Which occurs whenever valence electrons are shared or transferred between atoms
A. A Decrease in change
B. Radioactive decay
C. An increase in change
D. A chemical reaction
Final answer:
Correct answer - D. Whenever valence electrons are transferred between atoms, a chemical reaction occurs, leading to the formation of ionic or covalent bonds and the creation of ions.
Explanation:
The occurrence described in the question, where valence electrons are shared or transferred between atoms, corresponds to option D, A chemical reaction. This is a central concept in chemistry where elements interact to form compounds. When an atom gains or loses electrons, it becomes an ion: a cation if it loses electrons (and therefore has a positive charge), or an anion if it gains electrons (resulting in a negative charge). The transfer of electrons leads to the formation of ionic bonds, as seen in the production of table salt from sodium and chloride. When electrons are shared between atoms, this typically leads to the creation of covalent bonds.
Question 4(Multiple Choice Worth 4 points)
(01.01 MC)
Which question cannot be answered by science?
A) Why do rainbows appear after rain storms?
B) Which plants grow in the desert?
C) Why should endangered animals be protected?
D) What is the hardest element on Earth?
Answer: C) Why should endangered animals be protected?
Explanation:
A science is a discipline which can answer questions related to the cause of natural processes or events occurring in the natural world. The questions related to science can be answered by experimental procedures.
C cannot be answered by science as it is a question of moral question related to social ethics. The endangered animals if abolished will negatively reduce the biodiversity of the organisms living on earth.
How many O2 molecules can be made with the oxygen from 492 g of sodium phosphate?
Final answer:
Without a chemical reaction formula, it's not possible to calculate the number of O2 molecules that can be made from 492 grams of sodium phosphate.
Explanation:
The number of O2 molecules made from 492 grams of sodium phosphate requires a stoichiometric calculation based on the chemical reaction involved. However, since no reaction is given, we cannot accurately determine the amount of O2 that could be produced from sodium phosphate. We would need the balanced chemical equation for the decomposition or reaction involving sodium phosphate to calculate the number of O2 molecules formed.
Perspective influences how a person looks at a piece of art and its qualities.
a.
always true
c.
always false
b.
sometimes true
d.
Perspective is not relevant in the interpretation of art.
List the two main types of energy.
Answer: kinetic and potential energy
Explanation:
kinetic is energy of motion
energy that can move
potential is stored energy
energy that cant move
100% correct
How does alternate freezing and thawing of water cause weathering to occur? Freezing chemically alters the rock surfaces Water expands when it freezes and cracks rocks open Thawing causes rock particles to move from place to place
Answer: I think water expands when it freezes and cracks rocks open
Explanation:
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Which pair of kingdoms include organisms which are all multicellular?
A. Animalia and Fungi
B. Animalia and Plantae
C. Protista and Fungi
D. Protista and Plantae
what will happen if you add more solute to a saturated solution
what are two ways non metalic minerals can be used?
A. Wiring and Gems
B. Conductors and for industrial purposes
C. Gems and as conductor
D. Industrial processes and gems
Convert 2.0 mm3 to the unit m3.
a. 2.0 x 10-6 m3
b.2.0 x 10-3 m3
c.2.0 x 10-9 m3
d.2.0 x 103 m3
To convert from mm3 to m3, use the conversion factor of 1 m3 = 10^9 mm3. You then divide the given quantity in mm3 by this conversion factor to find its equivalent in m3, finding that 2.0 mm3 is equal to 2.0 x 10^-9 m3.
Explanation:In order to convert mm3 to m3, the relationship between the units is crucial. In this case, there are 1,000,000,000 (10^9) cubic millimeters in one cubic meter since 1 meter equals 1000 millimeters, you cube this to get the conversion in volume. Thus, the conversion factor would be 1 m3 = 10^9 mm3. Therefore, to convert 2.0 mm3 into m3, you divide the cubic millimeter by this conversion factor.
Formally, you perform the operation as follows:
Identify the conversion factor: 1 m3 = 10^9 mm3Divide the quantity in mm3 by the conversion factor. Resulting in: 2.0 mm3 / 10^9 = 2.0 x 10^-9 m3So, the correct answer is 2.0 x 10^-9 m3
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All living things are made of organic compounds which contain the element
A) carbon. B) hydrogen. C) oxygen.
Both white phosphorus and red phosphorus are made up only of phosphorus atoms.Does this mean they are both pure substances? Could they be compounds?
Energy from the Sun is called
PLEASE ANSWER ASAP!!!!! Object A has a mass of 12 g and a volume of 8 cm3. Object B has a mass of 20 g and a volume of 8 cm3. Which object has a greater density and by how much? A: Object A, by 1 gram per cubic centimeter B: Object A, by 8 grams per cubic centimeter C: Object B, by 1 gram per cubic centimeter D. Object B, by 8 grams per cubic centimeter
What mostly determines the chemical properties of the atom of an element
Answer: the electrons i.e their valence electron
Explanation: valence electron is the number of electron in the outermost shell of an atom. Infact it is the combining power of an element. The valence electron gives us a better understanding of how an element will react with other elements. This is the reason why elements with the same number of valence electron(s) are grouped together telling us that they exhibit similar chemical properties
list three properties if the elements that are useful in sorting the elements.
Three properties of elements that can be used in sorting elements are; density, refractive index and melting/boiling point.
The properties that can be used to sort elements are intensive properties. These are properties that do not depend on the amount of substance present.
They are unique to each element and can serve as a kind of finger print to identify an element.
Three of such properties are;density, refractive index and melting/boiling point.
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a 20 mL pipet sample of alcohol is found to weigh 15.71 g. What would be the mass of 35.25 mL of the same alcohol? What volume would 125.4 g of this alcohol occupy
Final answer:
To calculate the mass and volume of alcohol based on its density, we use basic principles of chemistry. The mass of 35.25 mL of alcohol is found to be approximately 27.69 g, and 125.4 g of the same alcohol would occupy approximately 159.65 mL.
Explanation:
The question involves calculating the mass of a certain volume of alcohol given its density and vice versa. First, we find the density of the alcohol using the initial 20 mL sample which weighs 15.71 g. The density (ρ) is mass (m) divided by volume (V), so ρ = 15.71 g / 20 mL = 0.7855 g/mL. Using this density, we can find the mass of 35.25 mL of the same alcohol which would be ρ * V = 0.7855 g/mL * 35.25 mL = 27.687375 g. To find the volume 125.4 g of this alcohol would occupy, we use V = m / ρ = 125.4 g / 0.7855 g/mL = 159.65 mL.
Reactions rates for reactions occurring in solution can be increased by increasing the concentration of the solution. With gases you can do something similar, which is to -
(science Q.1)
please help
PLEASE ANSWER ASAP!
A golf ball is at rest on the grass. What must happen to cause the ball to move?
A balanced net force must be applied.
An unbalanced net force must be applied.
The net force must be zero.
The net force must be greater than the applied force.
An unbalanced net force must be applied.
Which process represent one chemical change and one physical change
what is the number of valence electrons in sodium?
In which situation will the reaction rate increase
Answer:
A) when a catalyst is added
Explanation:
The missing options are:
A) when a catalyst is added
B) when the temperature drops
C) when the pressure is lowered
D) when the molecules are large and bulky
A catalyst increases the rate of a chemical reaction without undergoing a permanent chemical change. They provide an alternative pathway to the reaction which has a lower activation energy than the non-catalyzed mechanism, this increase the reaction rate.
What is the mass number of an isotope of this atom that has 2 neutrons?
Xanax is used to treat anxiety and panic disorders. The dosage strengthh is for each tablet is 0.5 mg. If 1000 micrograms=1 milligram, then how many micrograms arr there in each tablet?
Which one of the following electron transitions does not correspond to an absorbtion of a quanta of light?
1. n = 4 to n = 6
2. n = 7 to n = 5
3. n = 2 to n = 5
4. n = 2 to n = 6
5. None of the Above
Calculate the vapor pressure lowering on an aqueous solution of glycerin that contains 180g of glycerin and 1000g of water at 25c. The vapor pressure of water at this temperature is 23.8torr.
at approximately what latitude do new york massachusetts and connecticut meet
Answer:
About 42° North latitude
Explanation:
Latitudes are defined as the lines that oriented in the east-west direction and they are parallel to the equator.
The 3 cities of the United States namely Massachusetts, New York, and Connecticut are on its eastern side The city of Connecticut, New York, and Massachusetts are situated at about (41.60° N and 73.09° W), (40.71° N and 74.01° W) and (42.41° N and 71.33° W) respectively.
These 3 cities are located adjacent to one another and they share a common point at a longitude of about 42° in the Northern hemisphere.
Thus, the above cities meet at about 42° N latitude.
Which of the following methods can be used to separate salt and iron? Distillation Evaporation Filtration Magnetism
From a mixture of salt and iron, iron can be easily separated using a magnet if they are present as solid fillings. Thus option D is correct.
What is magnetism?Magnetism is the ability of a magnet to produce its own magnetic field and attracts magnetically susceptible objects into it. Iron is can acts as a magnet and it easily attracted by a magnet.
There are different methods for separating individual components from a mixture of them. The separation method is selected based on the physical properties of these substances.
From a mixture of salt and iron, iron can be easily separated using a magnet and all the iron fillings can be collected on to a magnet. Remaining salt can then be purified by dissolving in water and then evaporates off. Hence, option D is correct.
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Which of the following is true about two neutral atoms of the element zinc?
They will always have different masses. Electrons are missing in both the atoms. Both have an equal number of protons. They have different properties.
Final answer:
Neutral zinc atoms will always have the same number of protons, designated by the atomic number (Z) which is 30. While the number of neutrons can differ, creating various isotopes with different masses, the chemical properties of these isotopes are the same. Thus, the factual statement is that both atoms have an equal number of protons.
Explanation:
The question you've asked pertains to the nature of zinc atoms. Neutral atoms of zinc, like all other elements, will have the same number of protons, which is determined by the element's atomic number (Z). For zinc, the atomic number is 30, meaning that each zinc atom has 30 protons.
One of the key points to understand is that the number of neutrons can differ in atoms of the same element, leading to different isotopes of that element. This means that while the number of protons (and electrons in a neutral atom) remains constant, the number of neutrons can vary, affecting the mass number (A) of the isotopes. However, this does not change the chemical behavior of the isotopes since they still have the same number of protons.
Given these fundamental principles, let's review your statements about two neutral atoms of zinc:
They will not always have different masses since two neutral atoms of zinc can be the same isotope.Electrons are not missing in both the atoms if they are neutral; they will have the same number of protons and electrons.Both have an equal number of protons since this defines the element zinc.They do not have different properties simply because they are isotopes; isotopes of an element share similar chemical properties.Therefore, the correct statement regarding two neutral atoms of zinc is that both have an equal number of protons.