Answer:
Rubbing the match against a rough surface
The activation energy is provided by friction between surfaces
Explanation:
Activation energy is the energy required to start a chemical reaction. It is the minimum energy that must be supplied for a reaction to proceed.
When we strike a match against a rough surface, what we are trying to do is to supply the required activation energy in the form of friction in order to get the combustion reaction started.
Hence, the activation energy for the combustion of a match head is supplied by friction when the match head is struck against a rough surface.
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Answer:
its b alkyne
Explanation:
brinliest po plsss
Answer:
Alkyne so its b
What is the balanced equation for the reaction of a solution of sodium sulfate is mixed with strontium chloride?
Answer:
NaSO⁴(ads) ,ganadicate
If there were 11.25 moles of solute in a 6.0M solution, what volume would it have?
Answer:
1.875 dm^3
Explanation:
M = moles of solute ÷ volume of solution
M =11.25 x 6
= 1.875 dm^3
2L is the correct answer .
HOW TO CALCULATE ??
Given : moles of solute(n) = 11.25Molarity (M) = 6
To Find : Volume of the solution (v) = ?Key concept : [tex]M=\frac{n}{V(inL)}[/tex]On puting values and solving we get , V = 1.875 L ≈ 2L
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Balance the following chemical equation. Choose the correct coefficients in the balanced equation in order. *
4, 3, 2
2, 4, 2
1, 1, 1
3, 2, 3
Answer: 4,3,2
Explanation:
is sodium potassium nitrate exo or endo?
endothermic
Explanation:
I believe it's an endothermic but I'm not all too sure
Answer:
Pottasium nitrate is highly exothermic!However the dissolution of sodium nitrate in water is endothermic. Heat is absorbed during process.
Remember, the graph in question 1 is a cooling curve. A substance is
changing from a gas to a liquid to a solid. Which model illustrates the
final phase change in this cooling curve?
A) Image A
B) Image B
C) Image C
D) Image D
What two forces act in the nucleus to create a 'nuclear tug-of-war'?
a.
Covalent bond, ionic bond
c.
Van der waals force, dipole
b.
Electrostatic repulsion, strong nuclear force
d.
All of the above
Answer:
Electrostatic repulsion, strong nuclear force
Explanation:
The nucleus consists of protons and neutrons. protons are positively charged while neutrons possess no charge.
Since protons are positively charged, they repel each other strongly (like charges repel). This strong repulsion of like charges makes the nucleus somewhat unstable leading to spontaneous fission of heavy nuclei.
However, an opposing force called nuclear attractive force tends to hold the nucleons together. This attraction occurs when two nucleons are bonded by a particle called a π meson.
Hence, the two forces that act in the nucleus to create a 'nuclear tug-of-war' are electrostatic repulsion and a strong nuclear force.
Which processes involve nuclear changes?
A. fission and fusion
B. erosion and weathering
C. combustion and oxidation
D. evaporation and condensation
Answer:
Nuclear processes, including fusion, fission, and radioactive decays of unstable nuclei, involve changes in nuclear binding energies.
Explanation:
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How many grams of sodium chloride could be produced from 41.3 L of chlorine gas?
Answer:
The grams of sodium chloride that will be made is 292.5 g. calculation. 2Na + Cl₂ → 2NaCl. step 1: calculate the moles of Na. moles = mass/molar mass. From periodic table the molar mass of Na = 23 g/mol. moles = 115 g/23 g / mol = 5 moles. Step 2 : use the mole ratio to determine the moles of NaCl. Na:NaCl is 2:2 = 1:1 therefore the moles of NaCl is also = 5 moles.
Explanation:
We know sodium is a very active metal and chlorine is also a very reactive non-metal. Usually, metals like to eliminate electrons and non-metals such as halogens like to accept electrons. Sodium readily eliminate its last shell electrons become Na+ cation and chlorine accepts that electron to form Cl-anion.
Which tool was most likely used in a procedure if the lab report shows that 300 mL of water was used?
O a volumetric flask
O a thermometer
a pipette
O a graduated cylinder
how many moles of HCI will react with 18.13g of SrO
Answer:
Explanation:
The balanced chemical equation between
SrO + 2HCl → H2O + SrCl2
Explain the process of fermentation.
Answer:
Fermentation, chemical process by which molecules such as glucose are broken down anaerobically. More broadly, fermentation is the foaming that occurs during the manufacture of wine and beer, a process at least 10,000 years old. The frothing results from the evolution of carbon dioxide gas, though this was not recognized until the 17th century.
Explanation:
looked it up-
Answer:
like babies or milk and cheese?
Explanation:
In a closed chamber, 58 grams of propane gas and 220 grams of oxygen gas are sparked to initiate the combustion reaction shown below. C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(l) What is the limiting reagent in this reaction?
propane
oxygen
water
carbon dioxide
Answer:
C) Propane
Explanation:
It's literally all I know
A jar is filled to the top with water, and a piece of cardboard is slid over the opening so that there is only water in the . If the jar is now turned over, will the cardboard fall off? What will happen if there is any air in the jar?
Answer:
it will all fall unless these is air
Explanation:
Answer:
If you do it carefully enough, a small amount of water will pour out of the glass — that's supposed to happen. But try not to let any air bubbles get into the glass. Finally, slowly remove the hand holding the cardboard in place.
In the lab you take 50.0 mL of a 40.0 M NaOH solution and then add water to it until it reaches the 500.0 mL mark of the flask. What is the concentration of the new solution?
Answer:
4.00M NaOH
Explanation:
A 50-ml amount of 40.0M NaOH contains
(40.0 mol NaOH/1 L)×(0.0500L) = 2.00 mol NaOH
Adding enough water to make a 500.0 mL NaOH solution, the new concentration of this solution is
2.00 mol NaOH/0.5000 L = 4.00M NaOH
How does increasing temperature affects reaction rate?
what are radioactive tracers used for
Answer:
Radioactive tracers are widely used to diagnose industrial reactors, for instance by measuring the flow rate of liquids, gases and solids.
Explanation:
Radioactive tracers are widely used to diagnose industrial reactors, for instance by measuring the flow rate of liquids, gases and solids. A radioactive tracer is a chemical compound in which one or more atoms have been replaced by a radioisotope.
heres the link for more information
https://www.iaea.org/topics/radiotracers#:~:text=Radioactive%20tracers%20are%20widely%20used,been%20replaced%20by%20a%20radioisotope
.
How much heat do you need to raise the temperature of 300 g of ethanol from 0°C to 20°C?
Answer:
14.6
Explanation:
I just took the test
The amount of heat to raise the temperature is 14.7J.
How do you calculate the heat needed to raise the temperature?The specific heat capacity of a substance is the quantity of heat needed to raise the temperature of a unit quantity of the substance by one degree. Calling the amount of heat added Q, which will cause a change in temperature ∆T to a weight of substance W, at a specific heat of material Cp, then Q = w x Cp x ∆T
By applying the formula, we get
Q = w x Cp x ∆T
Q = 300 * 2.46 * 20/1000
Q = 14.760J
What is heat?
Heat is energy that is transferred from one body to another as the result of a difference in temperature.
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what type of reaction takes place when bromine reacts with iron iodide
Answer:
If you pass bromine vapour over hot iron, a similar but slightly less vigorous reaction happens, this time producing iron(III) bromide. Anhydrous iron(III) bromide is usually produced as a reddish-brown solid. Again the iron has been oxidised to an oxidation state of +3.
Explanation:
The knowledge produced by science builds on old ideas and is constantly changing.
State whether you agree or disagree with this statement considering what you have learned about the scientific process.
⚠️⚠️What is kinetic energy ? ⚠️⚠️
Energy of work
Energy of movement
Energy of gravity
Energy of power
⚠️⚠️PLEASE HELP IM BEING TIMED⚠️⚠️⚠️
Answer:
Energy of Movement.
Explanation:
Have a great day!
Use the drop-down menus to rank the boiling points of the following hydrocarbons. Use a "1" to indicate
the compound with the lowest boiling point.
Answer:
1. 4
2. 2
3. 3
4. 1
Explanation: just did it on edge 2021
Answer:
one.) 4
two.) 2
three.) 3
four.) 1
What is the function of these organelles?
Answer:
Endoplasmic reticulum, Golgi apparatus, Nucleus, Storage Organelles, and Energy - Producing Organelles.
Explanation:
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Oxygen has 6 valence electrons. how many hydrogen atoms (who have 1 valence electrons) can bond with it? remember the octet rule.
Answer:
two hydrogen can bonded with oxygen to form H2O
Which of the following statements are true about elements and compounds?
A. Elements are made up of compounds.
B. Compounds are made up of elements
C. Elements can be shown with chemical symbols, but compounds cannot.
D. Elements and compounds are the same thing.
Answer:
the answer is b
hope this helps :)
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calculate the mass of 0.8 moles of Fe(NO3)3 (H2O)9
Answer:
Molar mass of (Fe(NO3)3)(H2O)9 is 403.9972 g/mole
Explanation:
the formula to find the mass of moles
Worked Example: molar mass = mass ÷ moles (M=m/n) Calculate the molar mass of a pure substance if 1.75 moles of the substance has a mass of 29.79 g.
i think it help you
How many moles of hypomanganous acid. H3 MnO4, are contained in 22.912 g?
Answer:
0.188mol
Explanation:
Using the formula;
mole = mass/molar mass
Molar mass of hypomanganous acid. (H3MnO4) = 1(3) + 55 + 16(4)
= 3 + 55 + 64
= 122g/mol
According to this question, there are 22.912g of H3MnO4
mole = 22.912g ÷ 122g/mol
mole = 0.188mol
2. Calculate the boiling point of a 1.7 m ethylene glycol solution.
Hydrogen and oxygen combining to form water is an example of a physical change.
what happens during a physical change?
A. New substances are formed
B. The identity of the substance is changed
C. A chemical reaction occurs
D. A substance may look different, but has not changed its identity.
Answer:
D
Explanation:
Hope this helped!