Answer: Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light.
Explanation: In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.
An empty beaker and watch glass has a mass of 120.15g. Exactly 25.00 mL of an unknown liquid was added to this beaker and the mass was found. The mass of the beaker, liquid, and cover was 145.50g. What is the density of the liquid?
Answer:
1.014g/mL
Explanation:
Given parameters:
Mass of beaker and watch glass = 120.15g
Volume of unknown liquid = 25mL
Mass of beaker + liquid + cover = 145.50g
Unknown:
Density of the liquid = ?
Solution:
Density is the mass per unit volume of a substance.
It is mathematically expressed as:
Density = [tex]\frac{mass}{volume}[/tex]
Mass of liquid = Mass of beaker + liquid + cover - Mass of beaker and watch glass
Mass of liquid = 145.50g - 120.15g = 25.35g
So;
Density = [tex]\frac{25.35}{25}[/tex] = 1.014g/mL
which statement best describes the result of meiosis?
A. it produces body cells
B. It causes alleles to deform.
C.It prevents genetic mutation
D. it produces reproductive cells.
HELP PLZ ITS DUE SOON!!
Anyone Know the equations?
Iron
iron (III) chlorate solid decomposes into iron (III) chloride solid and oxygen gas equation
Answer:
2Fe(ClO₃)₃ → 2FeCl₃ + 9O₂
Explanation:
To solve this problem, we need to first identify the reactants and products in this problem.
The reactant is iron (III) chlorate
product is iron (III) chloride and oxygen gas
So the chemical formula:
iron (III) chlorate = Fe(ClO₃)₃
iron (III) chloride = FeCl₃
oxygen gas = O₂
Therefore:
Fe(ClO₃)₃ → FeCl₃ + O₂
We need to balance this expression:
2Fe(ClO₃)₃ → 2FeCl₃ + 9O₂
Groundwater makes up most of the water on the planet True or false
Answer:
true
Explanation:
How many moles are in the following atoms? 2.75 x 1025 of tungsten
Answer:
Explanation:
the amount of a substance that contains 6.02 x 1023 respective particles of that substance
I actually dont know the answer but this is the most help I can offer.
this is a clue
Apply Why does a box on the seat of a car
slide around on the seat when the car speeds
up, slows down, or turns a corner
Answer:
im confused on what you mean
Explanation:
Need help with 6th grade science homework PLZ HELP ASAP
Answer:
whaa is it
Explanation:
Answer:
There's nothing. What do you need help with?
Explanation:
Budeme stát na lodi s plachtou, na klidné hladině bez větru a někoho napadne foukat velkým větrákem do plachet lodi.
Answer:
english?
Explanation:
The corn crop in an area is prone to infestation by larvae from moths that feed on the cornstalks and ears of corn. The techniques used by two farmers to protect the corn crop are described below.
Technique A: Sprayed his corn crop with an insecticide. The insecticide is known to kill all honeybee, butterfly, and moth larvae.
Technique B: Used a genetically modified variety of corn. The plant produces an insecticide which selectively kills only the moth larvae as it feeds on the corn.
Which technique is likely to have less of an impact on the environment?
Technique B because it preserves the harmless insects and targets only the moth larvae
Technique A because insecticide use is better for preserving the environment
Technique B because it may help humans who consume corn to fight bacA genetically engineered corn plant is approved for agricultural use.
Technique A because it kills a broader variety of insects to protect the corn
Answer:
a
Explanation:
how does a swamp act as a natural water treatment plant which humans should preserve
if you have 5235 pennies how many grams would they weigh
Which two types of chemical reactions do not always occur? What, specifically, do you need to do to see if they occur or not
Answer:
Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation. A collision that meets these two criteria, and that results in a chemical reaction, is known as a successful collision or an effective collision.
How many moles are in 170 grams of H2O2?
O 0.284 mol H202
O 0.385 mol H202
O 0.500 mol H2O2
O 0.730 mol H2O2
Please help!!!
