Which of the following statements is/are correct?
I.
II.
Mass of 1 atom of Carbon-12 is equal to 1 amu
Mass of 4 atoms of Carbon-12 is equal to mass of 3 atoms of Oxygen-16
(A) Only I
(B) Only II
(C) Both I and II
(D) None of them
Answer:
The correct statement is;
(B) Only II
Explanation:
I) The atomic mass unit or amu which is also known as daltons which is defined as 1/12 × the mass of a carbon-12 atom, which is therefore, 1.660538921 × ⁻²⁴ grams
Therefore, the mass of 1 atom of carbon-12 = 12 amu
II) The mass of one mole of oxygen-16 is 16 grams while the mass of one mole of carbon-12 is 12 grams
The mass of 4 atoms of carbon 12 = 4 × 12 amu = 48 amu
The mass of 1 atom of oxygen-16 = 15.99491461956 amu
Therefore, the mass of 3 atoms of oxygen-16 = 3 × 15.99491461956 = 47.9847438587 amu ≈ 48 amu
Therefore only II is correct.
Two reproductive cells undergo meiosis. Each daughter cell undergoes meiosis. How many cells are produced when the daughter cells divide
Answer:
The correct answer is - 32 cells.
Explanation:
In the meiosis type of cell cycle or cell division, a single parent cell divides into four daughter cells, unlike mitosis. Meiosis takes place in the reproductive or sex cell and called reduction division.
As we know each cell divide into four daughter cells.
1 reproductive cell = 4 daughter cells
2 reproductive cell = 8 daughter cells
Now each daughter cell undergo meiosis than each cell will produce 4 cells so,
8 daughter cells will produce:
8 *4 = 32 cells.
Thus, the correct answer is - 32 cells.
A solution has a pOH of 12.4. What is the pH of this solution?
Answer:
pH = 1.6
Explanation:
pH + pOH = 14
=> pH + 12.4 = 14
∴ pH = 1.6
pls mark it as the brainliest
What is the chemical formula for fluoride?
Answer:b
Explanation:
Determine the number of electrons in the Cu2+ ion.
Answer: 27 electrons
copper has 29 protons in its nucleus. atoms can only lose or gain electrons. so because copper has 29 protons and will always have 29 protons, and the Cu2+ ion has a positive charge, there are more protons than electrons.
that means there should be 2 less electrons than protons. that leaves us with 29 protons and 27 electrons.
hope this helps :)
Which of the following is an example of how prosthetics engineering differs
from most other engineering fields?
A. Designing a device that is biologically compatible
B. Use of the engineering process to design
C. Predicting how the device will fail
D. Using a material that is sufficiently strong
Answer:
A. Designing a device that is biologically compatible
Explanation:
2
3
Question 13 (1 point)
Which statement best describes how many chlorine atoms are needed when making
Aluminum chloride?
5
3 chlorine atoms are needed because each chlorine atom accepts one of
Aluminum three valence electrons to obtain a full octet and makes chlorine a
negatively charged anion
9
12
3 chlorine atoms are needed because each chlorine atom accepts one of
Aluminums three valence electrons to obtain a full octet and makes chlorine a
positively charged anion
15
1 chlorine atom is needed because chlorine accepts one electron from
Aluminum to obtain a full octet and makes chlorine a negatively charged anion.
01 chlorine atom is needed because chlorine accepts one electron from
Lontot and molec chlorine positively charged cation
Answer:
3 chlorine atoms are needed because each chlorine atom accepts one of Aluminum three valence electrons to obtain a full octet and makes chlorine a negatively charged anion
Explanation:
How many chlorine atoms are needed when making Aluminium Chloride?
The formular for aluminium chloride is given as; AlCl3
In the compound, Aluminium has a valency of +3 and the three chlorine atoms each have a valency of +1 to make the compound a neutral compound.
That meas we can represent AlCl3 as Al³⁺ and 3Cl⁻
The correct statement is;
3 chlorine atoms are needed because each chlorine atom accepts one of Aluminum three valence electrons to obtain a full octet and makes chlorine a negatively charged anion
Name two metals which have a coating of another metal.
Answer:
Chromium is electroplated on other metals. 2. Gold is electroplated on other cheap metals.
Of which substance would an adult be able to consume the largest quantity before experiencing life-threatening effects?
Your answer:
botulinum
acetaminophen
sugar
water
salt
Answer:
Water
Explanation:
hope that helps:)
With carbon dioxide, what phase change takes place when pressure increases from 1 atm to 10 atm at -40C?
Answer:
See explanation
Explanation:
The phase changes of carbon dioxide is quite interesting. It is even more interesting that its phase change from gas to solid is dependent on pressure and temperature.
The triple point of CO2 is -56°C at 5.11 atm pressure. This implies that below 5.11 atm, liquid CO2 can not exist. In fact, at -78°C and 1 atm, CO2 is a solid.
Hence, when pressure increases from 1 atm to 10 atm at -40C, CO2 changes from liquid to gas.
Mastering Problems
Balancing Chemical Equations (10.1)
71. Write skeleton equations for these reactions.
a. hydrogen iodide(g) → hydrogen(g) + iodine(g)
b. aluminum(s) + iodine(s) — aluminum iodide(s)
c. iron(II) oxide(s) + oxygen(g) -> iron(III) oxide(s)
a. HI(g) ⇒ H₂9g) + I₂(g)
b. Al(s) + I₂(s)⇒AlI₃(s)
c. FeO(s)+O₂(g)⇒Fe₂O₃(s)
Further explanationGiven
word equations
Required
skeleton equations
Solution
The skeleton equation shows the chemical formula of the reaction between reactants and products, regardless of the actual amount of the reacting compound (unbalanced reaction)
The skeleton equations :
a. HI(g) ⇒ H₂9g) + I₂(g)
b. Al(s) + I₂(s)⇒AlI₃(s)
c. FeO(s)+O₂(g)⇒Fe₂O₃(s)
How is the weather in the two cities pictured most likely going to change in the next 24 hours
Answer:
theres no picture
Explanation:
Look at this image.
C is written in the middle and O is written on the left and right of C with four dots around each O. Two straight lines are drawn between C and each O.
What do the lines in this image represent?
Non-bonded valence electrons of oxygen
Valence electrons donated in carbon dioxide
Ionic bonds between carbon and oxygen
Double covalent bonds in carbon dioxide
Answer:
double covalent bonds in carbon di oxide
Carbon dioxide is a covalent compound formed by carbon and oxygen. There are two covalent double bonds between carbon and each oxygens. Thus option d is correct.
What is covalent bond?Covalent bond is a type of bond formed by the sharing of electrons between two atoms. Whereas, ionic bond is formed by lose or gain of electrons. Covalent bond is weaker than the ionic bond.
Carbon contains 4 electrons in its valence shell. Thus it needs 4 more electrons to attain stability. Oxygen contains two electrons in its valence shell and thus it needs 2 more electrons to become stable
A double bond is formed when two electrons are shared between two atoms. Thus, oxygen shares its two electron with carbon. And the second oxygen also shares its two electrons. Thus carbon attain 4 more electron and become stable.
Carbon shares its two electron with one oxygen and other two electron with the second oxygen thus, make each oxygen attains octet and become stable. Thus, the two straight lines between carbon and oxygen is double covalent bonds.
To find more about covalent bonds, refer the link below:
https://brainly.com/question/19382448
#SPJ2
all molecules are made of similar type of atom true or false
Answer:
False
Explanation:
Not all molecules are compounds, since some molecules, such as oxygen gas (above image of molecule of-O2) or ozone (O3), consist only of one element or type of atom. Water is also a molecule because it is made from atoms that have been chemically combined.
Why does reducing oil pollution in the oceans require an international effort?
Humans do not have the resources to stop ocean pollution.
Half of Earth’s oceans are not owned by any particular country.
Natural occurrences cause far more ocean pollution than human activities.
Cleaning oil pollution requires approval from the United Nations.
Answer:
Half of Earth’s oceans are not owned by any particular country.
Explanation:
Reducing oil pollution requires an international effort because ocean waters do not have boundaries and there are certain portion of the ocean that are not owned by any nation.
Oil pollution is a serious environmental issue. Oil spills can be carried by ocean currents from one place to another. They affect the aquatic ecosystem within a locality thereby reducing the biodiversity of life.International collaborations are sought to combat any issue of oil spillage due to global undertone to it.
How many carbon atoms are in each mole of calcium carbonate?
Answer:
5 atoms are in each molecule of calcium carbonate
Which is a gas at room temperature?
A) aluminum
B) nitrogen
C) potassium
D) sodium
Answer:
B) nitrogen
the Earth's atmosphere is mostly nitrogen
A chemist reacts 35 g of MgCl, with excess KOH according
to the reaction below. How much Mg(OH)2 would be
produced if the reaction goes to completion?
MgCl2 + 2KOH – Mg(OH)2 + 2KCI
Answer:
Mass = 21.58 g
Explanation:
Given data:
Mass of MgCl₂ = 35 g
Mass of Mg(OH)₂ produced = ?
Solution:
Chemical equation:
MgCl₂ + 2KOH → Mg(OH)₂ + 2KCl
Number of moles of MgCl₂:
Number of moles = mass/molar mass
Number of moles = 35 g/ 95.2 g/mol
Number of moles = 0.37 mol
now we will compare the moles of MgCl₂ and Mg(OH)₂
MgCl₂ : Mg(OH)₂
1 : 1
0.37 : 0.37
Mass of Mg(OH)₂ :
Mass = number of moles × molar mass
Mass = 0.37 mol × 58.32 g/mol
Mass = 21.58 g
How many molecules are in a gram?
Answer:
well, u can figure that out by multiply that amount by Avocado's number, which is 6.022x10 to the power of 23
A solution with a pH of 5 is ___ times as acidic as a solution with a pH of 6
Answer:
logarithmic
Explanation:
PLEASE HELP!! A model of an atom is shown below. Which element is represented by this
model?
Answer:
Carbon
Explanation:
A car is traveling at 120km/hr for 4hr.how far did the car travel
Answer:
it is a physics questions not chemistry
Explanation:
speed=distance/time
so distance =speed * time
=120*4
=480 km
Bohr models show _________ while Dot Diagrams show _______ electrons only.
Answer:
Bohr models show the electrons in atoms are in orbits of differing energy around the nucleus while Dot Diagrams show the bonding in a small molecule only.
Explanation:
An atom has three shells with 3 electrons in the last shell. This atom could be.....
O B
O Al
O Ga
O Si
b- How many electrons does sodium have?
Answer: sorry I’m late but it is 11 electrons
Explanation:
During the process of cellular respiration, water becomes oxygen.
True
False
Answer:
False
Explanation:
Please mark brainlliest if you want and mark 5 stars please. Thank you and have a good day.
CAN YOU EXPLAIN?
Which structures distinguish cells in multicellular plants and
animals from those of unicellular organisms, and why are
cells important for identifying organs and their functions?
Answer:
Explanation:
Outer skin cells form flattened stacks that protect the body from the environment. Muscle cells are slender fibers that bundle together for muscle contraction. The cells of multicellular organisms may also look different according to the organelles needed inside of the cell.
Explain why smell is a physical property?
Answer:
because no chemical change is happening
Explanation:
How do chemical reactions turn substances into new substances?
help! how do chemical reactions turn substances into new substances?
Answer:
I think it's B.
Calculate the density of chloroform
Answer: The density of chloroform is 1.47 g/mL
Explanation : Given,
Volume = 40.5 mL
Mass of cylinder = 85.16 g
Mass of cylinder and liquid = 145.10 g
First we have to calculate the mass of liquid (chloroform).
Mass of liquid = Mass of cylinder and liquid - Mass of cylinder
Mass of liquid = 145.10 g - 85.6 g
Mass of liquid = 59.5 g
Now we have to calculate the density of liquid (chloroform).
Formula used:
[tex]Density=\frac{Mass}{Volume}[/tex]
Now putting g all the given values in this formula, we get:
[tex]Density=\frac{59.5g}{40.5mL}[/tex]
[tex]Density=1.47g/mL[/tex]
Therefore, the density of chloroform is 1.47 g/mL