the bigger the object the more weight of the planet or gravity is acted upon if
If3.91 potassium metal is
allowed to react with oxygen,
O2, the reaction yields 7.11g of k2o.
How much oxygen was reacted?
I
•
What would happen if a person who is wearing a heavy winter jacket were to
place a thermometer inside the jacket next to his or her skin? What would
happen if we took the same jacket, after it had been hanging in a closet, and
placed a thermometer inside?
Answer:
When the thermometer was placed next to the skin, it should be higher because of the heat your body gives off, and the jacket trapping the heat in, when you put it in the closet it will be cooler due to not having a heat source.
THIS IS TIMED!! PLEASE HELP A student has about 250 mL of the liquid acetone. She wants to get a precise and accurate measure of the actual volume of the liquid without losing any. Which of these would be the best instrument to use. 500 mL graduated cylinder (±1mL) 100 mL graduated cylinder (±0.5mL) 250 mL beaker (±5mL) 500 mL beaker (±7mL)
Answer:
500 mL graduated cylinder (±1mL)
Explanation:
Several laboratory glasswares are used in the laboratory, which serves different functions. They include: beakers, volumetric flask, Erlenmeyer flask etc. Beakers are flat-based glasswares used majorly for storing and mixing chemical solutions. Some beakers are also used to measure liquids.
However, graduated cylinders are tall flasks that has graduated markings on it, hence, it is majorly used for measuring liquids. According to this question, a student wants to get a precise and accurate measure of the actual volume of acetone liquid, which is about 250mL.
To do this, the best instrument she can use is a 500 mL graduated cylinder (±1mL). This is because the graduated cylinder holds enough space to contain the liquid and measure it with a level of accuracy better than beakers.
1. The center of the atom is called the
(10 Points)
O nucleus
O protons
electrons
neutrons
Calculate the freezing point of a solution containing 10 grams of KCl and 1100.0 grams of water. The molal freezing point depression constant (Kf) for water is 1.86
Answer:
- 0.454 °C
Explanation:
From the given information:
The mass of KCl = 10 grams
The molar mass of KCl = 74.55 g/mol
The molality can be calculated as:
[tex]Molality \ m = \dfrac{mass \ of \ KCl \times 1000}{molar \ mass \ of \ KCl \times 1100.0}[/tex]
[tex]Molality \ m = \dfrac{10 \ g \times 1000}{74.55 \ g/mol \times 1100.0}[/tex]
Molality m = 0.1219 M
For freezing point depression;
[tex]\Delta T_R = i \times k_f \times m[/tex]
The van't Hoff's Factor (i) for KCl = 2
The molar depression of freezing point constant [tex]k_f[/tex] = 1.86° C/m
∴
[tex]\Delta T_R = 2 \times 1.86 \times 0.1219[/tex]
[tex]\mathbf{\Delta T_R = 0.454^0\ C }[/tex]
However, the freezing point of water is known to be = 0°C
Therefore, the freezing point of the solution
= 0 °C - 0.454 °C
= - 0.454 °C
identify which statement is true
Answer:
I'm sorry to say but there is no statements in this question meaning no one will be able to answer them with out them.. what are the statements?
Explanation:
3. Does matter increase in
mass when mixed with
another substance?
a Yes
b. No
Answer:
b. No
Explanation:
The question above is related to "The Law of Conservation of Mass." This law states that mass is neither created nor can it be destroyed. Even if a particular matter will be mixed with another substance or it undergoes chemical reaction, the mass of the matter will remain the same. Even with a change in phase, the mass of the matter will remain the same.
Which factor is most important to keep the same when looking at the
meniscus to compare the surface tension of different liquids?
A. The intensity of light
B. Type of container
C. Temperature
D. Type of material
Answer:
b. the type of container
Explanation:
Answer:
The type of container
Explanation:
Just took the test
Quickly please! Which is a group of tissues that work together to carry out a common function?
cell
organ
organelle
organ system
In the KHP titration, imagine a student fills his buret with NaOH solution imediately after rinsing it with water and after reading the initial volume, begins the titration. He skips the step in which the buret is rinsed with a small amount of the NaOH. How is this oversight likely to reflect in his calculation of the molarity of the NaOH? Explain your reasoning in detail.
Answer:
Explanation:
Since the student fills up the buret with NaOH without rinsing it with small amount of NaOH , the water that is remaining stuck with the walls of the buret will dilute the solution of NaOH and it will result in lowering the morality of the solution . The molar concentration of the NaOH will no longer remain the same . It will lead to wrong calculation and hence wrong result.
The washing of burette in titration with NaOH solution results in the maintaining the concentration of the NaOH in the solution and allows the correct calculation of the molarity.
What is titration?The titration has been the reaction of the acid with the base resulted in the formation of salt and water and had the neutralization reaction.
The molarity of the base has been used in the analysis of the acid concentration on the neutralization reaction.
The skipping of the step of washing with NaOH resulted in the altering in the concentration of the NaOH with the stuck water on the walls of the burette, and thereby resulted in wrong calculation.
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The wood in my house is crumbling. *
Problem
Hypothesis
Law
Theory
Answer:
Problem
Explanation:
The given statement is a problem. It states the problem that the house of the speaker has been undergoing with. This problem gives rise to the Hypothesis in which the 'why' question is asked. The reason of the crumbling of the wood is stated in the hypothesis. Any reason placed of the happening of the event is stated to be hypothesis.
Point N is on line segment MO. Given NO = 2x – 3, MO = 3x + 5, and
MN = 2x + 3, determine the numerical length of MO.
Answer:
MO = 20
Explanation:
Given that: MO = 3x + 5
MN = 2x + 3
NO = 2x - 3
But,
MO = MN + NO
So that;
3x + 5 = (2x + 3) + (2x - 3)
3x + 5 = 2x + 3 + 2x - 3
3x + 5 = 4x
3x - 4x = -5
-x = -5
Multiply through by minus,
x = 5
Thus,
MO = 3x + 5
= 3(5) + 5
= 15 + 5
MO = 20
The length of MO is 20.
Assume that pure water coexists with its vapor at some temperature in a closed container. What are chemical potentials in water and in vapor and their main contributions in both phases
HELP!! Please answer!
Answer: the % is 99.73 and the mass is 40.986
Explanation:
PLEASE I NEED HELP WITH CHEMISTRY PLEASE ????????
There's no question..
2. Why would a calcium (Ca) atom be larger than a bromine (Br) atom even
though they both have 4 energy levels? *
Within a period, the atom size decreases with increasing group number (from left to right), since the nuclear charge and the number of external electrons increase within the period, but the number of shells does not. The electrons are more strongly attracted to the nucleus and are therefore closer to the nucleus.
Five moles of sulfur dioxide, soz, would consist of how many molecules?
molecules
Need Help?
Answer:
3 x 10²⁴ molecules
Explanation:
A mole is just a name that we use to substitute a number, just like a dozen means 12, a mole means 6.022 x 10²³. This gives us the unit conversion of 6.022 x 10²³ molecules SO₂/1 mol SO₂.
[tex]5molSO2*\frac{6.022 x 10^2^3molecules}{1mol SO2} = 3.011 x 10^2^4moleculesSO2[/tex]
Round to the lowest number of significant figures to get 3 x 10²⁴ molecules SO₂
1. Which of the following are properties of non-metals?
A. mostly solids, dull, brittle, reactive, conductors
B. mostly solids, luster, high density, conductors
C. mostly gases, brittle, dull, low density, insulators
D. solids, luster, brittle, conductors, medium density
Why does the correct lewis structure of Co2 involve a double bond between each of the oxygen atoms and the carbon atom
Answer:
Because both carbon and oxygen are demanded to obey the octet's rule.
Explanation:
Hello.
In this case, recalling the Lewis dot structure of CO₂ which is basically:
[tex]O:=:C:=:O[/tex]
We know oxygen has six valance electron whereas carbon four valence electrons, it means that oxygen needs two electrons in order to attain eight electrons and carbon needs four electrons for the same purpose. In such a way, as carbon dioxide contains one carbon atom and two oxygen atoms we infer that each oxygen is providing two electrons for a total of four to allow the carbon obey the octet as well as oxygen and this is attained via two double bonds.
Best regards.
Compare ionic, covalent, and metallic bonds based on each's strength
Answer:
Covalent bond involves the sharing of electrons, while metallic bonds have strong attractions and ionic bonds involve the transferring and accepting of electrons from the valence shell. The adhering property of an atom, in order to arrange themselves in a most stable pattern by filling their outermost electrons orbit
Explanation:
hope it helps:)
he concentration of H2S in a saturated aqueous solution at room temperature is approximately 0.1 M. Ka1=8.9x10-8 Ka2=1.0x10-19 Calculate the pH of the solution in 2 sig figs
Answer:
PH = 4.0
Explanation:
We are given;
Ka1 = 8.9 × 10^(-8)
Ka2 = 1.0 × 10^(-19)
From the 2 values of K given above, we can see that Ka2 is far smaller than Ka1.
Thus, Positive hydrogen ion (H+) will be majorly formed from first dissociation which is Ka1.
Now, the breakdown of the H2S solution is;
H2S⇌[H+] + [HS−]
Thus;
Ka1 = [[H+] × [HS2^(-)]]/(H2S)
HS2^(-) also has a positive hydrogen ion.
Thus, we can rewrite as;
Ka1 = [[H+] × [H+]]/(H2S)
Ka1 = (H+)²/(H2S)
Concentration of H2S is given as 0.1M. Thus;
8.9 × 10^(-8) = (H+)²/0.1
(H+)² = 0.1 × 8.9 × 10^(-8)
(H+) = √(0.1 × 8.9 × 10^(-8))
(H+) = 0.00009433981
Now, PH is gotten from;
PH = -log (H+)
Thus;
PH = -log 0.00009433981
PH ≈ 4.0
Elaborate on the nuclear model of the atom.
A. The nuclear model describes the atom as protons and neutrons distributed throughout a sea of electrons.
B. The nuclear model describes the atom as electrons uniformly scattered in a positive cloud of protons.
C. The nuclear model describes the atom as a small, negative center enveloped by a cloud of positive particles.
D. The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.
Answer:
D
Explanation:
The nuclear model of the atom was proposed by Ernest Rutherford.
In his submission, the atom consists of a dense positive nucleus with electrons moving round this nucleus as planets move round the sun. He likened his model to the solar system. The nucleus is at the center of this system just as the sun is at the center of the solar system.
Answer:
D.The nuclear model describes the atom as a dense, positive nucleus surrounded by a cloud of negative electrons.
Explanation:
Which 2 main body systems work alongside the digestive system?
What are the building blocks of proteins?
O sugars
O fatty acids
O amino acids
O nitrogen bases
Answer:
amino acids
Hope this helps:)
Answer:
C: Amino Acids on edge
Explanation:
How are ecological islands different from geographical islands as described from the reading in the text?
Answer:
Ecological islands is just a terminology used, since it isn't surrounded by water like an actual island, instead, it's something isolated from other things, which is the same thing as an island in a way:
Island (geographical) - Land isolated from bigger "main" land masses by water.
Island (ecological) - Land which contains certain isolated features (habitat, plants, etc.).
Explanation:
An ecological island is an area of land, isolated by natural or artificial means from its surrounding land while geographical islands are a body of land surrounded by water.
What are ecological islands and geographical islands?An ecological island refers to an area of land which is not necessarily an actual island but isolated by natural or artificial means from the surrounding land. A natural micro-habitat exists on sich lands amidst a larger differing ecosystem.
In artificial ecological islands, all non-native species are eradicated, native species are reintroduced and nurtured, and the natural or artificial border is maintained to prevent the reintroduction of non-native species.
A geographical island is a body of land surrounded by water. Continents are also surrounded by water as they are so big but they are not considered islands. Islands may be categorized as either continental or oceanic.
There are so many islands in the lakes, oceans, and rivers around the world. They vary in climate, size, and the types of organisms that inhabit them.
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Which of the following does not represent a compound?
NaCl
N20
CO2
O2
Answer:
O2
Explanation:
A compound is made of two or more chemical elements. With that in mind, O2 is only one element: oxygen.
Answer:
D. O2
Explanation:
First, let’s define a compound.
A compound is a substance made when 2 or more elements are chemically combined in a fixed ratio.
Now, let’s examine the answer choices.
A. NaCl
• This has sodium (Na) and chlorine (Cl) so it is a compound.
B. N2O
• This has nitrogen (N) and oxygen (O). This is a compound.
C. CO2
• This has carbon (C) and oxygen (O) so this is also a compound.
D. O2
• This only has oxygen (O). A compound needs two or more elements, so this is not a compound.
Therefore, the correct answer is D. O2
What is the GCF of 18 and 30
Answer:
The GCF of 18 and 30 is 6
• What information would you need in order to predict whether transfer of thermal
energy would occur when two objects or materials interact?
Answer:
The temperature of the objects involved.
Explanation:
In order to know whether thermal energy will occur, it is important to consider the temperature of the objects involved.
"Heat" is normally being transferred from an object that is warmer to an object that is cooler. For example, a lighted candle will transfer its heat to a cooler object lying next to it. This is because the molecules in the lighted candle have higher kinetic energy, which means the molecules are moving fast and are colliding with each other. Thus, it is easier for the molecules to transfer to the area with cooler temperature.
This difference in temperature is essential in order for the thermal energy transfer to occur.
The branch of science which deals with chemicals and its bond is called chemistry.
The correct answer to the question is temperature.
"Heat" is normally being transferred from an object that is warmer to an object that is cooler and this property is known as heat transferring.
For example - a lighted candle will transfer its heat to a cooler object lying next to it and it also transfers the heat to the wax beneath it due to which wax of candle melt due to increases in temperature.This is because the molecules in the lighted candle have higher kinetic energy, which means the molecules are moving fast and are colliding with each other. Thus, it is easier for the molecules to transfer to the area with a cooler temperature.
This difference in temperature is essential in order for the thermal energy transfer to occur.
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plz help on both I will mark brainest and explain how you got it
Answer:
as much as i can see i think it goes like this?:
1.H202--> H20+02
Answer is 2,2,1 bc
1.when you add 2 to H202 its 2H202 so H is 4 and O is 4,
2.when you add 2 to H20 its 2H20 so H is 4 and O is 2 (so H is done and good on both sides we have 4 H)
3. and then when you add 1 to O2 its still O2 you dont need to add anything bz when you add the 2O from 2H2O with O2 its 4 O so everything's good (i explained it a bit messy so you can message me if you got questions)
2. Ag20->Ag+ O2
answer is 2,4,1
1.when you add 2 to Ag2O2 it becomes 2Ag2O (so Ag is 4 and O is 2)
2. you add 4 to Ag bc on the left side when you added 2 Ag became 4 so now its equal on both sides (they're both 4)
3.you add 1 (basically dont add anything bc you dont write 1 just leave it as O2) bc on left side you got O2 and the same on right side (if you got questions message me:))
The Adálie penguins feed on krill that live on the underside of ice sheets. Which of the following would help Adálie penguins survive during the melting of Antarctic sea ice?
The correct answer is Migrating farther into the sea
Explanation:
The Adálie penguins rely on ice sheets to obtain food as the krill they feed on is only found underside of the ice. This implies as the Antarctic sea ice melts Adálie penguins need to look for new places to find krill as if there are no ice sheets there are no krill for these penguins. Due to this, it is likely these penguins are forced to migrate or move farther into the sea to survive because it is likely in these zones there are ice sheets and therefore places where they can find krill. Despite this, this process might lead to a significant decline in the population of penguins due to the competence for food and the process of migration itself. Thus, the one that would help Adáline penguins to survive during the melting of Antarctic sea ice is migrating farther into the sea.
Have a nice day! :)
The Adálie penguins feed on krill that live on the underside of ice sheets. Adálie penguins survive during the melting of Antarctic sea ice help migrating farther into the sea. Therefore, option A is correct.
What is migration ?The term migration is defined as the movement of either people or animals from one area to another.
The Adálie penguins rely on ice sheets for food because the krill they eat is only found on the underside of the ice. As a result, it is likely that these penguins are forced to migrate or move further into the sea to survive.
Regardless, this process may result in a significant decline in penguin population due to food competence and the migration process itself.Thus, the one that will assist Adáline penguins in surviving during the melting of Antarctic sea ice is migrating deeper into the sea.
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Your question is incomplete,most probably your question was
The Adálie penguins feed on krill that live on the underside of ice sheets. Which of the following would help Adálie penguins survive during the melting of Antarctic sea ice? Migrating farther into the sea Breeding during summer months Growing strong toe nails to grip ice Spending more time raising their young
