Answers
Hope you could understand.
If you have any query, feel free to ask.
Related Questions
how can you apply your important learning political analyzing the phenomenon
Answers
Answer:
dont listen to the mainstream media since 50% is ran by the jews and they tend to be lying and deceiving people
Explanation:
An unknown substance has a mass of 680g and a volume of 1000. What is the identity of the substance
Answers
The density of an object is its mass divided by volume. The mass of a the substance is given 680 g with a volume of 1000 ml. Then the density of the object is 0.68 g/ml.
What is density ?Density of substance is the measure of its mass per unit volume. It describes how closely its particles are packed. Density depends on the bond type, temperature and pressure.
Volume of the object is the space occupied by its particles. Volume can be expressed in L, ml, cm³, dm³ etc. Only solids and liquids has a definite volume and the volume of gases is that of the container.
Give that, volume of the substance = 1000 ml
Mass = 680 g
density = mass/volume
= 680g/ 1000 ml
= 0.68 g/ml.
Therefore, the density of the substance is 0.68 g/ml The substance which have 068 g/ml density is gasoline.
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What else should the second group of researchers measure to test the hypothesis
Answers
Answer:
Testing of thesis testing is used to determine the plausibility of a thesis.
The test assess the plausibility of the thesis of a sample data.
It occurs through different way, the first step is used to test the state the two suppositions.
In the coming step evaluation of data, third step include carry out plan and dissect the data.
The final step is to dissect the results of the data, it can moreover accept the thesis and reject the null thesis.
Learn further about thesis, then
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what is the name given to the group in box? + explain please
Answers
The name given to the group delimited in the image is ethyl.
What is ethyl?It is a hydrocarbon from the alkyl functional group.
Ethyl is a substituent derived from ethane. The formula for ethane is \(C_2H_6\), whereas, ethyl has one H less than ethane.
Thus, the formula for ethyl is \(C_2H_5\).
Looking at the delimited portion of the image, 2 C atoms in C-C bond are bonded by 5 H atoms.
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what charge does copper have?
Answers
Answer: 1+charge
Explanation: hoped this helped:)
11. The pH values of some solutions are given below pH 14.0 1.0 L 8.0 N 6.5 n P 7.0 Solution M Z (a) Identify the solution with the lowest concentration of hydrogen ion. Give reason for your (1mk) answer
Answers
Answer: 14.0
Explanation: 14.0 is a base. The more basic, the less hydrogen ion concentration.
How many moles of nitrogen gas is 40.0 g?
Answers
Answer:
1.43 moles N₂
Explanation:
To determine the moles of nitrogen gas (N₂), you need to multiply the given value by the molar mass. The molar mass is a ratio comparing the mass (g) of nitrogen gas per 1 mole. It is important to arrange this ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 3 sig figs to match the given value.
Molar Mass (N₂): 2(14.007 g/mol)
Molar Mass (N₂): 28.014 g/mol
40.0 grams N₂ 1 mole
------------------------- x ------------------------ = 1.43 moles N₂
28.014 grams
why we breath in oxygen but not nitrogen which is having big percentage
Answers
Answer:
Breathing an atmosphere of pure oxygen would damage the delicate tissues and blood vessels in our lungs, so it's a good thing that most of our atmosphere is nitrogen.Nitrogen is a fairly inert chemical (it does react, but not nearly as much as oxygen - this is why it is fairly stable in the atmosphere, whereas oxygen has to constantly be regenerated by photosynthesis).
Hope it Helps :))
3.
(08.04 LC)
Which of the following is a base? (3 points)
AgO
Ca(OH)2
HF
NaCl
Answers
The compound that is a base from the given list is Ca(OH)2. Option 2.
What is a base?
A base is a chemical substance that produces hydroxyl ions as the only negative ion in aqueous solutions.
Ca(OH)2 is calcium hydroxide, which is a chemical compound consisting of one calcium ion (Ca2+) and two hydroxide ions (OH-).
It is classified as a base because, when it dissolves in water, it produces hydroxide ions that can accept protons (H+) from acids in a process known as a neutralization reaction.
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Question 2 of 10
What is the percent yield of a reaction?
The amount of product obtained x 100
amount possible
B. The amount of product actually obtained in a reaction
C. The amount of product that is possible from a reaction
D. The difference between measured and calculated amounts
A.
