Answer:
By week 12, the placenta is formed and ready to take over nourishment for the baby. However, it continues to grow throughout your pregnancy. It's considered mature by 34 weeks.
Explanation:
Which statement about the layers would they identify as correct?
The
which are represented by a single uppercase letter, or represented by an uppercase letter followed
by a lowercase letter. This tells you the types of elements in the compound.
Answer:
Elements
Explanation:
The elements which are represented by a single uppercase letter, or represented by an uppercase letter followed by a lowercase letter. This tells you the types of elements in the compound.
Elements are one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means. They are made up of small indivisible particles called atoms, all having the same number of protons.
What is the factor that changes the reaction rate in the following example and why:
Wine sours more slowly when stored in closed bottles.
Answer:
The factor is called a "catalyst." The wine sours more slowly when stored in closed bottles because there's no "oxygen" inside the bottle that could lead to an increase rate of decomposition.
Explanation:
Wines are naturally stored with a cork. The cork prevents oxygen from entering into the bottle. As you probably know, wines have natural bacteria which play a role in the process of fermentation. Once bacteria are introduced to oxygen, they multiply. However, in the process of fermentation, there's no oxygen present. So, once the bottle of wine is opened, it should be consumed immediately because exposing it to air will change its flavors.
A "catalyst" is a factor that affects reaction rates. Their presence hastens the time for decomposition.
Atomic number is equal to the number of electrons in an atom?.
Answer:
true I think not sure
Explanation:
Is it reasonable to expect that the atom model will change again in time?
emergency help ASAP Help me fill out the box please help I’ll mark you as brainlister
Answer:
based on the table, element Q participate in ionic bonding because both potassium and sodium transfers its electrons to element Q, forming ions that attract each other.
how many water molecules are in a block of ice containing 0.750 mol of water (H2O)
Answer:
1.51
⋅
10
24
Explanation:
This is a pretty straightforward example of how to sue Avogadro's number to figure out the number of molecules present in a given sample.
In your case, the sample is said to contain
2.50
moles of water. Now, a mole is simply a very, very large collection of molecules. In order to have
1
mole of a molecular compound you need your sample to contain
6.022
⋅
10
23
molecules of that compound.
plz give my a brainylist
The water molecules are in a block of ice containing 0.750 mole of water. The number of water molecule is 4.52 x 10²³molecules.
What are molecules?Molecules are defined as a group of two or more atoms that together create the lowest recognizable unit into which a pure material can be separated while retaining its makeup and chemical qualities.
It can also be defined as a group of two or more atoms held together by attractive forces called as chemical bonds.
There are mainly three types of molecule.
Molecules of an atomMolecules of an compoundMolecules of an element1 mole of water molecules = 6.022 x 10²³ molecules
So, 0.750 mole of molecules = 6.022 x 10²³ x 0.750
= 4.52 x 10²³ molecules
Thus, the water molecules are in a block of ice containing 0.750 mole of water. The number of water molecule is 4.52 x 10²³molecules.
To learn more about molecule, refer to the link below:
https://brainly.com/question/19922822
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How is the nuclear structure of an atom similar to the non-nuclear structure?
Answer:
It has shells of protons and neutrons.
Explanation:
The nuclear structure of an atom is similar to the non-nuclear structure because has shells of protons and neutrons.
What is an atom?An atom consists of a central nucleus that is usually surrounded by one or more electrons.
The total number of neutrons plus protons in the same both before and after the nuclear process, although the total number of protons and the total number of neutrons may be different before and after.
Hence, the nuclear structure of an atom is similar to the non-nuclear structure because has shells of protons and neutrons.
Learn more about the atoms here:
https://brainly.com/question/1566330
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Which option is an example of a chemical property?
A. boiling point
B. ability to react with oxygen
C. color
D. density
Answer:
boiling point
Explanation:
Option B
When 150. g zinc sulfide are burned in excess oxygen, 68.5 g of zinc oxide are actually produced, along with sulfur dioxide. Determine the percent yield of zinc oxide after finding the theoretical production of zinc oxide.
**Show the balanced equation before you begin.**
%yield = 54.6%
Further explanationPercent yield is the compare of the amount of product obtained from a reaction with the amount you calculated
(theoretical)
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
Reaction
2ZnS+3O₂ ⇒ 2ZnO+2SO₂
MW ZnS = 97.474 g/mol
mol ZnS[tex]\tt \dfrac{150}{97.474}=1.54[/tex]
MW ZnO = 81.38 g/mol
mol ZnO (from mol ZnS as limiting reactant, O₂ excess)[tex]\tt \dfrac{2}{2}\times 1.54=1.54[/tex]
Actual ZnO produced[tex]\tt 1.54\times 81.38=125.33~g[/tex]
Theoretical production = 125.388
%yield[tex]\tt \dfrac{68.5}{125.33}\times 100\%=\boxed{\bold{54.6\%}}[/tex]
Forms of Energy
There are 2 categories of energy, kinetic and potential.
Answer:
okay whats the question
Explanation:
Yes you are correct. There are 2 categories of energy, kinetic and potential.
Which energy transformation occurs after a skydiver reaches terminal velocity?
O Gravitational potential energy transforms into thermal energy.
O Gravitational potential energy transforms into kinetic energy.
O Kinetic energy transforms into thermal energy.
O Kinetic energy transforms into gravitational potential energy.
Answer::
*Gravitational potential energy transforms into thermal energy.*
O Gravitational potential energy transforms into kinetic energy.
O Gravitational potential energy transforms into thermal energy.
When a skydiver jumps out of a plane, the following energy transfers take place: the skydiver's gravitational potential energy decreases as his altitude decreases and his kinetic energy store increases as his speed increases.When a skydiver jumps out of a plane, the following energy transfers take place: the skydiver's kinetic energy store increases as their speed increases. the thermal store of the air and the skydiver increases, as there is friction between the skydiver and the air particles.In this case, both options A and B are correct.
Learn more:
brainly.com/question/12337396
40 g of CaCO3 is how many moles of CaCO3?
10 moles
0.4 moles
40 moles
100 moles
Answer:
0.4 moles
Explanation:
To convert between moles and grams you need the molar mass of the compound. The molar mass of of CaCO3 is 100.09g/mol. You use that as the unit converter.
40gCaCO3* 1mol CaCO3/100.09gCaCO3 = 0.399640 mol CaCO3
This rounds to 0.4 moles CaCO3
lol someone help me with this
Answer:
Its saying how many electronics are in your house.
Explanation:
Such as a tablet or a tv.etc
The electron configuration of an element is 1s^ 2 2s^ 2 2p^ 2 How many valence electrons does the clement have? (1 point )
Answer:
:)
Explanation:
PE = mgh, solve for m
Answer:
P.E. = mgh, where m is the mass in kilograms,
Answer:
[tex]m = \frac{PE}{gh} [/tex]
Explanation:
[tex]if \: PE = mgh \\ then \to \\ m = \frac{PE}{gh} [/tex]
♨Rage♨
How many moles of gold, a U, are in 3.60×10^-5 G of gold?
Answer:
See Below.
Explanation:
This is a conversion problem:
Using the molar mass of Gold (given in a periodic table) which is 196.97g/mol
you have
[tex](3.60*10^-5 g) *\frac{1moles}{196.97g}[/tex]
you always arrange the equation in a way to cancel whatever you don't want (grams) and leave what you do want (moles). Here grams cancel (top and bottom), so you're left with:
[tex]\frac{(3.60*10^-5 g) *(1)}{196.97} = 1.83*10^-7[/tex] moles of Gold
How do you figure out what roman numeral to use? Give a specific example
Answer:Explanation:
The Roman numeral must have the same value as the charge of the ion. In our example, the transition metal ion Fe2+ would have the name iron(II). Add the name of the anion to the transition metal ion. In our example, FeCl2 would have the name iron(II) chloride since the anion is Cl-, which has the name chloride.
which of these is an element?
KBr
O2
2KCl
FeO2
Answer:
02
Explanation:
all the other options given are compounds
Two students are working together to build two models. Both models will represent the molecular structure of sodium bicarbonate, NaHCO3 commonly known as baking soda. The students are using toothpicks to represent bonds and jelly beans to represent atoms. Red jellybeans represent sodium atoms, white jellybeans represent hydrogen atoms, black jellybeans represent carbon atoms, and blue jelly beans represent sodium atoms, white jellybeans represent hydrogen atoms, like jellybeans our cruise and carbon atoms, and we jellybeans that is an oxygen atoms.
Identify the number of each jelly bean needed to make both models.
Answer:
Altogether for both models; two red jellybeans, two white jellybeans, two black jellybeans and six blue jellybeans.
Note: Since no specific color was stated for oxygen atoms, the answer assigns blue colored jellybeans to represent oxygen atoms.J
Explanation:
Sodium bicarbonate, NaHCO₃ is a compound composed of one atom of sodium, one atom of hydrogen, one atom of carbon and three atoms of oxygen.
Since red jellybeans represent sodium atoms, white jellybeans represent hydrogen atoms, black jellybeans represent carbon atoms and blue jellybeans represent oxygen atoms, each of the two students will require the following number of each jellybean for their model of sodium carbonate: One red jellybean, one white jellybean, one black jellybean and three blue jellybeans.
Altogether for both models; two red jellybeans, two white jellybeans, two black jellybeans and six blue jellybeans.
Ionic compounds tend to be ...
A. Hard
B. Soft
C. Bendable
Answer:
A
Explanation:
Answer:
A. Hard
Explanation: got it correct on Edg
What is the chemical name for Cu(NO3)2
Answer:
The chemical name is Copper(II) nitrate
Explanation:
The process of ionic bonding is not the same as the process of metallic bonding. Which of the following statements is true
about these processes?
1. In ionic bonding, only ions of the same element combine to form a compound.
2. In metallic bonding, valence electrons can move freely between atoms.
3. Substances formed through ionic bonding are not considered compounds.
4. In metallic bonding, electrons are transferred between elements in fixed ratios.
Answer: In metallic bonding, valence electrons can move freely between atoms
Explanation:
when metals bond to one another, their outermost energy levels overlap. this allows valence electrons to move freely between atoms in what is sometimes called a “sea of electrons
How many miles are there in 12327 feet
Explanation:
2.3346591 miles is in 12327 feet
Answer:
2.3346591Explanation:
Always remember, to convert
feet to miles, all you have to do is
divide the length by 5280 and then
you will get this much miles: 2.3346591
Hope this helps! <3
How many electrons does each lithium atom provide to the voltaic cell?
A. 1
B. 2
C. 3
D. 4
Answer:
c. 3 electrons
Explanation: for the element of LITHIUM, you already know that the atomic number tells you the number of electrons. That means there are 3 electrons in a lithium atom.
1pt The picture shows the moving molecules in a beaker containing a liquid. What will happen if the molecules increase their speed? A. The liquid will change into a solid. B. The temperature of the liquid will rise. C. The temperature of the liquid will fall. D. The molecules wil gain mass. her is the picture
Answer:
B. The temperature of the liquid will rise.
Explanation:
As the molecules present in the beaker will increase their speed that will result in rise in the temperature of the liquid.
This is so because as the movement or motion of molecules increases, atoms vibrate faster, and its collision with each other and with the wall of the beaker increases that causes a rise in the temperature of the liquid. If the molecules move slowly then the temperature will fall down.
Hence, the correct answer is "B. The temperature of the liquid will rise.".
What type of heat transfer happens in the Inner Core?
Answer: Conduction
Explanation:
Does changing the number of neutrons change the identity of the element you have built ?
Answer:
If you change the number of neutrons somehow, nothing will happen because it carry's no charge at all.
Explanation:
Karina strikes a match to light a candle
Answer:
A burning match represents an exothermic reaction. The chemicals release energy in the form of heat and light as the reaction progresses.
Explanation:
Sample Response
What part of the plant absorbs the most sunlight to use for making glucose?
Question 6 options:
a.Roots
b.Stem
c.Seed
d.Leaves
