Answer:
8.2
Explanation:
To solve this problem;
The concentration of [H⁺] = 6.8 x 10⁻⁹mol/L
So, we need to convert this to pH:
pH = -log [H⁺]
So;
pH = -log 6.8 x 10⁻⁹ = 8.2
The gas that makes up about 21 percent of the atmosphere is blank
Answer:
oxygen makes up 21 percent of the atmosphere
PUN
Which of the following is an example of a Response to Change? (Read carefully, the other three are Adaptations)
(A)Thoms and Spikes as a protective mechanism
(B)Polar Bears transparent fur and black skin
(C)Plants turning toward the light
(D)Frogs webbed feet
The compound F2O has two lone pairs on the central oxygen atom. What's the structure of an F2O molecule? Is this compound polar or non-polar? Question 1 options: A) Bent or angular, polar B) Trigonal planar, polar C) Bent or angular, non-polar D) Trigonal planar, non-polar
Answer: A) Bent or angular, polar
Explanation:
The central atom oxygen has two lone pairs and two bond pairs in [tex]OF_2[/tex]. The number of electron pairs are 4, that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be tetrahedral. But as there are two lone pair of atoms around the central oxygen atom, repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent shape.
The compound [tex]OF_2[/tex] is polar as the net dipole moment of oxygen - fluoride bonds do not cancel each other out.
What are the eleven elements that are gas freezing?
hydrogen, helium, oxygen, nitrogen, argon, neon, fluorine, chlorine, krypton, xenon and radon i believe >__< not in any order ahaha
Answer:
hydrogen, helium, oxygen, nitrogen, argon and neon, fluorine, chlorine, krypton, xenon and radon
Explanation:
Which best describes what is represented by images 1 and 2?
Image 1 shows a polymer, and Image 2 shows a monomer.
Image 1 shows a monomer, and Image 2 shows a polymer.
Image 1 shows a macromolecule, and Image 2 shows a synthetic polymer.
Image 1 shows a synthetic polymer, and Image 2 shows a macromolecule.
Answer:
b
Explanation:
im doing a test about it
Answer:
b
Explanation:
An alpha particle has the same composition as a A) hydrogen nucleus B) deuterium nucleus C) beryllium nucleus D) helium nucleus
Answer:
Helium Nucleus
Explanation:
Answer:
Helium Nucleus
Explanation:
3 reasons why aluminium is used in making of cooking vessels
Answer is : It is a good thermal and electrical conductor. -The main point to be noted is that aluminium is a highly reactive element and still it is used for making cooking utensils. The reason is that aluminium has a very high affinity for oxygen. So, it reacts with oxygen and forms a layer of aluminium oxide on its surface.
Answer:
This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide . This oxide layer is very stable and prevents further reaction of aluminium with oxygen . Also , it is light in weight and a good conductor of heat Hence , it is used to make cooking utensils .
Explanation:
Believe it
How is this different than what happens when water changes from a liquid to
a solid?
PLEASEEEE HELPP
If 359 mL of a gas were contracted to only 269 mL, what would be the initial temperature of it if it measured 422 K after the change?
I NEED IT FAST!!
Answer:
T₁ = 563.19 K
Explanation:
Given data:
Initial volume = 359 mL
Final volume = 269 mL
Final temperature = 422 K
Initial temperature = ?
Solution:
The given problem will be solve through the Charles Law.
Charles Law:
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
T₁ = V₁T₂ / V₂
T₁ = 359 mL × 422 K / 269 mL
T₁ = 151498 mL.K / 269 mL
T₁ = 563.19 K
Help Please ! A substance that flows to the bottom of its container. Which option accurately describes this substance:
A) It can be a liquid or a solid
B) It is a solid or a gas
C) It is a gas
D) It is a liquid
Answer:
It is a solid or gas
Explanation:
solid or gas flow to the bottom of its container
If I have ten eggs and lots of milk, flour and oil, how many
crepes can I make?
Answer:
I'd say about 8?
Explanation:
if you wanna make them huge make about 6
How many electrons does one neutrally charged atom of argon have?
A 18
O B.22
C. 40
D. 58
Answer:
A. 18
Explanation:
A neutral charged atom is an atom with 0 charge.
Anyway, first look at the periodic table and find Argon.
After you find Argon, look at its Atomic number.
Its Atomic number is 18.
And a neutral atom of Argon has 0 charge.
So we need 18 electrons for Argon to cancel out and become neutral.
Basic math:
18 +( -18) = 0
Therefore, the correct answer is A. 18
Hope it helped!
One neutrally charged atom of argon (Ar) has 18 electrons. (Option B)
What is argon?Argon is an element with atomic number 18, which means it has 18 protons in its nucleus.
In a neutral atom, the number of electrons is equal to the number of protons. Therefore, a neutrally charged atom of argon will also have 18 electrons orbiting around the nucleus.
The number of electrons in an atom is determined by its atomic number and is essential for the atom's chemical properties and interactions.
Argon is commonly used as an inert gas in various applications, including welding, lighting, and as a protective gas in the manufacturing of electronics.
Learn more about argon at:
https://brainly.com/question/29528737
#SPJ6
Calculate the Molar Mass in g/mol of Ammonium Sulfate, (NH4)2(SO4)
Answer:
132g/mol
Explanation:
The problem here is to find the molar mass of the compound in g/mol
To solve this problem, we simply sum the atomic masses of the atoms in the compound:
(NH₄)₂ SO₄:
Atomic mass of N = 14g
Atomic mass of H = 1g
Atomic mass of S = 32g
Atomic mass of O = 16g
So;
Molar mass = 2[(14 + 4(1))] + 32 + 4(16) = 132g/mol
NEED ANSWER ASAP HELP!!!!
Answer:
1. 4 Km
2. 40 minutes
3. 0.1 Km/min
Explanation:
1. Determination of the total distance travelled.
From the graph given in the question above, we can see that the total distance travelled by the object is 4 Km since the path taken by the object in the graph ends at the 4 km mark.
2. Determination of the Time taken.
A careful observation of the graph given in the question shows that the entire trip took 40 minutes since the distance travelled by the object ends at the 40 minutes mark on the graph.
3. Determination of the average speed of the object.
Total distance = 4 Km
Total time = 40 mins
Average speed =..?
Average speed = Total distance / total time
Average speed = 4 / 40
Average speed = 0.1 Km/min
what volume of a 6.0% W/V glucose (C6H6O6) solution can be prepared using 185g of glucose?
Volume of solution : = 3083.3 ml = 3.0833 L
Further explanationGiven
a 6.0% w/v
185 g of glucose
Required
Volume of solution
Solution
% w/v : the mass of solute in a volume of solution or 1 g solute in 100 ml of solution
Can be formulated :
% w/v = (mass solute(g) : volume solution(ml)) x 100
Mass of solute = mass of glucose = 185 g
The volume of solution :
= 185 g : 0.06
= 3083.3 ml
= 3.0833 L
Which of the following is smaller than the atomic radius of oxygen (O)?
A. The ionic radius of sulfur (S)
B. The ionic radius of oxygen (O)
C. The atomic radius of fluorine (F)
D. The atomic radius of sulfur (S)
Answer:
C
Explanation:
Fluorine has a smaller atomic radius than oxygen.
I am listing the order starting with new moon.
New Moon
Waxing Crescent
first quarter
waxing gibbous
full moon
waning gibbous
last quarter
waning crescent
and new moon again.
Answer:
new Moon.
waxing crescent Moon.
first quarter Moon.
waxing gibbous Moon.
full Moon.
waning gibbous Moon.
last quarter Moon.
waning crescent Moon.
New moon
Explanation:
Your answer is correct
Explain, in your own words, what volumic mass is?
Answer:
Volumic mass is the density of a substance in its mass per unit volume. The symbol most often used for density is p.
How many atoms are in a molecule of RSq?
84 pt =_____ qt
5.0 gal =_____ L
Answer:
84 pt =__50.4399___ qt
5.0 gal =___18.9271__ L
Explanation:
Have A Wonderful Day!!
Answer: 84 pints = 42 quarts
5.9 gallons = 1.89271
Explanation:
Identify the common name of this free-living organism.
Tubular organism with tentacles surrounding its mouth; a cnidarian
Hydra
SORRY I DON'T KNOW CORRECT BUT
I THOUGHT THATH THIS IS A CATEPILLAR
PLEASE THANKS THIS ANSWER
What is the function of the vacuole?
to make proteins
for storage
to transport materials
to control all cell functions
Explanation:
In animal cells, vacuoles are small and help sequester waste products. In plant cells, vacuoles help maintain water balance. Therefore the answer should be B. For Storage
Hope this helps!
Please mark brainliest!
Hello help pleaseeee
Answer:
1) Non metals
2) The melting point increase as we go down the group.
3) The boiling point also increase as we go down the group.
4) The halogens grow darker as we move down the group.
5) The same happens for Iodine as the boiling point and melting point increase as we go down the group.
6) Bromine is more reactive than Iodine as because the size of iodine is greater than that of Bromine.
7) The size of atoms become bigger and larger.
8) Nucleus of every atoms of different elements contain neutron and proton and the nucleus is covered by shells.
9) Because they are placed vertically second from the right in the periodic table.
queries comment me!!
Answer:
1) Non metals
2) The melting point increase as we go down the group.
3) The boiling point also increase as we go down the group.
4) The halogens grow darker as we move down the group.
5) The same happens for Iodine as the boiling point and melting point increase as we go down the group.
6) Bromine is more reactive than Iodine as because the size of iodine is greater than that of Bromine.
7) The size of atoms become bigger and larger.
8) Nucleus of every atoms of different elements contain neutron and proton and the nucleus is covered by shells.
9) Because they are placed vertically second from the right in the periodic table.
Explanation:
what is the mass in grams of a sample of 7.3 x 10^23 molecules of (iodine heptafluoride) IF7
320 g IF₇
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.3 × 10²³ molecules IF₇
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of I - 126.90 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of IF₇ - 126.90 + 7(19.00) = 259.9 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 7.3 \cdot 10^{23} \ molecules \ IF_7(\frac{1 \ mol \ IF_7}{6.022 \cdot 10^{23} \ molecules \ IF_7})(\frac{259.9 \ g \ IF_7}{1 \ mol \ IF_7})[/tex]Multiply/Divide: [tex]\displaystyle 315.056 \ g \ IF_7[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
315.056 g IF₇ ≈ 320 g IF₇
Atoms have been traditionally viewed as being composed of three different types of particles: protons, neutrons, and electrons. However, research done by Louis de Broglie and expanded upon by Erwin Schrödinger changed how scientists viewed electrons. How has our increased understanding of the electron led to current atomic models?
Answer:
See explanation
Explanation:
Before the advent of the wave-particle duality theory proposed by Louis de Broglie, there was a sharp distinction between mater and waves.
However, Louis de Broglie introduced the idea that mater could display wave-like properties. Erwin Schrödinger developed this idea into what is now known as the wave mechanical model of the atom.
In this model, electrons are regarded as waves. We can only determine the probability of finding the electron within certain high probability regions within the atom called orbitals.
This idea has been the longest surviving atomic model and has greatly increased our understanding of atoms.
What is the density in units of g/mL of a substance with a mass of 20.0 g and a volume of 4. 0 mL?
Answer:
5 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{20}{4} = 5 \\ [/tex]
We have the final answer as
5 g/mLHope this helps you
Which is an empirical formula? C₂H₄ C₃H₆ P₂O₅ P₄O₆
Answer:
C3H8
Propane/Formula
Explanation:
hope this helps
The electrical charge of the nucleus is determined by:
a. the number of neutrons only
b. the number of protons and neutrons together
c. the number of protons only
d. the number of electron only
_is the only metal that normally exists on earth as a liquid
Answer:
Mercury
Explanation:
mercury, and it's the only metal that normally exists on Earth as a liquid.
Tutorial Service is considered as what type of product?
Answer:
A tutorial, in education, is a method of transferring knowledge and may be used as a part of a learning process. More interactive and specific than a book or a lecture, a tutorial seeks to teach by example and supply the information to complete a certain task.