Answer:
How do ion charges differ for the fourth main group column and the transition metals? Do not have common charges. Transition metals tend to form positive ions, but the number of electrons that are lost varies. Describe how atoms with a large difference in electronegativity form ionic bonds.
Explanation: ?
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.
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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Need help on those two please
Answer:
B. Liquid
B. Gas
Explanation:
I majored in Chemistry
10. There are two bears that both have the same proteins for ear shape in their cells. The bears have
different parents. What can you say about the bears' ear shape?
Answer:
They will have the same ear shape since their proteins connect in the same ways to determine ear shape.
Explanation:
I majored in Chemistry
Answer:
They will have the same ear shape since their proteins connect in the same ways to determine ear shape.
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]
If light and sound Travel from point a to point b And start at the same time, which is gonna reach point b first
The Aufbau Principle describes that
O electrons with the same spin cannot occupy the same orbital.
electrons will occupy single orbitals within and energy level before doubling up
electrons fill lower energy levels first before occupying higher energy levels.
O electrons in the same level have the same amount of energy
Answer:
electrons fill lower energy levels first before occupying higher energy levels.
Explanation:
The Aufbau's principle describes that electrons fill lower energy levels first before occupying higher energy levels.
In writing the electronic configuration of atoms, the Aufbau's principle is one of the most important principles to consider.
It states that "sublevels with with lower energies are filled up before those with higher energies".
Sublevels do not fill up in numerical order.
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!
Have a Great Day!
30 PTS!! chemistry - a new element chemistry TCT
Answer:
so is this a project or a quiz
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%
What is temperature
Answer:
I just love the killua pfp
I think b
Answer:
c
Explanation:
because it forces and help it
How many grams are in 25.0 moles of carbon tetrachloride (CCI)?
Answer:
3.84 kg
Explanation:
CCl4 molar mass: 153.82 g/mol
n = mass / molar mass
25 moles = mass / 153.82 g/mol
mass = 25 x 153.82
mass = 3845 g or 3,84 kg
how many molecules are in 0.89 of silver
Answer:
5.36 × 10²³ molecules
Explanation:
Given data:
Number of moles of silver = 0.89 mol
Number of molecules = ?
Solution:
Avogadro number:
The number 6.022 × 10²³ is called Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
Number of molecules of silver:
1 mole contain 6.022 × 10²³ molecules
0.89 mol × 6.022 × 10²³ molecules /1 mol
5.36 × 10²³ molecules
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 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.
An atom is found in group 17 and contains 10 neutrons. How many valence
electrons does it have? *
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
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.
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:
20 POINTS TO WHO ANSWERS THIS
How can a chemical reaction be sped up?
Select from the drop-down menu to correctly complete the statement.
Increase the to allow the reaction to happen with more energy.
A) Catalyst
B) Concentration
C) Surface Area
D) Temperature
answer: D
Here is a list of the most common ways to speed up a chemical reaction
Increase the temperature (reactions that absorb energy)
Decrease the temperature (Reactions that release energy)
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
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:
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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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
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.
Which of the following is NOT a true statement?
А The sun's gravity keeps the Earth spinning around it.
B The moon's gravity pulls on the Earth's ocean.
C Earth's gravity keeps the moon close to it.
D Earth's gravity keeps all the planets spinning around the sun.
Answer:
c is not a true statement
Answer: it’s
Earth gravity keeps all the planets spinning around the sun.
Explanation:
Got it right
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.
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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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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Which job title describes a person with a career in green energy?
Answer:
Natural resource professional
Explanation:
The job title that describes a person with a career in green energy is a hydroelectric technician. The correct option is c.
What is green energy?Green energy is renewable energy and these energies are produced by renewable resources. Renewable resources are the resources that will not be reduced, and these natural resources are present, and these energies can reproduce again by these resources.
The hydroelectric technician is the person who checks the technical problems of a hydroelectric power plant. Hydroelectricity is produced by water.
This is a renewable resource, and it does not produce any kind of pollution, So a hydroelectric technician will be a job title that describes a person with a career in green energy.
Therefore, the correct option is c., hydroelectric technician.
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The question is incomplete. Your most probably complete question is given below:
Elevator installer
sewing machine operator
hydroelectric technician
animal trainer