The ocean floor being featureless was the assumption was proved wrong after the invention of sonar.
What is Sonar?This employs the use of sound propagation to measure the distance or presence of objects under the water.
This helped to show that the ocean floor had features such as canyons, mountains etc hence option B was chosen.
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how are the foram fossils from the two time periods different?
Answer:
here are several resons that fossil foraminifera are especially valuable for determining the relative ages of marine rock layers. They have been around since the Cambrian, over 500 million years ago. They show fairly continuous evolutionary development, so different species are found at different times.
30 PTS!! chemistry - a new element chemistry TCT
Answer:
so is this a project or a quiz
Which statement best describes the weather shown by the blue triangles going one way and the red semicircles going the other way on a line on a weather map?
A cold front can cause heavy rain, thunder, and lightning.
A stationary front may produce rainy or snowy weather for several days.
An occluded front can cause light to heavy precipitation that may last several days.
A warm front brings drizzly weather.
Answer: The statesmen that best describes the weather shown by the blue triangles going one way and the red semi-circles going the other way on a line in the weather map is “warm front brings drizzly weather.
Answer:
A stationary front may produce rainy or snowy weather for several days.
Explanation:
I need help with stoichiometry! if you could help please respond to this question and i will post the question. reason being, no one has answered the questions i have posted, and I need help quickly!
Answer:
will go do that.
Explanation:
In order to prove that the Law of Conservation Mass is obeyed, what are the coefficients
needed to balance the following reaction:
C3Hg +
02
1
CO2 +
H2O
Answer: [tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation for combustion of propane will be :
[tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]
At the heart of the stars, nuclear fusion merges _____ together in the nucleus of atoms to create new elements?
Answer:
lighter atoms especially hydrogen
Explanation:
At the heart of the stars, nuclear fusion merges lighter atoms especially hydrogen together in the nucleus of atoms to create new elements.
During nuclear fusion small atomic nuclei combines to form larger ones with the release of a large amount of energy.
The energy released provides the needed temperature for another set of hydrogen atoms to fuse. This process is in turn yields another set of helium atom which releases a lot of energy.
A chain reaction progresses which leads to the formation of new elements.
somebody please help asap
Need help on those two please
Answer:
B. Liquid
B. Gas
Explanation:
I majored in Chemistry
16.
As the elements in Group 17 on the Periodic Table
are considered from top to bottom, what happens
to the atomic radius and the metallic character of
each successive element?
A. The atomic radius and the metallic character
Aboth increase.
B. The atomic radius increases and the metallic
character decreases.
C. The atomic radius decreases and the metallic
character increases.
D. The atomic radius and the metallic character
both decrease.
Answer:
Explanation:
When going from top to bottom in any group of the periodic table, the atomic radius always tends to increase
Which type of bond will most likely be found in HBr given that the electronegativity of hydrogen is 2.20 and the electronegativity of bromine is 2.96?
an ionic bond
a metallic bond
a polar covalent bond
a nonpolar covalent bond
Answer:
C. A polar covalent bond
The most likely bond found in HBr is a polar covalent bond.
What kinds of bonds exist?Ionic bond : It is formed between metals and nonmetals and the difference in their electronegativities is higher than 1.7.Metallic bond : It is formed between metals with and the difference in their electronegativities is very small.Polar covalent bond : It is formed between nonmetals and the difference in their electronegativities is between 0.4 and 1.7.Nonpolar covalent bond: It is formed between nonmetals and the difference in their electronegativities is lower than 0.4.In HBr, both H and Br are nonmetals so the bond must be covalent. The difference in their electronegativities is:
ΔE = |EN(H)-EN(Br)| = |2.20-2.96| = 0.76
The most likely bond found in HBr is a polar covalent bond.
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A blacksmith partners with a team of chemistry and physics graduate students to
develop an anchor for boats that is able to be produced with minimal waste. Which of
the following do scientists need to take into consideration when designing this new
anchor to ensure that it is effective?
A. The color of the metal ions when dissolved in water.
B. The color of the metal
C. How easily the anchor changes temperature.
D. The density of the metal
Answer:
b
Explanation:
ur welcome
Situation No. 1. Joey is about to start working on his experiment about plant
cell using a compound microscope. He noticed that one of the objective lens is
missing and the course adjustment knob is not working. The eyepiece lens is
also broken.
Complete question: Learning Task 4: Read the following situations. Identify the part and the
function of the microscope mentioned in each situation. Write your answers in
your answer sheet.
Situation No. 1. Joey is about to start working on his experiment about plant
cell using a compound microscope. He noticed that one of the objective lens is
missing and the course adjustment knob is not working. The eyepiece lens is
also broken.
Answer: The parts of the compound microscope mentioned in this situation includes:
Objective lens, course adjustment knob and eyepiece lens.
