Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.
Answer:
A compound is a unique substance that consists of two or more elements combined in fixed proportions.
Explanation:
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2 2.5.2 Test (CST): Computer-Scored Unit Test
Question 23 of 25
Which of the following best defines an acidic solution?
A. A solution with a pH greater than 7
B. A solution with a pH less than 0
C. A solution with a pH equal to 7
D. A solution with a pH less than 7
SUBMIT
Answer:
a solution with pH greater than 0
Explanation:
What is the angle between the following two hybrid orbitals on the same atom?
(a) sp and sp hybrid orbitals:
degrees
(b) sp and sp hybrid orbitals:
es
degrees
(c) sp and sp2 hybrid orbitals:
degrees
Answer: a) sp and sp hybrid orbitals:
180 degrees
(b) sp and sp hybrid orbitals:
es
120 degrees
(c) sp and sp2 hybrid orbitals:
109.5 degrees
Explanation:
The angle between the following two hybrid orbitals on the same atom is sp and sp hybrid orbitals: 180°, sp and sp hybrid orbitals: 120° and sp and sp2 hybrid orbitals: 109.5°
What is hybrid orbitals?Hybrid orbitals are defined as the outcome of a model that generates a new set of orbitals by combining atomic orbitals on a single atom.
It can also be defined as a form of atomic orbital that emerges when two or more atomic orbitals of an isolated atom mix.
It can be defined as the forming new atomic orbitals by combining two or more common atomic orbitals.
The process which forms hybrid orbitals are known as hybridization.
There are mainly five types of hybridization.
LinearTrigonal planerTetrahedral Trigonal bipyramidal OctahedralThus, the angle between the following two hybrid orbitals on the same atom is sp and sp hybrid orbitals: 180°, sp and sp hybrid orbitals: 120° and sp and sp2 hybrid orbitals: 109.5°
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exchanges gases ( O2 and CO2) between the air and the blood
Answer:
Explanation: Hankins is waiting
19. When you cut an apple in half. What type of change has occurred?
A.
Ichemical
C.
temporary
B.
physica
D.
reactive
Answer:
Physical
Explanation:
Nothing has chemically happened and the change is permenant therefore it is physical
PLEASE HELP ME WITH THIS I ONLY HAVE 8 MINUTES I will give you extra points . THANK YOUU
The scientific community dismissed John Needham’s attempt to prove spontaneous generation. What was the reason that they gave? *
A. By sealing off the flask he deprived the environment of air, a requirement of spontaneous generation
B. He used the wrong type of flask
C. He left the flasks open to the air for too long
D. He did not boil his broth long enough and the flasks were not cleaned prior to the experimenter.
Answer:
He did not boil his broth long enough and the flasks were not cleaned prior to the experimenter
what is a compound substance
Answer:
A compound is a substance that contains atoms of two or more different elements.
Explanation:
Please mark my answer no. 1
What tiles should I put in the box?
Answer:
true&answe
Explanation:
please answer this correctly
Answer:
B. basic
Explanation:
Because acidic is sour in test, salt is tasty in taste, and neutral neither bitter, tasty and nor sour
A solar eclipse occurs during the day and can occur only during what phase of the moon?
New moon
Full moon
Answer:
New moon
Explanation:
Answer:
it is new moon
Explanation: im just smart like that
What term refers to a group of nerve cells that are connected to one another?
A. neuron
B. nerve network
C. brain
D. cerebrospinal fluid
Why do scientists use remotely operating vehicles (ROVs) in scientific study?provide an example of their use
Answer:
Remotely operated vehicles, or ROVs, allow us to explore the ocean without actually being in the ocean. ... Additional equipment, such as a manipulator or cutting arm, water samplers, and instruments that measure parameters like water clarity and temperature, may also be added to vehicles to allow for sample collection.
Explanation:
17 Polly has a pencil that is 21 cm long. How long is the pencil
Answer:
The pencil is 8.268 inches
How many moles of CH 3CH 2OH are contained in 280 mL of 0.0788 M CH 3CH 2OH solution?
4.32×10−2mol hope it helps
which chemical formal shows an ionic compound? A. CO2 B.N 2 O C.NaCI D.C6 H12 O6
Answer:
B
N2O
Explanation:
maybe
d can also be lol
describe the structure of a typical metal such as iron ?
assaaap
Answer:
Metals consist of giant structures of atoms arranged in a regular pattern. The electrons from the outer shells of the metal atoms are delocalised , and are free to move through the whole structure. This sharing of delocalised electrons results in strong metallic bonding .
Explanation:
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Darrell has 35 grams of melted chocolate. He pours all of the melted chocolate in molds. After he allows them to cool, Darrell has two solid bars of chocolate.
If the two solid chocolate bars contain all of the melted chocolate, what is their combined weight?
A.
It depends on how long it took the chocolate to cool.
B.
The chocolate bars weigh more than 35 grams.
C.
The chocolate bars weigh exactly 35 grams.
D.
The chocolate bars weigh less than 35 grams.
Answer:
A
Explanation:
it is correctly right????
Answer:
B.
The chocolate bars weigh more than 35 grams.
Fill in the [?]
73,542 m = [?] km
Give your answer in standard form.
What is the answer with the proper significant figures 7.6+2.401+0.68=
Answer:
10.7
Explanation:
The addition of 7.6 + 2.401 + 0.68 = is 10.681.
According to the addition of sig figs, you want your answer to have the same amount of places, after the decimal point, as the least sig-fig figure.
7.6
2.401
0.68
+
----------
10.681 - Draw a line straight down from the least sig-fig figure (7.6)
So the maximum figure after the decimal point is one. Since 8 is greater than 5, you have to round up from 10.6 to 10.7.
What causes high and low tides on Earth? A. The moon's gravitational pull on Earth causes water to bulge on two sides of Earth.B. Earth's rotation is so fast, water will swell and shrink twice a day.C. Earth is tilted on an axis, causing water to spread unevenly throughout the planet.D. Water swells when tsunamis occur in two areas of Earth at the same time. PLZ HELP FAST
Answer:
A.
The moon's gravitational pull on Earth causes water to bulge on two sides of the Earth.
Why does the velocity of catalyzed reaction reach maximum at certain
concentration of enzyme?
Answer:
Because the total energy of the enzyme has been used up and actions already complete
Explanation:
Catalyst are substance known to speed up rate of chemical reaction just like taking a short pathway. When velocity of catalyzed reaction reach maximum, at that moment reaction has reach it full potential (there is an equilibrium in reaction). there won't be any changes on further addition, and mostly indicate that Reaction is Complete
if 0.400 moles CO and 0.400 moles O2 completely react how many grams of CO2 are produces?
2CO+O2 becomes 2CO2
If 0.400 moles CO and 0.400 moles O2 completely react, 17.604 grams of CO2 would be produced.
First, let us look at the balanced equation of reaction:
[tex]2CO + O_2 ---> 2CO_2[/tex]
According to the equation, the mole ratio of CO and O2 is 2:1. But in reality, the mole ratio supplied is 1:1. Thus, CO is the limiting reactant while O2 is in excess.
Also from the equation, the ratio of CO consumed to that of CO2 produced is 1:1. Thus, 0.400 moles of CO2 would also be produced from 0.400 moles of CO.
Recall that: mole = mass/molar mass
Therefore, the mass in grams of CO2 that would be produced from 0.400 moles can be calculated as:
Mass = mole x molar mass
= 0.400 x 44.01
= 17.604 grams
More on calculating mass from number of moles can be found here: https://brainly.com/question/12513822
which of the following are examples of single replacement reactions select all that apply.
1) Ca(OH)2(aq) + 2 HCl(aq) ----> CaCl2(aq) + 2 H2O(l)
2)Mg(s) + Zn(NO3)2(aq) ------> Mg(NO3)2(aq) + Zn(s) 3)Na2S(aq) + Cd(NO3)2(aq) ----> 2 NaNO3(aq)
4) K(s) + 2HCl(aq) ----> 2KCl (aq) +H2(g)
Answer:
4
Explanation:
please mark brainiest
K(s) + 2HCl(aq) ----> 2KCl (aq) +H2(g) is an example of single replacement reactions.
What do you mean single replacement reactions?A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound.
Single-replacement reactions always involve two pure elements and one aqueous compound/solution. In the above reaction, the A and C would be pure elements.
A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.
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1. Since the electron has a negative electric charge and the nucleus has a positive
electric charge, where would you expect to find electrons in atoms?
37. A patient had pale tinger nail, shortness of breath and felt dizzy. The patient is most likely suffering from A. Kwashiorkor B. Marasmus C. Anaemia D. Rickets
Answer:
Anaemia
Explanation:
Symptoms: fatigue, skin pallor, shortness of breath, lightheadedness, dizziness, or a fast heartbeat.
How many more electrons does each oxygen atom need to be stable?
5. How many total atoms are in one molecule of NH3?
4 atoms
1 atom
2 atoms
3 atoms
Answer:
4 or 3 atoms; leaning towards 4 more
Explanation:
Answer:
3 atoms
Explanation:
The substance chlorine monoxide, ClO(g), is important in atmospheric processes that lead to the depletion of the ozone layer. The ClO molecule has an experimental dipole moment of 1.24 D and the Cl−O bond length is 1.60 Å.
Part A: Determine the magnitude of the charges on the Cl and O atoms in units of the electronic charge, e.
Part B: Based on the electronegativities of the elements, which atom would you expect to have a partial negative charge in the ClO molecule?
Atom O or Atom Cl
Part C: Using formal charges as a guide, propose the dominant Lewis structure for the molecule. (Draw a diagram)
Part D: The anion ClO− exists. What is the formal charge on the Cl for the best Lewis structure for ClO−?
A) The magnitude of the charges on CI and O atoms are : +0.16e and -0.16e respectively
B) Atom O will have a partial negative charge on the CIO molecule
C) Attached below
D) The formal charge on Cl is +3
A) Determine magnitude of charges on CI and O
Magnitude of charge = dipole moment / bond length --- ( 1 )
where : dipole moment = 1.24 D * [tex](\frac{3.34*10^{-30} C m}{1 D} )[/tex]
Bond length = 1.60 A° * [tex]( \frac{10^{-10} m}{A^{0} } )[/tex]
∴ Magnitude of charge = 2.56 * 10⁻²⁰ C
Note : Charge of an electron = 1.602 * 10⁻¹⁹ C
Therefore the magnitude of charges on CI and O atoms is
2.56 * 10⁻²⁰ C * [tex]\frac{1e}{1.602*10^{-19} }[/tex] = 0.16 e
Therefore
charge on CI = +0.16e
charge on O = -0.16e
Hence we can conclude that A) The magnitude of the charges on CI and O atoms are : +0.16e and -0.16e respectively and Atom O will have a partial negative charge on the CIO molecule also The formal charge on Cl is +3
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Which two substances are among the four major types of organic
compounds made by living things?
A. Potassium
B. Water
C. Carbohydrates
D. Proteins
Answer: Carbs and proteins
Explanation:
Answer:
the answer is proteins
Explanation:
did the problem
Suppose a solution has a pOH of 5.3. What is the concentration of hydronium ion, H3O+, in the solution?
The concentration of hydronium ion, H3O+, in the solution with pOH of 5.3 is 1.99 × 10-⁹M.
HOW TO CALCULATE HYDROGEN CONCENTRATION:
The pOH of a solution is given as 5.3. The pH of this solution can be calculated as follows:pOH + pH =145.3 + pH = 14pH = 14 - 5.3 = 8.7pH = 8.7.The hydrogen ion concentration can be calculated by using the following expression:[H+] = 10-pH[H+] = 10-⁸.⁷[H+] = 1.99 × 10-⁹MTherefore, the concentration of hydronium ion, H3O+, in the solution with pOH of 5.3 is 1.99 × 10-⁹M.
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