Answers
Answer:
c
Explanation:
Pls help! Will mark brainliest! 55 Points!
Answers
Answer:
7cm square is the answer
Hope it's helpful
The outer ______ are the parts of an atom that are involved in chemical reactions. A. electrons and protons B. electrons C. protons and neutrons D. protons
Answers
The answer is B Electrons
1. How many ATOMS of carbon are present in 7.48 grams of carbon monoxide ?
Answers
Answer:
The answer is 1.61 × 10²³ atoms
Explanation:
To determine number of atoms, we will use the formula below
Number of atoms = number of moles (n) × avogadro's constant (6.02 x 10²³)
n was not provided, hence we will solve for n
n = mass/ molar mass
molar mass of carbon monoxide, CO (where C is 12 and O is 16) is 12 + 16 = 28
mass was provided in the question as 7.48
n = 7.48/28
n = 0.267
Hence,
number of atoms = 0.267 × 6.02 x 10²³
= 1.61 × 10²³ atoms
How many moles of sucrose are dissolved in 500 ml of a 1.5 M sucrose solution?
A. 0.75 moles
B. 750 moles
C. 0.003 moles
D. 333 moles
Answers
5. A grouping of organisms based on shared characteristics is called
A. binomial nomenclature
B. scientific name
C. classification
D. genus
Answers
Answer:
peace of vassals
Explanation:
I think i spelled it worng
Chlorophyll is found in
A. neither plant
nor animal cells.
B. animal cells.
C. plant cells.
D. plant and animal cells.
Answers
Answer:
Only plant cells
Explanation:
This organelle helps plants photosynthesize. Humans do not do that.
The enthalpy change for a process is equal to the heat exchanged between system and surroundings under which of the following conditions? a. Constant volume. b. P = Pext = constant (whetre P and Pext are, respectively, the pressure inside and the pressure outside the system) C. Constant temperature d. Reversible expansion e. Expansion at a constant pressure followed by a reversible compression to the original volume.
Answers
Under condition (b), where P=Pext=constant (where P and Pext are, respectively, the pressure inside and outside the system), the enthalpy change for a process is equal to the heat exchanged between the system and surroundings.
What is constant volume in chemistry?In a constant volume calorimeter, the system is sealed or isolated from its surroundings, which accounts for why its volume is fixed and there is no volume-pressure work done. An isochoric process is another name for a constant volume process. An illustration would be the addition of heat to a gas in a container with fixed walls. The gas cannot function because the walls cannot be moved: W = 0.
Is gas a constant volume?He discovered that under constant temperature, the relationship between a gas's pressure and volume is inverse. Boyle's law, which first established in 1662, asserts that the volume and pressure of an ideal gas of a given mass in a closed system are always constant at constant temperature.
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Calculate the Kelvin temperature to which 21.0 L of a gas at 34°C would have to be heated to change the volume to 41.0 L. The pressure and number of particles remain constant.
Answers
In order to convert the volume from 21.0 L to 41.0 L while maintaining the same pressure and particle number, the gas would need to be heated to a temperature of 580.49 K.
When the amount of moles and pressure are both constant?According to Boyle's law, the pressure and volume of a gas follow an inverse relationship when the gas's temperature and molecular composition are both constant.
This problem can be solved using the coupled gas law, which connects a gas's pressure, volume, and temperature:
(P1 V1) / T1 = (P2 V2) / T2
In this problem, we are given P1 = P2, V1 = 21.0 L, V2 = 41.0 L, and T1 = 34°C. We want to find T2 in Kelvin.
First, we need to convert T1 from Celsius to Kelvin:
T1 = 34°C + 273.15
T1 = 307.15 K
Next, we can rearrange the combined gas law to solve for T2:
T2 = (P2 V2 T1) / (P1 V1)
Substituting the given values, we get:
T2 = (1 atm * 41.0 L * 307.15 K) / (1 atm * 21.0 L)
T2 = 580.49 K
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Write the chemical symbols for three different atoms or atomic anions with 23 electrons.
Answers
Krypton, Chromium, and Oxygen with the following symbols Kr-13, Cr-2, and O-15 respectively have 23 electrons.
