Answer:
voltage source
Explanation:
establishes an electric potential difference across the two ends of the external circuit and thus causes the charge to flow. The voltage source is the numerical value of this electric potential difference.
can someone please show work and help me with this thank you <3
Answer:
.846 grams of H2
Explanation:
the heat of vaporization of water is 40.7 kj/mol. at what temperature is the vapor pressure 145 torr
From the calculations and the data provided in the question, the required temperature is 380 K.
What is the Clasius - Clapeyron equation?The Clasius Clapeyron equation is used to obtain the vapor pressure of a substance at two different temperatures.
Hence;
lnP2/P1 = -ΔHvap/R(1/T2 - 1/T1)
ln(145/1) = -40.7 * 10^3/8.314(1/T2 - 1/273)
4.977 = -(4811)(1/T2 - 1/273)
4.977/-(4811) = (1/T2 - 1/273)
-0.00103 = 1/T2 - 1/273
-0.00103 + 1/273 = 1/T2
0.002633 =1/T2
T2 = 380 K
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Calculate the molar mass of the following:
1. HCI
2. ZnF2
3. K2CO3
4. FePO4
5. Cu2s
Show all your work please thank you
Answer:
1. 36.5g 2. 103.3g
3. 140g 4. 151g
5. 159g
Explanation:
1. HCl
atomic mass of H= 1g
atomic mass of Cl = 35.5g
solution:
HCl
= 1+ 35.5
= 36.5g
2. ZnF2
atomic mass of Zn = 65.3g
atomic mass of F = 19g
solution:
ZnF2
= 65.3 + 2(19)
=65.3 + 38
= 103.3 g
3. K2CO3
atomic mass of K= 40g
atomic mass of C = 12g
atomic mass of O = 16g
Solution:
K2CO3
= 2(40) + 12 + 3 (16)
= 80 + 12 + 48
= 140g
4. FePO4
atomic mass of Fe = 56g
atomic mass of P= 31 g
atomic mass of O = 16g
solution:
FePO4
= 56 + 31 + 4 (16)
= 56 + 31 + 64
= 151g
5. Cu2S
atomic mass of Cu = 63.5g
atomic mass of S = 32 g
solution
Cu2S
= 2(63.5 )+ 32
= 127 + 32
=159g
2. Which principle of green chemistry is illustrated by the following scenario?
Chemical company ABC wants to save money. It decides to change its chemical processes to a method that creates fewer waste products which have to
be treated before disposal.
A.)Prevention
B.)The solution to pollution is dilution
C.)Out of sight, out of mind
D.)Less
hazardous
chemical synthesis
Answer:
C
Explanation:
Which of the following is true for a chemical reaction at equilibrium?
Answer:
youre gonna have to include the answers for me to help
Explanation:
Chemicals are classified as health hazards when they pose which of the following hazardous effects?
Answer:
poisoning, breathing problems, skin rashes, allergic reactions, allergic sensitisation, cancer, and other health problems from exposure.
Explanation:
many hazardous chemicals are also classified as dangerous goods.
13. List the following ions in order of increasing radius: Li+, Mg2+, Br"
14. Write Lewis structures for the following:
A. HNNH
B. PC13
Ç. NO-
Answer:
The answer would be B, PC13
Explanation:
Answer:
B: PC13
Explanation:
whats the formula for finding the number of moles in an element reacting with another element
Answer: Mass of substance / Mass of one mole.
Explanation:
When ur a weak acid is dissolved….
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
The Correct choice is A. H+ , F- and HF
Since HF is a weak acid, it behaves like an weak electrolyte in water. so, there is incomplete dissociation of HF in water. Therefore, there will be HF molecules present in the solution along with the ions ~
Please look at the picture attached. If you understand it, it would be nice because I have a Science quiz tomorrow!
Answer:
1. East on the box they are facing, West on the side from behind, North on the left side, South on the right side.
2. Because they all were facing towards the sun and the sun rise from east.
3. This one's answer is in the first answer.
4. The picture shows early morning because the shadow of the boys are in a flat position but if would have been late morning then it would not been covering that much area.
