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Related Questions
What are the developing reactions that allow the identification of Ni2+ and Cu²+?
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Dimethylglyoxime is reacted with nickel ion solution. If it gives red precipitate then nickel ions are confirmed to be present.
Sodium hydroxide solution is been added to Copper Sulphate first in little and then in excess. A pale blue soluble precipitate is formed. This confirms presence of Cu²+.
CuSO4 + 2NaOH → Na2SO4 + Cu(OH)2
pls help me this is hard aaaaa
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The mass of the aluminum sample is 52 g.
Mass of the aluminum
The mass of the aluminum is determined by applying the principle of conservation of energy as shown below.
heat lost by aluminum = heat gained by water
m₁c₁Δθ₁ = m₂c₂Δθ₂
where;
m₁ is mass of aluminumm₂ is mass of waterc₁ is specific heat capacity of aluminumc₂ is specific heat capacity of water = 4.186 J/g⁰CΔθ₁ is change in temperature of aluminumΔθ₂ is change in temperature of waterm₁(0.897)(93.2 - 17.8) = (300)(4.186)(17.8 - 15)
m₁(0.897)(75.4) = (300)(4.186)(2.8)
67.634m₁ = 3516.24
m₁ = 3516.24/67.634
m₁ = 52 g
Thus, the mass of the aluminum sample is 52 g.
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What did the Bohr model assume about the motion of electrons?
A. All electrons move in a circular orbit around the nucleus.
B. Electrons do not have a specific path around the nucleus.
C. All electrons move in a single cloud layer around the nucleus.
D. Electrons always remain in the same location around a nucleus.
Answers
Answer:
A
Explanation:
Bohr proposed that an electron is found only in specific circular paths, or orbits, around the nucleus
Balance the following SYNTHESIS chemical reaction with the correct coefficients:
___Al (s) + ___S (s) --> ___Al2S3 (s)
a
1, 2, 3
b
2, 3, 1
c
1, 1, 2
d
3, 2, 1
Answers
Answer:
b 2,3,1
Explanation:
2 Al + 3 S ----> Al2S3
In the reaction __S+3O2->2SO3 what coefficient should be placed in front of the S
to balance the reaction?
1
2
3
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Answer:
i think 3
Explanation:
Answer:
Your answer Should be 2
Explanation:
because i need to flex my brain cells
helppppppppppppppppppppppppppppppppppppppppppppppppppp
Answers
Answer:
C hydrogen and orange boxes element
Explanation:
Do grasshoppers have wings
Answers
Answer: yes
Explanation: I feed grasshoppers to frogs
How many valence electrons does nitrogen atom have
Answers
Answer:
5 valence electrons
Explanation:
Answer:
5 electrons
Explanation:
Because atomic number of Nitrogen is 7 total 7 electrons are present 2 in first shell and 5 in valence shell
So these 5 electrons are known as valence electrons
When this event occurs and blankets animals with poisonous gasses it is called a ___________________ cloud.
Fill in the blank! :)
Answers
Answer:
pollution cloud. im not really sure but hope this helps
Explanation:
invenstigatory project potato battery research questions
Answers
Answer:
My hypothesis is that: If the electrolyte source is changed (potato, apple, lime, lemon), then the production of energy (measured in volts) using a lemon will produce the highest voltage because the acid content in the fruit or vegetable will produce electricity when in contact with the electrodes (both zinc and copper
Explanation:
Describe the preparation of
2.ool of o. 108M Bacl2 from
Bacl2.2HO (244.3 /mol)
Answers
Answer:
We have to weigh 52.8 g of BaCl₂·2H₂O, add it to a 2.00 L flask and add water until reaching the final volume.
Explanation:
Describe the preparation of 2.00 L of 0.108 M BaCl₂ from BaCl₂·2H₂O. (244.3 g/mol).
Step 1: Calculate the moles of BaCl₂
We need to prepare 2.00 L of a solution that contains 0.108 moles of BaCl₂ per liter of solution.
2.00 L × 0.108 mol/L = 0.216 mol
Step 2: Calculate the moles of BaCl₂·2H₂O that contain 0.216 moles of BaCl₂
The molar ratio of BaCl₂·2H₂O to BaCl₂ is 1:1. The moles of BaCl₂·2H₂O required are 1/1 × 0.216 mol = 0.216 mol.
Step 3: Calculate the mass corresponding to 0.216 mol of BaCl₂·2H₂O
The molar mass of BaCl₂·2H₂O is 244.3 g/mol.
