Answer:Physical changes occur when matter changes its chemical property but not its nature. Water turning into ice is an example of a physical change. Baking soda powder reacting to vinegar is an example of a chemical change Remember! Physical change: Properties remain the same are____physichal_________________ . ______ ___________substances are formed. List 5 signs of chemical change: List 5 examples of physical change: ______________________ ______________________
Explanation:
i tried to answer the most because of my proofile page it seems like i am in high school but i am iin 6th grade
https://www.liveworksheets.com/fu1187118lo
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
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.
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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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
Region where electrons are located within an atom, what is it??
Answer:
Electron shells surrounding the nucleus.
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
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.
Learn more about chemical equation,here:
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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.
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.
8. How is the cell wall different from the cell membrane?
O The cell wall is only in plant cells
The cell wall is in animal and plant cells
The cell membrane provides protection
All cells only have a cell membrane
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
How many atoms of potassium make up 2 moles?
Answer:
1.2044 × 10²⁴
Explanation:
1 mol = 6.022 × 10²³
2 mol = 2 × 6.022
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.
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×ATHow 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
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
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.
To learn about ideal gas law, refer the link below:
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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.
!!!!!!
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
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
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:
Calculate the number of moles of MgBra in 500 mL of a 0.80 M solution.
O 4.0 mol
O 0.040 mol
O 40 mol
O 0.40 mol
Answer:
0.40mol
Explanation:
M = n/V
n= VM
500mL is 0.5L
n = (0.5)(0.80)
n = 0.40mol
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 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:
True or false: A compound containing one or more oxygen atoms is not necessarily capable of forming hydrogen bonds between its molecules.
Answer:
false
Explanation:
I think it would help you out
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)
how many hydrophobic tails does a triacyl glycerol molecule have?
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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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
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
