Answer:
physical property
Explanation:
What is the number of electrons in silicon-30
What is the main difference between a physical change and a chemical change? Select all
correct answers. Hint: 2 correct answers.
A. A physical change does not change the substances composition.
B. A physical change changes a one or more substance into a new substance.
C..A chemical change does not change the substances composition.
D. A chemical change changes a one or more substance into a new substance.
Answer:
A, D
Explanation:
A sample of nitrogen gas has a pressure of 6.58 kPa at 539K. If the volume does not change, what will the pressure be at -62°C.
(I will give brainliest. Thank you so much!!)
Answer: 2.576 kPa
Explanation:
Since the volume does not change, the formula: P/T = P/T can be used.
However, all temperatures must be in kelvin, so to convert the -62 Celsius add 273 and get: 211 K.
Now, plug in to the formula: 6.58 / 539 = P / 211 → Cross multiply and then divide to get: P = 2.576 kPa :)
Answer:
the other person gets brainliest <3
Explanation:
Which statements are true of heterogeneous mixtures? check all that apply. they settle out. they exhibit the tyndall effect. their solutes and solvents appear as one. they exhibit brownian motion. they are evenly distributed mixtures.
The statements which are true about heterogeneous mixtures are they settle out, they exhibit the tyndall effect and they exhibit brownian motion.
What are heterogeneous mixtures?Heterogeneous mixtures are those mixtures in which composition of their constituent partiles are not identical or even, they may vary place to place.
In the heterogeneous mixtures, solutes are present unevenly in the solution and this uneven arrangement is also arises the brownian motion means the randon motion of the particles. And these mixtures also shows the tyndall effect as light passes through the suspended particles may get scattered. On placing these mixtures without any motion for a long time, then it may sometimes settle down at the bottom.Hence, options (1), (2) & (4) are correct.
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Answer:
A,B,D
Explanation:
i got it right
A student sets up an experiment to determine how much time will elapse before equal samples of water at 20°C become solid if placed in freezers at four different temperatures. Which are the independent and dependent variables in this experiment? A. the starting temperature of the water, and the water containers used B. the starting temperature of the water, and the time it takes the water to freeze C. the various temperatures in the freezers, and the water containers used D. the various temperatures in the freezers, and the time it takes the water to freeze
Answer:
D. the various temperatures in the freezers, and the time it takes water to freeze
Explanation:
The dependent variable is the variable in an experiment that is subject to being tested and put under observation.
The independent variable is the variable that is changed and altered in order to bring certain effect on the dependent variable.
The various temperatures in the freezers is the independent variable that is subject to change and alteration while the time it takes water to freeze is the dependent variable.
Do you think it's possible for a renewable resource such as water to become depleted or
reach near depletion? Explain.
PLEASE HELP
If you were a robotics engineer, how would you design a prosthetic limb that stretches and releases? Explain the different parts of your design. Think about the following elements in your design:
Apply the relationship between electricity and magnetism to design a simple motor.
Apply the relationship between electricity and magnetism to design a simple motor.
Explain how the motor would cause the tendon to stretch and release.
Answer:
Massachusetts Institute of Technology
Summary:
A new surgical technique could allow prosthetic limbs to feel much more like natural limbs. Through coordination of the patient's prosthetic limb, existing nerves, and an artificial muscle graft, amputees would be able to sense where their limbs are in space and to feel how much force is being applied to them.
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Answer:
The function of tendons can be classified into two categories: tensile force transmission, and storage and release of elastic energy during locomotion. The action of tendons in storing and releasing energy is mainly seen in sports activities with stretch‐shortening cycles (SSCs). The more intense the SSC movements are (jumping‐like activities), the more frequently tendon problems are observed. High SSC movements impose high loads on tendons. Consequently, tendons that frequently deal with high SSC motion require a high energy‐absorbing capacity to store and release this large amount of elastic energy. As the elasticity of tendon structures is a leading factor in the amount of stored energy, prevention and rehabilitation programmes for tendon injuries should focus on increasing this tendon elasticity in athletes performing high SSC movements. Recently, it has been shown that ballistic stretching can significantly increase tendon elasticity. These findings have important clinical implications for treatment and prevention of tendon injuries.
Explanation:
What is incandescence? How is incandescence used to create effects with fireworks?
Answer:
Incandescence is the emission of light caused by high temperature. ... Metals, such as aluminum, magnesium, and titanium, burn very brightly and are useful for increasing the temperature of the firework. Luminescence the emission of light by a substance that has not been heated.
Explanation:
The word incandescence refer to the light produce from heat. When solution is heated it will rise up the light scale through infrared, red and the rest of the color. Fireworks is create by controlling the amount of heat which keep it in one color.
What are fireworks?Fireworks are a class of low explosive pyrotechnic device used for aesthetics and entertainment purpose.
They are commonly used in displays, combining a large number of devices in an outdoor setting.
With increase in sound level it can lead to restlessness, temporary or permanent hearing loss, high blood pressure and sleep disturbance.
Fireworks can also cause respiratory problems such as chronic or allergic bronchitis, asthma etc.
Fireworks release a fine cloud of smoke and particulate matter affecting local area quality.
Thus, the word incandescence refer to the light produce from heat. Fireworks is create by controlling the amount of heat which keep it in one color.
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When you cook food in a hot pan, which statement is correct?
Answer:
the water evaporates
Explanation:
have a good day
Which group of elements are the peaks on the graph?
A. alkali metals
B. alkaline earth metals
C. transition metals
D. halogens
E. inner transition metals
F. noble gases
If energy can only be converted from one type to another, the energy you observe when the tortilla chip burned must have come from another type. Where do you think the energy you observe when the tortilla chip burned came from? What type of energy was it originally?
When you burned the chip, The original source of energy conversions was chemical energy. Which then converted to light, thermal, sound, and kinetic energy.
hello people ~
Name two items that are made from coconut fiber
Answer:
Items that are made from coconut fibers are:
Floor mats, brushes, mattresses, etc.
(You can choose from the options)
Explanation:
Hope this helps
Im new to brainly ^^
Answer: Breads and cakes
what is the final temperature of 520.1 g of water (specific heat =4.18 J/g × °C) at 24.2 °C that absorbed 950 J of heat
Answer:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
Explanation:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
If an asteroid were going to impact Earth, would you prefer to know in advance or let the NEO remain a mystery until impact? Why?
Answer:
I think you're supposed to answer that yourself because it's asking your personal opinion. I'd personally like to know in advance
When two atoms form a covalent bond they share electrons. What are the electrons of one atom being attracted to in the other atom that allows them to bond?
Answer:
The electrons are attracted to the nuclei of both atoms.
Explanation:
Electrons are attracted to nuclei because nuclei are positively charged and electrons are negatively charged. Opposites attract
The genotype is
the amount of each protein that is contained within a cell.
the observable characteristics due to the genes that are present in the cell.
the specific combination of genes contained within the cell.
the combination of a cell's environment and experiences.
Answer:
the specific combination of genes contained within the cell.
Explanation:
ex: AaBg
Someone help me please!!
Answer: See below
Explanation:
For the first molecule, Al3H, there are:
3 bond pairs and 0 lone pairs on the main atom The total number of electron pairs is 3.So, the hybridization of the molecule will be sp2, and the shape according to VSEPR theory will be a trigonal planarFor the second molecule, CH2F2, there are:
4 bond pairs and 0 lone pair on the central atom. TThere are 4 electron pairs Therefore, the hybridization of the molecule will be sp2, and the shape will be tetrahedralFor the third molecule, PH3, there are
3 bond pairs and 1 lone pair. 4 electron pairs. So, the hybridization of the molecule will be sp3. However, the 4th spot on the molecule will be occupied by a lone pair, so the overall shape will be trigonal pyramidal and not tetrahedralFor the final molecule, O3, there are:
2 bond pairs and 1 lone pairs. The number of electron pairs is 3. Hence, the hybridization of the molecule will be sp2. But due to the 3rd position being taken by a lone pair, and the VSEPR theory assuming that electron pairs will sort themselves to decrease the effects of repulsion, the overall shape will be bent and not linear.How do isotopes of a givin element similar
What is the final temperature, in degrees Celsius, when the pressure is 768 mmHg , with no change in the volume and amount of gas
The final temperature, in degrees Celsius, of the gas is 34.62 °C
Gas lawsFrom the question, we are to determine the final temperature, in degrees Celsius
From the Pressure law or Gay-Lussac's law
We have that, for a given mass and constant volume of an ideal gas, the pressure exerted on the sides of its container is directly proportional to its absolute temperature.
Using the formula,
[tex]\frac{P_{1} }{T_{1}} = \frac{P_{2} }{T_{2}}[/tex]
Where P₁ is the initial pressure
T₁ is the initial temperature
P₂ is the final pressure
and T₂ is the final temperature
From the given information,
P₁ = 739 mmHg
T₁ = 23 °C = 23 + 273.15 = 296.15 K
P₂ = 768 mmHg
T₂ = ?
