Answer:
D. one red straw and one green straw.
State the type of reaction and balance it properly: NaOH + CaBr2 → Ca(OH)2 + NaBr
Answer:
2NaOH(aq) + CaBr2(s) → Ca(OH)2(s) + 2NaBr(aq)
The given chemical equation depicts chemical reaction of double displacement type and it's balanced chemical equation is 2 NaOH + CaBr₂ [tex]\rightarrow[/tex] Ca(OH)₂ + 2 NaBr.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Why are mass of atoms called relative masses?
The atomic mass constant (symbol: mu) is defined as being 112 of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative.
Write the formula of the first five members in the series of alkynes
Which of the following correctly orders the
events in atomic history?
A. The atom has a small dense positive
nucleus.
B. The atom was a small dense sphere
C.Electrons exist in orbitals, or the most
probable location
D. The atom at electrons stuck in an overall
positive atom
E. Electrons exist in perfect orbits based on
energy levels.
The history of the atom passed through a certain sequence until our recent interpretation of atomic theory.
The correct sequence of atomic theory is;
The atom at electrons stuck in an overall positive atomThe atom has a small dense positive nucleus. Electrons exist in perfect orbits based on energy levels.Electrons exist in orbitals, or the most probable locationThe beginning of the atomic theory saw the discovery of J.J Thompson which led to the plum - pudding model in which the atom was described as a sphere in which electrons are stuck in an overall positive atom.
This was followed by Rutherford's planetary model in which he concluded that the atom has a small dense positive nucleus. This was followed by the model of Bohr in which the electrons exist in perfect orbits based on energy levels.
Lastly, the contemporary model of the atom is called the wave - mechanical model in which electrons exist in orbitals, or the most probable location.
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how do you expect the size of the atoms to change as you go from neon to argon to krypton
Answer:
The number of energy levels will increase.
Explanation:
As they are all Noble Gases, they are all in the same family. However, as you go further down the list of Noble Gases, the period number increases. The period number shows the number of energy levels. Hence, an increase in energy levels.
The size of the atoms (atomic radius) would increase down the group from neon to argon to krypton.
What is atomic radius?Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element, typically from the nucleus to its valence electrons.
The trends of atomic radius.Generally, the atomic radius of a chemical element decreases across the periodic table, from alkali metals (group 1 elements) to noble gases (group 8 elements). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).
In this context, the size of the atoms (atomic radius) would increase down the group from neon to argon to krypton.
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SH
&H - HD
H)
iH)
CH=CII CH
-
CH,
H
SH
For which salt is the aqueous solubility most likely to change by changing the pH of the solution?
a) CaF2(aq)
b) CaCl2(aq)
c) CaI2(aq)
d) CaBr2(aq)
The salt whose aqueous solubility will most likely to change the pH of the solution is CaF2(aq).
The pH of a salt solution depends on the nature of the acid and base that forms the salt.
Salt of a weak acid and a strong base yields a basic solutionSalt of a strong acid and a weak base yields an acidic solutionSalt of a strong acid and a strong base yields a neutral solution.Since HF is a weak acid, its salt CaF2 will be slightly basic when dissolved in water hence the pH of the solution is altered.
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Why was the morning session stopped unsuccessfully?
The reactor was overheating.
The automatic control system was not adjusted properly.
The vernier control rod became stuck.
The emergency rod failed.
Answer:
the reactor was overheating
How many ML of 0.44 M HCl are needed to dissolve 9.83 g of BaCO3
Answer:
nBACO3=m/M=9,83/197=0,05(mol) ->nHCl=0,05.2/1=0,1(mol) =>VHCl=n/CM=0,1/0,44=0,227(lít)
Explanation:
AcipHex is classified as
Answer:
Rabeprazole belongs to a class of drugs known as proton pump inhibitors (PPIs).
How many moles of carbon are 8.7x1023 atoms of carbon?
One mole of every substance contains 6.022×10²³ number of atoms. One mole carbon have these much atoms and thus number of moles of carbon having 8.7 × 10²³ atoms is 1.44 moles.
What is carbon?Carbon is 6th element in periodic table. It is a p block element and is a non-metal. Carbon forms covalent bonds with other elements.
One mole of every elements contains 6.022×10²³ number of atoms and it is called Avogadro number. Similarly one mole of a compound contains 6.022×10²³ number of molecules.
