Answer:
exothermic
Explanation:
take a rubber band between the first two finger of each hand
stretch it, release, stretch is release over and over fast
put the rubber band on you cheek and feel the heat
You RELEASED HEAT, HEAT CAME OUT, HEAT EXITED THE RUBBER
so the process is EXO(EXITS)-THERMIC (HEAT)
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Can anyone please solve it and give me the answer.
Answer:
If your students do an exercise and choose the option "send my answers to the teacher", you can check their answers in your mail box. If the students log in with their username and password and do the exercises in their workbooks, you can check their work in your notifications.
Explanation:
may it helpful for you
How many atoms of potassium make up 2 moles?
Answer:
1.2044 × 10²⁴
Explanation:
1 mol = 6.022 × 10²³
2 mol = 2 × 6.022
What useful functions do oxidation numbers serve?
Explanation:
Oxidation Numbers. It is often useful to follow chemical reactions by looking at changes in the oxidation numbers of the atoms in each compound during the reaction. Oxidation numbers also play an important role in the systematic nomenclature of chemical compounds.
brainliest please
How can a chemical reaction be sped up?Select from the drop-down menu to correctly complete the statement.
Add a ___ that is unaffected by a reaction.
A:Catalyst
B:Coefficient
C:Product
Answer: Catalyst
Explanation: it speeds it up lol but basically the catalyst helps speed up the chemical reaction by reducing the activation energy or changing the reaction machenism/
Answer:
The answer is A. Catalyst
Consider a galvanic cell with a beaker of sulfuric acid and a beaker of nitric acid. The sulfuric acid beaker contains a strip of tin, and the nitric acid cell contains a strip of platinum. A wire runs between the strips. The reaction that occurs is as follows:
3Sn(s) + 2NO3–(aq) + 8H+(aq) → 3Sn2+(aq) + 2NO(g) + 4H2O(l)
In three to five sentences, list which electrode is the anode and which is the cathode and the half reactions that occur at each electrode.
I wrote, The platinum electrode is the cathode in this reaction. The tin electrode is the anode in this reaction. In the half reactions that occur the nitrate is reduced to nitric oxide(NO) while the tin electrode is oxidized to Sn2+.
Oxidation occurs at the tin half cell(anode) while reduction occurs at the nitrate half cell(cathode).
A galvanic cell refers to a cell that produces electrical energy spontaneously by redox reaction. Oxidation occurs at the anode while reduction occurs at the cathode in a galvanic cell.
The oxidation half equation at the anode occurs as follows;
3Sn(s) → 3Sn^2+(aq) + 6e
The reduction half equation that occurs at the cathode is;
2NO3–(aq) + 8H+(aq) + 6e→ 2NO(g) + 4H2O(l)
We can see that electron loss occurs at the cathode while electron gain occurs at the anode as we can see in the equations above.
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3. How many grams of magnesium ion are in 155.0 grams of Mg3P2?
Answer:
83.82 g of magnesium ions.
Explanation:
We want to determine the mass of magnesium ions in 155.0 grams of magnesium phosphide (Mg₃P₂).
We can convert from grams of Mg₃P₂ to moles of Mg₃P₂, moles of Mg₃P₂ to moles of Mg, and moles of Mg to grams of Mg.
Find the molecular weight (molar mass) of magnesium phosphide:
[tex]\displaystyle \begin{aligned}\text{MW}_\text{Mg$_3$P$_2$} &= \left(3(24.31)+2(30.97)\right) \text{ g/mol} \\ \\ &= (72.93 + 61.94) \text{ g/mol} \\ \\ &= 134.87 \text{ g/mol}\end{aligned}[/tex]
The molecular weight of magnesium is 24.31 g/mol*.
From the chemical formula, we can see that there are three moles of magnesium for every one mole of magnesium phosphide.
Hence, multiply initial amount with known ratios:
[tex]\displaystyle \begin{aligned} &155.0 \text{ g Mg$_3$P$_2$} \cdot \frac{1 \text{ mol Mg$_3$P$_2$}}{134.87\text{ g/mol}} \cdot \frac{3\text{ mol [Mg$^{2+}$]}}{1 \text{ mol Mg$_3$P$_2$}}\cdot \frac{24.31 \text{ g [Mg$^{2+}$]}}{1 \text{ mol [Mg$^{2+}$]}}\\ \\ & = 83.82 \text{ g [Mg$^{2+}$]}\end{aligned}[/tex]
In conclusion, there are 83.82 grams of magnesium ions in 155.0 grams of magnesium phosphide.
*Because the magnesium ions in magnesium phosphide have two less electrons, its molecular weight will indeed be lower. However, due to the extremely small size of an electron (1/2000th of a proton), the difference in mass is insignificant.
Which statement is true about electronegativity?
A. Electronegativity generally decreases from left to right across a period.
B. Electronegativity is the ability of an anion to attract another anion.
C. Electronegativity generally is higher for metals than for nonmetals.
D. Electronegativity generally increases as you go from bottom to top in a group.
Answer:
electronegativity generally increase as you go from bottom to top group
Which pair of elements will form an ionic bond? *Use a periodic table: https://ptable.com/?lang=en#Properties
Hint- bond between a metal and nonmetal
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Question 5 options:
carbon (C) and oxygen (O)
barium (Ba) and chlorine (Cl)
carbon (C) and chlorine (Cl)
nitrogen (N) and oxygen (O)
Butene gas C4H8 has a molar mass of 56.1gmol. If it occupies 3000. mL of space at 1000. K and 760. torr, how much butene gas (in grams) is present
Answer:
2.05g
Explanation:
The weight of butane gas present in the system with the specified temperature and pressure is 2.05 g. We can use ideal gas law here.
What is ideal gas law?Ideal gas law states the relation between temperature, pressure and volume and mathematically written as below:
PV = nRT
Here, P and V be the pressure and volume and n be the no.of moles and R be the universal gas constant. T is the absolute temperature in kelvin.
The system have a volume of 3000 mL or 3 L and pressure of 760 torr and temperature of 1000 K. The no. of moles n is the ratio of taken weight to the molar mass. R has the value 62.36 L torr/(K mol)
Apply these values into ideal gas law as given below:
(3 L × 760 torr) = (w/56.1 g/mol) × 62.36 L torr/(K mol) × 1000 K. From this,
[tex]2280 \textup{ torr L} = \frac{w}{56.1 g/mol} \times 62360 \textup{ L torr/mol}[/tex]
[tex]w = \frac{2280\textup{ torr L}\times 56.1\textup{ g/mol}}{62360 \textup{ L torr/mol}} =2.05 g[/tex]
Therefore, the amount of butane gas for the given system is 2.05 g.
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S = AD/AT
Solve for "AD"
Answer:
AD=S×ATExplanation:
the question is solving for AD if s=AD/AT; THEN S/1=AD/AT by cris cross multiplication AD=S×ATRegion where electrons are located within an atom, what is it??
Answer:
Electron shells surrounding the nucleus.
How do you define weight on Earth?
A. the mass of the object plus the mass of Earth
B. the amount of matter in the object sitting on Earth's surface
C. the push or pull that causes the object to move, stop, or change direction
D. the amount of gravitational force between the object and Earth
Answer:
D
Explanation:
Occurs because of pressure differences around the equator.
Answer:
Pressure Differences occur as result of heating differences
Explanation:
Pressure differences usually occur as a result of heating differences ... most heat is contained near the equator, where most of the heating occurs
what are ionic bonds???
ionic bonds is a type of bond that is ionic I will personally explain
Answer: A type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound
Explanation: ;) ur welcome
which event demonstrates electromagnetic waves transferring energy?
A: An explosion causing a window to break
B: An astronaut tapping two rocks together
C: A person diving in a swimming pool
D: sun heating car sitting in a parking lot
real answers please
(not chemistry but science so)
I admit that I'm unsure, but I believe the answer is D: Sun heating car sitting in a parking lot. It makes sense to me, but I'm blonde. I hope it is correct. I also have that question in my quiz.
2. phosphorus
How many valance electrons are in phosphorus
Answer:
5 valance electrons
Explanation:
Phosphorus has 5 valance electrons because it is in the group 15. Phosphorus has 3 rings, 2, 8, and 5. The third ring is not full which means those are the valance electrons.
how many nitrogen atoms should appear on the right side of this equation 2AgNO3+Cu=?
Answer:
One.
Explanation:
Both sides of the equation need 2 Silver atoms, 1 Nitrogen, 3 Oxygen and 1 Copper to be balanced which is the same as the side of reactants.
1. ____ is the measure of the pull of gravity on an object.
2. ____ is the force of attraction between all objects.
3. The forces of gravity depends on the ___ of the objects & how ___ apart they are.
4. ____ can change because the pull of gravity is not the same everywhere.
5. The ____ of and object always remains the same, regardless of the ____
1. weight
2. gravity
3. mass, far(distance)
4. weight
5. mass, ?
How far will you run in 3 minutes if you run at a pace of 4 meters per second?
Answer:
you will run 720 meters
Explanation:
because 4 times 60 is 240 and 240 times 3 is 720
how to find the molar mass of two elements when given the molecular weight of the compound and the percent composition
Answer: To do this, you must divide the mass of each element by its molar mass. Use the periodic table to find the molar mass of each element. Calculate the number of moles of each component element in the compound. A compound is 2.00% H by mass, 32.7% S by mass, and 65.3% O by mass.
Explanation:
!!!!!!
A 68g bar of gold is cut into 3 equal pieces. How does the density of each piece compare to the density of the original gold bar?
Answer:
22.6666666666666666 and so on
Explanation:
68÷3
Answer:
The right answer 22.6666666667
Explanation:
68÷3 the right one
how many hydrophobic tails does a triacyl glycerol molecule have?
i cant nderstand how t write an electron configuration
Answer:
Explanation:
Naming ionic compounds building a triangle so that each edge has the same answers facing each other
Part B
Decide which molecules in the simulation will represent the substances from the actual reaction. Include a strategy to deal with the difference in structure between the actual reaction N2 + 3H2 ⇌ 2NH3 and the simulated reaction. Not all molecules need to be used.
Simulation of a reaction is a chemical reaction modeling or demonstration tool, using various software to better understand the molecular structure and the physical and chemical properties of the molecule. Here the actual reaction is N2 + 3H2 -----> 2NH3. In the simulation reactions, the nitrogen and hydrogen molecules in the actual reaction are described by different colored circles or dots and the bonds are produced using a single, double or triple line that touches each molecule and gives an appearance like the reactants and the products' ball and stick model. Example: Molecule of nitrogen as o---triple line---o. A molecule of hydrogen as O———O. Chemical symbols such as N and H are expressed in Actual Chemical Reaction, N2 and H2 and the bonds are represented by single, double or triple lines that do not impact the atoms in the molecule as follows: Nitrogen Molecule: N -triple Bond- N. Hydrogen Molecule: H - H. Hope it helps ya
In the simulation reactions, the nitrogen and hydrogen molecules in the actual chemical equation are described by different colored circles or dots and the bonds are produced using a single, double or triple line that touches each molecule.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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___AsCl3+____H2S-->___As2S3+___HCI
Answer:
2 AsCl₃ + 3 H₂S → As₂S₃ + 6 HCl
Explanation:
When we balance a chemical equation, what we are trying to do is to achieve the same number of atoms for each element on both sides of the arrow. On the right of the arrow is where we can find the products, while the reactants are found on the left of the arrow.
We usually balance O and H atoms last.
AsCl₃ + H₂S → As₂S₃ +HCl
reactants
As --- 1
Cl --- 3
H --- 2
S --- 1
products
As --- 2
Cl --- 1
H --- 1
S --- 3
2 AsCl₃ + H₂S → As₂S₃ +HCl
reactants
As --- 2
Cl --- 6
H --- 2
S --- 1
products
As --- 2
Cl --- 1
H --- 1
S --- 3
The number of As atoms is now balanced.
2 AsCl₃ + 3 H₂S → As₂S₃ +HCl
reactants
As --- 2
Cl --- 6
H --- 6
S --- 3
products
As --- 2
Cl --- 1
H --- 1
S --- 3
The number of S atoms is now equal on both sides.
2 AsCl₃ + 3 H₂S → As₂S₃ + 6 HCl
reactants
As --- 2
Cl --- 6
H --- 6
S --- 3
products
As --- 2
Cl --- 6
H --- 6
S --- 3
The equation is now balanced.
Please Help (80 Points)
Describe two conditions needed for a molecule to be polar
Answer:
1. The molecule must possess polar covalent bonds in its structure
2. The molecule must have a NET DIPOLE moment
Explanation:
Polar molecules occur when two atoms do not share electrons equally in a covalent bond. A dipole forms, with part of the molecule carrying a slight positive charge and the other part carrying a slight negative charge. This happens when there is a difference between the electronegativity values of each atom.
Polar molecules have an asymmetrical form and polar covalent connections due to atoms' different electronegativities, resulting in an unequal electron density distribution and a net dipole moment.
To determine the polarity of a molecule, two conditions need to be satisfied:
The molecule must have an asymmetrical shape, and its electron density must be irregular. When the atoms that make up the molecule have different electronegativities, the electrons are drawn to one atom in the molecule more than they are drawn to another. Because of this excess electron density, one side of the molecule will become slightly negative (-), while the other side will become slightly positive (+).
Polar Bonds: In order for the molecule to function properly, it must contain polar covalent bonds. When two atoms with differing electronegativities share electrons in an unequal manner, a polar covalent bond is formed. This results in one atom having a partial positive charge and the other atom having a partial negative charge. When a molecule has multiple polar covalent connections and an asymmetrical shape, the dipole moment of the molecule is said to be polar.
Polarity can be attributed to the asymmetrical bent shape of water (H2O) as well as the covalent interactions between hydrogen and oxygen. Due to the fact that oxygen has a greater electronegative potential than hydrogen, electrons are drawn towards oxygen, which results in oxygen atoms having a partial negative charge whereas hydrogen atoms have a partial positive charge.
Because of the varying electronegativity of the atoms, a polar molecule needs to have an asymmetrical structure and polar covalent bonds in order to exist. As a result of these conditions, polar molecules possess an uneven distribution of their electron density as well as a net dipole moment.
To know more about atoms
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A baseball that is moving through the air has ________ energy.
Answer:
Kinetic
Explanation:
Kinetic energy is the energy of motion.
Answer:
kinetic energy because of its motion
If a girl says that she doesn't like you but she gives you her number, does that mean she likes you?
Answer:
she could be lying about liking you or just want to be friends just ask
What part of an investigation is only found in an experimental investigation
Answer:
control group
Explanation:
Answer:
control book
Explanation:
I found it online and it's very helpful
Write a net ionic equation for the formation of calcium oxalate that results when a solution of calcium bromide is mixed with a solution of sodium oxalate.
The net ionic equation is; Ca^2+(aq) + C2O4^2-(aq) -----> CaC2O4(s).
First of all we must write the molecular reaction equation;
CaBr2(aq) + Na2C2O4(aq) -------> CaC2O4(s) + 2NaBr(aq)
Then we write the complete ionic equation as follows;
Ca^2+(aq) + 2Br^-(aq) + 2Na^+(aq) + C2O4^2-(aq) -----> CaC2O4(s) + 2Na^+(aq) + 2Br^-(aq)
We can now write the net ionic equation as follows;
Ca^2+(aq) + C2O4^2-(aq) -----> CaC2O4(s)
The net ionic equation eliminates the spectator ions and only shows the ions that underwent change in the reaction.
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