5.0 mol H₂O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
170 g H₂O₂
Step 2: Identify Conversions
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O₂ - 2(1.01) + 2(16.00) = 34.02 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 170 \ g \ H_2O_2(\frac{1 \ mol \ H_2O_2}{34.02 \ g \ H_2O_2})[/tex]Divide: [tex]\displaystyle 4.99706 \ mol \ H_2O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
4.99706 mol H₂O₂ ≈ 5.0 mol H₂O₂
Answer:
C
Explanation:
PLLLLLLLLLLLLLLLLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ HELPPPPPPPPPP MEEEEEEEEEEE
THXXX
Answer:
Option C: Na2C2O4 + Pb(NO3)_2 = PbC2O4 + 2NaNO3
Explanation:
Na2C2O4 + Pb(NO3)_2
For it to be a double placement reaction, the cations and a ions will switch places in the product.
Now, on this reaction side;
Cations are; Na+ and Pb+
Anions are; C2O4^(-) and (NO3)^(-)
The product side will yield;
Na2C2O4 + Pb(NO3)_2 = 2NaNO3 + PbC2O4
To convert from mass of A to moles of B in a stoichiometry problem, the following steps are followed:
Select one:
a. mass A → moles A → mass B → moles B
b. mass A → moles A → moles B
c. mass A → mass B → moles B
d. mass A → moles A → mass B → moles B
e. mass A → moles B
Answer:
b. mass A → moles A → moles B
Explanation:
hope this helps
To convert from mass of A to moles of B in a stoichiometry problem the steps required is mass A → moles A → moles B.
What is the relation between moles & mass?Relation between moles (n) and mass will be represented by showing the below formula:
n = W/M, where
W = given mass
M = molar mass
So the calculate the moles of B from the stoichiometry of the reaction:
First we convert mass of A into molesThen moles of B will be measured by using the moles of AHence the required steps are mass A → moles A → moles B.
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The least active of the following five elements in the Halogen Family is
a. 53I
b. 9F
c. 85At
d. 35Br
e. 17Cl
Answer:
c
Explanation:
Answer:
C. c c. ccccccccccc
Explanation:
cccccccccc
What is the molecular formula of S2N if it was simplified by a factor of 2?
The molecular formula : = S₄N₂
Further explanationGiven
The emprirical formula : S₂N
Required
The molecular formula
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
A factor of 2⇒n=2
(S₂N)₂=molecular formula
= S₄N₂
What is the true ratio of atoms in a molecule or formula unit called?
O the molecular formula
o the molar mass
O the percent composition
the empirical formula
Mark this and return
Save and Exit
Nel
Submit
Answer:
O the molecular formula
Explanation:
The true ratio of atoms in a molecule or formula unit is called the molecular formula.
The molecular formula of a compound shows the true number of atoms that are combining to form a compound.
For example, the molecular formula of water is H₂O.
Empirical formula of a compound is its simplest ratio. When the number of atoms are divided by the smallest possible factor, it yields the empirical formula.What’s the answer? Lol
Answer:
its in your- your- it- your- ITS IN YOUR IMAGINATIONNNNNNNNNNNNNNNNNNNNNN
Explanation:
Answer:evaporates.
Explanation:Due to this absorption of energy the hydrogen bonds connecting water molecules to one another will break. The molecules are now in the gaseous state; this is called water vapour. The phase change from liquid to vapour is called evaporation. During evaporation a molecule of water absorbs latent heat.
