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
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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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
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.
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
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]
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
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.
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 )
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:) )
I have added 12.0 L of air.To a balloon at sea level(760 torr). If I take the ballon with me to Colorado, where the air pressure is 0.650 atm, what will the new volume of the balloon be?
Answer:
18.46 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V1) = 12.0 L
Initial pressure (P1) = 760 torr
Final pressure (P2) = 0.650 atm
Final volume (V2) =..?
Next, we shall express the pressure in the same unit of measurement.
Thus, 760 torr is equivalent to 1 atm.
Finally, we shall the new volume of the balloon as follow:
Initial volume (V1) = 12.0 L
Initial pressure (P1) = 1 atm
Final pressure (P2) = 0.650 atm
Final volume (V2) =..?
P1V1 = P2V2
1 × 12 = 0.650 × V2
12 = 0.650 × V2
Divide both side by 0.65
V2 = 12/0.65
V2 = 18.46 L
Therefore, the new volume of the balloon is 18.46 L.
What color would Sodium fluoride make in a flame test
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.
Which answer choice describes the noble gases?
Answer:
have a full outer electron shell
Explanation:
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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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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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:
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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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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How many grams of boron are in 8.11 moles?
Answer:
87.67720999999963
Explanation:
Answer:
87.67720999999963
Explanation:
SOMEONE ANSWER IN 2 MINS
Answer:
Sublimation
Condensation
Boiling, or vaporization
help u can get brainliest if u answer :)
Answer:
I think its D unless i understand it wrong
Forces and Motion:Question 10
Which is the best statement about an object in motion?
Select one:
The object will eventually always stop.
0
The object will keep accelerating.
The object will remain in motion until it experiences an unbalanced force.
o
The object will always slow down
Answer: The object will remain in motion until it experiences an unbalanced force.
Explanation: If you know about Newton's law of physics or whatever it is called, you will find that and object will always keep moving, until it is stopped by an outside force.
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.
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%.
draw the structure of a graphite
Example of genetic biodiversity
Answer:
Different breeds of dogs.
Different varieties of rose flower.
Explanation:
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.
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! :)