The atomic number of an atom determines the number of electrons it has. When the number of protons is equivalent to the number of electrons, the atom is electrically neutral. An anion, on the other hand, is an atom with a negative charge. It has gained an electron or two, or even more. Below are the chemical symbols for three different atoms or atomic anions with 23 electrons.Krypton:Kr has an atomic number of 36, indicating that it has 36 electrons. However, if we add 13 electrons to it, the total number of electrons becomes 49. Krypton with 13 additional electrons becomes Kr-13, with a total of 49 electrons.Chromium:Cr has an atomic number of 24, indicating that it has 24 electrons. Adding two more electrons to it, the total number of electrons becomes 26. The atomic anion with 26 electrons is Cr-2.Oxygen:Oxygen has an atomic number of 8, indicating that it has 8 electrons. However, if we add 15 electrons to it, the total number of electrons becomes 23. Oxygen with 15 additional electrons becomes O-15, with a total of 23 electrons.
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For each of the pictures below, decide what element it comes from and circle atom or
ion Then write the chemical symbol and the charge if any.
Answers
Answer:
#1 Atom
Oxygen
Charge neutral atom
#2 ion
Oxide ( oxygen anion)
Charge 2-
Formula O2-
#3 Atom
Flourine
Neutral atom no charge
#4 atom
Flourine
Neutral atom no charge
#5 ion
Sulphide
Charge 2-
S2-
#6 ion
Chloride Cl-
Charge -1
#7 atom
Chlorine
No Charge neutral
#8 ion
Calcium ion cation
Charge 2+
Ca++
#9 atom
Hydrogen (protium)
No charge neutral
#10 atom
Hydrogen (deutrium)
No charge neutral
#11 ion
Proton H+
Charge +1
#12 atom
Helium
No charge neutral atom
Explanation:
To find charge we need difference in proton and electron if proton are equal to electron then this is neutral atom
If electron are more this is negative charge ion
For example in oxygen 8 proton and 10 electron its charge is negative 2
If proton are more this is positive charge ion
For example in calcium 20 proton and 18 electron positive ion is formed.
According to the picture, the name of each element along with its charge and chemical symbol is as follows:
Picture 1 represents an oxygen atom that is neutrally charged. Picture 2 represents an oxide ion (oxygen anion), formula \(O^2^-\). Picture 3 represents a fluorine atom that is a neutrally charged atom.Picture 4 also represents a fluorine atom that is a neutrally charged atom.Picture 5 represents a sulfide ion with the charge of \(2^-\). Picture 6 represents a chloride ion with a charge of -1. Cl-Picture 7 represents a chlorine atom with a neutral charge. ClPicture 8 represents a calcium ion with the charge of +2 (cation).Picture 9 represents a neutral hydrogen atom (protium).Picture 10 represents a neutral hydrogen atom (deuterium).Picture 11 represents a hydrogen ion with a charge of +1. Picture 12 represents a neutrally charged helium atom. (He)What is a chemical element?A chemical element may be defined as the characteristics of atoms that possess a given number of protons in their nuclei, along with the number of neutrons including the pure substance typically consisting only of that species.
Therefore, according to the picture, the name of each element along with its charge and chemical symbol is well mentioned above.
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Pls help I’ll brainlest and add extra points
Answers
Answer:
a top predator, fighting
Calculate the volume that a 0.75 mol sample of gas will occupy at 295k and a pressure of 1.5 atm
Answers
The volume occupied by the 0.75 mole of the gas at 295 K and a pressure of 1.5 atm is 12.11 L
How do i determine the volume occupied by the gas?From the question given above, the following data were obtained:
Number of mole of gas (n) = 0.75 moleTemperature of gas (T) = 295 KPressure of gas (P) = 1.5 atmGas constant (R) = 0.0821 atm.L/molKVolume of occupied by gas (V) =?Ideal gas equation is written as shown below:
PV = nRT
When we input the given parameters, the volume occupied is obatined as:
1.5 × V = 0.75 × 0.0821 × 295
Divide both sides by 4.31
V = (0.75 × 0.0821 × 295) / 1.5
V = 12.11 L
Thus, from the above calculation, we can say that the volume occupied by the gas is 12.11 L
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ways of expressing a solution
Answers
Answer:
There are several ways of expressing the concentration of a solution.
Explanation:
Concentration is the proportion of a substance in a mixture. There are several ways of expressing them, each with their own usefulness. What's incredibly useful is with a little math and conversion factors, these can all be interconverted.
Molarity (M) - amount (mol) of solute / volume (L) of solutionPros: Very common in labs, makes conversions easy. Cons: Effected by temperature (liquid expands with heat so unit volume of hot solution has less solute than cold solution) and mixing (volumes are not always additive (for instance, 50 mL of water and 50 mL of ethanol is not exactly 100 mL of mixture due to solvent-solvent interactions).Molality (m) - amount (mol) of solute / mass (kg) of solventPros: Preferred when temperature and density could change; molal is based on masses, not volume so molality does not change with temperature. Masses, unlike volumes sometimes, are always additive.Cons: When dealing with moles in reactions conversions are harder.Parts by mass a.k.a mass % (% w/w) - mass of solute / mass of solutionPros: Good indication of how pure a substance is; and good for very small concentrations such as toxin or pollutant levels in a biological or environmental setting, respectively.Cons: Not the most useful for reaction stoichiometry.Parts by volume a.k.a volume % (%v/v) - volume of solute / volume of solutionPros: Very good and common for measuring main ingredients in things, such as alcohol in hand sanitizer, hydrogen peroxide in those brown bottles you see, and how much alcohol in wine bottles.Cons: Again, not the easiest to use for reaction stoichiometry.Mole fraction (X) - amount (mol) of solute/ amount (mol) of solute + amount (mol) of solvent Pros: N/ACons: N/AMass per volume percentage - mass of solute / volume of solutionPros: Common for measuring main ingredients in medicine, such as how much of it is in an aqueous solution (example: benzocaine)Cons: Difficult to use with stoichiometry.Parts per million and parts per billion (ppm or ppb) - mass of substance / mass of sample * 10^6 or 10^9Pros: Excellent for expressing concentrations of very trace components such as a toxin or pollutant in blood, for example. Cons: Not very useful for large quantities of things.Note: to find the percent of some of these, such as for mass percent or volume percent, multiply the result by 100.
Additionally, with some practice you can answer a question such as, "The label on a 0.750-L bottle of Italian chianti says "11.5% alcohol by volume." How many liters of alcohol does the wine contain?". etc...
I really hope this helps! Take care.
If NaCl has a mass of 3.2g, what is the volume of chlorine gas at STP?
Answers
Hey there!
Molar mass NaCl = 58.44 g/mol
58.44 g ----------------- 22.4 ( at STP )
3.2 g -------------------- Volume ??
Volume = ( 3.2 x 22.4 ) / 58.44
Volume = 71.68 / 58.44
Volume = 1.226 L
Hope this helps!
Answer:
V = 0.56 L
Explanation:
Given data:
Mass of NaCl = 3.2 g
Volume of chlorine gas = ?
Pressure and temperature = standard
Solution:
Chemical equation:
2NaCl → 2Na + Cl₂
Number of moles of NaCl:
Number of moles = mass/molar mass
Number of moles = 3.2 g/ 58.44 g/mol
Number of moles = 0.05 mol
Now we will compare the moles of NaCl with chlorine;
NaCl : Cl₂
2 : 1
0.05 : 1/2×0.05 = 0.025 mol
Volume of chlorine:
PV = nRT
V = nRT/P
V = 0.025 mol × 0.0821 atm.L/mol.K × 273 K / 1 atm
V = 0.56 L
Mole Practice
1. How many particles of gold are in 2.3 moles of Au?
2. Calculate the number of moles of O2 in 15.5 grams of O2. (MM O2 = 32 g/mol)
3. Calculate the mass in grams of 2.47 x 1021 formula units of sodium oxide.
(MM Na₂O = 62 g/mol)
X
4. Calculate the number of atoms of titanium in 23.4 Kg Ti. (MM Ti = 48 g/mol)
2 H₂ + O₂ -> 2 H₂O
5. How many grams of O₂ are needed to produce 75.0 grams of H₂O? (MM O₂ = 32 g/mol)
(MM H₂O = 18 g/mol)
6. How many grams of H₂ are needed to react with 75.0 grams of O₂? (MM H₂ = = 2 g/mol)
(MM O₂ = 32 g/mol)
Answers
The number of particles of gold that are in 2.3 moles of Au is 1.38 * 10²⁴ particles.
The number of moles of O₂ in 15.5 grams of O₂ is 0.48 moles
The mass in grams of 2.47 x 10²¹ formula units of sodium oxide is 0.254 grams
The number of atoms of titanium in 23.4 Kg Ti is 2.93 * 10²⁶ atoms
The mass in grams of O₂ needed to produce 75.0 grams of H₂O is 66.67 grams of O₂
The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ is 9.375 g.
