Answer:
7 valence e-, obtain e-, negative
You witnessed a slide breaking while someone is using a microscope.The silde was not dropped.You are tasked with finding out why the slide broke.Explain
Answer:
See the answer below
Explanation:
The slide could have broken due to the ramming of the objective (especially the high power objectives) into the slide on the stage of the microscope while trying to bring the object on the slide into focus.
It is recommended to start with the lowest objective while trying to focus a slide. Thereafter, the next higher objective can be switched to and the image brought into focus once again. This can be repeated until the desired magnification of the image is reached.
However, at higher objective powers, the coarse adjustment knob should be avoided to avoid the objectives touching/breaking the slide. Instead, the fine adjustment knob should be used.
Hence, the breaking of the slide in the illustration could have been due to the use of the coarse adjustment knob at higher objective powers and the ramming of the objective into the slide.
what is normality and molarity of the concentration of solution?
Answer:
Normality is the number of gram equivalents of solute divided by the volume in liters.
The molarity is the amount of moles in solute divided by the volume in liters.
Moles are the molar mass times grams if you're curious
I hope this helps and good luck!
Answer:
Molarity and normality describe the numbers (moles) of reactants or products dissolved in one liter of solution. Molarity: M = moles of solute contained in one liter of solution. ... Normality is always a multiple of molarity. It describes the “equivalent” moles of reactants involved in chemical reactions.
Explanation:
Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Gram equivalent weight is the measure of the reactive capacity of a molecule. The solute's role in the reaction determines the solution's normality. Normality is also known as the equivalent concentration of a solution.
Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
Formula for Molar: M = [tex]\frac{n}{v}[/tex]
how do computers use input and output to get and give the imformation that tney need to solve problem
Answer:
Question of the Day: How do computers use input and output to get and give the information that they need to solve problems? Typing on a Keyboard (Input) Makes Letters Appear on a Screen (Output) Moving a Mouse or Touch Screen (Input) Changes What Appears on the Screen (Output)
which element forms the skeleton of this polymer?
a.carbon
b.copper
c.hydrogen
d.oxygen
Answer: A - Carbon
Explanation: Hope this helps!
1.
10
2.
3.
4.
60
Which polygons are similar?
110
60
10
01
02
03
04
Answer:
The answer is "1 and 4 polygons were similar".
Explanation:
In the given question, in both figures 1 and 4, it's measure angle were 10, 60, 110. In figure number 4, its angle is 10, 60, and on the third side, its value is equal to 110, which is (180 - 70).
calculate the number of atom of K element in 122.5g of KClO3
Answer:
6.022×10²³ atoms of K
Explanation:
Given data:
Mass of KClO₃ = 122.5 g
Number of atoms of K = ?
Solution:
First of all we will calculate the number of moles of KClO₃ .
Number of moles = mass/molar mass
Number of moles = 122.5 g/ 122.5 g/mol
Number of moles = 1 mol
One mole of KClO₃ have 1 mole of K atoms.
Number of atoms of K:
1 mole = 6.022×10²³ atoms of K
Thus in 122.5 g of KClO₃ 6.022×10²³ atoms of K are present.
A major contributor to the “hole” in the ozone layer:
A. carbon
B. nitrogen
C. fluorine
D. the polar vortex
E. the tilt of the Earth
Answer:
I think it's D, the Polar Vortex.
Answer:
A
Explanation:
Chlorofluorocarbons (from aerosols, and a type of carbon!) are super damaging to the ozone layer and actually breaks down the ozone particles!
Sorry! Reposting bc my answer got deleted, I'm assuming it's because I had a link to my source!
Q2 A solution has a (OH-) = 4.0x10^-5 M. What are the [H30+) and the pH of the
solution?
Answer:
[H₃O⁺] = 2.5 × 10⁻¹⁰ M
pH = 9.6
Explanation:
Step 1: Given data
Concentration of OH⁻ in the solution ([OH⁻]): 4.0 × 10⁻⁵ M
Step 2: Calculate the concentration of H₃O⁺ in the solution
Let's consider the self-ionization of water.
