Answer:
the last one
Explanation:
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Because hydrogen forms compounds with oxidation numbers of both +1 and -1, many periodic tables include this element in both Group IA (with Li, Na, K, Rb, Cs, and Fr) and Group VIIA (with F, Cl, Br, I, and At).
There are many reasons for including hydrogen among the elements in Group IA. It forms compounds (such as HCl and HNO3) that are analogs of alkali metal compounds (such as NaCl and KNO3). Under conditions of very high pressure, it has the properties of a metal. (It has been argued, for example, that any hydrogen present at the center of the planet Jupiter is likely to be a metallic solid.) Finally, hydrogen combines with a handful of metals, such as scandium, titanium, chromium, nickel, or palladium, to form materials that behave as if they were alloys of two metals.
There are equally valid arguments for placing hydrogen in Group VIIA. It forms compounds (such as NaH and CaH2) that are analogs of halogen compounds (such as NaF and CaCl2). It also combines with other nonmetals to form covalent compounds (such as H2O, CH4, and NH3), the way a nonmetal should. Finally, the element is a gas at room temperature and atmospheric pressure, like other nonmetals (such as O2 and N2).
It is difficult to decide where hydrogen belongs in the periodic table because of the physical properties of the element. The first ionization energy of hydrogen (1312 kJ/mol), for example, is roughly halfway between the elements with the largest (2372 kJ/mol) and smallest (376 kJ/mol) ionization energies. Hydrogen also has an electronegativity (EN = 2.20) halfway between the extremes of the most electronegative (EN = 3.98) and least electronegative (EN = 0.7) elements. On the basis of electronegativity, it is tempting to classify hydrogen as a semimeta
Which of the following models best demonstrates the law of conservation of mass??
(LOOK AT THE PICTURES)!!
Answer:
i think its D
Explanation:
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.
Taking into account the law of conservation of mass,
The Law of Conservation of Matter is also called the law of conservation of mass or the Law of Lomonósov-Lavoisier. This law postulates that "The mass is not created or destroyed, only transformed."
This means that the reagents interact with each other and form new products with different physical and chemical properties than those of the reagents. And this is because the atoms of the substances are ordered differently.
But the quantities of the masses involved in a given reaction must be constant throughout it, that is, they will not have changed in their proportions when the reaction ends. Then the mass before the chemical reaction is equal to the mass after the reaction.
The exception to the rule is nuclear reactions, in which it is possible to convert mass into energy and vice versa.
Finally, the correct answer is option A. because the atoms of the substances are ordered differently, this is the reagents interact with each other and form new products.
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https://brainly.com/question/20081187?referrer=searchResultshttps://brainly.com/question/23986198https://brainly.com/question/13410855A) Devices that transfer kinetic energy have what for their source of power?
B) Why is burning kerosene for energy not the best solution?
C) Explain why there is not one right why of obtaining energy when it is not available
Answer:
A) Devices that transfer kinetic energy have a source of power that is in motion
Kinetic energy is the energy in motion, as such, a device that transfers kinetic energy transfers the energy the power source has into other energy forms
B) Kerosene does not easily cold start like diesel which can burn after compression
C) The first law of thermodynamics states that energy is conserved and it can neither be created nor destroyed, but can be changed from one form to another.
Therefore, when energy is not available in a given location or body, it cannot be obtained from that body or location
Explanation:
Which action would cause the chair to move to the left?
A. Applying 100 N of force to the chair from the left
B. Applying 100 N of force to the chair from the right
C. Applying 200 N of force to the chair from the right
D. Applying 200 N of force to the chair from the left
SUBMIT
PREVIOUS
How many moles do you have if you have 8.03 x 1023 atoms of oxygen?
Answer:
The answer is 1.33 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.03 \times {10}^{23} }{6.02 \times {10}^{23} } \\ = 1.33388704...[/tex]
We have the final answer as
1.33 molesHope this helps you
Part 1. Matching
Place the letter for the correct element category from the list below next to each description.
Part 2. Fill in the blank
Write the word or phrase that best completes each sentence. Choose from the following:
group, period, atomic number, periodic, metal, metalloid, nonmetal, chlorine, magnesium.
1. The elements on the periodic table are arranged in order of increasing _____________________.
2. The arrangement of the elements on the periodic table shows a predictable, repeating, ____________
pattern that allows us to predict chemical properties.
3. The elements Na, Mg, and Cu are each classified as ___________________ elements.
4. When elements are located in the same ______ they exhibit similar chemical and physical properties.
5. The element ________ is an example of an element that is classified as a nonmetal.
Part 3. Classifying
For each electron configuration identify the element and decide which group the element belongs to on the
periodic table. (Hint: Find the total number of electrons for each and refer to page 186 in your Student
Book to determine the element and group number.
Electron configuration Element Group number
1. 1s2
2s22p6.
2. 1s2
2s22p6
3s2.
3. 1s2
2s2
2p6
3s2
3p6
.
4. 1s2
2s2
2p6
3s2
3p6
4s2
.
5. 1s2
2s22p6
3s23p3.
A NATURAL APPROACH TO CHEMISTRY
_______
_______
_______
_______
_______ _______
_______
_______
_______
_______
1. ___ The element sodium (Na) belongs to this group of elements.
2. ___ These elements are not likely to chemically bond with other elements.
3. ___ These elements are located in the center of the periodic table.
4. ___ These elements tend to gain one electron to fill their outer shell and are sometimes colored gases.
5. ___ These elements have two electrons in their highest unfilled energy level.
Answer:
Try asking a friend or teacher
Explanation:
helps better than this site because alot of the answers are different even though they might of had the same test
What will an object do if its density is less than the density of water?
Sink
Float
Bob up and down
Move forward
Answer:
bob up and down
Explanation:
i think it is the answer i am not sure
Use the picture to answer the question.
Name at least three physical properties of the bowling
ball.
Answer:
The physical properties is hardness shape and color, I choose hardness because I have grabbed bowling balls before and they are very hard well there could be different types of bowling balls made of different things but I have never seen one or toughed a bowling ball that is not hard. Another physical property I chose for the bowling ball was shape, The reason I chose shape was because the bowling ball is circle, the actual name for a 3-D circle is sphere. The last physical property for a bowling ball is color because mostly all bowling balls have color for example the one in the picture it is red with a little bit of pink, there is many different bowling balls that have different color different hardness but NOT different shape. That is the physical properties of a bowling ball.
Explanation:
Hope this helps everyone who needed help with this :)
Given the standard heats of reaction
Reaction ∆H 0
M(s) + 2 X2(g) → MX4(g) −98.7 kJ/mol
X2(g) → 2 X(g) +327.3 kJ/mol
M(g) → M(s) −20.1 kJ/mol
calculate the average bond energy for a single
M-X bond.
Answer in units of kJ/mol.
Answer:
Explanation:
M(s) → M (g ) + 20.1 kJ --- ( 1 )
X₂ ( g ) → 2X (g ) + 327.3 kJ ---- ( 2 )
M( s) + 2 X₂(g) → M X₄ (g ) - 98.7 kJ ----- ( 3 )
( 3 ) - 2 x ( 2 ) - ( 1 )
M( s) + 2 X₂(g) - 2 X₂ ( g ) - M(s) → M X₄ (g ) - 98.7 kJ - 2 [ 2X (g ) + 327.3 kJ ] - M (g ) - 20.1 kJ
0 = M X₄ (g ) - 4 X (g ) - M (g ) - 773.4 kJ
4 X (g ) + M (g ) = M X₄ (g ) - 773.4kJ
heat of formation of M X₄ (g ) is - 773.4 kJ
Bond energy of one M - X bond = 773.4 / 4 = 193.4 kJ / mole
help me please im in 4th grade and online is frustrating
Answer:
A
Explanation:
The answer is A) because the A container has tightly packed molecules but not as tight as C so that means A is liquid, and C is a solid which makes B a gas
Answer:
The answer would be A
Explanation:
because in the first picture Liquid could be in many shapes like If I put water in my water bottle it would be the same shape as the water bottle.
In the third picture, the solid molecules will always be so close to each other like they will be stick to each other.
In the second picture, It will be separate always, as it cant stick to each other.
I hope I helped you!!!!
:)
What is the atmoic number for potassium?
Answer:
19
Explanation:
it is 19 for potassium
Bill Nye said the air pressure makes things what?
What is an intermolecular force?
O A. A force within a covalently bonded molecule
B. A force acting between the atoms within a molecule
O c. A force that holds a molecule together
O D. A force acting between two different molecules
Intermolecular force is the force acting between two different molecules. There are various kinds of intermolecular forces and the they differ in their strength.
What are intermolecular forces?Intermolecular forces are force of attraction or repulsion acting between two different molecules in a compound. The like charges of molecules repels and unlike charges will attracts together.
There are different kinds of intermolecular forces such as hydrogen bonding, Van der Waal's forces, dipole, dipole forces, London dispersion forces etc.
The strength of these forces vary from each other. The intermolecular force of attraction holds tow molecules together in a compound. Hence, option D is correct.
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What is the difference between a compound and a mixture?
Group of answer choices
A compound is just a mixture of elements.
A mixture can be physically separated into its components; a compound cannot be physically separated into its components.
The components of a mixture do not have the same properties individually as they do when mixed.
A compound can be physically separated into its components; a mixture cannot be physically separated into its components.
Answer:
Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances. Compounds can be of three types, which are: covalent compounds, metallic compounds and ionic compounds.
Answer:
The answer is a mixture can be physically separated into its components; a compound cannot be physically separated into its components.
Which of the following best describes a function of the nervous system as
discussed in class?
to store urine
O to move limbs
to receive stimuli from inside and outside the body
to take in oxygen and transport it to the cells
Answer: The answer is to receive stimuli from inside and outside the body.
Explanation:
I beg you please please I beg you help me please I’m litterly crying please :(
Repeat this calculation using Slater's rules to estimate the screening constant, S, and calculate Zeff for these two ions. Express your answers using two decimal places. Enter your answers numerically separated by a comma. 50 A 6 A 0 21 ? S. Zeff C, Zeff K+ =
Answer:
Cl^- = 5.75
K^+ = 7.75
Explanation:
Now let us calculate the effective nuclear charge four K^+ and Cl^- from Slater's rule.
Given that Cl^- and K^+ has electronic configuration of; [Ne] 3s2 3p6 (they are isoelectronic species)
We compute S as follows;
For n - 2 level, S= 1
For n - 1 level, S= 0.85
For ns,np level S= 0.35
Note: S= screening or shielding constant
1s2, S=2 ×1 = 2
2s2 2p6, S= 8×0.85 = 6.8
3s2 3p6, S= 7 × 0.35 = 2.45
The electron under study is not considered hence seven out of eight electrons in the shell are considered
Hence
S= 2 + 6.8 + 2.45 = 11.25
Since Cl^- has 17 electrons;
Zeff(Cl^-) = 17 - 11.25 = 5.75
For K^+
Zeff = 19 - 11.25 = 7.75
Which is the state of matter shown in this figure ?
Answer:
It looks like a solid because they are densely packed kind of like an ice cube
Explanation:
The state of matter shown in this figure is solid state, because the particles are arranged densely in the form of cube.
What is solid state ?The state of matter known as a solid has a definite form, mass, and volume. Changing the temperature causes extremely little variations in volume to be seen. For instance, sand, wood, copper, ice, etc., cannot be crushed.
One of the three fundamental states of matter, along with liquid and gas. Since atoms' energy drops when they adopt a comparatively organized, three-dimensional structure, solids can emerge from liquids or gases.
Because solids have specific mass, volume, and form, their component particles are arranged compactly. Between molecules, there is little intermolecular space. As a result, there is a strong force between the constituent particles (atoms, molecules, or ions).
Thus, option A is correct.
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Do you think that participation in a Supervised Agriculture Experience (SAE) prepares a student for a career in the AFN industry? Discuss why you agree or why you don’t. Discuss how your particular SAE has prepared you for your future career.
HELPPPP !! For horticulture
Answer:
The SAE curriculum includes practical farming tasks conducted outside the scheduled classroom and laboratory period by students. SAEs offer a method for students in agricultural education to gain real-world work opportunities that they are most interested in in the field of agriculture. Supervised agricultural experience is an essential component of agricultural education, and all Agriculture, Food and Natural Resources (AFNR) courses are a necessary component.
Explanation: Hope it helps
Which characteristic of a substance is considered a chemical property?
its boiling point
its reactivity
its density
its conductivity
Is this a chemical reaction? Explain your reasoning. (Will give brainliest)
yes , this is a reaction.
in this sodium hydroxide reacts with copper sulfate
A balloon is a sphere with a radius of 5.0 m. The force of air against the walls of the balloon is 45 N.
What is the air pressure inside the balloon?
Surface area = 12.56 × radius²
1 Pa = 1 N/m²
How would one solve this? What is an easy way to remember how to solve this problem or a list of steps to solve?
Answer:
1.4 x 10^-1 Pa
Explanation:
answer is above
Please tell me and why ?
Answer:
Thanks for the points
Explanation:
What is the relationship between the atomic mass of an element and a mole of the element atoms?
The mass of a pure substance represents a specific number of pure substance 'molecules', as defined by molecular weight. The relative atomic mass (atomic weight) in grams/mole (g/mol) is the molar mass of a substance, which means it is the mass of one mole of that substance.
These four ELEMENTS were found in early earth and they make up all living things.
A) True
B) False
The four elements:
Hydrogen
Oxygen
Carbon
Nitrogen
Answer: True
Air is a mixture of many things; it's not just Oxygen, but Hydrogen, Carbon, and Nitrogen as well are made up of air. Fun fact: Nitrogen is actually more abundant in air
what is the energy
Answer:
what type energy?
Explanation:
What is formed when a sodium atom and chlorine atom react chemically ?
Answer:
NaCl
Explanation:
NaCl is common table salt
Reacts together due to Na having a 1+ charge and Cl having a 1- charge
they bond together because their charges neutralize
Answer:
A neutron
Explanation:
WENOMECHAINSAMA TUMAJARBISAUN WIFENLOOOF ESELIFTERBRAUN
jk
its because they neutralize each other because one has a positive charge and one has a negative charge.
A science teacher heated liquid ethanol for an experiment. When he turned up the temperature, the ethanol quickly disappeared, and a strong aroma filled the room. What happened to the ethanol?
Answer:
Heating the particles in the ethanol energized them, and they escaped to fill the room as a gas
Explanation:
Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .
What do you mean by ethanol ?Ethanol is a primary alcohol that is ethane in which one of the hydrogens is substituted by a hydroxy group.
Ethanol is an important industrial chemical; it is used as a solvent, in the synthesis of other organic chemicals.
Ethanol produced either by fermentation or by synthesis is obtained as a dilute aqueous solution and must be concentrated by fractional distillation.
Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .
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What is a hypothesis? A. a statement that can be tested through a scientific investigation В. a statement that summarizes the results of an experiment C. a question that cannot be scientifically tested D. a description of the steps involved in an experiment
Answer:
A
Explanation:
Hope this helps :)
What is a catchy title for a science project on crystals?
Answer:
Crystal Clear Thinking
A Crystal Clear Idea
Crystals -The Diamond Wannabes of the World
Crystal Clear
Crystal Cool!
A New World ~ made Crystal Clear for You
The Science Behind The Shine
Crystal-ology
Classy Glass
Explanation:
Hope this helps and good luck with your project!
How does a hydra move?....In short form
Answer:
Hydras are generally sessile, but they can detach and move to another location by gliding slowly on their base. Sometimes they somersault, float, or use their tentacles to move along. ... If cut into several sections, a new Hydra will generate from each piece.
Explanation:
Answer:
Hydras are typically sessile, however they are able to detach and flow to every other place via way of means of gliding slowly on their base. Sometimes they somersault, float, or use their tentacles to transport along. ... If reduce into numerous sections, a brand new Hydra will generate from every piece.