Answer:
Largest is Mg as across the period atomic radius decreases
2 H2O(l) → 2 H2 (g) + O2 (g) ΔH°rxn = +572 kJ Determine the heat associated with the reaction (qrxn, in kJ) when 4.85 grams of H2(g) is produced.
The heat associated with the reaction (qrxn, in KJ) when 4.85 grams of H₂ is produced is +693.55 KJ
Balanced equation2H₂O → 2H₂ + O₂ ΔH°rxn = +572 KJ
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass of H₂ from the balanced equation = 2 × 2 = 4 g
SUMMARY
From the balanced equation above,
When 4 g of H₂ is produced, 572 KJ of heat where needed.
How to determine the heat requiredFrom the balanced equation above,
When 4 g of H₂ is produced, 572 KJ of heat where needed.
Therefore,
When 4.85 g of H₂ is produced = (4.85 × 572) / 4 = +693.55 KJ of heat will be required.
Thus, +693.55 KJ of heat is required for the reaction.
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The (15-35-15) number on a bag of fertilizer is calculated by an outdated method. All modern fertilizers use PO43- as a source of phosphorus. Use your knowledge of the old methods to determine the moles of phosphorus found in 10.0 grams of (15-35-15)?
The (15-35-15) number on a bag of fertilizer is calculated by an outdated method. Using the knowledge of the old methods, the number of moles of phosphorus found in 10.0 grams of phosphorus is 0.05 mole.
The (15-35-15) number on the bag of fertilizer is used for:
Nitrogen 15 : Phosphorus pentoxide 35: potassium oxide 15Thus, in a 100-gram bag of fertilizer, there are 35 grams of phosphorus pentoxide P₂O₅.
∴
To determine the number of moles of 10 grams of phosphorus pentoxide in (15-35-15) bag of fertilizer, we have:
[tex]\mathbf{=10 \times \dfrac{35}{100} \ grams \ of \ P_2O_5}[/tex]
= 3.5 grams of P₂O₅
Recall that:
[tex]\mathbf{Number of moles = \dfrac{mass}{molar \ mass}}[/tex]
the molar mass of P₂O₅ = 142 g/mol∴
[tex]\mathbf{Number of moles = \dfrac{3.5\ g}{ 142 \ g/mol}}[/tex]
[tex]\mathbf{Number of moles = 0.0246 \ mol}[/tex]
Provided that 1 mole of P₂O₅ harbors 2 moles of phosphorus;
Then;
The number of phosphorus present in 10.0 grams of (15-35-15) fertilizer is:
= 0.0246 moles × 2
= 0.0492 moles
≅ 0.05 moles
Therefore, we can conclude that the number of moles of phosphorus found in 10.0 grams of (15-35-15) bag of fertilizer is 0.05 moles.
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At what temperature will water begin to boil
Answer:
water will boil at 100 celcius or 212 farenheit
please give brainliest
Answer:
At 100° C or 373.15K
Explanation:
How are energy and work related?
O A. Work and energy are the same.
B. Work times energy is force.
C. Energy is the force needed to do work.
D. Energy is the capacity to do work.
SUBMI
Answer:
c
Explanation:
because u need the energy to be able to work
Which two substances are among the four major types of organic
compounds made by living things?
A. Potassium
B. Water
C. Carbohydrates
D. Proteins
Answer: Carbs and proteins
Explanation:
Answer:
the answer is proteins
Explanation:
did the problem
what is kinetic enegry
Kinetic energy → the kinetic energy of an object is the energy that it possesses due to its motion
For an example ↓
At 25 degrees what is the [H+] and pH of a solution with a [OH] = 3.2 x 10^8 M?
Answer:
0.4699
Explanation:
What is the angle between the following two hybrid orbitals on the same atom?
(a) sp and sp hybrid orbitals:
degrees
(b) sp and sp hybrid orbitals:
es
degrees
(c) sp and sp2 hybrid orbitals:
degrees
Answer: a) sp and sp hybrid orbitals:
180 degrees
(b) sp and sp hybrid orbitals:
es
120 degrees
(c) sp and sp2 hybrid orbitals:
109.5 degrees
Explanation:
The angle between the following two hybrid orbitals on the same atom is sp and sp hybrid orbitals: 180°, sp and sp hybrid orbitals: 120° and sp and sp2 hybrid orbitals: 109.5°
What is hybrid orbitals?Hybrid orbitals are defined as the outcome of a model that generates a new set of orbitals by combining atomic orbitals on a single atom.
It can also be defined as a form of atomic orbital that emerges when two or more atomic orbitals of an isolated atom mix.
It can be defined as the forming new atomic orbitals by combining two or more common atomic orbitals.
The process which forms hybrid orbitals are known as hybridization.
There are mainly five types of hybridization.
LinearTrigonal planerTetrahedral Trigonal bipyramidal OctahedralThus, the angle between the following two hybrid orbitals on the same atom is sp and sp hybrid orbitals: 180°, sp and sp hybrid orbitals: 120° and sp and sp2 hybrid orbitals: 109.5°
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Select the best answer.
Which element's atoms are most likely to touch each other without overlapping?
iron
hydrogen
carbon
radon
Answer: iron
Explanation: Metals' atoms are closely bonded in a crystal lattice. In metallic bonds, the electron cloud boundaries of atoms touch each other. Many nonmetals occur as diatomic molecules. The electron clouds of these two bonded nonmetal atoms overlap .
Hydrogen atoms are most likely to touch each other without overlapping because of their small size and simple atomic structure.
A hydrogen molecule is a particle of the synthetic component hydrogen. The electrically unbiased molecule contains a solitary emphatically charged proton and a solitary adversely charged electron bound to the core by the Coulomb force. Nuclear hydrogen is around 75% of the baryonic mass of the universe.
Hydrogen exist as diatomic particle, I.e., it can exist by attaching to another hydrogen. You realize that hydrogen has just a single electron in it's furthest and just shell. Yet, to accomplish a steady design, there should be two electrons in this shell. So two hydrogen molecules share their electrons by holding.
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An image of Earth's layers is below
What is layer C?
Crust
Mantle
Inner core
Outer core
Answer:
the mantle is layer C.
Explanation:
the crust would be layer A. inner core would be layer D. outer core would be layer B.
Which of the following is the smallest number?
100
1
.0035
.0000000000000000000003
Answer:
.0000000000000000000003
Explanation:
In 1988, three gray whales were trapped in Arctic ice. Television crews captured the frantic attempts of hundreds of people to save the whales. Eventually, a Soviet icebreaker and U.S. National Guard helicopters arrived to help free the whales. The cost of the rescue mission exceeded $5 million.
i. Write a scientific question related to the whale story.
ii. Write a nonscientific question related to the whale story.
The scientific question related to the whale story is how were the whale's rescued? The non-scientific question related to the whale story is what was the need for spending such large amount of money?
What is a scientific question?It is a one where an investigation can be designed and can be approached to completion in order to find out an answer.This can be done without doing different investigations.
It should have valuable information and should have the potential that it can be answered by direct observations.It should always lead to a hypothesis.
A scientific question must have the following characteristics:
It must have an objective and should be testable.It should focus on an independent variable and a dependent variable.It should be feasible and coherent.Whereas, characteristics of a non -scientific question is that they are broad,and have many variables to be tested.
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from the illustration of the potassium atom fill in the periodic table selection
Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
If Bromine has a charge of 1-, how many electrons does it have?
Answer:
35
Explanation:
The atomic number for bromine is 35, which means it has 35 protons in its atomic nuclei. A neutral bromine atom would also have 35 electrons. In order for a bromine atom to become a
1
−
bromide ion, it would have to gain an additional electron.
Which statement is an example of a scientific hypothesis?
A.
What type of fertilizer is best for growing beans?
B.
Only half of the bean plants grew over six inches.
C.
How long is the life cycle of a bean plant?
D.
Bean plants will grow best in well-drained soil.
Answer:
D
Explanation:
Which factor causes Earth’s seasons?
Answer:
The sun's position near earth
Explanation:
The following reaction represented oxidation of organic matter (CH2O) using nitrate ions.
If G° = -118.7Kj/mol at 25°C, calculate E°CELL and the equilibrium constant for this
reaction:
14 CH20 + 1/5 NO3 +1/5 H
= CO2 + 1/10 N2 +7/20 H2O
[5]
sorry but i don't know again sorry!
What type of element are the following elements?
A) Na
B) Со
C) Bi
D) O
Si a un resorte se le cuelga una masa de 800 g y se deforma 50 cm. ¿Cuál será el valor de su constante en N/m? (g = 9.81m/s2).
Answer:
50cm
Explanation:
because thats the only thing i got
PLEASE HELP , 50 points!
Write the electron configuration of a -2 ion with 16 protons.
Answer:
1s^2 2s^2 2p^6 3s^2 3p^6
Explanation:
Number of electrons = Number of protons. Originally, sulfur has 16 protons, but the question asks states 2- ions. So S^(2-), or a total of 18 protons. Follow the rules, and make sure the exponents add up to 18. 2 + 2 + 6 + 2 + 6 = 18 electrons.
Describe the relationship between the state of matter of water (gas, liquid, solid) and the motion of the water molecules
Water has three states of matter namely gas, solid or ice form and liquid. Molecules in solid state are not able to move since they are tightly packed.
Molecules can move in liquid state and they moves easily in gaseous state.
What is states of matter?Every substance have three states, that are gas, liquid and solid. In solid state, molecules are tightly packed and are unable to move apart. In liquid state, molecules have some space to move and motion of liquid is easy.
The movement of molecules in a substance depends on the space allotted for them or called the volume. More volume between molecules, easy to move apart.
Gaseous state is composed of molecules located far apart from each other and they diffuse easily. Therefore, motion in three states of water is different and moves faster in gaseous state.
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How many more electrons does each oxygen atom need to be stable?
The basic unit of structure and function of living things is the .
Answer:
It would be cell
Explanation:
If im correct then please mark me as brainliest!
Question 5 of 5
Which idea was not supported by Dalton's atomic model but was supported in
all later atomic models?
A. A central, positive nucleus
B. Electrons in orbits
C. Positive and negative parts
D. Electron clouds
Answer:
It’s A
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions. According to Dalton, the atoms of same element are similar in all respects.
describe another medical condition or disease where the primary system causes a serious problem with a secondary system
Answer:
Congestive heart failure
Explanation:
Congestive heart failure happens when your heart gets too weak to pump blood from the lungs out to the body. Pressure builds up in the heart which puts pressure on the blood vessels of the lungs. This will lead to leakage of the vessels and the fluids build up in the air sacs of the lungs. This condition is called pulmonary edema.
Pulmonary edema occurs when fluid builds up in the lungs making it hard to breathe. It may start out as running out of breath easily but if left untreated (both conditions) symptoms get worse over time.
Molybdenum can form a wide series of halide compounds, including four different fluoride compounds. The percent by mass of molybdenum in the four compounds is 63.0%,
56.0%,
50.0%,
and 46.0%.
Determine the formula and name for each of the four different molybdenum fluorides.
The formula and names of the compounds are:
1. Formula of compound => MoF₃
Name of compound => Molybdenum trifluoride
2. Formula of compound => MoF₄
Name of compound => Molybdenum tetrafluoride
3. Formula of compound => MoF₅
Name of compound => Molybdenum pentafluoride
4. Formula of compound => MoF₆
Name of compound => Molybdenum hexafluoride
1. Determination of the name and formula of the molybdenum fluoride having 63.0% of molybdenum.
Molybdenum (Mo) = 63.0%
Fluorine (F) = 100 – 63 = 37%
Formula =?Mo = 63.0%
F = 37%
Divide by their molar mass
Mo = 63.0 / 96 = 0.656
F = 37 / 19 = 1.947
Divide by the smallest
Mo = 0.656 / 0.656 = 1
F = 1.947 / 0.656 = 3
Therefore,
Formula of compound => MoF₃
Name of compound => Molybdenum trifluoride
2. Determination of the name and formula of the molybdenum fluoride having 56.0% of molybdenum.
Molybdenum (Mo) = 56.0%,
Fluorine (F) = 100 – 56 = 44%
Formula =?Mo = 56%
F = 44%
Divide by their molar mass
Mo = 56 / 96 = 0.583
F = 44 / 19 = 2.316
Divide by the smallest
Mo = 0.583 / 0.583 = 1
F = 2.316 / 0.583 = 4
Therefore,
Formula of compound => MoF₄
Name of compound => Molybdenum tetrafluoride
3. Determination of the name and formula of the molybdenum fluoride having 50.0% of molybdenum.
Molybdenum (Mo) = 50.0%,
Fluorine (F) = 100 – 50 = 50%
Formula =?Mo = 50%
F = 50%
Divide by their molar mass
Mo = 50 / 96 = 0.520
F = 50 / 19 = 2.632
Divide by the smallest
Mo = 0.520 / 0.520 = 1
F = 2.632 / 0.520 = 5
Therefore,
Formula of compound => MoF₅
Name of compound => Molybdenum pentafluoride
4. Determination of the name and formula of the molybdenum fluoride having 46.0% of molybdenum.
Molybdenum (Mo) = 46.0%,
Fluorine (F) = 100 – 46 = 54%
Formula =?Mo = 46%
F = 54%
Divide by their molar mass
Mo = 46 / 96 = 0.479
F = 54 / 19 = 2.842
Divide by the smallest
Mo = 0.479 / 0.479 = 1
F = 2.842 / 0.479 = 6
Therefore,
Formula of compound => MoF₆
Name of compound => Molybdenum hexafluoride
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Write the chemical formula for the ionic compound formed by aluminum and chlorine.
Answer:
AICI3
one aluminum and three chlorine
Answer:
→
[tex]{ \rm{AlCl _{3} }}[/tex]
Explanation:
Equation:
[tex]{ \rm{2Al_{(s) } + 3Cl _{2(g)} \dashrightarrow \: 2AlCl _{3(s)}}}[/tex]
Hello there
i am looking for some quick help on this question thank you.
Liquid B has a mass of 75 g and a volume of 25 ml. What is liquid B's density?
1: .33 g/ml
2: 3 g/ml
3: 75 g
4: 25 ml
Answer:
To measure the density of a liquid you do the same thing you would for a solid. Mass the fluid, find its volume, and divide mass by volume. To mass the fluid, weigh it in a container, pour it out, weigh the empty container, and subtract the mass of the empty container from the full container.
Explanation:
Answer:
[tex] \rho = \frac{mass}{vol} \\ = \frac{75 \: g}{25 \: ml} = 3g .{ml}^{ - 1} [/tex]
PLS GUYS HELP!!!! Examine the table with the distances and times recorded for five different trains. Calculate the average speed for each train and select the correct answer choices. Select ALL that apply.
Answer:
A: Train I had the fastest average speed
C: Trains II and V had the same average speed
E: Trains III and IV had the same average speed
Explanation:
The Density equation is:
Answer:
p=m/v
p equals density M equals mass and v = volume