Answers
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.
TEST: use a burning splint
If hydrogen is present it will burn with a pop sound.
C) Copper
D) Iron
Related Questions
What is the shape of the following molecule? AIF_3
Answers
Answer:
AI + F2 = AIF3
Explanation:
Answer:
The molecular geometry of AlF3 is trigonal planar with a symmetric charge distribution on the central atom. Therefore this molecule is non-polar.
Glucose has formula C6 H12 O6.
Calculate the number of Oxygen atoms present in 18 g of glucose
Answers
Explanation:
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1
10
⋅
m
o
l
×
24
⋅
atoms
⋅
m
o
l
−
1
×
N
A
,
where
N
A
=
6.022
×
10
23
⋅
m
o
l
−
1
.
Explanation:
We take the quotient.....
Number of moles
=
Mass of substance
⋅
g
Molar mass
⋅
g
⋅
m
o
l
−
1
=
Mass of substance
⋅
g
Molar mass
⋅
g
⋅
m
o
l
−
1
=
1
1
m
o
l
=
m
o
l
And thus we get an answer with dimensions of
m
o
l
as we require...
And so we retake the quotient.......
Number of moles of glucose
=
18
⋅
g
180.16
⋅
g
⋅
m
o
l
−
1
=
?
?
⋅
m
o
l
.
We know that glucose,
C
6
H
12
O
6
, has a formula of
180.16
⋅
g
⋅
m
o
l
−
1
, i.e.
(
6
×
12.011
+
12
×
1.00794
+
6
×
16.00
)
⋅
g
⋅
m
o
l
−
1
=
?
?
⋅
g
⋅
m
o
l
−
1
......
We are not finished there, because we were asked to find the number of atoms in such a molar quantity, and there are 24 atoms in one molecule of glucose.
And so we multiply the molar quantity by number of atoms per mole, and then by Avogadro's number to get the number of atoms,
18
⋅
g
180.16
⋅
g
⋅
m
o
l
−
1
×
24
⋅
atoms
⋅
m
o
l
−
1
×
N
A
18
⋅
g
180.16
⋅
g
⋅
m
o
l
−
1
×
24
⋅
atoms
⋅
m
o
l
−
1
×
6.022
×
10
23
⋅
m
o
l
−
1
=
?
?
What is the molar mas of zinc (Zn)? 6.02 g/mol 30.0 g/mol 48.7 g/mol 65.38 g/mol
Answers
See the attached picture. The number below 'Zn' is the molar mass. The closest answer choice is 65.38
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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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
Answers
Answer:
4.36g XY
I hope it helps!
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?
Answers
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:
Which is a similarity between alcohol fermentation and aerobic respiration?
Answers
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. :)
have a good day!
Both begin with glycolysis.
Both occur in mitochondria.
Both require oxygen to proceed.
Both end with the electron transport chain.
Glucose has formula C6 H12 O6.
Calculate the number of Hydrogen atoms present in 18 g of glucose
please help
Answers
Given the connection between Aw and K (Aw=2k) could you use the ideal gas law and derive the Boltzmann constant. Water freezes at 546.3 Aw and absolute zero is at 0 Aw. (Aw is an arbitrary temperature scale.)
solved, divide boltzmann constant by 2
Answers
Answer:
tails of comets
the ionosphere
a neon sign
Explanation:
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Answers
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)
$\mathrm{CuCO_3+ 2HNO_3}\rightarrow \mathrm{Cu(NO_3)_2+ CO_2+ H_2O}$
(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
Answers
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
Which two objects in space formed from the huge disk of ice and debris beyond the outer planets?
Answers
Answer:
Pluto and Comets! I hope this helps you!
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.
Answers
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.
After swimming in the pool on a very hot day, Sarah had a glass of ice water. Over time, the water on her skin evaporated, and the ice cubes melted in the glass. How
many states of water existed in this scenario?
