Answer:
B stores food, water and waster
need help with these questions
Answer:
I don't know the answer sorry
CCC Systems and System Models Liquid gallium changes to a gas at 2229°C.
Describe how a model of gaseous gallium would compare to the model of liquid
gallium shown in the picture.
Gaseous gallium will consist of atoms separated from each other by a large distance and do not experience inter-particle attractive forces.
There are three states of matter;
SolidLiquidGasMatter can exist in all these states of matter depending on the extent of inter-particle attractive forces in the substance.
Inter-particle attractive forces are strongest in solids hence they have a definite shape and volume and do not flow.
Liquids have weaker inter-particle attractive forces than solids hence liquid particles can flow. Liquids have a definite volume but not a definite shape.
Gases have almost no inter-particle attractive forces between particles hence gas particles are separated by large distances and move at very high velocities. A gas does not have definite shape or volume.
A model of gaseous gallium will show atoms of gallium separated by large distances and do not experience inter-particle attraction.
A model of gas particles is shown in the image attached to this answer.
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What caused the ice cube to melt? What do you think is happening to the particles on the inside of the ice cube as it melts?
Answer:
Ice melts when heat is provided to it.
Explanation:
When heat is provided, the kinetic energy of the particles increases. The particles start vibrating. As you keep providing heat, the particles start vibrating more strongly and with greater speed. Some particles become so energetic, that they are able to break the force of attraction and move away as a liquid.
Hope this helps.
Hi, I need help please :)
(30 POINTS)
Which of the following increases the concentration of OH- ions?
Acid
Base
Water
Salt
Answer:
Acid btw I am new in Brainly
4. Write down the differentiate between a. Atom and molecules
Answer:
Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.
Explanation:
Atom refers to the smallest constituent unit of a chemical element. Molecules refer to a group of two or more atoms that are held together due to chemical bonds.
Answer: Atoms are single neutral particles while molecules are neutral particles made of two or more atoms bonded together
fog forma when vapor changes to the what state of matter
George Washington yugg
The observed mass of the sun is 6.270 * 10 ^ 26 g but the actual mass of sun is 5.97*10^ 24 kg . The percent error in measurement is 4,78 %
Answer:
False hoge iska answer
Explanation:
Please follow me
A measure of the average kinetic energy of particles is
length
temperature
mass
volume
Use the word stable to explain why the alkali metals tend to lose 1 valence electron.
Answer:
becoz vvv is always with you
Answer:
Alkali metals have one valence electron on their outer shell. They are more stable when they have eight valence electrons so they tend to loose that one electron and obtain a full octet, therefore become stable
This is my cookie >:( you cannot have it
(Also the question of the cookie is it homogeneous or heterogeneous? DONT EAT IT [its mine])
There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?
Answer:
three stable isotopes
Neon has three stable isotopes: 20Ne (90.48%), 21Ne (0.27%) and 22Ne (9.25%). Ne and 22Ne are partly primordial and partly nucleogenic (i.e. made by nuclear reactions of other nuclides with neutrons or other particles in the environment) and their variations in natural abundance are well understood.
The statement that is true is the charge of all isotopes are same. The correct option is D.
What are isotopes?Isotopes are members of an element family that have the same number of protons but differ in terms of neutrons.
The atomic number of an element on the Periodic Table is determined by the number of protons in its nucleus.
There are three isotopes of neon. Since there is no significant global production of these isotopes, the more plentiful 20Ne and 22Ne are essentially all primordial.
Isotopes can form naturally through radioactive decay of a nucleus or unnaturally by bombarding a stable nucleus with charged particles in a nuclear reactor using accelerators or neutrons.
Thus, the correct option is D as they all have same charge.
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Your question seems incomplete, the missing options are:
- the atomic mass of the three isotopes is the same
-the three isotopes are all radioactive
-the three isotopes are equally abundant in nature
-the charge of all isotopes is the same
What would happen if you poured gasoline into water? *
the gasoline would float on top of the water
the water would float on top of the gasoline
the gasoline would be suspended in the middle of the water
the water would be suspended in the middle of the gasoline
Which statement accurately describes test tubes and beakers?
A.Beakers and test tubes both have rounded bottoms.
B.Test tubes are better for transferring liquids than beakers.
C.Beakers have liquid volume (mL) markings on the side of them; test tubes are unmarked.
D.Beakers can be held over a flame; test tubes cannot.
Beakers are flat bottom laboratory glassware that can be used to hold liquid in the laboratory. A test tube is a laboratory glassware that is unmarked and can be used to heat a liquid over a flame.
The correct answer is option C: Beakers have liquid volume (mL) markings on the side of them; test tubes are unmarked.
Several glassware are very useful in the laboratory especially when dealing with liquids.
Two among these important glassware are beakers and test tubes. A beaker is mostly used to hold liquids while a test tube is used to both hold and heat liquids if need be during a laboratory experiment.
Beakers are graduated by the side while test tubes are unmarked.
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The birdseed above is a mixture of several different types of sizes of seeds. Is the mixture a…
A) homogeneous
B) heterogeneous
Answer:
Answer B: Heterogeneous
Explanation:
im pretty sure this is it if its not im really sorry
35. A line graph uses_ on the x-axis
a. categories
b. time
C. dependent variable
d. control group
Some movements of air are caused by the temperature of the air. Which of the following is a TRUE statement?
A Warm air rises because its molecules are farther apart, making it less dense.
B. Cold air mixes with warm air because the densities of cold and warm air differ.
C. Cold air rises because its molecules are closer together, making it less dense.
D. Warm air pushes cold air aside because warm air is denser than cold air.
Why is cutting a piece of paper considered a PHYSICAL change?
A- even though the paper is in smaller pieces, each piece is still paper
B- cutting the paper causes it to change to a different substance, such as coal
Answer:
A
Explanation:
The answer is A
this apparently needs to be 20 characters long so there
Answer:
A - even though the paper is in smaller pieces, each piece is still paperExplanation:
Physical change - is a type of change in an object's physical look like: color, size, height. But it is still the same object and won't became into something.Example: Putting a red food coloring in the water.[tex]\tt{ \green{P} \orange{s} \red{y} \blue{x} \pink{c} \purple{h} \green{i} e}[/tex]
If you place a glass rod over a burning candle, the glass turns
black. What is happening to each of the following (physical
change, chemical change, both, or neither) as the candle burns?
Explain.
a. the wax
b. the wick
c. the glass rod
(i mainly just need the whether or not it is a chemical or physical, or both, change or not.)
If you place a glass rod over the burning candle, the glass turns black. The happening in the following substances are:
a. the wax is a both.
b. the wick is neither
c. the glass rod is a physical change.
What are chemical and physical reactions?Chemical reactions are those in which the substance changes its composition and totally transformed into a new substance. A chemical reaction involves reactants ad products.
Physical changes are temporary or permanent. Due to changes in the temperature or environment, some matter changes its shape and size.
Thus, the reactions are:
a. the wax is a both; Physical change-solid to liquid. Chemical change-burned to CO2 + H20 + heat + carbon as seen as black on the rod.
b. the wick is neither; the wick does not change, just provides a conduit for the wax to flame
c. the glass rod is a physical change; the carbon is only deported.
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Which of the following correctly
describes a physical change in
matter?
A. matter keeps its chemical makeup, but a
change in size, shape, volume, or state of matter
occurs
B. particles leave and a new substance is made
C. a new substance is formed by atoms
combining in different ways
Answer:
the option A is right matter keeps it's chemical makeup like size shape volume and state
What method of measuring volume of these objects would be most accurate and why?
Answer:
where are the object
Explanation:
can you have a look at your question
an oven adds 2260 j heat to a zinc tray that weighs 195g of the tray starts at 25 what is the final temperature of the tray
Answer: Assuming 25 is 25C, 54.9C
Explanation: The specific heat of zinc is 0.388 J/gC. With 195 grams, we see that for the whole tray, the temperature will change by 1 C for every 75.66J, since (0.388J/gC)*(195g) = 75.66 J/C.
Thus, (2260J)/(75.66J/C) = 29.9 C increase. Add that to 25 to yield 54.9 C (or K, if the 25 was in Kelvin).
When using an electronic device, such as an electronic balance, the measurement displayed on the screen is assumed to have one estimated digit included. in fact, you'll often sec the estimated digit changing rapidly, because there is fluctuation in the estimate. Explain why it is important to record the zero in the measurement shown to this right,
The zero calibration of the electronic balance allows to maintain the precision of one digit.
Electronic measurement equipment has a mechanism to set the zero of the measurement every time the equipment is turned on, this procedure must be carried out to eliminate:
Possible existence of some material on the plateChanges in the characteristics of the balance completes due to agingCchanges in ambient conditions, for example temperatureChanges in the mass of the plate due to deformation or breakage.
The methods of regurgitating the zero of the balance consists of measuring the weight without masses and bringing this value to zero, in general by changing some adjustable parameter of the balance, for example magnetic field current, reference level with a beam of light.
With this calibration it will be achieved that there is always a precision digit in the readings.
With Electronic Balance Calibration it is possible to have a pressure digit
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Answer:
The zero is the estimated digit.
Explanation:
If the zero was left off of the measurement, people would assume the tenths place was the estimated digit.
Which phrase is the best definition of matter?
A. The amount of physical material in an object
B. Anything that takes up space and has mass
C. Anything that can be measured
D. A particle made up of two or more atoms
SUE
The amount of physical material in an object
van dar waals are the dominant molecular force in the sodium chloride.
Answer:
Recall the two conceptual steps necessary to dissolve a solute and form a solution
Key Points
There are two conceptual steps to form a solution, each corresponding to one of the two opposing forces that dictate solubility.
The first conceptual step is dissolution, which corresponds to the force of the solvent-solvent and solute-solute intermolecular attractions that needs to be broken down.
The second conceptual step is solvation, which corresponds to the force of the solute-solvent intermolecular attraction that needs to be formed in order to form a solution.
Many intermolecular forces can contribute to solvation, including hydrogen bonding, dipole-dipole forces, Van Der Waals forces, and ion-dipole interactions.
Term
intermolecular forcesattractive and repulsive forces between molecules
The strength of the intermolecular forces between solutes and solvents determines the solubility of a given solute in a given solvent. In order to form a solution, the solute must be surrounded, or solvated, by the solvent. Solutes successfully dissolve into solvents when solute-solvent bonds are stronger than either solute-solute bonds or solvent-solvent bonds.
Qualitatively, one can determine the solubility of a solute in a solvent by using the rule “like dissolves like”. In general, solutes whose polarity matches that of the solvent will generally be soluble. For example, table salt (NaCl) dissolves easily into water (H2O) because both molecules are polar.
Intermolecular Forces and Their Importance in Solution Formation
There are two conceptual steps to form a solution, each corresponding to one of the two opposing forces that dictate solubility. If the solute is a solid or liquid, it must first be dispersed — that is, its molecular units must be pulled apart. This requires energy, and so this step always works against solution formation (always endothermic, or requires that energy be put into the system).
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A material that resists changes in shape and volume would be
A. solid
B. liquid
C. gas
D. plasma
Answer:
solids
Explanation:
solids aren't very malleable of prone to change shape and/or volume so...
Steel is element, compound, heterogeneous mixture, solution, suspensión or coloideo.
Answer:
Steel is an example of a solid-solid solution (aka an alloy).
Explanation:
If you have 48 ounces of eggs, how many dozens of eggs do you have?
El desplazamiento de la Tierra alrededor del Sol se conoce como
Answer:
Hola Amigas y Amigos
Explanation:
La Tierra gira alrededor de su eje, al igual que una peonza gira alrededor de su eje. Este movimiento giratorio se llama rotación de la Tierra. Al mismo tiempo que la Tierra gira sobre su eje, también orbita o gira alrededor del Sol. Este movimiento se llama revolución.
¡¡Espero que esto ayude!!
iiTen un día maravilloso!!
Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments?(1 point)
Atoms can form new substances.
Atoms are indivisible.
Atoms are small.
Atoms can join together.
The part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments is; "Atoms are indivisible".
One of the major postulates of the Dalton's atomic theory is that the atoms of elements are "indivisible".
This idea resounds from the earliest ideas of Greek philosophers concerning the atom.
Through the cathode-ray tube experiments, J.J. Thomson discovered sub-atomic particles.
This nullified the idea that atoms are indivisible.
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