Answer:
ΔE = q + w
here q = -136 kj
w = 146
so ΔE = -136 + 146 = 10 kj
thus internal energy of system increases by 10 kj...
I hope this helps! :) I don't know if it's the right one
define chemical reactions and the types
Answer:
i gtg soon baby ok?
Explanation:
Which of the following is the most reactive element?
Sodium
Boron
Titanium
Tin
5 points
This type of tissue brings messages back and forth from the brain to the
rest of the body
epithelial tissue
muscle tissue
nervous tissue
connective tissue
Why is it best to use a white
card, bowl or spoon when
testing with the universal
indicator?
because black absorbs heat and white reflects heat so that means the reason why use white is because it reflects heat produced from the universal indivator
Which of the following is a weak base?
A. KOH (potassium hydroxide)
B. NaOH (sodium hydroxide)
C. NH3 (ammonia)
D. LiOH (lithium hydroxide)
Answer:
C.NH3(ammonia) is Answer.
Explanation:
I hope it's helpful!
Answer:
NH3 (Ammonia)
Explanation:
What is always true of a weak base?
A. Some of the original base remains in solution.
B. It has been diluted with water.
C. It does not dissolve or dissociate in water.
D. It contains hydroxide ions.
Answer:
A. Some of the original base remains in solution
Explanation:
A P E X
Wine goes bad soon after opening because the ethanol dissolved in it reacts with oxygen gas to form water and aqueous acetic acid , the main ingredient in vinegar. Calculate the moles of acetic acid produced by the reaction of of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
Answer:
1.70 mol
Explanation:
Wine goes bad soon after opening because the ethanol dissolved in it reacts with oxygen gas to form water and aqueous acetic acid, the main ingredient in vinegar. Calculate the moles of acetic acid produced by the reaction of 54.4 g of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
Step 1: Write the balanced equation
CH₃CH₂OH + O₂ ⇒ CH₃COOH + H₂O
Step 2: Calculate the moles corresponding to 54.4 g of O₂
The molar mass of O₂ is 32.00 g/mol.
54.4 g × 1 mol/32.00 g = 1.70 mol
Step 3: Calculate the moles of CH₃COOH produced by the reaction of 1.70 moles of O₂
The molar ratio of O₂ to CH₃COOH is 1:1. The moles of CH₃COOH produced are 1/1 × 1.70 mol = 1.70 mol.
A careless student forgets to label one of their reagent containers. They know it contains one of the following solutions: 0.1 M NaCl 0.1 M Ca(NO3)2 0.1 M KCH3COO The student decides to add some 0.1 M Pb(NO3)2 to a sample of the reagent in question. Upon stirring, a white precipitate formed. Which of the possible solutions is present in the unlabeled container based on this observation?
A. 0.1 M KCH3COO
B. 0.1 M Ca(NO3)2
C. 0.1 M NaCl
Answer:
0.1 M NaCl
Explanation:
This question reminds of of the solubility rules. Let us recall that all chlorides are soluble except those of lead, mercury II and silver which are insoluble in water.
The following reaction will occur leading to the formation of a precipitate;
Pb(NO3)2(aq) + 2NaCl(aq) -------> 2NaNO3(aq) + PbCl2(s)
The white precipitate formed is PbCl2.
Compare the reactivity of magnesium and calcium explain the difference
Answer:
Calcium is more reactive than magnesium because calcium atom is larger than magnesium atom and it has one more energy level. ... Thus Ca is more reactive than Mg.
what could have caused the mass to be higher than the initial mass
Answer:
Possibly the addition of oxygen from the atmosphere
Explanation:
The absorption of energy from atmosphere causes a rise in mass than the initial mass of a substance.
Absorption of energy can increase the mass of a certain substance while release of energy can decrease the mass of a certain substance. For example, when we freeze liquid water, it forms ice. So, its weight increases when it changes its state from liquid to solid. In the same way when liquid water is boiled, upon vaporization it forms water vapor, which is lighter in mass than liquid water. Thus, we can say that temperature also has a role to play in the increase and decrease of mass of a certain substance compared to its initial mass.
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The question should be
What causes the mass to be higher than the initial mass?
Which of these are associated with the solar wind? Check all that apply.
produces tides
disrupts communication systems
composed of charged particles
travels at about 400 km/s
explains changes in the weather
help nowwwww
Answer:
Disrupts communication systems
Composed of charged particles
travels at about 400 km/s
Answer:
BCD
Explanation:
Is rusting of an iron exothermic or endothermic event if the nail is the system?
exothermic or endothermic?
Answer:
exotherimc reaction
Explanation:
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Answer:
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2. When you transfer energy into a substance, the molecules' kinetic energy
a. Increases
b. Decreases
c. Stay the Same
When you transfer energy into a substance, the molecules' kinetic energy increases and the correct option is option A.
What is Kinetic energy?Kinetic energy is defined as the energy that is produced by an object due to its motion.
To accelerate an object, we have to apply force. To apply force, we need to do work. When work is done on an object, energy is transferred, and the object moves with a new constant speed. We call the energy that is transferred kinetic energy, and it depends on the mass and speed achieved.
Kinetic energy must always be either zero or a positive value.
Therefore, When you transfer energy into a substance, the molecules' kinetic energy increases and the correct option is option A.
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I'm so confused, can someone help me?
a) What is the volume of the Ball to the nearest mL?
ball= _____mL
b) This is called the ______method for determining volume.
c) If the mass of the ball is 120. g, calculate the density of the ball and fill in the correct units.
numerical value of the Density:
Units for density. Enter in lower case and as a single line of text.
Also, use standard abbreviations for units. __________
Answer:
A. 80 mL
B. Water displacement method
C. 1.5 g/mL
Explanation:
A. Determination of the volume of the ball.
Volume of water = 50 mL
Volume of water + ball = 130 mL
Volume of ball =?
Volume of ball = (Volume of water + ball) – (Volume of water)
Volume of ball = 130 – 50
Volume of ball = 80 mL
B. Determination of the name of the method used.
From the above, we can see that the volume of the ball was obtained by calculating the volume of water displaced by the ball.
Thus, the name of the method is WATER DISPLACEMENT METHOD for determining volume of substance.
C. Determination of the density of the ball.
Mass of ball = 120 g
Volume of ball = 80 mL
Density of ball =?
Density = mass / volume
Density of ball = 120 / 80
Density of ball = 1.5 g/mL
The name of the chemical reaction
Answer: C6H12O6 + 6O2 -> 6CO2 + 6H2O. Yields 2755 kJ/mole of glucose. The reverse of this reaction – combing carbon dioxide and water to make sugar – is known as photosynthesis. Photosynthesis is the process responsible for storing all the energy we extract from fossil fuels, crops, and all of our food.
PLEASE HELP IN ONE MINUTE WILL MARK BRAINLIST
The freezing point is 18° C
What is half-life?
Half the life of an organism
The time it takes for the radioactivity of a specific isotope to fall to half its original value
The time it takes for a geologist to determine the age of a rock or mineral
The length and organism lived in prehistoric times
Answer:
The time it takes for the radioactivity of a specific isotope to fall to half its original value
Explanation:
The half time is the time it takes for the radioactivity of a specific isotope to fall to half its original value.
What is half-life?In terms of radioactivity, it is the interval of time that should be needed for one half of the atomic nuclei with respect to the radioactive sample for decaying or here the time interval should be needed for the no of disintegrations per second of a radioactive
Therefore, based on the above explanation, the third option is correct.
And, the rest of the options are wrong.
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3. What is pNa for a solution of 1.76 x 10-3 M
Na3PO4?
I think it is Concentration
what Is the molar mass of H2O
Answer:
18.01528 g/mol
Explanation:
Answer:
18.01528 g/mol
Explanation:
The decomposition of solid barium nitrate leads to the formation of solid barium oxide, diatomic nitrogen gas, and diatomic oxygen gas. Write a formula equation for the reaction.
Answer:
Ba(NO₃)₂(s) ⇒ BaO(s) + N₂(g) + 3 O₂(g)
Explanation:
Let's consider the unbalanced equation for the decomposition reaction of solid barium nitrate.
Ba(NO₃)₂(s) ⇒ BaO(s) + N₂(g) + O₂(g)
We can see that Ba atoms and N atoms are balanced, but we have 6 O atoms to the left side and 2 O atoms to the right. We can get the balanced equation by multiplying O₂(g) by 3.
Ba(NO₃)₂(s) ⇒ BaO(s) + N₂(g) + 3 O₂(g)
What volume of oxygen (in L) is produced
from the complete reaction of 147.1 g of
lead(II) nitrate at STP?
