Answer:
x contain 9 percent ofcalcium carbonaye
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Answer:
for number 2
Explanation:
Hydrogen. Hydrogen ignites in air. If hydrogen is present in a test tube, a lighted splint held near its mouth ignites with a squeaky pop.
I thought in the third shell there are 18 electrons, but why are they gaining only 2 electrons?? Pls tell me... I have exam tomorrow....
(Pls Help) The study of such concepts as motion, force,y energy, matter, heat, sound, light, and the components of atoms is:
- Physics
- Biology
- Earth Science
- Astronomy
Answer:
It is Physics
because these are all physical components and/or characteristics
-Biology is the study of life
-Earth science is the study of the biosphere we live in
-Astronomy is about space
Answer:
Physics
Explanation:
Physics is the study of motion and force...
Biology is the study of life
Earth Science is wind, water and uk...
Astronomy is about planets and stars
Case Study 1: What went good and what went bad in the lab scenario?
Jane was mixing two chemicals in a beaker. She thought she would be ok not to wear goggles. She noticed that a greenish-yellow gas was bubbling out of the liquids. She had been told to make all observations that she could, so she held the beaker close to her nose and took a good whiff.
Answer:
Nothing went well.
Explanation:
Everything went badly.
Jennifer took off her goggles. The mixture was already bubbling. It could have suddenly spurted into her hands and face. She took a good whiff of the greenish-yellow gas (chlorine?). She should have held the beaker some distance away and gently wafted some of the gas toward her nose.
What is the molar mas of zinc (Zn)? 6.02 g/mol 30.0 g/mol 48.7 g/mol 65.38 g/mol
Molar mass is defined by the ratio of the mass to the moles. The molar mass of zinc (Zn) in the periodic table is said to be 65.38 g/mol. Thus, option D is correct.
What is molar mass?Molar mass is the mass of the element or the compound in one mole of the given substance. It is denoted in units gm/ mol. The units come from the ratio of mass in grams to the moles in mol.
It is used to calculate the amount of the substance present in the mole of the substance and can be expressed as particles, like ions, or molecules with the help of Avogadro's number.
The molar mass or the atomic mass of the zinc element is denoted in the periodic table. The mass is written on the lower side of the element symbol.
Therefore, the molar mass of zinc (Zn) is 65.38 g/mol.
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Use the potential energy diagram shown to answer the following: Which letter shows the activation energy(without use of a catalyst)
Answer:
a
Explanation:
Activation energy is the minimum amount of energy that must be overcome before a reaction will proceed to product.
In the energy diagram, the thick line represent the uncatalyzed path while the broken line line indicates the catalyzed path.
In the diagram above, the letter between the reactant and the Peak of the diagram gives the activation energy. This letter is a.
Therefore, the activation energy for the uncatalyzed reaction is 'a'.
Identify the goal of any scientific method
Answer:
Explanation:
Forming a testable hypothesis
Devising a study and collecting data
Examining the data and reaching conclusions
Reporting the findings of the study
Which series represents the flow of thermal energy in a home with a refrigeration cooling system?
Inside air coolant in cooling system – outside air
X Fuel
- air inside piston chamber piston movement
Inside air
outside air
Fuel
Inside air
Answer
A is the answer
Which is a similarity between alcohol fermentation and aerobic respiration?
I found this information:
Anaerobic respiration begins the same way as fermentation. The first step is still glycolysis, and it still creates 2 ATP from one carbohydrate molecule. However, instead of ending with glycolysis, as fermentation does, anaerobic respiration creates pyruvate and then continues on the same path as aerobic respiration.
After making a molecule called acetyl coenzyme A, it continues to the citric acid cycle. More electron carriers are made and then everything ends up at the electron transport chain. The electron carriers deposit the electrons at the beginning of the chain and then, through a process called chemiosmosis, produce many ATP. For the electron transport chain to continue working, there must be a final electron acceptor. If that acceptor is oxygen, the process is considered aerobic respiration.
Scientists believe that fermentation and anaerobic respiration are older processes than aerobic respiration.
I hope this help. :)
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What do you mean by the ’4R principle’ to develop environment friendly habits?
Answer:
We mean this by '4R principle'
ReduceReuseRecucleThe question may be about ' 3R' principle....
are mountains physical or chemical property
Is water a physical or chemical property
is a box a physical or chemical property
is a lion a physical or chemical property
Answer:
Answer: mountains not sure
Water is chemical
Box is physical
Lion is physical
Hope this helped!!
Explanation:
A piece of unknown metal weighs 500 g. When the piece of metal absorbs 6.64 kJ of heat, its temperature increases from 25°C to 78°C. What's the specific heat capacity
of this metal?
A. 13 J/gºC
B. 0.25 J/gºC
C. 25 J/gºC
D.2.5 J/g °C
6.64×1000÷(78-25)×500=0.25 g/k
Answer:
6.64×1000÷(78-25)×500=0.25 g/k
Study this chemical reaction:
Ti+02 - TiO2
Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction.
oxidation:
reduction:
Answer:
oxidation:Ti to Ti Reduction:O2 toO2
Explanation:
oxidation loses electron while Reduction gains electron
Suppose 300 mL of 0.50 M lithium bromide solution and 300 mL of 0.70 M rubidium bromide solution are combined. What is the concentration of the bromide ion in the resulting solution?
Answer:
0.60 mol·L⁻¹
Explanation:
Data:
LiBr: c = 0.50 mol/L; V =300 mL
RbBr: c = 0.70 mol/L; V =300 mL
1. Calculate the moles of Br⁻ in each solution
(a) LiBr
[tex]\text{Moles} = \text{0.300 L} \times \dfrac{\text{0.50 mol}}{\text{1 L}} = \text{ 0.150 mol}[/tex]
(b) RbBr
[tex]\text{Moles} = \text{0.300 L} \times \dfrac{\text{0.70 mol}}{\text{1 L}} = \text{ 0.210 mol}[/tex]
2. Calculate the molar concentration of Br⁻
(a) Moles of Br⁻
n = 0.150 mol + 0.210 mol = 0.360 mol
(b) Volume of solution
V = 300 mL + 300 mL = 600 mL = 0.600 L
(c) Molar concentration
[tex]c = \dfrac{\text{moles}}{\text{litres}} = \dfrac{\text{0.360 mol}}{\text{0.600 L}} = \textbf{0.60 mol/L}[/tex]
The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.
The addition of LiBr and RbBr has been dissociated into the equal moles of Li, Rb, and Br.
[tex]\rm LiBr\;\rightarrow\;Li^+\;+\;Br^-[/tex]
[tex]\rm RbBr\;\rightarrow\;Rb^+\;+\;Br^-[/tex]
Thus 1 mole of LiBr = 1 mole Br
1 mole RbBr = 1 mole Br.
The moles of LiBr in 0.5 M solution:
Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{volume\;(ml)}[/tex]
0.5 = [tex]\rm moles\;\times\;\dfrac{1000}{300\;ml}[/tex]
Moles of LiBr = 0.15 mol
The moles of Br from LiBr = 0.15 mol.
The moles of RbBr in 0.7 M solution:
Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{volume\;(ml)}[/tex]
0.7 = [tex]\rm moles\;\times\;\dfrac{1000}{300\;ml}[/tex]
Moles of RbBr = 0.21 mol
The moles of Br from RbBr = 0.21 mol.
The total moles of Br ions from LiBr and RbBr has been :
= 0.15 + 0.21
= 0.36 mol.
The total volume of the solution will be:
= 300 + 300 ml
= 600 ml.
The concentration of the Br ion has been:
Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{volume\;(ml)}[/tex]
Molarity of Br ions = [tex]\rm 0.36\;\times\;\dfrac{1000}{600\;ml}[/tex]
Molarity of Br ions = 0.6 M.
The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.
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Explain what a limiting reactant is and describe the process to determine the limiting reactant in the example listed below: Given 3.4 grams of x compound with a molar mass of 85 g and 4.2 grams of y compound with a molar mass of 48 g How much of compound xy can be generated 2x + y2 = 2xy
Answer:
4.36g XY
I hope it helps!
Glucose has formula C6 H12 O6.
Calculate the number of Hydrogen atoms present in 18 g of glucose
please help
what errors can lead to pseudocience?
Answer:
pseudocience consists of statements, belief or practices that are claimed to be both scientific and factual but are incompatible with the scientific method.
Errors
use of vague, exaggerated or untestable claims.over-reliance on confirmation rather than refutation.lack of opennes to testing by other experts.absence of progress.personalization of issues.use of misleading language.Choose the molecule with the strongest bond. A. CH_{4} B. H_{2}O C. NH_{3} D. HF E. All are equal
The strength of the bond is based on electronegativity difference between atoms ,larger the difference stronger is the bond.The strongest bond is that of HF.
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms combine as per their electronegativity which gives bond different strengths.The electronegativity is largest between hydrogen and fluorine .Thus, HF has the strongest bond.
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Molar mass is reported on the periodic table in the units
A. kg/m3
B. grams/mole.
C. moles/gram.
D. atoms/gram.
Answer:
[tex]\boxed{\sf B. \ grams/mole}[/tex]
Explanation:
[tex]\sf The \ molar \ mass \ of \ a \ substance \ is \ the \ mass, \ in \ grams,\ per \ one \ mole.[/tex]
[tex]\displaystyle \sf \frac{grams}{mole}[/tex]
Answer:
B
Explanation:
Grams/mole is correct. Got right on test!
calculate the number of moles equivalent to 25.0 gram of copper II sulfate pentahydrate [CuSO4 5H2O]
Answer:
The answer is 0.1 molExplanation:
To calculate the number of moles in the given substance we use the equation
[tex]n = \frac{m}{M} [/tex]where
n is the number of moles
M is the molar mass
m is the mass of the substance
To calculate the number of moles we must first find the molar mass
That's
M( CuSO4 5H2O )
Cu = 64 , S = 32 , O = 16 H = 1
So we have
M( CuSO4 5H2O ) = 64 + 32 + (16 × 4) +
5( 2 + 16)
M( CuSO4 5H2O ) = 96 + 64 + 5(18)
M( CuSO4 5H2O ) = 160 + 90
M( CuSO4 5H2O ) = 250 g/mol
M( CuSO4 5H2O ) = 250 g/mol
mass of CuSO4 5H2O = 25 g
Substitute the values into the above formula
That's
[tex]n = \frac{25g}{250 \: g/mol} [/tex]We have the final answer as
n = 0.1 molHope this helps you
[tex] \LARGE{ \boxed{ \blue{ \rm{Answer}}}}[/tex]
☃️ Chemical formulae ➝ [tex]\sf{CuSO_4.5H_2O}[/tex]
How to find?For solving this question, We need to know how to find moles of solution or any substance if a certain weight is given.
[tex] \boxed{ \sf{No. \: of \: moles = \frac{Given \: weight}{Molecular \: weight} }}[/tex]
Solution:Atomic weight of Elements:
Cu = 64S = 32O = 16H = 1❍ Molecular weight of [tex]\sf{CuSO_4.5H_2O}[/tex]
= 64 + 32 + (16 × 4) + 5(2 × 16)
= 96 + 64 + 90
= 250 g/mol
❍ Given weight: 25 g
Then, no. of moles,
⇛ No. of moles = 25 g/ 250 g mol‐¹
⇛ No. of moles = 0.1 moles
⚘ No. of moles of Copper Sulphate pentahydrate in the given weight = 0.1 moles.
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Is there any evidence that a reaction has occurred?
current is changed
a precipitate is formed
the amount of ion in solution has changed
(pick one out of the three)
Answer:
A precipitate is formed
Explanation:
calculate the number of moles equivalent 10.0 gram of aluminium carbonate
[tex] \LARGE{ \boxed{ \red{ \rm{Answer}}}}[/tex]
☃️ Chemical formulae ➝ [tex]\sf{Al_2(CO_3)_3}[/tex]
How to find?For solving this question, We need to know how to find moles of solution or any substance if a certain weight is given.
[tex] \boxed{ \sf{no. \: of \: moles = \frac{given \: weight}{molecular \: weight} }}[/tex]
Solution:❍ Molecular weight of [tex]\sf{Al_2(CO_3)_3}[/tex]
= 2 × 27 + 3 × 12 + 9 × 16
= 54 + 36 + 144
= 234
❍ Given weight: 10 g
Then, no. of moles,
⇛ No. of moles = 10 / 234
⇛ No. of moles = 0.0427 moles
⚘ No. of moles of Aluminium carbonate in the given weight = 0.0427 moles.
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What must happen for water to boil at a given pressure?
O A. The water molecules must become more orderly.
O B. The water must gain thermal energy from its surroundings.
O C. The average kinetic energy of the water molecules must decrease.
D. The water must give off thermal energy to its surroundings.
Answer:
B. The water must gain thermal energy from its surroundings.
Explanation:
Boiling is the process whereby a substance is changed from a liquid state to a gaseous state due to the application of heat. For boiling to be achieved, a liquid substance must reach or exceed its boiling point, which is the specific temperature at which a specific liquid boils.
For this change of state i.e. from liquid to gas, to occur, atoms or molecules of the liquid must gain kinetic energy and move faster. However, this kinetic energy cannot be attained without a rise in temperature, which causes the molecules to gain THERMAL ENERGY or heat energy and move fast. Thermal energy is the energy that arises from a hot substance.
Therefore, for water to boil at a given pressure, it must gain thermal energy from its external surroundings, which causes its molecules to have an increased kinetic energy and move faster. This fast movement of the molecules causes the transition of phases (from liquid to gas).
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a)
A: Copper
B: CuO
C: [tex]\mathrm{CuSO_4}[/tex]
D: $\mathrm{CuCO_3}$
E: $\mathrm{CO_2}$
F: $\mathrm{Cu(NO_3)_2}$
b)
$\mathrm{CuO+ H_2SO_4}\rightarrow \mathrm{CuSO_4 + H_2O}$
c)
$\mathrm{CuCO_3+ 2HNO_3}\rightarrow \mathrm{Cu(NO_3)_2+ CO_2+ H_2O}$
Explain where you would find the actual yield and the theoretical yield needed to calculate the percent yield of a reaction. Is the answer listed above the theoretical or actual yield?
