Answer:
i do not now
Explanation:
Consider the molecules H2O, H2S, H2Se, and H2Te. Which do you expect to have the highest boiling point, and why?
a. H2O, because it experiences hydrogen bonding.
b. H2S, because it dissociates and forms ions.
c. H2Se, because it experiences ion-dipole forces.
d. H2Te, because it has the most electrons to form a dipole.
Answer:
a. H20,because it experiences hydrogen bonding.
Answer:
H2O, because it experiences hydrogen bonding.
Explanation:
I got it right
Which statement best describes how an ionic bond forms?
The transfer of electrons forms strong bonds between ions.
The sharing of electrons forms strong bonds between ions.
The transfer of electrons results in repulsive forces between molecules.
The sharing of electrons results in attractive forces between molecules.
The transfer of electrons forms strong bonds between ions is the best
statement that describes ionic bond formation.
Ionic bond is also known as electrovalent bonding. It involves the transfer
of electrons from an element to another. This is done so as to enable the
elements achieve a stable configuration and formation of new compounds.
The ionic bonds formed are usually strong so as to prevent the elements
from losing their stable configuration.
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What is the number of grains of rice in the 40 mL sample? Show all of your work using dimensional analysis.
The number of grains of rice in the 40 mL sample : 880 grains
Further explanationGiven
from recorded data:
mass of 20 grains rice = 0.4 g
mass beaker = 29.5 g
mass beaker+rice=47.1 g
mass only rice = 17.5 g
Required
the number of grains of rice
Solution
Maybe if we use a digital scale with high resolution accuracy we can get the mass of 1 grain of rice
But we still use existing data
To determine the mass of rice in the beaker, we just need to find the difference between the mass of the beaker + rice - beaker, or we can set the scale to zero before we add rice to the beaker.
If we look at this difference, the mass of the rice in the beaker should be :
47.1-29.5 = 17.6 g
Since the data shows that 20 grains of rice mass 0.4 g, so 17.6 g of rice contains:
[tex]\tt 17.6~g\times \dfrac{20~grains}{0.4~g}=880~grains[/tex]
5.Are pure solids included in equilibrium expressions? Explain your answer.
Answer:
Pure solids or liquids are excluded from the equilibrium expression because their effective concentrations stay constant throughout the reaction. The concentration of a pure liquid or solid equals its density divided by its molar mass.
Explanation:
Hope this helps!!!
I need help, and fast, please.
How many moles are in 150.0 grams of Fe2O3
Answer:
its 150 hope this helps
Explanation:
Please help me out I need to know what the two atoms have in common.
Answer:
I think it's atomic number?
Explanation:
Really sorry if that's wrong
The chemical process in which small organic molecules called monomers bond together to form a chain is called A) production B) polymerization C technology D) modification
Multiple lines between two atoms in a covalent lewis dot diagram mean:
A That there are more atoms involved
B That multiple electrons are shared between the atoms
C That the atoms are not bonded
D That the bond is easier to break
PLEASE HELP
In the equation 2KCIO3 → 2KC1 + 302, how many moles of oxygen are produced when 3.0 mol of KCIO3 decompose completely?
Moles of Oxygen produced : 4.5 moles
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
The reaction coefficient shows the mole ratio of the reactants and products
Reaction
2KCIO₃ → 2KCl + 30₂
moles of KCIO₃ = 3
From equation, mol ratio of KCIO₃ : O₂ = 2 : 3, so mol O₂ :
[tex]\tt mol~O_2=\dfrac{3}{2}\times 3=4.5[/tex]
Is there currently a cure for HIV
Answer:
No
Explanation:
There are vaccines, to prevent it, made by Dr. Fauci, but no cure
Which landform explains the lack of cultural interaction between ancient China and ancient India? (4 points)
the Loess Plateau
the Chang River valley
the Gobi Desert
the Himalaya Mountains
Answer:
I had this question and it was the 4th one for me
Explanation:
Thirsty Thursday:) post your celebrity crush
Or post your favorite drink :)
Answer:
My celebrity crush is young Keanu Reeves and my favorite drink is matcha tea
Explanation:
Answer: I don't really have a celeb crush but my favorite drink is Mango Slushie with boba.
Explanation:
A cube of zinc at 15.C is placed in contact with a cube of tin at 45. Which statement describes the initial flow of heat between the cubes? *
Find the number of atoms and find the number of moles of S in 16 grams of sulphur
Answer:
Number of moles = 0.5 mol
3.011 ×10²³ atoms
Explanation:
Given data:
Mass of sulfur = 16 g
Number of moles = ?
Number of atoms = ?
Solution:
Number of moles of S:
Number of moles = mass/molar mass
Number of moles = 16 g/ 32 g/mol
Number of moles = 0.5 mol
Number of atoms:
1 mole contain 6.022×10²³ atoms
0.5 mol × 6.022×10²³ atoms / 1 mol
3.011 ×10²³ atoms
What is the relationship between DNA and proteins?
Explanation:
At first sight, I could recognize you
As if we were calling for each other
The DNA in my blood vessels tell me
That it’s you I was looking all over for
Mole Conversion: How many moles in 45 grams of H2SO4
Answer:
0.45881381335
Explanation:
divide 45 by the molar mass of H2SO4
45/98.079
Answer:
0.45
Explanation:
divise
What do the two arrows in the diagram most likely represent?
O radiation
O photosynthesis
cellular respiration
Oenergy transfers
how many moles of aluminum are needed to produce 2.8 moles of aluminum chloride
Answer:
1.4 mol
Explanation:
that my i got i was doing for it
6. What are two uses for nonmetals?
a student observed the shape of the moon once every 7 days during the month of June. which of the following sets of drawings shows how the moons shape could have changed during the month of June?
True or False Hydrogen is amable used to in limpa
Answer:
False
Explanation:
Answer:
false
Explanation:
false
Mole Conversion: How many molecules are in 0.348 moles of Dihydrogen oxide?
Question 4
Calculate the nlass of 7.1 x 1024 formula units of magnesium hydroxide, Mg(OH),.
its me again this is how you find the answer. note: i dont have the periodic table to see the exact atomic mass to find the molar mass however this is the answer:
so the actual formula is Mg(OH) with a 2 as a subscript because there are 2 Mg. so with Mg(OH)2 the Molar mass is 58.32g/mol. 58.32 g/mol x 7.1x1024 = 4.1x1026g
What is the result of excess nutrients (nitrates) in North Carolina waters?
A.Algae growth is high
B.Algae growth is low
C.Algae growth is moderate
Answer:
A. Algae growth is high
Explanation:
Substances that contains high concentration of nitrates, phosphates etc add nutrients to the water body. This is because organisms like ALGAE consider these compounds nutrients needed for their growth and development. The process whereby these nutrients becomes excessive in a water body is referred to as EUTROPHICATION.
Eutrophication of a water body i.e excessive nutrients like nitrates in a water body like the North Carolina waters being described in this question will lead to rapid and excessive growth of algal species. This increase in algal growth can cause the water body to be low in oxygen content and ultimately become inhabitable by living organisms.
name the process of separating into immiseible liquid?
Answer:
Decantation
Explanation:
Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension.
How many moles contain 9.15 x 1022 atoms of Ag?
Select the correct response.
0.152 mol
9.15 mol
0.325 mol
5.51 mol
Answer:
0.152 molExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{9.15 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.151993...[/tex]
We have the final answer as
0.152 molesHope this helps you
Most elements occur in nature as a single isotope.
TRUE
FALSE
Answer:
false
Explanation:
because elements never exist in nature as single isotopes they are always combined
Answer:
FALSE
Explanation:
in the cases of three elements (tellurium, indium, and rhenium) the most abundant isotope found in nature is actually one (or two) extremely long-lived radioisotope(s) of the element, despite these elements having one or more stable isotopes.
1. Using prefixes, name this molecule: H20.
Answer:
water
Explanation:
the scientific answer would be hydro but it also means water
Justifica cuál de las tres medidas siguientes es mejor. a) Una masa de 3 kg con un error absoluto de 1 g. b) Una masa de 4 g con un error absoluto de 1 mg. c) Una masa de 95 kg con un error absoluto de 1 kg.
Answer:
La mejor medida, con el error porcentual más pequeño de 0.025% es una masa de 4 g con un error absoluto de 1 mg
Explanation:
Tenemos el error porcentual dado como sigue;
[tex]El \ porcentaje \ error =\dfrac{\left | v_A - v_e \right |}{v_E} \times 100[/tex]
Dónde;
[tex]\left | v_A - v_e \right | = Error \, absoluto[/tex]
[tex]v_e[/tex] = El valor esperado
La mejor medida tiene el menor porcentaje de error;
a) Para una masa de 3 kg con un error absoluto de 1 g, tenemos;
El valor esperado, [tex]v_e[/tex] = 3 kg
Error absoluto = [tex]\left | v_A - v_e \right |[/tex] = 1 g = 0.001 kg
Que da el error porcentual = 0.001/3 × 100 = 0.0[tex]\bar 3[/tex]%
b) Una masa de 4 g con un error absoluto de 1 mg = 0,001 g
El valor esperado, [tex]v_e[/tex] = 4 g
Error absoluto= [tex]\left | v_A - v_e \right |[/tex] = 1 mg g = 0.001 g
El porcentaje de error = 0.001/4 × 100 = 0.025%
c) La masa medida dada = 95 kg
El error absoluto = 1 kg
El valor esperado, [tex]v_e[/tex] = 95 kg
Error absoluto = [tex]\left | v_A - v_e \right |[/tex] = 1 kg
El porcentaje de error = 1/95 × 100 ≈ 1.053%.
Por lo tanto, la mejor medida, con el menor porcentaje de error de 0.025% es una masa de 4 g con un error absoluto de 1 mg.