Answer:
An atom is the smallest particle of an element and is the building block of all matter.
Write down the names of the new substances formed when each of the following substances reacts with dilute hydrochloric acid: (i) ammonia (ii) sodium hydroxide (iii) calcium carbonate
The names of the new substances formed are:
1) ammonium chloride (NH₄Cl)
2) Sodium chloride (NaCl)
3) Calcium chloride (CaCl₂) and carbon(IV) dioxide (CO₂)
1) Balanced chemical equation for reaction of ammonia (NH₃) and dilute hydrochloric acid (HCl):
HCl + NH₃ → NH₄Cl
2) Balanced chemical equation for reaction of sodium hydroxide (NaOH) and dilute hydrochloric acid:
HCl + NaOH → NaCl + H₂O
3) Balanced chemical equation for reaction of calcium carbonate (CaCO₃) and dilute hydrochloric acid:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
These chemical reactions are double displacement reactions, cations and anions of the two reactants switch places and form two new compounds.
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A molecule with a trigonal bipyramidal electron geometry must have a central atom with how many bonding and nonbonding electron groups around it?
A molecule with a trigonal bipyramidal electron geometry must have a central atom with how many bonding and nonbonding electron groups around it Equatorial.
An atom is a single neutral particle. A molecule is a neutral particle with two or more atoms bonded together. Water is a simple molecule consisting of one oxygen atom bonded to two different hydrogen atoms. The bond is a polar covalent bond (polar bond) due to the high electronegativity of the oxygen atom.
About 99% of the body consists of atoms of hydrogen, carbon, nitrogen, and oxygen. It also contains much smaller amounts of other elements necessary for life. Something like table salt (NaCl) is a compound because it is made up of multiple elements (sodium and chlorine), but it is not a molecule because the bonds that hold NaCl together are ionic bonds.
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1. How much NaCl can you get from 20g of NaOH?
NaOH + HCl →→ NaCl + H₂O
Answer:
29.25g
Explanation:
Number of moles = Mass / Molar mass
Number of moles of NaOH = 20g/(23 + 16 + 1)
= 0.5mol
1 mol of NaOH = 1 mol of NaCl
Therefore, 0.5mol of NaOH = 0.5mol of NaCl
0.5mol = Mass of NaCl / (23 + 35.5)
Mass = 0.5 × 58.5
= 29.25g
I hope this helps! ^^
what should you be careful of when measuring the temperature of a liquid in a beaker
The precaution to be taken while measuring the temperature of a liquid in a beaker is applying proper heat balance and taking all the required precautions.
A beaker with an open top contains a sample of liquid. It exposes this sample to light. That liquid absorbs the light energy, turning it into heat energy. As a result, the liquid becomes warmer and evaporation is accelerated. As a result, there is less liquid in the beaker. Since it is well known that the surface temperature of a liquid, along with air movement above the liquid surface, is one of the dominant factors affecting evaporation, I want to measure the evaporation rate as a function of surface temperature.This can be done by applying a heat balance.Learn more about heat balance at:
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Which transition metals usually form only one monatomic cation? select all that apply.
Zn, Cd, and Ag are transition metals that usually form only one monoatomic cation.
A monatomic cation is a cation made of only one atom.
Cations are positively charged ions, in this example Ag⁺, Cd²⁺ and Zn²⁺.
These cations form only one type of ion, while iron and copper form more than one type of cations.
Iron and copper form cations with different charges (Fe²⁺, Fe³⁺, Cu⁺, Cu²⁺).
It depends on electron configuration which type would be formed.
Electron configuration of zinc atom: ₃₀Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²
Transition metals are elements in the d-block of the Periodic table.
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46. how many moles are there in each sample!
a. 55.0 g ti
b. 16.9 mg na
c. 7.95 x 1024 ne atoms
d. 25 xe atoms
a. 55.0 g of ti = 0.02 moles
b. 16.9 mg of na = 0.62 moles
c. 7.95 x 1024 ne atoms = 0.4 moles
d. 25 xe atoms = 0.0037 moles
What is mole?In chemistry, the term "mole" (sometimes written "mole") refers to a standard scientific unit for measuring vast amounts of extremely small objects like atoms, molecules, or other specific particles.
