Answer:
D +405.0kJ mol-¹
Explanation:
Since bond energy is the energy required to break a bond, the energy of dissociation of X₂H₆ = +2775 kJmol⁻¹.
Since there is one X-X bond and six X-H bonds,
Bond energy of one X-X bond + Bond energy of six X-H bonds = energy of dissociation of X₂H₆.
Since bond energy of one X-H bond = 395 kJ mol⁻¹, then
Bond energy of one X-X bond + Bond energy of six X-H bonds = energy of dissociation of X₂H₆
Bond energy of one X-X bond + 6 × one X-H bond = +2775 kJmol⁻¹.
Bond energy of one X-X bond + 6 × 395 kJ mol⁻¹ = +2775 kJmol⁻¹.
Bond energy of one X-X bond + 2370 kJ mol⁻¹ = 2775 kJmol⁻¹
Bond energy of one X-X bond = 2775 kJmol⁻¹ - 2370 kJ mol⁻¹
Bond energy of one X-X bond = +405 kJmol⁻¹
Which of the following best describes a meridian of longitude?
A line that is drawn horizontally around the earth and is parallel to the Prime Meridian.
A line that is drawn vertically down the earth and is parallel to the equator.
A line that is drawn vertically down the earth but is NOT parallel to the Prime Meridian.
A line that is drawn horizontally around the earth and is parallel to the equator.
Answer:
A line that is drawn vertically down the earth but is not parallel to the prime Meridian.
Explanation:
A line that is drawn vertically down the earth but is NOT parallel to the Prime Meridian, best describes the meridian of longitude.
What is prime meridian?Prime Meridian is an imaginary line which divides the earth into eastern and western hemispheres
What do you mean by meridian of longitude?Meridian of longitude is an imaginary semicircle that runs from north to south direction and joins the two poles. All meridians are of the same length and meet at the poles.
Hence, option 3 is the answer.
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please help! Chemistry is not my subject! Thanks
Answer:
the answer is B
Al(s) ⇒ Al3+(aq) + 3e-
and Au+(aq) + e- ⇒ Au(s)
What does the chemical formula CaCl2 show about the compound it represents? It is made up of one element. It is made up of two elements. It is made up of three elements. It is made up of four elements.
Answer:
2
Explanation:
not 100%sure hehe
The compound calcium chloride with the formula CaCl₂ has two elements namely, calcium and chlorine. Hence, option b is correct, the compound is made of 2 elements.
What is a compound ?A compound is a chemical substance which is made by the combination of atoms of two or more elements. The bonding type of this elements differ from compound to compound.
Calcium chloride is an ionic compound formed by the electron transfer from calcium to chlorine. The two electrons of the valence shell of Ca is donated to each chlorine atoms.
The number of elements in this compound is thus 2, which are calcium and chlorine. There are three atoms in one calcium chloride molecule. One of calcium and two atoms of chlorine. Hence, option b is correct.
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At 273°K and 1 atm (STP), the volume of a gas is 1000ml. If the temperature changes to
298° K and the pressure is doubled, what is the new volume of the gas?
Answer:
V₂ = 545.79 mL
Explanation:
Given data:
Initial volume = 1000 mL
Initial pressure = 1 atm
Initial temperature = 273 K
Final temperature = 298 K
Final volume = ?
Final pressure = 2 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1 atm × 1000 mL × 298 K / 273 K × 2 atm
V₂ = 298000 atm .mL. K / 546 K.atm
V₂ = 545.79 mL
Draw a number line that represent: it was 29 celculs and it drop down to 16 celculs
Let's take the drop in temperature is - x
expression-> 29-x=16
I have attached the line diagram below.
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A 60.0 g sample of chromium at 82.0°C (specific heat for chromium is 0.11 J/g°C) was placed in 80.0 g of water. Assume there is no loss of heat to the environment. What is the temperature of the water and the chromium? The water's initial temperature was 24.0°C.
The temperature of the water and the chromium : 25.122 ° C
Further explanationThe law of conservation of energy can be applied to heat changes, i.e. the heat received / absorbed is the same as the heat released
Q in(gained) = Q out (lost)
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Q Chromium= Q water
[tex]\tt 60\times 0.11\times (82-t)=80\times 4.18\times (t-24)\\\\541.2-6.6t=334.4t-8025.6\\\\341t=8566.8\\\\t=25.122^oC[/tex]
In a double bond, two atoms share a total of _____ electrons. a two b three c four d six
Answer:
C: 4
Explanation:
In every single covalent bond, each atom shares one electron. 1 + 1 = 2. A double bond is just two bonds so, 2 x 2 = 4.
H2 + O2 -> 2H2O
balanced or unbalanced pls help
Answer:
Unbalanced
Explanation:
The reaction equation is given as:
H₂ + O₂ → 2H₂O
The given reaction flouts the law of conservation of mass and it is not balanced. To know a reaction that is balanced, the number of atoms on both sides of the expression must be the same;
Number of moles
Reactants Products
Hydrogen 2 4
Oxygen 2 2
We see that the hydrogen atoms are not balanced.
What type of bond is Si and S
Need help with these.
I don't know how to transcribe the following DNA sequecne too rna
Answer:
There is only one change when transcribing from a DNA sequence to a RNA sequence.
Explanation:
The change when transcribing is that instead of thymine (T) in a DNA sequence, you have Uracil (U) in a RNA sequence. The rest will stay the same. So, DNA has ATCG, whereas RNA has UACG. There should be NO thymine (T) in your RNA sequence–– it should only include the four of the following: UACG.
[FORMAT]: DNA is to RNA
A is to U (IMPORTANT, NO "T") –– Think as Apples Under the Tree
T is to A –– Think as Trees have Apples
C is to G –– Think as Car in the Garage
G is to C –– Think as Inside the Garage are Cars
true or false all cells are the same size
Answer:
False
Explanation:
Answer:
false
Explanation:
yes
how many electrons are in krypton
Answer: 36
Explanation:
based on the law of multiple proportions, how many grams of hydrogen would you expect 2.58 g of nitrogen to combine with to yield ammonia?
Based on the law of multiple proportions, there are 0.55 grams of hydrogen.
Law of multiple proportions or Dalton's Law said that the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.
In one molecule of the ammonia, there are three hydrogen atoms and one nitrogen atom
In a molecule of ammonia (NH3), proportion of the masses of nitrogen and hydrogen is:
m(N) : m(H) = 14 : (3·1) = 14 : 3
Mass of nitrogen is 2.58 grams
2.58 g : m(H) = 14 : 3
m(H) = 0.55 g; mass of hydrogen needed to react with nitrogen
Balanced chemical reaction: N₂ + 3H₂ ⇄ 2NH₃
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According to Kepler’s 3rd law of motion, which planet will have the shortest orbital period?
A). Jupiter
B). Mercury
C). Earth
D). Saturn
Answer:
B: Mercury
Explanation:
Yuh
PLEASE HELP ASAP!!
Choose the reaction that would not lead to the production of hydrogen gas. a. Cu + HCl
b. Na + H2SO4
c. K + H2O
d. Zn + HCl
Answer:
the answer should be c.
Explanation:
Which of the following is evidence that groundwater cause erosion and deposition
Answer:You didn't provide examples
Explanation: Groundwater can cause erosion under the surface as it moves through the soil. During the movement an acid is formed which what causes erosion and deposition.
Hope that helps
How many Barium would there be in the formula of Barium lodide
Answer: one barium atom and two iodine atoms are present in barium iodide
Explanation:
BaI2 is formula of barium iodide
what two ways do nuclear power reactors harm the enviornment
What did Scientist found that surprised them after making a map of the ocean floor?
a
Subduction
b
Pangea
c
Mid-Ocean ridge
d
Volcanoes
Answer:
C
Explanation:
In 1953 they made soundings and discovered the ocean ridges
Can someone write a speech about Chemistry. plzzzz help
Answer:
Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
n the scope of its subject, chemistry occupies an intermediate position between physics and biology.[5] It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level.[6] For example, chemistry explains aspects of plant chemistry (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).
Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. Primary Chemical bonds e.g covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); Metallic bonds and 2. Secondary chemical bonds e.g. hydrogen bonds;Van der Waals force bonds, ion-ion interaction, ion-dipole interaction etc.
Explanation:
need thanks and make me brainiest if it helps you
A child on a high dive has a mass of 40 kilograms. If the high dive is 10 meters in the air, what is the potential energy?
3920 Joules
400 Joules
4 Joules
Answer:
3920 JoulesExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
From the question we have
PE = 40 × 9.8 × 10
We have the final answer as
3920 JHope this helps you
If the density of hydrochloric acid is 1.49 g/mL , what is the volume of 3.5 g of hydrochloric acid
The volume of 3.5g of hydrochloric acid that has a density of 1.49 g/mL is 2.35mL.
How to calculate volume?Density is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated by dividing the mass of the substance by its volume as follows:
Density = mass ÷ volume
According to this question, 3.5g of hydrochloric acid has a density of 1.49 g/mL. The volume contained in this mass of hydrochloric acid can be calculated as follows:
1.49g/mL = 3.5g ÷ V
V = 3.5 ÷ 1.49
V = 2.35mL
Therefore, the volume of 3.5g of hydrochloric acid that has a density of 1.49 g/mL is 2.35mL.
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When aqueous solutions of Li3PO4 and MgSO4 are mixed, Mg3(PO4)2 is a precipitate
formed. What is the balanced net ionic equation?
Answer:
Li2SO4
Explanation:
Balance the reaction of Li3PO4 + MgSO4 = Li2SO4 + Mg3(PO4)2 using this chemical equation balancer!
Which has more thermal energy: 5 grams of water at 50 °C or 500 grams of water at 50 °C?
Explain your answer.
Answer:
500 grams
Explanation:
its because it has more water. The amount of thermal energy available in a substance is proportional to the mass of the substance.
The ___ is the nations consumer protection agency to help prevent fraud , deception , and unfair business practices .
Answer:
I think it B
Explanation:
Answer:
The answer is FTC or C!!!!!!!!!!!!!!!!!!!!!!!!!!!
Explanation:
What is the charge of phosphate in AlPO4?
The charge of phosphate : 3-
Further explanationOxidation is an increase in oxidation number, while reduction is a reduction in oxidation number.
The formula for determining Oxidation Numbers in general:
1. Single element atomic oxidation number = 0.
Group IA (Li, Na, K, Rb, Cs, and Fr): +1
Group IIA (Be, Mg, Ca, Sr and Ba): +2
Group IIIA(Al, B) : +3
H in compound = +1, except metal hydride compounds (Hydrogen which binds to groups IA or IIA) oxidation number H = -1, for example, LiH, MgH₂, etc.
2. Oxidation number O in compound = -2, except OF2 = + 2 and in peroxide (Na₂O₂, BaO₂) = -1 and superoxide, for example KO₂ = -1/2.
3 The oxidation number in an uncharged compound = 0,
Total oxidation number in ion = ion charge, Example NO₃⁻ = -1
Compound AlPO₄ :
The oxidation number in an uncharged compound = 0
Since the charge of Al as group 3A (or group 13) is +3, while the AlPO₄ compound is a polyatomic compound (consisting of polyatomic ions PO₄ and Al), the PO₄ charge:
charge Al + charge PO₄ = 0
+ 3 + charge PO₄ = 0
charge PO₄ = -3
How many milliliters of 11.5 m hcl(aq) are needed to prepare 675.0 ml of 1.00 m hcl (aq)?
To prepare a solution of hcl(aq) with a volume of 675.0 ml and a concentration of 1.00 m from a concentrated solution of 11.5 m we need a volume of: 58.69 ml
To solve this problem, the formula and the procedure that we have to use is:
c1 * v1 = c2 * v2
Where:
c1= concentration of the concentrated solutionv1 = volume of the concentrated solutionc2 = concentration of the diluted solutionv2 = volume of the diluted solutionInformation about the problem:
c1 = 11.5 mc2 = 1.00 mv2= 675.0 mlv1=?Applying the dissolution of concentrations formula and clearing the volume of the concentrated solution (v1) we get:
c1 * v1 = c2 * v2
v1 = (c2 * v2)/ c1
v1 = (1.00 m * 675.0 ml)/ 11.5 m
v1 = 58.69 ml
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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Why does a pair of jeans look blue?
A. It reflects blue light.
O B. It transmits blue light.
O C. It absorbs blue light.
O D. It reflects all colors of light except blue.
Answer:
A
Explanation:
I believe the answer is A. An object is every color except the color we see, or the color that bounces off of said object. Therefore if a carpet is yellow, the carpet is every color but yellow. Yellow is the color that it rejects, bounces off of it, and the one we see.
To solve this we must be knowing each and every concept related to reflections. Therefore, a pair of jeans look blue because it reflects blue light.
What is reflection?In physics, reflection usually described as a change in the orientation of a waveform at the interface of two distinct media, bouncing the waveform back onto the original medium.
The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. A pair of jeans look blue because it reflects blue light.
Therefore, a pair of jeans look blue because it reflects blue light.
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Which process is a genetic engineering process?
exposing food to radiation, which causes mutation in the genes
removing DNA from cells of the food
replacing some genes of the food with genes from other species
protecting food with an antimicrobial coating
Answer:
Replacing some Gene's of the food with Gene's from other species
Answer:
C. replacing some genes of the food with genes from other species
Explanation:
just did the quiz good luck <3