Answer: 52.17%
Explanation:
Number of matches in the box = 46
Number of matches that lit on the first strike = 22
Number of matches that did not light on the first strike = 46 - 22 = 24
Therefore, the percentage of the matches in the box did not light on the first strike will be:
= (Number of matches that did not light on the first strike / Number of matches in the box) × 100
= 24/46 × 100
= 52.17%
Therefore, the percentage of the matches in the box that did not light on the first strike is 52.17%.
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Answer:
5.ethanol and carbon dioxide
6.it contains ethyl alcohol which can be effective at killing viruses and bacteria
A(n) _____ is a hydrocarbon in which one or more hydrogen atoms is replaced by a -COOH and a -NH2 group. aldehyde carboxylic acid alcohol amino acid
Answer:
Amino Acid
Explanation:
It's part of the Amino group, which are substituted hydrocarbons.
When NH₂ and COOH replaces hydrogens on the same carbon atom in a molecule, an Amino acid is formed.
What group is a COOH?
COOH : a Carboxylic Acid group!
accessory pigments A) transfer electrons to reaction center chlorophylls. B) transfer energy to reaction center chlorophylls. C) transfer electrons from reaction center chlorophylls to pheophytins. D) transfer electrons from reaction center chlorophylls to ferredoxin. E) All of these statements are true.
Answer:
B. Transfer energy to reaction center chlorophylls.
Explanation:
Accessory pigments absorbs sunlight, these compounds are found in photosynthetic organisms, which work in conjunction with chlorophyll. Acessory pigments absorbs and transfer light energy to reaction center chlorophylls.
Why are the highest oxidation state of the transition metal stabilised in the oxide and fluoride compond?
Answer:
Following are the solution to the given question:
Explanation:
Its maximum oxidation zone is exceptionally stable and has the greatest ability to charge density, while fluoride and oxide ions are the largest particles with the largest durability of charge.
Or it might be assumed as oxygen and fluorine are the system particle atoms that have the highest electron number of metals.
I’m screwed omg i totally forgot I have school today and forgot to do this someone help me rq I’ll brainlist plslsls be awake just make sure you write the word equation for each of the following metal oxidation reactions or if you can, also write a chemical equation below it. idrm bout that but it’ll be really nice if u did.
tried doing it and if ur one of the smart people that can do science unlike me surely u’ll help. ☺️
Answer:
Zn + O2 = ZnO
Mg + O2 = MgO
Cu + O2 = CuO
Al + O2 = Al2O3
Explanation:
which energy is found in the nucleus of an atom?
Answer:
Nuclear energy.
Explanation:
It's the energy that holds protons and neutrons ( nucleons ) together, hence holds the nucleus as one.
Products formed when chlorine is produced by the electrolysis of concentrated sodium chloride solution
The products formed during electrolysis of concentrated sodium chloride solution are SODIUM HYDROXIDE and HYDROGEN GAS.
ELECTROLYSIS is the process by which electrolytes allows electric current to pass through it and is decomposed on the process.
CHLORINE is an element which can be produced industrially through the process of electrolysis of brine (concentrated sodium chloride solution). When sodium chloride is dissolved in water, it's ions separate and are capable of conducting electricity.
The products formed during this process includes:
chlorine sodium hydroxide and hydrogen gas.CHLORINE: this is released at the positive electrode during electrolysis. It is used for the following purposes:
it is used for sterilisation of water for domestic and industrial use it is used as a bleaching agent for cotton, linen and wood-pulp.SODIUM HYDROXIDE: this remains in the solution during electrolysis. It is used for the following:
processing food products, removing pollutants from water and manufacture of paper.HYDROGEN GAS:this is released at the negative electrode during electrolysis. this is used for the following:
manufacture of ammonia, hydrochloric acid and methanol it serves as constituents of many gaseous fuels such as water gas and coal gasTherefore other products during electrolysis of concentrated sodium chloride solution are SODIUM HYDROXIDE and HYDROGEN GAS.
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Although tom was a poor student, he studied very well
Câu 36: _VD _Hình lập phương có thể tích là 1253 thì diện tích đáy là:
A. cm2 B. 5cm2 C. 25cm2 D. 52cm2
Answer:
c
Explanation:
Cạnh của hình lập phương là
³\(125 = 5cm
Diện tích đáy của hình lập phương là
5²=25cm²
Đáp án C
A block of dry ice (-40°C) is placed in contact with an ice cube (-10°C).
What will happen, assuming no chemical reactions occur?
O Heat will flow from the ice cube to the dry ice.
O Heat will flow from the dry ice to the ice cube.
O There is no way to tell without a thermometer
O No heat will flow.
Explanation:
Answer is that : no heat will flow
Answer:
Heat will flow from the ice cube to the dry ice
Explanation:
Suggest why a young baby needs a lot of calcium
Câu 9: 100 g dung dịch MgCl2 9.5 % tác dụng đủ với dung dịch KOH 5,6 % .được dung dịch A và chất rắn B. Lọc rắn B và nung đến khối lượng không đổi được chất C.
a) Viết pt .Tính khối lượng răn C
b) Tính nồng độ phân trăm của dung dịch A.
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Which of the following would not be considered matter?
clouds
trees
rain
air
light
Answer:
light
Explanation:
Have a nice day
Answer:
light
Explanation:
Que. 1. Gallium has 2 naturally occuring Isotopes with mass numbers 69 & 71 respectively. What is the percentage abundance of both Isotopes if their relative atomic mass is equal to 70.59 Amu (Atomic mass Unit)
Isotopes are atoms of the same element that have different masses. The relative atomic mass (am) is a weighted average that takes into account the abundance of each isotope. We can calculate the relative atomic mass using the following expression.
[tex]am = \frac{\Sigma m_i \times ab_i}{100}[/tex]
where,
mi: mass of each isotopeabi: percent abundance of each isotopeFor Gallium,
[tex]70.59 amu = \frac{69 amu\ x + 71 amu\ y}{100}[/tex] [1]
where "x" and "y" are the unknown abundances.
We also know that the sum of both abundances must be 100%.
x + y = 100
y = 100 - x [2]
If we replace [2] in [1], we get
[tex]70.59 amu = \frac{69 amu\ x + 71 amu\ (100-x)}{100} \\7059 amu = -2 amu\ x + 7100amu \\x = 20.5[/tex]
Then, in [2]
y = 100 - x = 100 - 20.5 = 79.5
In conclusion, Ga-69 has an abundance of 20.5% and Ga-71 has an abundance of 79.5%.
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The atomic mass of calcium is calculated by adding the mass (amount) of
A) Protons and Electrons
B) Protons and Neutons
C) Electrons and Neutons
D) Protons and Protons
Answer:
B. Protons and Neutrons
Answer:
Option"B" is correct.
MARK ME BRAINLISTS
The graph shows the volume of a gaseous product formed during two trials of a reaction. A different concentration of reactant was used during each trial, whereas the other factors were kept constant.
A graph is shown with two graph lines sloping upwards. The title on the x axis is Time and the title on the y axis is Amount of Product. The graph line with a steeper slope is labeled Trial X and the other is labeled Trial Y.
Which of the following statements explains which trial has a lower concentration of the reactant? (5 points)
Trial X, because the final volume of product formed is lower than Trial Y.
Trial X, because this reaction was initially fast and later stopped completely.
Trial Y, because the reaction was initially slow and later stopped completely.
Trial Y, because the volume of product formed per unit time is lower than Trial X.
Answer:
Trial Y, because the volume of product per unit time is lower than Trial X
Explanation:
In the chemistry experimental setup, the amount of gaseous product formed by the different concentration of the trials are measured and the result is plotted on a graph
The given graph, shows;
The vertical, y-axis = The amount of product
The horizontal, x-axis = Th time of the reaction
Trial X = The graph line with a steeper slope
Trial Y = The graph line
Increase in the concentration f the reactants, increases the number of collisions, and therefore, the number of effective collisions that gives the product also increases, and the overall rate of reaction increases
A more concentrated reactants produce more product in a shorter time (yield more product in less time) than a less concentrated one, and a more concentrated reactant would have a steeper slope and therefore produce more volume of the product in less time than a less concentrated reactant, which produces a lower volume in the same time
Therefore, the trial that has a lower concentration of the reactant is Trial Y, because the volume of product per unit time is lower than Trial X.
Answer:
There ya go
Explanation:
process which take place when litimus paper turns white when dropped into a chlorine water
Answer:
It is called bleaching oxidation process.
the solubility of sugar is 250 at 60° what does it mean.
please helpp anyone please help...
Answer:
sry i don't know answer of This question
Show the comparative structure of union Parishad and Pourahava in chart.
Answer:
how will I show?
Explanation:
pLS teacher me
Which of the following is a common property of both strong acid and strong base?
a. They are good electrolytes
b. They are non-electrolytes
c. They are weak electrolytes
d. They are sour in test
Answer:
They are good electrolytes
Write the expected ground electronic configuratio for the noble gas with electron occupying 4f orbitals?
Answer:
There are main six noble gases in the periodic table. The filling of 4f-orbitals occurs after 6s orbitals. The noble gas that belongs to the sixth period is Radon. Its electronic configuration is [ X e ] 6 s 2 4 f 14 5 d 10 6 p 6 .
