Answer:
It’s A
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions. According to Dalton, the atoms of same element are similar in all respects.
11. A cart is loaded with a brick and pulled at constant speed along an inclined plane to the height of a seat-top. If the
mass of the loaded cart is 3,500g and the height of the seat top is 0.45 meters, then what is the potential energy of the
loaded cart at the height of the seat-top?
Answer:
15.75 J
Explanation:
Potential energy
= mgh
= 3,500 g × 10 m/s² × 0.45 meters
= 3.5 kg × 4.5 m²/s²
= 15.75 J
A solution made from pure Potassium hydroxide contained 1.85 g of Potassium hydroxide in exactly 200 cm3 of water. Using phenolphthalein indicator, titration of 20.0 cm3 of this solution is carried out v/s sulphuric acid. 9.35 cm3 of sulphuric acid solution is required for complete neutralisation. [atomic masses: K= 39, O = 16, H = 1]
(a) write the equation for the titration reaction.
(b) calculate the molarity of the Potassium hydroxide solution. (c) calculate the moles of Potassium hydroxide neutralised. (d) calculate the moles of sulphuric acid neutralised.
(e) calculate the molarity of the sulphuric acid.
The concentration of H2SO4 is 0.176 M. The number of moles of H2SO4 is 0.0165 moles.
The equation of the reaction is;
2KOH(aq) + H2SO4(aq) ------> K2SO4(aq) + H2O(l)
The number of moles of KOH = 1.85 g/56 g/mol = 0.033 moles
concentration = number of moles /volume
volume = 200 cm3 or 0.2 L
concentration of KOH = 0.033 moles/0.2 L = 0.165 M
From the titration formula;
CAVA/CBVB =na/nb
CA = concentration of acid
VA = volume of acid
CB = concentration of base
VB = volume of base
na = number of moles of acid
nb = number of moles of base
Making CA the subject of formula;
CA = CBVBna/VAnb
CA = ?
CB = 0.165 M
VA = 9.35 cm3
VB = 20.0 cm3
na = 1
nb =2
CA = CBVBna/VAnb
CA = 0.165 M × 20.0 cm3 × 1/9.35 cm3 × 2
CA = 0.176 M
The concentration of sulphuric acid is 0.176 M
From the reaction equation;
2 moles of KOH reacts with 1 mole of H2SO4
0.033 moles of KOH reacts with 0.033 moles × 1 mole/2 moles
= 0.0165 moles of H2SO4
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which of the following terms completes the sentence below? to fill out a sign chart, you will need to use test numbers before and after each of the functions zeros and ___? A asympototes B expressions C proportions D values
The (15-35-15) number on a bag of fertilizer is calculated by an outdated method. All modern fertilizers use PO43- as a source of phosphorus. Use your knowledge of the old methods to determine the moles of phosphorus found in 10.0 grams of (15-35-15)?
The (15-35-15) number on a bag of fertilizer is calculated by an outdated method. Using the knowledge of the old methods, the number of moles of phosphorus found in 10.0 grams of phosphorus is 0.05 mole.
The (15-35-15) number on the bag of fertilizer is used for:
Nitrogen 15 : Phosphorus pentoxide 35: potassium oxide 15Thus, in a 100-gram bag of fertilizer, there are 35 grams of phosphorus pentoxide P₂O₅.
∴
To determine the number of moles of 10 grams of phosphorus pentoxide in (15-35-15) bag of fertilizer, we have:
[tex]\mathbf{=10 \times \dfrac{35}{100} \ grams \ of \ P_2O_5}[/tex]
= 3.5 grams of P₂O₅
Recall that:
[tex]\mathbf{Number of moles = \dfrac{mass}{molar \ mass}}[/tex]
the molar mass of P₂O₅ = 142 g/mol∴
[tex]\mathbf{Number of moles = \dfrac{3.5\ g}{ 142 \ g/mol}}[/tex]
[tex]\mathbf{Number of moles = 0.0246 \ mol}[/tex]
Provided that 1 mole of P₂O₅ harbors 2 moles of phosphorus;
Then;
The number of phosphorus present in 10.0 grams of (15-35-15) fertilizer is:
= 0.0246 moles × 2
= 0.0492 moles
≅ 0.05 moles
Therefore, we can conclude that the number of moles of phosphorus found in 10.0 grams of (15-35-15) bag of fertilizer is 0.05 moles.
