oxide (MgO).
A2) magnesium oxide
A3) Do not return chemicals to their original packaging. An incompatible mixture may accidentally be formed.
Keep chemical containers closed. Dust and vapour may escape from an open container, while gases and suspended material may penetrate this, causing the nature of the chemical to change. This will also avoid unnecessary exposure.
Never use a wrong or an unmarked reagent. If you are unsure about the compound, do not use it. Instead, have it disposed of (see Disposal of Hazardous Waste).
Never put spatulas, stirrers or other objects into a storage container for chemicals. Remove the contents by pouring and rolling the contents of the glass into a beaker, glass container or other suitable equipment. Spatulas may be used with caution in laboratory reagent containers. Remember the labelling (see the Safety Rules for working in lab).
Once removed from the bottle or glass, cork stoppers must be placed on a clean surface (e.g. a watch glass or other suitable equipment) with the opening facing down. This is to avoid contamination of the compound and unnecessary exposure.
Chemical bottles must not be carried by the neck of the bottle, nor next to your body. Suitable carrying arrangements should be employed, e.g. buckets or trolleys.
When pouring from bottles, the label should always face upward to prevent any spillage from destroying the label.
Never put any chemicals in the bottle other than the one indicated on the label.
Special precautions should be taken when handling concentrated acids. Dilution of acids should be performed by pouring the acid into water and stirring continuously.
Flame __________ __________ is an instrumental method of analysing metal ions in solutions. What are the 2 missing words in this sentence?
Answer:
emission spectroscope
Explanation:
The flame emission spectroscope is a scientific instrument based on flame testing.
ID: A
8. Gold is reacted with chlorine gas according to the reaction 2 Au + 3Cl2 → 2 AuClz. Use the data in the table
to determine the percent yield of gold chloride.
Mass of Gold
Mass of Chlorine Theoretical Yield Actual Yield
39.4 g
?
35.2 g
21.3 g
a. 60.7%
b. 54.1 %
c. 58.1 %
d. 51.4 %
9. How many moles of Al would be produced from 20 moles of AlO3?
A. The percentage yield of gold chloride is 58%
B. The number of mole of Al produced is 40 moles
A. How to determine the percentage of gold2Au + 3Cl₂ → 2AuCl₃
Molar mass of Au = 197 g/mol
Mass of Au from the balanced equation = 2 × 197 = 394 g
Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol
Mass of Cl₂ from the balanced equation = 3 × 71 = 213 g
Molar mass of AuCl₃ = 197 + (3×35.5) = 303.5 g/mol
Mass of AuCl₃ from the balanced equation = 2 × 303.5 = 607 g
We'll begin by determining the limiting reactant
From the balanced equation above,
394 g of Au reacted with 213 g of Cl₂
Therefore,
39.4 g of Au will react with = (39.4 × 213) / 394 = 21.3 g of Cl₂
From the above, both Au and Cl₂ are limiting reactant.
Next, we shall determine the theoretical yield.
From the balanced equation above,
394 g of Au reacted to produce 607 g of AuCl₃
Therefore,
39.4 g of Au will react to produce = (39.4 × 607) / 394 = 60.7 g of AuCl₃
Thus, the theoretical yield of AuCl₃ is 60.7 g
Finally, we shall determine the percentage yield.
Actual yield = 35.2 g
Theoretical yield = 60.7 g
Percentage yield =?
Percentage yield = (Actual / Theoretical) × 100
Percentage yield = (35.2 / 60.7) × 100
Percentage yield = 57.99%
Percentage yield ≈ 58%
B. How to determine the mole of Al producedBalanced equation
2Al₂O₃ → 4Al + 3O₂
From the balanced equation above,
2 moles of Al₂O₃ produced 4 moles of Al
Therefore,
20 moles of Al₂O₃ will produce = (20 × 4) / 2 = 40 moles of Al
Thus, 40 moles of Al were obtained from the reaction.
Learn more about stoichiometry:
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Sodium Hydroxide, which is a base, has a pH of _____
a
2
b
3
c
14
d
6
Answer:
c
Explanation:
Given that sodium hydroxide is a base, it's pH has to be above pH 7. Thus, option c is the correct option.
On the other hand, acids have a pH of lesser than 7 while pure water has a pH of 7. All the other options have a pH of less than 7, indicating that they are acids.
If you have a closed container that has a pressure of 2.35atm, and a volume of 1.2L, and contains 76.33g Cl2, what is the resulting temperature in K
The resulting temperature of a closed container that has a pressure of 2.35atm, and a volume of 1.2L, and contains 76.33g Cl2 is 31.8K.
How to calculate temperature?The temperature of a given gas can be calculated by using the ideal gas law equation:
PV = nRT
Where;
P = pressure V = volume n = number of molesR = gas law constantT = temperatureno of moles of Cl2 = 76.33g ÷ 70.91g/mol = 1.08mol
2.35 × 1.2 = 1.08 × 0.0821 × T
2.82 = 0.088T
T = 2.82/0.088
T = 31.8K
Therefore, the resulting temperature of a closed container that has a pressure of 2.35atm, and a volume of 1.2L, and contains 76.33g Cl2 is 31.8K.
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QUESTION 4 An aqueous solution of 4 mol/L nitric acid is electrolyzed in an electrolytic cell using graphite electrodes.
a) Write the chemical symbols for all the ions present in the electrolytic cell. (1 mark]
b) Name the gas given off at the cathode. [1 mark]
c) Name the gas given off at the anode. [1 mark]
d) Write the half reaction equations at the;
i) Cathode : [1 mark)
ii) Anode : [1 mark]
e) The overall anode - cathode reaction equation taking place in the electrolytic cell. [1 mark]
The gas given off at the cathode is hydrogen while the gas given off at the anode is oxygen.
What is electrolysis?The term electrolysis has to do with the decomposition of a substance by the passage of direct current through it.
The ions present in the system are H^+, OH^- and NO3^- ions. The gas given off at the cathode is hydrogen while the gas given off at the anode is oxygen.
The half reaction equation of the reduction is;
2H^+(aq) + e ----->H2(g)
The oxidation half reaction equation is;
4OH^- (aq)------> 2H2O(l) + 4e
The overall equation is;
4H^+(aq) + 4OH^- (aq)------> 4H2(g) + 2H2O(l) + 4e
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I rounded the answer but can you help me?
Sodium combines with water to produce sodium hydroxide and hydrogen gas. which word equation represents this violent reaction? sodium hydroxide water right arrow. sodium hydrogen sodium water right arrow. sodium hydroxide hydrogen sodium hydrogen right arrow. sodium hydroxide water sodium sodium hydroxide right arrow. water hydrogen
Answer:
B.) sodium water right arrow. sodium hydroxide hydrogen
Explanation:
Reactants are listed before the arrow and products are listed after the arrow. This symbolizes the reactants turning into the products.
Reactants --> Products
Reactants are the molecules which react with each other to make new molecules. Since sodium and water are being combined, they are the starting molecules. Products are the molecules made after a reaction occurs. Sodium hydroxide and hydrogen gas are produced, making them the ending molecules. The balanced chemical equation is:
2 Na⁺ (s) + 2 H₂O (l) --> 2 NaOH (s) + H₂ (g)
Jin listed some common thermal insulators and conductors in a chart. (attached below)
Which belongs in the area marked with an X?
A.) Iron
B.) Foam
C.) Wood
D.) Glass
Have a great rest of your day
#TheWizzer
Answer:
I would have to say the answer is A) iron. I say this because Iron is one of the most well know conductors and in the chart it as rubber and copper as the two conductors whole Air and Iron should be the x. Plus the rest don't make good conductors they are more insulators. So logicaly it wouldn't make sense to have any of the other answers.
Explanation:
Hope This Helps
Have A Great Day
~Zero~
According to the concept of conduction, iron belongs in the area marked with an X.
What is conduction?Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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Which of the following could be a compound?
A
two atoms of oxygen bonded together
B
individual atoms of argon
C
hydrogen bonded to oxygen
D
a mixture of oxygen and nitrogen gases
Answer:
b. Individual atoms of argon
Explanation:
Hope this helps!
-Justin
The percentage of water vapor present in the air compared to that required for saturation is the ____.
Answer:
30%
Explanation:
The relative humidity is the water-vapor content of the air relative to its content at saturation. Saturated air, for example, has a relative humidity of 100 percent, and near the Earth, the relative humidity very rarely falls below 30 percent.
What is the mass of one mole of silver?
Answer:107.868 grams
Explanation: I’m really sorry if it’s wrong:-(
Answer:
107.8682 grams
Explanation:
The molar mass of a substance is the mass in grams of one mole of that substance. This mass is given by the atomic weight of the chemical unit that makes up that substance in atomic mass units (amu). For example, silver has an atomic weight of 107.8682 amu, so one mole of silver has a mass of 107.8682 grams
I Need help with this worksheet I Need the Work Please Thank you
1. a. 3
b. 2
2. a. 4
b. 6
3. a. 1
b. 2
4. a. 5
HELP ANYONE PLEASE ASAP TYY!!!
Select the element with the greatest metallic character.Select the element with the greatest metallic character.
The most metallic element must have the most negative reduction potental therefore, the most metallic element here is calcium.
What is a metal?A metal belongs to the groups that appear at the left hand corner o the periodic table. These elements are often sonorous when struck and possess a characteristic lustre.
We must know that the most metallic element must have the most negative reduction potental. Hence, the most metallic element here is calcium.
Missing parts: Select the element with the greatest metallic character. Li, Al, Cs, Ca
Learn more about metals: https://brainly.com/question/16759172
help help help help help
Answer:
It's C.
Explanation:
According to the site, "http://needtoknow.nas.edu/energy/energy-sources/renewable-sources/wind/" ... "Wind energy is an indirect form of solar energy created by a combination of factors, including the uneven heating of Earth’s atmosphere by solar radiation, variations in topography, and the rotation of Earth. People have been putting wind energy to use throughout history to propel sail boats, mill flour from grain, and pump water."
A solution was made using NaOH, the pH of the solution was found to be 11.452. What is the concentration of the hydroxide ion, OH^- in this solution
Answer:
i think it is 0.002831392
Explanation:
pOH = 14 - 11.452 = 2.548
pOH = -log(OH)
2.548 = -log(OH)
10^(-2548) = 0.002831392
The attraction forces between mercury atoms in liquid mercury are stronger than the intermolecular forces between water molecules. which of the following is most likely true about mercury? it has a higher surface tension than does water. it exhibits greater capillary action than does water. it is very soluble in water.
The attraction forces between mercury atoms in liquid mercury are stronger than the intermolecular forces between water molecules because it has a higher surface tension than does water.
What is surface tension?Surface tension is the propoerty of the surface of liquids by which they will shrink into the minimum possible surface area.
Surface tension of the liquid mercury is greater than the surface tension of water means cohesive attraction force between the molecules of mercury is greater than water molecules.
Hence option (A) is correct.
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Answer:
It has a higher surface tension than does water.
Explanation:
got it right on edge on 12-15-22
A 240.0 gram piece of copper is dropped into 400.0 grams of water at 24.0 °C. If the final temperature of water is 42.0 °C, what was the initial temperature of the copper piece? (5 points)
Specific heat of copper = 0.39 J/g °C
Group of answer choices
322 °C
345 °C
356 °C
364 °C
The initial temperature of the copper piece if a 240.0 gram piece of copper is dropped into 400.0 grams of water at 24.0 °C is 345.5°C
How to calculate temperature?The initial temperature of the copper metal can be calculated using the following formula on calorimetry:
Q = mc∆T
mc∆T (water) = - mc∆T (metal)
Where;
m = massc = specific heat capacity∆T = change in temperatureAccording to this question, a 240.0 gram piece of copper is dropped into 400.0 grams of water at 24.0 °C. If the final temperature of water is 42.0 °C, the initial temperature of the copper is as follows:
400 × 4.18 × (42°C - 24°C) = 240 × 0.39 × (T - 24°C)
30,096 = 93.6T - 2246.4
93.6T = 32342.4
T = 345.5°C
Therefore, the initial temperature of the copper piece if a 240.0 gram piece of copper is dropped into 400.0 grams of water at 24.0 °C is 345.5°C.
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Answer:
the correct answer is 364
q = m * c * ΔT
where q is the heat absorbed or released, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
We can assume that the heat lost by the copper is gained by the water, so:
q(copper) = -q(water)
where the negative sign indicates that the copper loses heat while the water gains heat.
The specific heat capacity of copper is 0.39 J/g °C, so:
q(copper) = 240.0 g * 0.39 J/g °C * (T(copper) - 24.0 °C)
The specific heat capacity of water is 4.18 J/g °C, so:
q(water) = 400.0 g * 4.18 J/g °C * (42.0 °C - T(copper))
Setting q(copper) equal to -q(water), we get:
240.0 g * 0.39 J/g °C * (T(copper) - 24.0 °C) = -400.0 g * 4.18 J/g °C * (T(copper) - 42.0 °C)
Simplifying and solving for T(copper), we get:
T(copper) = [(400.0 g * 4.18 J/g °C * 42.0 °C) + (240.0 g * 0.39 J/g °C * 24.0 °C)] / (240.0 g * 0.39 J/g °C + 400.0 g * 4.18 J/g °C)
T(copper) = 364.1 °C
Therefore, the initial temperature of the copper piece was 364.1 °C.
Hence, the answer is "364 °C".
Which functional group is used in other functional groups?
Explanation:
a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions
help please giving brainliest!
Answer:
a reaction that can occur in both forward and reverse directions at the same time.
Explanation:
This is because ↓
A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously. A and B can react to form C and D or, in the reverse reaction, C and D can react to form A and B.
Hope this helps =)
Anyone know this? Cuz I don’t this one is
Answer:
its legislative.
Given the following equation: NaOH + HCl -> NaCl + H2O. Calculate the mass of water produced when 80.0 g of NaOH react with excess HCl.
Answer:
36 grams
Explanation:
Na 22.989
O 15.999
H 1.008 total 39.996 gm per mole
80 grams is 80 / 39.996 = ~ 2 moles
From the equation each mole of NaOH used results in ONE mole of H2O
so you will get two moles of H20
(1.008 *2 + 15.999) * 2 = ~ 36 gm
What is the molarity of a solution consisting of 105 grams of calcium nitrate and 280. grams of water?
Answer:
About 2.29 M.
Explanation:
Recall that molarity is defined by moles of solute over liters of solution.
Our solute is 105 grams of calcium nitrate (Ca(NO₃)₂)).
Convert 105 grams of Ca(NO₃)₂ to moles. The molecular weight of Ca(NO₃)₂ is 164.10 g/mol:
[tex]\displaystyle 105\text{ g Ca(NO$_3$)$_2$}\cdot \frac{1\text{ mol Ca(NO$_3$)$_2$}}{164.10\text{ g Ca(NO$_3$)$_2$}} = 0.640\text{ mol Ca(NO$_3$)$_2$}}[/tex]
Convert 280. grams of water to liters. Recall that the density of water is given by 1.00 g/mL:
[tex]\displaystyle \begin{aligned} D & = \frac{m}{V} \\ \\ V & = \frac{m}{D} \\ \\ & = \frac{(280.\text{ g})}{\left(\dfrac{1.00\text{ g}}{1\text{ mL}}\right)} \\ \\ & = 280. \text{ mL}\cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.280\text{ L soln.}\end{aligned}[/tex]
Hence, the molarity of the solution is:
[tex]\displaystyle \begin{aligned} \text{M} &= \frac{\text{ mols solute}}{\text{L soln.}} \\ \\ & = \frac{(0.640\text{ mol})}{(0.280\text{ L soln.})} \\ \\ & = 2.29\text{ M} \end{aligned}[/tex]
In conclusion, the solution is about 2.29 M.
Which is a warning sign that someone needs the help of a mental health professional?
A.
feeling shy when asked to walk onstage
B.
overeating to increase bodily strength
C.
inablity to sleep properly for weeks
Answer:
The answer is C. Inability to sleep properly for weeks.
Explanation:
This means that your mental health is going downhill because the lasck of sleep can drive you insane.
Hope This Helps!
-Justin:)
complete and balance the following equation b. na2 co3
the question isnt clear where are the products ir the reactants like __ = ___ + ___
Write a chemical equation for the acid/base reaction that produces the salt potassium sulfate?
Answer:
KOH + H2SO4 --> K2SO4 + H2O
How many moles of Ca(NO3)2 are there in 77.4 mL of 0.45 M solution?
Round your answer to 3 decimal spaces, even if sig figs are not conserved.
(Please answer quickly)
Answer:
.03483 moles
Explanation:
.45 * 77.4/1000 =
At body temperature, 2404 J is required to evaporate 1 g of water. After vigorous exercise, a person feels chilly because the body is giving up heat to evaporate perspiration. A typical person perspires 25 mL of water after 20 minutes of exercise. How much body heat is used to evaporate this water
Answer: - 1.45 kJ
Explanation:
Using q = m x C x (ΔT)
Given : m = 3.8 g , C = 0.900 J/g°C, = -(450-25)°C = -425°C (Since final temperature is less than the initial, the sign is negative)
q = (3.8 g) x (0.900 J/goC) x ( -425 °C)
= -1453.5 J
= -1.45 kJ
Note that negative sign of q indicates that this much heat is released, when the metal cools down.
A gas has a volume of 22. 6L at 3. 6 atm. What is the pressure of the gas at 44. 3L
Answer:
1.837 atm
Explanation:
According to Boyle's Law:
[tex]V_{1} P_{1} = V_{2}P_{2}[/tex]
(22.6L) (3.6atm) = (44.3L) (x)
x = 81.36 /44.3
x = 1.837 atm
This is because Volume and Pressure are inversely proportional. If one increases the other has to decrease.
Consider the following oxidation-reduction reaction: 2fe3+(aq) + 2hg(l) + 2cl−(aq) → 2fe2+(aq) + hg2cl2(s). indicate the oxidizing agent and the reducing agent.
Answer:
The reducing agent is Hg (mercury) and the oxidixing agent is Cl (chlorine)
Explanation:
first find the oxidation charges of each of the different ions. All elements that are alone have a charge of 0. As you compare the reactants and products we can see that the chargers of Hg and Cl have changed.
Hg went from a charge of 0 to a charge of +1
Cl went from a charge of 0 to a charge of -1
remember when a substance gains electrons it is reducing and when a substance is losing electrons it is oxidizing.
use the acryonm
OIL
Oxidizing Is Losing
RIG
Reducing Is Gaining