Therefore, the name of noble gas is Radon.
Which factors ALL increase reaction rate?
decrease temperature, stir, increase surface area, remove catalyst
none of these
increase temperature, increase surface area, add catalyst, stir
increase temperature, stir, decrease surface area, add catalyst
Answer:
increase temperature, increase surface areas, add catalyst, stir
The rate of reaction can be increased with the increase in temperature, surface area, adding catalyst and allowing stirring. Thus, option C is correct.
What is rate of reaction?The rate of reaction is given as the rate of formation of product or the rate of disappearance of reactant in unit time.
The rate of reaction can be affected with:
Increase in temperature - It will increase the collisions between the reactants, and thereby the rate.Increase in surface area - It results in increased interaction of the reactant molecules for the formation of product.Catalyst - It lowers the activation energy of the reactant, and thereby increases the rate of reaction.Stirring - It mediates the increase in the collisions and the surface area, and resulting in increased rate of reaction.Thus, the rate of reaction can be increased with the increase in temperature, surface area, adding catalyst and allowing stirring. Thus, option C is correct.
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what quantities will you need to measure to determine the specific heat of one of these liquids? (pivot)
Answer:
Specific heat capacity is measured by determining how much heat energy is needed to raise one gram of a substance one degree Celsius. The specific heat capacity of water is 4.2 joules per gram per degree Celsius or 1 calorie per gram per degree Celsius
Explanation:
Hạt nhân nguyên tử được tạo bởi
Answer:
The FitnessGram™ Pacer Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The 20 meter pacer test will begin in 30 seconds. Line up at the start. The running speed starts slowly, but gets faster each minute after you hear this signal. [beep] A single lap should be completed each time you hear this sound. [ding] Remember to run in a straight line, and run as long as possible. The second time you fail to complete a lap before the sound, your test is over.
My theoretical yield is 14 grams of water. I actually produced 6 grams of water. What is my percent yield?
Answer:
Pertaining to the interrogate, the answer to such is acknowledged and henceforth disseminated as 43.0%
Explanation:
To evaluate such, the following must be comprehended:
Percent Yield Calculator:
% Yield = (What You Actually Got / What You Should Theoretically Get) * 100
The following variables may be denoted, as stated within the interrogate:
Yielded/Produced: 6 grams.
Theoretical Yield: 14 grams.
(6 g/14 g) * 100 = 42.8571428571
*Grams measurement cancels*
42.8 ==> 43.0%
Thus, if rounded to the nearest tenth, the percent yield is equivalent to 43.0%.
If you start with 4.5 moles of aluminum and 6.5 moles of copper chloride to make aluminum chloride and copper, what is the limiting reagent?
2Al + 3CuCl -> 2AlCl3 + 3Cu
Answer:
The limiting reagent is CuCl
Explanation:
The initial number of moles of aluminum, Al = 4.5 moles
The number of moles of copper, Cu = 6.5 moles
The given chemical reaction is presented as follows;
2Al + 3CuCl → 2AlCl₃ + 3Cu
Therefore, we have, 2 moles of aluminum combine with 3 moles of CuCl produces 2 moles of AlCl₃ and 3 moles of Cu
1 mole of Al will combine with (3/2) moles of CuCl,
Therefore, 4.5 moles of Al will combine with (4.5 × (3/2) = 6.75) 6.75 moles of CuCl
Given that the number of moles of CuCl present is only 6.5 moles which is less than the 6.75 moles required to combine with the 4.5 moles, the 6.5 moles of CuCl limits the amount of AlCl₃ and Cu produced, and therefore the CuCl is the limiting reagent.
How much does the mass of 12.65-g sample of copper(II) nitrate hexahydrate decrease when heated?
hii pls help me to balance the equation thanksss
Answer:
2H2S (g) + 3O2 (g) = 2H2O (l) + 2SO2 (g)
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
[tex]\boxed{\pmb{\green{\sf{2H_{2}S(g) + 3O_{2}(g)\dashrightarrow 2H _{2}O(l)+2SO_{2}(g)}}}}[/tex]
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
According to the kinetic molecular theory, what happens to a liquid when it is transferred from one container to another?
ОООО
O The volume and the shape stay the same.
The volume increases to fill the new container, but the shape stays the same.
The volume stays the same, but the shape changes to fit the new container.
The volume and the shape change to fill the new container.
Answer:
C. The volume stays the same, but the shape changes to fit the new container.
Explanation:
It changes shape to fit the container since it's a liquid.
Which statement is true about percent yield