What is the number of particles in a mole of a substance?The number of particles in a mole of a substance is 6.02 * 10²³.
Considering the given questions:
The number of particles of gold that are in 2.3 moles of Au = 2.3 * 6.02 * 10²³
The number of particles = 1.38 * 10²⁴ particles.
The number of moles of O₂ in 15.5 grams of O₂ = 15.5/32
The number of moles of O₂ = 0.48 moles
The mass in grams of 2.47 x 10²¹ formula units of sodium oxide = 2.47 x 10²¹/ 6.02 * 10²³ * 62 g
The mass in grams of 2.47 x 10²¹ formula units of sodium oxide = 0.254 grams
The number of atoms of titanium in 23.4 Kg Ti = 6.02 * 10²³ * 23.4 * 1000/48
The number of atoms of titanium in 23.4 Kg Ti = 2.93 * 10²⁶ atoms
The mass in grams of O₂ needed to produce 75.0 grams of H₂O = 75/18 * 1/2 * 32
The mass in grams of O₂ needed to produce 75.0 grams of H₂O = 66.67 grams of O₂
The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ = 75/32 * 2 * 2 g
The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ = 9.375 g.
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What is the molar mass of CH2O2 ? ( C= 12.01 g/mol, H=1.008 g/mol, O=16.00)
Answers
Answer:
Molar Mass of CH2O2 is 46.026
Explanation:
What is the molar mass of CH2O2 ? ( C= 12.01 g/mol, H=1.008 g/mol, O=16.00)
C = 12.01g/mol
H = 1.008g/mol
O = 16g/mol
CH2O2 = 12.01+1.008x2+16x2 = 46.026g/mole
is microorganisms bigger or particles bigger
Answers
Answer:
particles bigger
Explanation:
Even when compared with animal cells, microorganisms become smaller. They are about 1/10 the size of a typical human cell. Therefore, compared with human-sized animal cells, the size of bacteria (such as bacterial cells) will be the size of a cat or puppy. The size of the virus is about 1/10 of that of other microorganisms such as bacteria.
Hope it helps. If not, I'm so sorry.
Answer:
particles are bigger than microorganism
3.88g of NaOH is required to neutralize a spill of hydrochloric acid. A 0.516M solution of NaOH is available for use.
A. Determine the number of moles needed to complete the reaction.
B. What volume of NaOH solution is needed for this reaction?
C. What volume of a stock 1,15M solution would be used to make the solution used in the reaction?
Answers
Answer:
ftb
Explanation:
How can hypotheses best be tested?
O by asking questions
O through experimentation
O by forming an opinion
O through technology
Answers
Answer:
the second option
Explanation
Q)Indicate True and False statements:
a. The melting points of saturated fatty acids increase with increasing chain length
b. Double bonds in saturated fatty acids are separated by -CH2-CH2-groups
c. △9, 12-all cis, 18:3 is linoleic acid
d. A by-product of the hydrolysis of fats is glycerol
Answers
Statement a is true, as the melting points of saturated fatty acids do increase with increasing chain length. Statement b is false, as saturated fatty acids do not contain double bonds. Statement c is false, as △9, 12-all cis, 18:3 represents alpha-linolenic acid, not linoleic acid. Statement d is true, as glycerol is indeed a by-product of the hydrolysis of fats.
a. True. The melting points of saturated fatty acids increase with increasing chain length. This is because longer fatty acid chains have stronger intermolecular forces, such as van der Waals forces, which require more energy to break and result in higher melting points.
b. False. Saturated fatty acids do not have double bonds. They are composed of only single carbon-carbon bonds. Double bonds are found in unsaturated fatty acids.
c. False. △9, 12-all cis, 18:3 is not linoleic acid. It represents the structure of alpha-linolenic acid. Linoleic acid is △9, 12-18:2, which means it has two double bonds located at the 9th and 12th carbon positions.
d. True. A by-product of the hydrolysis of fats is glycerol. When fats undergo hydrolysis, they are broken down into their constituent fatty acids and glycerol. Glycerol is a three-carbon molecule that is a component of triglycerides (fats).
During hydrolysis, the ester bonds between the fatty acids and glycerol are cleaved, resulting in the release of fatty acids and glycerol.
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