Answer:
tetrahedral geometry
CHCH2O- CH2CH3Explanation:
There are several centers of interest. Each carbon with all single bonds is the center of a tetrahedral geometry.
explain why vendors keep 'dry ice' in their ice cream boxes
Vendors keep 'dry ice' in their ice cream boxes in order to prevent melting of dry ice.
Why vendors keep 'dry ice' in their ice cream boxes?Dry ice melts if it is placed in the open space because the carbondioxide gas is compressed with pressure. As carbon dioxide changes to gas, it escape to the atmosphere. If you use an airtight container such as ice cream box, the gas cannot escape.
So we can conclude that vendors keep 'dry ice' in their ice cream boxes in order to prevent melting of dry ice.
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what are the advantages and disadvantages of rusting
Answer: The rusting of iron is more of a disadvantage than an advantage. Rusting forms an iron oxide which is more brittle than the iron. It less resistance to environmental degradation and permeability by water and air, therefore cannot be used for coating.
Explanation: plzz mark as brainliest
What is the molarity of a solution containing 20moles of NaCl dissolved in 10 liters of water?
10 mol/L
2 mol/L
5mol/L
0.5 mol/L
The molarity of a solution containing 20moles of NaCl dissolved in 10 liters of water is 2 mol/L.
How do we calculate molarity?Molarity of any solution will be calculated by using the below formula:
M = n/V, where
n = moles of solute = 20 mol
V = volume of solution or solvent = 10 L
On putting values on above equation, we get
M = 20 / 10 = 2M
Hence required molarity of NaCl is 2 M.
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(b) the absolute temperature of the gas at which 3.33x103 mol occupies 478 mL at 750 torr,
Explanation:
T=?
Given
n=3.33×10³
V=478mL=4.78L
P=750torr= 0.987 Atm
simply use the formula
PV =nRT
where R is universal gas constant
0.987×4.78= 3.33×10³×8.314×T
T = 0.000170°c
T= 273.15 K!
The absolute temperature of the gas at which 3.33x10³ mol occupies 478 mL at 750 torr is 1.726 × 10-³K
HOW TO CALCULATE TEMPERATURE:
The temperature of a substance can be calculated using the ideal gas law equation as follows:PV = nRT
Where;
P = pressure (atm)V = volume (L)n = number of moles (mol) R = gas law constant (0.0821 molK/Latm)T = temperature (K)According to this question,
P = 750torr = 0.987 atmV = 478mL = 0.478L0.987 × 0.478 = 3.33 × 10³ × 0.0821 × T0.472 = 273.39TT = 0.472 ÷ 273.39T = 1.726 × 10-³KTherefore, the absolute temperature of the gas at which 3.33x10³ mol occupies 478 mL at 750 torr is 1.726 × 10-³KLearn more at: https://brainly.com/question/12124605?referrer=searchResults
What is the percent by mass of water in the hydrate Na2CO3.10H20 (formula mass = 286)?
Calculation: Molar mass of water = 180 % of water = > 180/286*100 = > 62.93%.
Answer: the percent by mass of water in the hydrate Na2CO3.10H20 is 62.93%.
How tightly particles are packed determines what state it takes.
True or False
Answer:
True
Explanation:
tighter the molecules the slower it moves and the harder it gets
solid has very tight particles packed together
gas has its particles spread out
100 POINTS!!!!!!!
The following diagram shows the branching tree for four kingdoms and some of their shared derived characteristics.
A slanting line is shown. There are four lines drawn vertically on this line at equal intervals. There is a black circle between each pair of these vertical lines. Protists, Plants, Fungi, Animals are written on top of each vertical line in order from left to right. Common Cell is written on the left most end of the sloping line. The second black circle has Mostly Multicellular written on it. The first black circle has X written on it.
What shared characteristic can be written at point X? Use complete sentences to explain your answer.
Answer:
The answer could be "Autotrophs that photosynthesis".
Explanation:
At point X, the common characteristic can be written. The common character between protists and plants is autotrophs that photosynthesize which is the characteristic of plant-like protists. Plant-like protists are autotrophs, use carbon dioxide and water to produce glucose by the process of photosynthesis.