A 43.8 mL sample of a 5.0 M KNO3 solution is diluted to 1.00 L. What volume of the diluted solution contains 17.0 g of KNO3? (Hint: Figure out the concentration of the diluted solution first.)
As the pressure of a gas increases, the ________ decreases, if the temperature is constant.
Answer:
The volume of the gas decreases.Explanation:
A solution is prepared by dissolving 4.85 g of HCl into enough water to make 2.50 L of solution. Calculate the pH of the solution.
The pH of the solution in which 4.85g of HCl is present is 1.3.
How do we calculate pH?pH of the solution will be calculated by using the below equation:
pH = -log[H⁺]
Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massMoles of HCl = 4.85g / 36.4g/mol = 0.13 moles
Given volume = 2.5 L
Concentration in terms of molarity will be calculated as:
M = n/V
M = 0.13mol / 2.5L = 0.05 M
So, 0.05M HCl solution have the same amount of concentration of H⁺ ion. Now pH will be calculated as:
pH = -log(0.05) = 1.3
Hence required pH of the solution is 1.3.
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What are the answers
ILL GIVE A BRAINLY IF YALL ANSWER THIS THANKS
This tree species was preserved as a fossil in the Arizona desert. The species is now extinct. Describe what the environment was like when the tree lived and how it is different now. Then, infer why this type of tree and other living things that lived with it are extinct.
Answer:
Anstree species was preserved as a fossil in the Arizona desert. The species is now extinct. its because we preserved it right so that mean even to it fell down its still alive for the simple reason that we dint ruin it
What does the shape of the moon we see depend on? (2 points)
Group of answer choices
The position of the moon during its orbit around Earth
The position of the moon during its orbit around Jupiter
The position of the moon during its orbit around Mars
The position of the moon during its orbit around Saturn
Answer:
The position of the moon during its orbit around Earth.
Explanation:
Julio rubs a balloon with a clothes and places the balloon next to his head. He uses another balloon and places il next to his head without rubbing a cloth against it Select the control in Julio's experiment.
Answer: i don't know what you mean by control but if you mean what will happen is the balloon if he rubs it on his head and not his clothes electrons move from the atoms and molecules in his hair onto the balloon and since electrons have a negative charge the balloon will become negatively charged and his hair will become positively charged.
Answer: the ballon that was not rubbed with cloth
Explanation:
How many calcium atoms will you need to balance this: Ca(PO4)
Answer: 2
Explanation: Calcium has a +2 charge and PO4 has a -1 charge. When writing this expression, the charges are flipped; instead of Ca2(PO4), it's Ca(PO4)2.
What amount of heat energy would be necessary to raise the temperature of 100 g of water at room temperature (25°C) to the boiling point (100°C)? The specific heat of water is 1.0 cal/g°C.
75 kcal
100 kcal
750 kcal
7.5 kcal
Answer:
7.5 kcal
Explanation:
1.0 cal /g-C * 100 g * (100- 25 C) = 7500 cal = 7.5 kcal
The amount of heat energy necessary to raise the temperature of 100 g of water at room temperature (25°C) to the boiling point (100°C) is 7.5 kcal.
Given to us the mass of water, the specific heat of water, and the change in temperature, we need to calculate the amount of heat energy.
m = 100 g
c = 1.0 cal/g°C
ΔT = (100 °C - 25 °C) = 75 °C
To calculate the amount of heat energy required, we can use the formula:
Q = m × c× ΔT
Where:
Q = heat energy (in calories)
m = mass of water (in grams)
c = specific heat of water (in cal/g°C)
ΔT = change in temperature (in °C)
Substituting the values into the formula:
Q = 100 g × 1.0 cal/g°C × 75 °C
Q = 7500 cal
7500 cal = 7.5 kcal
Therefore, the amount of heat energy required to raise the temperature of 100 g of water from 25 °C to 100 °C is 7500 calories, which is equivalent to 7.5 kcal.
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25 Which statement best describes how energy can be harmful?
A A fire burns down a house.
B Electricity heats an oven.
C A lamp lights a house.
D An alarm clock wakes up a sleeping person.
26 The diagram below shows four boxes labeled A, B, C, and D. The mass of
each box is shown.
550 A
grams
5
grams
50
grams
700 p
grams
Which box is under the box with a mass of 50 grams?
A box A
B box B
Cbox C
D box D
(OVER)
Grade Science - June 19
20
1) The statement "A fire burns down a house" best describes how energy can be harmful. Option (A) is correct.
2) Among the four boxes, Box D has the highest mass of 700 grams. Option (D) is correct.
3) Among the given boxes, Box C is the one with a mass of 50 grams.
Option (B) is correct.
1) In this scenario, the energy in the form of heat from the fire is released uncontrollably, leading to the destruction of the house. Fire represents a potentially dangerous and destructive form of energy when it is not properly contained or controlled. It illustrates how energy, when harnessed inappropriately or unintentionally, can have harmful consequences, causing damage to property and posing a risk to human safety.
2) This means Box D is the heaviest compared to the other boxes labeled A, B, and C. The mass of each box is shown in the diagram, with Box A weighing 550 grams, Box B 5 grams, and Box C 50 grams. Box D, with 700 grams, has the most significant mass, making it the heaviest box in the set.
3) Since the question asks which box is "under" the box with a mass of 50 grams, we can refer to the diagram and see that Box C is positioned above Box D and Box B. Therefore, the only box that is under Box C is Box A. So, the answer is Box A, as it is positioned below Box C in the diagram.
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The complete question is:
1. Which statement best describes how energy can be harmful?
A A fire burns down a house.
B Electricity heats an oven.
C A lamp lights a house.
D An alarm clock wakes up a sleeping person.
2. The diagram below shows four boxes labeled A, B, C, and D. The mass of
each box is shown.
a) 550 grams
b) 5 grams
c) 50 grams
d) 700 grams
3. Which box is under the box with a mass of 50 grams?
a) box A
b) box B
c) box C
d) box D
How Do density and atomic Mass change as atomic number increases
Answer: Atoms with a lower atomic mass have a greater density than the atom with the higher atomic weight because the atoms are tightly packed together. The volume of a material can change with temperature and pressure. This can also modify the density of the material.
Explanation: HOPE IT HELPS YOU . PLEASE GIVE BRAINLIEST . THANKS .
5.1 mol of a compound contains 1 mol of carbon and 1 mol of oxygen what is the molecular mass of the compound
Magnesuim Bromide is a (an) _____ compound.
Answer:What type of compound is Magnesium bromide?
Magnesium bromide (MgBr2) is a chemical compound of magnesium and bromine that is white and deliquescent. It is often used as a mild sedative and as an anticonvulsant for treatment of nervous disorders. It is water-soluble and somewhat soluble in alcohol.
Explanation:
Part 1. A glass bottle, which is half-filled with water, has a balloon attached to its opening. The bottle is placed in a hot water bath for some time. Explain the change to the size of the balloon based on the kinetic molecular theory.
Part 2. What would most likely happen to the balloon if the bottle was then placed into a jar of cold water with ice cubes? Explain your answer based on the kinetic molecular theory.
In both cases, assume the balloon is attached tightly enough so that air does not escape the system. (10 points)
1) Heat is transferred from the bath to the bottle. This will cause the temperature of the gas molecules to increase, and thus their kinetic energy will increase. As a result, the size of the balloon will increase.
2) The size of the balloon would decrease because since the temperature is decreasing, the particles have less kinetic energy, and thus are packed more closely together.
Balance the equation
Ba(OH)2(aq) + HNO3(aq) + Ba(NO3)2(aq) + H2O(1)
Express your answer as a chemical equation, Identify all of the nhases in your
Balanced chemical equation for the given reaction is Ba(OH)₂(aq) + 2HNO₃(aq) → Ba(NO₃)₂(aq) + 2H₂O(l).
What is balanced equation?Balanced equations are those equation in which all entities are present in equal amount on the reactant side as well as on the product side of the chemical reaction.