Explanation: A compound microscope is a magnifying instrument which can be used to carry out various experiments in a laboratory. According to the working principle of a microscope, the magnified image of the object (plant cell) is first produced by a lens close to the object called the objective lens. This collects light from the object and forms the primary image. A second lens near the eye called the eyepiece lens enlarges the primary image,converting it into one that can enter the pupil of the eye. The different parts and the functions of the compound microscope observed by Joey includes:
--> Objective lens: The objective lens gathers light from the specimen, which is focused to produce the real image that is seen on the eyepiece lens. It's functions includes formation of primary image and determination of the quality of the image produced.
--> Course adjustment knob: This is the part of microscope that is used in focusing the specimen that is under observation through changing the distance between the lens and the specimen. Therefore it functions to bring the specimen into general focus.
--> Eyepiece lens: This is the lens that is closest to the eye of the observer. It functions to magnify the image formed by the objective lens as it's being placed near the focal length of the objective lens.
The nucleus of one atom contains 12 protons and 12 neutrons, while the nucleus of another atom contains 12 protons and 16 neutrons. What are the atoms?
A) chromium atoms
B) two different elements
C) two isotopes of an element
D) negatively charged
Answer:
Option C (two isotopes of an element)
Explanation:
An isotope is two or more forms of the same element that contain equal numbers of protons (as well as electrons) but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties. For example :-
Isotopes of carbon ⇒
¹²C₆ (Carbon-12) has 6 electrons , 6 protons & 6 neutrons.¹⁴C₆ (Carbon-14) has 6 electrons , 6 protons & 8 neutrons.In the question , both the atoms have same number of protons , but their number of neutrons isn't same. Hence , they are the isotopes of an element.
Calculate the percent composition of Hydrogen in C6H1206. Periodic table question
Answer:
6.7%
Explanation:
The formula of the compound is given as:
C₆ H₁₂ O₆
The problem here is to find the percent composition of hydrogen.
First;
Find the molar mass of C₆ H₁₂ O₆ = 6(12) + 12(1) + 6(16) = 180g/mol
Secondly;
Percentage composition of H = [tex]\frac{molar mass of H}{Molar mass of compound}[/tex] x 100
Percentage composition of H = [tex]\frac{12(1)}{180}[/tex] x 100 = 6.7%
The 2 forces acting on the anvil are ___________ and the pull of the _________
Answer: The 2 forces acting on the anvil are weight and the pull of the Gravity
Explanation:
If light and sound Travel from point a to point b And start at the same time, which is gonna reach point b first
What is temperature
Answer:
I just love the killua pfp
I think b
Answer:
c
Explanation:
because it forces and help it
The sun’s core is made of solid rock. True or false
Answer:
False
Explanation:
Heres what its made of:
The core is made of hot, dense plasma (ions and electrons), at a pressure estimated at 265 billion bar (3.84 trillion psi or 26.5 petapascals (PPa)) at the center. Due to fusion, the composition of the solar plasma drops from 68–70% hydrogen by mass at the outer core, to 34% hydrogen at the core/Sun center.
Fish in a frozen lake can survive throughout the winter months due
partially to the fact that lakes don't freeze solid. Fresh water has a density
of 1.00 g/cm3. A piece of ice has a mass of 57g and a volume of 62 cm3.
Give the density of the piece of ice (use the density formula d = m/V) and
explain what will happen to it in the lake.
The ice will float on the lake
Further explanationGiven
Mass of ice 57 g and a volume of 62 cm³
Required
Density
Solution
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
Input the value :
ρ = 57 g : 62 cm³
ρ = 0.919 g/cm³
Because the density of ice is less than water, it will float on the lake
.
1 Condensation
2. Groundwater
3. Infiltration
4. Evaporation
5. Transpiration
6. Precipitation
7. Runoff
8 Solar Radiation
Answer:
Explanation:
A ) Solar Radiation
B ) Evaporation
C ) Transpiration
D ) Condensation
E ) Precipitation
F ) Run Off
G ) Infiltration
H ) Groundwater .
A mass of a gas occupies 840cm cube at 750mm pressure, what volume would it occupy at 780mm pressure
The final volume : 807.69 cm³
Further explanationGiven
Initial volume : 840 cm³
Initial pressure : 750 mmHg
Final pressure : 780 mmHg
Required
The final volume
Solution
Boyle's Law
At a fixed temperature, the gas volume is inversely proportional to the pressure applied
[tex]\tt p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
Input the value :
V₂=(P₁V₁)/P₂
V₂=(750 x 840)/780
V₂=807.69 cm³
Which one of the following is a chemical property?
A. A wood block is less dense than water
B. Gold bar is shiny
C. Bubbles form when baking soda and vinegar are mixed.
D. Water turns from liquid to gas at 1000C.
pls help thx
The forming of bubbles when baking soda and vinegar are mixed is a result of chemical property.
