Answer:
formed by burns rises quickly hydorogen
[tex] H_2+\frac12O_2 \longrightarrow H_2O[/tex]
I don't think I need to name the product.
this reaction is very exothermic. so the gases and the flames are very hot, i.e. very lighter (hot air rises) than the normal air. so it rises quickly
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.How can you guess the name of the element using the chemical formula ?
The number of protons define what element we're dealing with.
Answer: The number of protons define what element we're dealing with.
How many lead (Pb) atoms will be generated when 5.38 moles of ammonia react according to the following equation: 3PbO+2NH3→3Pb+N2+3H2O?
A) 1.62 × 10^24
B) 4.86 × 10^23
C) 2.43 × 10^24
D) 4.86 × 10^24
Answer:D. Is the correct answer
Explanation:
Following are the calculation of the lead (Pb) atoms:
Balanced reaction:
[tex]\bold{3PbO+2NH_3\longrightarrow 3Pb+N2+3H2O}\\\\[/tex]
[tex]\bold{mol\ NH_3 \longrightarrow mol \ Pb \longrightarrow atoms \ Pb}[/tex]
Calculating the number of atoms in Pb that will be generated:
[tex]=5.38 \ mol \ NH_3 \times \frac{3\ mol\ Pb}{2 \ mol NH_3} \times \frac{6.022 \times 10^{23} \times pb}{1 \ mol \ pb}\\\\ = 4.86 \times 10^{24} \ atoms\ in \ Pb\\\\= 4.86 \times 10^{24} \ atoms \\[/tex]
Therefore, the answer is "Option D"
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if a moving object changes direction, its ____ would NOT necessarily
If a moving object changes its direction, its
change.
A) speed
B) velocity
C) acceleration
A subtance X contains 10 gram of calcium carbonate calculate the number of oxygen atom present in 10 gram of calcium carbonate
[tex] \LARGE{ \boxed{ \rm{ \purple{Required \: answer}}}}[/tex]
☃️ Chemical formulae ➝ [tex]\sf{CaCO_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]
And, Then we need to find the number of molecules which can be found by:
[tex] \large{ \boxed{ \sf{no. \: of \: molecules = N_A \times no. \: of \: moles}}}[/tex]
Here, Na = Avagadro Number (6.022 × 10²³)
☀️ As it is a compund, We considered molecules. Then, we can predict the no. of atoms of elements in one molecule of compound and get the answer.
Solution:
Atomic weight of elements:
Ca = 40C = 12O = 16❍ Molecular weight of [tex]\sf{CaCO_3}[/tex]
= 40 + 12 + 3 × 16
= 52 + 48
= 100 g/mol
❍ Given weight: 10 g
Then, no. of moles,
⇛ No. of moles = 10 g / 100 g mol‐¹
⇛ No. of moles = 0.1 moles
☄ No. of moles of Calcium carbonate in the given weight = 0.1 moles
Finding no. of molecules,
⇛ No. of molecules of CaCO3 = 0.1 × 6.022 × 10²³
⇛ No. of molecules of CaCO3 = 6.022 × 10²²
Now,
1 molecule of [tex]\sf{CaCO_3}[/tex] = 3 atoms of Oxygen.Then, 6.022 × 10²² molecules will have,
= 3 × 6.022 × 10²² atoms of oxygen
= 18.022 × 10²² atoms of oxygen
In more scientific form,
= 1.8022 × 10²³ atoms of oxygen
☄ Hence, Final answer - 1.8022 × 10²³ atoms
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calculate the number of moles equivalent to 12.7 gram of iodine molecule
[tex] \LARGE{ \boxed{ \purple{ \rm{Answer}}}}[/tex]
☃️ Chemical formulae ➝ [tex]\sf{I_2}[/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{I_2}[/tex]
= 2 × 126.90
= 253.80
= 254 (approx.)
❍ Given weight: 12.7
Then, no. of moles,
⇛ No. of moles = 12.7 / 254
⇛ No. of moles = 0.05 moles
⚘ No. of moles of Iodine molecule in the given weight = 0.05 moles
━━━━━━━━━━━━━━━━━━━━
Answer:
The answer is 0.05 molExplanation:
To find the number of moles (n) we use the formula
[tex]n = \frac{m}{M} [/tex]
Where
n is the number of moles
m is the mass of the substance
M is the molar mass
To find the number of moles we must first find the molar mass
Since iodine is a diatomic molecule
M( I ) = 127 × 2 = 254 g/mol
Mass of iodine = 12.7 g
So the number of moles in 12.7 g of iodine is
[tex]n = \frac{12.7 \: g}{254 \: g/mol} [/tex]
We have the final answer as
n = 0.05 molHope this helps you
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:
remember that it takes 2 electrons to form a bond how many bonds does CIO 3 - have, the chlorate ion
Answer:
3 bonds
Explanation:
solve this by doing the lewis structure for CIO3
Answer:
3 bonds.
Explanation:
2 double bonds and one single bond.
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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PLZ HELP I WILL GIVE BRAINLY AND POINTS
Put the steps of the scientific method into the correct order.
Devise an experiment to prove or disprove.
State conclusions.
Conduct a literature search.
Define the problem.
Propose a hypothesis.
Answer:
1. Define the problem
2. Conduct a literature search
3. Propose a hypothesis
4. Devise an experiment to prove or disprove
5. State conclusions
Explanation: In order to begin an experiment, you must first define a problem or question that you will be answering. Then you must research the problem in order to form a hypothesis, or an educated guess. Then you should devise and execute an experiment to answer your question. The conclusions that you draw will either prove or disprove your hypothesis. Hope this helps!