Balanced chemical reaction will be represented as:
Ba(OH)₂(aq) + 2HNO₃(aq) → Ba(NO₃)₂(aq) + 2H₂O(l)
In the above reaction all entities are present in the equal amount on both side of the chemical reaction.
Hence balanced chemical equation is Ba(OH)₂(aq) + 2HNO₃(aq) → Ba(NO₃)₂(aq) + 2H₂O(l).
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are sedimentary rocks formed weathering erosion and deposition?
Answer:
yes
Explanation:
sedimentary rocks are erosion, weathering, dissolution, precipitation, and lithification
Sedimentary Rocks are layers of deposited dust,smaller rocks & particles. This means that yes Sedimentary rocks are formed from weathering,erosion & deposition.
I HOPE THIS HELPS <3 and good luck!
How many moles of water (H2O) would be produced from the reaction of 3 moles of hydrochloric acid (HCl) reacting with excess calcium hydroxide (Ca(OH)2)?
Answer:
3 moles
Explanation:
The balanced chemical equation between Calcium Hydroxide and Hydrochloric acid is:
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
The ratio of HCl to H₂O is 2 : 2
So if 3 moles of hydrochloric acid is added, 3 moles of water will be formed:
[x is the no of moles of H₂O produced]
2 : 2
3 : x
[Cross multiply]
2x = 2 × 3
2x = 6
x = [tex]\frac{6}{2}[/tex] = 3 moles
What pressure (in atm) is required to contain 0.034 moles of oxygen gas in a 5.1 L container at a temperature of 25.00C
Answer:
0.16 atm
Explanation:
Let's look at the formula PV=nRT. First of all, T should be in kelvin, so let's add 273. Now solve for P so we get P = nRT/V.
Now let's plug these in...
P = (0.034 mol)(0.08206 L atm mol^-1 K^-1)(298 K)/5.1 L
After solving and rounding to sig figs we get 0.16 atm
Fresh whole milk containing 3.5% fat was separated using a centrifuge into cream with 50% fat and skim milk with 0.4% fat what will be the proportion of skim milk to cream
Answer:
For 1hour whole milk feed = (60,000 /6 )Kg=10,000Kg
So that the flow rate of whole milk feed = 10,000 kg/hr
Mass of whole milk=10,000 kg
Mass of cream = x kg Mass of skim milk=(1-x) Mass balance equation is Whole milk= skim milk + cream 10,000kg=skim milk + x kg So, skim milk = (10,000-x) kg Material balance on fat is 10,000kg×0.04 = (10,000-x)×0.004 + x On solving the above equation we get the value of x So, x=361.44 kg So that the flow rate of cream = x= 361.44kg/hr and mass of skim milk= (10,000-x)=(10,000-361.44)kg = 9,638.56 kg So that the flow rate of skim milk = 9,638.56 kg/hr. for checking
(Whole milk) flow rate = (skim milk + cream) flow rate
10,000 kg/hr = (9,638.56 + 361.44) kg/hr 10,000 kg/hr = 10,000 kg/hr Hence it is proved.
__H₂SO4 +2NH₂OH → 2H₂O + _(NH4)₂SO4
How many moles of water will be produced if 3.5 moles of sulfuric acid reacts?
Taking into account the reaction stoichiometry, 7 moles of water will be produced if 3.5 moles of sulfuric acid reacts.
Reaction stoichiometryIn first place, the balanced reaction is:
H₂SO4 + 2 NH₂OH → 2 H₂O + (NH₄)₂SO₄
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂SO₄: 1 moleNH₂OH: 2 moles (NH₄)₂SO₄: 1 moleH₂O: 2 molesMass of water formedThe following rule of three can be applied: If by stoichiometry of the reaction 1 mole of sulfuric acid produces 2 moles of water, 3.5 moles of sulfuric acid produces how many moles of water?
[tex]moles of water=\frac{3.5 moles of sulfuric acidx2 moles of water}{1 mole of sulfuric acid}[/tex]
moles of water= 7 moles
Then, 7 moles of water will be produced if 3.5 moles of sulfuric acid reacts.
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