Answer:
''hydroxide ions make sodium hydroxide solution alkaline'' is true.
Explanation:
In the first sentence, OH+ ions is incorrect. It has to be OH- ions.
In the last sentence, hydride ions(H-ions) is incorrect. It has to be hydrogen ions(H+ ions).
what is similar about the comparison of pluto and ceres?
Answer:Difference between Ceres and Pluto
Nestled in the asteroid belt between Mars and Jupiter, Ceres is a tiny loner, while Pluto — in the Kuiper Belt at the edge of the solar system — is nearly three times as big and hosts a handful of moons. A mixture of rock and water ice dominates Ceres' landscape, while methane and nitrogen ices cover Pluto
Explanation:
Did the evidence produced by Thomson's investigations with the cathode ray tube
support Dalton's atomic theory?
Answer:
maybe maybe maybe maybe
Water conservation is important for which of the following reasons?
A. Demand for water is increasing.
B. Water treatment is expensive.
C. Pollution is likely to decrease water supply in the future.
D. All of the above
D
all of above becuase it's all conservation
Answer:
The answer is c which is pollution is likely to decrease water supply in the future
Mechanism of aspirin by salicyclic acid reacts with acetic acid ? Mechanism of benzoic acid from benzamide?
Answer:
See explanation
Explanation:
The synthesis of aspirin is shown in the reaction scheme attached to this answer. The production of aspirin involves the reaction of acetyl salicyclic acid and acetic anhydride. HA in the reaction mechanism refers to an acid that is used in the reaction
Similarly benzamide, is converted to the carbonyl carbocation by reaction with acid. The -NH2 group is protonated and subsequently departs as a leaving group. An OH^- completes the mechanism forming a carboxylic acid. The movement of electrons is shown in the image attached.
Again, the diazotization of benzamide using sodium nitrate and concentrated HCl yields benzene diazonium chloride. Addition of water to benzene diazonium chloride yields the benzoic acid and nitrogen gas.
write an ionic half equation for the formation of hydrogen during this electrolysis
Answer:
A half-equation shows you what happens at one of the electrodes during electrolysis. Electrons are shown as e-. A half-equation is balanced by adding, or taking away, a number of electrons equal to the total number of charges on the ions in the equation.
When positive metal ions (cations) arrive at the negative electrode (the cathode), they gain electrons to form neutral metal atoms. This is called reduction. For example:
Pb2+ + 2e- → Pb
When negative non-metal ions (anions) arrive at the positive electrode (the anode), they lose electrons to form neutral atoms or molecules. This is called oxidation. For example:
2Br- → Br2 + 2e-
Writing half equations
Cations go to the cathode. They need to gain enough electrons to make them neutral. So an Al3+ ion needs to gain three electrons:
Al3+ + 3e- → Al
Half-equations for non-metal anions are more difficult to balance. For example, chloride ions make chlorine gas. Most non-metal elements formed in electrolysis are diatomic molecules (eg Cl2). For example:
Cl- → Cl2
Add in two electrons to balance the charge so that both sides have the same charge. The two electrons need to go on the right-hand side, so that both sides have an overall charge of -2. For example:
2Cl- → Cl2 + 2e-
Although your question lacks some information a general answer is provided
The ionic half equation = [tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
The formation of hydrogen takes place at the negative electrode in a cell and the ionic half reaction that shows the formation of the hydrogen gas at the electrode is written as :
[tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
Ionic half equation is the representation of the chemical activity ( reaction ) occurring at one of the electrodes of a cell. to balance a half reaction we add or remove electrons equal to charges on the ions.
Hence the Ionic half equation for the formation of hydrogen during electrolysis is written as ; [tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
learn more : https://brainly.com/question/4046381
Ionic/Covalent=NaBr
Answer:
NaBr is ionic.........
Answer:
NaBr is ionic
(in the image is lewis structure and simplified)
Hope it helps you ✨
If you divided one regtangle into ten smaller regtangles and then each of those into ten each of the smallest regtangles is?
Answer:
0.01.
Explanation:
This is because, if you divided one rectangle by ten, it will give 0.1
That is 1/10 = 0.1
If each of the smaller rectangles is divided by 10.
It will be 0.1/10 which will be equal to 0.01.
The rectangles will be 0.01 each.
A closed gas system initially has volume and pressure of 6400mL and 1.49atm with the temperature unknown. If the same closed system has values of 657 torrs, 9660mL, and 2450C, what was the initial temperature in K?
Answer: The initial temperature was 588 Kelvin
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 1.49 atm
[tex]P_2[/tex] = final pressure of gas = 657 torr = 0.864 atm (760 torr = 1atm)
[tex]V_1[/tex] = initial volume of gas = 6400 ml
[tex]V_2[/tex] = final volume of gas = 9660 ml
[tex]T_1[/tex] = initial temperature of gas = ?