The number of atoms in one mole of carbon is 6.022×10²³.Therefore, number of moles of carbon which contains 8.7 × 10²³ atoms is calculated as follows:
number of moles of carbon = 8.7 × 10²³/6.022×10²³
= 1.44 moles.
Therefore, the number of moles of carbon containing 8.7 × 10²³ atoms is 1.44 moles.
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what is the percent by mass of chlorine in potassium chloride
Answer: Originally Answered: A sample of 0.892g of potassium chloride is dissolved in 54.6g of a water. What is the percent by mass of the potassium chloride in this solution?
Well, take the quotient…
0.892∙g0.892∙g+54.60∙g×100% percentage by mass potassium chloride
≈2%
Explanation:
Complete the paragraph below. Do it using your Science journal or notebook
SUSPENSION IS A KIND OF MIXTURE____________________________
_________________AS IT________________________________AT THE BOTTOM WHEN LEFT UNDISTURBED
Answer:
SUSPENSION IS A KIND OF MIXTURE where particlea are visible to the naked eyes AS IT settled AT THE BOTTOM WHEN LEFT UNDISTURBED.
A 125g sample of a mixture of salt and sand contains 12% salt.
a. How much salt (in g) does the sample contain?
b. How much sand (in g) does it contain?
this one too please lol
Answer:
It looks like 43 to me, so 43 ml?
Explanation:
I'd say that's 43ml
Hope this helps- have a good day bro cya)
Kaya is riding her dirt bike eastward on a dirt road. She spots a pothole ahead. Kaya slows from 20.0 m/s to 6 m/s in 6.0 s. What is her acceleration?
[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{6-20}{6}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{-14}{6}[/tex]
[tex]\\ \sf\longmapsto Acceleration=-2.3m/s^2[/tex]
The best representation of the ozone molecule incorporates both of the structures that you drew in parts C and D.
Redraw the Lewis structures of an ozone molecule and place a two-ended arrow between the structures, pointing to both
of them. This representation is called a resonance structure.
Answer:
Explanation:
EDMENTUM
The Lewis structure for ozone contains a central oxygen atom that has a double bond to one oxygen atom and a single bond with the other oxygen atom. The resonance structure of the ozone is shown in the attached figure below.
What is the lewis structure of the ozone molecule?The oxygen molecule has a valency of -2. It can form two-sigma bonds or covalent bonds with the other atoms. Oxygen contains three lone pairs to form π bonds with other atoms. Ozone contains all three oxygen atoms and is a dihedral molecule with sp² hybridization.
Lewis structure is generally based on the octet rule which states that there should be eight electrons in the valence shell or orbit of an atom for a stable molecule.
The lone pair on the central oxygen atom repels the electrons in the two side bonds and adopt a bent molecular geometry. The expected geometry is the trigonal planar with a bond angle is 120°.
In an ozone molecule, six valence electrons for each molecule of Oxygen so the total number of valence electrons is 6 × 3 = 18. As both Oxygen atoms on the sides have the same electronegativity, therefore, the double bond keeps on shifting from both causing resonances.
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A substance has a freezing point of –38°C and a boiling point of 356°C. At what temperature would this substance be in its liquid state?
A) -100°C
B) -50°C
C) 80°C
D) 375°C
Answer:
X. 80°
Explanation:
if the substance is below -38 then it is in the solid phase (-100° and -50°) and if it is above 356° it is a gas (375°). Therefore anything in the middle is a liquid, 80°.
Given that the substance freezes at –38°C and boils at 356°C, it will be a liquid at a temperature of 80°C.
What is liquid range?The term liqiid range refers to the temperatire range within which a substance remains in its liquid state. Now we are told that the substance freezes at –38°C and boils at 356°C.
Hence, we expect that this substance will be in the liquid state at a temperature of 80°C.
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Determine the mass percentage of carbon, C, hydrogen, H, and oxygen, O, in C6H8O7. Refer to the periodic table for the atomic mass of each element.
Answer:
C=37.5% H=4.2% O=58.3%
Explanation:
molar mass of element / molar weight of compound X 100% (for each element)
C mass = 12 x 6 = 72
H mass = 1 x 8 = 8
O mass =16x 7 = 112
Molar weight of compound = 192
72/192(100%)= 37.5% C
8/192(100%) = 4.2 % H
112/192 (100%) = 58.3% O
The mass percentage of carbon, hydrogen, H, and oxygen, O, in C₆H₈O₇ is C = 37.5% H = 4.2% O = 58.3%.