22.4 L is the volume of any gas regardless of atmospheric conditions.
O True
O False
what is the method of seperating inmisible liquid
True or False: Having more moles of solute definitely means a higher concentration (molarity) solution
Answer:
True
Explanation:
The statement having more moles of solute definitely means a higher concentration (molarity) solution is true.
What is Molarity?Molarity is used to define concentration of any solution and it will be define as the no. of moles of solute present in per liter of solution and it is represented as:
M = n/V
From the equation it is clear that molarity of is directly proportional to the moles of the solute present in that. So, more no. of moles shows more concentration of solution.
Hence, given statement is true.
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1. Which of these is not a macromolecule? a) Alab) protein c) polysaccharide d) nucleic
acid
Answer:
a) alab
Explanation:
Two of the main macromolecules are proteins and nucleic acid, and a polysaccharide is multiple monomers (monosaccharide) that join to create another macromolecule called carbohydrates.
A transverse wave is observed to be moving along a lengthy rope. Adjacent crests are positioned 2.4 m apart. Exactly six crests are observed to move past a given point along the medium in 9.1 seconds. Determine the frequency of these waves
Answer:
f = 0.65 hz
Explanation:
Given that,
The distance between adjacent crests, wavelength = 2.4 m
6 crests are observed to move past a given point along the medium in 9.1 seconds.
We need to find the frequency of these waves.
We know that,
Frequency = no. of waves per second.
[tex]f=\dfrac{6}{9.1}\ Hz\\\\=0.65\ Hz[/tex]
So, the frequency of these waves is equal to 0.65 Hz.
with recessions government spending should
decrease
increase
or allowed to remain the same increased
Answer:
Increase to pay unemployment and get the economy back up
Consider this statement: Earth is the only source of gravity in the solar system. Do you agree? Give
your reasons.
Answer:
Explanation:
You're kidding, right?
Earth is a puny little planet stuck in the Milky Way which is not a particularly large galaxy that has millions of stars with many times more our gravitational influence.
We are very lucky that the gravitational force is so weak. Were it not, We would be pulled in every direction imaginable and swallowed many times by larger and larger black holes until our existence could never be traced.
We would be like 1 electron in all the atoms of the Universe combined. There's no end to the size and scope of the forces involved if the gravitational force were even a small bit larger than what it is now.
Ochem question?
which of the following would be the best nucleophile in a Methanol?
1. F-
2. NH3
3. CH3S-
4. CH3O-
Answer: 4.) CH3O is the answer, which stands for Methoxide.
Explanation:
1. In apothecaries' measures: 1 scruple = 20 grains, 1 ounce = 480 grains, 1 oz = 28.34 g
What is the mass in micrograms of 5.00 scruples? Remember the known and the
unknown?!
Answer:
5.89 g × 10⁶ μg
Explanation:
Step 1: Convert 5.00 scruples to grains
We will use the conversion factor 1 scruple = 20 grains.
5.00 scruple × 20 grain/1 scruple = 100 grain
Step 2: Convert 100 grains to ounces
We will use the conversion factor 1 oz = 480 grains.
100 grain × 1 oz/480 grain = 0.208 oz
Step 3: Convert 0.208 oz to grams
We will use the conversion factor 1 oz = 28.34 g.
0.208 oz × 28.34 g/1 oz = 5.89 g
Step 4: Convert 5.89 g to micrograms
We will use the conversion factor 1 g = 10⁶ μg.
5.89 g × 10⁶ μg/1 g = 5.89 g × 10⁶ μg
The mass in micrograms of 5 scruples is 5.9×10⁶ μg
We'll begin by converting 5 scruples to grains.
1 scruple = 20 grains
Therefore,
5 scruples = 5 × 20
5 scruples = 100 grains Next, we shall convert 100 grains to grams480 grains = 1 ounce
But
1 ounce = 28.34 g
Thus, we can say that
480 drains = 28.34 g
Therefore,
100 grains = (100 × 28.34) / 480
100 grains = 5.9 grams Finally, we shall convert 5.9 grams to micro grams1 g = 1×10⁶ μg
Therefore,
5.9 g = 5.9 × 1×10⁶ μg
5.9 g = 5.9×10⁶ μgTherefore, 5 scruples is equivalent to 5.9×10⁶ μg
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A piece of Li is
dropped into water
and catches fire
producing LiOH
is a Chemical or physical change
How many milliliters of 0.2560 M KCl solution will contain 20.00 g of KCl?