(Pb = 207.2 g/mol, N = 14.01 g/mol, O = 16.00 g/mol)
2Pb(NO3)2(g) → 2PbO(s) + 4NO2(g) + O2(g)
Hint: 1 mole of gas at STP occupies 22.4L
Answer:
12.36 L.
Explanation:
We'll begin by calculating the number of mole in 147.1 g of lead(II) nitrate, Pb(NO₃)₂. This can be obtained as follow:
Molar mass of Pb(NO₃)₂ = 207.2 + 2[14.01 + (16×3)]
= 207.2 + 2[14.01 + 48]
= 207.2 + 2[62.01]
= 207.2 + 124.02
= 331.22 g/mol
Mass of Pb(NO₃)₂ = 147.1 g
Mole of Pb(NO₃)₂ =?
Mole = mass / Molar mass
Mole of Pb(NO₃)₂ = 147.1 / 331.22
Mole of Pb(NO₃)₂ = 1.104 moles.
Next, we shall determine the number of mole of oxygen gas, O₂, produce from the reaction. This can be obtained as follow:
2Pb(NO₃)₂ —> 2PbO + 4NO₂ + O₂
From the balanced equation above,
2 moles of Pb(NO₃)₂ decomposed to produce 1 mole of O₂.
Therefore, 1.104 moles of Pb(NO₃)₂ will decompose to produce = (1.104 × 1)/2 = 0.552 mole of O₂.
Finally, we shall determine the volume occupied by 0.552 mole of oxygen gas, O₂. This can be obtained as follow:
1 mole of O₂ occupied 22.4 L at STP.
Therefore, 0.552 mole of O₂ will occupy = 0.552 × 22.4 = 12.36 L at STP.
Thus, the volume of oxygen gas, O₂ produced is 12.36 L.
Answer:
11.9
Explanation:
its the correct answer lol
A boundary formed when two plates collide
What boundary forms when two plates collide
Answer:
If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction. ... Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges
Explanation:
Hope this helps
PLS THIS IS DUE TODAY HELP ME LOOK AT THE PIC. like i beg you pls.
Answer:
kinetic energy is that form of mechanical energy that has been released and is associated with the body in motion.
Explanation:
My best answer
What is largest and most polluted city in the Western Hemisphere?
Answer:
Califonia
Explanation:
How does an object become electrically charged?
A. Though the transfer of charges from one object to another
B. Through the movement of heat from one object to another
C. Through the transfer of sound from one object to another
D. Through the movement of water from one object to another
Answer: A
Explanation:
Charge cant be created or destroyed, it is only transferred between objects.
Answer:
And it's A
ok now make the first person brainiest
Explanation:
Hope this helps
The formula unit is the representative particle for what?
Answer:
The representative particle of an ionic compound is the formula unit. A formula unit uses a formula to calculate the basic whole number ratio of the ions in an ionic compound.
Explanation:
HAHAH I'm not sure
Help me please!!!
Answer the following question:
A student wants to make a 2.50 M aqueous solution of silver nitrate, AgNO3 and has a bottle containing 21.89 g of silver nitrate. What should be the final volume of the solution?
Find the numerical answer for this question and make sure to include the following:
What is the formula for molarity?
What is the molar mass for silver nitrate?
When you give your numerical answer, what is the correct significant figures and how do you know that is the correct amount?
Answer:
0.052L
Explanation:
Molarity of a substance, which refers to the molar concentration, is calculated as follows:
Molarity (M) = number of moles (mol) ÷ volume (L)
Mole = mass ÷ molar mass
Molar Mass of AgNO3 since Ag = 108, N = 14, O = 16
108 + 14 + 16(3)
= 108 + 14 + 48
= 170g/mol
Mole = 21.89 g ÷ 170g/mol
Mole = 0.129moles
Using Molarity (M) = number of moles (mol) ÷ volume (L)
Volume = number of moles ÷ molarity
V = 0.129 ÷ 2.50
V = 0.0516
To the correct significant figure i.e. 4s.f, the numerical value of volume = 0.052L
Why lysine and threonine doesn't undergo transamination?
Explanation:
Because for two substances to undergo a transamination reaction one must be an alpha amino acid, which Lysine is (it also contains a free amino group in its side chain). Proline is not an alpha keto acid, it is an amino acid which comprises its alpha amino group in a cyclic form (it is a pyrrolidine ring).
HOPE THIS HELPS YOU
Classify each of the following as an element a compound or a mixture
I need help with number 7 please
Answer:
conductivity
Explanation: