Answer:
Use of Chemical Symbols
One of the main reasons this was developed was because using letters was the easiest way to represent the elements. Another reason that we use chemical symbols is to allow us to write chemical formulas easily.
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The correct answer is actually
D. requires a lot of energy to become hot.
As the definition of specific heat is "the heat required to raise the temperature of the unit mass of a given substance by a given amount."
What does climate change have to do with chemistry
Answer:
Well there are chemicals in the air like CO2 and nitrogen
Explanation:
These are chemicals and chemists deal with chemicals
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What are examples of physical properties of substance? Select all that apply. A Solubility B Odor C Color D Flammability
Solubility, odor, and color are physical properties; they can all be discerned without having to subject a substance to a chemical change. Flammability, on the other hand, is a chemical property. Thus, choices A, B, and C would be correct examples of physical properties.
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How is a pure sample of cobalt obtained
Where are most algae found?
on the surface of lakes
growing on the ocean bottoms
floating on water world-wide
in forests around the world
Answer:
on the surface of lakes
Explanation:
A bowler lifts her bowling ball a distance of 0.5 meters using 35 joules of energy. If, on Earth, a 1.0 kilogram mass weighs 9.8 newtons, the mass of the bowling ball used by this bowler is about;
Answer:17.5
Explanation: (0.5 meters)(35 Joules) =
When the bowler lifts the bowling ball for a distance of 0.5 m, the mass of the bowling ball used by the bowler is 17.3 kg.
What is Energy?The ability to do work is called Energy.
As work done and energy has the same units. The energy required is equal to the work done.
E = W = 35 J
Force acting on the ball is equal to the weight of the ball.
F = Weight =mg
where m = mass of the bowling ball and g = acceleration due to gravity
Substituting the given energy and distance moved, we have
[tex]35 = m\times9.81\times0.5\\ m=17.3 \:\rm kg[/tex]
Therefore, the mass of the bowling ball is 17.3 kg.
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366 Cal to kilowatt-hours, how to convert?
Answer:
0.000425 kilowatt hour
Give one safety precaution should take during carbon and lead oxide experiment
Answer:
use safety goggles
Explanation:
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How many molecules are in 5.60 L of oxygen gas
Answer:
5.6L of O2 means we have 0.25 moles of O2. and as 1 molecule of O2 has 2 atoms, so, 1.50575*10^23 molecules will have 2*1.50575*10^23 atoms=3.0115*10^23 atoms of O.
I'll give brianliest if correct .
Answer:
the answer is decaying wood
Which of the following is NOT a representative particle?
molecule
atom
electron
Write the information provided by a balanced equation.
Answer:
2 Fe 2O 3 + 3 C → 4 Fe + 3 CO 2
Explanation:
yeap
Which of the following is a property of bases in aqueous solutions?
A. They reacts with metals to produce hydrogen gas.
B. They taste sour.
C. They increase the concentration of H+ ions.
D. They decrease the concentration of H+ ions.
How many molecules of HCl would react with 2 moles of Al?
2Al + 6HCl → 2AlCl3 + 3H2
Answer:
3.612 × 10^24 molecules
Explanation:
The balanced chemical equation in this question is given as;
2Al + 6HCl → 2AlCl3 + 3H2
Based on the equation, 2 moles of Aluminum (Al) is needed to react with 6 moles of HCl
Since 1 mole of a substance is equal to 6.02 × 10^23 molecules;
This means that, according to the question, 6 moles of HCl needed to react with 2 moles of Al will contain;
6 × 6.02 × 10^23 molecules
= 36.12 × 10^23
= 3.612 × 10^24 molecules
In a nutshell, 3.612 × 10^24 molecules of HCl would react with 2 moles of Al.
Answer:
1.806 × 10^24
Explanation:
1. What was the mass of a sample of water if the addition of 4280 joules raised the temperature of the sample from 22.00C to 34.50C?
2. What is the specific heat of a sample of an alloy if 3750 joules of heat are released when a 315 gram sample of alloy cools from 78.00C to 28.40C?
3. The specific heat of iron is 0.448 J/g0C. What will be the final temperature if 35000 joules of heat are added to a 454 gram sample of iron at 24.00C?
4. What will be the final temperature when 8750 joules are added to 75.0 grams of water at 23.00C?
5. When 38800 joules were added to a sample of iron, specific heat 0.448 J/g0C, the temperature rose from 24.5 deg C to 178 deg C. What was the mass of the iron sample?
Explanation:
Number 1
Q = 4280J
mass = x
∆∅ = 34.5 - 22
∆∅ = 12.5°C
Specific heat capacity of water = 4200J
Q = mc∆∅
4280 = x(4200)(12.5)
4280 = 52500x
x = 4280/52500
x = 0.0815kg
Number 2
c = x
Q = 3750
m = 315g
∆∅ = 78 - 28.4
∆∅ = 49.6°C
Q = mc∆∅
3750 = 315×x×49.6
3750 = 15624x
x = 3750/15624
x = 0.2400J(g°C)-¹
Number 3
c = 0.448
Q = 35000
m = 454g
∆∅ = x
Q = mc∆∅
35000 = 454(0.448)(x)
35000 = 203.392x
x = 35000/203.392
x = 172.0815
∅2 - ∅1 = ∆∅
∅2 = ∆∅ + ∅1
∅2 = 172.0815 + 24
∅2 = 196.0815
∅2 = 196°C
Number 4
Q = 8750J
m = 75g = 0.075
c = 4200J/kg/°C
∆∅ = x
Q = mc∆∅
8750 = 0.075(4200)∆∅
8750 = 315×x
x = 8750/315
x = 27.7778
∅2 - ∅1 = 27.7778
∅2 = 27.7778 + ∅1
∅2 = 27.7778 + 23
∅2 = 50.7778
∅2 = 50.8°C
Number 5
Q = 38800J
c = 0.448J/(g°C)
∆∅ = 178 - 24.5
∆∅ = 153.5°C
m = x
Q = mc∆∅
38800 = x × 0.448 × 153.5
38800 = 68.768x
x = 38800/68.768
x = 564.2159
x = 564g
A force of 5000 newtons is applied to a 1200 kg car at rest. What is its acceleration?
Algae and other phytoplankton are the major producers of the earth's:
oxygen
carbon dioxide
hydrogen
nitrogen
Answer:
oxygen
Explanation:
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2) Which of the following statements are true about energy and matter?
The transfer of energy through empty space can be by radiation.
Conduction is heat transfer by direct contact of particles of matter.
Conduction is the transfer of heat by the movement of a heated fluid.
Density is a measure of how much mass there is in a volume of a substance.
The movement of energy from a warmer object to a cooler object is called heat
transfer.
Answer:
the transfer through empty space can be radiation
Explanation:
because when it transfers it turns into radiation
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How is a balanced chemical reaction, like N2 +
3H2 --> 2NH3, similar to a recipe?
Answer: With each input, there is an output, a recipe requires certain ingredients, and certain amounts of each. A recipe calls for measurements, missing something can ruin it, just like a chemical formula, take something out or add something else, you get something completely different. when putting things together to make something you have to make sure what your putting in, will give you the product you want as the output.
Explanation:
Which Lewis electron-dot diagram represents an atom of a Group 13 element in the ground state?
Answer:
sodium chloride and lead (II) acetate
potassium sulfate and strontium iodide
chromium (III) nitrate and sodium phosphate
1. 2NaCl + Pb(CH3COO)2 → 2NaCH3COO + PbCl2
2. K2SO4 + SrI2 → KI + SrSO4
3. Cr(NO3)3 + Na3PO4 →CrPO4 + NaNO3
Explanation:
science, not math
clearly define the dependent and independent variables
Maya made this picture to represent a chemical reaction:
Which of the following statements best explains the type of chemical reaction represented by Maya's picture?
1) It is neither a synthesis reaction nor a decomposition reaction because the total mass of the products is less than the total mass of the reactants.
2) It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.
3) It represents a synthesis reaction because the same atoms are present in the reactants and products.
4) It represents a decomposition reaction because two reactants break apart and form two products.
Answer:
2) It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.
Explanation:
This is not a synthesis reaction, which takes place when two or more reactants combine to form one product. This is a single replacement reaction, where the cation of an ionic compound "trades places" with another element that becomes the cation in a new ionic compound.
how many helium atoms are in a mole of helium?
Answer:1 mole of helium gas contains 6.02 x1023 helium atoms
Explanation:I hope this helps
6. An acidic solution of potassium dichromate is mixed with an aqueous solution of
hydrogen peroxide.
Use the information in the table to calculate ASrxn
for each of these reactions. Round all answers to
nearest whole number.
Answer:
-198
-5
-148
Explanation:
The entropy of a system is usually denoted by the symbol 'S'. The change in entropy is given as ΔS. It is generally expressed in JK⁻¹mol⁻¹.
What is entropy?The entropy is defined as the property of a system which measures the disorder or randomness of the system. Like internal energy and enthalpy entropy is a state function and it is also an extensive property.
The change in entropy is given as:
ΔS reaction = S-Products - S -Reactants
1. ΔS = (2 × 192.5 - (3 × 130.58 + 191.50) = -198.24 J/K
2. ΔS = (213.6 + 2 × 188.83) - 186.3 + 2 × 205.0 = -5.04 J/K
3. ΔS = (2 × 220.0) - (2 × 191.50 + 205.0) = -148 J/K
For spontaneous process in isolated systems, the entropy change is positive. The greater the disorder in a system, the higher is the entropy. The solid state has lower entropy.
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If a 60 kg object is moving at a velocity of 10 m/s and it's 25 meters high off the ground what would if mechanical energy be?
Answer:
Like all questions in this sublevel, the work done by non-conservative forces must be related to the changes in energy of the object (see Physics Rules section above). In the case of the car skidding to a stop, the kinetic energy equation (see Formula Fix section below) can be used to determine the initial and final kinetic energy of the car. Since the car is on the ground, the height and potential energy can be regarded as zero.
Explanation:
Which of the following is the correct chemical equation and is properly balanced for:
Iron III oxide reacts with potassium iodide to produce iron III iodide and potassium oxide
Answer:are there any abc or do you have to make an answer?
Explanation:
A dogs ability to sit and roll over on command is an instinct. True or false
Answer:
100% false
Explanation:
instinct is something they are born knowing how to do and sitting and rolling over is something you have to train them to do:)
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