Answer:
Potassium bromide
Explanation:
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.
Write a chemical equation for the acid/base reaction that produces the salt potassium sulfate?
Answer:
KOH + H2SO4 --> K2SO4 + H2O
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
polease help 20pts
chemistry redox
Answer:
A is mg because it is losing 2 electrons
B is N2
C Mg as oxidation is lose of electrons
D is N2 as reduction is gain of electrons
Explanation:
you can easily remember as OIL RIG in term of electrons as Oxidation is Lost of electrons. Reduction is Gain of electrons.
Why is innate immunity referred to as nonspecific?
because it provides a built-in mechanism of defense that does not require "training"
because it is a form of defense found in all animal species
because it is a form of defense that functions in all human body systems
because it provides defense against a wide range of pathogens
Answer:
c
Explanation:
The innate immune system is the body's first line of defense against germs entering the body. It responds in the same way to all germs and foreign substances, which is why it is sometimes referred to as the "nonspecific" immune system
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
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
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.
I rounded the answer but can you help me?
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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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
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
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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".
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 =
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:)
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
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
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.
What is a trade-off?
Don't mind the highlighted yellow circle
Answer:
a new scientific discovery that benefits the environment
The question is given in the image below
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."
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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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.
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.
What is the molarity of NaCl when 5.0 moles of NaCl is dissolved in 2.0 L solution
Answer:
Molarity having mol/L that is moles of solute in per liters of solution.
mark as Brainliest please
Explanation:
substituted and expected value in the above education molarity equal to 0.5 mole by 2.0
The state of matter represented on the right (letter D) has the
highest energy. Of the four choices shown, which is plasma?
B. B.
A. A
D. D
С. С
Answer:
A is the answer.
Explanation:
gorgeousness
Elaborate on the method used to extinguish each class of fire
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)
Ferrous ammonium sulfate is what kind of test method.
A FAS-DPD titration is as simple as a test for total alkalinity or calcium hardness. A buffered DPD indicator powder is added to a water sample and reacts with chlorine to produce the pink color characteristic of the standard DPD test.
In which method ferric ammonium sulphate is used as an indicator?
Chemical analysis is the name of the method when ferric ammonium sulphate is used as the indicator. Basically, this method is used in the making of pharma elements. It is used in standardizing the formulation.
What is a DPD test?
The DPD test is used extensively in water treatment to determine the level of disinfectant present. In most cases, this is Free Chlorine but it can be used to measure other parameters ( oxidants ). It is a quick and relatively easy test which requires little background or skill to perform.
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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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