Over a long period of time, a group of people were exposed to high degrees of UV radiation from the sun. While no one became sick immediately, doctors did predict that those exposed had an increased risk of cancer in skin cells. Which type of mutation will this exposure cause? A. acquired, harmful B. acquired, neutral C. inherited, beneficial D. inherited, neutral
Answer:
acquired/harmful
Explanation:
This type of mutation and exposure will cause indefinite problems.
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....
Who invented the Periodic table? And why Periodic tables are useful?
Answer:
It also helps them understand how life works. It even helps them predict how new materials will behave. In 1869, Dmitri Mendeleev, a Russian chemist, proposed the periodic law and his first periodic table. He published this periodic table two years later in a textbook, The Principles of Chemistry.
Explanation:
Answer:
Dmitri Mendeleev, To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered
Explanation:I have already done this
Why do scientists use models, and why do all models have limitations???
Plsss help! :) I will give brainliest!! :)
Answer:
Scientists use models to represent data/evidence. However, all models have limitations. However, models are simplified versions of reality, and can't be totally accurate in representation.
Hope this helps :)
Answer:
Since models are simpler than real objects or systems, they have limitations. ... It may not predict the behavior of the real system very accurately. But the more computing power that goes into the model and the care with which the scientists construct the model can increase the chances that a model will be accurate.
Which of these is the definition of the EXPLODE Physical Hazard?
A) Chemicals that are likely to be flammable and/or support a fire
B) Chemicals that release high pressure and could cause bodily injury
C) This is a potential reaction that could take place when two chemicals are
mixed together.
D) This is when a chemical breaks down and could become harmful when
handled improperly or exposed to extreme temperatures
Answer:
Explanation:
Physical hazard means a chemical for which there is scientifically valid evidence that it is a combustible liquid, a compressed gas, explosive, flammable, an organic peroxide, an oxidizer, pyrophoric, unstable (reactive) or water-reactive.
EXPLODE:
to expand with force and noise because of rapid chemical change or decomposition, as gunpowder or nitroglycerine (opposed to implode).
to burst, fly into pieces, or break up violently with a loud report, as a boiler from excessive pressure of steam.
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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CH2OCH2 is an organic compound with an oxygen atom bonded between the two carbon atoms, and it is not very soluble in water. What type of compound is this?
Alcohol
Amine
Carbohydrate
Ether
Answer:
D) Ether
Explanation:
Ethers are oxygen atoms bonded between two carbon atoms. Also, I just took the test :)
CH2OCH2 is an organic compound with an oxygen atom bonded between the two carbon atoms, and it is not very soluble in water is an ether compound.
So, option D is correct one.
What is an ether?An ether is the functional group of organic compound in which one oxygen atom bonded by two alkyl group or aryl group is called an ether.
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What launched the era of modern science in the 17th century?
Answer:
Galileo Galilei
What launched the era of modern science in the 17th century? Modern science began in the 17th century, when the Italian physicist Galileo Galilei revived the Copernican view.
hope this helps
Explanation:
Answer:
Explanation:
What launched the era of modern science in the 17th century? Modern science began in the 17th century, when the Italian physicist Galileo Galilei revived the Copernican view.
When does a solar Eclipse happen, and how?
Answer:
Solar Eclipse happens when the moon gets between the sun and the earth, the moon gets all the light and blocks the earth from getting sunlight.
Hope this helps ;) ❤❤❤
The subscripts in a chemical formula are the number of
of a particular atom in one mole of the molecule.
A. reactants
B. atoms
C. moles
D. molecules
Answer:
d.molecules.its the answer.
Answer: B. molecules
Explanation:
it is the answer
Which criteria are responsible for deciding whether a heterogeneous mixture is a colloid or a suspension?
A.
whether its composition is uniform and transparent
B.
whether the particles remain suspended for an extended period of time
C.
whether it can be separated into simpler substances through physical separation techniques
D.
whether the ratio of components is fixed
Answer: C.
whether it can be separated into simpler substances through physical separation techniques
Explanation:
A heterogeneous mixture is colloidal if
Particles cannot be seen with a naked eye.Particles can pass through filter paperIt doesn't undergo sedimentation.A heterogeneous mixture is suspension if
Particles can be seen with a naked eye.Particles cannot pass through filter paperIt undergoes sedimentation.So, the criteria are responsible for deciding whether a heterogeneous mixture is a colloid or a suspension is "whether it can be separated into simpler substances through physical separation techniques".
So, the correct answer is "c".
calculate the number of moles equivalent to 20.0 gram of calcium phosphate
please help
[tex] \LARGE{ \boxed{ \red{ \rm{Answer}}}}[/tex]
☃️ Chemical formulae ➝ [tex]\sf{Ca_3(PO_4)_2}[/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 = 40P = 31O = 16❍ Molecular weight of [tex]\sf{Ca_3(PO_4)_2}[/tex]
= 3 × 40 + 2 × 31 + 8 × 16
= 120 + 62 + 128
= 310 g/mol
❍ Given weight: 20 g
Then, no. of moles,
⇛ No. of moles = 20 g / 310 g mol‐¹
⇛ No. of moles = 0.0645 moles
⚘ No. of moles of Calcium phospate in the given weight = 0.0645 moles.
━━━━━━━━━━━━━━━━━━━━
Answer:
The answer is 0.08molExplanation:
To find the number of moles in calcium phosphate we use the formula
[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 phosphate is
Ca3( PO4)2
Ca = 40 , P = 31 , O = 16
So the Molar mass of calcium phosphate is
M( Ca3( PO4)2 ) = (20×3) + 2( 31 + (16×4)
= 60 + 2( 31 + 64)
= 60 + 2(95)
= 60 + 190
Molar mass of calcium phosphate =
250g/mol
Mass = 20 g
So we have
[tex]n = \frac{20g}{250g/mol} [/tex]
We have the final answer as
n = 0.08 molHope this helps you
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: