Explanation:
A student measures the length of a magnesium ribbon three times and records the data as: (a). 23.486 cm, (b). 23.491 cm, (c). 23.511 cm
The labeled value of the magnesium ribbon is 23.490 cm
We need to find the precent error for all the data recorded by the student.
[tex]\text{Percentage error} = \dfrac{|\text{calculated value-actual value}|}{\text{acutal value}}\times 100[/tex]
(a) When the calculated value = 23.486 cm
[tex]\text{Percentage error} = \dfrac{23.486 -23.490 }{23.490 }\times 100\\\\=0.017\%[/tex]
(b) When the calculated value = 23.491 cm
[tex]\text{Percentage error} = \dfrac{23.491 -23.490 }{23.490 }\times 100\\\\=0.0042\%[/tex]
(c) When the calculated value = 23.511 cm
[tex]\text{Percentage error} = \dfrac{23.511 -23.490 }{23.490 }\times 100\\\\=0.0893\%[/tex]
When the calculated value is 23.486 cm, it has least error of 0.017%.
Fill in the blanks with the correct words.
The movement of molecules from an area of low concentration to an area of high concentration occurs in *blank*
transport
In *blank*
transport, molecules move from an area of high concentration to an area of low concentration.
Answer:
1st active transport
2nd passive transport
Explanation:
Obtaining energy from the breaking of chemical bonds in nutrients.
A. Molecule
B. Energy
C. Organism
D. Chemical reaction
E. Matter
F. Cellular respiration
Answer:
D. Chemical Reaction
Explanation:
Meaning: A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a reaction.
A word for material deposited on a filter
Sediment filter
Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. Sedimentation is the deposition by settling of a suspended material.
What color would Sodium fluoride make in a flame test
Distinguish between abiotic and biotic factors. Give examples of each.
Answer:
abiotic factors are nonliving aspects of an environment, such as wind, water, and sunlight, while biotic factors are living things, such as animals and plants in the ecosystem.
Answer:
abiotic- nonliving objects
biotic- living objects
Explanation:
ex for abiotic- rocks, air, water, etc
ex for biotic- dogs, cats, fish, people, plants, etc
The overall charge of a formula unit for an ionic compound ____.
Group of answer choices
A.is always zero (neutral)
B.it is always positive
C.is always negative
D.it may have any value
PLEASE HELPP
will give extra points
Answer:
Answer is A, because inoic bonds are made of Positive and Negative ions, lets take example of NaCl, Since an ionic compound consists of equal number of positive and negative ions, the overall charge of an ionic compound is zero, If it wouldnt be zero there would be any charge on NaCl.
Answer:
A. Is always zero (neutral)
Explanation:
from Google
hope it helps it is old question but I want to write the right answer
What is the frequency of a radar photon with energy 6.80 x 10^-25J? (h = 6.63 x 10^-34 J•s)
Answer:
E=hv where E=energy h=planks constant v=frequency
So, v=E/h
=6.8x10^-25/6.63x10^-34
=1025641026Hz
=1.03x10^9Hz
=1.03GHz
Explanation:
The frequency of radar photon is "1.03 GHz".
According to the question,
Energy,
E = [tex]6.80\times 10^{-25} \ J[/tex]Planks constant,
h = [tex]6.63\times 10^{-34} \ J.s[/tex]The frequency will be:
→ [tex]v = \frac{E}{h}[/tex]
[tex]= \frac{6.80\times 10^{-25} \ J}{6.63\times 10^{-34} \ J.s}[/tex]
[tex]= 1.03\times 10^{9\ Hz}[/tex]
[tex]= 1.03 \ GHz[/tex]
Thus the above response is right.
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The largest element that forms a +3 ion?
Answer:
aluminum ion & iron (III) ion
The elements on the Periodic Table are arranged by ________________.
Answer:
n a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column
Explanation:
atomic mumber
bc it just is now su
Protons and electrons are found in the nucleus of an atom.
True
False
Answer:
False ,
Explanation:
Protons are found in the nucleus , but electrons are found on the outside ( electron cloud )
A student heats a test tube containing a large amount of protein and biuret reagent. She notices a color change from violet to blue. Explain why heating causes a color change
Answer:
Explanation:
Proteins are formed from amino acids that are held together by peptides bonds. We have excess of protein present with Biuret reagent which is a combination of sodium hydroxide(NaOH) and copper sulfate(CuSO4)
The normal color of biuret reagent is blue but when we have protein present in biuret reagent its color will be Violet and when we heat this the protein present in it will gain molecular energy disrupting the peptides bonds present as a result the color changes now to blue which is the original color of the biuret solution this happened because biuret test was used to detect proteins or peptide bond specifically but now they are disrupted hence the color change.
draw the structure of a graphite
A 10.0 g piece of hot metal at 300. °C was dropped into a 150.0 g sample of cooler room temperature water that was initially 25.0 °C. If 6.25 kJ of heat was transferred, what was the final temperature of the water?What was the specific heat of the metal?
Answer:
The final temperature of water is 34.92 ⁰C
The specific heat of the metal is 2357.78 J/kg⁰C
Explanation:
Given;
mass of the hot metal, m = 10.0 g = 0.01 kg
temperature of the hot metal, [tex]t_m[/tex] = 300 °C
mass of water, [tex]m_w[/tex] = 150 g = 0.15 kg
initial temperature of the water, [tex]t_w_i[/tex] = 25.0 °C
heat lost by the hot metal = heat gained by water
Q = 6.25 kJ = 6250 J
let the final temperature of water = T
[tex]Q = m_w C_p_w (T-t_w_i)\\\\T-t_w_i = \frac{Q}{m_wC_p_w}\\\\ T= \frac{Q}{m_wC_p_w} + t_w_i\\\\T = \frac{6250}{(0.15)(4200)} + 25\\\\T = 34.92 ^0 C[/tex]
The final temperature of water is also the equilibrium temperature.
The specific heat of the metal is given by
[tex]Q = mC_p_m (300 - T)\\\\C_p_m = \frac{Q}{m(300 - T)}\\\\ C_p_m = \frac{6250}{0.01(300 - 34.92)}\\\\ C_p_m = 2357.78 \ J/kg ^0C[/tex]
How many grams of boron are in 8.11 moles?
Answer:
87.67720999999963
Explanation:
Answer:
87.67720999999963
Explanation:
A scientist discovers a new organism and is trying to classify it. Which observation would most likely indicate that the organism is an animal? ~:)
Answer:
whether it is heterotrophic
2020 edg
ice is melting at 0 degrees Celsius. Explain how the temperature of the melting ice stays the same while the thermal energy increases.
Because the heat applied to the ice is used to create the state transition rather than raising the temperature of the ice, the temperature stays constant while the ice is melting.
What is temperature ?The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using several temperature scales, which traditionally drew on different reference locations.
When ice melts, it absorbs the energy necessary to raise an equivalent mass of water by 80 degrees Celsius. As the material melts, the temperature stays steady at 0 C.
In contrast to water, which will not change phase at 0°C, ice will experience a phase transition at this temperature, requiring greater energy.
Thus, the temperature stays constant while the ice is melting.
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Cell has a cell membrane and mitochondria but no cell wall.
Animal cells have cell membranes and mitochondria, but only plant cells have cell walls.
As the temperature of a given sample of a gas decreases at constant pressure, the volume of the gas
As the temperature of a given sample of an ideal gas decreases at constant pressure, the volume of the gas: increases in accordance with Charles's law.
Charles law states that when the pressure of an ideal gas is kept constant, the volume of the gas is indirectly proportional to the absolute temperature of the gas.
Mathematically, Charles law is given by the formula;
[tex]\frac{V}{T} =k[/tex]
Where;
T is the temperature of an ideal gas.V is the volume of an ideal gas.According to Charles's law, when the volume of an ideal gas is decreased at a constant pressure, the temperature of the gas is increased and when the volume of a gas is increased at a constant pressure, the temperature of the gas is decreased due of the inverse relationship existing between them.
In conclusion, the temperature of a gas decreases the volume occupied by a gas provided pressure is kept constant in accordance with Charles's law.
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What does the release or absorption of energy indicate?
A chemical change
B neither physical nor chemical changes
C physical change
D physical and chemical changes
Answer:
k Nishant
Explanation:
i think only chemical change
Answer:
chemical change release energy but physical change absorb energy
Which set of elements has similar bonding properties?
Answer:
The vertical side of the periodic table.
Explanation: They have the same number of valence electrons and chemical properties. (I'm not saying it's right just trying to help:) )
You have journeyed to mars and have just encountered a Martian. You want to explain a s'more to the creature. You need to be able to describe a marshmallow. How will you describe it? (Use all your senses to start and then think of its physical properties!)
Answer: The marshmallow is a spongy sweet candy.
Explanation:
The following are the physical characteristics of marshmallow:
1. It is white, pink, or may be in any color.
2. It can be round, square, or rectangular in shape.
3. It can be spongy and elastic.
4. It is dusted with rice flour or sugar powder before it is packed in the packets.
5. It is gummy and takes time in chewing.
What is the mass percent of a sugar solution having 15 g sugar dissolved in 63 g of solution?
Answer:
23.81%
Explanation:
The mass percent of a solution, also known as percentage by weight or w/w%, can be calculated using the formula:
mass percent = (mass of solute / mass of solution) x 100%
In this question;
Mass of solute (sugar) = 15g
Mass of solution (sugar + water) = 63g
Hence,
w/w% = 15/63 × 100
w/w% = 0.2381 × 100
w/w% = 23.81%
Therefore, the mass percent of the sugar solution is 23.81%.
Force must be applied to initiate motion
for an object in:
A.all of the above
B.earth's atmosphere
C.outer space
D.the ocean
Force must be applied to initiate the motion of an object on earth's atmosphere, outer space and the ocean.
According to Newton's second law of motion, the force applied to an object is directly proportional to the product of force and acceleration of the object. The object tends to move in the direction of the applied force.
The formula for this law is written as follows;
F = ma = mg
where;
m is the mass of the objectg is acceleration due to gravity
Due to influence of acceleration due to gravity on objects, a force must be applied to initiate the motion of object located within the places where gravity is felt.
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Which option is an example of a physical change?
A silver tarnishing
B iron rusting
C gasoline burning
D metal denting
Answer:
I believe the answer is metal denting
Explanation:
The other options are chemical changes.
Enjoy your winter break a few more days
How many kilograms do you have with 100g of tortillas
answer:
1 kilogram!
explanation:
hope this helped <3 also if wouldn't mind could you pls give me brainliest? (im trying to level up) thanks! :)
PLEASEEE HELPPPP
Consider the equation:
4A1+302 - 2Al2O3
Is this equation balanced? Why or why not?
The chemical equation is balanced
Further explanationThe chemical equation is said to be balanced if the number of atoms in the reactants and the number of atoms in the product is the same.
Balancing the equation can be done by adjusting the reaction coefficients in the products and reactants and not changing the chemical formula
This method can be done by balancing each atom first by giving a coefficient of 1 on the most complex compound
Reaction
[tex]\tt 4Al+3O_2\Rightarrow 2Al_2O_3[/tex]
To check if this equation is balanced, take a look at the number of each of the atoms in the products and reactants
Al : left=4, right=4O : left=6, right=6Because the number of atoms is the same, it can be said that the chemical equation above is balanced
What occurs when a sample of CO2(s) changes to CO2(g)?
Answer:
Sublimation.
Explanation:
Sublimation occurs when a solid changed directly to gas.
I hope this helps.
Sublimation occurs when a sample of CO₂(s) changes to CO₂(g).
What is sublimation?
When temperature is given to a state of matter it changes it's physical state. When temperature is given to solid state and it changes to gas, then it's called as Sublimation.
Examples of sublimation-
Solid carbon dioxide (dry ice) sublimes everywhere
Naphthalene sublimes easily
Solid iodine sublimes easily
Therefore, sublimation occurs when a sample of CO₂(s) changes to CO₂(g).
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How is Osmosis related to diffusion?
GREETINGS!
Diffusion is a process in which gases or liquid move from higher concentration to lower concentration
Osmosis is a process of movement of water molecules from higher concentration to the lower concentration through semi permeable membrane
SIMILLARITIES OF DIFFUSION AND OSMOSIS
Diffusion and osmosis both are the processes in which molecules move from high concentration to the lower concentration, also they do not require any energy so they both are passive transport examples.
The only dissimilarity is that in osmosis there is semipermeable membrane which Checks the movement of the water molecules ONLY
HOPE THIS HELPS YOU!
In an experimental investigation, the group that is not manipulated by the researcher and is then compared to the experimental group is called the blank? group.
Answer:
The correct answer is - the control group.
Explanation:
The control group is one of two groups that are present in any investigation or experiment which is not getting any treatment as the experimental group gets. It remains constant or in natural conditions instead of influenced by any treatment or factor.
An experimanetal group that is manipulated by the researcher by the independent variable is compared to The control group to see the differences developed by the manipulation or influence.
help u can get brainliest if u answer :)
Answer:
I think its D unless i understand it wrong