A. 3
B. 1
C. 4
D. 2
Answers
I am sure the answer is A
Examine the assumption. Assumption: The Earth is flat. Which statements accurately describe how the assumption affects scientific thinking? (Select all that apply. People think the Earth is flat, so they think that the Earth does tilt on its axis while revolving around the Sun. People think the Earth is flat, so they think that it is only safe to travel certain distances from a given location. People think the Earth is flat, so they think that when the Sun sets, it goes underneath the Earth. People think the Earth is flat, so they think that when traveling in a straight line, there is no end.
Answers
Answer:
The statements that accurately describe how the assumptions affects scientific thinking are;
People think that the Earth is flat, so they think that it is only safe to travel certain distances from a given location.
People think that the Earth is flat, so think that when the Sun sets, it does underneath the Earth
Explanation:
The proof that the Earth is round was made by the Greek philosopher, Aristotle, over 2,000 years ago, by observation of the change in the constellation of the stars as a person changes his position North or South
The initial belief was that the Earth is flat disc surrounded by water, while the it was believed that the shape of the Earth was that of a square with four mountains at the vertices that support the sky from falling.
Stars are _____
for most of their lives.
A) stable
B) unstable
C) unpredictable
Answers
Answer:
A. Stable
Explanation:
unless ur talking about the star in your PFP, then it's unstable xd
Answer:c
Explanation:
The study of such concepts as motion, force, energy, matter, heat, sound, light, and the components of atoms is:
Answers
Answer:
chemistry
Explanation:
How many moles of steam, H 2 O react with 1 mol of charcoal, Caccording to the balanced chemical equation? C(s)+H 2 O(g)\ \ CO(g)+H 2 (g)
Answers
Answer:
1 mol
Explanation:
Given:
C(s) + H₂O(g) → CO(g) + H₂(g)
According to the given equation, we can say that 1 mol of steam( H₂O ) reacts with 1 mol of charcoal.
So, 1 mol of steam( H₂O ) is the correct answer.
How is the definition of the word theory different in science versus in everyday life?
A. In everyday speech a theory is the same as a hypothesis-a statement that has (been) tested. In science a theory is a synthesis of a large body of verified information
B. In everyday speech a theory is the same as a hypothesis-a statement that has ( not been) tested. In science a theory is a synthesis of a large body of verified information
Answers
Answer:
The second option is correct.
In everyday speech a theory is the same as a hypothesis-a statement that has ( not been) tested. In science a theory is a synthesis of a large body of verified information. The correct option is B.
What is a hypothesis?A hypothesis is an explanation proposed for a phenomenon. The scientific method requires that a hypothesis be testable in order for it to be considered a scientific hypothesis.
Scientists typically base scientific hypotheses on previous observations that cannot be adequately explained by existing scientific theories.
It aids in providing a link between the underlying theory and the specific research question.
It aids in data analysis and assesses the research's validity and reliability. It serves as a foundation or proof of the research's validity.
A theory is the same as a hypothesis in everyday speech—a statement that has (or has not been) tested. A theory in science is a synthesis of a large body of verified information.
Thus, the correct option is B.
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Enumerate any two differences between simple distillation and fractional distillation.
Answers
Answer:
Explanation:
By simple distillation, we can separate tow miscible liquids having sufficient difference in their boiling points.
By fractional distillation, we can separate the mixture of two or more miscible liquids for which the difference in their boiling point is less than 25k
Simple distillation is done using an air condenser or water condenser.
Fractionating column is fitted in between the distillation flask and the condenser for the process.
Simple distillation eg: mixture of water and acetone
fractional distillation eg: crude oil
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Answer:
Simple Distillation:
1)This method is used for the separation of components of a mixture containing two miscible liquids that boil without decomposition.
2)The components must have sufficient difference in their boiling points.
Fractional Distillation:
1)Fractional distillation process is used to separate a mixture of two or more miscible liquids.
2)If, the components have the difference in boiling points less than 25K .
