Answer:
D
Explanation:
Your vocal cords act like a guitar string. True or false and why
Answer:
True
Explanation:
Vocal folds vibrate when excited by aerodynamic phenomena; they are not plucked like a guitar string. Air pressure from the lungs controls the open phase. The passing air column creates a trailing “Bernoulli effect,” which controls the close phase.
Answer:
yes
Explanation:
well for some people because some times u can control your voice and sometimes u just get voice cracks
how many elements are in a Sulfur dioxide
Does a precipitate form when you add 32.5 g of NaCl to 131.0 mL of 0.29 M Pb(NO3)2? (Ksp for possible ppt is 1.7 x 10-5)
Precipitate forms when you add 32.5 g of NaCl to 131.0 mL of 0.29 M [tex]Pb(NO_3)_2[/tex]
What is Ksp?
The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution.
Writing the equation:
NaCl → [tex]Na^+[/tex] + [tex]Cl^-[/tex]
[tex]Pb(NO_3)_2[/tex] → [tex]Pb^2^+[/tex] + [tex]2NO^3^-[/tex]
[tex]Pb^2^+[/tex] + 2[tex]Cl^-[/tex] ↔ [tex]PbCl_2[/tex]
I.P = [ [tex]Pb^2^+[/tex]] * [ [tex]Cl^-[/tex] ]
Ksp [tex]PbCl_2[/tex] =[ [tex]Cl^-[/tex] ] * [[tex]Pb^2^+[/tex] ]
1.7 x [tex]10^-^5[/tex]= [ [tex]Cl^-[/tex] ] * [ [tex]Pb^2^+[/tex] ]
Molarity of NaCl = 4.24 M
Molarity of [tex]Pb(NO_3)_2[/tex] = 0.29 M
Ksp [tex]PbCl_2[/tex] =[ Cl- ] * [[tex]Pb^2^+[/tex] ]
Ksp << IP ⇒ precipitate formation will not take place.
Hence, the precipitate formation will not take place.
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If you made 10.8 moles of AlCl₃, how many moles of Aluminum would you need?
Answer: 10.8 mol
Explanation:
The balanced equation in the image represents the reaction where aluminum chloride is formed from its elements.
From this equation, we know that for every 2 moles of aluminum consumed, 2 moles of aluminum chloride are produced (we can reduce this to conclude that moles of aluminum consumed = moles of aluminum chloride produced)
This means the answer is 10.8 mol.
16.
Which chemical reaction will always be spontaneous? (1 point)
an endothermic reaction in which
entropy increases
an exothermic reaction in which
entropy increases
an endothermic reaction in which
entropy decreases
an exothermic reaction in which
entropy decreases
Answer: an exothermic reaction in which entropy increases
Explanation:
Spontaneous reactions normally cause an increase in entropy and are also exothermic.
Which soil particle is the smallest, drains water slowly, and holds too much water?
Answer:
Clay
Explanation:
Since Clay has a very small particle size it compacts or has a high surface area which slows the path of water, holding it for longer periods compared to other soil components.
Part A
Measure and record the masses of all the metal strips you set out in front of the test tubes.
B IU x X2 10pt
iii
Imi
hili
ole
Test tube
Metal
Mass (g)
1
magnesium
2.
zinc
3
copper
magnesium
4
5
zinc
6
copper
This is a good answer:
Sodium hydroxide reacts with sulfuric acid according to the equation:
NaOH + H2SO4 + Na2SO4 + H2O
27. Name this type of reaction:
28. Balance the chemical equation:
Answer:
27) Double replacement
28) 2NaOH + H2SO4 --> Na2SO4 + 2H2O
what is the coordination number of an atom in FFC unit ?
[tex] \\ [/tex]
ty! :)
Part A Only trace amounts of the synthetic element darmstadtium, atomic number 110, have been obtained. The element is so highly unstable that no observations of its properties have been possible. Based on its position in the periodic table, propose three different reasonable valence electron configurations for this element
Darmstadtium based on its position in the periodic table, proposes three different reasonable valence electron configurations for this element is 2.
What is darmstadtium?Darmstadtium was first synthesized by research scientists at the Heavy Ion Research Laboratory in Darmstadt, Germany in 1994. The element was made by bombarding lead-208 atoms with nickel-62 atoms in a heavy-ion accelerator. Four atoms of darmstadtium were produced in the first experiment.
