Answer:
covalent is the bonding that occurs in H2O
Explanation:
What unusual pattern occurs during El Niño
Explanation:
During this time, unusual winds cause warm surface water from the equator to move east, toward Central and South America. El Niño can
How do collisions between molecules transfer energy from a system of
reacting substances to its surroundings?
A. They cause heat to flow from the system to the surroundings.
O B. They cause molecules to flow into the system from the
surroundings
C. They cause the potential energy of the system to increase
D. They cause the thermal energy of the surroundings to decrease.
Answer:
A. They cause heat to flow from the system to the surroundings.
Explanation:
Answer:
A. They cause heat to flow from the system to the surroundings.
Explanation:
a p e x , just took the quiz
10. Which one of the following is not true about covalent bonds?
Most covalent substances do not dissolve well in water
Covalent bond can form polar and non polar bonds and shape
Covalent bond is one of the strongest bonds
Most of covalent substance does not conduct heat and electricity
Most covalent bonds have moderate to love melting and boiling point
Answer:
Most covalent bonds have moderate to love melting and boiling point
Explanation:
Most covalent compounds have relatively low melting points and boiling points.
True or False: Electromagnetic waves are classified according to wavelength, or the distance between waves.
Answer: True
Explanation:
An intravenous solution of mannitol is used as a diuretic to increase the loss of sodium and chloride by a patient. If a patient receives 30.0 mL of 25% (m/v) mannitol solution, how many grams of mannitol were given?
Answer:
Explanation:
25 % ( m / v ) mannitol solution means 25 gram in 100 cc of water
25 gram in 100 mL of water
grams of mannitol in 30 mL = 25 x 30 / 100
= 7.5 grams .
Q
1 At which electrode does reduction always take place?
2 Give the half-equation for the reaction at the anode, during
the electrolysis of these molten compounds:
a potassium chloride b calcium oxide
3 Give the two half-equations for the electrolysis of:
a a concentrated solution of hydrochloric acid, HCl
b a dilute solution of sodium nitrate, NaNO3
c a dilute solution of copper(II) chloride, CuCl2
complete the bolded items in each box below
Show the bolded items and the boxes.
Where do an organisms genes come from?
O Mother
O Father
O Both mother and father
O Neither mother nor father
Answer:
Organisms genes come from both mother and father :3
Explanation:
:3
list the factor on which Ka of a weak acid depends
Explore: Arrange the matter
from largest to smallest.
Organ
Molecule
Organelle
. Atom
Organism
. Cells
. Tissues
Elements
Answer:
The levels, from smallest to largest, are: molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.
Explanation:
The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
Answer:
the matter
from largest to smallest.
- organism-organ-organelle-tissue-cell-atom-elements-molecule
The partial pressures of CH4, N2, and O2 in a sample of gas were found to be 248 mm Hg, 707 mm Hg, and 518 mm Hg, respectively. What is the mole fraction of Nitrogen gas?
total pressure=248+707+518=1473mmHg
partial pressure=total pressure×mole fraction
mole fraction of N2
=partial pressure of N2/total pressure
=707mmHg/1473mmHg
=0.4800
barium can be analyzed by precipitating it as BaSO4 and determining the mass of the precipitate. When 0.269 g sample of barium compound was treated with excess H2SO4, 0.0891g BaSO4 formed. what percentage of Barium is in the compound?
Answer:
Percentage of Ba in the compound is 19.5%
Explanation:
Which element is more reactive? *
Cs
Rb
Answer:
Rubidium is a typical but very reactive member of the series of alkali metals. It is appreciably more reactive than potassium, but less so than caesium, and so would be expected to react more violently with those materials that are hazardous with potassium or sodium.
Answer:
Rb is more reactive .
Rubidium is the second most reactive metal and is very soft, with a silvery-white lustre.
..................
Mrs. McGees class is making a list of examples of how weathering and erosion changes the surface of Earth. Which of the following should NOT be on the list?
A. Breaking down rocks
B. Creating a canyon
C. Building mountains4
D. Making new soil
Answer:
Building mountains.
Explanation:
Mountains are built by land being pushed over time. Its not made by weathering and erosion!
Hope this helps! :)
Durante 50 s un cuerpo viaja a una velocidad de 18.5 m/s, ¿Qué distancia recorrió?
Answer:
Distancia = 925 metros.
Explanation:
Dados los siguientes datos;
Tiempo = 50 segundos
Velocidad = 18.5 m/s
Para encontrar la distancia recorrida;
Matemáticamente, la distancia viene dada por la fórmula;
[tex] Distancia = velocidad * tiempo [/tex]
Sustituyendo en la fórmula, tenemos;
[tex] Distancia = 18.5 * 50 [/tex]
Distancia = 925 m.
Por tanto, el cuerpo recorrió una distancia de 925 metros.
if the velocity of an object is doubled, its kinetic energy is multiplied by
Given the equation: HCl + Na2SO4 → NaCl + H2SO4, if you start with 8 moles of hydrochloric acid, how many grams of sulfuric acid will be produced?
Answer:
392g sulfuric acid are produced
Explanation:
Based on the balanced equation:
2HCl + Na2SO4 → 2NaCl + H2SO4
2 moles of HCl produce 1 mole of sulfuric acid
To solve the problem we need to find the moles of sulfuric acid produced based on the chemical equation. Then, using its molar mass -Molar mass H2SO4 = 98g/mol- we can find the mass of sulfuric acid produced:
Moles sulfuric acid:
8mol HCl * (1mol H2SO4 / 2mol HCl) = 4 mol H2SO4
Mass sulfuric acid:
4mol H2SO4 * (98g / mol) =
392g sulfuric acid are produced
A 196 mL sample of a gas at 36°C and 864 torr
is heated to 76°C and the pressure is allowed
to drop to 400 torr. What volume will the
gas
occupy at these new conditions?
Answer in units of mL.
PLEASE HELP
Answer:
A.
Explanation:
The number of ions produced when a substance dissolves is always equal to the number of Adams in a chemical formula. What is incorrect about following statement?
STOICHIOMETRY
3. Use this equation to answer the questions below: Br2 + Cl2 → 2BrCl.
a. How many moles of BrCl form when 2.74 mol Cl2 react with excess Br2?
Answer:
Explanation:
Br₂(g) + Cl₂(g) => 2BrCl(g)
excess 2.74mole ?moles
Rxn ratio is 1mole Cl₂(g) : 2mole BrCl which means the yield of BrCl must be larger mole value than the Cl₂(g) mole value. This is accomplished by multiplying the given moles Cl₂(g) by a ratio of coefficients that will make the results larger.
moles BrCl(g) produced = 2/1(2.47mole BrCl(g) = 5.48 mole BrCl(g)
When combined, two gases have a pressure of 75.54 atm. If one has has a pressure of 2.90 atm, what is the pressure of the second gas?
Your answer must me rounded to the second decimal place. (Dalton's)
Answer:
The pressureof the secondone is 2.5 atm
Explanation:
hope this helps
Plz answer will give BRAINLIEST! Promise! Question is in picture! Due in 5 minutes!!
Answer:
try A
Explanation:
DESCRIBE HOW BALANCING AN EQUATION IS SIMILAR TO COOKING.
A container of hydrogen peroxide originally has a mass of 28.96 grams and then completely decomposes into water and oxygen gas. The mass of water produced is 15.33 g. What mass of oxygen gas was also produced?
Answer:
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Write a set of rules for naming a binary molecular compound.
Answer:
Rule 1: Drop mono for the first element. Rule 2: Drop all prefixes if the first element is H. Rule 3: Drop the second o in mono prior to a vowel. Rule 4: Drop the a in prefixes ending in a prior to a vowel.
Which of these choices is the best definition of absolute dating?
A. determining the age of a rock layer by studying the fossils present
B. finding the age of an object compared to other objects
C. measuring the age of an object in years using any method
D. determining the amount of a radioactive isotope in an object
Answer:
I think it's A because the sedimentary rock is also involved in finding the fossils to determine their phenotype and their roots.
Write a balanced chemical equation for the decomposition of hydrogen peroxide (H2O2) into water and oxygen
Explanation:
Hydrogen peroxide (H2O2) when decomposes forms water and oxygen in a reaction as shown below
[tex]H_2O_2 \rightarrow H_2O + O_2[/tex]
However, this reaction is not completely balanced as number of oxygen atoms on reactant and product sides are not same
So, the complete balance equation looks like
[tex]2H_2O_2 \rightarrow 2H_2O + O_2[/tex]
3. A sample of air in a syringe exerts a pressure of 1.02 atm at 22.0°C. The syringe is placed in a boiling-water bath at 100.0°C. The
pressure is increased to 1.23 atm by pushing the plunger in, which reduces the volume to 0.224ml What was the initial volume?
Answer:
0.214 mL
explanation:
Ideal Gas law is applied to the ideal gases. The initial volume of air in the syringe when applied pressure and reducing the volume to 0.2234 mL is 0.214 mL.
What is the Ideal Gas Equation ?The equation relating all the characteristics of a gas and behaving or assuming to be ideal is the ideal gas law equation.
pV = nRT
Here, p is the pressure, V is the volume, R is the universal gas constant, n is the number of moles and T is the temperature.
According to the law, the initial and final values of gas are related as
[tex]\dfrac{P_{1} V_{1} }{T_{1} } =\dfrac{P_{2} V_{2} }{T_{2} }[/tex]
The initial pressure P₁ is 1.02 atm and final pressure P₂ is 1.23 atm.
The initial temperature T₁ is (22+273)=295 K and the final temperature (100+273)=373 K
The final volume V₂ given is 0.224 mL
Placing the values into the ideal gas equation and solving, we get the value of initial volume.
V₁= 0.214 mL
The initial volume of air in the syringe when applied pressure and reducing the volume to 0.2234 mL is 0.224 mL.
Learn more about Ideal gas law equation.
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The charge of the Fe ion in the compound FeO is blank
The charge of the Fe ions in the compound Fe2O3 is
blank
Answer:
For Feo is 2+
For Fe2O3 is 3+
Btw I did it and got it right!
Explanation:
The charge of the Fe ion in the compound [tex]\rm FeO[/tex]is +2 and the charge of the Fe ions in the compound [tex]\rm Fe_2O_3[/tex] is +3, respectively.
Ion can defined as any atom or molecule having positive or negative charge on it.
In [tex]\rm FeO[/tex]: In the compound, oxygen is in group 16 and has a charge of -2, the iron ion must have a charge of +2 to balance the charges and make the compound neutral.
In [tex]\rm Fe_2O_3[/tex]: In the compound, oxygen is in group 16 and has a charge of -2, the three oxygen atoms in [tex]\rm Fe_2O_3[/tex] contribute to a total charge of -6. To make the compound neutral, the two iron ions must have a total charge of +6. Therefore, each iron ion must have a charge of +3 to balance the charges and make the compound neutral.
Therefore, Fe ion has a charge of +2 in the compound [tex]\rm FeO[/tex] and has a charge of +3 in the compound [tex]\rm Fe_2O_3[/tex].
Learn more about ion here:
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what is the ratio of aluminum chloride to lithium sulfate
