Answer:
by statistical analyses, especially by determining the p-value
Explanation:
In general, observations and results obtained from experimental procedures are subjected to a statistical test to check the robustness of the working hypothesis. The p-value is the most widely used statistical index in order to test such observations and results. The p-value is the statistical probability of obtaining extreme observed results when the null hypothesis is considered correct. A p-value lesser than 0.05 generally is considered statistically significant and then the null hypothesis can be rejected. In consequence, a very low p-value (which is obtained by statistical analysis of the observations and results), indicates that there is strong evidence in support of the alternative hypothesis.
Question 4 of 5
Zinc (Zn) combines with hydrogen chloride (HCI) to form
hydrogen gas (H2) and zinc chloride (ZnCl2).
Which equation represents this chemical reaction?
A. ZnCl2 + Zn - H2 + 2HCI
B. Zn - H2 + ZnCl2 + 2HCI
C. Zn + 2HCI - H2 + ZnCl2
D. 2HCl - H2 + Zn + ZnCl2
Answer:
Required Answer:-First rewrite the sentence that defines the equationZinc (Zn) combines with hydrogen chloride (HCI) to form hydrogen gas(H2) and zinc chloride (ZnCl2).
Chemical Equation[tex]\sf Zinc+Hydrogen\:Chloride \longrightarrow Hydrogen\:gas+Zinc\:Chloride[/tex]
Now write the equation[tex]\sf Zn+HCL \longrightarrow H_2+ZnCl_2 [/tex]
Balance[tex]\sf Zn+2HCL\longrightarrow H_2+ZnCl_2 [/tex]
option C is correctAnswer:
Explanation:
Answer is C
5. You add 11.00 mL of 0.800 M NaOH to 50.00 mL of pure water, and to this mixture you then add 3.00 mL of 0.200 M HCl. What will be the pH of the resulting solution
Answer:
pH = 13.11
Explanation:
NaOH reacts with HCl to produce H2O and NaCl. pH depends of this reaction. The reactant in excess determine the pH of the solution:
NaOH + HCl → H2O + NaCl
1 mole of NaOH reacts with 1 mole of HCl
To determine limiting reactant we need to find moles of each reactant:
Moles NaOH:
0.011L * (0.800 mol / L) = 0.0088 moles NaOH
Moles HCl:
0.003L* (0.200mol / L) = 0.0006 moles HCl
That means limitng reactant is HCl and moles in excess of NaOH are:
0.0088moles NaOH - 0.0006 moles = 0.0082 moles NaOH =
0.0082 moles OH⁻
In 11.00mL + 50.00mL + 3.00mL = 64.00mL = 0.06400L
[OH-] = 0.0082 moles OH- / 0.064L = 0.1281M OH-
pOH = -log [OH-] = 0.89
pH = 14 - pOH
pH = 13.11You complete titration of 15.0ml of unknown acid with 14.16ml of 1.25 M NaOH. What’s the molar it’s of the unknown acid? Assume the acid is monoprotic 1 mole of acid reacts with 1 mole of base.
The molarity of the unknown acid : 1.18 M
Further explanationTitration is a procedure for determining the concentration of a solution by reacting with another solution that is known to be concentrated (usually a standard solution). Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range
Titration formula
M₁V₁n₁=M₂V₂n₂
monoprotic acid⇒n₁=1
NaOH monoprotic base⇒n₂=1
[tex]\tt M_1\times 15=1.25\times 14.16\\\\M_1=1.18~M[/tex]
During the reaction: Mg(s) + CuSO4(aq)
es)
MgSO4(aq) + Cu(s), what changes occur to magnesium?
A)Its oxidation number changes from +2 to 0 and it is reduced.
B)Its oxidation number changes from 0 to +4 and it is reduced.
C)Its oxidation number changes from 0 to +2 and it is oxidized.
D)Its oxidation number changes from +2 to +4 and it is oxidized.