The mole represents 6.02214076 × 10^23 units, an astronomically huge number. With effect from May 20, 2019, the International System of Units (SI) adopted this number as the mole definition by the General Conference on Weights and Measures.
The number of atoms found in 12 grams of carbon-12, as established scientifically, made up the definition of the mole in the past. The quantity of units in a mole is also known as Avogadro's number or Avogadro's constant in honor of the Italian physicist Amedeo Avogadro (1776–1856).
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A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.01 atm and a volume of 12.5 l to a final volume of 29.3 l. (a) what is the final pressure of the gas?
By ideal gas approximation, the final pressure is 2.14 atm.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
V1 = 12.5 L
V2 = 29.3 L
P1 = 5.01 atm
When the initial and final temperature is the same, we can use the ratio of pressure and volume as
P1 . V1 = P2 . V2
5.01 . 12.5 = P2 . 29.3
P2 = 2.14 atm
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claudia performed a flame test in her lab. the result of her flame test is shown here. what scientific questions could claudia ask about the flame? check all that apply. what element causes this flame color? is this the prettiest flame color? will the flame color change if another element is added? will changing the temperature affect the flame color? which flame test does the class like the best?
The scientific questions Claudia can ask about the flame test are (A), (C), and, (D).
The flame test is used to find sure factors, which on heating deliver a particular colour to the flame.
clinical questions are extraordinary from regular questions as they've a prior goal and need to be testable.
a very good scientific question is absolutely reality-primarily based and may be answered through experiment or using previous evidence.
three principal kinds of clinical questions are Verification questions, size, or statement-based totally facts series, which include specific capabilities of an organism or phenomenon.
The clinical questions Claudia ask is-
What detail reasons this flame shade?Will the flame coloration exchange if some other detail is added?Will converting the temperature have an effect on the flame coloration?To learn more about the flame test and scientific question, visit: https://brainly.com/question/17752552
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Write a balanced chemical equation for the standard formation reaction of solid calcium hydroxide caoh2
The balanced chemical equation for the standard formation reaction of solid calcium hydroxide CaOH2 is:
Ca + O2 + H2 → Ca(OH)2
The reactant components that are required in the standard states are calcium(Ca), Oxygen(O2), and hydrogen(H2). Oxygen and hydrogen are in their gaseous form and calcium is in solid state.
All of these reactants react to form Ca(OH)2 which is also known as slaked lime.
Ca + O2 + H2 → Ca(OH)2
This chemical equation is balanced because there are 1 Ca, 2 Oxygen atoms and 2 Hydrogen atoms on either sides.
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How many ml of a 5m solution of sodium borate must be added to a 200 ml solution of 50mm boric acid in order for the ph to be 9.6?
19 ml of a 5m solution of sodium borate must be added to a 200 ml solution of 50mm boric acid in order for the ph to be 9.6
Here pH=Pka-log[A]/[B]
= 9.6=9.24-log[A]/[B]
= log[A]/[B]=-0.36
Here for ml molarity formula is used
Molarity=mass/volume here mass of sodium borate is 381g/mol and volume of solution is 200ml
mass/volume=381/200=1.905/5.0×50=19ml
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Hydrolysis of which covalent bonds in atp releases a considerable amount of energy?
There is a significant quantity of energy released during the hydrolysis of the covalent bonds in ATP.
Phosphate-phosphate bond hydrolysis occurs during the breakdown of an ATP molecule, which releases a significant amount of energy.
How is ATP hydrolysis defined?
Adenosine triphosphate (ATP) contains highly energetic phosphoanhydride bonds that, when broken, such as occurs in muscles, release chemical energy through a catabolic reaction process called ATP hydrolysis.Nitrogen-carbon double bonds, phosphate-phosphate bonds, carbon-hydrogen bonds, and hydrogen bonds are all found in an ATP molecule.
Phosphate-phosphate bond hydrolysis occurs during the breakdown of an ATP molecule, which releases a significant amount of energy.
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If you separated a gypsum stone cast from an alginate impression beyond the optimum time interval, you could expect the cast to be?
The 12-hour time of contact between alginate and therefore the plaster cast is not recommended because it influences the quality of the plaster cast
What is gypsum cast?Gypsum may be a resource that is found by doing a variety of activities. Gypsum are often crafted into Gypsum Orbs, which may then be turned into special caches is called Gypsum Casts. Gypsum Casts are gear type specific, and when opened, guarantee an Expertise bump for that sort of gear as well as an item of that type.
Is gypsum utilized in cast?Gypsum products are one among the most broadly utilized dental materials for fabrication of dental casts and dies which are used as for further construction of indirect dental restorations
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This diagram
shows a hydrogen atom. Explain why it looks
like it does.
4
Answer:
a diagram of hydrogen has 1 proton with charge (+1) inside it's nucleus and no neutrons
also it has 1 electron with charge (-1) outside the nucleus in orbit
Explanation:
HELP, as much as i try to understand i cant
The table is based on the periodic table and is to be filled by finding out various elements of periodic table
Disclaimer:
The table given below is not clear and hence only general idea can be provided
The table is based on the idea of periodic table where various constituents such as mass number, overall charge , total particles, number of protons have been asked to be labelled.
Sodium has been solved as an example and various postulates of Cu is being provided to solve accordingly
In the constituents of element Cu
Name- Cuprous and Cupric
Atomic number-29
Mass number-63
overall charge-+2 for Cuprous and +3 for Cupric
Total particles in nucleus-63
number of protons -29
number of neutrons-34
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Determine the limiting reactant and calculate the number of grams of sulfur dioxide, so2, that can be formed when 27.3 g of methane thiol, ch3sh, reacts with 38.6 g of oxygen, o2.
When Methane thiol, CH₃SH, reacts with O₂, 25.8 grams of Sulfur dioxide, SO₂ is formed and limiting reactant is Oxygen, O₂.
The balanced chemical reaction is:
CH₃SH(g) + 3 O₂(g) → 2 H₂O(g) + CO₂(g) + SO₂(g)
Molecular weights: Actual/given mass:
CH₃SH = 48.11 g/mol 27.3 g
O₂ = 32.01 g/mol 38.6 g
H₂O = 18.01 g/mol
CO₂ = 44.01 g/mol
SO₂ = 64.06 g/mol
Number of moles = Given mass
Molecular mass
So,
moles of methane thiol = 27.3 ÷ 48.11= 0.56 moles
moles of oxygen = 32.01÷38.6 = 0.82 moles
From the reaction,
1 mole of CH₃SH reacts with 3 moles of O₂ to give 1 mole of SO₂
Thus, 0.56 moles of CH₃SH reacts to form 1 × 0.56 = 0.56 moles of SO₂
Mass of SO₂ produced is 0.56 × 64.06 g = 35.86 g
moles of SO₂ = 35.86 ÷ 64.06 = 0.55 moles
So,
The molecules in a sample of solid so2 are attracted to each other by a combination of?
The molecules in a sample of solid so2 are attracted to each other by a combination of London forces and dipole-dipole interactions.
What are London forces?Other names for London dispersion forces include dispersion forces, London forces, fluctuation induced dipole bonds, instantaneous dipole-induced dipole forces, and weakly van der Waals forces. Since the electrons are often arranged symmetrically with regard to the nucleus, they serve as a form of electrically symmetric force between atoms and molecules.
What are dipole dipole interactions?Dipole-dipole interactions, which result from the close association of induced or permanent dipoles, are weak interactions. Van der Waals interactions are the name given to these forces taken as a whole. These interactions are widespread in proteins and range widely in strength.
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Ionic bonds are ___________ than covalent bonds and are ___________ common in cells.
Answer:
Ionic bonds are stronger than covalent bonds
John needs 6 m of wood to build a diving board. The wood comes in different size packages. Select all the packages John could buy that would meet his needs?
3 pieces at 2000 mm each
4 pieces at 1.5 cm each
6 pieces at 100 mm each
6 pieces at 100 cm each
8 pieces at 200 mm each
On calculating using conversions, John can select either the package of wood with (a) 3 pieces of 2000mm each or the one with (d) 6 pieces of 100cm each.
