Hannah wants to make some toast for breakfast, but she has 3 minutes before she has to leave for school.
She knows toasting bread is a chemical change so what is the best way for Hannah to increase the rate of this chemical change?
Answers
Answer: increase the temperature of the toaster oven.
Explanation:
Related Questions
How many moles at of a gas will occupy 2.5 L at STP?
We need to answer the question with steps of that method.
Answers
Explanation:
Volume of gas = 2.50 L
Temperature = 273 K
Pressure = 1 atm
Moles of gas = ?
Solution:
PV = nRT
n = PV/RT
n = 1 atm× 2.50 L / 0.0821 atm. L. K⁻¹.mol⁻¹ . 273 K
n = 2.5 atm. L /22.4 atm. L. mol⁻¹
n = 0.112 mol
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Chemical reactions occur around us every day. Combustion of hydrocarbons releases the carbon stored in fossil fuels (e.g. coal, oil, natural gases) into the atmosphere as carbon dioxide gas. Which of the following equations represent this process?
Answers
Answer:D
Explanation:
Among all the given options, option A is correct option that is C[tex]_4[/tex]H[tex]_{10}[/tex] + O[tex]_2[/tex] →CO[tex]_2[/tex] + H[tex]_2[/tex]O. Combustion of hydrocarbons releases the carbon stored in fossil fuels into the atmosphere as carbon dioxide gas.
What is Chemical reactions?Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
Chemical reactions are indeed a fundamental component of life itself, as well as technology and culture. Burning fuels, melting iron, creating glass as well as pottery, brewing beer, producing wine, and making cheese are just a few examples of ancient processes that involved chemical reactions. C[tex]_4[/tex]H[tex]_{10}[/tex] + O[tex]_2[/tex] →CO[tex]_2[/tex] + H[tex]_2[/tex]O represent Combustion reactions.
Therefore, the correct option is option A.
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what are three applications of the
coal
Answers
Three uses of coal:
1. Electricity generation
2. Steel production
3. Cement manufacturing and as a liquid fuel
Hope it helps!
How many moles are in 2.4x10^25 atoms?
Answers
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is "mol." This site uses an exact value of 6.0221415 x 10 23 for Avogadro's number. This is the number of atoms in 1 mole of a chemical element.
Hope I helped :)
Help please the question is in the picture
Answers
Answer:
A and D.
Explanation:
A shows that people continued to use more and more fossil fuels until around the middle of the time period where the cost of certain fossil fuels doubled. This helps show that less people were willing to pay this price and would start looking for other means of fuel. This leeads to D.
As people looked for other fuel sources renewable energy uses reached a high in 2012 which was after the cost of certain fuels had doubled.
Why does Gaseous planets have the most moons
Answers
Answer:
In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons. As these planets grew in the early solar system, they were able to capture smaller objects with their large gravitational fields.
Explanation:
Answer:In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons. As these planets grew in the early solar system, they were able to capture smaller objects with their large gravitational fields. *Moons of planets and dwarf planets.
Explanation: .
Help me pls thank youuu
Answers
Answer:
Answer is endothermic.
Explanation:
I hope it's helpful!
Which statements would be expected to be true for Organesson? Select all that apply.
Answers
Answer:It has the lowest effective nuclear charge of the four new elements.
The electronic configuration of the Organesson element is [Rn]5f¹⁴6d¹⁰7s²7p⁶ so it has fully filled valence shell. As the last element in the periodic table, it has the largest atomic radius and the lowest effective nuclear charge. Therefore, option (C), (D), and (E) is correct.
What is an electronic configuration?The electron configuration gives information on how electrons are distributed in different energy levels of an atom of an element. In the electron configuration of an element, the number of electrons can be written as a superscript of electron-containing atomic subshells. For example, the electron configuration of magnesium is written as 1s²2s²2p⁶3s².
The principal quantum number (n) in electron configuration decides the maximum number of electrons that can fill in an electron shell. It is calculated from the formula 2n², where ‘n’ is the principal quantum number of the shell.
The atomic orbitals at lower energy must be fully filled before occupying an orbital at higher energy.
The atomic number of the Organesson element is 118 and the electronic configuration is [Rn]5f¹⁴6d¹⁰7s²7p⁶. Therefore, the valence shell of Organesson is fully filled. As the last element in the periodic table, it has the largest atomic radius and the lowest effective nuclear charge.
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Your question is incomplete, but most probably the complete question was,
Which statements would be expected to be true for Organesson (Og)? Select all that apply.
A. It is relatively unreactive.
B. It has a high electron affinity.
C. It has a full valence shell of electrons.
D. It has the largest atomic radius of the four new elements.
E. It has the lowest effective nuclear charge of the four new elements.
Convert 125m^3 to km^3
Answers
Answer:
1.25e-7
Explanation:
PLEASE HELP WILL MARK AS BRAINIEST
Answers
Answer:
for 1st question the answer is maybe 4th or 1st ( I think 4th ).
and for the 2nd question 4th ( consumers ) option is the answer
and the answer of third question is omnivores.
Answer:
1) The transfer or flow of energy.
2)Consumers
3)Omnivores
May it help you
Plz help u might find it easy
Answers
The melting point of pure lead : 327 °C
Further explanationGiven
Amount of tin and melting point of solder
Required
The melting point
Solution
The composition of solder = tin and lead
So if it is 100% tin, 0% lead or 0% tin, 100% lead
From the table it is shown that when the position is 100% tin in the solder, the melting point of the solder is 232 °C, so it shows that the melting point of pure lead is obtained when% tin in solder = 0 (100% lead in solder), so that the melting point is obtained. : 327 °C
Why is it that elements combine to form compounds?
Answers
Answer:
Explanation:
Almost all the elements combine to form compounds, although the reactivity may vary from element to element. These combinations take place because almost all the elements are unstable. ... By gaining or losing electrons, ionic compounds are produced. Sharing of electrons results in the formation of covalent compounds
How is the attraction between molecules of a solid and a gas different?m
Answers
Answer:
Q1) solids are strong, gasses are weak
Explanation:
Solids are Tightly packed molecule with no gap or space in between.Gasses are loosely packed and move freely in our atmosphere.Examples of solids are Wood, steel, plastic etcExample of gasses are oxygen, Carbon dioxide, nitrogenPlease mark me as brainliest
Thank you :-)
Answer:
Solids are strong, gases are weak
Explanation:
The attraction between molecules of a solid and gas are different in that those of solids are strong and gases are very weak.
The intermolecular attraction in gases are the weakest of the three states of matter. For the solid, they present the strongest attraction.
The intermolecular attraction is very important for characterizing the nature of the physical changes matter undergoes. Solids requires a great deal of energy to cause physical changes to them. Gases do not require too much energy. The distances between gas molecules is very great compared to the closeness of the solid molecules.
Calculate the amount of moles in 1.17 x 1016 molecules of H2S.
Answers
Answer:
[tex]\boxed {\boxed {\sf About \ 1.94 *10^{-8} \ mol \ H_2S}}[/tex]
Explanation:
To convert from molecules to moles, Avogadro's Number must be used.
6.022* 10²³This number tells us how many particles (atoms, ions, molecules, etc.) are in 1 mole of a substance. For this problem, it is moles of hydrogen sulfide.
6.022*10²³ molecules of hydrogen sulfide in 1 mole.We can use the number as a fraction.
[tex]\frac { 6.022 *10^{23} \ molecules \ H_2S}{1 \ mol \ H_2S}[/tex]
Multiply by the given number of molecules.
[tex]1.17*10^{16} \ molecules \ H_2S *\frac { 6.022 *10^{23} \ molecules \ H_2S}{1 \ mol \ H_2S}[/tex]
Flip the fraction so the molecules of hydrogen sulfide will cancel out.
[tex]1.17*10^{16} \ molecules \ H_2S *\frac {1 \ mol \ H_2S }{ 6.022 *10^{23} \ molecules \ H_2S}[/tex]
[tex]1.17*10^{16} *\frac {1 \ mol \ H_2S }{ 6.022 *10^{23} }[/tex]
[tex]\frac {1.17*10^{16} \ mol \ H_2S }{ 6.022 *10^{23} }[/tex]
[tex]1.94287612*10^{-8} \ mol \ H_2S[/tex]
The original measurement of molecules had 3 significant figures so we must round our answer to that.
For the number we calculated, that is the hundredth place. The 2 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]1.94 *10^{-8} \ mol \ H_2S[/tex]
There are about 1.94*10⁻⁸ molecules of hydrogen sulfide.
12. The letters C, AI, and Au are examples of
a. molecules
b. formulas
c. compounds
d. symbols
Answers
Answer:
d. Symbols.
Explanation:
Symbols are the abbreviations used to represent a particular thing. Similarly, chemical symbols are representative of the elements they denote based on their names.
The letters C stands for Carbon, Al for Aluminum, and Au for Gold. While it is easy to figure out the letters/ symbols and elements from the words that are their names, gold's symbol "Au" comes from the word "Aurum" which means yellow.
Thus, the above-given letters are examples of symbols.
23g of of sodium reacted with 35.5g of chlorine. calculate the mass of the sodium chloride compound formed
Answers
Answer:
the answer is 58.5g
Explanation:
23+35.5=58.5g
1. In detail and in your own words, describe the motion of each of the following objects in the solar system. Remember to write in complete sentences. Draw a sketch that shows how each object moves around the sun. You may draw your sketches by hand or you may use the Paint program on your computer. (15 points each)
a. The planets (include 2 ways planets move)
b. Moons (include 2 ways moons move)
c. Comets (What is the shape of their orbit? Around what object do they orbit?)
d. Asteroids (Where do they orbit? Around what object do they orbit?)
2. In your own words, explain each of the following measures. Include estimations that compare these units of measurement to distances you are more familiar with, such as miles or kilometers. (You do not need to include a measurement for light year. Just make sure you explain in detail what a light year is.) (15 points each)
a. Astronomical Unit (AU) (Include a specific number and a unit.)
b. Light Year
c. Speed of Light (Include a specific number and unit.)
3. List the planets in our solar system in order from closest to the sun to furthest away from the sun. Make sure you have this information memorized. (15 points)
4. In your own words, name and describe the force that keeps the planets orbiting around the sun, moons orbiting around planets, etc. What TWO factors affect the strength of this force? (15 points)
5. How does distance from the sun affect a planet's orbit period? How does distance from the sun affect a planet's orbit velocity? (10 points)
6. Planets A and B are orbiting around the sun. Planet A has a longer orbit period than planet B. Which planet is closer to the sun? (10 points)
7. Planets C and D are orbiting around the sun. Planet C has a slower orbit velocity than planet D. Which planet is closer to the sun? (10 points)
WORTH 100 POINTS
Answers
2.A:Astronomical Unit.a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.
B:Light Year.A unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).
C:The Speed of Light.The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792458 metres per second.
3.In order of distance from the sun they are; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto, which until recently was considered to be the farthest planet, is now classified as a dwarf planet.
4.Gravity is the primary force that controls the orbit of the planets around the sun. While each planet has its own gravity based on the size of the planet and the speed at which it travels, orbit is based on the gravity of the sun.
5.A planet farther from the Sun not only has a longer path than a closer planet, but it also travels slower, since the Sun's gravitational pull on it is weaker. Therefore, the larger a planet's orbit, the longer the planet takes to complete it.
6.If Planet A has a longer orbital period then Plant B. Then that means Plant B is closer to the sun.
7.If Planet C has a slower orbit velocity then according to Kepler's law Planet D is closer to the sun. This is because the further it is from the sun, the weaker the gravitational pull, which means the orbit is slower.
what is empirical formula for CLO2
Answers
Answer:
chlorine dioxide is empirical formula for CLO2.
What do ALL states of matter have in common?
Answers
Answer:
The common thing among the three states of matter is - They are made up of small tiny particles. They have a particular mass and can occupy space . This three states have volume in it . The atoms of this three states have force of attractions between them .
Explanation:
hope this helps <3
PLZ help me !! ASAP!!!
Answers
Answer:
3.2g of NaOH
Explanation:
NaOH
Na = 22.989
0 = 16
H = 1
=39.989
40cm³ - 0.04dm
80g × 0.04dm = 3.2g of NaOH
hope this is correct!
Mass is a type of property that can be measured using a scale. Is mass considered a physical property or a chemical property? How do you know? It’s not a multiple choice
Answers
Answer:
Mass is an extensive physical property, it depends on the amount of matter being measured. It is physical because it can be measured without changing a substance's chemical identity.
Which of the following digits are not considered significant in a number? Select all that apply.
non-zero digits
zeros that occur to the right of non-zero digits
zeros that occur to the left of non-zero digits
zeros that fall between non-zero digits
Answers
Answer:
The answer is only: C, zeros that occur to the left of non-zero digits
Explanation:
What amount of ammonia, NH3(g), can be produced from 15 mol of hydrogen reacting with excess nitrogen?
3 H2(g) + N2(g) → 2NH3 (g)
Select one:
a. 30 mol
b. 20 mol
c. 10 mol
d. 15 mol
Please answer will give 5 stars
Answers
Is 2H2 + O2=2H2O a balanced equation
Answers
Explanation:
Yes, the equation is balanced. There are the same number of Hydrogen (H) and Oxygen (O) atoms on both sides of the equation.
What is the chemical equation for solutions 1, 2, and 3. What is the Net ionic equations for each solution.
Answers
Answer:
The molecular equation shows each of the substances in the reaction as compounds with physical states written next to the chemical formulas. The
complete ionic equation shows each of the aqueous compounds as separate ions. Insoluble substances are not separated and these have the symbol (s) written
next to them. Water is also not separated and it has a (l) written next to it. Notice that there are ions that are present on both sides of the reaction arrow –>
that is, they do not react. These ions are known as spectator ions and they are eliminated from complete ionic equation by crossing them out. The remaining
equation is known as the net ionic equation. For example: The reaction of potassium chloride and lead II nitrate
Molecular Equation: 2KCl (aq) + Pb(NO3)2 (aq) -> 2KNO3 (aq) + PbCl2 (s)
Complete Ionic Equation: 2K+ (aq) + 2Cl-
(aq) + Pb2+ (aq) + 2NO3–
(aq) -> 2K+
(aq) + 2NO3
–
(aq) + PbCl2 (s)
Net Ionic Equation: 2Cl-
(aq) + Pb2+ (aq) -> PbCl2 (s)
Explanation:
Hope it help yoou mark as BrainlistHow many grams of H2O will be lost as steam if you heat 12.21g of CuSO4 · 4H2O? What is the chemical name of CuSO4 · 4H2O?
Answers
Answer:
3.798g of H₂O
Explanation:
In 1 mole of CuSO₄.4H₂O there are 4 molecules of water. The heat produce the releasing of 4 waters of hydration. To solve this question we need to convert the mass of CuSO₄.4H₂O to moles using its molecular mass (231.67g/mol). The moles of CuSO₄.4H₂O times 4 are the moles of water:
Moles CuSO₄.4H₂O:
12.21g CuSO₄ * (1mol / 231.67g) = 0.0527 moles
Moles H₂O:
0.0527 moles * 4 = 0.2108 moles of water
Mass (Molar mass H₂O = 18.015g/mol):
0.2108 mol * (18.015g / mol) =
3.798g of H₂OSome gas molecules move at speeds of 542 meters per second. How fast is this in miles per hour? 542 =? 1h Solve by dimensional analysis. Treat as exact numbers: 1 mi = 5280 ft 1 in = 2.54 cm
Answers
Answer:
[tex]1212.42\ \text{mph}[/tex]
Explanation:
We need to convert [tex]542\ \text{m/s}[/tex] to [tex]\text{miles/hour}[/tex]
[tex]1\ \text{mile}=5280\ \text{ft}[/tex]
[tex]1\ \text{ft}=12\ \text{inches}[/tex]
[tex]5280\ \text{ft}=5280\times 12=63360\ \text{inches}[/tex]
[tex]1\ \text{inch}=2.54\ \text{cm}=0.0254\ \text{m}[/tex]
[tex]63360\ \text{inches}=63360\times 0.0254=1609.344\ \text{m}[/tex]
So
[tex]1\ \text{mile}=1609.344\ \text{m}\\\Rightarrow 1\ \text{m}=\dfrac{1}{1609.34}\ \text{miles}[/tex]
[tex]1\ \text{hour}=60\times 60\ \text{seconds}\\\Rightarrow 1\ \text{s}=\dfrac{1}{3600}\ \text{hour}[/tex]
[tex]542\ \text{m/s}=\dfrac{\dfrac{542}{1609.34}}{\dfrac{1}{3600}}=1212.42\ \text{mph}[/tex]
The speed of the gas molecules is [tex]1212.42\ \text{mph}[/tex].
How many moles are in 1.42 x 10^25
molecules of NaCl?
Answers
23.6 mol NaCl
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Reading a Periodic TableExplanation:Step 1: Define
1.42 × 10²⁵ molecules NaCl
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 1.42 \cdot 10^{25} \ molecules \ NaCl(\frac{1 \ mol \ NaCl}{6.022 \cdot 10^{23} \ molecules \ NaCl})[/tex]Multiply/Divide: [tex]\displaystyle 23.5802 \ mol \ NaCl[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
23.5802 mol NaCl ≈ 23.6 mol NaCl
pls help will give brainiest
Answers
Answer:
The answer is B
Explanation:
The moon is in-between the sun and the Earth during a new moon.
10 points!! Please answer only if you know the correct answer I’m already failing the class :/
How many moles are represented by 9.34 x 1021 sodium atoms?
a . 1.25 x 10^-2 moles
b. 1.55 x 10^-3 moles
c. 1.55 x 10^-2 moles
d. 1.55 moles
Answers
Answer:
c) 1.55 ×10⁻² moles
Explanation:
Given data:
Number of moles of sodium = ?
Number of atoms = 9.34 ×10²¹ atoms
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
Moles of sodium atoms:
1 mole contain 6.022× 10²³ atoms
9.34 ×10²¹ atoms × 1 mol / 6.022× 10²³ atoms
1.55 ×10⁻² moles