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37. A patient had pale tinger nail, shortness of breath and felt dizzy. The patient is most likely suffering from A. Kwashiorkor B. Marasmus C. Anaemia D. Rickets
Answer:
Anaemia
Explanation:
Symptoms: fatigue, skin pallor, shortness of breath, lightheadedness, dizziness, or a fast heartbeat.
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of NaCl were produced by 10 moles of NaClO3? Round your answer to the nearest whole number.
Answer:
10 moles of sodium chloride
Explanation:
[tex]\sf{}[/tex]
what is the common and IUPAC name for Oxygen?
Answer:
International Union of Pure and Applied Chemistry (IUPAC) justified ways how to name organic compounds [ hydrocarbons ].
Oxygen has only a molecular name which is dioxide
What ideas do you have about why these ions are so important for life?
Answer:
i dont get it
Explanation:
im small brain and only in 5th grade
Write the equation for the alpha decay of C-11.
Write the equation for the beta decay of Be-10
HELP HELP HELP
Answer:
We know that in the decay process the sum of molecular number as well as molecular weight should be constant.
The following three reaction are as follows
1 .
Explanation:
2 H2O(l) → 2 H2 (g) + O2 (g) ΔH°rxn = +572 kJ Determine the heat associated with the reaction (qrxn, in kJ) when 4.85 grams of H2(g) is produced.
The heat associated with the reaction (qrxn, in KJ) when 4.85 grams of H₂ is produced is +693.55 KJ
Balanced equation2H₂O → 2H₂ + O₂ ΔH°rxn = +572 KJ
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass of H₂ from the balanced equation = 2 × 2 = 4 g
SUMMARY
From the balanced equation above,
When 4 g of H₂ is produced, 572 KJ of heat where needed.
How to determine the heat requiredFrom the balanced equation above,
When 4 g of H₂ is produced, 572 KJ of heat where needed.
Therefore,
When 4.85 g of H₂ is produced = (4.85 × 572) / 4 = +693.55 KJ of heat will be required.
Thus, +693.55 KJ of heat is required for the reaction.
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An image of Earth's layer is above.
Which layer is the most dense?
layer A
layer B
layer C
layer D
Answer:
d
Explanation:
il answer in comments if you brainly me
What is the weakness of particle theory?
Answer:
The particle model does not take into account: the size and shape of particles. the space between particles.
The weakness of particle theory are:
matter is very small in size which are continuously moving. most of the particle are not spherical.particles are not solid because atoms are having empty space.What is particle theory?it is a part of kinetic theory which states that all matter consists of very small particles which are constantly moving or in a continual state of motion.
Therefore, lack of space between particles and size of particles are the limitations of particle theory.
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HELP!! please choose all the correct answers, picture attached
Covalent bonds take place between..
A. A metal and a nonmetal
B. A metal and a metalloid
C. Two nonmetals
D.two metals
please answer this question. No links please!!!
Answer:
Covalent Bonds are formed when two non-metals share electrons
Hope this helps
Describe the five layers of the earth by providing the following information for each layer:
Name of the layer
Composition
Average temperature
Average thickness
make simple! pls
Answer:
answers below
Explanation:
Lithosphere/ Crust- made of large plates that move, average thickness is 30 km, average temperature is 25 degrees Celsius
Inner Core- made of solid iron, 1,200 km thick, 7,000 degrees Celsius
Outer Core- made of a dense liquid of iron and sulfur, 2,250 km thick, 4,000 degrees Celsius
Lower Mantle- made of solid rock, 2,200 km thick, 3,000 degrees Celsius
Asthenosphere/ Upper Mantle- made up of solid rock that flows due to plasticity, 720 km thick, 850 degrees Celsius
Moon rocks resemble rocks from which of the following layers of the earth?
from the illustration of the potassium atom fill in the periodic table selection
Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
Please help me with the following question below:
Molarity as Stoikiometri
Level : SHSEquatuions od Molarity :
M = m/Mr × 1000/V
Mr Lithium Dichromate (Li2CrO4)
= Ar Li (2) + Ar Cr + Ar O (4)
= 7 (2) + 52 + 16 (4)
= 14 + 52 + 64
= 130 g/mol
Molarity
= m/Mr × 1000/V
= 19.5 g/130 g/mol × 1000/95 mL
= 0.15 mol × 10.53 /L
= 1.5795 mol/L
So, the molarity of the solution is 1.5795 mol/L
#LearnWithEXO
Which of these is a function of all cells ?
