Answer:
the fractions obtained are not of acceptable purity
Explanation:
What is the molarity of a HCl solution, if 28.6 mL of a 0.175 m NaOH solution is needed to neutralize a 25.0 mL sample of the HCl solution
The molarity of the HCl solution needed to neutralize 28.6 mL of a 0.175 M NaOH solution is 0.2002 M
We'll begin by writing the balanced equation for the reaction. This is given below:
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
The mole ratio of the acid, HCl (nA) = 1
The mole ratio of the base, NaOH (nB) = 1
From the question given above, the following data were obtained:Volume of base, NaOH (Vb) = 28.6 mL
Molarity of base, NaOH (Mb) = 0.175 M
Volume of acid, HCl (Va) = 25 mL
Molarity of acid, HCl (Ma) = ?The molarity of the acid, HCl can be obtained as follow:
MaVa / MbVb = nA / nB
(Ma × 25) / (0.175 × 28.6) = 1
(Ma × 25) / 5.005 = 1
Cross multiply
Ma × 25 = 5.005
Divide both side by 25
Ma = 5.005 / 25
Ma = 0.2002 MTherefore, the molarity of the acid, HCl needed for the reaction is 0.2002 M
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How does melting order relate to melting point?
A. The substance that melted the quickest has the highest melting point.
B. The substance that took the longest to melt has the lowest melting point.
C. The substance that melted third to last has the lowest melting point.
D. The substance that took the longest to melt has the highest melting point.
Answer:
I think A.
Explanation:I say A because of the substance melting the quicking does have the highest melting point because its the highest.
Which of the following is NOT an example of a communicable disease.
The none communicable disease in the given option is diabetes
What is a communicable disease?A communicable disease is a type of disease that can be spread from one person to another.
Examples of communicable diseases include;
HIV, Hepatitis (A, B, C) Measles, TuberculosisInfluenzaCommon coldThus, the none communicable disease in the given option is diabetes.
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What types of bonds, and how many bonds, do you predict arsenic form with other elements?
Answer:
The outer-shell similarity of the two elements suggests that arsenic, like phosphorus, can form three covalent bonds per atom, with an additional lone pair of electrons left unbonded.
Atomic number: 96
Oxidation states: +3, +4
Arsenic atom can form either three or five bonds in arsenic compounds.
The number of bonds that an element will form to other elements depends on the number of electrons on the valence shell of that element. Arsenic has five valence electrons on its valence shell.We know that there is one lone pair on the valence shell of arsenic hence, the arsenic atom can form either three or five bonds in arsenic compounds.In conclusion, arsenic is an element that could form three or five bonds in its compounds.
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2. What physical force causes suspensions to settle
Hello!
Answer:
Gravity
Explanation:
It can settle down and separate over time due to gravity.
Hope this helps! Have a great day!
Which three things does a plant need to create a glucose molecule in photosynthesis?
Choose all correct answers.
water
oxygen
carbon dioxide
sunlight
how many moles of iron are present in 3.15 × 10^24 atoms of iron?
Answer:
5.23 moles
Explanation:
How many moles of iron are present in 3.15 × 10^24 atoms of iron?
1 mole has 6.02 X 10^23 particles
so
3.15X10^ 24 atoms =( 3.15 X 10^24)/(6.02 X 10^23) =(3.15/6.02 )X 10 =
5.23 moles
Explain why reaction speed increases with temperature.
What is Art Conservation?
Answer:
The conservation and restoration of cultural property focuses on protection and care of cultural property, including artworks, architecture, archaeology, and museum collections. Conservation activities include preventive conservation, examination, documentation, research, treatment, and education
Explanation:
this is the correct answer
What was the effect of increasing the water's mass?
how long to bring cream cheese to room temperature?
Answer:
about an hour but it might take a little longer it jist depends
27/13Al how many electron does one atome of this element contain
Answer:
An aluminium atom contains 13 electrons.
Compare the box on the left containing the reactants in a chemical reactions. Which box on the right is the correctly represents the products according to the Law of Conservation of mass?
A) A.
B) B.
C) C.
D) D.
Answer:
d is the right answer
please mark me brainlist
EASY QUESTION (PLEASE HELP THE INTERNET ISN'T SUCH A BIG HELP RIGHT NOW)
Things microscopes have helped scientists discover about cells.
(No links plz)
Answer:
Adding on to the answer said before, microscopes are pretty much one of the most significant tools used in Biology. It helped discover organelles, and smaller stuff like DNA, and prominently allowed Scientists to discover Bacteria and Archaea, the prokaryotic cells that contribute a big role in the functioning of soil, which is essential for our ecosystem.
mixture requires constant shaking to keep its constituents combined. It is best described as a _____.
homogenous mixture
colloid
suspension
solution
Answer:
[tex] \tiny \tt \: [/tex]
Suspension
82. How many moles of calcium are in 3.82g of calcium?
I NEEEED HEEELPPEPEPEPEPEPPE
chemical equations for sodium sulphate, potassium sulphate, magnesium sulphate, calcium sulphate
Explanation:
2NaOH + H2SO4 --> Na2SO4 + 2H2O
2KOH + H2SO4 --> K2SO4 + H2O
Mg(OH)2 + H2SO4 --> MgSO4 + 2H2O
Ca(OH)2 + H2SO4 --> CaSO4 + 2H2O
Will this reaction occur?
Ni (s) + H,O(1)
1
Yes
No
What will be the primary result of the continuation of the
geologic processes indicated at this location?
Earth's magnetic field will reverse direction.
New oceanic crust will form.
o Continental crust will be forced downward.
Earth's circumference will increase.
Answer:
B
Explanation:
new oceanic crust will form.
The formation of a new oceanic crust will be the primary result of the continuation of the geologic processes. Therefore, option (B) is correct.
What is the oceanic crust?The oceanic crust can be described as the uppermost layer of the oceanic portion of the tectonic plates. The oceanic crust is composed of the upper oceanic crust, with pillow lavas complex, and the lower oceanic crust, made of troctolite, and ultramafic cumulates.
The oceanic crust lies above the rigid uppermost layer of the mantle. The crust and the rigid upper mantle layer together compose the oceanic lithosphere.
The oceanic crust is rich in iron and magnesium and composed of mafic rocks. It is thinner than the continental crust less than 10 Km thick but it is denser with 3.0 g/cm³ as opposed to the continental crust.
The oceanic crust displays a symmetrical pattern of positive and negative magnetic lines emanating from the mid-ocean ridge.
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What is the density of a bowling ball with a mass of 3.0 kg and a volume of 0.0050 m 3 ?
0.002 kg/m 3
0.015 kg/m 3
500 kg/m 3
600 kg/m 3
Answer:
600 kg/m³
Explanation:Formula to used = m/v
[] d is the density
[] m is the mass
[] v is the volume
Solving[Formula] d = m/v
[Plug-in] d = 3/0.0050
[Divide] d = 600 kg/m³
Answer0.002 kg/m³
0.015 kg/m³
500 kg/m³
600 kg/m³
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
Answer:
[tex]\boxed {\boxed {\sf 600 \ kg/m^3}}[/tex]
Explanation:
We are asked to find the density of a bowling ball. The density of an object is its mass per unit volume. It is calculated by dividing the mass by the volume.
[tex]\rho= \frac{m}{v}[/tex]
The mass of the bowling ball is 3.0 kilograms and the volume is 0.0050 cubic meters.
m= 3.0 kg v= 0.0050 m³Substitute the values into the formula.
[tex]\rho= \frac{3.0 \ kg}{0.0050 \ m^3}[/tex]
Divide.
[tex]\rho= 600 \ kg/m^3[/tex]
The density of the bowling ball is 600 kilograms per cubic meter.
the number of neutrons in the nucleus of an atom can be determined by
Answer:
To calculate the number of neutrons, subtract the atomic number (which equals the number of protons) from the mass number.
hope this helps☆☆☆
Based on the periodic table, what is the oxidation number of oxygen (Group VI, period 2) in compounds? a) 0 b) +2 C) -2 d) 1
The oxidation number of oxygen (Group VI, period 2) is -2.
The electrical charge of an atom describes its Oxidation number.\The number of electrons that must be gained or lost in an atom's valence electron shell to make it to be filled or half-filled gives us the oxidation number value.When the atom gains electrons,it acquires a negative oxidation number. When the atom loses electrons,it acquires a positive oxidation number
Oxygen has 8 electrons with {He] 2s² 2p⁴ configuration. With 6 electrons in its valence shell, it need to gain 2 electrons to achieve stability, When it gains 2 electrons, it acquires a negative oxidation number of -2.
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please help me with the second image questions it is really important and I really need it please help me out and provide me the answers for the second image two questions, looking at the first image please.
Answer:
is this exam.. are you coping..
Why is seawater and corn syrup denser than the egg? explain plz no link
do not delete i just need help
Answer:
A. prokaryotic cell
Explanation:
We can easily identify the diagram as prokaryotic cell by the capsule shown. These organisms mostly have capsules.
please help for a brainlist
Answer:
Is D
Explanation:
hope this is helpful
How much mass does 1 mol of O2 gas have?
Answer: 15.99 x2g
Explanation:
the enthalpy of combustion of gasoline is about 45 kj/g. the amount of energy needed to heat 1 g of water from 20 °c to 100 °c is 80 °c x 4.18/g•°c. the enthalpy of vaporization of water is 2540 j/g. what mass of water at 20 °c can 1 g of gasoline heat and boil?
The mass of water that can be boiled by 1 g of gasoline by raising its temperature from 20 °c to 100 °c is 17.6 g.
Now, we know that energy can not be created nor destroyed but it can be converted from one form to another.
The heat produced by the gasoline is equal to the heat gained by water. Mathematically;
1g × 45 × 10^3 = [1 g × 4.18 × (100 - 20) + 2540m]
45 × 10^3 = 334.4 + 2540m
45 × 10^3 - 334.4 = 2540m
m = 45 × 10^3 - 334.4 /2540
m = 17.6 g
The mass of water that can be boiled by 1 g of gasoline by raising its temperature from 20 °c to 100 °c is 17.6 g.
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Vinegar is an ingredient commonly used by chefs. Scientists also use it as well, although they call it acetic acid. When vinegar is in its liquid or solid (frozen) states, it has a fixed volume. But when vinegar is in its gas state, it takes up the entire volume of whatever container it is in. This is why you can smell an open bottle of vinegar the minute you walk into a kitchen, even though you cannot actually see the gas particles!
Which statement best explains why the volume of vinegar gas is changeable as opposed to the fixed volume of its solid and liquid states?
A. Gas particles are always at a higher pressure than solids and liquids.
B. Gas particles are always at a higher temperature than solids and liquids.
C. Gas particles are spaced far apart and can move freely.
D. Gas particles stay close together but can move around each other.
Answer: C
Explanation: Because gas particles are free to move fast where as liquid can move a little but solid cant so it would be C
Hope it helps
how many electrons does hydrogen need in order to have a full shell of valence electrons?
Answer:
One
Explanation:
In a hydrogen atom, the first outer shell only consists of two valence electrons, because it would already have one, the atom only needs one more.
It requires two electrons to completely occupy its outer shell, it frequently forms a single covalent bond with another atom. Because of this configuration, hydrogen can gain access to two electrons and completely occupy its valence shell.
What is Hydrogen?Hydrogen adheres to the duet rule because it only requires two electrons to completely occupy its valence shell. It deviates from the octet rule. Hydrogen only needs to form one bond. Because of this, H is always a terminal atom and never a central atom. Hydrogen is a chemical element with the symbol H and the atomic number 1.Hydrogen is the lightest element. Under normal conditions, hydrogen is a gas of diatomic molecules with the formula H2. It is colorless, odourless, tasteless, non-toxic, and extremely flammable. Hydrogen is a more environmentally friendly alternative to methane, also known as natural gas. It is the most abundant chemical element, accounting for 75% of the universe's mass. Water, plants, animals, and, of course, humans contain massive amounts of hydrogen atoms.To learn more about valence electron refer to:
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