Answer:
A polar covalent bond is a covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal. In a polar covalent bond, sometimes simply called a polar bond, the distribution of electrons around the molecule is no longer symmetrical.
Explanation:
Where do properties of matter come from?
Answer:
Extensive or inextinsive and either physical or chemical
How many atoms are in 80.45 g of magnesium with explanation
Answer:
There are 1.9926 * 10 ^24 atoms.
Explanation:
M ( Mg ) = 80.45 g
We can find the molar mass of magnesium in the Periodic table:
M ( Mg ) = 24.31 g / mole
n = 80.45 g : 24.31 g/mole = 3.31 moles
N a ( Avogadro`s constant ) = 6.02 * 10 ^23
N = Na * n = 6.02 * 10 ^24 * 3.31 = 19.926 * 10 ^23
True/False: For the same system, heterogeneous nucleation will occur at less undercooling than homogeneous nucleation.
Answer:
True.Explanation:
same system, heterogeneous nucleation will occur at less undercooling than homogeneous nucleation.
Please read question
Answer:
cant see it
Explanation:
A sample of a compound contains 1.65 × 10²³ atoms of C, 0.552g of H, and 4.39g of O. What is the molecular formula and molar mass of the compound?
Answer:
C1 H2 O16
Explanation:
Choose all the answers that apply.
What’s is the freezing point of water?
1. 0’c
2.32’c
3.32’F
4.0’F
Answer: The answers are the first and third options.
Answer:
1.0'c
3.32'f
Explanation:
How is a chemical equation different from mathematical equation?
Only chemical equation uses + sign
Only chemical equation uses arrow instead of = sign
Only chemical equation has numbers
Only chemical equation has minuses
Answer:
Only chemical equation uses arrow instead of = sign
Answer:
Only chemical equation uses an arrow instead of a = sign.
A chemical equation depicts a chemical reaction by utilising chemical formulae and symbols to depict the reactants, products, and chemical changes that take place. In a chemical equation, the arrow indicates the direction of the reaction and is commonly depicted as a single arrow pointing from the reactants to the products. In contrast, the equals sign (=) is commonly used in mathematical equations to indicate that two expressions have the same value.
While numbers are used to indicate the relative proportions of reactants and products and minus signs are used to indicate reactants or products in the form of ions, the arrow is the most distinguishing feature that distinguishes chemical equations from mathematical equations.
the speed of sound is greater through a solid than through a gas because the molecules in a solid are
A. still
B. vibrating
C. farther apart
D. closer together
Can anyone pls answerrrrt
Answer:
wdym
Explanation:
hmm
what is the Conversion of products into reactants
Answer:
In a chemical reaction, substances (elements and/or compounds) called reactants are changed into other substances (compounds and/or elements) called products. You can't change one element into another in a chemical reaction — that happens in nuclear reactions.
Explanation:
Explanation:
Thus, reactions in which products can be converted to reactant is called Reversible reaction.
Which of the following are needed for an electrical circuit? Choose all that apply
A.A mental conductor for electrons to pass through
B.light bulb
C.two negative ends to a battery
D.closed loop
E.charged battery to provide an electrical difference
Answer:
E\charged battery to provide electronic difference
1. What is the Speed equation?
a. S= D/T
c. A= Fv-lv/T
b. A= lv - FIT
d. S= T/D
Answer:
A
Explanation:
distance over time is speed's equation
How do i find a ionic formula?
for example Ca2+ & S2-
Example #1 write the chemical formula for Calcium Oxide
Step 1
-Find the Atomic symbol of the metal and non-metal on the periodic table
CaO
Step 2
Find the charges for Calcium and Oxygen
which are Ca 2+ and O 2-
Step 3
Balance out the charges
They are already balanced out
Here´s the chemical formula for Calcium Oxide
CaO
Example 2 write the chemical formula for Aluminum Oxide
Step 1
-Find the Atomic symbol of the metal and non-metal on the periodic table
A
l
O
Step 2
Find the charges for Aluminum and Oxygen
Which are Al 3+ and O 2-
Step 3
Balance out the charges
You need 2 Aluminum and 3 Oxygen to balance the charges
Al 3+ O 2-
Al 3+ O 2-
= 6 + O 2-
= 6-
Step 4
If you need more then one element to balance out the charges you identify that by using subscripts
Heres your chemical formula for Aluminum Oxide
[tex]Al_{2} O_{3}[/tex]
How much does the universe(galaxy) weigh?
Answer: Universe
Mass of ordinary matter
The mass of the observable universe is often quoted as 1050 tonnes or 1053 kg. In this context, mass refers to ordinary matter and includes the interstellar medium (ISM) and the intergalactic medium (IGM). However, it excludes dark matter and dark energy.
Density (of total energy): 9.9×10−27 kg/m3 ...
Mass (ordinary matter): 1.5×1053 kg
Contents: Ordinary (baryonic) matter (4.9%); D...
Volume: 3.566×1080 m3
Explanation: Galaxy
around 1.5 trillion solar masses
Their answer: The galaxy weighs around 1.5 trillion solar masses. This number helps put in perspective how very small we are. Take, for instance, where stars in the Milky Way fit in.
Identify the following element: a metal, 2 valence electrons, +2 oxidation number, valence electrons are in period 4.
Answer:
Calcium
Explanation:
I just checked the periodic table! This is right checked twice, I hope this helped first time answering a question. Good luck!
Si echamos en un vaso agua y sal el ¿huevo flotaria ? por que
The DEA has designated five chemicals often found in spice as _____ controlled substances, making it illegal to sell, buy, or possess these chemicals.
Answer:
I'm pretty sure this doesn't really connect with chemistry much but the answer should be Schedule 1 as stated by the Drug enforcement agency.
Which of the following is true for the percentage yield of a reaction?
А. It is the combined yield from the excess reactant and the limiting reactant.
B. It is the calculated yield of the product based on stoichiometry alone.
C. It is calculated based on stoichiometry as well as experimentation.
D. It is the yield of the product from the limiting reactant alone.
Answer:
It is always less than the theoretical yield
Explanation:
For many chemical reactions, the actual yield is usually less than the theoretical yield. This is due to possible loss in the process or inefficiency of the chemical reaction.
Ethanol (C2H5OH) reacts with oxygen gas in a combustion reaction. How many liters of carbon dioxide gas are produced at STP when 375 mL of a 75.0% ethanol solution by mass with a density of 1.22 g/mL reacts with excess oxygen?
The volume of carbon dioxide produced when 375 mL of a 75.0% ethanol solution by mass with a density of 1.22 g/mL reacts with excess oxygen is 667.52 L.
We are told in the question that the solution contains 75.0% ethanol solution by mass.
Hence;
Density of solution = mass/volume
mass = Density × volume = 1.22 g/mL × 375 mL = 457.5 g
Mass% = mass of solute/ mass of solution × 100
Mass of solute = x
Mass of solution = 457.5 g
Mass percent = 75.0%
Substituting values;
75 = x/457.5 + x × 100
75/100 = x/457.5 + x
0.75(457.5 + x) = x
343.125 + 0.75x = x
343.125 = x - 0.75x
x = 343.125/0.25
x = 1372.5 g
The equation of the reaction is;
C2H6O(l) + 3O2(g) → 2CO2(g) + 3H2O(l)
Number of moles of ethanol = 1372.5 g/46 g/mol = 29.8 moles
From the reaction equation;
2 moles of ethanol produces 2 moles of carbon dioxide
29.8 moles of ethanol also produces 29.8 moles of carbon dioxide
If 1 mole of carbon dioxide occupies 22.4 L
29.8 moles of carbon dioxide occupies 29.8 moles × 22.4 L/ 1 mole
= 667.52 L
Learn more: https://brainly.com/question/17638582
1. How many centimeters are in 13.4 inches?
34.036 Thats how many
Answer:
34.036
Explanation:
There are 2.54 centimeters in one inch so you multiply 13.4 and 2.54 to get 34.036.
1. Explain the difference between genetic, environmental, social, and pathogenic factors.
2. How do pathogens spread?
3. How can we, as humans, prevent transmission of pathogens?
4. List three ways the environment can affect personal health.
Answer:They can be spread through skin contact, bodily fluids, airborne particles, contact with feces, and touching a surface touched by an infected person.
Immunise against infectious diseases.
Wash and dry your hands regularly and well.
Stay at home if you are sick.
Cover coughs and sneezes.
Clean surfaces regularly.
Ventilate your home.
Prepare food safely.
Practise safe sex.
Explanation:
1) Which of the following is true about Earth’s plates?
a. Earth’s plates are separated by oceans.
b. Earth’s plates are piled on top of one another within the Earth.
c. Earth’s plates fit closely together with the edges of the plates touching each other.
d. Earth’s plates are surrounded by melted rock and do not touch each other.
Answer:
a because the others whould cause earthquakes
Explanation:
Answer:
A
Explanation:
because i think is A (if is not im sorry )
What is the mass of 3.2 L of water in centigrams?
How many neutrons are in K-37?
Answer:
is this physics
pls check your questions and try again
How many particles would be found in a 12.7 g sample of ammonium carbonate? Show workkk
Answer:
7.8286×10²¹ particles
Explanation:
give me brainlist please
Elements that are usually dull, brittle and do not conduct electricity are know as______.
Points: 46
Answer:
nonmetal
Explanation:
.........
...
.
mixing calcium chlorine with water is a chemical or physical change?
Answer:
Physical Change
Explanation:
4. Initially, 1 mol of oxygen (assumed to be an ideal gas) has temperature 310 K and volume 12 L. We will allow it to expand to volume 19 L. (a) What would be the final temperature if the gas expands adiabatically
Answer:
490.83 oK
Explanation:
First of all, we better agree on the meaning of the word adiabatically. It means without the loss or gain of heat. So nothing is given up to or taken from the environment.
This also assumes that no change has occurred in the pressure.
T1 = 310 oK
T2 = ?
V1 = 12 L
V2 = 19 L
T1/V1 = T2/V2
310 / 12 = x/19 Multiply both sides by 19
310*19 / 12 = T2 Multiply 310 * 19 on the left.
5890 / 12 = T2 Divide by 12
490.83 = T2
The____ is the basic unit of life
Answer:
cell
Explanation:
Cells are the most simple, basic units of life
Answer:
the CELL is the basic unit of life.
Explanation:
I had this is my science lesson
have a great day!
hope this helps!
feel free to mark as brainliest! ;)
Plzzzzz helpppppp meeeee I am dooo confused
Answer:
I think the person is not move
Explanation:
b/c the net force is zero............. 100 w + 100 E
............... 100+(-100 = 0