Answer:
3
Explanation:
Describe Thomson’s and Millikan’s contributions to atomic theory.
Answer:
Thomson passed an electric current through sealed glass tubes filled with gases. Thomson concluded that electrons must be parts of the atoms of all elements. Millikan determined the charge and mass of the electron.
Explanation:
Thompson discovered electrons and proposed the plum - pudding model of the atom. Millikan measured the charge to mass ratio of an electron.
In the early days of the atomic theory, working with his cathode ray tube, J.J Thompson discovered electrons. His discovery of electrons led him to propose a model which depicted the atom as a sphere of positive charges into which negative charges were embedded. This is the plum-pudding model of the atom.
Using his famous oil-drop experiment, R.A Millikan successfully measured the charge to mass ratio of the electron and thereby determined the magnitude of charge on the electron.
Learn more: https://brainly.com/question/11527546
Seaweed attached to rocks in the ocean performs photosynthesis underwater. Which statement best explains how some seaweed can survive in very deep and dark places in the ocean? It can use a small amount of sunlight for photosynthesis. It can use a small amount of sunlight for photosynthesis. It moves to the upper levels of the ocean to get sunlight for photosynthesis. It moves to the upper levels of the ocean to get sunlight for photosynthesis. It does not need any sunlight to perform photosynthesis. It does not need any sunlight to perform photosynthesis. It produces its own sunlight to perform photosynthesis. It produces its own sunlight to perform photosynthesis.
Answer:
It can use a small amount of sunlight for photosynthesis
Explanation:
Seaweeds are a group of marine plants/algae that grow attached to rocks underwater. However, despite their depth underwater, they still perform photosynthesis, which is a process that requires energy from sunlight.
Seaweeds are able to perform photosynthesis underwater because they are efficient users of sunlight energy. Hence, they require only a small amount of sunlight that penetrates the ocean to perform photosynthesis.
Explain how the igneous rock granite forms. Then tell how the granite might become the sedimentary rock sandstone and then the metamorphic rock quartzite.
Answer:
There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle. Sedimentary Rocks Sedimentary rocks are formed from pieces of other existing rock or organic material. There are three different types of sedimentary rocks: clastic, organic (biological), and chemical. Clastic sedimentary rocks, like sandstone, form from clasts, or pieces of other rock. Organic sedimentary rocks, like coal, form from hard, biological materials like plants, shells, and bones that are compressed into rock. The formation of clastic and organic rocks begins with the weathering, or breaking down, of the exposed rock into small fragments. Through the process of erosion, these fragments are removed from their source and transported by wind, water, ice, or biological activity to a new location. Once the sediment settles somewhere, and enough of it collects, the lowest layers become compacted so tightly that they form solid rock. Chemical sedimentary rocks, like limestone, halite, and flint, form from chemical precipitation. A chemical precipitate is a chemical compound—for instance, calcium carbonate, salt, and silica—that forms when the solution it is dissolved in, usually water, evaporates and leaves the compound behind. This occurs as water travels through Earth’s crust, weathering the rock and dissolving some of its minerals, transporting it elsewhere. These dissolved minerals are precipitated when the water evaporates. Metamorphic Rocks Metamorphic rocks are rocks that have been changed from their original form by immense heat or pressure. Metamorphic rocks have two classes: foliated and nonfoliated. When a rock with flat or elongated minerals is put under immense pressure, the minerals line up in layers, creating foliation. Foliation is the aligning of elongated or platy minerals, like hornblende or mica, perpendicular to the direction of pressure that is applied. An example of this transformation can be seen with granite, an igneous rock. Granite contains long and platy minerals that are not initially aligned, but when enough pressure is added, those minerals shift to all point in the same direction while getting squeezed into flat sheets. When granite undergoes this process, like at a tectonic plate boundary, it turns into gneiss (pronounced “nice”). Nonfoliated rocks are formed the same way, but they do not contain the minerals that tend to line up under pressure and thus do not have the layered appearance of foliated rocks. Sedimentary rocks like bituminous coal, limestone, and sandstone, given enough heat and pressure, can turn into nonfoliated metamorphic rocks like anthracite coal, marble, and quartzite. Nonfoliated rocks can also form by metamorphism, which happens when magma comes in contact with the surrounding rock. Igneous Rocks Igneous rocks (derived from the Latin word for fire) are formed when molten hot material cools and solidifies. Igneous rocks can also be made a couple of different ways. When they are formed inside of the earth, they are called intrusive, or plutonic, igneous rocks. If they are formed outside or on top of Earth’s crust, they are called extrusive, or volcanic, igneous rocks. Granite and diorite are examples of common intrusive rocks. They have a coarse texture with large mineral grains, indicating that they spent thousands or millions of years cooling down inside the earth, a time course that allowed large mineral crystals to grow.
Alternatively, rocks like basalt and obsidian have very small grains and a relatively fine texture. This happens because when magma erupts into lava, it cools more quickly than it would if it stayed inside the earth, giving crystals less time to form. Obsidian cools into volcanic glass so quickly when ejected that the grains are impossible to see with the naked eye. Extrusive igneous rocks can also have a vesicular, or “holey” texture. This happens when the ejected magma still has gases inside of it so when it cools, the gas bubbles are trapped and end up giving the rock a bubbly texture. An example of this would be pumice.
Explanation:
oh and also nice profile pic :P
Determine the mass of 31.4 moles of Sodium.
Answer:
721.9 grams
I hope this helps!
Which statement best describes how to predict the formula of a stable ionic compound?
A) Use the same number of cations as anions so that the compound is neutral.
B) Use more cations than anions so that the compound is positively charged.
C) Use enough cations and anions so that the total charge is zero.
D) Use fewer cations than anions so that the compound is negatively charged.
Answer:
C ; Use enough cations and anions so that the total charge is zero
in a stable ionic compound, in order for you to get the formula, you need the positive and negative ions on one side to cancel out the compound, it becomes neutral, by being 0.
i hope that made sense :/
Answer:
c
Explanation:
In an atom, the number of protons equals the number of
A.nuclei.
b. electrons.
neutrons.
d. isotopes.
c.
The number of protons is equal to the number of electrons.
What are the 2 types of lava?
Answer:
pahoehoe and aa
Explanation:
this is real and is no joke
What is the rule of zero charge?
Answer:
The nonmetal atoms accept electrons and form ions with a negative charge, called anions. When an ionic compound forms, the total charge on the atoms adds up to zero. This is known as the rule of zero charge.
Explanation:
Which set of elements is in the order of decreasing/ increasing malleability? (Questions: 7 & 8)
Answer:the first answer is correct and 8 is O, Ge, Mn
Explanation:
If an object has a density of 0.35 g/mL, what is that density in cg/L?
if a man could fall through a hole that passes through the center of Earth, gravity would cause him to:
A.Gain speed until he reached the other end of the tunnel.
B. Stop falling at the center of Earth.
C. Gain speed until he passed the center and then lose speed until he reached the other side.
The millions of fossils that scientists have collected are called the fossil __.
Answer:
record
Explanation:
what are parts in the human stomach
I hate chemistry please help
Answer:
Love it because Love it
Explanation:
does anyone know how to do this thanks
Answer:
I don't know how to do this
sorry I can't able to help you
Explanation:
[tex]hii[/tex]
have a nice day ✌️
Elements can be described by their properties. Some of these properties are physical properties and some are chemical properties Observe the list provided. Which one of these contains ONLY Cchemical properties
A) C,E,F
B) B,C,E
C) B, E, F
D) C,D,E
Its a c,e,f
Sadly i got it wrong
Flammability, Ability to rust and Ability to tarnish (C,E,F) are chemical properties of an element.
The property of an element is the characteristic feature of that element which helps us to differentiate it from another element.
We have
The Physical proprieties- These are features of an element which we can identify by sight and touch, Some of them include colour, hardness, boiling and ,melting point, size etcChemical properties These are the features of an element which w\e observe when the element has undergone a chemical change which changes its composition. Examples are Flammability, rust, tarnish , corrosion etc.See more here:https://brainly.com/question/2116116
10. If the number of particles in the left box above were doubled, what would happen to the pressure of the
gas? Explain.
A. The pressure of the gas on the left would decrease because the number of collisions would also
decrease.
B. The pressure of the gas on the left stay the same because the number of collisions would also be the
same
C. The pressure of the gas on the left would decrease because the number of collisions would increase.
D. The pressure of the gas on the left would double because the number of collisions would also double.
Answer:
D. The pressure of the gas on the left would double because the number of collisions would also double.
Explanation:
According to Boyle’s law, the pressure of a gas is inversely proportional to its volume.
As the number of particles was doubled in the left box, the particles have less space for movement as the volume occupied by gas particles has decreased and it will lead to the collision of gas particles with the walls of the container.
As the volume decreases as gas particles were doubled and so the pressure of the gas on the left would double.
Hence, the correct answer is "D. The pressure of the gas on the left would double because the number of collisions would also double."
Please help anyone??
Answer:
6 sulfur atoms
Explanation:
The subscripts right after each element tell you how many elements are present in the ion. If there are parentheses, the subscript outside of them applies to all the elements in the parentheses. You multiply the subscript of the element by the subscript of the ion (the one outside the parentheses)
2 x 3 = 6 S
if the force of gravity blank the weight of an object will blank
ALL OF THESE ARE FORMS OF MIXTURES EXECPT...
A. ALLOYS
B. NEON
C. COLLOIDS
D. SOLUTIONS
Answer:
B. NEON.
HOPE IT HELPED
why do competitors avoid using their compass overhead power lines
Answer:
Power lines produce a magnetic field
Explanation:
Power lines produce a type of magnet called an Electro-magnet which pulls metal magnetic objects towards it and the compass relies on magnetic feilds in order to point north.
With circulation, the heart provides your body with:
a. oxygen
b. nutrients
C. a way to get rid of waste
d. all of the above
Explanation:
The lungs pump oxygen in and carbon dioxide out, which goes through the blood stream to help with the cell's energy needs.
Nutrients pass through the blood stream as well. The nutrients start with the digestive system (mouth, esophagus, stomach, small intestine) before going into the blood stream. The nutrients are building blocks to help make new cells when old ones die off.
When those cells die off, the body sheds them like dead skin, but internal dead cells are passed off as waste. This waste and other byproducts the body doesn't need passes through the blood stream as well.
In short, the blood stream is basically the highway to help get desired materials (eg: oxygen and nutrients) and get rid of waste (eg: carbon dioxide and other unwanted byproducts or dead cell material)
So that's why the answer includes A, B and C.
Light with 4.5 eV of energy hits a metal surface with a work function of 3.2 eV. Will electrons be emitted ? If so how much energy ?
Answer:
Yes, electrons with energy of 1.3ev will be emitted from the metal surface
Explanation:
From Eisenstein's photoelectric equation;
KE= E - Wo
Where;
KE= kinetic energy of the emitted photoelectron = ??
E= Energy of the photon =4.5 ev
Wo= work function of the metal = 3.2ev
KE= 4.5 ev - 3.2 ev
KE= 1.3 ev
Emma wants to go swimming the first day the pool opens in May, but she is worried it will be too cold since summer only just started. She only likes to swim in the water if the pool is at least 82°F. The thermometer in the pool reads 24°C. Is the pool warm enough for Emma to swim in? Show all work to support your answer.
Answer:
the water is not warm enough for her
Explanation:
Given that
Her preferred temperature = 82°F
Thermometer in water reads = 24°C
Convert the preferred temperature to °C
°C=5/9 (82-32)
°C = 27.8 °C
Hence the water is not warm enough for her
The water is not warm enough for her to swim in.
She loves to swim in water at temperature = 82°F.Thermometer in water reads = 24°C.We have to convert Emma's preferred temperature to °C
°C= 5/9 x (F - 32)
°C=5/9 (82-32)
°C = 27.8
Therefore the temperature is 27.8°C
This means that the temperature of the water is not warm enough for her
to swim in.
Read more about Temperature here https://brainly.com/question/1852859
The heart is a large
________________
that pumps the blood
throughout the body.
How will you know that a
mixture is a homogeneous or
heterogeneous mixture?
CCC Energy and Matter Recall that force = mass x acceleration. Explain why the
acceleration of a model rocket increases over time, even if the force from the
burning of the rocket fuel remains constant.
Answer:
The mechanical device inside just gets the energy of the fuel and not the actual liquid.
Explanation:
The acceleration increases since the mechanical device is getting the energy of the fuel and not the fluid.
Just an idea
The information regarding the acceleration of a model rocket should be explained below;
The following information should be considered:
The mechanical device i.e. inside just gets the energy of the fuel but not the actual liquid.The acceleration increases because the mechanical device is getting the energy of the fuel however not the fluid.Learn more: https://brainly.com/question/1979431?referrer=searchResults
After stirring salt in a container of water, the salt will dissolve. When adding more salt, eventually the salt will not dissolve. Which of the following refers to a substance that can no longer dissolve in a liquid? *
A. boiling point
B. melting point
C. saturation point
D. all of these
Answer: C. Saturation point
Explanation:
What is the mass, in grams, of 7.27 x 10^8 Ne atoms?
I need answers it is almost due!!
Answer:
441
Explanation:
Determine the average atomic mass of the following mixture of isotopes of Potassium:
(93.12%) 38.963 amu
(6.88 %) 40.962 amu
Answer
the first one (im pretty sure)
Explanation:
