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.
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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.
What is the % of each element in Al2(CrO4)3
Answer:
Al = 13.4% Cr = 38.8% O = 47.7
Aluminium Chromium Oxygen
Please give brainliest.
The percentage composition of each element in aluminium chromate is Al = 6.4% Cr = 38.8% O = 47.7%.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
Percent composition of aluminium-26/401.94×100=6.4%,percent composition of chromium-51.99/401.94×100=38.80%,percent composition of oxygen-192/401.94×100=47.76%.
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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
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]
Ethan has a cupcake tray that holds 24 cupcakes. he has batter for one more cupcake. What limiting factor is this most closely relates to in the environment
Answer:
space
Explanation:
The limiting factor that the illustration closely relates to in the environment is space.
Limiting factors are environmental factors that hinder the population of living organisms living in that environment from reaching their maximum reproductive capacity, also known as biotic potential. Limiting factor include space, foods and other environmental resources such as sunlight, nutrients, etc.
In the illustration, the cupcake tray can only hold 24 cupcakes while Ethan has batter for 25 cupcake. The tray thus is limited in space and as a result, one cupcake batter is left floating. The has limited the production capacity of the cupcake batter.
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
What is the definition of erosion? the process by which sediment settles out of water the soil and rocks deposited by moving water the process by which a river moves soil and rock the waterways that move soil and rock
Answer:
Sediment moves from one place to another through the process of erosion. Erosion is the removal and transportation of rock or soil. Erosion can move sediment through water, ice, or wind. Water can wash sediment, such as gravel or pebbles, down from a creek, into a river, and eventually to that river's delta.
Explanation:
Erosion refers to the washing away or the removal of top soils/rocks by agents such as water, wind, etc.
What is erosion?Erosion is the removal of topsoils or rocks by agents of erosions. These agents include water, wind, waves, and ice.
In water/ice erosion, topmost soils or rocks are washed away and deposited somewhere else, usually in or at the mouth of nearby water bodies.
Wind erosion carries soils/rocks and deposits them somewhere else. The deposition accumulates over a period of time to form different landforms.
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3(x - 2) = 5(x + 4)
Answer:
Uh first of all this is algebra but I'll answer this
First distribute the three and 5 (Multiply them by both terms inside parenthesis.
3x-6=5x+20
Then add like terms
8x=14
Divide 8 by 8 and 8 by 14
x = 14/8
Explanation:
Answer:
The answer is [tex]x = -13[/tex] .
Explanation:
Solve the equation:
[tex]3(x -2) = 5(x + 4)[/tex]
Use Distributive Property:
[tex]3(x -2) = 5(x + 4)[/tex]
[tex]3x - 6 = 5x + 20[/tex]
-Subtract [tex]5x[/tex] from [tex]3x[/tex] :
[tex]3x - 6 -5x = 5x -5x + 20[/tex]
[tex]-2x - 6 = 20[/tex]
-Add both sides by [tex]6[/tex] :
[tex]-2x - 6 + 6 = 20+6[/tex]
[tex]-2x = 26[/tex]
-Divide both sides by [tex]2[/tex] :
[tex]\frac{-2x}{-2} = \frac{26}{-2}[/tex]
[tex]x = -13[/tex]
So, now you have found the answer.
Water was added to 175 mL of a KOH solution until the volume was 250 mL and the molarity was 0.315 M. What was the molarity of the initial concentrated solution?
Answer: The molarity of the initial concentrated solution is 0.450 M
Explanation:
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = Molarity of concentrated KOH solution = ?
[tex]V_1[/tex] = volume of concentrated KOH solution = 175 ml
[tex]C_2[/tex] = concentration of diluted KOH solution= 0.315 M
[tex]V_2[/tex] = volume of diluted KOH solution= 250 ml
Putting in the values, we get:
[tex]M_1\times 175=0.315\times 250[/tex]
[tex]M_1=0.450M[/tex]
Thus the molarity of the initial concentrated solution is 0.450 M
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!
Calculate the amount of heat gained when one 250 gram bottle is heated from 25oC to 30oC. The specific heat of water is 4.18 J/goC
Answer:
5230J
Explanation:
Mass (m) = 250g
Initial temperature (T1) = 25°C
Final temperature (T2) = 30°C
Specific heat capacity (c) = 4.184J/g°C
Heat energy (Q) = ?
Heat energy (Q) = Mc∇T
Q = heat energy
M = mass of the substance
C = specific heat capacity
∇T = change in temperature = T2 - T1
Q = 250 × 4.184 × (30 - 25)
Q = 1046 ×5
Q = 5230J
The heat energy required to raise the temperature of 250g of water from 25°C to 30°C is 5230J
Answer:
The amount of heat gained is 5225 J
Explanation:
The specific heat of a substance is the quantity or amount of heat required to change the temperature of a unit mass of the substance by 1[tex]^{0}C[/tex].
Thus,
Q = mcΔθ
where: Q is the quantity of heat required, m is the mass of the substance, c is the specific heat capacity of the substance and Δθ is the change in temperature of the substance.
From the question, given that: m = 250 g, initial temperature = 25[tex]^{0}C[/tex], final temperature = 30[tex]^{0}C[/tex] and specific heat of water = 4.18 J/g[tex]^{0}C[/tex].
So that; the quantity of heat, Q, required is;
Q = 250 × 4.18 × (30 - 25)
= 250 × 4.18 × 5
= 5225 Joules
⇒ Q = 5225 J
Therefore, the amount of heat gained is 5225 J.
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.
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:
Each nucleus of a cell contains:
genes and chromosomes
genes and chloroplasts
chromosomes and chloroplasts
chlorophyll and chloroplasts
Hi there!
Answer:
Genes and chromosomes
Explanation:
All cells contain Genetic information (or Dna) which is organised into structures called chromosomes.
Chlorophyll are basically green pigments in Chloroplasts and both are only found in plant cells and not all cells
Answer:
a
Explanation:
Is CuS an ionic, non polar or polar covalent bond and why
Answer:
Ionic
Explanation:
Answer:
Ionic Bond
Explanation:
CuS has an ionic bond between it as it it formed by the combination of two ions Cu⁺² and S⁻².
The Law of Conservation of Mass states that if 6 grams react in a chemical reaction, then _____ grams are present after the reaction.
a. 9 grams
b. 12 grams
c. 3 grams
d. 6 grams
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
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 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.
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 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
What are four unusual properties of water that are a direct result of hydrogen bonding
Answer:
The following are the four unusual characteristics of water due to hydrogen bonding:
1. Water exhibits high specific heat as the presence of hydrogen bonds enhances the concentration of energy needed for the molecules to accelerate the speed, thus, elevating the specific heat.
2. Water has both high melting and high boiling points as hydrogen bonds enhance the energy, which is needed at the time of phase change, thus, increasing both the melting and the boiling points.
3. The hydrogen bonds present in the water gives rise to robust intermolecular attractions, therefore, enhancing the surface tension.
4. The hydrogen bonds present in the water makes the water to exhibit high heat of vaporization, that is, of about 41 KJ/mol.
Answer:
High boiling and melting points: Hydrogen bonds increase the amount of energy required for phase changes to occur, thereby raising the boiling and melting points.
High specific heat: Hydrogen bonds increase the amount of energy required for molecules to increase in speed, thereby raising the specific heat.
Lower density as a solid than as a liquid: Hydrogen bonds increase the volume of the solid by holding molecules apart, thereby decreasing the density.
High surface tension: Hydrogen bonds produce strong intermolecular attractions, which increase surface tension.
Which element has atoms that can bond to each other in rings and networks?
Answer:
I believe its Carbon
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.
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Calculate the volume of a gas with a pressure of 100 kPa, if its volume at 120 kPa is 1.50 L.
Answer:
120 kPa = 1.25 L
Explanation:
Because 120/1.50 is 80. And then if you divide 100 by 80, you get 1.25.
1 point
For the reaction below, 100 g of each reactant available. Which reactant is
the limiting reactant? *
2MnO2 (s) + 4KOH (am) + O2(g) + Cl2(g) → 2KMnO4 (am) + 2KCI (cm) + 2 H20 (1)
[Molar Masses: MnO2 =86.9 8/mol; KOH=56.18/mol; O2 = 32.0 /mol; Cl2 = 70.9 %/mol]
кон
Mn02
02
CI2
Answer:
K0H
I guessed and got it right.
Match these questions with the right letter answer choice
1. Large loops of gases
2. Occurs when the layer of our atmosphere are energized
3. An electrically charged mixture of electrons and protons
4. Sunspot regions suddenly connect releasing large amounts of heat and energy
5. When the solar wind affects Earth's upper atmosphere
A. Magnetic Storms
B. Prominence
C. Auroras
D. Solar Flare
E. Solar Wind
Answer:
1, B. 2, E. 3, D. 4, A. 5, C.
Explanation:
The reason why 1 and B match is because large loops of gas makes prominence by the kind of gas they use. This means that whatever kinds of loops they make, this makes this prominence and this concludes that the loops shapes and forms this kind of shape.
The reason why 2 and E match is because Solar Wind does occur, and this happens when our galaxy and atmosphere are energized, meaning that the specific layer was included with these two and Solar Wind. This was made from these two materials which created Solar Wind.
The reason why 3 and D match is because electrically means with wires, and it is a bit digital. Flare can somewhat mean "fast". This means that when they say that it is charged, meaning fast.There are similar meanings.
The reason why 4 and A match is because Magnetic Storms is because storms are part of the weather and by sunspot regions, this also means that this is part of weather, so both of these have to do with weather. This also has to do with sunspot regions because it is large amounts of heat and energy, meaning that this is strong weather just like magnets and storms.
The reason why 5 and C match is because Auroras are part of Solar Wind. This is not the answer Solar Wind because they wouldn't give away the answer in a question. This also means that Auroras is the answer because it affects the upper atmosphere of Earth. This means that they are Auroras since they include Solar Wind but it does not mean that it is Solar Wind, so the answer is Auroras.
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.
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How many molecules of oxygen enter your lungs when you inhale 5.0 mol of oxygen
Answer:
6x10^23
Explanation:
When you inhale 5.0 mol of oxygen, 3.0 × 10²⁴ molecules of oxygen enter your lungs.
We want to know how many molecules of oxygen are contained in 5.0 mol of oxygen.
Step 1: Determine the number of molecules of oxygen in 1 mole of oxygenThe number of molecules in 1 mole is a constant known as Avogadro's number.
What is Avogadro's number?Avogadro's number is the number of atoms or molecules in one mole of a substance, equal to 6.023 × 10²³.
Step 2: Calculate the number of molecules of oxygen in 5.0 mol of oxygen.5.0 mol × (6.023 × 10²³ molecules/1 mol) = 3.0 × 10²⁴ molecules
When you inhale 5.0 mol of oxygen, 3.0 × 10²⁴ molecules of oxygen enter your lungs.
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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.