Answer: Three groups bound to it with no lone pairs
i think...
9. Let's say, you need to make 2.00 L of 0.05 M copper (II) nitrate solution. How many grams of
copper (II) nitrate will you require?
Answer:
18.76 g of copper II nitrate
Explanation:
Now recall that we must use the formula;
n= CV
Where;
n= number of moles of copper II nitrate solid
C= concentration of copper II nitrate solution
V= volume of copper II nitrate solution
Note that;
n= m/M
Where;
m= mass of solid copper II nitrate
M= molar mass of copper II nitrate
Thus;
m/M= CV
C= 0.05 M
V= 2.00 L
M= 187.56 g/mol
m= the unknown
Substituting values;
m/ 187.56 g/mol = 0.05 M × 2.00 L
m= 0.05 M × 2.00 L × 187.56 g/mol
m= 18.76 g of copper II nitrate
Therefore, 18.76 g of copper II nitrate is required to make 0.05 M solution of copper II nitrate in 2.00 L volume.
What is an endothermic reaction?
O A. A reaction that produces heat
O B. A reaction that uses radiation waves
C. A reaction that absorbs heat
O D. A reaction that contains enthalpy
Answer:
C. A reaction that absorbs heat
Explanation:
I do not know Latin, but roughly speaking 'Endo' means inside, and 'thermic' means heat.
There are several types of chemical reactions, two of the important reactions are endothermic and exothermic. An endothermic reaction absorbs heat. The correct option is C.
What is endothermic reaction?The chemical reaction which proceed with the absorption of heat energy is defined as the endothermic reaction. In an endothermic reaction, the system gains heat and hence the enthalpy change ΔH will be positive.
In endothermic reaction, because of the absorption of heat, the enthalpy of the products will be more than that of the reactants. An example of endothermic reaction is shown as:
N₂ (g) + O₂ (g) → 2NO (g) ΔH = 180.5 kJ
So in endothermic reactions, the reactants absorb heat energy from the surroundings to produce the products. These reactions reduce the temperature of the surrounding area and thereby creates a cooling effect.
Thus the correct option is C.
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what causes the difference genetically identical organisms
Answer:
the epigenetic perspective. ... Such variation among organisms with virtually identical chromosomal DNA sequences has largely been attributed to the effects of environment.Explanation:
Which of the following is a combustion reaction?
O A. CO2 + H2O + H2CO3
O B. CzHg + 502 → 3002 + 4H20
O C. MgSO4 + Ba → BaSO4 + Mg
D. NaOH + HCl → NaCl + H2O
Consider the following reversible reaction.
Answer:
B is the correct option
Explanation:
K= the ratio of product of concentration of products to the product of concentration of reactants raised to power equal to their cofficients.
Answer:
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Explanation:aaaaaaa
Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
0.00325136 - 1.76527 =
Answer:
-1.76201864
Explanation:
0.00325136 - 1.76527 = 1.76201864
The concept of significant figures are mainly used by scientist and engineer to know the significance of digits in a measurement. Therefore, -1.76201 is the value on applying mathematical operation.
What is significant figures?Significant figures are the figures that indicate the degree of accuracy of a value. It tells about the precision of a value. It gives an idea about the digits that are necessary to indicate the experimental value.
Rules for counting significant figures are:
Number between 1 to 9 is always significant
Zeroes after a number has got no significance
Zeroes before a number has got no significance
Zeroes between number has got significance
0.00325136 - 1.76527
= -1.76201
Therefore, -1.76201 is the value on applying mathematical operation.
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If you want to lift a 30-kg box to a height of 1 m, how much work will it take?
A. 300 J
B. 147 J
C. 294 J
D. 30 J
If we want to lift a 30 kg box to a height of 1 m Ans is 294 J
Explanation:
Ans is 249 J
Calculate the molar mass of carbon tetrafluoride (CF4) in grams per mole, rounding to proper significant figures, if mc= 12.01 u and mF = 19.00 u.
Answer:
molar mass of carbon tetrafluoride (CF4) is
(12.01 × 1 ) + ( 4 × 19.00)
= 12.01 + 76
= 88.01u
= 88u
Hope this helps
The diagram below shows the different phase transitions that occur in matter. Three bars are shown labeled Solid, Liquid, and Gas. They are connected by arrows labeled 1 to 6. Arrow 1 points from liquid to gas; arrow 2 from solid to liquid, arrow 3 from solid to gas, arrow 4 from gas to liquid, arrow 5 from liquid to solid, and arrow 6 from gas to solid. Which statement best describes the process that arrow 1 represents? Molecules are speeding up as boiling occurs. Molecules are slowing to a stop while freezing. Molecules are slowing down during condensation. Molecules are vibrating in stationary positions.
