Answer:
Calculate density
Weight/mass
386
g
Volume
20
cm³
Density
19,300
kg/m³
Explanation:
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.
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:
Which element has atoms that can bond to each other in rings and networks?
Answer:
I believe its Carbon
how does a runoff get polluted.
Answer:
any litter on the ground can be swept up into the runoff. dirty ground water also commonly affects runoff since there are so many chemicals in the ground. farmers especially need to be cautious because teir fertilizers can leak into the ground.
Answer:
Water is polluted by runoff through the action of erosion: removal of surface material from Earth's crust, primarily soil and rock debris from the environment of which the water flows through.
Explanation:
When rain falls onto the earth, it just doesn't sit there, it starts moving according to the laws of gravity. A portion of the precipitation seeps into the ground to replenish Earth's groundwater. Most of it flows downhill as runoff. Runoff is extremely important in that not only does it keep rivers and lakes full of water, but it also changes the landscape by the action of erosion. Flowing water has tremendous power—it can move boulders and carve out canyons; check out the Grand Canyon!
Runoff of course occurs during storms, and much more water flows in rivers (and as runoff) during storms. For example, in 2001 during a major storm at Peachtree Creek in Atlanta, Georgia, the amount of water that flowed in the river in one day was 7 percent of all the streamflow for the year.
Examples
1. That part of the precipitation, snow melt, or irrigation water that appears in uncontrolled (not regulated by a dam upstream) surface streams, rivers, drains or sewers. Runoff may be classified according to speed of appearance after rainfall or melting snow as direct runoff or base runoff, and according to source as surface runoff, storm interflow, or groundwater runoff.
2. The sum of total discharges described in (1), above, during a specified period of time.
3. The depth to which a watershed (drainage area) would be covered if all of the runoff for a given period of time were uniformly distributed over it.
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 statement describes one characteristic of an operating electrolytic cell?
A. It produces electrical energy.
B. It requires an external energy source.
C. It uses radioactive nuclides.
D. It undergoes a spontaneous redox reaction.
Answer:
B
Explanation:
The mechanism of this process: the electrolytic cell converts the electrical energy to chemical energy, using external energy source.
The statement which describes one characteristic of an operating electrolytic cell is it requires an external energy source.
Hence, option (B) is correct answer.
What is Electrolytic Cell ?Electrolytic cell can be defined as an electrochemical device that requires an external source of electrical energy to facilitate a non-spontaneous redox reaction. It converts electrical energy in to chemical potential energy and this process is called electrolysis. In electrolytic cell anode is positive and cathode is negative.
What is Non-spontaneous redox reaction ?A nonspontaneous redox reaction occurs when an external voltage is applied. Electrolytic cell is non spontaneous redox reaction.
Thus, from above conclusion we can say that The statement which describes one characteristic of an operating electrolytic cell is it requires an external energy source.
Hence, option (B) is correct answer.
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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
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.
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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Which of these is a disadvantage of using natural gas A It is not considered safe to use in homes. B Scientists have developed new ways of extracting it C It burns less cleanly than other fossil fuels D Extraction through fracking can contaminate groundwater
Answer:
A
Explanation:
Natural gas is flammable. A natural gas leak in a house can cause potential fires, and inhaling the gas can cause natural gas poisoning.
* Answer B: The fact that scientists have developed new ways of extracting natural gas - is an advantage, not a disadvantage.
* Answer C is wrong, because compared with some other fossil fuels, natural gas emits the least amount of carbon dioxide into the air when combusted -- making natural gas the cleanest burning fossil fuel of all.
* Answer D: the content of the statement is about the production process, not about using of natural gas.
....
Hope this answer can help you. Have a nice day!
Answer:
Explanation:D Extraction through fracking can contaminate groundwater
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
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.
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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 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.
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.
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.
which term describes clusters of light absorbing pigments?
Answer:
The correct answer would be D) chlorophylls.
Explanation:
Chlorophyll refers to the green pigment present in cyanobacteria and chloroplasts of plants and algae. It is the pigment which is able to absorb light which makes it an essential element for photosynthesis.
What is the most common ionic form of fluorine?
Answer: It will usually form the anion F- since it is extremely electronegative and a strong oxidizing agent. Fluorine is a Lewis acid in weak acid, which means that it accepts electrons when reacting. Fluorine has many isotopes, but the only stable one found in nature is F-19.
Explanation:
The most common ionic form of fluorine is the fluoride ion (F-). Fluorine, as an element, is highly electronegative, meaning it has a strong tendency to attract electrons towards itself.
In the process of forming an ion, fluorine gains one electron to achieve a stable electron configuration, resulting in the fluoride ion.
For example, when fluorine reacts with sodium (Na), fluorine gains one electron from sodium to form the fluoride ion (F-) while sodium loses one electron to become the sodium cation (Na+). This forms an ionic bond between the two ions, resulting in the compound sodium fluoride (NaF).
The fluoride ion is also commonly found in compounds such as calcium fluoride and aluminum fluoride . In these compounds, fluorine forms ionic bonds with other elements, resulting in the formation of stable compounds.
Overall, the fluoride ion is the most common ionic form of fluorine due to its high electronegativity and its ability to form stable compounds with other elements.
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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.
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.
Describe how to do a flame test on a sample of a salt
Answer:Hope this helps!
Explanation:
You can use a flame test to help identify the composition of a sample. The test is used to identify metal ions (and certain other ions) based on the characteristic emission spectrum of the elements. The test is performed by dipping a wire or wooden splint into a sample solution or coating it with the powdered metal salt. The color of a gas flame is observed as the sample is heated. If a wooden splint is used, it's necessary to wave the sample through the flame to avoid setting the wood on fire. The color of the flame is compared against the flame colors known to be associated with the metals.
If a compound contains an anion which is the conjugate base of a weak acid, the addition of hydronium ion solubility does what ?
Answer:
The addition of hydronium ion increases the solubility of the salt
Explanation:
When a weak acid, MA dissociates in an aqueous solution, the following products in equilibrium are obtained;
MA ----> M+ + A-
The anion which is a conjugate base will be removed from the solution with the addition of a hydronium ion from an acid: 2H3O+ + 2A- ----> 2HA + 2H20
This distorts the reaction equilibrium. According to Le Chatelier’s principle, more MA will dissolve until in order to restore the previous equilibrium of the reaction.
Therefore, an acidic pH increases the solubility of almost all sparingly soluble salts whose anion is the conjugate base of a weak acid.
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 are five things that gravity does
Answer:
1) It governs the motion of planets around the sun, holds galaxies together and determines the structure of the universe.
2) Gravity is by far the weakest force we know. Gravity only attracts – there’s no negative version of the force to push things apart. And while gravity is powerful enough to hold galaxies together, it is so weak that you overcome it every day. If you pick up a book, you’re counteracting the force of gravity from all of Earth.
3) Gravity and weight are not the same thing. Astronauts on the space station float, and sometimes we lazily say they are in zero gravity. But that’s not true. The force of gravity on an astronaut is about 90 percent of the force they would experience on Earth. However, astronauts are weightless, since weight is the force the ground (or a chair or a bed or whatever) exerts back on them on Earth.
4) Explaining the microscopic behavior of gravity has thrown researchers for a loop. The other three fundamental forces of nature are described by quantum theories at the smallest of scales – specifically, the Standard Model. However, we still don’t have a fully working quantum theory of gravity, though researchers are trying.
5) Gravity might be carried by massless particles called gravitons. In the Standard Model, particles interact with each other via other force-carrying particles. For example, the photon is the carrier of the electromagnetic force. The hypothetical particles for quantum gravity are gravitons, and we have some ideas of how they should work from general relativity. Like photons, gravitons are likely massless. If they had mass, experiments should have seen something — but it doesn’t rule out a ridiculously tiny mass.
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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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
Is peanut butter a renewable resources?
Answer:
Peanut oil is - a renewable resource. So I am not that sure about peanut butter
But since it is peanut oil, my best guess would be yes? It is.
Explanation:
Answer:
I think so... i mean penute oil is, so maybe penute butter is to
Explanation:
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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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.