Answer:
Yes, they are useful.
Explanation:
They allow us to make use of strengths and benefits of a particular element while not being hampered by it's faults.
PLEASE HURRY !!
Which of these is the best conductor of electricity?
distilled water
salt water
carbonated water
sugar water
Answer:
Pretty sure its salt water, my apologies if its wrong
Explanation:
Answer:
Sugar water :) took the test lol
Explanation:
What factors influence the dissolving process for any salt
Answer:
factors affecting solubility
Temperature. Basically, solubility increases with temperature. ...
Polarity. In most cases solutes dissolve in solvents that have a similar polarity. ...
Pressure. Solid and liquid solutes. ...
Molecular size. ...
Stirring increases the speed of dissolving.
Explanation:
google hope this helps you thank you for helping me
Answer:
Temperature. Basically, solubility increases with temperature. Polarity: In most cases solutes dissolve in solvents that have a similar polarity.Pressure. Solid and liquid solutes. Molecular size. Stirring increases the speed of dissolving.
AgCl (silver chloride)
a. List the elements by name.
b. How many atoms of each element?
C. How many total atoms in the formula?
Answer:
a. Silver; chlorine
b. One atom of Ag; one atom of Cl
c. Two atoms total
Explanation:
The concentration of a reactant is doubled
Answer:
Explanation: If the rate doubles when the concentration of reactant is doubled, the reaction is the first-order. If the rate becomes 4-fold times (quadruples) when the concentration of the reactant is doubled, the reaction is the second-order and similarly, the third, the fourth, and the higher orders.
Se sabe que 10 g de calcio reaccionan con 4 g de oxígeno para obtener 14 g de óxido de calcio. Indica la cantidad de óxido de calcio que se obtiene al hacer reaccionar cantidades iguales de calcio y oxígeno (por ejemplo, 50 g de cada uno)
Answer:
Si se usan 50 gramos de calcio y óxigeno, se obtienen 70 gramos de óxido de calcio.
Explanation:
Hola,
En este caso, la reacción llevada a cabo es:
[tex]2Ca+O_2\rightarrow 2CaO[/tex]
De este modo si asumimos el ejemplo dado, 50 gramos de calcio, cuya masa atómica es 40 g/mol y 50 g de oxígeno, cuya masa atómica como gas diatómico es 32 g/mol, antes de calcular los gramos de óxido de calcio producidos, debemos identificar el reactivo límite. Así, calculamos las moles de calcio disponibles en 50 g:
[tex]mol_{Ca}^{disponible}=50gCa*\frac{1molCa}{40gCa} =1.25molCa[/tex]
Y también las moles de calcio consumidas por los 50 g de oxígeno, utilizando su relación molar 2:1:
[tex]mol_{Ca}^{consumidas\ por\ O_2}=50gO_2*\frac{1molO_2}{32gO_2} *\frac{2molCa}{1molO_2} =3.125molCa[/tex]
Por lo tanto, hay menos calcio disponible que el que consume el oxígeno, por lo que el calcio esel reactivo límite. Ahora, con este, calculamos los gramos de óxido de calcio, cuya masa molar es 56 g/mol, que se producen:
[tex]m_{CaO}=1.25molCa*\frac{2molCaO}{2molCa}* \frac{56gCaO}{1molCaO}\\ \\m_{CaO}=70gCaO[/tex]
Esto quiere decir que de 50 gramos de oxígeno, solo 20 gramos reaccionan para formar 70 gramos de óxido de calcio.
Saludos!
Answer:
69.9 g of CaO will be produced. ≅ 70 g
Explanation:
First of all you need to make the reaction:
2Ca + O₂ → 2 CaO
Determine the moles of each reactant:
10 g Ca / 40.08 g/mol = 0.25 moles
4 g O₂ / 32 g/mol = 0.125 moles
There is no limiting reagent in this reaction, we can use both elements.
Ratio between Ca and CaO, is 2:2. For 0.25 moles of Ca I would make 0.25 moles of CaO. We convert the moles to mass:
0.25 mol . 56.08 g / 1mol = 14 g
Let's think when you have the same mass of reactant:
50 g Ca/ 40.08 g/mol = 1.24 moles
50 g O₂ / 32 g/mol = 1.56 moles
For 1 mol of oxygen I need 2 moles of calcium, so If I have 1.56 moles, I would need the double, 3.12. Notice that Ca is the limiting reagent (we need 3.12 moles of reactant, but we only have 1.24). Now we need to work with it. If 2 moles of Ca, makes 2 moles of CaO, then 1.24 moles, will produce the same amount of oxide. We finally convert the moles to mass: 1.24 mol . 56.08 g/mol = 69.9 g
Based on their number of valence electrons, which group of elements will gain two electrons by bonding with other atoms?
Question 1 options:
Be, Mg, Ca, Sr, Ba
F, Cl, Br, I, At
O, S, Se, Te, Po
N, P, As, Sb, Bi
Answer:
O, S, Se, Te, Po
Explanation:
Oxygen, sulphur, selenium, tellurium and polonium are all members of group sixteen. The elements in group sixteen all possess six electrons in their outermost shell. Recall that an atom is said to stable if it contains eight electrons in its outermost shell. This is also referred to as the octet rule. Hence atoms of elements obey the octet rule when they combine to form compounds with eight electrons present on the outermost shell of each atom.
Having six electrons on their outermost shell implies that they need to gain two electrons by bonding to other atoms of other elements. Two examples will suffice here.
Water is formed when an oxygen atom shares an electron with each hydrogen atoms.
Hydrogen sulphide is formed when sulphur share two electrons with two hydrogen atoms. Hence the answer.
Answer:
O, S, Se, Te, Po
Explanation:
Hello,
In this case, when chemical bonds are formed, the valence electrons are the bridge to make it possible, nevertheless, the octet is the limit for the formation of bonds, that is, an element must not exceed 8 shared or gained electrons. In such a way, elements able to gain to electrons to attain the octet are those from the VIA group: O, S, Se, Te, Po, as they have six valence electrons, so two more electrons are suitable for attaining the octet.
Best regards.
what is the name of the element of atomic no 114
Answer:
Flerovium
Explanation:
Answer:
Fl or flerovium. Atomic number is the number above the element on a periodic table.
The equation Mg(NO3)2(aq) + 2KOH(aq) --> Mg(OH)2 (s) + 2KNO3 (aq) is an example of which type of reaction? A) decomposition B) Acid/Base C) Precipitation
Answer:
C) Precipitation
Explanation:
Above reaction forms the precipitate of [tex] Mg(OH)_2[/tex](Magnesium Hydroxide). Hence, it is Precipitation reaction. This reaction is also known as Double displacement reaction.
Please see my other questions
Answer: alr, gimme a sec
Answer:
Okay I will go look at it
What is the pH of a solution of KOH with a hydroxide concentration of [OH⁻] = 1.10 x 10⁻⁴
Answer:
[tex]p[H+] = 10.042[/tex]
Explanation:
As we know that
[tex]pKw = pH + pOH[/tex]......eq (1)
we will calculate the pH of OH- and then we will calculate the pH of H+
So p[OH-] [tex]= - log [1.10 * 10^{-4}][/tex]
Solving the right side of the equation, we get
p[OH-]
[tex]= - [-3.958]\\= 3.958[/tex]
Now we know that
[tex]pKw = 14.0[/tex]
Substituting the value of pOH in the above equation, we get -
[tex]14.0 = p[H+] + 3.958\\p[H+] = 14 - 3.958\\p[H+] = 10.042[/tex]
25.4 g of salt was dissolved in distilled water to make 425 mL of solution.
What is the percent m/v concentration?
25.4 g of salt was dissolved in distilled water to make 425 mL of solution. 5.94 percent m/v concentration.
What is concentration ?The term concentration is defined as a substance is the quantity of solute present in a given quantity of solution. Concentrations are mostly expressed in terms of molarity which is defined as the number of moles of solute in one litre of solution.
Concentration is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.
Concentration = mass / volume
Mass = 25.4 g
Volume = 425ml
Concentration = 25.4 g / 425ml x 100
=5.94 percent
Thus, 25.4 g of salt was dissolved in distilled water to make 425 mL of solution. 5.94 percent m/v concentration.
To learn more about the concentration, follow the link;
https://brainly.com/question/10725862
#SPJ5
The pH of a solution is 6. What is the poH of solution?
Answer:
pOH = 8
Explanation:
There are many formulaes to go from pH to pOH. One of my favorites is this one:
pH+pOH=14 (Now this just becomes an algebra problem because you already know pH value)
6 + pOH = 14 (subtract 6 from both sides)
pOH= 8
2. What are the characteristics of an acid (at least 3)?
Answer:Acids taste sour, react with metals, react with carbonates, and turn blue litmus paper red. Bases taste bitter, feel slippery, do not react with carbonates and turn red litmus paper blue.
Explanation:
Sour taste (though you should never use this characteristic to identify an acid in the lab) Reacts with a metal to form hydrogen gas. Increases the H+ concentration in water.Which could be the catalyst in a chemical reaction?
OA reactants
O B. product
OC. enzyme
OD. activated complex
Answer: C. enzyme
Explanation:
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.
The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.
Enzymes are proteins that reduce the activation energy of biological reaction. Enzymes increase the speed of a reaction and help it to run faster. Thus they are also called as bio catalysts.
Activated complex is the transition state which is very unstable and is formed during the course when reactants are converted to products.
What is the concentration of hydronium ion in a 0.121 M HCl solution?
A) 1.0 M
B) < 0.121 M
C) 0.121 M
D) not enough information
Answer:
C) 0.121 M
Explanation:
HCl + H₂O = H₃O⁺ + OH⁻
.121M .121M
HCl is a strong acid . It will dissociate almost 100 % so the concentration of acid and hydronium ion formed will be equal . It is to be noted that hydronium ion is formed due to association of H⁺ and H₂O . H⁺ is formed due to ionisation of HCl .
So concentrtion of hydronium ion ( H₃O⁺ ) will be .121 M.
The periodic table organize elements based on
Na2S+2AgNO3 = Ag2S + NaNO3 If 2.86g of Ag2S are actually produced by a reaction between an excess of Na2S and 4.27g of AgNO3 then what is the percent yield of Ag2S
A. 3.15%
B. 45.9%
C. 61.2%
D. 91.0%
Answer:
D. 91.0%
Explanation:
Hello,
In this case, for the given chemical reaction:
[tex]Na_2S+2AgNO_3 \rightarrow Ag_2S + 2NaNO_3[/tex]
Next, since silver nitrate (molar mass 169.87 g/mol) is in a 2:1 molar ratio with silver sulfide (molar mass 247.8 g/mol), we compute its theoretical yield as shown below:
[tex]m_{Ag_2S}^{theoretical}=4.27gAgNO_3*\frac{1molAgNO_3}{169.87gAgNO_3} *\frac{1molAg_2S}{2molAgNO_3}*\frac{247.8gAg_2S}{1molAg_2S}\\\\m_{Ag_2S}^{theoretical}=3.11gAg_2S[/tex]
Next, we compute the percent yield as:
[tex]Y=\frac{m_{Ag_2S}^{actual}}{m_{Ag_2S}^{theoretical}}*100\% =\frac{2.86g}{3.11g} *100\%\\\\Y=91.0%[/tex]
Hence, answer is D. 91.0%.
Best regards.
In the image, which reactant is limiting?
Answer:
The black atoms
Explanation:
The measure of how much force is acting on a given area is known as?
Answer:
Pressure
Explanation:
Basically, Pressure equals Force, divided by the area.
The measure of how much force is acting on a given area is known as pressure. It measures how concentrated a force is. The size of the force is represented by a simple relationship: Force = Pressure × Area.
What do you mean by pressure ?The term pressure is defined as the amount of force applied perpendicular to the surface of an object per unit area. It is represented by symbol "p" or P.
Pressure is Force per Unit Area. Pressure also defined as the force on an object that is spread over a surface area. The equation for pressure is the ratio of force and the area where the force is applied.
Force is measured in units of Newtons (N), named after the famous scientist Isaac Newton.
Thus, The size of the force is represented by a simple relationship: force = pressure × area.
To learn more about the pressure, follow the link;
https://brainly.com/question/12971272
#SPJ6
Why do precipitation reactions occur?
Answer:
Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids.
Explanation:
A fatty acid is made of a polar carboxylic acid functional group and _____.
a polar hydrocarbon tail
a nonpolar hydrocarbon tail
a polar ring containing an amino group
A nonpolar ring containing an amino group
Answer:
A fatty acid is made of a polar carboxylic acid functional group and a nonpolar hydrocarbon tail.
Explanation:
A fatty acid is made of fat-soluble components, that consists of a large (more than 4 carbon atoms) aliphatic chain of carbon atoms, with hydrogen atoms and a carboxyl group (-COOH). The named fatty acid is because of the -COOH group.
The chain can be made of carbon atoms with a single bond, (saturated) or with double or triple bonds (unsaturated). When the fatty acid has just one double bond the fatty acid is monounsaturated, and otherwise, if it has multiple double bonds it is polyunsaturated. Fatty acid chains can be different in their lengths and their degree of unsaturation.
Mostly of the tail of the fatty acid is nonpolar and hence, hydrophobic, because the long-chain made of hydrocarbon atoms.
From all of the above, the correct answer is option b: A fatty acid is made of a polar carboxylic acid functional group and a nonpolar hydrocarbon tail.
I hope it helps you!
Which is closest to the volume of 0.20 M sodium hydroxide solution could be made from 20.0 g of solid sodium hydroxide (and an unlimited supply of water)?
A. 1.0 dm3 B. 0.5 dm3 C. 0.25 dm3 D. 2.5 dm3 E. none of these
Answer:
D. 2.5 dm3
Explanation:
Alright, first off, you gotta find how many moles Sodium Hydroxide (NaOH) has.
20.0g NaOH x (1 mol / 40.0g NaOh (got amount from Periodic Table))
Basically, it's 20.0g / 40.0g, which gives 0.5 mol since the grams cancel each other. Then we know the pyramid (mol / M x L) so...
0.5 mol x 0.20 M = 2.5 dm3
Which substance is neutral
A. Baking soda
B. Table salt
C. Soap
D. Lemon juice
Answer:b
Explanation:
9. Mr. James owns 12 gas stations in Newport News. He wants to build a
new gas station on the same block that already has a gas station. There
are 3 other different gas stations near by. He thinks it will allow the
community to have a choice as to which gas to use. What type of
viewpoint does Mr. James have?
O preservationist viewpoint
conservationist viewpoint
developmental viewpoint
Answer:
Option C, developmental view point
Explanation:
A person with preservationist viewpoint will think of only preserving the natural resources and the environment. While a person with a conservationist viewpoint will think of conserving the landscape, architecture, heritage, culture, buildings, rituals, etc.
However, a person with developmental viewpoint will think of developing resources at ease. He/She will prioritize development and comfort of customer above all.
Hence, option C is correct
True or False questions
• Please answer the following questions
1. Water is released from plants & animals
False
—
2.
Water contains 2 atoms or oxygen
3.
Water is found in plants but not in meats
4.
Water can dissolve many substances
Answer:
I did not understand the question
Which is greater the area of a red plate diner has a radius of 6 cm or the area of two yellow plate with a radius of 3 cm each
Answer: Red Plate Dinner
Explanation:
If we calculate them with formula for area of circle([tex]\pi[/tex][tex]r^{2}[/tex]).
Red Plate - [tex]\pi[/tex][tex]6^{2}[/tex] = 36[tex]\pi[/tex]
2 Yellow Plate - 2 * [tex]\pi[/tex][tex]3^{2}[/tex] = 2 * 9[tex]\pi[/tex] = 18[tex]\pi[/tex]
The Red Plate has a bigger area, so the Red plate has more area.
Please mark as brainliest, and take care.
A scientist wants to know how individual lions within a pride interact with each other in their own environment.
To do this, the scientist sedates and tags all of the lions within a pride. Then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. He collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.
This example shows that
A.
observational field studies are not a valid form of scientific investigation.
B.
conditions and variables are best controlled in observational field studies.
C.
there is only one way to acquire scientific knowledge.
D.
not all scientific knowledge is gained through controlled laboratory experiments.
Answer:
Answer Choice D
Explanation:
Study Island Question
PLEASE HELP ASAP, WILL GIVE BRANLIEST!!
The best practice of scientists is to label all containers while they are empty. Why do you think they do that?
Help i don't understand
Answer:so that they may not get confused in which container did they place which chemical since some chemicals are simmilar in colour
Explanation:
The scientists labeled all containers so that they will sure about which container did they put which chemical in since some of the chemicals are similar in color or some are colorless.
What is the labeling in the laboratory?Labeling in a lab is extremely important for many reasons. The laboratory is a fast-paced and efficient work zones due to proper workflow and organization.
Labeling helps to make sure that scientists are working with the correct samples or materials. Without labels, they run the danger of using the wrong chemicals or materials in experiments. This can cause experiments to fail and wastes time, resources, and funds or more than that.
Therefore, it is important for materials to work with by using labeling, as it ensures they are stored in the proper containers. The scientists label the containers to avoid confusion about the material being mixed with other materials.
Learn more about labeling in the laboratory, here:
https://brainly.com/question/28593081
#SPJ2
Los blanqueadores para lavandería, contiene hipoclorito de sodio como ingrediente activo. El clorox por ejemplo contiene aproximadamente 5,2 g de NaClO en 100 ml de solución. ¿cuál en el porcentaje de hipoclorito de sodio en 500 ml de solución?
Answer:
the percentage is 1 every 5
Explanation:
PLEASE IM VERY CONFUSED
Directions: Write the formulas of the reactants and products, including the symbols for the state,
(s), (l), (g), (aq) - then balance the equations.
8. When a solution of hydrogen chloride is added to solid sodium bicarbonate (NaHCO3), the products are carbon dioxide, water and aqueous sodium chloride.
9. Ethyl alcohol (a liquid), C2H6O, burns in air to produce carbon dioxide and gaseous water.
10. Solid titanium (IV) chloride reacts with water, forming solid titanium (IV) oxide and aqueous hydrogen chloride.
11. During photosynthesis in plants, carbon dioxide and water are converted into glucose, C6H12O6, and oxygen gas.
12. Solutions of calcium hydroxide, Ca(OH)2 and nitric acid, HNO3, react to produce water and aqueous calcium nitrate, Ca(NO3)2.
Answer:
8. the formula of the products are CO2(g) , H2O (l) and NaCl (aq)
Explanation:
s- solid
g- gas
l- liquid
aq- aqueous, means acid
These are the products of the equation, you can balance this by searching up a video on how to do so, or use a balance equations calculator online. Balancing is very easy tho.