Darmstadtium is a chemical element with the symbol Ds and atomic number 110.
It is an extremely radioactive synthetic element.
Darmstadtium based on its position in the periodic table, proposes three different reasonable valence electron configurations for this element is 2.
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Oxidation state of Nitrogen in N2O5
Explanation:
Oxidation state of Nitrogen in N2O5 is +5
how many quartz does 456 ml contain
Answer:
431536.9mL
Explanation:
Calculate the number of moles in 5.2g CaCO3
Answer: 0.052moles
Explanation:
number of moles = given mass (g) / molar mass(g/mol)
n=m/M
n= 5.2g/ (40 + 12 + 48)g/mole
n=5.2g/100g/mol
n=0.052 moles
Balance the following reaction:
K3PO4 (aq) +
_Ca(OH)2 (aq) →
_Ca3(PO4)2 (s) +
KOH (aq)
Answer:
3 Ca(OH)2 + 2 K3PO4 ---> Ca3(PO4)2 + 6 KOH
Explanation:
Just balance each atom on both sides.
Please help me im begging
Convert 8.4 kg to grams
Answer:
8,400
Explanation:
multiply 8.4kg by 1000
Answer:
8400g
Explanation:
1kg=1000g
8.4*1000g=8400kg
Which of the following has the most thermal energy? 500 mL water at 25°C 1.5 L water at 25°C 15 L water at 25°C
Answer:
15 L water at 25℃
Explanation:
Answer:
15 L water at 25°C
Question: As the temperature of a substance increases, the average kinetic energy of the particles in the substance
Answer: increases
Explanation:
Select the correct answer from each drop-down menu. A balloon holds a certain volume of air. In what three ways can the volume of the balloon be increased? the number of air molecules in the balloon the temperature of the balloon the pressure on the balloon
On increasing temperature , On decreasing pressure , on increasing the number of air molecules in the balloon volume will increase
What is Ideal Gas Law ?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases.
An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Considering the gas inside the balloon to be ideal
We can understand from the ideal gas equation that
V∝ Temperature
V∝ Number of air molecules
V ∝ (1/P)
Therefore on increasing temperature volume will increase ,
On decreasing pressure volume will increase
and on increasing the number of air molecules in the balloon volume will increase.
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How many grams are in 3.45 moles CO2
To Find:-
Grams Present in 3.45 Moles of Carbon.
We Know:-
Molecular Mass of Carbon Dioxide= 44.01 grams/mol or 44 grams/mol
[tex] \text{Moles} = \frac{\text{Mass}}{\text{Molecular mass}}[/tex]
[tex] \implies 3.45 \text{moles} = \frac{ \text{Mass}}{44 \text{g/mol}} \\ \\ \implies \text{Mass} = {44 \text{g/mol}} \times 3.45 \text{moles} \\ \\ \implies \text{Mass} = {44 \text{g/} \cancel\text{ mol}} \times 3.45 \cancel\text{moles} \\ \\ \implies \text{Mass} = 44 \text{g} \times 3.45 \\ \\ \implies \text{Mass} = \red{151.8 \text{g}}[/tex]
[tex]\therefore \text{Mass of 3.45 Moles of Carbon Dioxide is = \red{151.8g}}[/tex]
Hope This Helps!!About how long does it take for the moon to cycle through all its different observable shapes? (2 points)
Group of answer choices
A day
A month
A year
An hour
Answer:
A month
Explanation:
Can someone help me with this
What is this chemistry form
Answer:
Think it's C16H31FN2O2, but I couldn't find anything else about it.
Explanation:
It's an organic chemistry skeletal structure and it's very difficult to explain how to read. Hopefully this gave you a push in the right direction, I know it wasn't the most complete answer.
What does the word inquire with respect to the process scientific inquiry
Answer:
Science is all about learning and understanding something new. Inquiry means to ask for information or investigate something to find out more. So, scientific inquiry is using evidence from observations and investigations to create logical explanations and answer questions.
Which type of solid is usually the hardest?
• Ionic
• Molecular
• Network
• Metallic
Answer:
metallic is the correct one
Explanation:
Any metal such as iron are usually hard
Metallic type of solid is usually the hardest. Option D is correct.
What is metal?A metal is a solid which is hard in nature shiny and smooth and produce sound when collide with each use to make ornaments, utensils or big machines etc. as there are different metals and hard too.
Some examples are gold, silver, copper, platinum, steel etc. they all are good conductor of electricity mostly copper is used to make wires and steel for making buildings etc. because of strong molecular force they are hard.
Therefore, Metallic type of solid is usually the hardest. Option D is correct.
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You just finished your favorite soda which contained 39.0 grams of sugar (C12H22O11). How many molecules of sugar did you ingest?
The number of molecules of sugar, C₁₂H₂₂O₁₁ you ingest given the data is 6.86×10²² molecules
Avogadro's hypothesis1 mole of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules
But
1 mole of C₁₂H₂₂O₁₁ = 342 g
Thus,
342 g of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules
How to determine the molecules in 39 g of sugar342 g of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules
Therefore,
39 g of C₁₂H₂₂O₁₁ = (39 × 6.02×10²³) / 342
39 g of C₁₂H₂₂O₁₁ = 6.86×10²² molecules
Thus, 6.86×10²² molecules are present in 39 g of sugar, C₁₂H₂₂O₁₁
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How many moles of MgBr2 are 75.24g of MgBr2
Answer:
0.409 mol
Explanation:
The formula to find he number of moles is:
No. of moles = [tex]\frac{mass}{Mr}[/tex]
Mr of MgBr₂ = 24.3 + (79.9 × 2) = 184.1
Mass = 75.25g
So, no. of moles = [tex]\frac{75.24}{184.1}[/tex]
No. of moles = 0.409 mol [to 3 significant figures]
A 0.600-L sample of a 3.75M solution of potassium iodide (KI) contains what mass of KI?
the molarity of a solution made by dissolving 5.67 g of potassium chloride in enough water to make 100.0 mL of solution.
When FeCl2 reacts with K2S, potassium chloride and two compounds are produced. What is the name of the one of the compounds?
Because this is a double replacement reaction, the iron and potassium will swap places, giving [tex]\text{K}_{2}\text{Cl}_{2}[/tex] and [tex]\text{FeS}[/tex].
The names of these compounds are potassium chloride and Iron(II) sulfide
Which statement correctly defines digestion
1.digestion is mixing food with Silva, which is when Mechanical digestion starts.
2.digestion is chewing food, which is a means of chemical digestion.
3.digestion is a reversible process due to mechanical digestion.
4.digestion is the process of breaking down food into smaller molecules
Answer: 4
Explanation: digestion is the process of breaking down food by mechanical and enzymatic action in the alimentary canal into substances that can be used by the body.
Answer:
4.digestion is the process of breaking down food into smaller molecules
Explanation:
if the temperature in the gas cylinder shown increases to 30.0°C and the pressure increases to 1.20, will the cylinder's piston move up or down
Answer:
Up
Explanation:
URGENT PLEASEEEE, WILL GIVE 100 POINTS
Laughing gas, N2O can be turned into smog NO2 by heating the laughing gas in the presence of oxygen. _____N2O + _____O2 -->_____NO2
If 9.00 grams of laughing gas react. How many moles of oxygen react?
If 7.50 grams of oxygen react, how many grams of smog are produced?
Let's balance
2N_2O+3O_2---->4NO_2Moles of laughing gas
9/440.2mol2 moles need 3 mol O_2
1 mol needs= 1.5mol O_2
moles of O_2.
1.5(0.2)0.3mol#2
3 molO_2 produces 4 mol smog 1 mol produces 4/3=1.3mol smogMoles Of O_2
7.5/320.2molMoles of smog
1.3(0.2)=0.26molMass
0.26(46)11.96g2N₂O + 3O₂ ⇒ 4NO₂
mol N₂O = 9 g : 44 g/mol = 0.205
mol O₂ = 3/2 x 0.205 = 0.3075
mass O₂ = 0.3075 x 32 g/mol = 9.84 g
=================================
mol O₂ = 7.5 g : 32 g/mol = 0.234
mol NO₂ (smog) = 4/3 x 0.234 = 0.312
mass NO₂ = 0.312 x 46 g/mol = 14.352 g