Answer is 1048 mL solution but how do I get to the answer?
Answer:
1048 mL
Explanation:
Step 1: Given data
Concentration of the solution: 0.2560 MMass of KCl (solute): 20.00 gStep 2: Calculate the moles corresponding to 20.00 g of KCl
The molar mass of KCl is 74.55 g/mol.
20.00 g × 1 mol/74.55 g = 0.2683 mol
Step 3: Calculate the volume of the solution
Molarity is equal to moles of solute divided by liters of solution.
M = moles of solute / volume of solution
volume of solution = moles of solute / M
volume of solution = 0.2683 mol / (0.2560 mol/L)
volume of solution = 1.048 L = 1048 mL
Can somebody please help me!!!
Answer:
javier applied force how this helps
If DG for a reaction equals zero, the reaction
a. is spontaneous.
b. is at equilibrium.
c. may or may not be spontaneous.
d. is not spontaneous.
Answer: If [tex]\Delta G[/tex] for a reaction equals zero, the reaction is at equilibrium.
Explanation:
When a thermodynamic closed system tends to do the maximum amount of non-expansion work then the energy used to do this work is called Gibb's free energy.
The expression for [tex]\Delta G[/tex] can be written as follows.
[tex]\Delta G = \Delta H - T \Delta S[/tex]
where,
[tex]\Delta H[/tex] = enthalpy change
T = temperature
[tex]\Delta S[/tex] = entropy change
This means that [tex]\Delta G[/tex] is the difference between heat released in a process and the amount of heat released in a reversible manner for the same process. So, when the value of of [tex]\Delta G[/tex] comes out to be equal to zero then it means no heat is released or absorbed.
Hence, the reaction is stable or at equilibrium.
Thus, we can conclude that the value of [tex]\Delta G[/tex] = 0 then it means that the reaction is at equilibrium.
Use the word bank below to answer the questions that follow:
chemical
mixture
heat capacity
homogeneous viscosity sublimation
physical property compound chemical formula
substance density
mass
temperature
pressure
heterogeneous
The ratio of the mass of a substance to its volume is called
Answer:
The ratio of the mass of a substance to its volume is called...density.
almunium has a density of 2.70g/cm3. how many moles of aluminium are in a 13.2cm3 block of the metal substances?
Answer:
1.32 moles.
Explanation:
From the question given above, the following data were obtained:
Density of Al = 2.70 g/cm³
Volume of Al = 13.2 cm³
Number of mole of Al =.?
Next, we shall determine the mass of Al.
This can be obtained as follow:
Density of Al = 2.70 g/cm³
Volume of Al = 13.2 cm³
Mass of Al =?
Density = mass / volume
2.7 = mass of Al / 13.2
Cross multiply
Mass of Al = 2.7 × 13.2
Mass of Al = 35.64 g
Finally, we shall determine the number of mole of Al. This can be obtained as follow:
Mass of Al = 35.64 g
Molar mass of Al = 27 g/mol
Number of mole of Al =?
Mole = mass / molar mass
Number of mole of Al = 35.64 / 27
Number of mole of Al = 1.32 moles
Thus, 1.32 moles of aluminum are present in the block of the metal.
HNO3 + Sn + H2O → H2SnO3 + NO
By algebraic method pls
Answer:
3Sn + 4HNO3 + H2O → 3H2SnO3 + 4NO
Please give me the answer please
Answer:
A. 30cm³
Explanation:
Based on the chemical reaction:
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
1 mol of calcium carbonate reacts with 2 moles of HCl to produce 1 mol of CO₂
To solve this question we must convert the mass of each reactant to moles. With the moles we can find limiting reactant and the moles of CO₂ produced. Using PV = nRT we can find the volume of the gas:
Moles CaCO₃ -Molar mass: 100.09g/mol-
1.00g * (1mol / 100.09g) = 9.991x10⁻³ moles
Moles HCl:
50cm³ = 0.0500dm³ * (0.05 mol / dm³) = 2.5x10⁻³ moles
For a complete reaction of 2.5x10⁻³ moles HCl there are necessaries:
2.5x10⁻³ moles HCl * (1mol CaCO₃ / 2mol HCl) = 1.25x10⁻³ moles CaCO₃. As there are 9.991x10⁻³ moles, HCl is limiting reactant.
