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klasskru [66]
3 years ago
12

When two substances react to form a new material with different properties, a _______change has occurred.

Chemistry
1 answer:
dlinn [17]3 years ago
5 0
When two substances react to form a new material with different properties, a Chemical change has occurred.
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Hydrogen reacts with 0.771 g of carbon to form 0.90 g of a compound. What is the mass percent of hydrogen in the compound
morpeh [17]
Answer: 14.3%

Explanation: In order to find the mass percent of hydrogen in this compound, you must determine how many grams of hydrogen you'd get in 100 g of compound. 

In your case, you know that an unknown mass of hydrogen reacts with 0.771 g of carbon to form 0.90 g of hydrocarbon, which is a compound that contains only carbon and hydrogen. 

Use the total mass of the hydrocarbon to determine how many grams of hydrogen reacted with the carbon.

Now, if 0.90 g of this compound contain 0.129 g of hydrogen, it follows that 100 g of this compound will contain.

So, if 100 g of this compound contain 14.33 g of hydrogen, it follows that the mass percent of hydrogen is 14.3%


<span><span><span><span><span><span><span><span><span /></span></span></span></span></span></span></span></span><span><span>
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4 0
3 years ago
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Which to which! Ahhhh.
jarptica [38.1K]

Answer:

1.a

2. b

Explanation:

Distillation is a process whereby a mixture of liquids having different vapor pressures is separated into its components. At first one might think that this would be quite simple: if you have a solution consisting of liquid A that boils at 50°C and liquid B with a boiling point of 90°C, all that would be necessary would be to heat the mixture to some temperature between these two values; this would boil off all the A (whose vapor could then be condensed back into pure liquid A), leaving pure liquid B in the pot. But that overlooks that fact that these liquids will have substantial vapor pressures at all temperatures, not only at their boiling points.

source: https://chem.libretexts.org/Bookshelves/General_Chemistry/Book%3A_Chem1_(Lower)/08%3A_Solutions/8.09%3A_Distillation

3 0
1 year ago
Law of Universal Gravitation (what factors affect gravity and how?)
olya-2409 [2.1K]

Explanation:

Hey there!

According to the law of gravitation, the factors that affects the gravity are:

  • Mass of the heavenly bodies.
  • Distance from the centre of the body to next body.

Mass of heavenly bodies:<em>The </em><em>ma</em><em>s</em><em>s </em><em>of </em><em>heavenly</em><em> bodies</em><em> </em><em>affect</em><em> </em><em>the </em><em>gravity</em><em>.</em><em> </em><em>We </em><em>know </em><em>that </em><em>gravity</em><em> is</em><em> </em><em>directly</em><em> proportional</em><em> to</em><em> the</em><em> </em><em>mass </em><em>of</em><em> heavenly</em><em> bodies</em><em>.</em><em> </em><em>so,</em><em> </em><em>when </em><em>the </em><em>mass </em><em>is </em><em>more </em><em>there </em><em>is </em><em>more </em><em>gravity </em><em>and </em><em>where</em><em> </em><em>there </em><em>is </em><em>less </em><em>mass </em><em>there </em><em>is </em><em>less </em><em>gravity</em><em>.</em>

Distance from the centre of the body to next body: <em>It </em><em>is</em><em> </em><em>one </em><em>of</em><em> the</em><em> </em><em>factor </em><em>to </em><em>influence</em><em> </em><em>gravity</em><em>.</em><em> </em><em>When </em><em>there </em><em>is</em><em> </em><em>more </em><em>distance</em><em> </em><em>there </em><em>is</em><em> </em><em>less </em><em>gravity</em><em> </em><em>and </em><em>where </em><em>there </em><em>is </em><em>distance</em><em> </em><em>more </em><em>force </em><em>is </em><em>there.</em><em> </em><em>Is </em><em>means </em><em>gravity</em><em> is</em><em> </em><em>inversely</em><em> proportional</em><em> to</em><em> </em><em>the </em><em>distance</em><em> </em><em>between </em><em>the </em><em>bodies</em><em>.</em>

<em><u>Hope </u></em><em><u>it</u></em><em><u> helps</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>

7 0
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How can I lucid dream?
xxMikexx [17]

Answer:

Set an alarm for five hours after your bedtime.

Go to sleep as usual.

When the alarm goes off, stay up for 30 minutes. Enjoy a quiet activity like reading.

Fall back asleep.

Explanation:

8 0
3 years ago
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Isotopes have the same number of protons but different number of:
QveST [7]

Answer:

neutrons

Explanation:

isotopes have the same number of protons nut different number of neutrons. the difference in thr mumber of neutrons give them their uniques properties.

6 0
2 years ago
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