[tex]T_2[/tex] = final temperature of gas = [tex]245^0C=(245+273)K=515K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{1.49\times 6400}{T_1}=\frac{0.864\times 9660}{515}[/tex]
[tex]T_1=588K[/tex]
The initial temperature was 588 Kelvin
disadvantage of globalization:
plz leave some ideas
Answer:
causes job displacement
A mole of oxygen and a mole of hydrogen (at STP) have all of the following in common EXCEPT
Answer:
Root mean squared velocity is different.
Explanation:
Hello!
In this case, since we have a mixture of oxygen and nitrogen at STP, which is defined as a condition whereas T = 298 K and P = 1 atm, we can infer that these gases have the same temperature, pressure, volume and moles but a different root mean squared velocity according to the following formula:
[tex]v_{rms}=\sqrt{\frac{3RT}{MM} }[/tex]
Since they both have a different molar mass (MM), nitrogen (28.02 g/mol) and oxygen (32.02 g/mol), thus we infer that nitrogen would have a higher root mean squared velocity as its molar mass is less than that of oxygen.
Best regards!
A mole of oxygen and a mole of hydrogen (at STP) don't have common root mean square velocity.
What is root mean square velocity?Root mean square velocity of any gas is calculated as:
Vr = √3RT / M, where
R = universal gas constant
T = temperature,
M = molar mass
As in the question it is given that amount of gases are taken in standard condition i.e. 273 K temperature and 1 atm pressure, but mass of hydrogen and oxygen is different. So the resultant root mean square velocity of hydrogen and oxygen gas is different.
Hence, root mean square velocity of hydrogen and oxygen gas is different at STP.
To know more about root mean square velocity, visit the below link:
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Science question: Which beat summarized the scientific process that led to our current understanding of DNA?
1 each scientist made an important but unrelated contribution
2. Scientists built on the previous work of other scientists to make new discoveries
3 and 4 are too long
Answer:
2
Explanation:
in terms of cells, it exists from previous existing cells, that means scientist are built up by the work of other scientist
Answer:
the answer is B
Explanation:
1. Which of the five types of reactions is taking place in the whoosh bottle? Justify your answer with evidence from the video.
Answer:
Other times I place a candle in water and cover it with a glass jar .
Explanation:
only to ... Many of you may already know this as the Whoosh Bottle demo due ... I have used this demo in the past for topics like exothermic reactions, combustion reactions, ... This adds to the evidence of a partial vacuum created in the bottle
In a few sentences describe what this weather map tells you about the weather pls answer this it’s due at 10 pm tonight
Answer:
I dont know im very sorry
A sample of hydrogen gas has an initial temperature of 50° C. When the temperature is lowered to -5° C, the volume of hydrogen becomes 212 cm^3. What was the initial volume of the hydrogen in cm^3 when the pressure is kept constant?
Answer:
255.51 cm³
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T₁) = 50° C
Final temperature (T₂) = –5° C
Final volume (V₂) = 212 cm³
Initial volume (V₁) =?
Next, we shall convert celsius temperature to Kelvin. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 50° C
Initial temperature (T₁) = 50° C + 273
Initial temperature (T₁) = 323 K
Final temperature (T₂) = –5° C
Final temperature (T₂) = –5° C + 273
Final temperature (T₂) = 268 K
Finally, we shall determine the initial volume of the hydrogen gas. This can be obtained as follow:
Initial temperature (T₁) = 323 K
Final temperature (T₂) = 268 K
Final volume (V₂) = 212 cm³
Initial volume (V₁) =?
V₁/T₁ = V₂/T₂
V₁ / 323 = 212 / 268
Cross multiply
V₁ × 268 = 323 × 212
V₁ × 268 = 68476
Divide both side by 268
V₁ = 68476 / 268
V₁= 255.51 cm³
Therefore, the initial volume of the hydrogen gas 255.51 cm³
What challenges or opposition did Galileo face in having his theories accepted and why
Answer:
Poorness is the one because he needs large money for his inventions and tools to use in them. He also have problems in securing patent protection and dealing with publishing pressure.
But the greatest problems is the opposition of his discoveries by the Catholic Church, they banned his books, they abstain him from teaching inventing, and writing. But as we know, a hero stands even on the hardest times
Explanation:
The challenges or opposition to Galileo Galilei, an astronomer, and mathematician, struggled with issues that contemporary scientists would recognize, such as obtaining funding, acquiring patent protection, and coping with the urge to publish.
Who was Galileo?Galileo was an astronomer and scientist. He was from Italy. He is a famous scientist and did many discoveries in the field of astronomy. The main discoveries were craters and mountains on the moon and the stars of the galaxy.
He was criticized for believing in the kinetic hypothesis, and he denied astronomical authority. The challenges he faced were patent problems and funding problems.
Thus, Galileo was criticized for defending the kinetic hypothesis and denying the astronomical authority of Scripture.
To learn more about Galileo, refer to the link:
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#SPJ2
Carbon and oxygen combine to produce carbon dioxide. chemical equation
Answer:
A molecule of the compound carbon dioxide consists of one atom of carbon and two atoms of oxygen, so carbon dioxide is represented by the chemical formula CO2. Q: What is the chemical equation for this reaction? A: The chemical equation is: C + O2 → CO.
Explanation:
Which of the following is the chemical formula for an acid?
- NHO3 (aq)
- NaOH (aq)
- NH3 (g)
- HCl (g)
- SCl2 (g)
Why?
Answer:
NH3 and HCl
Explanation:
NH3 and HCl are acids because of their hydrogen ions. NHO3 and NaOH are bases (you can tell because they have an OH). I don't believe SCl2 is an acid or a base
11.
Which of these statements is true about the two graphed parallelograms?
A
B
8
6
A
4
B'
D
C
2
D
C'
-6
2
4
6
-2.
-2
-4
-6
-8 +
A
They are similar, because one can be obtained by dilating the other about the origin with a scale factor of
Answer:
Explanation:
dfghyuiop[]5565677dam u baddie no comparing
what two things work together making your body move.
Answer:
Muscular System and the Skeletal System
Explanation:
The skeletal and muscular system work together but assisting each other for movement and support.
The freezing point of pure water is 0 °C (32 °F). How do you think adding salt to water affects its freezing point?
What are ancient plants and animal formed into rocks called it is a 7 letter word that starts with f
Answer:
Fossils
Explanation:
Ancient plants and animal formed into rocks called fossils.
A fossil can be defined as the mineral impression or remains of living organisms such as plants and animals that are prehistoric in nature.
A geologic column can be defined as a collection of rock layers that are typically grouped based on their relative ages in a descending order i.e from oldest to the youngest.
Generally, the layers of the rock that are found in various parts of the world are known to be different because they all comprises of distinct Earth's geological history (fossils).
When a 8 gram slice of bread is burned under a beaker of 4500 grams of water, it heats up the water by 1.3 degrees Celsius. The specific heat of water is 1 cal/g degree C. How many calories does this slice of bread contain
Answer:
[tex]5850\ \text{cal}[/tex]
Explanation:
m = Mass of water = 4500 g
c = Specific heat of water = [tex]1\ \text{cal/g}^{\circ}\text{C}[/tex]
[tex]\Delta T[/tex] = Change in temperature of water = [tex]1.3^{\circ}\text{C}[/tex]
Heat is given by
[tex]q=mc\Delta T\\\Rightarrow q=4500\times 1\times 1.3\\\Rightarrow q=5850\ \text{cal}[/tex]
A slice of the bread contains [tex]5850\ \text{cal}[/tex].
How does the concentration of reactants affect the rate
of Chemical reaction? explain in short
Answer:
The increase in the concentration of reactants increases the frequency of effective collisions.
Explanation:
The concentration of reactants determines the rate of reaction by providing the number of reactants available to yield an effective collision. There is a direct relationship between the concentration of reactants and rate of reaction.
What is the independent
variable in this lab?
temperature
distance
thermal conductivity
time
specific heat
Answer:
time
Explanation:
time can be controlled and set while all the others can't be necessarily controlled
Earth
Moon
SUN
Based on the diagram above, what moon phase would most likely be occurring?
Number 2 plsssssssssssss
write the electronic configuration of an Na+ and CL-1
Answer:
Na+ lost one electron: 1s2 2s2 2p6
Cl- gained an electron: 1s2 2s2 2p6 3s2 3p6
Explanation:
40 points
I have 400 mL of a 0.2 M simple syrup solution (made up of just sugar and water) that I want to boil down to result in a solution with a concentration of 0.5 M. How many milliliters of water would I need to evaporate?
Answer:
2000ml
Explanation:
you multiple 400ml with 0.5 ml to get the required meter for the water that needs to be evaporated
(I ONLY HAVE 15 MIN LEFT IN MY TEST PLEASE HELP ME!!)
If 107 g of a substance reacts with 76 g of another substance, what will be the mass of the products after the reaction
Answer:
183g
Explanation:
mass can't be created or destroyed so i think you just add up the total amounts of matter
A sample of a pure element has a mass of 45.6g and contains 4.19 x 10 23 atoms. Identify the element.
ZINC
Explanation:To identify the element based on the informartion given, we have to find the molar mass since this mass is unique to each element.
Molar mass = mass ÷ moles
We already know the mass based on the question, as such we now need to find the # of moles.
Since 1 mole contains 6.02214 × 10²³ atoms
then let x moles contain 4.19 × 10²³ atoms (given in the question)
⇒ x = (4.19 × 10²³ atoms × 1 mol) ÷ 6.02214 × 10²³ atoms
x = 0.69577 mol
Now that we have the moles we can substitute it into the molar mass equation and solve for the molar mass.
⇒ molar mass = 45.6 g ÷ 0.69577 mol
⇒ molar mass ≈ 65.54 g/mol
This molar mass is closest to that of ZINC.