In water, naoh almost completely separates into na+ and oh- ions. thus, naoh is _____.
Eyewash stations should be installed within 25 feet of hazard locations. True or False
Calculate the number of chlorine atoms that are present in 66.05 g of dichloromethane, ch2cl2. when you have the number, take its log (base 10) and enter it with three decimal places and without units.
The base-10 logarithm of the number of chlorine atoms is 23.971.
Calculate the number of chlorine atoms that are present in 66.05 g of dichloromethane, CH₂Cl₂. When you have the number, take its log (base 10) and enter it with three decimal places and without units.
Step-by-Step Explanation:
First, determine the molar mass of CH₂Cl₂:
Carbon (C): 12.01 g/mol
Hydrogen (H): 1.01 g/mol (each, so 2.02 g/mol for H₂)
Chlorine (Cl): 35.45 g/mol (each, so 70.90 g/mol for Cl₂)
Total molar mass of CH₂Cl₂ = 12.01 g/mol + 2.02 g/mol + 70.90 g/mol = 84.93 g/mol
Calculate the moles of CH₂Cl₂ in 66.05 g:
66.05 g / 84.93 g/mol = 0.7774 mol CH₂Cl₂
Since each molecule of CH₂Cl₂ contains 2 chlorine atoms, calculate the moles of chlorine atoms:
0.7774 mol CH₂Cl₂ x 2 = 1.5548 mol Cl atoms
Convert moles of chlorine atoms to the number of atoms using Avogadro's number (6.022 x 10²³ atoms/mol):
1.5548 mol x 6.022 x 10²³ atoms/mol = 9.36 x 10²³ chlorine atoms
Take the logarithm base 10 of the result:
log10(9.36 x 10²³ )= 23.971
Therefore, the logarithm (base 10) of the number of chlorine atoms in 66.05 g of dichloromethane, CH₂Cl₂, is 23.971.
which of the following has the smallest atomic radius: Mg2+, Mg, Ca2+, or Ca?
Answer:
Mg2+
Explanation:
What is cellular respiration?
A. Converting sunlight to glucose to provide energy for plants
B. Building glucose from smaller hydrocarbons
C. Exchanging O2 for CO2 in the blood within the lungs
D. Using glucose to provide energy for the body
Answer:
It's D.
Explanation:
Trust me.
Chemical reactions with metals may create some interesting results such as a precipitate. What is a precipitate?
Question 3 options:
A. a gas that forms when two liquids are mixed
B. a solid that forms when two liquids are mixed
C. a liquid that forms when two solids are mixed
D. a solid that forms when two gasses are mixed
By what two characteristics are all the elements of the periodic table placed in a particular row and column
Which bond or interaction would be most difficult to disrupt when compounds are placed into water?
An atom has 40 electrons and 46 neutrons. how many protons does it have?
When atoms lose or gain electrons in chemical reactions they form?
When atoms loose or gain electrons in chemical reactions they form ions on loosing electrons they form cations and on gaining electrons they form anions.
What are ions?
An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.
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As magma cools all of the mineral grains form at the same temperature is this true or false
What is the formula for the binary compound of aluminum and nitrogen?
What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals?
A. basaltic
B. granitic
C. andesitic
D. ultramafic
Answer:
The correct answer is option C, that is, andesitic.
Explanation:
Andesite is the term used for a fine-grained extrusive rocks family, which are generally light to dark gray in appearance. They generally weather to different shades of brown. Andesite mostly comprises plagioclase feldspar minerals and may also comprise pyroxene, biotite, or amphibole as the dark silicate minerals. It generally does not comprise olivine or quartz.
Describe 2 characteristics all metals should display?
Do you expect to find an atom with 26 protons and mass number of 52 in nature
In a redox reaction, why does an element’s oxidation number increase?
A.) An element’s oxidation number increases because it gained electrons.
B.) An element’s oxidation number increases because it lost electrons.
C.) An element’s oxidation number increases because it was heated.
D.) An element’s oxidation number increases because it was reduced.
Answer: B) An element’s oxidation number increases because it lost electrons.
Explanation:
A redox reaction is a chemical reaction in which one or more electrons are transferred between the reactants, causing a change in their oxidation states.
The oxidation state or oxidation number is defined as the sum of positive and negative charges of an atom, which indirectly indicates the number of electrons that the atom has accepted or yielded.
By accepting electrons, the oxidation state of an atom decreases, becoming more negative, and therefore, it is reduced. On the other hand, an element that yields electrons increases its oxidation number and oxidizes.
In this way, an element’s oxidation number increase because it lost electrons, becoming a more positive ion.
What part of the periodic table tells you the number of protons found in the nucleus of the atom of that element?