Chemical PropertiesChemical properties of materials are properties that are due to the chemical composition of the materials.
The formation of bubbles when baking soda is mixed with vinegar is a result of the evolution of carbon dioxide gas.
Baking soda reacts with vinegar to produce carbon dioxide and other products according to the chemical equation below:
NaHCO3 + CH3COOH → CO2 + H2O + CH3COONa
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Scientists say that photosynthesis and cellular respiration create a cycle that is essential to almost all life on Earth. Use your knowledge of these processes to explain how an oil spill that kills a large percentage of the photosynthetic organisms living in the ocean could affect humans.
Answer:
Explanation:
An oil spill is a catastrophic event in the environment. It can negatively affect both plants and wildlife while causing human suffering and economic losses. An oil spill needn't be on the scale of the Exxon Valdez or Deepwater Horizon disasters. The U.S. Environmental Protection Agency (EPA) estimates that 200 million gallons of used oil are disposed of improperly each year.
Spilled oil floats on the surface of the water, blocking the sunlight, from reaching the plants within the body of water. Spilled oil may also directly coat the leaves of plants -- where most of the work of photosynthesis occurs -- reducing or blocking out sunlight. Without sunlight, plants lack the energy needed to undergo photosynthesis.
An oil spill can impact photosynthesis by reducing water quality. Not only does the presence of oil directly poison the water, but the spill can kill sea life, birdlife and other wildlife that uses an aquatic habitat. A large die-off can increase bacteria levels and lower the pH of a body of water. The reduction in water quality can stress plants, essentially halting photosynthesis.
If an object is moving right at 10 N and a force is applied from the left at 8N, what is the net force on the object?
Answer:
If an object is moving at a constant speed in a constant rightward direction, then the acceleration is zero and the net force must be zero.
According to Aristotle, a force is anything that causes an item to move "unnaturally." One of the first scientists to explore force and gravity was Sir Isaac Newton. A push or a pull is all that constitutes a force. It might be compared to pushing or pulling on an object.
What is force?An object's push or pull is seen as exerting a force. The interaction of the objects produces push and pull. You can also use words like stretch and squeeze to describe force.The definition of force in physics is. The push or pull on a mass-containing item changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
The net force is:
Fnet = Fr - Fl = 10 - 8 = 2N
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How many particles are in 34g of Gold?
Answer:
1039.482
Explanation:
Learning about the parts of an atom is important because
It can help us create a better model of an atom.
It can help us create new elements.
It can help us study how cells in the body functions.
It can help us explain the universe.
Answer:
"it can help us explain the universe" or "it can help us study how cells in the body function"
Explanation:
you choose which one you want but their still both technicly right
A 5.0 L chamber contains equal pressures of H₂ and N₂ at 25 °C. Which of these gases contains a larger number of molecules?
Answer:
C) Both have equal numbers of moles.
Explanation:
The number of moles would be the same under the same pressure, volume and temperature.
"If A 5.0 L chamber contains equal pressures of H₂ and N₂ at 25 °C then both gases would have equal number of molecules according to Ideal Gas Law."
Both contain equal number of molecules.
According to Avogadro's Law, 1 mole of every substance occupies 22.4 L at STP.
Thus, equal volume of all gases contain same number of molecules at same temperature and pressure.
[tex]PV=nRT[/tex]
where, P = pressure
V = volume
n = moles
R = gas constant, and
T = Temperature
As volume , pressure and temperature are equal for both [tex]H_2[/tex] and [tex]N_2[/tex] gases, therefore both gases contains equal moles and hence equal number of molecules.
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Imagine that you skipped from one end of a room to the other end of the room. Explain how gravity affected your motion.
Answer:
when you skipped you jumped up but gravity pulls you to the ground when you jump
Explanation:
On skipping in a room, gravity affects the motion by pulling back to the ground.
Gravity has been defined as the force acting by the earth in the downward direction. It has been the strongest force and has been responsible for life on earth.
On skipping in a room from one end to another, there has been a force applied in the direction against gravity. The application of force has resulted in an upward motion. The gravitational force has been acting in the downward motion, and result in pulling back to the ground.
Thus, on skipping in a room, gravity influences the motion by pulling back to the ground.
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how is carbon dioxide manufacture in the industry
Explanation:
While CO2 can be distilled from the air, that method is expensive and inefficient. Therefore, it is usually captured from other sources where it is a waste material. This could be anything from brewing beer to burning fossil fuels. However, the most efficient way of producing carbon dioxide is from ammonia.
A student is building an electrical circuit. Which material should she choose for wires, and why.
Look at the screen shot
D. A metal such as copper, because its atom have very mobile electrons - A-p-e-x verified!
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