A substance X contains 10 gram of calcium carbonate calculate the number of oxide of calcium carbonate present in X
please help
Answers
Answer:
I got 0.01 moles, hope this helps!
O3/Caco3 = 48/100 (molar masses ) = x/0.1. ( using moles ) then you will get x = 0.048 moles
Organisms can either be made of one cell or made of more than one cell
Answers
Answer:
The statement is true.
Explanation:
Organisms can be unicellular (made up of one cell) or multicellular (consisting of more than one cell).
I hope this helps in any way :)
Use the potential energy diagram shown to answer the following: Which letter shows the activation energy(without use of a catalyst)
Answers
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'.
The lock-and-key mechanism refers to
the complementary shapes of an enzyme and a substrate.
the attractive forces between an enzyme and a substrate.
the ability of an enzyme to lower the activation energy of a reaction.
the ability of an enzyme to "unlock" the products of a reaction.
Answers
Answer:
A). The complementary shapes of an enzyme and a substrate.
Explanation:
The Lock-and-key mechanism was proposed by Emil Fischer for the first time and characterized as the metaphor which helps in elucidating the specificity of the enzymatic reactions. In this metaphor, the lock is described as the enzyme while 'key' is characterized as the substrate which the enzyme acts upon. If the key is not appropriately sized, it will not fit into the active site i.e. the keyhole of the lock or enzyme and reaction will not take place. Thus, option A is the correct answer.
What do you mean by the ’4R principle’ to develop environment friendly habits?
Answers
Answer:
We mean this by '4R principle'
ReduceReuseRecucleThe question may be about ' 3R' principle....
Use the drop-down menus to identify each type of galaxy pictured.
Galaxy A:
Galaxy B:
Galaxy C:
Answers
Galaxy B: irregular
Galaxy C: spiral
Hope this can help
What makes a good scientific question???
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Answers
Answer:
A good question is testable, detailed, measured, and controlled.
Just let me know if you have any other questions.
What is the difference between data and evidence???
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Answers
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REACTION OF DILUTE SULPHURIC ACID WITH COPPER (II) CARBONATE
CuCO3 (s) + H2S04 (aq)———> CuSO4(aq) +CO2(g)+ H2O (l)
REACTION OF COPPER (II) OXIDE WITH DILUTE SULPHURIC ACID
CuO (s) + H2SO4 (aq)———> CuSO4 (aq) + 2H2O (l)
Answer:
The other person was correct =w0
Explanation:
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.
Answers
Answer:
d
Explanation:
p is pressure, v is vo;lume, t is temperature, r is ideal gas contstant, therefore n is the moles
9 different lab rules Explain how students will do a safe lab
Answers
Answer:
Report all accidents, injuries and breakage of class or equipment to instructor immediately.Keep pathways clear by placing extra items on the shelves or under the work tables. If under the tables make sure that these items can no be stepped on.Long hair (chin-length or longer) must be tied back to avoid catching fire.Wear sensible clothing including footwear. Loose clothing should be secure so they do not get caught in a flame or chemicals.Work quietly - know what you are doing by reading the assigned experiment before you start to work. Pay close attention to any cautions described in the laboratory exercises.Do not taste or smell chemicals.Wear safety goggles to protect your eyes when heating substances, dissecting, etcDo not attempt to change the position of glass tubing in a stopper.Never point a test tube being heated at another student or yourself. Never look into a test tube while you are heating it.Hope this helps:))
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2. If something breaks step away and do not try to fix it
3. Do not smell or eat the chemicals it is very dangerous
4. Do not put anything up to your eye.
5. Make sure you do not wear something loose so it does not interfere with anything.
6. Do not run or anything with testing tubes.
7. Pay close attention when doing something with chemicals, you do not want to go wrong or explore something up.
8. If glass breaks or something goes wrong, such as accidents or injuries tell the teacher.
9. Do not take off anything you are suppose to wear in class, such as safety goggles, also do not try to mess with chemicals.