Final answer:
The atomic number on the periodic table indicates the number of protons in the nucleus of an atom of that element, defining its identity. This number is usually found at the top of the element's square on the table, allowing for easy identification and distinction between elements.
Explanation:
The atomic number on the periodic table tells you the number of protons found in the nucleus of the atom of that element. Each element on the periodic table has a unique atomic number, which is usually displayed at the top of the element's square.
This number is crucial because it defines the identity of the element; for instance, hydrogen has an atomic number of 1, meaning all hydrogen atoms have 1 proton in their nucleus. Similarly, helium has an atomic number of 2, indicating that every helium atom has exactly 2 protons in its nucleus.
The periodic table arranges elements in increasing atomic number, and this is the characteristic that makes each element unique compared to all others.
By looking at the periodic table, you can determine the atomic number of an element, and thus know how many protons its atoms contain. This makes the periodic table an indispensable tool for scientists and students alike.
An atom with _______________ electrons in its outer shell makes one happy, satisfied atom
A bond formed by electrical attraction between two oppositely charged ions is called
All our sources of fresh water, like rivers, wells, and aquifers, are dependent on
Name the stellar process in which the fusion of hydrogen produces other elements.
Nucleosynthesis is the stellar process in which the fusion of hydrogen produces other elements, such as helium. This process occurs through the proton-proton chain reaction in stars like the Sun.
Explanation:The stellar process in which the fusion of hydrogen produces other elements is called nucleosynthesis. During nucleosynthesis, hydrogen nuclei (protons) combine to form helium nuclei in a process known as the proton-proton chain reaction. This is an important example of nuclear fusion that occurs in the Sun and other stars, and it is responsible for the production of energy and the creation of heavier elements.
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which of the following elements have properties similar to those of strontium (Sr)
A: Y,Zr, Nb
B: Sb, Te, I
C: F, Br, I
D: Be, Mg, Ca
Answer: Option (D) is the correct answer.
Explanation:
It is known that elements which belong to same group show similar chemical properties.
This is because elements which lie in the same group have same number of valence electrons. Hence, they tend to show same type of reactivity which makes them exhibit similar chemical properties.
For example, Be, Mg, Ca and Sr are all group 2 elements. Hence, they tend to show similar chemical properties.
Thus, we can conclude that out of the given options Be, Mg, Ca elements have properties similar to those of strontium (Sr).
The quantity of valence electrons in an element's outermost atomic shell lies in what determines that element's valency. For all elements in the same group, the electrical configuration of the outermost shell is the same. Here the correct option is D.
The quantity of valence electrons in an element determines its physical and chemical properties. The number of valence electrons shared by elements belonging to the same group is constant. As a result, the physical and chemical properties of elements belonging to the same group are comparable.
Be, Mg, Ca and Sr are all group 2 elements. Hence, they tend to show similar chemical properties.
Thus, we can conclude that out of the given options Be, Mg, Ca elements have properties similar to those of strontium (Sr).
Thus the correct option is D.
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An action potential arriving at the presynaptic terminal causes what to occur? multiple choice voltage-gated calcium ion channels open, and calcium ions diffuse into the cell. voltage-gated sodium ion channels open, and sodium ions diffuse into the cell. acetylcholine diffuses into the cell. ligand-gated sodium channels open, and sodium ions diffuse out of the cell. voltage-gated sodium ion channels open, and sodium ions diffuse out of the cell.
An action potential arriving at the presynaptic terminal causes voltage-gated Ca²+ channels to open, allowing calcium ions to enter the cell and triggering the release of neurotransmitters into the synaptic cleft.
Explanation:When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated Ca²+ channels. Calcium ions enter the cell and initiate a signaling cascade that causes synaptic vesicles containing neurotransmitter molecules to fuse with the presynaptic membrane. This leads to the release of neurotransmitters into the synaptic cleft.
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What is the average speed of an object that travels 50 miles in 2 hours?
Question 3 options:
50 mph
25 mph
100 mph
2 mph
what percentage do the elements hydrogen and helium account for in the universe? A. 100% B. 99.9% C. 98% D.99.8%
Identify the more stable isotope in each pair.
What subatomic particle is responsible for combining the atoms together to form a new substance?
Answer : Electrons.
Explanation : The subatomic particle which is responsible for combining the atoms together to form a new substance is ELECTRON.
Electrons are negatively charged tiny particles which are found outside the nucleus and is one of the three subatomic particles. These are responsible for formation of new substance through transfer or sharing of electrons between the atoms of the elements. Mainly the outermost revolving electrons are the ones which undergoes transformation and forms new substance. It influences many physical and chemical properties of the substances.
How many electrons can the 7th energy level hold?
What is a sample of matter that has definite physical and chemical properties?
Difference between a proton, electron and neutron and where they are located