Answer:
C
Explanation:
I did it on usatestprep
Which of the following is an example of erosion?
water freezing inside the cracks of rocks
stalactite and stalagmite formation in caves
plant roots pressing against the sides of rocks
glaciers moving rocks and soil through a valley
Answer:
Glaciers moving rocks and soil through a valley
Explanation:
The definition of Erosion is "the process of eroding or being eroded by wind, water, or other natural agents". Which in turn means the movement of glaciers is causing erosion on the local valley.
the last one
Explanation:
Scientists are studying ways to improve the efficiency of solar cells by studying a process called photon upconversion . In this process , the energy of two photons can become combined to form a new photon with an energy equal to the sum of the two combined photons . With this process , abundant infrared radiation can be converted into visible light that can be used by solar celis to produce electricity . Suppose an infrared photon with a wavelength of 853 nm were combined with another infrared photon with a wavelength of 935 nm , what would be the wavelength of the new 'combined photon , in nm ?
Answer:
λ = 4.46 x 10⁻⁷ m = 446 nm
Explanation:
Applying Law of Conservation of Energy in this condition, we will get the following equation:
Total Energy of Combined Photons = Energy of 1st Photon + Energy of 2nd Photon
hc/λ = hc/λ₁ + hc/λ₂
hc/λ = hc(1/λ₁ + 1/λ₂)
1/λ = 1/λ₁ + 1/λ₂
where,
λ = wavelength of combined photon = ?
λ₁ = wavelength of 1st photon = 853 nm = 8.53 x 10⁻⁷ m
λ₂ = wavelength of 2nd photon = 935 nm = 9.35 x 10⁻⁷ m
Therefore,
1/λ = 1/(8.53 x 10⁻⁷ m) + (9.35 x 10⁻⁷ m)
1/λ = (0.1172 x 10⁷ m⁻¹) + (0.1069 x 10⁷ m)
1/λ = 0.2241 x 10⁷ m⁻¹
λ = 1/(0.2241 x 10⁷ m⁻¹)
λ = 4.46 x 10⁻⁷ m = 446 nm
Answer:
446
Explanation:
What does a detergent do to water to help the bubbles last
Answer:
Detergent lowers the surface tension of water enough so that bubbles can form. ... Glycerin makes stronger, longer-lasting bubbles, but corn syrup is often substituted in bubble solutions because it is cheaper.
Explanation:
Hope this helps.
It reduces the [surface] tension of the water to form bubbles
Which of the following aspects of biotechnology is not considered to be a moral or ethical issue
The question is incomplete, the complete question is;
Which of the following aspects of biotechnology is Not considered to be a moral or ethical issue?
a.research and testing on animals
b.cloning living material
c.reducing research cost
d.damaging the environment
Answer:
c.reducing research cost
Explanation:
Ethical issues arise when a particular course of action is at odds with the generally acceptable moral standard in the society.
Research and testing on animals is contested as an ethical issue by animal rights activists.
Cloning living material is prohibited among some sections of society and is also being contested as an ethical issue.
Damaging the environment the environment owing to biotechnology research is generally regarded as an ethical issue.
However, reducing research cost is highly acceptable in any research. It does not pose an ethical issue.
The density of magnesium is 1.7/cm3, and the density of iron is 7.9g/cm3. Consider a block of iron with a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?
Hey yalll ok so like I need help & this is science or chemistry or whatever yall would like to call it! Can yall help me? I am having problems with this and I dont understand this so if yall could help me that would be Wonderfulllll! <3
Answer:
ill help but i cant see the problem
Explanation:
Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4?
Answer:
18.33 ×10²³ atoms
Explanation:
Given data:
Molar mass of sulfuric acid = 98.1 g/mol
Mass of sulfuric acid = 75.0 g
Number of of oxygen atom present = ?
Solution:
Number of moles of sulfuric acid:
Number of moles = mass/molar mass
Number of moles = 75.0 g/ 98.1 g/mol
Number of moles =0.761 mol
one mole of sulfuric acid contain four mole of oxygen atom.
0.761 mol × 4 = 3.044 mol
1 mole = 6.022×10²³ atoms of oxygen
3.044 mol × 6.022×10²³ atoms of oxygen / 1mol
18.33 ×10²³ atoms
Sugar(C6H1206) and salt( NaCl) are examples of
Answer:
compounds
Explanation:
It is a substance formed when two or more. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.
Answer:
Brain big big brain
Explanation:
Biggest brain small brain Big brain big stonks
Question 24 (3 points)
Choose the element below that has correct information about the number of energy
levels/orbitals: (Use a period table to answer this question).
Lithium (Li) has one energy level
Sodium (Na) has three energy levels
Potassium (K) has three energy levels
Fluorine (F) has seven energy levels.
Answer:
sodium
Explanation:
all matter has physical and chemical properties. These properties can be used to identify the type of matter. Which of these statements describe a physical property?
Explanation:
Physical properties of matte tells us everything about a substance when no change is occurring to its constituents.
Such properties are best observed with our senses. Also, physical properties can be observed using equipment in the laboratory or some apparatus.
Examples of these properties are state of matter, color, odor, taste, texture, hardness, solubility in water, melting point, boiling point, density, viscosity and spectroscopic patterns.The doctor ordered 300 mg of clopidogrel P.O. STAT.the drug on hand is clopidogrel 75 mg/ TAB. How many tablets are you going to give to your patients?
Answer:
You would give four tablets of clopidogrel 75 mg/TAB STAT.
Which number represents an acidic pH, 4 or 9? _______ Numerical Answers Expected! Answer for Blank 1:
Answer:
4
Explanation:
pH scale of acidic is 4.
Answer: 4
Explanation:
Question 23 (1 point)
A student is given an object with a mass of 14.8 grams. When placed into a
graduated cylinder the water level rises from 25.0 mL to 34.7 mL.
What is the density of the object and would you expect it to float or sink in the
graduated cylinder if water has a density of 1.00 g/mL? Show all of your work.
Answer:
d = 1.53 g/mL
Object will sink into water
Explanation:
Given data:
Mass of object = 14.8 g
Initial volume of water = 25.0 mL
Final volume after adding object = 34.7 mL
Density of object = ?
Density of water = 1.00 g/mL
Solution:
Volume of object = Total volume - volume of water
Volume of object = 34.7 mL - 25.0 mL
Volume of object = 9.7 mL
Density of object;
d = mass/volume
d = 14.8 g / 9.7 mL
d = 1.53 g/mL
The density of water is 1.00 g/mL which means object is heavier than water thus object will sink into the water. The object with density less than water are float in it.
What is the number of neutrons in Hydrogen, O (A= 1, Z= 1)?
Answer:
Explanation:
Hydrogen has 1 proton and one nuetron
Oxygen has 8 protons nad 8 neutrons
Why do atoms form ionic and covalent bonds?
Explanation: an ionic bond, is when a atom basically gives a electron to another, forms when one atom becomes stable by losing its outer electrons and the other atoms become stable by gaining the electrons covalent bonds form when sharing atoms results in the highest stability possible
Which of the following practices can help control erosion?
recycling paper
harvesting earlier
tree removal
contour plowing
Answer:
Contour plowing
Explanation:
Contour plowing is one of the activity that can help control the rate of erosion in a given place.
Erosion is the washing away of the layer of the earth. In agricultural practices, rich top soil can be eroded if adequate measures are not taken. Contour plowing is the process of planting along the sides of a ridge following the contour patterns. This helps to break down slopes and reduce erosion.Which subatomic particles are stolen and/or shared when atoms bond together during a chemical reaction?
A. protons
B. Subatomic particles are not involved in atomic bonding
C. neutrons
D. electrons
Answer:
D. electrons
Explanation:
Chemical bonds occur as a result of electrons (negatively-charged subatomic particles) being transferred among atoms. The transfer happens when electrons are being stolen or shared from an atom to another. The reason behind this is because atom's atomic shells are naturally inclined to be full. Thus, if one atom has extra electrons, that atom will most likely share his electrons to another atom lacking in it.
An atom of oxygen has six valence electrons. In nature, oxygen is a diatomic molecule and is usually found in the form O2. Why would one atom of oxygen want to bond with another one?
A) When the oxygen atoms bond together, they become ionized.
B) The transfer electrons to each other so they both have a full shell of valence electrons.
C) When oxygen atoms share electrons the outer shell of electrons is filled and each atom becomes more stable.
D) A single atom of oxygen is very stable and simply joins with another oxygen in order to destabilize both of them.
Answer:
I think the answer is B
Explanation:
Answer:
oxygen atom is a unstable atom so it gets attached to other oxygen atom sharing valance electrons to become stable
C is the right ans
Calculate the percent yield of (4-chlorophenyl)bis(4-methoxyphenyl)methanol if the actual isolated mass is 0.15 g.
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, in order to calculate the percentage yield of an extraction/isolation, the formula to be used is below
percent yield = isolated mass/total mass × 100
The mass of the yield (which can also be referred to as isolated mass) was provided to be 0.15 g but the total mass of the (4-chlorophenyl)bis(4-methoxyphenyl)methanol was not provided.