Answer:
Molecules are speeding up as boiling occurs.
Explanation:
We have three states of matter;solid liquid and gas. Substances are found in these different states of matter according to the degree of energy and velocity of its particles. Highly energetic particles moving at high velocities are found in the gaseous state. Less energetic particles moving at lesser velocities due to intermolecular forces are found in the liquid state while particles with the least degree of freedom are found in the solid state. Solid particles do not translate but can vibrate or rotate about a fixed position.
When a liquid boils, particles at the surface of the liquid acquire sufficient energy and escape the surface of the liquid. This is because, as energy is supplied in the form of heat during boiling, molecules acquire sufficient energy to speed up their molecular motion and escape the liquid surface as vapour.
Molecules are speeding up as boiling occurs is the statement that best describes the process of arrow 1.
Evaporation is a physical process in which matter transforms from a liquid state to a gaseous state. Generally this process occurs when matter is exposed to high amounts of energy.
When a material is exposed to energy, its particles begin to move and speed up until they break their bonds and are released in the form of gas.
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What volume of air at 25°C and 1.00 atm can he stored in a 10.0 L high-pressure air tank if compressed to 25°C and 175 atm? please show your work!
Answer:
0.057 L
Explanation:
Data obtained from the question include:
Initial temperature (T1) = 25°C
Initial pressure (P1) = 1 atm
Initial volume (V1) = 10 L
Final temperature (T2) = 25°C
Final pressure = 175 atm
Final volume =.?
From the data obtained from the question, we can see that the temperature is constant. Therefore, we shall apply the Boyle's law equation to determine the new volume of air. This is illustrated below:
P1V1 = P2V2
1 x 10 = 175 x V2
Divide both side by 175
V2 = 10/175
V2 = 0.057 L
Therefore, the volume of air which can be stored when the tank is compressed is 0.057 L
1. Convert 0.00006125 to scientific notation
Answer:
6.125 × 10^-5
Explanation:
You have to move the decimal place 5 times to the right. Remember in scientific notation the first number, (the number that comes before the 10) has to be between 1.0 and 9.99...
What determines an element's emission spectrum?
O A. The size of the sample
O B. The mass of the nucleus
O C. The electron energy levels
O D. The number of protons
An elements's emission spectrum determines the electron energy levels and the correct option is option C.
An element's emission spectrum is determined by the specific energy levels of its electrons. When an electron in an atom transitions from a higher energy level to a lower energy level, it releases energy in the form of electromagnetic radiation.
The wavelength and frequency of this emitted light correspond to specific energy differences between the electron energy levels. Each element has a unique arrangement of electron energy levels, leading to a distinct emission spectrum.
By analyzing the emitted light, scientists can identify the element and gain insights into its atomic structure. The size of the sample, mass of the nucleus, and number of protons do not directly determine an element's emission spectrum.
Thus, the ideal selection is option C.
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What are the units of molality? A. mol/kg B. g/mol C. mol/L D. kg/mol
Answer:
A. mol/kg
Explanation:
hope it helps .
Use the chemical equation to find the answers. BaSO4 + H2SO4 → Ba(HSO4)2 Identify how many oxygen atoms are in the product. Identify how many oxygen atoms are in the reactant.
Answer:
Since the equation is balanced, So it have same number of oxygen in the reactants and well as product.
Oxygen in product = 8
Oxygen in reactant = 8
Answer:
Explanation:
i got prove thoooooo
Which of the following inter-particle forces has the lowest potential energy?
A. ion-ion interaction
b. hydrogen bonding
c. dipole-dipole interaction
d. ion-dipole moment
Answer:
b. hydrogen bonding.
Explanation:
Hope it helps.
An element is:
A. A compound formed when different atoms react and form bonds with each other.
B. A pure chemical compound consisting of multiple atomic numbers.
C. A pure chemical substance consisting of one type of atom.
D. Two or more compounds that are mixed together but not chemically bonded.
Reset Selection
The world's record for the largest cup of coffee was broken on October 15, 2010 with a 2010 gallon cup of coffee in Las Vegas, Nevada. If a cup of coffee contains 318 mL of coffee, how many cups of coffee would be required to fill the world record coffee cup?
Answer: 23927 cups of coffee would be required to fill the world record coffee cup.
Explanation:
Volume of cup of coffee = 318 ml
Volume of largest cup (world record coffee cup) of coffee = 2010 gallon
Volume of largest cup of coffee in ml = [tex]2010\times 3785.41=7608678ml[/tex] ( 1 gallon = 3785.41 ml)
To find : Number of cups of coffee to fill world record coffee cup = x
Thus as we know :
[tex]{\text {Number of cups of coffee to fill world record coffee cup}}\times {\text {Volume of cup of coffee}}={\text {Volume of largest cup (world record coffee cup) of coffee}}[/tex]
Putting in the values we get:
[tex]x\times 318ml=7608678ml[/tex]
[tex]x=23927[/tex]
Thus 23927 cups of coffee would be required to fill the world record coffee cup.
Which of the following sources is considered to be most reliable for scientific
information?
A. Legislation regarding environmental issues
B. Article in an academic journal
C. Interpretation of a journal article
D. Political commentary on research
Answer:
The answer is D
Explanation:
Pls mark as brainliest
What is a base?
A. A substance that contributes chloride ions to the solution
B. A substance that increases the concentration of oxygen in
solution
C. A substance that increases the concentration of OH ions in
solution
D
O D. A substance that increases the concentration of H+ ions when
dissolved
de semana
Answer:
The subsrance that increases OH ion concentration.
Explanation:
5. Which type of substances do you separate into lons when writing the complete lonic equation?
Answer:
As a general rule, soluble ionic compounds, strong acids, and strong bases should be written as dissociated ions in the complete ionic equation. Insoluble salts and weak acids are written using the neutral molecular formula since they only dissociate to a very small extent in water.
Explanation:
What is the change in enthalpy of the first reaction below, given the enthalpies
of the other two reactions?
2NO(g) + O2(g) + 2NO2(g)
N,(8)+ O2(g) → NO(g)
N,(8)+O2(g) + NO2(g)
AH = 90 kJ/mol
AH° = 34 kJ/mol
A. 56 kJ
B. -112 kJ
C. 124 kJ
D. -248 kJ
Answer:
The correct option is;
B. -112 kJ
Explanation:
The parameters given are;
N (g) + O₂ (g) → NO (g) ΔH = 90 kJ/mol
N (g) + O₂ (g) → NO₂ (g) ΔH = 34 kJ/mol
The required chemical reaction is given as follows;
2NO (g) + O₂ (g) → 2NO₂ (g)
Therefore, the heat of formation of 2 moles of NO = 2 × 90 = 180 kJ
The heat of formation of 2 moles of NO₂ = 2 × 34 = 68 kJ
Hence, given that the heat of formation of O₂ at room temperature = 0 kJ/mol, we have;
Change in enthalpy of the chemical reaction = Heat of formation of the products - Heat of formation of the reactants
Change in enthalpy of the chemical reaction = 68 kJ - 180 kJ = -112 kJ
Change in enthalpy of the chemical reaction = -112 kJ.
Answer:
-112
Explanation:
got it right on test
Who is correct? Reggie, because baking and melting cause bonds to be broken, leading to a chemical change. Reggie, because objects that are heated always undergo chemical changes. Charlotte, because melting objects only sometimes cause a chemical change. Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.
Answer: Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.
Explanation: Baking is a chemical change you cant turn it back to what it was before. Its chemical properties have changed. Melting is a physical change. Its chemical properties are still the same it has not changed. It just changed it's physical form but the object is still the object.
Answer:
Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.
Explanation:
took the quiz on edge
Phosphorus has three electrons in its 3p sublevel and sulfur has four.
Phosphorus should have the lower ionization energy but it does not,
sulfur does. What does this provide evidence for?
A. Aufbau's principle
B. Conservation of energy
C. Hund' rule
D. None of these
Reset Selection
Answer:
The correct answer is C. Hund's rule.
Hund's rule states that for atoms in their ground state, electrons will occupy orbitals of the same energy level one by one before pairing up. This means that when filling the 3p sublevel, phosphorus should have one electron in each of the three 3p orbitals before any of them start pairing up.
However, in reality, sulfur has a lower ionization energy than phosphorus. This means that it is easier to remove an electron from sulfur than from phosphorus. This contradicts the expectation based on Hund's rule.
Therefore, the fact that sulfur has a lower ionization energy than phosphorus provides evidence that Hund's rule is not the only factor governing the electron configuration and ionization energies of elements. Other factors, such as electron-electron repulsion and the stability of half-filled or filled subshells, also play a role.
