define the word isotope
Answer:
Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.
Answer:
Isotopes are two or more types of atoms with the same atomic number but differing nucleon numbers due to varying numbers of neutrons in their nuclei.
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Which of the following ions will form the weakest bond with Na+?
Br^-
F^-
CI^-
I^-
Answer:
Iodide ion, I- will form the weakest bond with sodium ion, Na+
Explanation:
Electronegativity is the ability with which a neutral atom attracts electrons to itself.
The electronegativity of the halogens decrease on going down the group among the halogens. This is is because on going down the group, the atomic size as well as ionic size of the atoms in the group increases. This increase decreases the effect of the attraction of the positive nucleus on the electrons. Thus, valence electrons can be more readily removed.
The transfer of electrons from metallic sodiummto a halogen results in annionic bond between the two atoms. The strength of the ionic bond decreases on going down the group due to decrease in electronegativity. Thus, iodide ion, I-, which is the least electronegative among the given options will form the weakest bond with Na+.
What are the pros and cons of Traditional Energy?
Answer:
Advantages of Nonrenewable Energy. Less Initial Capital to Install. Consistency. Extraction and Storage. Reliable and Dependable.
Disadvantages of Nonrenewable Energy. Unfriendly to the Environment. Nonrenewable. They Are Unsustainable. Prone to Cause Accidents. The Spread of Weaponizable Materials
hopw this is helpful....
Initially a NaOH solution was standardized by titration with a sample of potassium hydrogen phthalate, KHC8H4O4, a monoprotic acid often used as a primary standard. A sample of pure KHC8H4O4 weighing 1.518 grams was dissolved in water and titrated with the NaOH solution. To reach the equivalence point, 26.90 milliliters of base was required. Calculate the molarity o
Answer:
0.2763M NaOH
Explanation:
Based on the reaction of hydrogen phtalate, KHP, with sodium hydroxide, NaOH:
KHP + NaOH → KNaP + H₂O
1 mole of KHP reacts per mole of NaOH.
In the equivalence point, the moles of NaOH added = Moles of KHP that were dissolved.
Thus, to solve this question, we must find the moles of KHP = Moles NaOH. With the moles and the volume of NaOH required to reach the equivalence point we can find molarity of NaOH solution:
Moles KHP = Moles NaOH (Molar mass KHP = 204.22g/mol):
1.518g * (1mol / 204.22g) = 7.433x10⁻³ moles NaOH
In 26.90mL = 0.0269L:
7.433x10⁻³ moles NaOH / 0.02690L
0.2763M NaOHOnce a product is ready to be sold, engineers must explain their ideas to people who will bring the product to consumers.
Please select the best answer from the choices provided
ОТ
OF
Answer:
ot
Explanation:
there is no choices
Answer:
Advertise
Explanation:
once a product is ready to be sold, engineers explain their ideas to marketing people, who will advertise the product.
Cool air over warm water will:
Increase in temperature
Stay the same in temperature
Decrease in temperature
Answer:
Air and Water Temperature Increases
An increase in the air temperature will cause water temperatures to increase as well. ... Lower levels of dissolved oxygen due to the inverse relationship that exists between dissolved oxygen and temperature. As the temperature of the water increases, dissolved oxygen levels decrease.
Clear selection
3) As the altitude increases within Earth's stratosphere, air temperature generally
A) decreases, only
B) increases, only
C) decreases, then increases
D) increases, then decreases
4) Clouds usually form when
Answer:
B.
Explanation:
because the ozone layer absorbs the greater part of the solar ultraviolet radiation.
you may not want to wear a black shirt in the hot summer because light is
Answer:
The outer layer of fabric does get hotter because the black color absorbs more heat. And that heat doesn't get transmitted to the skin because of the thick fabric. But thin black clothing transmits that heat to the skin, making a person hotter.
Explanation:
how many moles are present in 332g of Ba(NO3)2
Answer:
The SI base unit for amount of substance is the mole. 1 grams Ba(NO3)2 is equal to 0.0038264798528183 mole.
Explanation:
when high pressure is applied to a gas, its
Answer: volume decreases
Identify the decay mode
Please answer asap no explanation needed
(Look at picture)
Answer:
1921 :3 espero y te ayude crack
FREE POINTS
HURRY PLEASE! help me - you do not have to explain your answer If you dont want to, I just want the 2 answers to these two multiple choice problems because I am struggling!
Answer: We must use 5 moles of [tex]Fe_2O_3[/tex]
8.19 moles of oxygen are needed
Explanation:
The balanced chemical reaction is:
[tex]Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(l)+3CO_2(g)[/tex]
As is the limiting reagent as it limits the formation of product and is the excess reagent.
According to stoichiometry :
2 moles of require = 1 mole of
Thus 10 moles of [tex]Fe[/tex] will require=[tex]\frac{1}{2}\times 10=5moles[/tex] of [tex]Fe_2O_3[/tex]
Thus we must use 5 moles of [tex]Fe_2O_3[/tex]
The balanced chemical reaction is:
According to stoichiometry :
2 moles of require = 3 mole of [tex]O_2[/tex]
Thus 5.46 moles of [tex]Fe_2O_3[/tex] will require=[tex]\frac{3}{2}\times 5.46=8.19moles[/tex]
8.19 moles of oxygen are needed
You have an electrolyte that dissociates completely and conducts electricity well. What type of electrolyte would it be classified as?
Answer:
Strong Electrolyte
Explanation:
Electrolytes are classified into strong and weak electrolytes. Strong electrolytes are electrolytes that completely dissociate in an aqueous solution and are as well good conductors of electricity while weak electrolytes are those that are not completely dissociated in an aqueous solution and are not very good conductors of electricity.
Examples of strong electrolytes are strong acid, strong base, and salts. Examples of weak Electrolyte are weak acids and weak bases.
Thus the correct answer is strong electrolytes.
Jimmie places a soccer ball on the ground and kicks it toward the goal. The ball moves along the ground toward the goal. Why does the ball move?
A. The kick decreases the weight of the ball.
B. The kick serves as a contact force on the ball.
C. The kick decreases the force of gravity acting on the ball.
D. The kick removes friction between the ball and the ground.
Answer:
D
Explanation:
Kicking the soccer muscles uses the foot muscle that is applied by mechanical force. The ball moves along the ground as the kick removes the friction.
What is friction?Friction is a resisting force that is encountered by an object or the surface when it moves along another surface. It occurs because the objector the surface slides against each other.
When the kick is applied to a ball lying on the surface then, the frictional force present between the ground and the ball is reduced so that the ball moves along.
Therefore, option D. the kick reduces or removes the frictional force.
Learn more about friction here:
https://brainly.com/question/23095978
Mrs. Hillis runs 5.6 miles every evening. How far does she run in feet? (5,280 ft = 1
mile)
Answer:
29565 feet
Explanation:
multiply 5.6 by 5280
1. A sample of helium gas in a balloon is compressed from 4.0L to 2.5L at a constant temperature. If the pressure
of the gas in the 4.0L volume is 210 kPa, what will be the pressure at 2.5L?
Answer:
A sample of helium gas in a balloon is compressed from 4.0 L to 2.5 L at a constant temperature. If the pressure of the gas in the 4.0-L volume is 210 kPa, what will the pressure be at 2.5 L? P2 = 340 kPa (336 rounded to 2 s.f.)
Explanation:
sana makatulong
The new pressure of the gas whose volume is changed from 4.0L to 2.5L is 336kPa.
BOYLE'S LAW:
The new pressure of a gas with a change in volume can be calculated by using Boyle's law equation as follows:P1V1 = P2V2
Where;
P1 = initial pressure (kPa)P2 = final pressure (kPa)V1 = initial volume (L)V2 = final volume (L)According to this question, a sample of helium gas in a balloon is compressed from 4.0L to 2.5L at a constant temperature. The new pressure can be calculated as follows:210 × 4 = P2 × 2.5840 = 2.5P2P2 = 840 ÷ 2.5P2 = 336kPa. Therefore, the new pressure of the gas whose volume is changed from 4.0L to 2.5L is 336kPa.Learn more at: https://brainly.com/question/1437490?referrer=searchResults
Which of the following statements is true about a balanced chemical equation? A. The number of atoms in the products is greater than the number of atoms in the reactants. B. The number of atoms in the products is less than the number of atoms in the reactants. O C. The number of atoms in the products cannot be determined. O D. The number of atoms in the products is equal to the number of atoms in the reactants.
Answer:
D
Explanation:
the correct answer is D
Sodium
+
Silverchloride —> makes what?
Answer:
The answer is sodium chloride
Explanation:
since Na is more reactive than Ag it displaces the Ag from AgCl
check the reactivity series to prove the point
Answer:
sodium chloride
Explanation:
What are the characteristic property's of metals such as malleability and high conductivity are due to ?
Answer:
Metallic Bonding
Explanation:
Conductivity occurs when electrons or ions are free moving. The conductivity in metals is due to electrons being delocalized in a sea of electrons. Metals contain metallic bonding which allows the electrons to freely move.
Malleability happens when adjacent layers of positive ions move relative to one another while being in contact with the sea of electrons from the metallic bonding.
The OAC simulation showed that warm air over a cold current:
Is not affected by the water
Receives energy from the water
Transfers energy to the water
(the sim isnt needed)
Answer:
Option B
Transfers energy to the water
Explanation:
Warm air transfers energy to the water when it flows over cold currents. This means that the warm air loses heat energy to the cold currents thus, raising its temperature.
Whenever there is a temperature difference between two bodies in contact with each other, the Fouriers law explains that there is always a transfer of heat from the hotter body to the colder body until they become the same temperature.
Thus, following this, heat will flow from the warm air to the cold currents.
What is the molar mass of H2CO3
Answer:
Molar mass of H2CO3 : 62.03 g/mol
Chemistry test!!! no fake answers please and if you can explain then do it because I need all the help I can get!
Answer:
(−ΔH°1)+12(−ΔH°2)+(ΔH°3)+(ΔH°4)
I hope this helps you out!! :)
The Davis Mountains in West Texas were once taller than they are now. Which of the following forces most likely caused the mountains to become shorter over time?
A. Weathering and erosion only
B. Chemical and mechanical weathering only
C. Erosion and deposition only
D. Weathering, erosion, and deposition
*Please don't put unhelpful answers, i have been stuck on this question for the past few days. Thank you!
BRAINLIEST AWARD
If 4.04g of N combines with 11.46g O to produce a compound with a molar mass of 216.0 g/mol, what
is the molecular formula of this compound?
Please explain and show work thank you
We first set about determining the empirical formula of the compound. From the principle of mass conservation, we can assume that the empirical compound contains 4.04 g of N and 11.46 g of O.
We now convert the mass of each element into the number of moles by dividing by the molar mass.
(4.04 g N)/(14.0067 g/mol) = 0.2884 mol N
(11.46 g O)/(15.999 g/mol) = 0.7163 mol O.
To find the empirical formula, we divide each molar quantity by the smaller of the two. That would be the number of moles of nitrogen.
(0.2884)/(0.2884) = 1
(0.7164)/(0.2884) = 2.48 ≈ 2.5.
To make both whole numbers, we multiply each numeral by 2:
(1)(2) = 2
(2.5)(2) = 5.
So, the empirical formula of our compound is N₂O₅.
To find the molecular formula of our compound, we must find the factor by which the molar mass of the actual compound differs from the molar mass of the empirical compound. The molar mass of the empirical compound, N₂O₅, is 108.01 g/mol. We are told that the molar mass of the actual compound is 216.0 g/mol. So, the two differ by a factor of (216.0 g/mol)/(108.01 g/mol) = 1.99 ≈ 2.
The molecular formula of this compound is thus N₂ₓ₂O₅ₓ₂ or N₄O₁₀.
chemistry:
plz help me:D
Answer:
1 atom only with the unit u.
Explanation:
The formula mass of a substance is defined as the sum of the atomic masses of all atoms in a formula unit of the particular substance in question.
Thus the correct answer is option A
How does the strength of a metallic bond compared to other types of bonds?
a. metallic bonds are weaker than ionic bonds or covalent bonds.
b. metallic bonds are equal in strength to ionic and covalent bonds.
c. metallic bonds are weaker than ionic bonds but stronger than covalent bonds.
d. metallic bonds are weaker than covenant bonds but stronger than ionic bonds.
While metallic bonds have the strong electrostatic force of attractions between the cation or atoms and the delocalized electrons in the geometrical arrangement of the two metals. ... Metallic bonds are malleable and ductile, while covalent bonds and ionic bonds non-malleable and non-ductile.
Explain the effect of change in concentration of a system in Equilibrium with at least one example.
Explanation:
If the concentration of a substance is changed, the equilibrium will shift to minimise the effect of that change. If the concentration of a reactant is increased the equilibrium will shift in the direction of the reaction that uses the reactants, so that the reactant concentration decreases. For example, decreased volume and therefore increased concentration of both reactants and products for the following reaction at equilibrium will shift the system toward more products.
What does corona mean?
Answer:
.
Explanation:
10 POINTS
What is used to measure the volume of a solid with an irregular shape? O A. Gas displacement O B. Liquid displacement O C. Plasma displacement O D. Solid displacement
Answer:
Because many objects are not regularly shaped their volume cannot be determined using a volume formula. The volume of these objects can be found by water displacement. A volume of water sufficient to cover the object is placed in a graduated cylinder and the volume read. The object is added to the cylinder and the volume read again. The difference between the two volumes is the volume of the object. This method is demonstrated using the same battery used above.
Explanation:
Help ASAP
3. Components in a heterogeneous mixture are not in the same phase or the composition of the mixture is
a) uniform
b) transparent
c) uneven
Answer:
c
Explanation: