Answer:
Yes an atom is a system because,the Bohr or solar system model of the atom states that atoms consist of a nucleus with a number of electrons in orbits around that nucleus, similar to a solar system. People have speculated that perhaps atoms are tiny solar systems.
Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job of cutting through the stains. Marie places masking tape in the dry shower to create 5 sections for her experiment. She sprays one cleaner per section and leaves the remaining section untouched to compare her results. After 30 minutes, and without scrubbing any of the cleaner in, she records her observations. In this example, what is the dependent variable?
Answer:
CUT through the hardwater stains
Explanation:
The dependent variable in an experiment is the variable that the experimenter measures. It is the variable that responds to changes made to the independent variable.
In this experiment, Marie conducted an experiment to test which cleaner will do a better job of cutting through the stains (hard water buildup). She measures the cut through the stain, hence, the CUT is the dependent variable, which is dependent on the cleaner used.
If I added 10 kJ of heat to a 100 g cube of copper and 10 kJ of heat to a 100 g cube of aluminum, which cube would experience a greater change in temperature. Explain your answer in terms of specific heat.
Answer:
The cube of copper
Explanation:
Cube of copper has a lower specific heat than the cube of aluminum. This pretty much shows that the lower specific heat, the higher change in temp.
(yeah i just found out how to do it like a minute ago cos its on my hw)
A cube of copper would experience a greater change in temperature in comparison with a cube of aluminum.
Given the following data:
Quantity of heat = 10 kJ = 10,000 JoulesMass of copper cube = 100 gMass of aluminum cube = 100 gSpecific heat capacity of aluminum = 0.89 J/g°CSpecific heat capacity of copper = 0.39 J/g°C.To determine which cube would experience a greater change in temperature:
Mathematically, quantity of heat is given by the formula;
[tex]Q = mc\theta[/tex]
Where:
Q represents the quantity of heat.m represents the mass of an object.c represents the specific heat capacity.∅ represents the change in temperature.Making change in temperature (∅) the subject of formula, we have:
[tex]\Theta = \frac{Q}{mc}[/tex]
For copper cube:
[tex]\theta = \frac{10000}{100(0.39)}\\\\\theta = \frac{10000}{39}[/tex]
Change in temperature ([tex]\theta[/tex]) = 256.41°C
For aluminum cube:
[tex]\theta = \frac{10000}{100(0.89)}\\\\\theta = \frac{10000}{89}[/tex]
Change in temperature ([tex]\theta[/tex]) = 112.36°C
Based on the above calculations, we can deduce and conclude that a cube of copper would experience a greater change in temperature in comparison with a cube of aluminum.
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Identify arrows pointing to structures containing pi bonds.
The arrows pointing to the structures containing pi bonds can be seen in the image attached below. From the assumed example Butan-1,3-diene , there are two pi bonds.
A bond is an attractive force designated by a dash (---) that holds atoms or ions mutually in a chemical bonding.
Covalent bonds exist in organic chemistry and they are of two types:
sigma bond σ -bondpi bond π-bondThe sigma bond (σ) exists as a single bond that occurs by the overlapping of an s-s atomic orbital or s-p atomic orbital. They can be seen in unsaturated straight chains such as alkane.
The pi bond (π) exists as a double bond or a triple bond that occurs by the overlapping of two unhybridized p-orbitals.
Since the diagram is not given, we use Butan-1,3-diene as an example of the required structure.
From the structure which is attached in the diagram below, we can see that there are two double bonds indicating the presence of pi-bonds.
Therefore, we can conclude that from the assumed example Butan-1,3-diene, there are two pi bonds.
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also what is the arrow a pointing to?
How many dots should be placed around argon in a dot diagram? A) 2 C) 6 D) 8
The number of dots that should be placed around argon in a dot diagram is : ( D ) 8
Argon is a noble gas ( inert gas ) just like helium and neon and they have their outer most shell completely filled with its electrons ( 8 valence electrons ), which makes them non-reactive with any other element or compound.
Every valence electron in the Lewis structure of an atom is represented with a dot therefore the 8 valence electrons in Argon will be represented with 8 dots.
Hence we can conclude that the number of dots that should be placed around Argon in a dot diagram is 8.
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There should be 8 dots placed around argon in a dot diagram. The correct answer is option D.
A dot diagram is a way of representing the valence electrons of an atom using dots around the atomic symbol. Each dot represents one valence electron.
Argon is an element in the noble gas family with atomic number 18.The electron configuration of argon is[tex]\rm 1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6[/tex], which means that it has 8 valence electrons.
In a dot diagram, argon should have 8 dots around it, representing the 8 electrons in its outermost shell.
Therefore, the correct answer is D) 8. Argon has a full valence shell of electrons, so in a dot diagram, it should have 8 dots around the atomic symbol to represent its 8 valence electrons.
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Which two elements non the periodic table are in the same period
The functions carried out by all types of cells are functions that allow the
cell to?
A: create new life
B:adapt to environment
C: sustain life
Answer:
They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body's hereditary material and can make copies of themselves. Cells have many parts, each with a different function
Explanation:Its A
What is the maxlmum number of electrons that can be present in each principal energy level of hydrogen?
Answer:
Two electrons
Explanation:
Durning a chemical reaction, the law of_____ ______ states that the total mass of the products must be equal to the total mass of the recent
Answer: conservation of mass
Explanation:
connexus sience 6 a lesson 10 unit test
Answer:
Whats the qeustion
Explanation:
think pls
How would you finish the last sentence? What would you say to Sherman so he understands that velocity and force are different?
Answer:
Because force is what causes things to move or change while volactiy is when you add more energy and the things volactiy will change.
Explanation:
how many mg are equal to 450 ug?
Answer:
son 0,45 miligramos
Explanation:
espero que te haya dado una buena respuesta
A scientist suggested that the movement of compound
X across a cellular membrane could be sped up by
the addition of enzyme Y. According to Figure 1, an
enzyme speeds the reaction because:
F. the activation energy is lower with the enzyme
than without the enzyme.
G. the activation energy is higher with the enzyme
than without the enzyme.
H. the activation energy is equal with and without
the enzyme.
J. the free energy change is higher with an enzyme
than without enzymes.
uhhhh sorry i have no idea try a different site
Explanation:
Which statement best describes how sediment forms?
A. Loose material is cemented by pressure.
B. Chemical changes cause sediment to compact together.
C. Weathering breaks down rock and other material.
D. Molten rock cools above Earth’s surface.
Answer:
C. Weathering breaks down rock and other material.
Explanation:
Answer:
Weathering breaks down rock and other material.
Explanation:
Have a nice day!!
QUOTE: " Out of the mountain of despair, a stone of HOPE. "- By: Martian Luther King JR.
Diffusion of water across the cell membrane is called ____
a. Diffusion
b. Osmosis
c. Concentration
Answer:
B Osmosis
Explanation:
How do scientists identify the bond type in a compound using the chemical formula
Answer:
How do scientists identify the bond type of a chemical formula? ... By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.
Explanation:
Answer:
There is a couple different ways to determine if a bond is ionic or covalent. By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.
☆ I HOPE ITS HELP YOU ☆How does the number of valence electrons in sodium (Na) compare to the number of valence electrons in calcium (Ca)?
calcium has one more valence electron than sodium.
calcium has 2 valence electrons, sodium has 1.
Answer:
Na has one fewer valence electron than Ca. I did it
Explanation:
other word for kindly
Answer:
other word for kindly is friendly
Answer: affectionately, thoughtfully, generous
If the density of one substance is greater than that of another, the denser substance will _____ when it encounters the less-dense substance. If a substance's density is less than that of another substance, it will _____ on the denser substance.
Answer:
1. Sink
2. Float
Explanation:
Density of a substance refers to its mass per unit volume. Substances are of varying densities. Depending on the density of a substance, it can either sink or float in the presence of another substance with varying density.
If the density of one substance is greater than that of another, the denser substance will SINK when it encounters the less-dense substance. On the other hand, If a substance's density is less than that of another substance, it will FLOAT on the denser substance.
What moon phase will she observe approximately one week later?
O A First quartel
OB Full Moon
OC Waning gibbous
OD New Moon
Answer:
Why does the Moon have phases?
At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).
At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).
The Moon has phases because it orbits Earth, which causes the portion we see illuminated to change. The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 days. The Moon spends the extra 2.2 days "catching up" because Earth travels about 45 million miles around the Sun during the time the Moon completes one orbit around Earth.
At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).
You can create a mockup of the relationship between Sun, Earth, and Moon using a bright lamp, a basketball, and a baseball. Mark a spot on the basketball, which represents you as an observer on Earth, then play with various alignments of Earth and Moon in the light of your imaginary Sun.
When is the Harvest Moon?
The full Moon that occurs closest to the autumnal equinox is commonly referred to as the "Harvest Moon," since its bright presence in the night sky allows farmers to work longer into the fall night, reaping the rewards of their spring and summer labors. Because the equinox always falls in late September, it is generally a full Moon in September which is given this name, although in some years the full Moon of early October earns the "harvest" designation.
Why do we always see the same side of the Moon from Earth?
The Moon always shows us the same face because Earth's gravity has slowed down the Moon's rotational speed. The Moon takes as much time to rotate once on its axis as it takes to complete one orbit of Earth. (Both are about 27.3 Earth days.) In other words, the Moon rotates enough each day to compensate for the angle it sweeps out in its orbit around Earth.
Gravitational forces between Earth and the Moon drain the pair of their rotational energy. We see the effect of the Moon in the ocean tides. Likewise, Earth's gravity creates a detectable bulge -- a 60-foot land tide -- on the Moon. Eons from now, the same sides of Earth and Moon may forever face each other, as if dancing hand in hand, though the Sun may balloon into a red giant, destroying Earth and the Moon, before this happens.
When does the young Moon first become visible in the evening sky?
There is no real formula for determining the visibility of the young Moon. It depends on several factors: the angle of the ecliptic (the Moon's path across the sky) with respect to the horizon, the clarity of the sky (how much dust and pollution gunks it up), and even the keenness of the observer's eyesight.
The young Moon becomes visible to the unaided eye much earlier at times when the ecliptic is perpendicular to the horizon, and the Moon pops straight up into the sky. In these cases, it may be possible to see the Moon as little as 24 hours after it was new, although every hour beyond that greatly increases the chances of spotting it. When the ecliptic is at a low angle to the horizon, and the Moon moves almost parallel to the horizon as it rises, the Moon probably doesn't become visible until at least 36 hours past new.
The record for the earliest claimed sighting of the young crescent Moon is around 19 hours, although most experts are suspicious of any claims of times less than about 24 hours.
Explanation:
The lanthanides and Actinides, Which Include All of the F-block Elements, Display Which Properties?
- They are more reactive than the alkali metals
- They can form cations with various charges
- They have low atomic mass
- They only form ions with a +4 charge
- They form covalent bonds with halides
- They are less reactive than the group 1A elements
How does atomic radius change from left to right across a period in the periodic table? A. it tends to decrease B. it tends to increase C. it first increases, then decreases D. it first decreases, then increases
Answer:
it decreases from left to right
Answer: It’s A. It tends to decrease.
Explanation:
A scientist is studying a piece of cloth from an ancient burial site. She determines that 40% of the original carbon-14 atoms remain in the cloth.
Based on the carbon decay graph (Figure 11.27), what is the approximate age of the cloth?
A.5,000 years
B.8,000years
C.10,000 years
Answer:
The answer is B, 8,000 years.
Explanation:
If you look at the graph, match 40 percent to the 8th line and boom 8,000 years.
8,000years is the approximate age of the cloth. Hence, option C is correct.
What are atoms?An atom contains a central nucleus surrounded by one or more electrons.
carbon-14 dating is also known as radiocarbon dating which is a method of age determination that depends upon the decay to nitrogen of radiocarbon (carbon-14).
Hence, 8,000years is the approximate age of the cloth.
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As one of the periodic trends studied in this unit, reactivity of metals varies in a
predictable manner. Of the elements listed, which one is the most reactive metal and
why?
A:Rubidium because it has a large atomic radius, a low ionization energy, and a low
electronegativity
B:Barium because it has a small radius, high ionization energy, and high
electronegativity
C:Aluminum because it has a small atomic radius and a small number of protons
D:Lithium because it has a smaller radius than most other metals
Q: water is boiled and steam is produced. this is a physical change because the water particles A: a. have turned into something new b. are still water particles c. have reacted with each other d. have been destroyed
Explanation:
The appearance of the water has changed because it has gone from a liquid state to a gas state. This is a physical change because the water particles are still water particles and have not changed their identity.
The form of a frog immediately after hatching: _____
A.Fish
B.Pupa
C.Tadpole
D.Larva
All phase change require energy to be taken away or added.
True
False
Answer:
true
Explanation:
Which biome would be nearest to the equator
What is the acceleration that this box will move? (Don't forget your units)
Answer:
160 I think or 200
Explanation:
the lines are pulling on the same side so you add those
will mark brainliest if its right
Answer:
Rutherford's!