Once an action plan is in place, it should not be changed.
Please select the best answer from the choices provided.
ОТ
OF
Answer:
F = False
Explanation:
An action plan is a plan that an individual or a firm creates, that contains their objectives, aims, strategies , which they require to achieve their specific goals.
An action plan is very detailed, streamlined and straight to the point. It contains a series or a number of steps or tasks that an individual must embark on in other to achieve their end goal.
WHEN AN ACTION PLAN AS BEEN PUT IN PLACE OR SET IN MOTION, IT CAN BE CHANGED OR ALTERED. This is because the aim of a action plan is to achieve the end goal of an individual or a firm. As long as the changes made in the action plan does not hinder the achievement of those goals then the action plan can be changed.
Some of the very common reasons why action plans are changed or modified includes:
a) To make the action plan more flexible.
b) To track and monitor your progress in achieving your end goal. If there is a delay, you can easily track it out on your action plan and modify it.
In other to create an action plan, it is very important that the goals of such that individual or firm is very well defined and clear from the beginning. Action plans must always be monitored, and updated regularly.
Answer:
F, false
Explanation:
i took the quiz on edge
39. Which of the following substances are insoluble in water? Select all that apply.
A)Li2CO3
B)BaSO4
C)Mg3(PO4)2
D)КОН
Answer:
B) BaSO₄ and C) Mg₃(PO₄)₂
Explanation:
We can use the solubility rules to decide which substances are insoluble.
You have probably learned NAG SAG and "Cats Cradle Old People," Sally Said.
I've listed them below.
[tex]\begin{array}{lll}\textbf{Soluble} & \textbf{Insoluble}\\\textbf{N}\text{itrates} &\textbf{C} \text{arbonates }\\ \textbf{A}\text{cetates} & \textbf{C}\text{hromates}\\ \textbf{G}\text{roup 1} & \textbf{O}\text{ hydrOxides}\\ & \textbf{P} \text{hosphates}\\\textbf{S}\text{ulfates} &\textbf{S} \text{ulfites}\\ \textbf{A}\text{mmonium}& \textbf{S}\text{ulfides}\\\textbf{G}\text{roup 17} & \\\end{array}[/tex]
These aids help you remember that:
The salts of Group 1 metals are soluble (Li₂CO₃ and KOH).
Sulfates are usually soluble, except for BaSO₄. Thus, BaSO₄ is insoluble.
Phosphates are insoluble — Mg₃(PO₄)₂
The two insoluble compounds are BaSO₄ and Mg₃(PO₄)₂.
How many grams of KCl will dissolve in 100g H2O at 40°C?
Answer:
5 grams
Explanation:
The empirical formula is:
A. the actual number of atoms of each element in a molecule.
B. representation of a compound that shows how its atoms are arranged.
C. All of these
D. the relative number of atoms of each element, using the lowest whole ratio.
Reset Selection
Answer:
option c the relative number of atoms of each element using the lowest ratio because empirical formula gives the simplest-whole number ration of each element
e.g. the empirical formula of benzeneC6H6 in CH
Explanation:
I HOPE IT WILL HELP YOU
What is the result of increasing the temperature of a gas? A. The number of molecules will increase. B. The molecules will slow down. C. The volume of the gas will decrease. D. The kinetic energy will increase
Answer:
D. The kinetic energy will increase
Explanation:
Answer:
Hello
I think the third one is correct.
Explanation:
Because when we increase the temperature of a gas the increasing give energy to gas molecules.
Good luck.
41. Which pair of compounds could combine to produce an ester?
I. CH3- CH2 - CH2 - CH3
II. CH3- CH2 - CH2-CH2-OH
III. CH3- CH2 - CH2-COOH
IV. CH3- CH2- CH2- COH
a. I and II
b. II and III
c. II and IV
d. III and IV
Answer: b. ii and iii
Explanation:
The ester, Butyl Butanoate is formed when Butanol reacts with Butanoic acid
as seen below;
CH3-CH2-CH2-CH2-OH + CH3-CH2-CH2-COOH ---->
Butanol Butanoic acid
CH3-CH2-CH2-COOCH2-CH2-CH2-CH3 + H2O
Butyl Butanoate Water
What kind of solution would have a Ky value that is much less than 12
A. A strongly basic solution
B. A weakly acidic solution
C. A strongly acidic solution
D. A weakly basic solution
Answer:
The answer is option D.
A weakly basic solution
Hope this helps.
Answer:
Explanation: Apex a weakly acidic solution