Answer:
a) pH = 11.5
b) pH= 3
Explanation:
a) lets calculate the number of moles of each reactant
moles of HCl = 32/1000 * 0.32 = 0.01024 mole
moles of NaOH = 42/1000 * 0.32 = 0.01344 moles
1 moles of HCl reacts with 1 moles of NaOH , so 0.01024 mole of HCl should react with 0.01024 moles of NaOH , but there is some excess NaOH.
excess NaOH= 0.01344 -0.01024 = 0.0032 moles
[H+]= [tex]\frac{10^{-14} }{0.0032} = 3.125 *10^{-12}[/tex]
pH= -log [3.125*10^-12) = 11.5
b) moles of NaOH = 0.00924
excess HCl present = 0.01024 - 0.00924 =.001
so excess [H+] = 0.001
pH= -log( 0.001) = 3
Waters density is 1 g/cm^3. Glass has a density of 2.8 g/cm^3. Will glass float in water?
YES, it will float because its density is greater than the density of water/
This question cannot be answered because density does not determine buoyancy
NO, it will not float because its density is greater than the density of water
Explanation:
It will not float on water
Substances with their densities less than that of water usually float on it and those with their densities greater than that of water will sink into it.
From the question the density of glass is 2.8 g/cm³ and this is greater than the density of water which is 1 g/cm³. Therefore glass will not float on water.
Hope this helps you
which si unit would be most appropriate for describing the lengeth of the shoe?
Elements in a vertical column on the Periodic Table have similar properties and are all members of the same
of elements.
Answer:
ok thx for the imformation can you help me with my qustion
Explanation:
Due to their comparable chemical activity, the periodic table's vertical columns are referred to as groups or families. The number of valence electrons and chemical characteristics are the same for all members of a family of elements.
What is properties in vertical column on the Periodic Table?The vertical columns of the periodic table also have a unique name. A group is what we call each column.
Each set of elements has an equal number of electrons in the outer orbital. The outer electrons are sometimes referred to as valence electrons.
The same valence shell electron arrangement gives the elements in the same group comparable chemical characteristics.
Because the valence shell electron configuration of the elements changes gradually along the row, the elements exhibit a gradual change in their chemical characteristics.
Therefore, elements in a vertical column on the Periodic Table have similar properties.
Learn more about similar properties here:
https://brainly.com/question/5087000
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Which is an example of the electromagnetic force?
- A compass needle points north toward earths magnetic pole
- An iron nail rolls off a table and falls to the ground
- the moon pulls on the water in earths oceans, causing tides
- protons that make up a nitrogen atom stays together in the nucleus
Answer:
The correct Answer is A.
proof below <3
What are the 3 ways that heat can transfer?
Answer:
Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation).
Explanation:
Answer:
Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation). Heat is usually transfered in a combination of these three types and seldomly occurs on its own.
Explanation:
hope this helps u.
3. Carbon -14 underwent radioactive decay and emitted beta particles.
a. Write an equation to represent this process
?
The decay reaction of Carbon-14 which releases Beta particles, resulting in the element Nitrogen-14
Further explanationRadioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,
alpha α particles ₂He⁴ beta β ₋₁e⁰ particles gamma particles ₀γ⁰ positron particles ₁e⁰ neutron ₀n¹Carbon-14 emits beta β ₋₁e⁰ particles , so the atomic number increases by 1, the mass number remains the same
Reaction
[tex]\tt \large{\boxed{\bold{_6^{14}C\rightarrow _7^{14}N+_{-1}^0e}}[/tex]
At which temperature could air hold the most water vapor?
Answer:
Now, what happens if we turn the room thermostat up to 80 degrees F? Looking at your Capacity of Saturated Air table, you can see that as air temperatures rise, there is an increase in the ability of the air to hold moisture. At 80 degrees F the capacity of air increases to where it can hold 21.537 g/kg of water vapor.
Explanation:
Answer: At 80 degrees F the capacity of air increases to where it can hold 21.537 g/kg of water vapor.
Explanation:
5. If a farmer has a corn crop and a herd of cows, which energy resource 20 poin
is the farmer most likely to use? *
O A. Geothermal
B. Biomass
C. Wind
D. Hydropower
I need y’all’s help xD please help <3 15 points ; )
Answer:
Biomass
Explanation:
It is Biomass because biomass is a Renewable and organic energy that is gotten from living things to generate sustainable electric energy. The farmer with corn and herds of cows has biomass energy resources because it is gotten from living things both plants and animals. The materials use for biomass gotten from plants and animals are woods, barks, straw, animals dung,gases produced by animals e.t.c.
Calculate the nuclear binding energy in mega-electronvolts (MeV) per nucleon for Th232. Th232 has a nuclear mass of 232.038 amu.
Answer:
1720 MeV
Explanation:
Thorium has 90 protons and 142 neutrons
The mass of each proton is 1.007277 amu
The mass of each neutron is 1.008665 amu
The mass of 90 protons is 90 * 1.007277 amu = 90.65493 amu
The mass of 142 neutrons is 142 * 1.008665 amu = 143.23043 amu
Total calculated mass of nucleons = 90.65493 amu + 143.23043 amu = 233.88536
Mass defect = 233.88536 amu - 232.038 amu = 1.84736 amu
We convert from amu to MeV using the conversion factor of 931
Binding energy = 1.84736 amu * 931 = 1720 MeV
1. Which of these is true of all animals?
O A. They are producers.
B. They are unicellular.
C. They are multicellular.
D. They reproduce asexually.
Other:
Is water made of matter. Yea or no. Thanks everyone for your help
Answer:
yes
Explanation:
because it can take up space and it is a liquid and that is one of the three states of matter :]
How many grams of chromium(II) sulfate, , must be dissolved to prepare 500. mL of a 0.219 M aqueous solution of the salt?
How does an object become electrically charged?will give brainliest
Though the transfer of charges from one object to another
Through the movement of heat from one object to another
Through the transfer of sound from one object to another
Through the movement of water from one object to anoth
Answer:
It is Though the transfer of charges from one object to another, or (A).
How many moles of carbon (C) are there in 92.5 g of C?
Answer:
c are there 93.5 of c yan siguro
A fossil that looks like a spiral or a rams horns
Answer:
Explanation:
ammonite
Answer:
Ammonite
Explanation:
These are some awesome fossils
Plz mark B R A I N L I E S T
Please help me with this
Answer:
b
Explanation:
Electrons have negative charges and Protons have positive.
you can remember this by (Pro)ton = (Pos)itive
The pH of a solution of 3-hydroxypropanoic acid is measured to be . Calculate the acid dissociation constant of 3-hydroxypropanoic acid. Be sure your answer has the correct number of significant digits.
Answer:
3.1 × 10⁻⁵
Explanation:
The pH of a 0.53 M solution of 3-hydroxypropanoic acid (HC₃H₅O₃) is measured to be 2.39. Calculate the acid dissociation constant of 3-hydroxypropanoic acid. Be sure your answer has the correct number of significant digits.
Step 1: Given data
Concentration of 3-hydroxypropanoic acid (Ca): 0.53 MpH of the solution: 2.39Step 2: Write the acid dissociation reaction
3-hydroxypropanoic acid is a weak acid that dissociates according to the following equation.
HC₃H₅O₃(aq) ⇄ C₃H₅O₃⁻(aq) + H⁺(aq)
Step 3: Calculate the concentration of H⁺
We will use the definition of pH.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -2.39 = 4.07 × 10⁻³ M
Step 4: Calculate the acid dissociation constant (Ka) of 3-hydroxypropanoic acid
We will use the following expression.
Ka = [H⁺]² / Ca
Ka = (4.07 × 10⁻³)² / 0.53
Ka = 3.1 × 10⁻⁵
What do you think it is?
What type of atoms form covalent bonds?
Answer: :)
Explanation:
In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom
Answer:
In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.
Explanation:
Which action would shift this reaction away from solid calcium fluoride and toward the dissolved ions?a) adding calcium ionsb) adding fluoride ionsc) removing fluoride ionsd) removing calcium fluoride
Answer:
c) removing fluoride ions.
Explanation:
Hello!
In this case, for this solubility product problem, it is very convenient to write the undergoing ionization reaction:
[tex]CaF_2(s)\rightleftharpoons Ca^{2+}(aq)+2F^-(aq)[/tex]
In such a way, via the Le Chatelier's principle, we remember that the addition of reactants shifts the reaction towards products, adding products shifts the reaction towards reactants, removing reactants shifts the reaction towards reactants and removing products shifts the reaction towards products. In means, that the best way to shift this reaction away from solid calcium fluoride and toward the dissolved ions is c) removing fluoride ions, because it is a product and its removal favors the formation of more products.
Best regards!
please help quick will give brainliest
Answer:
I think it's Physical, Chemical, then Physical
Explanation:
I hope I'm right, those answers sound about right to me
Please solve quickly!!!
Answer:
18 oxygen atoms
Explanation:
in order to from the 6 molecules carbon dioxide and 6 molecules of water you will have a total of 18 oxygen atoms
The Beryllium (Be) atom is smaller than the Barium (Ba) atom. Choose the evidence statement that best supports this claim. A Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 8 electron shells. A Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 8 electron shells. A Beryllium (Be) atom has 3 electron shells, whereas a Barium (Ba) atom has 8 electron shells. A Beryllium (Be) atom has 3 electron shells, whereas a Barium (Ba) atom has 8 electron shells. A Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 6 electron shells. A Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 6 electron shells. A Beryllium (Be) atom has 1 electron shells, whereas a Barium (Ba) atom has 6 electron shells.
Answer:
A Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 6 electron shells
Explanation:
Beryllium (Be) is an element in group two of the periodic table with atomic number 4 (Is2 2s2). On the other hand, barium (Ba) is an element in group 2 of the periodic table with atomic number 56. However, as stated in the question, the Beryllium (Be) atom is smaller than the Barium (Ba) atom.
This is because a Beryllium (Be) atom has 2 electron shells, whereas a Barium (Ba) atom has 6 electron shells. The electron shells of Barium contains more electrons, which is responsible for the large size of the Barium atom. Note that, the higher the number of atoms, the larger the atomic size.
How do materials move into and out of a cell?
Answer:
Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.
Explanation:
Answer:
Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.
20 POINTS HURRY!!!
A relationship in which one species benefits and the other is harmed is
A. mutualism.
B. cooperation.
C. commensalism.
D. parasitism.
Answer:
C. commensalism.
Explanation:
Here is the answer
Answer: THE ANSWER IS A
Explanation:
Explain what is cellular growth and repair? Why is it important?
Answer:
Cell growth usually refers to cell proliferation, the increase in cell numbers that occurs through repeated cell division. Cell growth can also refer to the enlargement of cell volume, which can take place in the absence of cell division. As living things grow, some cells die or become damaged and need replacements. Some single-celled organisms use a type of mitosis as their only form of reproduction. In multicellular organisms, cell division allows individuals to grow and change by expanding the number of total cells.
Hope this helps!!!
Is ice a food or a drink
Answer:
a drink my guy
Explanation:
just frozen
A sample of He collected over water at a temperature of 20C has a pressure of 705 torr. What is the pressure of the dry gas? The vapor pressure of water at 20 degrees * C is 17.5 torr.
The pressure of the dry gas : 687.5 torr
Further explanationDalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
The partial pressure is the pressure of each gas in a mixture
Since the gas mixture consists of He and H₂O :
P tot=P He + P H₂O
[tex]\tt 705=P~He+17.5\\\\P~He=705-17.5=687.5~torr[/tex]
PLEASE HELP QUICKLY THANK YOU
Answer:
the answer is A
Explanation:
since during a cold front the cold air replaces the warm air
Answer:
during a cold front, cold air mass is replaces a warm air mass.
Explanation:
hope this helps
Which term refers to the process by which land is worn away by natural forces or human activity
I will mark brainliest
Answer:
The answer is A. Erosion
Explanation:
Took the quiz
Answer:
A- erosion
Explanation:
Erosion occurs when water, wind, or ice removes soil and rock and deposits it in a new area.
Occurs naturally, but is also impacted by human activity.
Caused by farming, deforestation, and building roads and cities.