In the completed question that has the total mass or the values to obtain the total mass, the formula mentioned earlier should be used.
Which of the following describes the location and energy of all the valence electrons
of electrically-neutral sulfur (S)?
3p4
3s23p4
Зрб
3523pó
Answer:
1s22s22p63s23p4
Explanation:
Sulfur is located in the p block and has 6 valence electrons (the 2 exponent on the 3s and the 4 exponent on the 3p add up to 6)
The location and energy of all the valence electrons of electrically-neutral sulfur ( S ) is 3s₂3p₄.
What is sulfur ?
Chemical element sulfur has the letter S and atomic number 16. It is multivalent, nonmetallic, and plentiful. Sulfur atoms normally combine to create cyclic octatomic molecules, which have the chemical formula S8. At room temperature, elemental sulfur is a crystalline solid that is brilliant yellow.
In addition to being a fungicide and an ingredient in black gunpowder, sulfur is used to vulcanize black rubber. However, the majority of sulfur is utilized in the creation of sulfuric acid, which is arguably the most significant chemical produced by western civilisations.
Sulfur can be found naturally and in metal sulfide ores. Natively, it may be found close to hot springs and volcanoes.
Thus, option B is correct.
To learn more about sulfur, follow the link;
https://brainly.com/question/16829809
#SPJ5
Which of the following elements would you expect to lose one electron? Select all that apply.
a. sodium
b. chlorine
c. Fluorine
d. Potassium
Answer:
Potassium, sulfur, fluorine, barium
The elements that will lose one electron are:
a. sodium
d. Potassium
What will happen when an element looses one electron?An element in its natural state has an equal number of protons and electrons, giving it a net charge of zero; however, when an element loses an electron as part of a chemical reaction it becomes positively charged, or oxidized.
Out of the given options, sodium and potassium looses one electron and attains a positive charge leading to the formation of cation. While Fluorine and chlorine gains one electron and attains a negative charge leading to the formation of anion.
Thus, correct options are a and d.
Find more information about Cations here:
brainly.com/question/14309645
Assuming that Coca-Cola has the same specific heat as water [4.18 J/(g°C)]. Calculate the amount of heat in kilojoules transferred when one can (about 350 gg) is cooled from 21°C to 8°C.
Answer:
Heat transferred in the process is 19019J
Explanation:
Using the equation:
Q = S×m×ΔT
We can solve the energy transferred in the process, Q, where:
S is specific heat = 4.18J /(g°C)
m is mass = 350g
ΔT is change in temperature (21°C - 8°C = 13°C)
Q = 4.18J/(g°C)×350g×13°C
Q = 19019J
Heat transferred in the process is 19019Jneed help please , thx
Answer:
vxxbvfdb
Explanation:
Answer:
sorry dude
Explanation:
i got no clue
Earth magnetic poles are not in the same place as the geographic poles. True or false
Answer:
TRUE!
Explanation:
2.(04.01 LC)
Fill in the blank with the correct number to balance the equation: KClO3 - 2KCI + 302. (Enter only a whole number.) (3 points)
Answer:
2KClO3 —> 2KCl + 3O2
The coefficients are 2, 2, 3
Explanation:
From the question given above, we obtained the following equation:
KClO3 —> 2KCl + 3O2
The above equation can be balance as follow:
There are 2 atoms of K on the right side and 1 atom on the left side. It can be balance by putting 2 in front of KClO3 as shown below:
2KClO3 —> 2KCl + 3O2
Now, the equation is balanced.
Thus, the coefficients are 2, 2, 3
How does rusting differ from a combustion reaction?
O A. Rusting involves combining with oxygen, and combustion does not.
O B. Although both involve combining with oxygen, combustion is more rapid. O C. Combustion involves combining with oxygen, and rusting does not. O D. Rusting is a redox reaction, and combustion is not.
Answer:
B. Although both involve combining with oxygen, combustion is more rapid.
Explanation:
Both rusting and combustion involves are combination in which a substance reacts with oxygen.
The difference between both processes is that burning is a rapid process. Oxygen combines with a fuel in a very fast rate. Rusting is a slow process and it takes time. Water vapor is often needed for this reaction to take place. The rate at which combustion occurs is more rapid compared to slow, rusting process.Answer:
B. Although both involve combining with oxygen, combustion is more rapid
Explanation:
a p e x