HELLLLPPPPPPP
Which of the following is the correct term for the chemical reaction that forms polymers?
A. Displacement
B. Oxidation
C. Polymerization
D. Monomerization
In what way do the atoms in the same row of the Periodic Table increase from left to right?
Answer:
As you move from left to right, the nucleus gains protons. This increases the positive charge of the nucleus and its attractive force on the electrons. At the same time, electrons are added to the atoms as you move from left to right across a period.
Explanation:
What type of ions do nonmetals naturally form?
Answer:
Negative Ions
Explanation:
Nonmetals naturally form Negative Ions by gaining electrons to fill the valence shell
Which of the following causes a physical change in the shape of an object?
A. Using a wire to conduct electricity
B. Heating a piece of iron until it glows
C. Placing a penny in acid to make it shiny
D. Sharpening the tip of a pencil
please helppp
Answer:
B
Explanation:
Heating a piece of iron until it glows.
Heating a piece of iron until it glows causes a physical change in the shape of an object. Therefore, option B is correct.
What is physical change ?The term physical change is define as a type of change where the physical properties of matter change. In physical change, composition and chemical nature of matter does not change.
It involves in change in physical properties. The examples of physical changes are textural change, shape, size, color, volume and density.
Heating a piece of iron until it glows causes a physical change in the shape of an object, because it involves physical property. The changes in which only physical properties of substances are changed, and no new substance is formed
Thus, option B is correct.
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question is
P2O5 a ionic or covalent bond, its covalent right?
Answer:
Covalent
Explanation:
A general clue that a compound is covalent is two nonmetallic elements bonded together. There is the sharing of electrons but no transfer or formation of ions like there is in ionic bonding.
What percent of a human cell is made of macromolecules?
Answer:
About 70 percent. I hope this helps :)
The formula for one molecule of sucrose is shown below.
C12H22011
How many atoms in all are in one molecule of sucrose?
Answer:
45
Explanation:
There are 12 Carbons
There are 22 Hydrogens
There are 11 Oxygens.
I think the answer is either 0 or 45. But the wording is very sloppy. It is not really atoms that are present. There are ions.
Go with 45 but hold your nose when writing your answer.
Which describes how rubbing fur on a rubber rod makes the rod negatively charged. Select one: A. Electrons move from the fur to the rubber rod. B. Electrons move from the rubber rod to the fur. C. Protons move from the rubber rod to the fur.
Answer:
A
Explanation:
Rubbing fur on a rubber rod results in the rod becoming negatively charged as a result of the movement of electrons from the fur to the rubber rod.
The process is called triboelectric charging. When the two substances are rubbed together, their atoms come into close proximity with each other and their electron clouds interact with the fur losing electrons to the rubber due to the fact that the atoms of the rubber have higher affinities for electrons than the atoms of the fur. Hence, the fur becomes positively charged while the rubber becomes negatively charged.
why chemical reactions are important to society?
Which of an atom's electrons are inrolved in chemical reactions?
Answer:
Electrons at the outermost energy level of an atom are called valence electrons. They determine many of the properties of an element. That's because these electrons are involved in chemical reactions with other atoms. Shared electrons bind atoms together to form chemical compounds.
Explanation:
Answer:
electrons farthest from the nucleus of the atom. they are called valence electrons
What is the formula for nitrogen monoxide?
O N203
O NO
O N₂O,
O None of the answers are correct
Which event most likely occurs at point V?
cooling
erosion
heating
melting
Answer: cooling
Explanation:
Answer:
cooling
Explanation:
what is the function of the cell membrane?
Answer:
Its the thin lining around the cell the moniters what gets in and out of the cell.
Explanation:
Scientists changed the genes of a tomato plant in order to produce a protein which is a natural pesticide. Why would this be classified as a positive mutation?
Answer:
The plant would be insect-resistant and improve its chances of success.
Explanation:
how can you find the Frequency if you only have the wavelength? can you solve this example what is the Frequency of the wavelength 4km? can you please show your steps thanks.
Answer:
75000 Hz
Explanation:
f = V / λ (f= frequency, v=velocity of wave, lambda= wavelength)
alternatively, f = c / λ (f= frequency, c= speed of light- 3.00x10^8 m/s, lambda= wavelength)
f= [3.00x10^8 m/s]/[4000 m]
=75000 Hz
The repeating subunits that are responsible for the chance of a crystal are know as
unit cells
heavy nuclei
light electrons
amorphous cells
Which of the following is an extensive property of a sample of aluminum?
Answer:
Entropy,mass and volume.... I think
Mass is the extensive property of a sample of aluminum. Therefore, option (A) is correct.
What is the extensive property of matter?The extensive property can be described as a physical property of matter that changes with a change in the size and shape of the matter. Therefore, the extensive property of any substance varies directly with the mass.
Extensive properties are the value of the property of the system that must be equal to the sum of the values of different parts of the system. These properties depend on the amount of matter contained in the system.
Examples of Extensive properties are temperature, pressure, density, boiling point, etc. The ratio of the two extensive properties is an intensive property such as density.
The mass of a sample of aluminum is an example of extensive property as it depends on the amount of aluminum in the given sample. This property of the sample is proportional to the size of the system.
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Your question is incomplete, most probably the complete question was,
Which of the following is an extensive property of a sample of aluminum?
A) Mass
B) Temperature
C) Pressure
D) Density
what is always true of a week acid??????
A) It only partially dissociates in solution.
B) It does not dissolve in water.
C) It contributes only one proton.
D) It has been diluted with water.
Answer:
I'm pretty sure it's A
Explanation:
Answer:
for the a p e x quiz:
it dissociates completely in solution.
Explanation:
a p e x
what would happen if the
attractive forces between all of the particles
of matter on Earth were equal?
The magnitude of attractive forces between particles that compose matter determine the state of matter. Hence, if all particles of matter on earth have equal attractive forces, only a single state of matter (solid, liquid or gas) will exist on earth.
Matter exists in three states;
SolidLiquidGasIn solids, there exists the greatest magnitude of attractive forces between particles.
There are weaker inter-molecular attractive forces between liquid particles. However, inter molecular attractive forces are almost non-existent in gases.
The reason for the existence of different states of matter on earth is difference in magnitude of inter molecular attractive forces in each state of matter.
If all particles of matter possess equal attractive forces, only one state of matter will be found on earth; either solid, liquid or gas.
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What is Constituent Element?
Answer:
hope it helps...
Explanation:
a constituent element, material, etc.; component. a person who authorizes another to act in his or her behalf, as a voter in a district represented by an elected official. Grammar. an element considered as part of a construction. Compare immediate constituent, ultimate constituent.
If this helped please comment...
Non examples of chemical change
List some please
Answer:
Crushing a can.
Melting an ice cube.
Boiling water.
Mixing sand and water.
Breaking a glass.
Dissolving sugar and water.
Shredding paper.
Chopping wood.
Some non-examples of the chemical reaction should be boiling water, glass breaking out, etc.
Chemical reaction
It is a process where one or more substances that we know as reactants should be transformed into one or more distinct substances that we know as products. Here the substances should be treated as the elements of chemicals or the compounds.Chemical reactions are an integral part of technology, culture, and indeed of life itself. Burning fuels, smelting iron, making glass and pottery, brewing beer, and making wine and cheese are among many examples of activities incorporating chemical reactions that have been known and used for thousands of years. Chemical reactions abound in the geology of Earth, in the atmosphere and oceans, and in a vast array of complicated processes that occur in all living systems.Therefore, Some non-examples of the chemical reaction should be boiling water, glass breaking out, etc.
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What does the chemical formula show?
a) The number of elements in each molecule
b) The number of atoms in each molecule
c) How heavy the molecule is.
d) The elements in the molecule and the number of atoms of each one .
Answer:
A
Explanation:
You can eliminate C because you need to consult a periodic table to determine the mass (not the weight).
There are other answers you could use. The wording is awfully sloppy. D is an example of that. The elements part is true, the atoms part is not really true in all cases. For example NaCl is table salt and both the elements are ions, not atoms. Na is plus ion and Cl is minus one. B is wrong for the same reason.
I think in the end I would choose A. I think this is a very sly question. It is not really testing chemistry. It is testing how well you know your definitions.
Calculate the amount of heat needed to evaporate 235.0 grams of water from 25.0°C to 100.0°C.
Milk of Magnesia is a type of medication people can take to help with heartburn and indigestion cause by stomach acid.
If the pH of this solution is 10.5, which phrase would correctly describe Milk of Magnesia?
This substance would turn blue litmus paper to red.
This substance will likely taste sour.
This substance is acidic.
This substance is basic.
Answer:
This substance is basic.
Explanation:
The milk of Magnesia, a type of medication which can help people with heartburn and with a pH of 10.5 is a basic solution.
Bases are certain metallic oxides, metallic hydroxides and aqueous ammonia. They have the following properties: On the pH scale, they have a value between 7-14They turn red litmus paper blue. Bases are electrolytes. They have a bitter taste. They are soapy or slippery to feel.Which of the following is the best way to model the process of weathering?
Using a fan on a pile of sand causing the sand to move into a pile in a new location.
Using a ramp to dump sand at the bottom causing the sand to pile up.
Using a watering can sprinkle water onto sand causing the sand to move to a new location.
Filling a glass bottle with water and allowing it to freeze causing the bottle to break.
The best model of weathering is using a fan on a pile of sand causing the sand to move into a pile in a new location.
Weathering refers to the gradual breakdown of a rock due to the agents of denudation. The agents of denudation could be physical, chemical or biological.
The breakdown of rocks leads to the formation of soil. The closest model to the weathering of rock is using a fan on a pile of sand causing the sand to move into a pile in a new location.
The pile represents the rock which is being broken down as the fan blows the pile and it settles on a new location.
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All atoms, isotopes, and ions of Magnesium have the same...
atomic number
mass number
all of the above
charge
Answer:
option A: Atomic number
Explanation:
The atoms, isotopes and ions of magnesium doesn't change the atomic number of the magnesium.
For example, Isotopes are atoms that have the same number of protons but at the same time have different numbers of neutrons. This means that atomic number remains the same while mass number differs. Now, an ion is defined as an atom or molecule that has either a positive or negative charge.
So only option A is correct: Atomic number
what particle joins or bonds atoms to form a compound or molecule
Keep a chart of your observations. You may even want to draw what you see. What do you observe? What does this tell you about the density of the liquids and the objects you put into them?
Answer: The density of a liquid determines whether it will float on or sink in another liquid. A liquid will float if it is less dense than the liquid it is placed in. A liquid will sink if it is more dense than the liquid it is placed in.
Explanation: I hope that helped!!
FISICOQUIMICA HIDROSTATICA
(?)Li2O + (?)H2O → (?)LiOH
what goes inside the question marks?
Answer:
(1)Li2O + (1)H2O → (2)LiOH
Hope this helps!