Answer:
The hot water was better for removing the oil.
Explanation:
You can see that because the mass went down more with the hot water. So, that means that more oil was taken out of the feather with hot water.
Answer:
The mass changed from 1.1grams to 4.5 grams. The appearance is another thing that changed when it got dipped in oil. The feather look like it lost some feathers or the feathers became transparent. The feather just looks soggy and heavier overall. I believe that if Natalia dips the feather covered in oil in cold water, the feather will remain the same. If she were to dip it in hot water, the feather will get rid of the oil mostly. Think about it, in the ocean the water is cold right? So when oil spills in the ocean it will stay there. Hot water is the best to remove the oil from the feather.
Explanation:
Hopefully this will help.
What is concentration if pOH is 8?
A) 1 x 10-8 M
B) 1 x 102 M
C) 1 x 10-2M
D) 1 x 108 M
The answer is A) 1 x 10-8 M.
Use the reaction below for the decomposition of sodium azide
to sodium metal and nitrogen gas.
2NaNg(s) + 2Na(s) + 3N2(g)
What volume of nitrogen at STP is generated by the decomposition of 130.0 g NaNz?
Answer: The volume of nitrogen gas at STP is 44.8 L.
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation for it follows:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ...(1)
We are given:
Given mass of [tex]NaN_3[/tex] = 130.0 g
Molar mass of [tex]NaN_3[/tex] = 65.01 g/mol
Using equation 1:
[tex]Moles of NaN_3=\frac{130.0 g}{65.01g/mol}=2mol[/tex]
For the given chemical equation:
[tex]2NaN_3(s) \rightarrow 2Na(s) + 3N_2(g)[/tex]
By the stoichiometry of the reaction:
2 moles of [tex]NaN_3[/tex] produces 3 moles of nitrogen gas
At STP:
1 mole of a gas occupies 22.4 L of volume
So, 2 moles of nitrogen gas will occupy [tex]=\frac{22.4L}{1mol}\times 2mol=44.8L[/tex] of volume
Hence, the volume of nitrogen gas at STP is 44.8 L.
The table shows the speed of sound in four substances.
Substance. Speed (meters/second)
air. 330
water. 1,498
steel. 5,000
copper. 6,420
Based on this information, which substance has the lowest density?
O A water
O B. steel
C. copper
O D. air
Based on this information, air has the lowest density. Therefore, the correct option is option D.
What is density?The substance's mass every unit of volume is known as its density. Although the Roman letter D may also be used, the sign most frequently used for density. Density is calculated mathematically by dividing mass by volume.
Where m is the mass, V is the volume, and is the density. Density is sometimes roughly characterized as weight every unit volume, while this is incorrect technically; this quantity is much more precisely known as specific weight. Air has the lowest density.
Therefore, the correct option is option D.
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PLZ SOMEONE HELP I’LL MARK AS BRAINLIEST!!!
In an experiment 10 grams of a substance has a volume of 24 cm? What is the
substances' density ?
Answer:
[tex]d=0.417\ g/cm^3[/tex]
Explanation:
Given that,
Mass, m = 10 g
Volume, V = 24 cm³
We need to find the density of the substance. We know that, the density of a substance is given by :
Density = mass/volume
So,
[tex]d=\dfrac{10\ g}{24\ cm^2}\\\\d=0.417\ g/cm^3[/tex]
So, the density of the substance is [tex]0.417\ g/cm^3[/tex].
Which of the following do not contribute to weathering?
A. Rain
2.earthquakes
3. ice
4. wind
Answer:
Earthquakes
Explanation:
Consider the following reaction:
4FeS2 + 11O2 → 2Fe2O3 + 8SO2
When 28.42 grams of FeS2 reacts with 5.44 grams of O2, how many grams of SO2 are formed?
What is the limiting reactant?
What is the excess reactant?
I'm begging
which organism ( grass, prairie, dog, ferret, or fox) do you think is a producer (does not depend on another organism for its food)?
Answer:
grass
Explanation:
Grass is at the very bottom of the food chain and relies solely on sunlight and water, which aren't organisms. I'm going to assume you meant prairie dog because a prairie isn't an organism, but prairie dogs rely on grass for food. Ferrets rely on meat for food (which they get from other animals) and foxes rely on other animals for food as well. Therefore, grass is the only organism that is a producer (gives other organisms food) and doesn't rely on other organisms for food.
Answer:
Grass
Explanation:
A producer or autotroph is an organism that produces its own food. These include plants, algae, and some bacteria. They convert carbon dioxide, water, and light energy from the sun into glucose, a type of sugar that provides energy, in the process of photosynthesis.
The organisms we are given are grass, prairie dog, ferret, and fox. The only plant is grass. Prairie dogs, ferrets, and foxes are all consumers, and depend on other organisms (plants, grass, leaves, or other animals for meat) for food.
Therefore, the producer in this list is grass.How is a radioactive element different from a stable element?
Radioactive elements are the elements into which an atom is very unstable or highly reactive because it is having more energy in its nucleus. stable elements are those who have stable and there shell are properly filled with electrons.
What are radioactive elements and stable elements?Most radioactive chemical elements have one or more radioactive isotopes on the other hand some chemical elements only have one type of radioactive isotopes.
A radioactive element has an unstable nucleus that emits particles in the form of alpha, beta, or gamma radiation and stable element have stable nucleus with no effect of any radiation or energy due to fully filled orbitals.
Bombarding of these radiations has to be done in the nucleus of the element after this the desired element will become a radioactive element. And there is no effect of these rays on stable elements beacuse they are unreactive to this.
The ray of alpha beta and gamma consists of some charges within them and they are radioactive radiations harmful to human eyes.
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The air pressure above a large body of water off the coast of Florida is much higher compared to the air above the coast. What direction would the wind blow in this situation? (i know its kinda easy but im dum please help)
A
from the ocean to the coast
B
from the coast to the ocean
C
from the ocean, vertically into the sky
D
from the coast, vertically into the sky
The direction in which the wind will blow in this situation is from the ocean to the coast and is denoted as option A.
What is Pressure?
This is defined as the force per unit area of a body and the unit is Pascal. We were told that air pressure above a large body of water is higher than the air above the coast.
This will make the wind blow from the ocean to the coast as the ocean has a higher pressure.
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What is considered the human body's largest organ?
Answer:
The skin
Explanation:
The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature.
Consider the statement, “In a chemical reaction, atoms are neither created nor destroyed, only rearranged.” Why is this a statement of the law of conservation of mass?
Answer: The law of conservation of mass is reffering to the fact that energy cannot be created or destroyed. So when you speak about atoms not being created or destroyed it is the same thing. Unless you're talking about an atomic bomb where the atoms are split.
In a chemical reaction, the total mass present is equal to the mass of all the atoms undergoing the reaction.
According to the law of conservation of mass, mass is neither created nor destroyed but can be converted from one form to another. In a chemical reaction, atoms are rearranged. However, the total number of atoms in the system remains constant.
So, the total mass present in the system is equal to the mass of all the atoms undergoing the reaction. Since atoms are only rearranged, no new atom is formed and no atom disappears in the reaction, the total mass of the system remains constant.
For this reason, the statement; “In a chemical reaction, atoms are neither created nor destroyed, only rearranged" is a statement of the law of conservation of mass.
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How much of a 10 M solution is needed to make 1 liter of all solution?
a. 1ml
b. 1000ml
c. 10ml
d. 100ml
Answer:
b is the answer 1000ml
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Which of these would most likely happen to a species that is not able to adapt to a changing environment?
Answer:
If a species cannot adapt to the changes in their ecosystem, they may move to another location. If they will not move, the species may become threatened, endangered or extinct.
Explanation:
The way the question is worded, it sounds like there are options for you to chose from that you are not showing. I could help you out more if I actually knew the options.
Extinction is likely if conditions change faster than a species can evolve, and if members of that species lack the traits required to survive in the new environment.
What is an extinction ?The death of all members of a species of plants, animals, or other organisms is referred to as extinction.
The primary cause of higher extinction rates is habitat loss. Other causes include habitat changes, commercial overexploitation of wildlife, the introduction of harmful nonnative species, pollution, and disease spread.
If a species is unable to adapt to changes in its ecosystem, it may relocate. The species may become threatened, endangered, or extinct if they do not move.
Thus, Extinction is likely if environmental conditions change faster than a species can evolve and members of that species lack the traits needed to survive in the new environment.
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the 3 factors that affect the process of Natural Selection
Answer:
Overproduction of Offspring. The first of these factors that must be present in order for Natural Selection to occur is the ability of a population to overproduce offspring.
Variation.
Selection.
Reproduction of Adaptations.
Explanation:
The equation below represents the equilibrium state of aqueous phosphoric acid.
H3PO4(aq) ↔ H+(aq) + H2PO4-(aq)
Which of the following is equal to the ionization constant Ka?
A
[H2PO−4][H+][H3PO4]
B
[H+][H3PO4][H2PO4]
C
[H+][H2PO−4][H3PO4]
D
[H3PO4][H+][H2PO−4]
Answer:
.
Explanation:
[tex]K_a=\frac{[H_2PO_4^-][H^+]}{[H_3PO_4]}[/tex]
K, the equilibrium constant, is equal to products over reactants raised to their coefficients (excluding solids and liquids and only including aqueous and gasses)
[tex]Ka=\frac{[H_2PO_4^- ][H^+]}{H_3PO_4}[/tex] is the equilibrium constant and is equal to products over reactants raised to their coefficients (excluding solids and liquids and only including aqueous and gasses). Hence, option A is correct.
What is equilibrium?A state of balance between opposing forces or actions.
A number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.
[tex]Ka=\frac{[H_2PO_4^- ][H^+]}{H_3PO_4}[/tex]
K, the equilibrium constant, is equal to products over reactants raised to their coefficients (excluding solids and liquids and only including aqueous and gasses)
Hence, option A is correct.
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Consider the following physical properties and fill in the missing information.
Answer:
I'm going to assume by "tool", you mean the tool best used to measure each factor:
Mass-Tool: scale, Unit: kilogram (kg)
Length-Tool: ruler, Unit: meter (m)
Volume of a regular solid-Tool: equations (there really isn't a physical tool to measure volume of a solid), Unit: cubic meters (m^3)
Volume of a liquid or irregular solid-Tool: beaker, Unit: Milliliters (mL)
Melting and boiling point-Tool: thermometer, Unit: Celsius (C)
Hope this managed to help!
If the temperature and amount of gas stays constant, what will happen to the pressure of a gas if the volume of the container decreases?
Kinetic energy CANNOT be converted into potential energy
True
False
Answer:
false
Explanation:
Answer:
False
Explanation:
Because if you shoot a arrow and go back and get it and use it again it is potential
What is caffeine atomic number?
No links
Answer:
Caffeine has no atomic number
Explanation:
Caffeine is a compound, not an element. Therefore it cannot have an atomic number.
A sample of helium has a volume of 3.49 L at 741 mmHg. What would be the volume if the pressure
were changed to 760 mmHg at the same temperature?
show work
P1: 741 mmHg
V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L
P2: 760 mmHg
V2: ? L
Are elements always the product of a decomposition reaction?
The pure form of an atom present in a sample is called the element. No, elements are not always the product of the decomposition reaction.
What is decomposition reaction?Decomposition is a chemical reaction in which the compound or the molecule breaks to produce two or more products. The general reaction can be given as,
[tex]\rm XY \rightarrow X+ Y[/tex]
And,
[tex]\rm compound \rightarrow element + element[/tex]
The splitting of metal hydroxide into the water and metal oxide is an example of a decomposition reaction. Elements can be found in the free state.
Therefore, the statement is incorrect.
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Explain why gases such as the oxygen found in tanks used at hospitals are compressed. Why must care be taken to prevent compressed gases from reaching a high temperature?
Answer:
Large amount of gas can be stored in small container.
Explanation:
They are compressed so that a larger amount of gas can be stored in a smaller container. A greater mass confined to a smaller volume makes transporting and storing of gases easier. Increasing temperature increases pressure, and the cylinders might explode.
how many moles in 200 grams of Br
Suppose you see a crescent Moon. How do you know if it is waxing or waning?
Answer:
waxing is in the evening and waning is in the morning if you cant see the moon in the evening it is waning if you can see it in the evening it is waxing
Chemical properties of matter depend mostly on what?
Answer:
the types of atoms and bonds that a substance contains
Explanation:
Answer:
the types of atoms and bonds that a substance contains
Explanation:
How many grams are in 4.00 moles of glucose, C6H120
Answer:
[tex]molar \: mass = (6 \times 12) + (12 \times 1) + 16 \\ = 100 \: g \\ 1 \: mole \: weighs \: 100 \: g \\ 4.00 \: moles \: will \: weigh \: (4 \times 100) \: g \\ = 400 \: g[/tex]
If the Earth is at a perpendicular angle or right angle to the sun we will be experiencing...??
plz hurry!!
Answer:
angle
Explanation:
let us see the sun moves an a angle
Jaclyn's coffee was too hot to drink so she placed the cup in the freezer for 10 minutes. What did Jaclyn know about heat that caused her to take this action?
Answer:
Jaclyn knew that Hot temperatures are cooled when out into a colder area.
help me please this is chemistry
If the chemist mistakenly makes 250 mL of solution instead of the 200 mL, what molar concentration of sodium nitrate will the chemist have actually prepared? Answer in units of M.
Answer:
0.120M is the concentration of the solution
Explanation:
Assuming the mass of sodium nitrate dissolved was 2.552g
Molar concentration is an unit of concentration widely used in chemsitry defined as the moles of solute (In this case NaNO3) in 1L of solution.
To find this question we must find the moles of NaNO3 in 2.552g. With this mass and the volume (250mL = 0.250L) we can find molar concentration as follows:
Moles NaNO3 -Molar mass: 84.99g/mol-
2.552g * (1mol / 84.99g) = 0.0300 moles NaNO3
Molar concentration:
0.0300 moles NaNO3 / 0.250L =
0.120M is the concentration of the solution