What is the result of multiplying (2.5 × 1010) × (3.5 × 10-7)?
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Related Questions
Substance A is mixed with water and donates 0.4% of its H+ ions. Which of the following BEST describes Substance A?A. It is a strong base and a very poor conductor of electric current.B. It is a strong acid and a very good conductor of electric current.C. It is a weak base and a very good conductor of electric current.D. It is a weak acid and a poor conductor of electric current.
Which group of elements ,in the periodic table, would most likely be used for electrical wires?
Experimental data are collected as: x[100]={1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100}; y[100]={-92.3973,14.0677,98.9626,49.6151,111.88,-38.7967,52.1535,-101.325,65.6111,125.129,151.762, -123.132,-41.8744,-39.3356,-99.7856,-128.881,58.5477,-111.692,-75.3057,4.4723,-100.051,169.051, -15.6953,58.3125,147.346,10.9835,42.3421,166.697,-105.534,-90.2199,151.189,130.022,-8.1448,-51.3493, 164.427,119.154,-99.2704,155.986,133.212,118.035,13.1819,139.678,81.5178,-12.4377,-11.7671,146.627, -25.787,107.25,19.8867,15.6437,112.871,122.552,8.42037,-10.1364,146.682,178.531,203.565,-70.7871, 171.256,-50.6232,193.836,-34.7733,-68.9564,25.3423,75.6537,21.5484,46.5259,-64.22,-13.5792, 74.9213,-26.6872,30.5302,169.534,-36.7224,65.4419,113.978,68.1137,181.414,127.76,145.447,75.5486, 164.201,169.504,110.07,96.713,114.974,155.46,2.72803,-59.9407,13.426,29.9344,-11.052,176.639, 162.505,-18.3784,184.418,234.104,127.227,145.18,0.440172}; Obtain the regression line in the form of y = a x + b.
What are the possible values of ml for an electron in a d orbital?
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Half-life is the time required for the amount of a sample to half its value.
To calculate this, we will use the following formulas:
1.
where:
n - a number of half-lives
x - a remained fraction of a sample
2.
where:
t - total time elapsed
n - a number of half-lives
The half-life of Sr-90 is 28.8 years.
So, we know:
t = 87.3 years
We need:
n = ?
x = ?
We could first use the second equation, to calculate n:
If:
Then:
⇒
⇒
⇒ n ≈ 3
Now we can use the first equation to calculate the remained amount of the sample.
⇒
⇒
B) melting an iron bar
C) crushing an aluminum can
D) burning magnesium ribbon
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Final answer:
Among the given options, burning a magnesium ribbon results in a chemical change. It is because the burning process changes magnesium into a new substance, magnesium oxide.
Explanation:
The process that results in a chemical change among the given options is D) burning magnesium ribbon. A chemical change is a process where one or more substances are altered into one or more new and different substances. In the case of burning magnesium ribbon, the magnesium reacts with the oxygen in the air to create a new substance, magnesium oxide. This is a characteristic of a chemical change, which is very different from physical changes caused by tearing tin foil, melting an iron bar, or crushing an aluminum can. These actions alter the physical state or shape of the matter, but not its internal structure or chemical composition.
Learn more about Chemical Change here:
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15.0 moles of ammonium sulfate are formed by the reaction of 30.0 moles of ammonia with sulfuric acid.
Let's consider the reaction between ammonia and sulfuric acid to produce ammonium sulfate.
2 NH₃ + H₂SO₄ ⇒ (NH₄)₂SO₄
The molar ratio of NH₃ to (NH₄)₂SO₄ is 2:1. The moles of (NH₄)₂SO₄ produced from 30.0 moles of NH₃ are:
15.0 moles of ammonium sulfate are formed by the reaction of 30.0 moles of ammonia with sulfuric acid.
Learn more: brainly.com/question/9743981
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The net ionic equation is
Ag⁺(aq) +Cl⁻(aq) → AgCl(s)
Explanation
AgNO₃ (aq) + KCl (aq)→ AgCl(s) +KNO₃(aq)
from above molecular equation break all soluble electrolyte into ions
Ag⁺(aq) +NO₃⁻ (aq) + K⁺(aq) +Cl⁻(aq) → AgCl (s) + K⁺(aq) + No₃⁻(aq)
cancel the spectator ions in both side of equation =K⁺ and NO₃⁻ ions
The net ionic equation is therefore
= Ag⁺(aq) + Cl⁻(aq) → AgCl(s)
SiC
C25H52
Zn
Answers
Answer:
The paraffin is the softest.
Explanation:
The others materials, they have a bigger value of hardness in Mohs scale, like the CuO with a value of 3.5, the SiC with a value of 9, and Zinc with a value of 2.5.
What volume of oxygen gas is released at STP if 10.0 g of potassium chlorate is decomposed? (The molar mass of KClO3 is 122.55 g/mol.)
Answers
KClO₃ = 122.55 g/mol
O₂ = 32 g/mol
2 KClO₃ = 2 KCl + 3 O₂
2 x 122.55 g KClO₃ ----------> 3 x 32 g O₂
10.0 g KClO₃ ------------------> ?
Mass of O₂ = ( 10.0 x 3 x 32 ) / ( 2 x 122.55 )
Mass of O₂ = 960 / 245.1
Mass of O₂ = 3.9167 g
number of moles O₂ => 3.9167 / 32 = 0.1223 moles
1 mol -------------- 22.4 L ( at STP)
0.1223 moles ---- ?
V = 0.1223 x 22.4 / 1
V = 2.739 L
hope this helps!
Your answer is 2.74.