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inessss [21]
2 years ago
8

Melissa and ashley play tennis every afternoon. Twenty minutes into the game they both start to breath heavy, sweat, and feel th

eir heart beat faster. which two body systems are working together to cause these reactions?
A. Digestive and Reproductive
B. Respiratory and Circulatory
C. Endocrine and Urinary
D. Nervous and Digestive​
Chemistry
1 answer:
marysya [2.9K]2 years ago
6 0

Answer:

B. Respiratory and Circulatory

I'm pretty sure

Explanation:

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Why are alkali metals more reactive than alkaline earth metals?
Neko [114]
A: It takes more energy to remove two valence electrons from an atom than one valence electron. This makes alkaline Earth metals with their two valence electrons less reactive than alkali metals with their one valence electron.
5 0
3 years ago
Classify the compound below as an alkane, alkene, alkyne, alcohol, aldehyde, amine, and so forth
Gnoma [55]

<em>Answer:</em>

  • Organic compounds are those which are derivatives of hydrocarbons. They are classified into following functional groups.

<em>Alkane:  </em>

  • Alkane are simplest hydrocarbons.
  • They have general formula CnH2n+2. These hydrocarbons contain single bond.
  • For example ethane , H3C----CH3.

<em>Alkene:</em>

  • Alkene are most reactive.
  • They have general formula CnH2n.
  • These contain double bond in their structure.
  • For example , ethene, H2C=CH2

<em>Alkyne:</em>

  • These are less less reactive as compare to alkenes.
  • They have general formula CnH2n-2.
  • They contain triple bonds in their structure.
  • For example Acetylene HC≡CH

<em>Alcohol:</em>

Alcohol have functional group OH. They have general formual R---OH, R may be alkyl group.For example Ethanol H3CH2C---OH

<em>Amine:</em>

  • Amine contain NH2 F.G.
  • They have general formula R---NH2.
  • There are three types of amine like primary, secondary and tertiary amine.
  • For example H3CH2C---NH2

<em>Aldehyde:</em>

  • Aldehydes have CHO F.G .
  • They have general formula R--CHO.
  • For example H3CH2C---CHO

<em>Ketone:</em>

  • Ketones have R--CO--R functional group.
  • For example acetone H3C---CO---CH3

<em>Carboxylic acid:</em>

  • They functional group COOH.
  • Their general formula is R---COOH.
  • For example Acetic acid H3C---COOH
6 0
3 years ago
Chrissy is doing her chemistry homework and comes across the chemical formula for 3 molecules of nitric acid, represented by 3HN
dybincka [34]

Answer:

C

Explanation:

The 3 goes to every term in the molecule

3 NHO3

So its

3x1 N's

3x1 H's

3x3 O's

5 0
2 years ago
The volume of a pond being studied for the effects of acid rain is 35 kiloliters (kL). There are 1,000 liters (L) in 1 kL and 1
MrMuchimi
The volume of a pond being studied for the effects of acid rain is 35 kiloliters (kL). There are 1,000 liters (L) in 1 kL and 1 x 10^6 <span>microliters (mL) in 1 L. 

35 kL (1,000 L/ 1kL) (</span>1 x 10^6 microliters / 1 L) = 3.5 x 10^10 microliters<span>

The volume of this pond in microliters is </span><span>3.5 x 10^10 microliters</span>
8 0
3 years ago
Vaporization is the reverse of
IRINA_888 [86]
 <span>Since Vaporization is when liquid turn to gas then the opposite of that would be Condensation because condensation is when gas turns to liquid <-- see complete opposites :D</span>
3 0
3 years ago
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