Tuliskan persamaan tetapan kesetimbangan untuk reaksi-reaksi berikut a. Fe3+(aq) + SCN– (aq) ↔ FeSCN3+(aq) b. 3Fe(s) + 4H2O(g) ↔ Fe3O4(s) + 4H2(g)
Answer:
a. [tex]K_c = \dfrac{[ FeSCN^{3+}_{(aq)}] }{[Fe^{3+}_{(aq)}] [SCN^-_{(aq)}]}[/tex]
b. [tex]K_p = \dfrac{[H_2]^4}{[H_2O]^4}[/tex]
Explanation:
Untuk semua jenis reaksi umum:
[tex]aA + bB\iff cC + dD[/tex]
Konstanta kesetimbangan [tex]K_c = \dfrac{[C]^c [D]^d}{[A]^a[B]^b}[/tex]
Dari pertanyaan yang diberikan:
a. [tex]Fe3^+_{(aq)} + SCN^-_{ (aq)} \iff FeSCN^{3+}_{(aq) }[/tex]
Konstanta kesetimbangan:
[tex]K_c = \dfrac{[ FeSCN^{3+}_{(aq)}] }{[Fe^{3+}_{(aq)}] [SCN^-_{(aq)}]}[/tex]
b. [tex]3Fe_{(s)} + 4H_2O_{(g)} \iff Fe_3O_4_{(s)} + 4H_{2(g)}[/tex]
Konstanta kesetimbangan untuk tekanan parsial [tex]K_p[/tex]
[tex]K_p = \dfrac{[H_2]^4}{[H_2O]^4}[/tex]
Karena Fe3O4 (s) hadir sebagai padatan.
Determine the number of atoms in 3.54 mol Mn.
2.13x10²⁴ atoms are the number of atoms in 3.54 mol of Mn. The atom serves as the fundamental unit of chemistry.
What is atom?The smallest unit of matter that may be divided without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The rest is made up of a cloud of electrons with negative charges surrounding a positive charge nucleus made up of protons and neutrons.
Number of atom = number of mole × 6.022×10²³
Number of atom = 3.54 × 6.022×10²³
= 2.13x10²⁴ atoms
Therefore, 2.13x10²⁴ atoms are the number of atoms in 3.54 mol of Mn.
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Choose the correct definition of the word DEPOSITION?*
Deposition is the process of liquid falling from the sky as precipitation.
Deposition is the process that breaks down rock and other substances at Earth's
surface.
Deposition is the process that transports rock and other substances on the Earth's
surface.
Deposition is the process that drops or lays down rock and other substances at
Earth's surface
Answer:
D
Explanation:
A quick way of remembering the process of deposition, think about the word deposit. Deposit is a prefix of deposition and generally is defined as dropping or putting/setting things down. Using this clue, you can guess that deposition has something to do with putting dropping / putting something down.
The only answer that clearly mentions the process of dropping or laying down something is D, so D is the correct answer.
Also, deposition is literally defined as the depositing of rocks.
A train travels 200 km/hr. How much distance will the train be from the station in 2.5 hours?
Answer:
500
Explanation:
200 multiplied by 2.5
Answer:
500 km
Explanation:
2x200 is 400. 0.5 of 200 is 100, 400+100=500
What is this please explain
What is the percent Nitrogen in Mg(NO2)2?
3. List three structures found in
plant cells that are not in ani-
mal cells. (7.1.b)
What two elements are used to make a laser pen light?
Answer:
Helium and Neon
Explanation:
Semiconductor diodes are the current elements of laser pointers and are formed by a mixture of Gallium and Arsenic with very small amounts of other elements to obtain different wavelengths.
Laser pointers or pen light are inputs that emit collimated and colored laser radiation, which every day finds more applications in industry, ordinary life and research.
The first pointers were made with Helium and Neon but they were delicate and bulky, today they have been replaced by pointers with solid state diodes, depending on the material they can emit radiation from 1320 nm to 254 nm.
The most common materials for economically priced pointers that emit in the visible range (400 nm to 700 nm) are Gallium and Arsenic, in the GaAs semiconductor compound with 1.4 eV energy gap.
For the emission, a np union is created and depending on the doping, emission is achieved in a wide range of wavelengths.
In conclusion, semiconductor diodes are the current elements of laser pointers and are formed by a mixture of Gallium and Arsenic with very small amounts of other elements to obtain different wavelengths.
Fundamental materials: Gallium and Arsenic
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What is this and please explain why it is :)
Answer:
it's A
Explanation:
It's a because you started with electricity as your source of energy and the new turn it into magnetical energy
A cell is a system of parts that work together to carry out basic life processes. An animal is also a system of parts that work together to carry out basic life processes. Match each organ or organ system with the cell part that has a similar function.
Answer: the cell wall is the skeletal system
The nucleus is the brain
The mitochondria is the digestive system
The cell membrane is the skin
Explanation:
