Answer:
The energy source for all stars is nuclear fusion. Stars are made mostly of hydrogen and helium, which are packed so densely in a star that in the star's center the pressure is great enough to initiate nuclear fusion reactions. In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom.
Explain in terms of intermolecular forces, why pure hydrogen has a lower boiling point than hydrogen bromide.
Both the pure hydrogen and hydrogen bromide is held by weak intermolecular forces of attaction between molecules. Bromide has larger size of electron cloud than Hydrogen, leading to a greater extent of polarisation of the electron cloud. This results in stronger van der Waals' forces of attraction in hydrogen bromide compared to the pure hydrogen. More energy is required to break the stronger bonds in hydrogen bromide than pure hydrogen, leading to a higher boiling point in hydrogen bromide. Thus, pure hydrogen has a lower boiling point.
Explanation:
the strength of intermolecular forces of attraction rely on the size of the electron cloud. the greater the atomic number, the greater the size of the electron cloud and thus, the stronger the forces of attraction.
When asnwering a qn, you want to first state the structure and bonding of the compound, then compare the size of their electron clouds.
Answer structure:
greater size of electron clouds -> greater extent of polarisation of electron cloud -> stronger van der Waals' forces of attraction -> more energy required to overcome the bonds -> higher boiling point
Pure hydrogen has a lower boiling point than hydrogen bromide due to weak intermolecular forces.
What are intermolecular forces?Intermolecular forces are those forces which binds different molecules all together.
Bromide's electron cloud is larger than Hydrogen's, resulting in more polarisation of the electron cloud. In comparison to pure hydrogen, hydrogen bromide has greater van der Waals forces of attraction. Because the stronger bonds in hydrogen bromide need more energy to break than pure hydrogen, it has a higher boiling point. Pure hydrogen has a lower boiling point as a result.
Hence due to less intermolecular forces hydrogen bromide has a lower boiling point.
To know more about intermolecular forces, visit the below link:
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the relative atomic mass of hydrogen is Ar (H) = 1008.Calculate the absolute mass of a hydrogen atom
Answer:
im good but mark brainliest
Explanation:
Answer:
i don think thats what she ment
Explanation:
From the following list of symbols, choose two elements that would likely form a
molecular compound. Explain your choice.
Mg:
S:
K:
O:
Help plzz
Answer:
O ( Oxygen )
because oxygen atom is a non metal and highly electronegative which reacts by itself to form a di-molecular compound of Oxygen
[tex]O _{2}[/tex]
Which organisms have greater variation and produce offspring through asexual reproduction?
O A. bacteria
O B. fungi
o C. invertebrates
O D. mammals
Answer: Fungi
Explanation:
Some organisms are able to reproduce their offspring asexually. Bacteria is an example for asexually reproducing organism which is different from the other organisms given.
What is asexual reproduction?Asexual reproduction is type of reproduction which does not involve fusion of of male and female reproductive systems. Asexual reproduction does not involve a change in the number of chromosomes also.
Prokaryotes are organisms with undeveloped nucleus and cells. Prokaryotes such as bacterias reproduce asexually. The method or reproduction in bacteria is called binary fission.
In binary fission a single cell divides into two identical daughter cells and thus multiplies its population. Thus each daughter cell is clone of the parent cell.
All mammals and invertebrates and fungi are reproducing sexually and their metabolic activities are entirely different from prokaryotes such as bacteria. Thus option A is correct.
To find more about bacteria, refer the link below;
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what is p³×p simplify
Answer:
The answer is p⁴.
Explanation:
You have to apply Indices Law :
[tex] {a}^{m} \times {a}^{n} ⇒ {a}^{m + n} [/tex]
For this question :
[tex] {p}^{3} \times {p}^{1} [/tex]
[tex] = {p}^{(3 + 1)} [/tex]
[tex] = {p}^{4} [/tex]
How many hydrogen atoms are present in 25.3 g of C3H8 (propane)? How many carbon atoms?
please help :(
Answer:
27.65×10²³ atoms of H
10.37×10²³ atoms of C
Explanation:
Given data:
Mass of C₃H₈ = 25.3 g
Number of hydrogen atom = ?
Number of carbon atom = ?
Solution:
Number of moles of propane:
Number of moles = mass/molar mass
Number of moles = 25.3 g/ 44.1 g/mol
Number of moles = 0.574 mol
1 mole of propane contain 3 mole of carbon atoms.
0.574 moles of propane contain 0.574 × 3 mol = 1.722 moles of C.
1 mole = 6.022 ×10²³ atoms of C
1.722 mole × 6.022 ×10²³ atoms of C / 1 mol
10.37×10²³ atoms of C
Number of atoms of H:
1 mole of propane contain 8 mole of hydrogen.
0.574 moles of propane contain 0.574 × 8 mol = 4.592 moles of H.
1 mole = 6.022 ×10²³ atoms of H
4.592 mole × 6.022 ×10²³ atoms of H / 1 mol
27.65×10²³ atoms of H
What type of chemical reaction is:
S8 + 1202 → 8803
• Decomposition
• Double Displacement
• Synthesis
• Single Discplacement
• Combustion
Answer:
Synthesis
Explanation:
That's the answer to that question
A group of Chemistry students have 1.0 mole each of two mystery substances, Substance X and Substance Y, at 50° C. Explain why a conclusion about the kinetic energy of each substance is not possible. (Write in short answer form--- 3-5 sentences)
Answer:
The temperature of a substance in chemistry, is taken as a measure or estimate of the average kinetic energy ([tex]K_{avg}[/tex]) of the atoms or molecules contained in the substance. The 6.02 × 10²³ particles (atoms or molecules) within 1.0 mole of each substance can each posses different amount of kinetic energy at any given time. Some particles move very fast while others move very slow such that the kinetic energy of all the particles are only representable by a distribution and a conclusion regarding the different aspects of the kinetic energy distribution of the particles of the substances is not easily possible
Explanation:
For a gas, we have;
[tex]KE_{avg} = \dfrac{3}{2} \cdot k \cdot T[/tex]
Where;
[tex]KE_{avg}[/tex] = The average kinetic energy
k = 1.38 × 10⁻²³ J/K
T = The gas temperature in Kelvin
Elephant heart cells have 56 chromosomes. Elephant egg cells have
28 chromosomes
112 chromosomes
56 chromosomes
16 chromosomes
Answer:
28 chromosomes
Explanation:
The elephant egg cells will have just half of the original number of chromosomes which is 28 chromosomes.
The other zygote which is the male sperm will also contain 28 chromosomes.
Reproductive cells the egg and the sperm contains a haploid number of cells. During fertilization the cells combine to form a complete diploid where both the male and female genetic material are replicated. This way half of the original chromosome number are taken through to the sex cells.
5.6 x 10^3 cm = ___cg
Answer:
560000 cg
Explanation:
5.6 x 10^3 = 5600
1 g = 100 cg
5600 g = 560000 cg
(08.05 M)
A solution has a [H30) of 1 x 10-3 M. What is the [OH-] of the solution?
11M
14 M
1x 10-14 M
1* 10-11M
The [OH⁻] of the solution : 1 x 10⁻¹¹ M
Further explanationGiven
[H30) : 1 x 10-3 M.
Required
the [OH]
Solution
The water equilibrium constant is a product of the concentrations of [H3O +] and [OH-]
Kw = [H₃O⁺] [OH⁻]
Input the value of [H₃O⁺]
1 x 10⁻¹⁴ = 1 x 10⁻³ x [OH⁻]
[OH⁻] = 1 x 10⁻¹⁴ : 1 x 10⁻³
[OH⁻] = 1 x 10⁻¹¹ M
How many molecules are present in 98.2g of NaNO3
6.96 × 10²³ molecules NaNO₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
98.2 g NaNO₃
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Na - 22.99 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of NaNO₃ - 22.99 + 14.01 + 3(16.00) = 85.00 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 98.2 \ g \ NaNO_3(\frac{1 \ mol \ NaNO_3}{85.00 \ g \ NaNO_3})(\frac{6.022 \cdot 10^{23} \ molecules \ NaNO_3}{1 \ mol \ NaNO_3})[/tex]Multiply: [tex]\displaystyle 6.95718 \cdot 10^{23} \ molecules \ NaNO_3[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
6.95718 × 10²³ molecules NaNO₃ ≈ 6.96 × 10²³ molecules NaNO₃
Help, please, I really need it.
Answer:
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
Venice is ____ of the Adriatic Sea
a - northeast
b - southwest
c - northwest
d- southeast
fill in the blank with one of these ^
When an experiment is repeated and the new results are different from the original results what may likely be inferred?
A)
Additional test/trials are needed.
B)
Both results are wrong due to the discrepancy.
C)
The hypothesis is incorrect and must be modified.
D)
The first must be inaccurate because you are sure the second results
are correct.
Answer:
A ) additional test/trial are needed
When a nitrogen atom covalently bonds to three hydrogen atoms to form ammonia, it still retains one pair of unshared electrons.
According to VSEPR theory, what is the shape of an ammonia molecule?
OA. linear triatomic
OB. tetrahedral
OC
pyramidal
OD. trigonal planar
Answer:
C. Trigonal pyramidal
Explanation:
According to the valence shell electron pair repulsion theory, the shape of ammonia is trigonal pyramidal in nature.
The bond angle is 107° and it has bond pair of 3 and lone pair of 1.
The variations in the bond angles of molecules can be explained by the VSEPR model. This model determines the total number of electron pairs surrounding the central atom of a specie.A tetrahedral is exhibited by methane
Trigonal planar is exhibited by BF₃
CTL
Carlos Almanza
ke'
COL TEACHING LEAD
144%
21. Which of the following is not a transformation from chemical energy to thermal
energy?
a, Coal is burned to boil water
b. An electric stove cooking food
C. Food is digested to regulate body temperature
d. Charcoal is burned in a grill
22. During most energy transformations some energy is transformed and released as
which of the following forms of energy?