0.216 mol × 244.3 g/mol = 52.8 g
We have to weigh 52.8 g of BaCl₂·2H₂O, add it to a 2.00 L flask and add water until reaching the final volume.
List the Basic Skill And Experiments
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Answer:
Observing. This is the most basic skill in science. ...
Communicating. It is important to be able to share our experiences. ...
Classifying. After making observations it is important to notice similarities, differences, and group objects according to a purpose. ...
Inferring. ...
Measuring. ...
Predicting.Explanation:
hope this he;lp
pick me a the brainliest
HELP HELP !!
All stimuli must be sent to ur brain for a response to occur
true or false?
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Why do we need to be curious?
in your own sentence
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Answer:
Well, there are a few reasons to be curious..
Being curious can: Keep your mind active instead of passive.
Keeps your mind observant on new ideas.
It also opens up new possibilities and keeps you creative.
You can have more excitement and mysteries in life!
Explanation:
Answer: I think you need to be curious because that is how we explore things. Many people find things interesting and if you don't inspect basically you will never learn to question right or wrong things.
Explanation:
anybody know this ?? If so help ASAP .
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Answer:
Mechanical Energy
Explanation:
Definition: Mechanical Energy The mechanical energy is
the sum of the kinetic and potential energies.
Fill in the blanks: Repeating an experiment several times and averaging the results helps to reduce ___ ___
Answers
Answer:
the amount of mistakes?
Explanation:
g The heat capacity of a bomb calorimeter is: a negative quantity with units of kJ/mol a negative quantity with units of J/oC a positive quantity with units of kJ/mol a positive quantity with units of J/oC
Answers
Answer:
I believe it is a positive quantity such as water has 4.14 j/oC it is always positive it is the energy needed to raise the temperature by 1 degree celsius
Explanation:
the specific heat capacity of water is 1 cal/gc how much heat in calories is released when 25.7 of water is cooled from 85 to 49
Answers
Answer:
The amount of heat that is released is -925.2 cal
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body can receive or release without affecting its molecular structure, that is, it does not change the state (solid, liquid, gaseous). In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state.
The equation that allows to calculate heat exchanges is:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
c= 1 [tex]\frac{cal}{g*C}[/tex]m= 25.7 gΔT= Tfinal - Tinitial= 49 °C - 85 °C= -36 °CReplacing:
Q= 1 [tex]\frac{cal}{g*C}[/tex] *25.7 g* (-36 C)
Solving:
Q= -925.2 cal
The amount of heat that is released is -925.2 cal
if you react 28 grams of butene with excess hydrogen how many grams of butane would you expect to get
Answers
Answer:
The correct answer is 29 grams.
Explanation:
Based on the given question, the reaction will be,
CH3CH=CHCH3 + H2 ⇒ CH3CH2CH2CH3
The molecular weight of butene is 56 grams per mole, and the molecular weight of butane is 58 grams per mole.
Thus, it can be said that 56 grams of butene reacts with hydrogen gas and produces 58 grams of butane.
Therefore, 28 grams of butene when reacts with hydrogen gas to give,
= 58/56 * 28 = 29 grams of butane.
Hence, the mass of butane produced will be 29 grams.
The frequency of a radio wave was measured to be (3.1x10^8) Hz What is the energy of the radio wave in kilojoules (kJ)?
1 Hz = 1 s–1
h = 6.626 x 10-34 J.s
MAKE SURE YOU PAY ATTENTION TO THE UNIT OF ENERGY GIVEN
Answers
The frequency of a radio wave was measured to be ( 3.1 x [tex]10^8[/tex] ) Hz . The energy of the radio wave in kilojoules ( kJ ) is 20.5 x [tex]10^{-29}[/tex] kJ .
The radio waves are the types of the electromagnetic radiation .
Calculation ,
given frequency of radio wave ( v ) = 3.1 x [tex]10^8[/tex] Hz
plank's constant ( h ) = 6.626 x [tex]10^{-34}[/tex] J.s ( given )
Formula used : E = hv
where h = plank's constant
v = frequency of radio wave
Now putting the value of all in equation ( i ) we get ,
E = 6.626 x [tex]10^{-34}[/tex] × 3.1 x [tex]10^8[/tex]
E = 20.5 x [tex]10^{-29}[/tex] kJ
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explain how to convert the moles to litters and litters to moles
Answers
hot dog hot dog hot diggity dog we got ears its time for cheers so long for now ah mickey mouse........ hot dog hot dog hot diggity dog
Answers
Answer:
b
Explanation:
Answer:
hot dog
Explanation:
who was the modern astronomer who provided insight into inertia through careful experiments
Answers
The modern astronomer who provided insight into the physical phenomena of inertia through careful experiments was Galileo Galilei, who showed by empirical evidence the heliocentrism to left in the past the erroneous earthcentrism idea.
Who was Galileo Galilei?Galileo Galilei was one of the most important astronomers in history who showed through careful experimentation that the Earth orbit around the Sun, which is known as heliocentrism.
In conclusion, the modern astronomer who provided insight into the physical phenomena of inertia through careful experiments was Galileo Galilei, who showed by empirical evidence the heliocentrism to left in the past the erroneous earthcentrism idea.
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What process do you think occurred in stars and supernovae to produce the atoms that make up everything on Earth?
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Answer:
A big star collapsing creates a shock wave that can trigger fusion events in the star's outer shell, which is how I believe the process that took place in stars and supernovae to form the atoms that make up everything on Earth happened. Nucleosynthesis is the process by which these fusion processes produce new atomic nuclei. One of the primary sources of the universe's heavy elements is thought to be supernovae. It is possible to synthesize materials heavier than iron, such as uranium and gold, during a supernova because the star emits enormous amounts of energy and neutrons. All of these components are launched into space during the supernova explosion.
Which best describes how magnesium (Mg) and oxygen (O) bond?
a
They form an ionic bond by exchanging two electrons.
b
They form an ionic bond by exchanging three electrons.
c
They form a covalent bond by sharing one electron.
d
They form a covalent bond by sharing four electrons.
Answers
Answer:
a
They form an ionic bond by exchanging two electrons.
Explanation:
Magnesium loses two electrons and oxygen gains these electrons so ionic bond is formed
The statement that best describes how magnesium (Mg) and oxygen (O) bond is, "they form an ionic bond by exchanging two electrons." This is further explained below.
What is bonding?Generally, bonding is the process of firmly connecting items together using adhesive, heat, pressure, or chemical bonding.
In conclusion, When magnesium (Mg) and oxygen (O) bond, they form an ionic bond by exchanging two electrons
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How does a vase on a table overcome gravity? What would happen if you moved the vase off the table
Answers
Answer:
A vase on a table overcomes gravity because of the upwards force of the table against it, which is stronger than the force of gravity. If you were to move the vase off the table it would no longer have anything stopping gravity from breaking it.
Explanation:
(01.05 LC)
Which of the following is an example of a chemical change? (4 points)
Select one:
O
a.Boiling water
b.Burning paper
c. Dissolving sugar in water
d.Melting gold
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5.
The reaction 2AB 2A + B is first order with respect to AB.
The half-life of the reaction is 2 minutes.
0.100 mol of AB is dissolved in a solvent to form 100 cm of a reaction mixture.
What is the concentration of AB, in mol dm, after 6 minutes?
A. 0.0125
B. 0.0250
CU 0.125
D. 0.250
[1]
Your answer
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The concentration of AB, in mol/dm³, after 6 minutes : 0.125
Further explanationFor first-order reaction :
[tex]\tt [A]=[A]oe^{-kt}\rightarrow t1/2=\dfrac{ln~2}{k}[/tex]
The half-life of the reaction is 2 minutes⇒t1/2=2 minutes
The concentration of AB, in mol dm, after 6 minutes ⇒ t=6 minutes
The rate constant (k) :
[tex]\tt k=\dfrac{ln~2}{t1/2}=\dfrac{0.693}{2}=0.3465[/tex]
The concentration after 6 minutes :
[tex]\tt [A]o=0.1~mol/100~cm^3=1~~mol/dm^3\\\\(A]=1\times e^{-0.3465\times 6}\\\\(A]=0.125[/tex]
What is the mass of 1.52 mol of the element
chlorine (Cl)?
Answer in units of g. HELP!!!!!!
Answers
Answer:
53.96g
Explanation:
Given parameters:
Number of moles = 1.52mole
Unknown:
Mass of the given mole = ?
Solution:
The given element is chlorine;
Mass of chlorine = number of moles x molar mass
Molar mass of chlorine = 35.5g/mol
So;
Mass of chlorine = 1.52 x 35.5 = 53.96g
Does you have more momentun when you are running 3 km/hr or when you are walking 1 km/hr? Explain your answer
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formula for momentum = mass x velocity