The moles produced of CO₂ are:
2.5x10⁻³ moles HCl * (1mol CO₂ / 2mol HCl) = 1.25x10⁻³ moles CO₂
Using PV = nRT
Where P is pressure = 1atm assuming STP
V volume in L
n moles = 1.25x10⁻³ moles CO₂
R gas constant = 0.082atmL/molK
T = 273.15K at STP
V = nRT / P
1.25x10⁻³ moles * 0.082atmL/molK*273.15K / 1atm = V
0.028L = V
28cm³ = V
As 28cm³ ≈ 30cm³
Right option is:
A. 30cm³Did you hear the one about a chemist who was reading a book about helium?
Answer: I had that before it's a riddle. Here lemme find it and give you the answer.
Explanation:
1.H
2.E
3.C
4.O
5.U
6.L
7.D
8.U
9.T
10.P
11. N
12.T
13.I
14.T
15.D
16.O
17.N
18.W
Helium is a type of chemical element which is a noble gas that does not have odor, color, taste and does not contain toxicity. It's atomic number is 2 and is chemically represented with "He"
As a result of this, there are some unique characteristics of the Helium element which includes:
Low boiling pointLow densityHigh thermal conductivityLow solubility, etcPlease note that your question is disjointed so I gave you a general overview to help you understand the concept
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How many grams of magnesium
sulfate (MgSO4) are dissolved in
0.965 L of a 0.0575 M solution?
Molar Mass Mg: 24.30 g/mol
Molar Mass S: 32.06 g/mol
Molar Mass O: 16.00 g/mol
Answer:6.68
Explanation:
What volume of 0.215 M HCl is required to neutralize 50.0 mL of
0.800 M NaOH?
Answer:
186 mL HCl
Explanation:
M1V1 = M2V2
M1 = 0.215 M HCl
V1 = ?
M2 = 0.800 M NaOH
V2 = 50.0 mL
Solve for V1 --> V1 = M2V2/M1
V1 = (0.800 M)(50.0 mL) / (0.215 M) = 186 mL HCl
How many grams of hydrogen gas are needed to completely react with excess nitrogen to produce 26.7 grams of ammonia (NH3)? N2 + H2 → NH3
Answer:
4.74 g H2
Explanation:
First, balance your reaction:
N2 + 3H2 --> 2NH3
Now convert 26.7 g NH3 to moles NH3 by dividing by its molar mass (17.031 g/mol). Then multiply by the mole ratio of 3 mol H2 for every 2 mol NH3 to get moles of H2. Finally multiply by the molar mass of H2 (2.016 g/mol) to get grams of H2.
26.7 g NH3 • (1 mol NH3 / 17.031 g NH3) • (3 mol H2 / 2 mol NH3) • (2.016 g H2 / 1 mol H2) = 4.74 g H2
What does evaporation produce?
a precipitation
b rain or snow
C water vapor
d condensation
Answer:
C water vapor.
or saturated water vapor ( steam )
what causes fraud in public centres
Answer:
there are three causes of fraud, namely, perceived pressure, perceive opportunities and rationalizations. Pressure can take many forms, including financial and employment pressure. A fraudster also may commit fraud when there is an opportunity, frequently related to weak internal control.
Explanation:
This study found that the most popular type of fraud is misappropriation of assets, including theft of cash and inventories. No significant differences were seen in terms of fraudster position, as they can come from both the lower and the executive level. However, the majority of the fraudsters come from the operational and sales department. This study also found that majority of the fraudsters in the case study were male, new employees and young adults. Their motivations to commit fraud include lack of understanding about fraud behaviour, opportunity to commit fraud and lifestyle and financial pressure.
(hope this helps can i plz have brainlist :D hehe)