2 H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq)
The ion-product of water (Kw) is:
Kw = 1.0 × 10⁻¹⁴ = [H₃O⁺] × [OH⁻]
[H₃O⁺] = 1.0 × 10⁻¹⁴/[OH⁻]
[H₃O⁺] = 1.0 × 10⁻¹⁴/4.0 × 10⁻⁵
[H₃O⁺] = 2.5 × 10⁻¹⁰ M
Step 3: Calculate the pH of the solution
We will use the following expression.
pH = -log [H₃O⁺]
pH = -log 2.5 × 10⁻¹⁰
pH = 9.6
Taking into account the definition of pH and pOH, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.
First of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
The following relationship can be established between pH and pOH:
pH + pOH= 14
In this case, you know that [OH⁻]= 4×10⁻⁵ M. For this concentration, the pOH is calculated as:
pOH= - log (4×10⁻⁵ M)
pOH= 4.398
Then, pH can be calculated as:
pH + 4.398= 14
pH= 14 - 4.398
pH= 9.602
So, the [H₃O⁺] is calculated as:
9.602= - log [H₃O⁺]
[H₃O⁺]= 10⁻⁹ ⁶⁰²
[H₃O⁺]= 2.5×10⁻¹⁰ M
Finally, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.
Learn more:
brainly.com/question/13557815?referrer=searchResultsQuestion 11. Identify the reducing agent
Sn+2 + AG 0 —> Sn0 + Ag+
Answer:
Ag 0 is the reducing agent.
Explanation:
Reducing -> gaining electrons
Oxidizing -> losing electrons
Ag lost electrons (became more positive) since it went from a 0 charge to a +1 charge. Therefore it was oxidized. Ag+ is the oxidized product. Reactants that create an oxidized product are called reducing agents. This would make Ag 0 the reducing agent in this reaction.
1.562 g sample of the alcohol CH3CHOHCH2CH3 is burned in an excess of oxygen. What masses of H2O and CO2 should be obtained
Answer:
[tex]m_{CO_2}=3.709gCO_2 \\\\m_{H_2O}=1.898gH_2O[/tex]
Explanation:
Hello.
In this case, since the molecular formula of the given alcohol is C₄H₁₀O (molar mass = 74.14 g/mol), we can write its combustion reaction as shown below:
[tex]C_4H_1_0O+6O_2\rightarrow 4CO_2+5H_2O[/tex]
Thus, since there is a 1:4 mole ratio with carbon dioxide (molar mass = 44..01 g/mol) and a 1:5 mole ratio with water (molar mass = 18.02 g/mol), we can compute the obtained masses as shown below:
[tex]m_{CO_2}=1.562gC_4H_1_0O*\frac{1mol}{74.14gC_4H_1_0O} *\frac{4molCO_2}{1molC_4H_1_0O} *\frac{44.01gCO_2}{1molCO_2}=3.709gCO_2 \\\\m_{H_2O}=1.562gC_4H_1_0O*\frac{1mol}{74.14gC_4H_1_0O} *\frac{5molH_2O}{1molC_4H_1_0O} *\frac{18.02gH_2O}{1molH_2O}=1.898gH_2O[/tex]
Best regards!
Which element is the most similar to calcium ca
Answer:
strontium
Explanation:
Answer:
Strontium
Explanation:
This is a earth metal, calcium is a reactive metal that forms a dark oxide nitride layer when exposed to air.
Is this an example of decomposition
2CH4 + 402 → 2C02 + 4H2O
Answer:
Identify each equation as a composition reaction, a decomposition reaction, or neither.
Fe2O3 + 3 SO3 → Fe2(SO4)3
NaCl + AgNO3 → AgCl + NaNO3
(NH4)2Cr2O7 → Cr2O3 + 4 H2O + N2
Solution
In this equation, two substances combine to make a single substance. This is a composition reaction.
Two different substances react to make two new substances. This does not fit the definition of either a composition reaction or a decomposition reaction, so it is neither. In fact, you may recognize this as a double-replacement reaction.
A single substance reacts to make multiple substances. This is a decomposition reaction.
Test Yourself
Identify the equation as a composition reaction, a decomposition reaction, or neither.
C3H8 → C3H4 + 2 H2
Explanation:
I hope I help :)))
The fact that atoms and molecules are always in motion helps scientists explain how solids turn into liquids. What is this explanation an example of? A.
a hypothesis
B.
an observation
C.
a scientific law
D.
a scientific theory
The internal energy of reaction is -855.1). The reaction has a change of
temperature of 63.20°C that consist of 8.85g of material. Assume the
heat capacity of 2.650J/g °C. What is the work energy of this process..
The work energy of this process : 2337.298 J
Further explanationThe laws of thermodynamics 1 state that: energy can be changed but cannot be destroyed or created
ΔU=Q-W
Q=m.c.Δt
[tex]\tt Q=8.85\times 2.650\times 63.2=1482.198~J[/tex]
the work (W) :
[tex]\tt W=Q-\Delta U\\\\W=1482.198-(-855.1)=2337.298~J[/tex]
Which of the following is a renewable source of energy?
Answer: D
Explanation:
Hydropower
11
SKILL LEVEL
Proficient
Which substance conducts electricity in the liquid state but is a
poor conductor in the solid state?
a: Li₂O
b: SeCl2
C: P205
d: Hg
Answer:
a: Li₂O
Explanation:
Ionic compounds are good conductors only in liquid state. They do not conduct electricity in their solid state.
The only ionic compound from the given choices is Li₂O.
Ionic compound do not conduct electricity in their solid state because their ions are locked and are not free to move about their fixed lattice. In liquid states, they go into solution and they are free to move thereby acting as a good conductor.
Bromine gas in a container is heated over a flame. What happens to the average kinetic energy of the bromine particles? It decreases rapidly. It increases quickly. It remains the same. It decreases slowly.
Answer: B. It increases quickly
Explanation:
As the bromine gas in a container is heated over a flame, the average kinetic energy increases quickly.
Kinetic energy of gas moleculeThe temperature of gas molecules is the measure of average kinetic energy of the gas molecules.
The increase in temperature increases the heat gained by the gas molecules which in turn increases the average kinetic energy of the individual gas molecules.
Thus, as the bromine gas in a container is heated over a flame, the average kinetic energy increases quickly.
Learn more about average kinetic energy of gases here: https://brainly.com/question/952575
How many atm is 25.0 psi?
Answer:
1.70115 or 1.70 atm
Explanation:
1 psi is equal to 0.068046 atm.
Sulfur has an electronegativity of 2.58, while Cesium has a value of 0.79. Based on this information, they would have what kind of chemical bond?
Answer:
Ionic
Explanation:
Because sulphur is a non-metal and cesium is part of the group 1 Alkali Metals, this creates an ionic bond
Ionic bonds are created from one metal and one non-metal element.
This still is declared as Ionic despite the balance of this is Cs2S
At 298 K and 1 atm which noble gas has the lowest density? Why?
1) Ne
2) Kr
3) Xe
4) Rn
Answer:
Ne
Explanation:
It has the lowest density.
Neon has the lowest density since it has the smallest atomic size and the lowest atomic number.
At a standard temperature of 298K and a pressure of 1 atm;The atomic density of an element refers to the number of atoms contained in an element per unit volume.
The size of an atom has an effect on atomic density. The size of an atom increases from left to right across the period and top to bottom down the group.
As such, on the periodic table, as we move from top to bottom down the group, the density of an atom increases.
The atomic element of the given elements are:
Neon (Ne) = 10Krypton (Kr) = 36Xenon (Xe) = 54Radon (Rn) = 36Therefore, we can conclude that Neon (Ne) will have the lowest density since it has the smallest atomic size and the lowest atomic number.