What is the mass percentage?The concentration of an element in a compound or component in a combination is calculated by the mass percentage.
The collective of a component is divided by the entire mass of the mixture to obtain the mass percentage, which is then multiplied by 100%.
Given, finding the mass percentage of carbon, hydrogen, H, and oxygen, O, in C₆H₈O₇
the molar mass of element / molar weight of compound X 100% (for each element
First, calculate the molar mass of the elements given in the compound.
C mass = 12 x 6 = 72
H mass = 1 x 8 = 8
O mass =16x 7 = 112
Molar weight of compound = 192
72/192(100%)= 37.5% C
8/192(100%) = 4.2 % H
112/192 (100%) = 58.3% O
Thus, the mass percentage is C = 37.5% H = 4.2% O = 58.3%.
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The electronic structure 1s22s22p63523p64523d8 refers to the ground state of
Kr.
Ni.
Pd.
Fe.
none of the above.
Previous
Answer:
Ni
Explanation:
Electronic configuration given by
[tex]\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^23d^8[/tex]
No expectations so it's Z=28Element is nickel
What is the name for the electrons involved in metallic bonding ?
Answer:
valence electrons
Explanation:
Why is protection from radiation needed?
Answer:
Because you could die or get seriously burn bad
Answer:
Radiation protection aims to reduce unnecessary radiation exposure with a goal to minimize the harmful effects of ionizing radiation. ... As radiation exposure becomes more prevalent, a thorough understanding of radiation exposure risks and dose reduction techniques will be of utmost importance.
Explanation:
Some changes in matter may results to 1. _ or 2._ effects in the environment. We have to do our share in maintaining 3. environment. We must 4. too much use of electricity and gasoline. We must also avoid 5. rubber tires and plastics. We must avoid practices that will produce acid rain, increase global temperature, or deplete the ozone layer. pls i need answers
Answer:
C
Explanation:
PLEASE MARK AS BRAINLIEST!!!!!Why has the acidity of the ocean increased over the years?
A.Sediment deposits cannot replenish quick enough in order to affect the acidity
B.Not enough basic solutions in the ocean
C. Waste from ocean life
Answer:
I think it's A
Explanation:
Carbon dioxide is added to the atmosphere whenever people burn fossil fuels. ... As the amount of carbon dioxide in the atmosphere rises, the oceans absorb a lot of it. In the ocean, carbon dioxide reacts with seawater to form carbonic acid. This causes the acidity of seawater to increase.
Jim makes a table that lists soluble and insoluble substances. Which statement best explains why the table is incorrect?
a table with the titles Soluble and Insoluble, written underneath Soluble is sugar, food coloring, and honey, and written underneath Insoluble is sand, grass, and salt
A. Food coloring is an insoluble substance.
b. Honey is an insoluble substance.
C. Grass is a soluble substance.
D. Salt is a soluble substance.
Answer:
D
Explanation:
The statement that best explains why the table is incorrect is: Grass is a soluble substance. Option C is correct.
In the table, grass is listed under "Insoluble," but in reality, grass is not a substance that dissolves in water. It is a complex mixture of various compounds, including cellulose and other organic materials, which are not water-soluble. Grass does not dissolve when added to water; instead, it remains intact and is not readily soluble.
On the other hand, all the other substances listed in the table are correctly categorized. Sugar, food coloring, and honey are soluble substances because they dissolve in water. Sand and salt are insoluble substances because they do not dissolve in water.
Hence, C. is the correct option.
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Check all of the following that are mixtures.
A) Water
B) Iron
C) Milk
D)Trail mix
explain why the reaction between calcium carbonate and sulphuric acid would not get to completion
Answer:
The calcium sulphate is insoluble in dilute sulphuric acid and so you end up with calcium carbonate coated in a layer of calcium sulphate, which stops the acid from getting at the carbonate and so stops the reaction. so you would not get any completion .
15 and extra credit not 14
write the formulas of the above. compounds and the symbol of its elements.
Answer:
a.MgO
b.CaO
c.SO2
d.Na2O
e.CO2
What is the most unique element and why
Answer:
The answer is Aluminium.
Explanation:
It has low density, is non-toxic, has a high thermal conductivity, has excellent corrosion resistance and can be easily cast, machined and formed. It is also non-magnetic and non-sparking. It is the second most malleable metal and the sixth most ductile.