Answer:
you could get the theoretical yield by just using the molar ratio in grams. 30g of C3H8 and the molar ratio is 1, x grams of CO2 and the molar ratio is 3. Cross multiply and you'll get 90. it's way more simple
Explanation:
Is your prediction supported by the membrane potential chart? Explain your answer.
Answer:
Yes, it is. The chart shows that the initial charge of the neuron is negative. When the neuron is stimulated, sodium ions enter the cell. So, the voltage inside the cell changes to positive. When potassium ions move outward, the voltage decreases until it reaches its previous state.
Explanation:
answer on edmentum
calculate the number of moles equivalent to 5.0 gram of calcium oxide
please help
Answer:
The answer is 0.089 molExplanation:
The number of moles of a substance can be found by
[tex]n = \frac{m}{M} [/tex]
where
n is the number of moles
M is the molar mass
m is the mass of the substance
To find the number of moles we must first find the molar mass
Chemical formula for calcium oxide is
CaOSo the molar mass of CaO is
M( CaO) = 40 + 16 = 56 g/mol
Mass of CaO = 5.0g
Substitute the given values into the formula
The number of moles in 5.0g of calcium oxide is
[tex]n = \frac{5 \: g}{56 g/mol} [/tex]
We have the final answer as
n = 0.089 molHope this helps you
[tex] \LARGE{ \boxed{ \pink{ \rm{Answer}}}}[/tex]
☃️ Chemical formulae ➝ [tex]\sf{CaO}[/tex]
How to find?For solving this question, We need to know how to find moles of solution or any substance if a certain weight is given.
[tex] \boxed{ \sf{No. \: of \: moles = \frac{Given \: weight}{Molecular \: weight} }}[/tex]
Solution:Atomic weight of elements:
Ca = 40O = 16❍ Molecular weight of [tex]\sf{CaO}[/tex]
= 40 + 16
= 56 g/mol
❍ Given weight: 5 g
Then, no. of moles,
⇛ No. of moles = 5 g / 56 g mol‐¹
⇛ No. of moles = 0.089 moles [tex]\approx[/tex] 0.09 moles
⚘ No. of moles of Calcium oxide in the given weight = 0.09 moles approx.
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How many sulfur atoms are generated when 9.42 moles of H2S react according to the following equation: 2H2S+SO2→3S+2H2O
A) 8.51 × 10^24
B) 3.78 × 10^24
C) 8.51 × 10^23
D) 9.42 × 10^23
Answer:
A) 8.51 × 10²⁴
Explanation:
1. Gather all the information
2H₂S + SO₂ ⟶ 3S + 2H₂O
n/mol: 9.42
2. Calculate the moles of S atoms
The molar ratio is 3 mol S:2 mol H₂S
[tex]\text{Moles of S} = \text{9.42 mol H$_{2}$S} \times \dfrac{\text{3 mol S }}{\text{2 mol H$_{2}$S }} = \text{14.13 mol S}[/tex]
3. Calculate the atoms of S
[tex]\text{Atoms of S } = \text{14.13 mol S} \times \dfrac{6.022 \times 10^{23}\text{ S atoms}}{\text{1 mol S}} = \mathbf{8.51 \times 10^{24}}\textbf{ S atoms}[/tex]
The sulfur atoms that should be generated is [tex]A) 8.51 \times 10^24[/tex].
Given that,
9.42 moles of H2S reacted to the given equation.Also, 1 mole for the substance contains [tex]6.022 \times 10^23[/tex] no of atoms & molecules. The calculation is as follows:[tex]= \frac{3\times 6.022\times 10^23\times 0.42}{2}\\\\= 85.0909 \times 10^23\\\\= 8.509 \times 10^24\\\\= 8.51 \times 10^24[/tex]
Therefore we can conclude that the sulfur atoms that should be generated is [tex]A) 8.51 \times 10^24[/tex].
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Ice sinks in methanol, but floats on water. From this we can conclude: A The density of ice in methanol must be different from that in water. B The density of water must be less than the density of methanol. C The density of ice must be greater than the density of water. D The density of methanol must be less than the density of water.
Answer:
A
Explanation:
Density: water>ice>methanol
Ice is lighter than methanol hence it is able to float on it. However, ice is denser than water hence it sinks.
Answer:
The answer is A.
Explanation:
The density of ice in methanol must be different from that in water.
The ideal gas law is a combination of all the gas laws and states that PV = nRT. The value of n stands for
A. volume.
B. mass.
C. molecular mass
D. moles.
Answer:
d
Explanation:
p is pressure, v is vo;lume, t is temperature, r is ideal gas contstant, therefore n is the moles