Learn more about the Periodic table here:
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What is the zonecreated if force of separation occurs?
What does RAP mean (this for science this is counting atoms btw help if you can)
Answer:
rapid assessment procedure
Abbreviation for: rapid assessment procedure. Rapid Assessment Process. rapid atrial pacing. referrals, assessments and packages of care.
Explanation:
Hope this helps you
16.
One way stars are different from moons is stars
A.
move around planets, and moons do not
B.
are colder than moons.
C.
are rounder than moons.
D.
produce heat and light, and moons do not.
PLEASSE ANSWER ASAP
How did the instrument in the picture help to disprove part of Dalton's atomic model?
A)
It showed all matter is made of atoms and that atoms are indivisible and
indestructible.
B)
It showed that all atoms of a particular element are not identical.
C)
It showed that compounds are formed by a combination of two or more
different kinds of atoms.
D)
It showed that a chemical reaction is a rearrangement of atoms.
No
Answer:
It’s b;)
Explanation:
Answer:
B is correct
Explanation:
Considering the patterns you have noticed in this activity, which statement best explains why a compound with the molecular formula CH3 doesn't exist in nature?
A. Hydrogen typically needs four bonds to reach a noble gas configuration.
B. Carbon needs more than just three bonds to reach a noble gas configuration. C. The chemical CH3 does not react with other substances because of its high stability.
D. CH3 has three double bonds, which fails to give it a noble gas configuration
Answer:
The answer is B
Explanation:
I had the same question and I chose B and it was correct.
Answer:
B. Carbon needs more than just three bonds to reach a noble gas
Explanation:
PLATO ANSWER
PLATO EXPLANATION-
Each hydrogen atom can make only one bond, but a carbon atom needs four bonds to be stable. Therefore, three hydrogen atoms are not enough for the carbon atom to make four bonds.
The compound potassium carbonate is a strong electrolyte. Write the reaction when solid potassium carbonate is put into water
Answer:
K2CO3 (aq) ---> 2K+ (aq) + CO32- (aq)
Explanation:
Dissociation refers to the ability of an ionic compound to breakdown into its respective ions. An ionic compound is formed by the combination of a positive ion (cation) and a negative ion (anion). When these ionic compound dissolves in water, it dissociates i.e. separates into its constituent ions.
In this question involving potassium carbonate being described as a strong electrolyte, which means that it dissociates completely in water as follows:
K2CO3 (aq) ---> 2K+ (aq) + CO32- (aq)
How many molecules are there in .0023kg of NH4SO2?
Answer:
Molar mass of NH4SO2=104gmol`
No of moles of NH4SO2=2.3g/104gmol`=0.022×(avagadro's constant)
chemical formular of ammonium tetraoxosulphate 4
♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️
(NH4)2 SO4
♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️
Which of the following elements can only form single covalent bonds when forming molecular compounds?
a) Nitrogen
b) Hydrogen
c) Carbon
d) Oxygen
Hydrogen can only form single covalent bonds when forming molecular compounds. Therefore, option B is correct.
What is covalent bond?A covalent bond is a type of chemical bond formed between two or more atoms in which electrons are shared between them. Covalent bonds usually occur between nonmetal atoms and are formed by the sharing of valence electrons.
Hydrogen can only form a single covalent bond because it has only one valence electron and needs one more electron to complete its valence shell, making it stable.
Nitrogen can form triple covalent bonds, carbon can form multiple covalent bonds, and oxygen can form double covalent bonds in molecular compounds.
Thus, option B is correct.
To learn more about the covalent bond, follow the link:
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Why is Mg++ smaller than Mg atom?
Answer:
The magnesium ion is much smaller than the magnesium atom because magnesium atom contains more electrons as compared to magnesium ion. Explanation: ... Whereas when an atom tends to lose an electron then it acquires a positive charge and size of the atom tends to increase.
Answer:
Because it looses it two electrons to form a stable octet Ionic form..........
