Answer:
C, physical change
Explanation:
take a look at the equation. Next to each form of water do you see the little (g) and (l)? These represent the state of matter the water is in. So, the water is going from a gas to a liquid. The chemical compound is the same so its a physical change, not chemical, and it is reversible. You could change the liquid water back to the gas through evaporation. Endothermic has literally nothing to do with this equation so you can easily eliminate that answer choice.
The increase in metabolic rate after a meal is called
Answer:
The thermic effect of food.
Explanation:
The process in which metabolic rate increase after meal is called the THERMIC EFFECT OF FOOD.
THERMICAL EFFECT OF FOOD can be defined as the way in which some calories a person or an individual consumed after meal help to break down the food for easy absorbing and to store the food consumed while some are burn off during execise which is why a person or an individual metabolic rate may elevate after meal, during exercise or due to some other factors reason been that human body makes use of energy everyday due to day to day activities.
Example a person who consumed a protein food may experience high THERMIC EFFECT than the person who consumed food that contained fat or carbohydrates reason been it can take a long time for such person body to break down the food, burn and absorb the protein.
Therefore The increase in metabolic rate after a meal is called THERMIC EFFECT OF FOOD.
Which of the following BEST explains why the tectonic plates of Earth move?
Answer:
The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth’s mantle and fit snugly against one another. The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other.
Help me please !!!?!!???
Answer:
column
hope this helps
Explanation:
tell me if it's right
Answer:
Explanation:
That column of elements is commonly called the Halogens.
The electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown below.
Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?
electron dot diagram of chlorine
A. 35Cl1-
B. 35Cl2-
C. 35Cl1+
D. 35Cl
what is the formula for potassium?
Answer:
Density 3.12 g/cm³
Melting Point 681 °C
Boiling Point 1,330 °C
Explanation:
What month and what year did Matthias Schleiden contribute to the cell theory.
Plsssssssss help
Answer:
Matthias Jacob Schleiden was a German botanist who, with Theodor Schwann, cofounded the cell theory. In 1838 Schleiden defined the cell as the basic unit of plant structure, and a year later Schwann defined the cell as the basic unit of animal structure.
Explanation:
IMPORTANT IMPORTANT NEED TO GET OFF SOON BC ITS MY BROTHERS BIRTHDAY PLEASEEEE NEED THIS EXTREMELY BAD ❤️ FOR A BIG GRADE TOO
its d because it has to be diagnoly to the right
Answer:
I think C
happy birthday to your brother though
why is true about electron dot diagrams
Answer: The correct answer is the option: B. An element with eight valence electrons is chemically unstable.
Explanation:
Hello! Let's solve this!
We will analyze each of the options:
A. The group number of the element provides a clue to the number of valence electrons: it is correct, since it provides the number of valence electrons.
B. An element with eight valence electrons is chemically unstable: this is not correct, since elements with eight electrons in the valence shell cannot react because they already have the last complete shell. Therefore, they are chemically stable.
C. The points must be placed one at a time on each side of the chemical symbol: it is correct, because that is the way to make the point diagram.
D. An atom is chemically stable if all the points are paired: this is correct since this verifies that the point diagram has been done well.
We conclude that the correct answer is the option: B. An element with eight valence electrons is chemically unstable.
Hope this helps..... Stay safe and have a Merry Christmas!!!!!!!!! :D
Identify the group or period that matches each description.
a. Elements with 6 energy levels
b. Elements with 2 valence electrons
Answer:
a.6th period
b.groupIIA
Why isnt water on the periodic table?
Answer:
Because its not a pure substance. It is a combination of pure substances.
Explanation:
Arange the following elements, from top to bottom, in the correct order of increasing atomic radius starting with the smallest.
Te
St
Rh
S
In
Answer:
The real order is
Rb(37)
Sr (38)
In(49)
Sb (51)
Te(52)
Explanation: Good luck
Elements, from top to bottom, in the correct order of increasing atomic radius starting with the smallest is Rh ( 37 ), St( 38 ), In ( 49 ), S ( 51 ), Te ( 52 ).
What is an element ?A chemical element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
Any compound that cannot be broken down into simpler chemicals by regular chemical processes is referred to as a chemical element or element. The building blocks of which all matter is made are called elements.
Protons, neutrons, and electrons make up atoms. A compound can be created by combining two different types of atoms. A molecule is a group of atoms that can't be separated from the bigger material it is a part of while still keeping its characteristics.
Thus, Rh ( 37 ), St ( 38 ), In ( 49 ), S ( 51 ), Te ( 52 ) this is the correct order of an element increasing atomic radius starting with the smallest.
To learn more about an element, follow the link;
https://brainly.com/question/13025901
SPJ2
A space probe is launched from the surface of Earth into space. After 30 minutes, the space probe runs out of fuel and the rocket engine stops but the space probe continues moving at
a constant speed. What concept explains this phenomena?
friction
gravity
inertia
mass
Answer:
inertia
Explanation:
because an object will keep moving until something slows it down, the probe is still going because of inertia.
Which of the following is a compound?
A. Zinc
B. S8
C. CaCl2
C. Calcium is your best bet. Calcium chloride is amongst inorganic compounds.
Which of the following is not part of a flower's pistil?
ovary
style
stigma
anther
Answer:
anther is not a part of the flower pistil
2. Calculate the mass of 2.4 moles of
ammonia, NH3.
Answer:_grams
A student performing this reaction
makes 8.5 grams of ammonia, NH3. How
many moles of ammonia did she make?
Answer:_moles
Question:
Type your driving question here:Why are the northern lights produced? How many light reveal the
behavior of electrons in atoms
Claim:
What is the answer to the question? (1 sentence)
Type your claim here:
I
Supporting Evidence #1:
How do you know your claim is the answer to the
question? (The facts that support the claim.)
Type your evidence here (1-2 sentences):
Supporting Evidence #2:
How do you know your claim is the answer to the question?
(The facts that support the claim.)
Type your evidence here (1-2 sentences):
Answer:
What?
Explanation:
Which shows the atoms in order of decreasing atomic radii? A) F, Cl, Br B.) Cl, F, O C) S, Cl, F D) N, C, B
Answer:C) S, Cl, F shows the decreasing order of atomic radii across a period and down a group
Explanation:
The Trend of atomic radius in a period occurs like this :
decreases from left to right as you go across a period. This is because of the shrinking of the nucleus as electrons are being added to the same orbital or shell conferring on the nucleus a positive charge as protons are also being added to the nucleus causing an attraction of the positively charged nucleus to electrons.
Increase down the group-This is because of the increasing energy levels caused by an increase in the number of shell causing a gap between outermost shell and the nucleus.
--Therefore On the same group, as you move across the period 3, Sulphur has a larger atomic radius than chlorine and on group 17 chlorine has a larger atomic radius than Fluorine.
How is energy transferred when..
Answer:
Number 1 is Conduction. Number 2 is Radiation. Number 3 is Convection. i think if thats how im supposed to word it...
Explanation:
Answer:
1. Each collision passes energy from particles moving quickly to particles moving slowly. In this way, the energy spreads throughout the pan and finally reaches the handle. This process is called conduction. Conduction is the transfer of heat that happens when particles collide with each other.
2. A fire spreads by transferring heat energy in three ways: Radiation, Convection, and Conduction. Radiation refers to the emission of energy in rays or waves. Heat moves through space as energy waves. ... This is the reason that when facing the fire, only the front is warmed.
3. The ways in which energy is dissipated depends on the system: ... for a tumble dryer, the electrical work is transferred into useful internal (thermal) energy which helps to dry clothes and energy is dissipated wastefully by sound waves which cause a rise in the internal energy store (temperature) of the surroundings.
Explanation:
Hope this is what you were looking for! Brainliest please?
How many moles are in 48 grams of Chlorine? ( hint remember some elements are diatomic)
Answer:
bcdhbhdbfsjbcs,kfhgbsaefg
Explanation:
srry preicsoe pntosod
a student lists three temperature measurements 100 f , 100 c, and 100 k of the highest temps 100 k is the highest true or false
Answer:
False, it is actually 100 kelvins
Explanation:
The reaction between nitrogen and hydrogen to produce ammonia is described by the equilibrium reaction:
3H2 + N2 = 2 NH 3 3H2
What substances are present in the reaction mixture when equilibrium has been obtained.
Answer:
Explanation:
The formation of ammonia that occurred by the reaction of nitrogen and ammonia is expressed as:
[tex]3H_{2(g)} + N_{2(g)}[/tex] ⇄ [tex]2NH_{3(g)}[/tex]
where;
The reactants are:
Hydrogen and nitrogen
The product is ammonia.
For the reaction, the equilibrium constant can be expressed as:
[tex]K = \dfrac{[product]}{[reactants]}[/tex]
[tex]K = \dfrac{[NH_3]^2}{[N_2]^3[H_2]^3}[/tex]
From the equilibrium constant conditions, the formation of ammonia and its decomposition due to its reversible reaction back to hydrogen and nitrogen are equal. It implies that the rate of the forward reaction is also equal to that of the backward reaction.
Thus, during when equilibrium is obtained;
Hydrogen, Nitrogen, and Ammonia are present.
Can someone help me
Answer:
Is it D?
Explanation:
Will Mark Brainliest!
There are several ways to model a compound. One type of model is shown.
4 C's are connected in a line by 3 black lines. The C on the left has 3 H's attached to it each by a black line. The next C has 1 H attached by a black line and 1 O attached by 2 black lines. The next C has 2 H's attached to it by 1 black line each. The last C has 2 H's attached to it by 1 black line each and 1 O attached by a single black line. That O has an H attached to it by 1 black line.
What is the chemical formula for the molecule represented by the model?
CHO
C4H9O2
C4H8O
C3H8O2
Answer:
C₄H₉O₂
Explanation:
just count the amount of atoms present in the model.
Answer:
there now u can give him/her brainliest!! :)
Explanation:
What is the Kinetic Energy of a 478kg object that is moving with a speed of 15m/s?
Answer:
53,775 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 478 \times {15}^{2} \\ = 239 \times 225[/tex]
We have the final answer as
53,775 JHope this helps you
Elements bond when they share or transfer their outer shell electrons which are called valence electrons
True
False
Answer:
True
Explanation:
The following Lewis structures represent valid resonance forms. true or false
Answer:
true
Explanation:
because Lewis represent valid resonance
The given Lewis structure does not show valid resonance form. So,the given statement is false.
What is Lewis structure?The Lewis structure is the representation of the of valence shell in the molecule.
What is valence electron?The electron present in outermost shell and which involve in chemical bond formation is called valence electron.
What is resonance structure?Resonance is way to explain the localisation of electron in molecule where Lewis formula fails to describe.
The given statement is false because both structure shows different number of valence electron.
To learn more about Lewis structure here.
https://brainly.com/question/27037762
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Whats the equation and answer for these two separate questions!!
Answer:
3).
[tex]time = \frac{distance}{speed} \\ time = \frac{225}{3} \\ time = 75 \: s[/tex]
4).
[tex]speed = \frac{distance}{time} \\ speed = \frac{110}{55} \\ speed = 2 \: {ms}^{ - 1} [/tex]
Engineers are developing a process to produce phosphorus pentachloride.
Which two criteria are the most essential when developing this process?
A. Any additional products of the process should also have
commercial uses so they can be sold to various industries.
B. The process should maximize the production of products from
reactants.
O C. The workers who operate the process should be able to run the
equipment safely.
D. All processes should involve technologies that produce the
product in a way that is similar to how it was produced before.
Answer:
Options B and C are the two criteria that are most essential
Explanation:
When trying to develop a novel process, it is important that the new process involves the use of equipment that can be operated safely by workers so as to prevent death or injury in the cause of handling this equipment. If this equipment is seen not to be safe or cannot be handled safely by workers, it can/will force workers to previous or alternative methods that require more safe equipment.
Also, the process must be able to maximize the most of the reactants, i.e the process must be able to convert a good percentage of the reactants into the desired product (phosphorus pentachloride) since that is the focus. This will also lead to reduction of byproducts produced which could be useful or otherwise (a loss).
Answer:
It is B and C.
Explanation:
I just got them right on A p E x
Which statement describes compounds?
A) Compounds are made of one type of atom.
B) Compounds cannot be represented by models.
C) Compounds are represented by chemical formulas.
D)Compounds cannot be broken down into simpler forms.
Answer:
C
Explanation:
What is the definition of threadlike filaments and tubules that crisscross the cytoplasm