On conversion of units from mm and cm to m:
1m = 100cm
1m = 1000mm
Therefore,
Since John requires 6m of wood to build a diving board, using unit conversions:
3 pieces of 2000mm each:
2000mm = 2m = 2m x 3 = 6m
4 pieces of 1.5 cm each:
1.5cm = 0.015m x 4 = 0.06m
6 pieces of 100 mm each:
100mm = 0.1m x 6 = 0.6m
6 pieces of 100 cm each:
100cm = 1m x 6 = 6m
8 pieces of 200 mm each:
200mm = 0.2m x 8 = 1.6m
Result:
The package with 3 pieces wood of 2000mm each equals to 6m of wood.
Similarly, the package with 6 pieces wood of 100cm each equals to 6m of wood.
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A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0°c, the volume of the gas is 371 ml. To what temperature must the gas be heated to occupy a volume of 557 ml? report your answer in degrees celcius to the nearest whole number.
The gas must be heated to a final temperature of 137°C in order to fill a volume of 557 ml.
Given,V₁= 371mlV₂ = 557 mlT₁ = 0°C or 273 K
The final gas temperature that has to be heated must be determined.
As long as the cylinder is free to move, the pressure is always 1 atm, or equal to the external pressure.
Consequently, by using Charles Law, we obtain
V₁ / T₁ = V₂ / T₂
where starting and ultimate volumes V1 and V2, respectively T1 and T2 are beginning and ultimate temperatures, respectively (in Kelvin).
The ultimate temperature is as a result
T₂ = V₂ × T₁ / V₁Or, T₂ = 557 x (0+273) / 371Or, T₂ = 410 KOr, T₂ = 137°C.
As a result, the temperature is 137°C at the end.
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Acteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is:______
Bacteria and archaea fix nitrogen (n2) by reducing it to ammonia (nh3), the form of nitrogen assimilated by plants. the main reservoir of nitrogen is is the atmosphere.
The transformation of atmospheric Nitrogen N[tex]_{2}[/tex] into ammonia NH[tex]_{3}[/tex] which is a form that plants may use, is known as biological nitrogen fixation. However, eukaryotes do not engage in the process; it is exclusive to bacteria and archaea.
It has long been recognized that some archaea can contribute to the nitrogen cycling processes (albeit some of these organisms were not initially recognized as archaea). These included both assimilatory and dissimilatory activities, such as the fixing of atmospheric nitrogen. However, rather than large terrestrial or aquatic environments, these reactions were linked to extremophilic archaea that are generally found in 'exotic' habitats like hot springs or salt-saturated lakes.
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Benny pushes a 20 kg crate from rest. If the crate accelerates at a rate of 3 m/s2, what is the amount of force applied for it to move?
Answer:
60 N.
Explanation:
The force formula of acting on an object is F=ma.
This means that...
F= force
M - mass
A = acceleration
So to solve this you have to solve for F.
F=ma
F=(20kg)(3m/s^2)
F= 60 N.
I hope this helps, have a good day! :D
Which observation most likely indicates that only a chemical change has taken place?(1 point)
The change cannot be reversed.
The shape changes
States of matter changes.
A reaction occurs.
The observation most likely indicates that only a chemical change has taken place the change cannot be reversed.
What is a Chemical change?
A chemical change is a change of one substance into another, the formation of new compounds with different properties, or any combination of these. It happens when two compounds mix to create a new material (synthesis or decomposition to form more substances).Burning, rusting, rotting, and frying are a few instances of chemical change. Boiling, melting, freezing, and shredding are a few examples of physical changes.When bonds between molecules or atoms are formed, disrupted, or both, chemical changes result. This implies that material is changed from one with a certain set of attributes (such as melting point, color, flavor, etc.) into another with a different set of properties.Hence, The observation indicates chemical change is the change that cannot be reversed.
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Crack is made by taking powdered cocaine hydrochloride and adding sodium bicarbonate and water. True or false
At 80. 0°c and 12. 0 torr, the density of camphor vapor is 0. 0829 g/l. What is the molar mass of camphor? report your answer in grams per mole to the nearest whole number.
The molar mass of camphor in the nearest whole number is 152 g/mol.
Given,
P = 12 torr or 0.01579 atm
1 atm = 760 torr
Density = 0.0829 g/l
R = 0.0821 L.atm/mol.K
T = 273° K + 80° K
T = 353° K
As we know,
PV = nRT
Or, PV = mass × R × T / molar mass
Or, P = mass × R × T / volume × molar mass
Where, mass/ volume = density (d)
P = dRT / molar mass
Now putting the values,
0.01579 = 0.0829 × 0.0821 × 353 / molar mass
Or, molar mass = 152.156 g/mol.
Hence, the molar mass of camphor is 152 g/mol.
The molar mass of a chemical compound is defined because the mass of a pattern of that compound divided by way of the quantity of substance that's the variety of moles in that pattern, measured in moles. The molar mass is a bulk, not molecular, assets of a substance. The molar mass is a mean of many instances of the compound, which regularly vary in mass because of the presence of isotopes. most commonly, the molar mass is computed from the usual atomic weights and is as a result a terrestrial average and a characteristic of the relative abundance of the isotopes of the constituent atoms on the planet. The molar mass is appropriate for converting between the mass of a substance and the amount of a substance for bulk portions.To learn more about molar mass, visit: https://brainly.com/question/16377069
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The density of benzene at 15 °c is 0. 8787 g/ml. Calculate the mass of 0. 1500 l of benzene at this temperature. Enter your answer in terms of grams, but do not include units in the blank.
Using benzene density, the mass of benzene is 131.805 grams.
We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as
ρ = m / V
where ρ is density, m is mass and V is volume
From the question above, we know that
ρ = 0.8787 g/mL
V = 0.15 L = 150 mL
By substituting the following parameters, we get
ρ = m / V
0.8787 = m / 150
m = 0.8787 . 150
m = 131.805 grams
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Matter is a substance that has ________.
Answer:
matter is substance that has mass.
Answer: Mass and Volume?
Explanation:
A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol. What is its molecular formula?.
The molecular formula of a molecule that has an empirical formula of ch and its molar mass is known to be 26 g/mol is C₂H₂
What is the molecular formula?The molecular formula of a compound is the total number of atoms present in a molecule of the compound.
The empirical formula of the molecule is the simplest whole number of atoms of a compound.
The empirical formula of the molecule is ch
The molar mass is 26 g/mol
So, the molecular formula will be C₂H₂ and the compound is acetylene. It is a hydrocarbon.
Thus, the molecular formula of the molecule is C₂H₂.
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What is the mass percent of an ammonium carbonate solution prepared by dissolving of solid into of water?
the mass percent is 45.67%
The mass percentage of a solution is calculated as the solute concentration in grams per 100 g of the solution.
Given that 39.5 g of water dissolves 33.2 g of ammonium carbonate.
∴
Mass of the solution is (33.2+39.5) g = 72.7 g
So, the solution of 72.7 g includes 33.2 g of ammonium carbonate.
So 100 g solution contains
33.2/72.7×100≈45.67 g ammonium carbonate
Thus the mass percentage of the solution is 45.67%
One approach to show the concentration of an element in a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total mass of the combination by the mass of each component and multiplying the result by 100%.
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Suppose a graduated cylinder were not correctly calibrated. how would this affect the results of a measurement? how would it affect the results of a calculation using this measurement?
The volume measurements won't be accurate and will be either less than or more than the anticipated figure if the graduated cylinder is accurately calibrated (depending on if the error in calibration is higher or lower). Depending on the calibration error, the calculated value may be higher or lower than the real value.
What is calibration?
Setting up an instrument so that it can generate findings for samples that fall within a tolerable range is part of the calibration process. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.
Calibration attempts to reduce any measurement uncertainty by confirming the precision of test apparatus. In measuring procedures, calibration quantifies and reduces mistakes or uncertainties to a manageable level.
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Determine the number of m in 1600 mm.
Answer:
1600 mm to m = 1.6 meters
Explanation:
