Answer:
Bari oxit được tạo nên từ các nguyên tố Bari (Ba) và Oxi (O)
Explanation:
What is considered a pure substance?
Answer:
A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
Explanation:
Compound: A substance that contains more than one element
pure substance: is made up of one substance made up of only one type of molecule
A sturdy plant is placed in an airtight, transparent container. The entire experiment is then weighed. For 10 days, the plant grows inside the container. After 10 days, the container is weighed again. The air inside the container is pumped out and carefully analyzed.
What is true about the air inside the container and the mass of the experiment?
-The air is richer in carbon dioxide. The mass of the experiment has not changed
-The air is richer in oxygen. The mass of the experiment has changed.
-The air is richer in carbon dioxide. The mass of the experiment has changed.
-The air is richer in oxygen. The mass of the experiment has not changed.
Answer:
hi
Explanation:
bye
A gas has a pressure of 1.51 atm and occupies a volume of 8 L. If the gas is compressed to a volume of 1.12 L, what will its pressure be, assuming constant temperature? Answer in units of atm.
Answer:
[tex]\boxed {\boxed {\sf 10.8 \ atm}}[/tex]
Explanation:
We are asked to find the new pressure of a gas after a change in volume. Since the temperature remains constant, we are only concerned with pressure and volume.
We will use Boyle's Law, which states that the volume and pressure of a gas are inversely proportional. The formula for this law is:
[tex]P_1V_1=P_2V_2[/tex]
The gas has an original pressure of 1.51 atmospheres and a volume of 8 liters.
[tex](1.51 \ atm)(8 \ L)=P_2V_2[/tex]
The volume is compressed to 1.12 liters and the new pressure is unknown.
[tex](1.51 \ atm)(8 \ L)=P_2 (1.12 \ L)[/tex]
We are solving for the new pressure, so we must isolate the variable [tex]P_2[/tex]. It is being multiplied by 1.12 liters. The inverse operation of multiplication is division. Divide both sides of the equation by 1.12 L.
[tex]\frac {(1.51 \ atm)(8 \ L)}{1.12 \ L}= \frac{P_2(1.12 \ L)}{1.12 \ L}[/tex]
[tex]\frac {(1.51 \ atm)(8 \ L)}{1.12 \ L}= P_2[/tex]
The units of liters (L) cancel.
[tex]\frac {(1.51 \ atm)(8 )}{1.12}= P_2[/tex]
Multiply the numerator.
[tex]\frac {12.08 \ atm}{1.12}= P_2[/tex]
[tex]10.7857143 \ atm = P_2[/tex]
Round to the nearest tenth. The 8 in the hundredth place tells us to round the 7 in the tenth place up to an 8.
[tex]10.8 \ atm \approx P_2[/tex]
The new pressure after the volume is compressed is approximately 10.8 atmospheres.
ain the energy transformation that occurs when a hair dryer is plugged in and turned on.
Group of answer choices
Chemical energy transforms into electrical and sound energy.
Electrical energy transforms into mechanical and thermal energy.
Mechanical energy transforms into chemical and electrical energy.
Thermal energy transforms into electrical and gravitational energy.
Answer:
Mechanical
Explanation:
Since, this mechanical energy gets converted into thermal energy due to which hairs get dry. Thus, we can conclude that the energy transformation that occurs when a hair dryer is plugged in and turned on is that electrical energy transforms into mechanical and thermal energy.
24.) In humans animals and plants the DNA is found in the?
Answer:
chromosome
Explanation:
Answer:
Most of the DNA in all animals, humans, and plants is found in the cell nucleus. Humans, animals and plants contains both DNA and RNA in the cell nucleus and they have to be present in all because every organisms structure and function directly depends upon them.
Explanation:
Put the sets of 3 elements in order from least metallic character to most metallic character. Help please!!
Answer:
29:Mn,V,Sr
30:Ni,Pd,Cs
31:Cr, Mo, W
32:Sn,Pb,Ti
33:F, P, As
Sorry I was in a rush so it may not be right; so check with this picture to help you out.
What’s solubility need it for science
Answer:
the ability of a compound to dissolve
Explanation:
salt dissolves in water so it would be soluble.
oil does not dissolve in water so it is not soluble
How does the concentration of ions in a strong acid differ from a weak acid?
Answer:
A strong base has a much smaller concentration of positive ions (hydrogen ions) and a much greater concentration of negative ions (hydroxide ions). The weak base has a much greater concentration of positive ions (hydrogen ions) and a much smaller concentration of negative ions ( hydroxide ions) = answer !!
Explanation:
What do all the molecules in the table have in common?
Answer:
They all consist of the same amount of protons, electrons, and neutrons in an element.
Explanation:
For example in water (H20) contains 1 atom of protons, 1 atom of electrons and 1 atom of neutrons.
Scientists must use microscopes to study the cells of living things. Microscopes have become much more powerful since scientists used them to develop the cell theory. Explain why microscopes are needed to study cells. Also describe some discoveries that microscopes have helped scientists make about cells. Include how advances in microscopes have helped scientists make these discoveries.
Answer:
Because most cells are too small to be seen by naked eye.
Microscopes allowed scientists to observe Prokaryotic cells which make up Bacteria and Archaea. These cells are small and contain no membrane- bound organelles. It allowed them to observe Eukaryotic cells with a nucleus and membrane-bound organelles that perform different life functions.
Answer:
Microscopes are necessary to study cells because cells are microscopic. Because a cell is the smallest unit of life, this means that they can’t be seen by the naked eye. But using a microscope allows scientists to zoom in and see all parts of a cell. Therefore, scientists must use microscopes to study cells. Microscopes have helped us discover new things like bacteria, diseases, new species, and to study fossils. As microscopes improve we can see smaller and smaller cells.
Hope this helps!✌️
Which of the following is the equation for wave speed?
Answer:
[tex]{ \boxed{ \mathfrak{ \: answer : \: { \bf{v = f \lambda}} }}}[/tex]
v is the wave speedf is frequencylambda is wave lengthwhat happens to the atoms during a chemical reaction
Answer:
Atoms get rearranged and make up different molecules. No atoms are created nor destroyed.
Explanation:
Explain why sodium loses one electron and chlorine gains one electron in three or more sentences.
Answer:
Sodium and chloride form an ionic bond. Therefore the sodium atom loses one electron from its outer shell and the chlorine atom gains one electron. As this happens, the electron is transferred from the sodium atom to the chloride atom and so both atoms become ionic and have a full outer shell.
Explain why it’s important in determining the geometry of a molecule to know about both bonds AND lone pairs on the central atom?
Answer:
Using the VSEPR theory, the electron bond pairs and lone pairs on the center atom will help us predict the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize attraction.
Explanation:
this from the internet
sorry if im wrong
The lone pairs and bond pairs in a molecule are used to determine the location of electron pair geometry around the molecule.
What is electron pair geometry?The geometry of a molecule refers to the shape of the molecule. The geometry of a molecule is determined by the valence shell electron pair repulsion theory.
Now, we know that both lone pairs and bond pairs in the molecule are used to determine the electron domain geometry around the central atom as they take the most appropriate orientations in space to minimize electron pair repulsions.
Learn kore about electron pair geometry: https://brainly.com/question/365923
During region C of the graph above the energy being absorbed is a. increasing the velocity of the water particles. b. increasing the distance between the water particles and reducing their phase energy. c. increasing the distance between the water particles and increasing their phase energy. d. decreasing the velocity of the water particles.
Answer:
Your answer would be B. Increasing the distance between the water molecules and increasing their phase energy.
Explanation:
Hope this helps you answer this question!
Can someone give me Two methods for monitoring and minimizing a human impact on the environment?
Heavy rains fill a reservoir, causing the dam that holds the water to break. As a result, the areas downstream are suddenly flooded. Which question would a
scientist seek to answer?
A. What will be the long-term effect of the flood on the plants and
animals in the area?
B. Who was responsible for the design flaw in the dam?
C. What changes in regulations are needed to prevent future dam
failures?
D. How much money should be spent to ensure dam safety?
Which description is an example of the effects of rising temperatures?
Can someone help with this pls!!
Answer:
2
Explanation:
good vibes
You have been given four substances that are all white
solids at room temperature. List three specific tests that
you could perform to figure out whether they are ionic or
molecular compounds.
Ionic compounds have a high melting point while molecular compounds have a low melting point.
If I have a white solid, this solid may be ionic or molecular. Ionic substances dissolve in water while molecular substances do not dissolve in water. This is the first test.
Secondly, an ionic solid has a high melting point while a molecular solid has a low melting point. Again, ionic substances are crystalline when felt while molecular compounds are non crystalline when felt.
Learn more: https://brainly.com/question/11324711
Explain why the number 1,085 is NOT a perfect square
1085 is a perfect square if the square root of 1085 equals a whole number. The square root of 1085 is not a whole number. 1085 is not a perfect square root.
Do you want to play again?
A student compares a sample of isooctane with some petrol. the student found that the isooctane boiled at 99°C while the petrol boiled between 45 and 95°C. which of these is a puse Substance? Explain ur answer.
Answer:
The isooctane
Explanation:
A pure substance is, according to Wikipedia, "a chemical substance is a form of matter having constant chemical composition and characteristic properties." That's a lot of words, but we just need to focus on some of them: "constant... characteristic properties." The properties of a pure substance always stay the same, no matter what.
The boiling point of a substance is one of its properties. It looks like the petrol boils at different points, between 45 and 95°C. The isooctane, on the other hand, boils consistently at 99°C. So, we can infer that the isooctane is the pure substance.
Hopefully that was helpful! If you need more questions answered, let me know. :)
In a compound, chemical energy is _______________ when bonds break.
a
absorbed
b
released
c
both A and B
d
neither A or B
ion has a valency of 3 write down the molecular formula of
tetraoxosulphafe,
trioxosulphate,
trioxocarbonate,
hydroxide,
chloride, and
oxide
for oxide it is X2O3
for chloride it is XCl3
Explanation:
just exchange the valency with the radical
NEED HELP!PLEAE WITH CHEMISTRY!
3. both covalent and ionic
EXPLANATION
Sodium Phosphate is an ionic compound formed by two ions, Sodium Na+ and Phosphate PO−3 . In order for these two polyatomic ions to bond the charges must be equal and opposite. Therefore, it will take three +1 sodium ions to balance the one -3 phosphate ion. However, polyatomic ions are held together by covalent bonds, so this compound contains both ionic and covalent bonds.
need help w this question
Answer:
ok you got it you just need to add.
Explanation:
add 5 times and she what you get.
An object experiences a net force to the right that gives it an acceleration of 2.0 m/s2. If the net force is doubled then the new acceleration of the object will be ???
Answer:
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
The force on an object is given by the equation F= ma. In this equation, Fis
the force, mis the mass, and a is the acceleration. What is the force on an
object that has a mass of 540 kg and an acceleration of 2.3 m/s2?
Answer:
[tex]\boxed {\boxed {\sf 1, 242 \ N}}[/tex]
Explanation:
According to Newton's Second Law of Motion, force is the product of mass and acceleration.
[tex]F=ma[/tex]
In this formula, F is the force, m is the mass, and a is the acceleration.
The mass of the object is 540 kilograms and the acceleration is 2.3 meters per second squared.
m= 540 kg a= 2.3 m/s²Substitute the values into the formula.
[tex]F=(540 \ kg)(2.3 \ m/s^2)[/tex]
Multiply.
[tex]F=1242 \ kg*m/s^2[/tex]
Conver the units. 1 kilogram meter per second squared is equal to 1 Newton. Therefore, our answer of 1242 kilogram meters per second square is equal to 1242 Newtons.
[tex]F= 1242 \ N[/tex]
The force of the object is 1242 Newtons.
An atom's Lewis dot structure has three dots. Which of the following elements could it be, and why? (4 points)
Group of answer choices
Aluminum, because it is in group 13 and has three valence electrons.
Lithium, because it is a group 1 element with three total electrons.
Magnesium, because it is in period 3 and has three valence electrons.
Potassium, because it is an alkali metal and has three inner shell electrons.
Answer : The correct option is, Magnesium because it is a group 2 element with two valence electrons.
Explanation :
Element = Calcium
Atomic number = 20
Electronic configuration of Ca =
Number of valence electrons in Ca = 2
The number of inner shell electrons in Ca = 18
This option is wrong because lewis-dot structure shows only valence electrons not inner shell electrons.
Element = Carbon
Atomic number = 6
Electronic configuration of C =
Number of valence electrons in C = 4
This option is wrong because only outermost p-sublevel electrons are not showing in lewis-dot structure.
Element = Lithium
Atomic number = 3
Electronic configuration of Li =
Number of valence electrons in Li = 1
This option is wrong because it has only 1 electron in outermost shell.
Element = Magnesium
Atomic number = 12
Electronic configuration of Ma =
Number of valence electrons in Ma = 3
This option is correct.
Lewis-dot structure : It is defined as the structure in which valence electrons of the atom is shown as dots.
ANOTHER EXPLANATION:
Answer: C. Magnesium, because it is a group 2 element with two valence electrons.
An atom's Lewis dot structure has two dots. Which of the following elements could it be, and why?
A. Calcium, because it is an alkaline earth metal with two inner shell electrons.
B. Carbon, because it has two electrons in its outermost p sublevel.
C. Lithium, because it is a group 1 element with two bonding electrons.
D. Magnesium, because it is a group 2 element with two valence electrons.
Explanation:
If you were to look at the periodic table magnesium would be in group 2. Since magnesium is in group 2 therefore it will have two valence electrons. Calcium is another possible answer because it is also in group two, but for this quiz it is incorrect. Lithium is incorrect because it is in group 1 and therefore it would only have 1 valence electron. Carbon is also incorrect because it is in group 14 so it would have 4 valence electrons. Hope this helps and makes sense.
Good Luck!!
Have a great day Studying!
The Lewis dot structure of an atom has three dots. With three valence electrons and belonging to group 13, which of the following elements may it be?
Are the elements of group 13 metals?The semi-metal boron (B) and the metals aluminum (Al), gallium (Ga), indium (In), and thallium (In) are all members of the boron family (Tl). The periodic table's fifth element, boron (Z=5), is found in Group 13. It is categorized as a metalloid because of its characteristics, which combine those of metals and nonmetals.
What traits does group 13 exhibit?The Periodic Table of Elements places these elements in Group 13 (XIII) of the p block. Metallic elements include thallium, gallium, indium, and aluminum. In their outermost shells, they each have three electrons shell with the valence electron configuration ns2np1 (one electron in the p orbital and a complete s orbital).
To know more about Lewis structure, visit-https://brainly.com/question/4144781
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.
Formula for Gold (I) Nitride
Answer:
Gold(I) Nitride Au3N Molecular Weight -- EndMemo