Putting the parameters into the formula, we get
[tex]\frac{739}{296.15}=\frac{768}{T_{2} }[/tex]
Then,
[tex]T_{2} = \frac{768 \times 296.15}{739}[/tex]
T₂ = 307.77 K
Therefore,
T₂ = 307.77 - 273.15 = 34.62 °C
Hence, the final temperature, in degrees Celsius, of the gas is 34.62 °C
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Here is the complete question:
A gas sample has a pressure of 739 mmHg when the temperature is 23 °C. What is the final temperature, in degrees Celsius, when the pressure is 768 mmHg, with no change in the volume or amount of gas?
Which statement explains why the element carbon forms so many compounds?
1
Carbon atoms combine readily with oxygen
2
Carbon atoms readily attract electrons.
3
Carbon readily forms ionic bonds with other carbon atoms.
4
Carbon readily forms covalent bonds with other carbon atoms.
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Answer:
3
Carbon readily forms ionic bonds with other carbon atoms.
Explanation:
What is common ion effect? Explain with reference to the Group 2 reagents.
The dissociation of a weaker acid can be suppressed or stopped by the addition of stronger acids which is known as common ion effect
Let's check about group || reagents
[tex]\\ \rm\rightarrowtail H_2S\longrightarrow H^++S^{2-}[/tex]
[tex]\\ \rm\rightarrowtail HCl \longrightarrow H^++Cl^-[/tex]
Here Hydrogen sulphide is neutralized by a stronger acid HCl
science / which phrase describes the differences between these two liquid ?
Answer:
viscosity
Explanation:
one one left is mercury and the other one is honey right?
Answer:
high surface tension versus low surface tension
Explanation:
hope this helps!^^
What are The factor(s) which help in the prediction of trends in the periodic
table
Answer:
number of protons in the nucleus, number of energy levels, and the shielding effect.
Explanation:
I hope this helps :)
Which of the following is a way that groundwater depletion affects streams? a. Lower water level b. Loss of vegetation c. Wildlife disruption d. All of the above.
The affect of ground water depletion is Lower water level, Loss of vegetation and Wildlife disruption.
What is ground water?The amount of water that is present below the upper surface area of the land, which are not easily accessible is known as ground water.
And this ground water keeps the soil hydrated and responsible for good vegetation by providing many minerals through water, wildlife is also depends on the ground water as they provide survival for many species. If the ground water is deplected then it also affects the flow of streams and lower water level.
Hence option (d) is correct i.e. All of the above.
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Answer
D. All of the above
Explanation
I am single and I would like to know am I going to find my soulmate this year or next year?
The cell is the basic unit of life
and _____________________ in all organisms.
What type of chemical bond is the strongest type of bond?
covalent
ionic
metallic
polar
Answer:
Covalent
Explanation:
Covalent Bonds. Another type of strong chemical bond between two or more atoms is a covalent bond. These bonds form when an electron is shared between two elements and are the strongest and most common form of chemical bond in living organisms.
How many grams of hydrogen peroxide are needed to produce 90. 0 g of water?
2H202 (1) ► 2H20() + O2(g)
Put the numbers into your calculator to find the answer! 90 x 32, then divide by 18.02 x 2. Estimation can tell me that the answer is 79.9, or 80!
When you bring two drops of water near each other and allow them to touch, they combine immediately and become one drop. This happens mainly because
Answer:
This is because water molecules are made of atoms. Atoms may have special ends that attract to each-other magnetically, causing the water to look like it merges into 2 different drops.
Lumps of sodium carbonate react more slowly with dilute nitric acid than powdered sodium carbonate.
Use ideas about collisions to explain why.
Since rate of reaction depends on the surface area of the reactants, lumps of sodium carbonate react more slowly with dilute nitric acid than powdered sodium carbonate.
Factors affecting reaction rateThe rate of reaction is affected by many factors among which is the surface area of the reactants. We must note that the greater the surface area the quicker the rate of reaction.
As such, the surface area of the powdered sodium carbonate is greater than that of the lumps of sodium carbonate. Therefore, lumps of sodium carbonate react more slowly with dilute nitric acid than powdered sodium carbonate. This is because the particles of the powdered sodium carbonate collide more easily with the acid molecules than the lumps of sodium carbonate.
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