A. To produce oxygen through photosynthesis
B. To combine with other cells to form tissues
C. To subdivide to form cells for sexual reproduction
D. To transfer genetic information from one generation to the next
Answer:
a because it help in protecting disease
Which of the following is a non-reactive metal with 2 valence electrons?
O Magnesium
Chlorine
Carbon
Helium
Answer:
» a. MagnesiumExplanation:
• Magnesium is least reactive and • Magnesium has atomic number 12. Its electronic configuration is 2,8,2 . Thus, it has 2 valence electrons.Part A
Enter an equation for the precipitation reaction that occurs (if any) when solutions of ammonium chloride and calcium nitrate are mixed.
Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed.
ΑΣΦ
?
2NH, Cl(aq) + Ca(NO3)2 (aq) +CaCl, (s) + 2N, O(g) + 4H, O(g)
DA chemical reaction does not occur for this question
Submit
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The equation of reacting ammonium chloride with calcium nitrate will be: [tex]Ca(NO3)_2(s) + 2NH_4CI(s) --- > 2N_2O(g) + CaCl_2(s) + 4H_2O(g)[/tex]
What are chemical reactions?They are reactions involving chemical reactants.
Ammonium chloride, in solid form, will react with calcium nitrate, also in solid form to produce dinitrogen oxide gas, solid calcium chloride, and water vapor.
The equation of the reaction is represented as follows:
[tex]Ca(NO3)_2(s) + 2NH_4CI(s) --- > 2N_2O(g) + CaCl_2(s) + 4H_2O(g)[/tex]
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HELP PLS WILL NAME BRANLIEST BUT No LiNkS jUsT helP No LiNkS
Answer:
I think it's A and C. Please tell me if I am wrong.
Explanation:
Answer:
Alright so I did this quiz a while ago it's A and C now could i have brainliest?
Explanation:
Which equation best represents the conservation of matter?
please help me solve this
Answer:
dude your handwriting!!!
12) SEP Use Mathematics Complete the table by identifying the atomic number and
mass number for each atom and then using those data to determine the numbers
of protons, neutrons, and electrons.
Composition of Atoms
Atom
Atomic number
Mass number
Protons
Electrons
Neutrons
Na
2s
silver-108
47
T
gold-197
79
O
+ Back
Next →
INTL
The given elements are Na, Ag and Au.
1. Sodium(Na)
Mass number= 23 u
Atomic number=11
Number of protons= Number of electrons= Atomic number=11
Number of neutrons= Mass number- Number of protons=23-11=12
2. Silver (Ag)
Mass number= 108 u
Atomic number= 47
Number of protons= Number of electrons= Atomic number= 47
Number of neutrons= Mass number- Number of protons=108-47=61
3. Gold (Au)
Mass number= 197 u
Atomic number= 79
Number of protons= Number of electrons= Atomic number= 79
Number of neutrons= Mass number- Number of protons= 197-79=118
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Q13. Which of the following is a balanced chemical equation for the reaction between potassium carbonate soletion and hyelrochlori acid. 1
Answer:
Below
Explanation:
2HCl + K2CO3 -> 2KCl + CO2 + H2O
Which of the following resources can be obtained from the hydrosphere?
Which location in the diagram above is the Southern Hemisphere experiencing summer?
Location A
Location B
Location C
Location D
Answer:
location a
Explanation:
Answer:
Location B
Explanation:
Convection currents in the atmosphere influence many weather patterns. What property of the air has the most influence on convection currents?
1. The direction of the wind
2. The velocity of the wind
3. The temperature of the air
4. The mass of the air
Convection currents are largely influenced by air temperature. A low-pressure area is produced when air is heated because it becomes less dense and rises.
What effect on the climate does convection have?For instance, the air above the Earth heats and rises as its surface warms from the sun. This air may continue to rise while cooling and producing cumulus clouds if the conditions allow.
How do air masses respond to convection currents?Climate-affecting wind patterns are driven by convection currents. Convection currents are used to shift air masses. There are two different kinds of air masses: warm and cold. From higher latitudes to lower latitudes, cold air masses travel.
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how do i convert 9.5125 liters to gallons
Answer:
That would be 2.51293615
Explanation:
1 liter is equal to 0.264172 gallons.
What you would need to do is, multiply the total number of liters, which in this case is 9.5125, by 0.264172.
9.5125 x 0.264172 gets you 2.51293665.
I hope this helps! :)