How can a conceptual model be used to develop a testable hypothesis? Select one: a. Conceptual models cannot be used to develop a testable hypothesis. b. Conceptual models help us see how things are related and how they connect or work together. This helps us develop a hypothesis based on changes in a variable and the corresponding response of another variable. c. Conceptual models are never revised once they are made. d. Conceptual models are not based prior observations and are guesses used to generate a hypothesis.
Answer:
b. Conceptual models help us see how things are related and how they connect or work together. This helps us develop a hypothesis based on changes in a variable and the corresponding response of another variable.
Explanation:
A conceptual model refers to a vivid representation or conceptualization of the working of a system. Hence conceptual models offer explanations to ideas about systems.
They help to fit all the facts together so that one can make sense of a system. Also, it helps us to understand how changes in one variable affects the other in a system, thereby helping us to formulate a testable hypothesis.
Density is defined as mass per unit volume, or D = m/v. Solve the density
equation for the variable v: *
v = D + m
v = D/m
v = D * m
v= m/D
Answer:
v = m/D
Explanation:
Density is defined as the mass per unit volume, or D = m/v. Solve for Density equation for the variable v:
With this we are making v Which represents volume the subject so;
[tex]d = \frac{m}{v} [/tex]
With this you multiply both sides by ;
[tex]v[/tex]
[tex]v(d) = ( \frac{m}{v})v[/tex]
And then the v will multiply the d making it
“vd” and the ‘v’ will cancel the v making it;
[tex]vd = m[/tex]
So then we divide both sides by d to make v the subject.
[tex] \frac{vd}{d} = \frac{m}{d} [/tex]
So the d cancels the d leaving;
[tex]v = \frac{m}{d} [/tex]
What happens to sound waves when you are moving toward the source of the
sound?
A. Wavelength increases.
B. Wave speed decreases.
C. Amplitude decreases.
D. Frequency increases.
Answer:
B
Explanation:
how to find the number of atoms present in 22g of co2
Answer:
22g of 2
C
O
2
have 3.011×1023
3.011
×
10
23
2
C
O
2
molecules.
Explanation:
Hope this helps! ^^
The image above was taken by the Galileo spacecraft as it visited the asteroid belt on its way to Jupiter. Shown in the image are two rocky-iron bodies. The large object on the left is an asteroid named Ida. The object on the right, which measures only about 1 mile across, is named Dactyl.
Dactyl is a tiny moon that orbits the asteroid Ida. Dactyl orbits Ida due to
A.
the mutual gravitational attraction between the two objects.
B.
small differences in the objects' rocky-iron compositions.
C.
electrical energy transferred between the two objects.
D.
the magnetic force field that defines the asteroid belt.
Answer:
Dactyl orbits Ida due to;
A. The mutual gravitational attraction between the two objects
Explanation:
An orbit is the curved repeating and regular gravitational path of an object that moves round another planet. An object in an orbit moves with the orbital velocity required to bring about an equilibrium between the the mutual gravitational pull (attraction) from the body around which the object cycles and the object and the object's inertia to move in a straight line
Therefore, the moon Dactyl is able to orbit the asteroid Ida due to the force of gravitation between the Dactyl and Ida.
Answer:
A. The mutual gravitational attraction between the two objects
Explanation:
if a dog pushes a toy car with 95N of force for 1w meters in 30seconds how much power did he use
Answer:
Hi... If your distance is 1 meters your answer is 95
But if your distance is 12 that you typed wrong, your answer is 12*95=1140
how many number of molecules are present in 5 moles of methane ch4
Answer:
30 I guess
Explanation:
which of the following is an acid?
starch in water
sugar in water
toothpaste in water
vinegar
bleach
is sugar made of tiny particles
What compound is missing?
3Na2SO4 + 2AlCl3 →+ _____ + 6NaCl
Answer:
Al2(SO4)3
Explanation:
3Na2SO4 + 2AlCl3 →+ Al2(SO4)3 + 6NaCl
The population of the United States in 1630 was around 4,500. In 2017, the population was around 326,500,000. What percent increase does this represent?
Answer:
7255455.5%
Explanation:
Giveb that
population in 1630 = 4500
Population in 2017 = 326,500,000
Percentage increase :
((Change in population) / initial population) * 100%
((326,500,000 - 4500) / 4500) * 100%
(326495500 / 4500) * 100%
72554.555 * 100%
= 7255455.5%
What action is the best example of a direct observation
Answer:
The best example of direct observation is when the researcher of animal behavior directly observe how animal lives in a reservation.
what is the realationship between chemicals and cancer
Answer:
Explanation:
"An early link between cancer and a chemical was found in the late 1700s. An English physician noted that a large number of chimney sweeps had cancer of the scrotum due to exposure to soot, which contains chemicals known as polycyclic aromatic hydrocarbons. Since then, many more chemicals have been identified as known or suspected causes of cancer. "
Answer:
Chemical cause cancer
Explanation: