Answer:
pH = 11.9
Explanation:
First, we determine the number of OH⁻ moles dissolved:
80% of Ca(OH)₂ is dissolved:
0.0005 mol * 80/100 = 4x10⁻⁴ mol Ca(OH)₂There are two OH⁻ moles per Ca(OH)₂ mol:
4x10⁻⁴ * 2 = 8x10⁻⁴ mol OH⁻Now we can calculate the molar concentration of OH⁻ (moles/L):
100 cm³ = 100 mL100 mL ⇒ 100/1000 = 0.1 L[OH⁻] = 8x10⁻⁴ mol / 0.1 L = 8x10⁻³ MThen we calculate the pOH of the solution:
pOH = -log[OH⁻] = -log(8x10⁻³ M) = 2.10Finally, we can calculate the pH of the solution using the equation
pH + pOH = 14pH = 14 - pOH = 14 -2.10pH = 11.9What is the mass of HF produced by three reaction of 3.0 10 to the 23 molecules of H2 with excess F2
Answer:
It is 20. g HF
Explanation:
H2 + F2 ==> 2HF ... balanced equation
Since the question is asking us to find the mass of product formed, we will want to first convert the molecules of H2 into moles of H2 (we could do this at the end of the calculations, but it's just as easy to do it now).
moles of H2 present (using Avogadro's number):
3.0x1023 molecules H2 x 1 mole H2/6.02x1023 molecules = 0.498 moles H2
From the balanced equation, we see that 1 mole H2 produces 2 moles HF. Therefore, we can now find the theoretical mass of HF produced from 0.498 moles H2:
0.498 moles H2 x 2 moles HF/1 mol H2 = 0.996 moles HF formed.
The molar mass of HF = 20.01 g/mole, thus...
0.996 moles HF x 20.01 g/mole = 19.93 g HF = 20. g HF formed (to 2 significant figures)
How does nano frabic work
Answer:
Nano silver is woven into fabric to give it anti-bacterial properties.
Explanation:
Helps by fending off the bacteria that make those clothes smell after you sweat. Nano-titanium dioxide adds sun protection to clothing just as it does in sunscreen. The use of nanoparticles to achieve fresh-smelling clothes and UV protection may not be safe.
What type of change goes on inside when a glow stick is activated?
Chemical
Physical
Both
Answer:
Chemical
Explanation:
What Most Often Causes The Availability Of Water To Change?
A. type of plants
B. type of soil
C. local geography
Answer:the answer is C
Explanation:
If an element has an atomic number of 12 how many protons does each atom have?
Why do atoms form bonds with other atoms?
SELECT ALL THAT APPLY
a
To ensure that both atoms in the bond have eight total
electrons.
b To obey the octet rule.
С
To fill the outer electron shells of both atoms.
d
To achieve a more stable electron configuration for both
atoms.
The smallest unit that combines chemically or physically to form molecules and compounds is called an atom. They are composed of electrons and protons and neutrons in the nucleus.
The correct answer is:
Option d. To achieve a more stable electron configuration for both atoms.
This can be explained as:
Atoms do not always bond to complete eight electrons in their shells.Atoms do not react to follow the octet rule.Electrons don't need to be filled in the shells of atoms of both the shells as some atoms lose electrons too.Therefore to achieve stable configuration atoms bond with other atoms.
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help me out plz!!!!
Find the density of a 720.0 g block of Titanium with these dimensions: L = 10.0 cm, W = 8.0 cm, H = 2.0 cm
El plomo y el yodo forman dos compuestos. En uno, el porcentaje de en masa de plomo es del 44,94% y en el otro es de 62,02%. Calcula los gramos de plomo por gramos de yodo en cada compuesto
Answer:
0.8162 gramos de plomo por gramo de yodo
1.633 gramos de plomo por gramo de yodo
Explanation:
Asumiendo una base de 100 gramos para cada compuesto:
Primer compuesto:
Gramos plomo: 44.94g
Gramos de yodo: 100-44.94g = 55.06g
Así, la masa de plomo por gramos de yodo para el primer compuesto es:
44.94g plomo / 55.06g Yodo =
0.8162 gramos de plomo por gramo de yodo
Segundo compuesto:
Gramos plomo: 62.02g
Gramos de yodo: 100-62.02g = 37.98g
La masa de plomo por gramos de yodo para el segundo compuesto es:
62.02g plomo / 37.98g Yodo =
1.633 gramos de plomo por gramo de yodo
Which gas is made from more than one element?
PLEASE HELP!!!!!! SpongeBob Scientific Method Practice
Mr. Krabbs wants to make Bikini Bottoms a nicer place to live. He has created a
new sauce that he thinks will reduce the amount of bodily gas that comes out after
eating krabby patties from the Krusty Krab. He brings in 100 customers that
always have gas problems. He has 50 of them (Group A) eat krabby patties with
the new "Gas-free" sauce. The other 50 (Group B) eat krabby patties with sauce
that looks just like the Gas-free sauce but is really the old sauce with food
coloring. Both groups were told that they were getting Gas-free sauce. Two
hours after eating the krabby patties, 30 customers in Group A reported having fewer
gas problems and 2 customers in Group B reported having fewer gas problems.
I
1. What is Krusty Krab's hypothesis? Krusty Krab's hypothesis is that he thinks his
new sauce will reduce the amount of bodily gas that comes out after eatin
Answer:
The hypothesis is that the new sauce used in hamburgers will be able to reduce the incidence of body gases in customers.
Explanation:
A hypothesis is an assumption about a specific topic that is being researched. In the case shown in the question above, Krusty Krab believes that the new sauce he wants to use in hamburgers is capable of reducing the amount of body gases created by the body. Krusty Krab wanted to do scientific research where he analyzed the efficiency of this new sauce, but he assumes that the new sauce is efficient in reducing the creation of these gases. This is a hypothesis.
The independent variable is the variable that you measure.
True or False?
Answer:
Maybe false
Explanation:
.........
Several important physical needs that organisms receive from the environment are:
water, minerals, carbon dioxide, and oxygen
the balance of nature, minerals, carbon dioxide, and oxygen
wind, minerals, carbon dioxide, and oxygen
Answer:
water,minerals carbon dioxide, and oxygen
Explanation:
We answered it on my little brothers quiz, and we got a 100%!!!
please show the work :(What is the estimated force applied to the box if the acceleration is .40 m/s2?
force (N) acceleration (m/s2)
10 .20
? .40
Answer:
20N
Explanation:
Given parameters:
Force(N) Acceleration(m/s²)
10 0.2
? 0.4
Unknown:
The force applied when the acceleration is 0.4m/s²
Solution:
From newton's second law of motion;
Force = mass x acceleration
Since we are using the same box, let us find the mass of the box;
Force = mass x acceleration
10 = mass x 0.2
mass = [tex]\frac{10}{0.2}[/tex] = 50kg
Now,
The force in the second instance will be;
Force = 50 x 0.4 = 20N
Microwave warming Popcorn is a  example of
A. Conduction
B. Convection
C. Radiation
D. None of these
Answer:
A
Explanation:
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True or False: Neutrons have both a positive and negative charge
Answer:
false
Explanation:
Answer:
false
Explanation:
An atom of an element has 2 electrons in the 1st energy level and 5 on the 2nd energy level what element is it ?
the element is nitrogen
5+2=7
Mrs. Moran and Mr. Moran decided to move the cabinet in their dining room. Mrs.
Moran stood on one side, and Mr. Moran stood on the other. They each pushed
with 30 N of force. What was the net force on the cabinet?
Answer:
60N
Explanation:
The net force on the cabinet is 60N.
Net force is that single force that will act like all other forces on a body. The direction of the force and magnitude is very important when resolving forces.
Force applied by Mrs. Moran = 30N
Force applied by Mr. Moran = 30N
Since they each stood on both sides and pushed, the net force will be 30N + 30N = 60N
Answer: 0
Explanation: If they both pushed a force of 30N then it doesn’t add up but instead you subtract. so it’s 0. ur yw ;)
HELP!!!!!! WILL MARK BRAINLIEST!!!
Fill in the blank.
Atoms are held together in molecules by _______.
_______ are compounds with the same chemical formula but different molecular structures.
A/An _______ indicates the ratio of atoms in a molecule.
_______ are similar to molecular formulas but show how atoms are bonded together.
When two atoms of the same element combine to form a molecule, this is called a _______ molecule.
The breaking and forming of bonds between atoms in substances results in changes in the _______ contained in the substances.
Respond to the following based on your reading.
Give two purposes for the systematic naming of chemicals.
Name the elements in the molecule H2SO4 and tell how many atoms of each element are present.
How many molecules are represented by 3CO2?
Answer:
1. Covalent Bond
2. Isomers
3. Molecular and Empirical Formula
4. The Structural Formula
5. Diatomic Molecules
1. Hydrogen and Tetraoxosulphate. There are 2 atoms of hydrogen and 4 atoms of tetraoxosulphate.
Explanation:
Sorry, I wrote all I know
Help! The products of a chemical equation are CO2 and 2H20. Which set of atoms
must make up the equation's reactants so that the equation models the law
of conservation of mass?
A. 2 C,3 O, and 4 Hg
B. 2 C,2 O, and 3 H
C. 1 Ca, 4 O, and 4 H
D. 1 C, 4 O and 4 H
Answer:
D. 1 C, 4 O and 4 H
Explanation:
a p e x, just took the quiz
According to law of conservation of mass, the set of atoms that must make up the equation's reactants is 1 C, 4 O and 4 H.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
Learn more about law of conservation of mass,here:
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Identity the solution among the following mixture-air
Answer:
Air is composed of about 78% nitrogen, 21% oxygen, and 1% of other gasses like carbon dioxide
Explanation:
Brainly deleted my answer so I came back to answer this again :(
I need help with the bottom part of the paper
Answer:
ur really pretty :)
Explanation:
when a substance melts the kinetic energy
A Decreases then increase
B Decrease
C Stays the same
D Increase
Answer:
C stays The same.
Is the answer.
Which ion has smaller size and why?Mg++ or Na+.
Answer:
Explain your answer. mg2+ would be the smaller ion this is because each ion has the same number of electrons however mg2+ has a greater number of protons and therefore is more charge dense and the outer electrons feel a greater pull from the nucleus.
Hope this helps, have a great day/night, and stay safe!
What mass of NO2 can be produced when 678 mL of oxygen at STP and 256 grams of NH3 are mixed together?
Answer:
WHT55
Explanation:
i experianced this before
How many grams are in a sample of 0.55 mol of K?
Which property do metalloids share with nonmetals?
Answer:
Both can react to form acidic compunds. Both are brittle.
Explanation:
The ghost plant is white with a single stalk. Even though it looks more like a mushroom, the ghost plant is related to blueberry plants. The ghost plant is a parasite that feeds on fungi under the ground. Ghost plant cells have all the usual plant organelles except for a .
Answer:
chloroplast
Explanation:
Ayala is making salad dressing. She mixes oil and
vinegar in a blender until a smooth consistency is
formed. Explain whether this is a heterogeneous or a
homogeneous mixture and why.
Answer:
A heterogeneous mixture
Explanation:
A heterogeneous mixture is a mixture that is not uniform in composition. This means that we can tell that there is more than one component in the mixture. An example of a heterogeneous mixture would be milk and cereal.
The opposite is a homogeneous mixture, which is uniform in composition. An example of a homogeneous mixture is air. There are many different particles surrounding us, but we can't tell.
A salad dressing that consists of oil and vinegar is another example of a heterogeneous mixture. Its consistency is smooth, but oil and vinegar can't dissolve each other, which means that we will see droplets of oil and vinegar. Since we can tell that it contains these components, this is a heterogeneous mixture.
Answer:
Sample Response: A homogeneous mixture can only form when one of the substances can dissolve the other one. Oil and water cannot dissolve each other, so they must form a heterogeneous mixture with small particles of vinegar dispersed throughout the oil, yet not dissolved.
When is the potential energy transformed into kinetic energy?
When it is in motion, i.e no longer stopped
Explanation:
If a ball is lifted to a certain height, it gains potential energy. If it is then dropped, the potential energy is converted into kinetic energy as it looses height but gains speed.