1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kirill [66]
3 years ago
9

Somebody help pls i need it

Chemistry
2 answers:
Arisa [49]3 years ago
7 0
3) D
4) A
5) A
6) true
7) B
Natali5045456 [20]3 years ago
4 0

Answer:

q.3 ans - food

q.4 ans - light energy

thank you

You might be interested in
What are the two fundamental portions of an atom?​
Mice21 [21]
Number of Protons in an Uncharged Atom
The two main components of an atom are the nucleus and the cloud of electrons. The nucleus contains positively charged and neutral subatomic particles, whereas the cloud of electrons contains tiny negatively charged particles.
4 0
3 years ago
A decomposition reaction always breaks a compound down into two pure elements. True or False.
skelet666 [1.2K]

False-- most of the time not enough energy is put into the system, so the compounds or whatever cant break down fully into their elements

6 0
4 years ago
Read 2 more answers
. What is a carbonyl group? Draw the carbonyl groups that are characteristic of aldehydes, ketones, carboxylic acids, and esters
Elan Coil [88]

Answer :

  • Carbonyl group : It is a functional group composed of a carbon atom that double bonded to oxygen atom. It is represented as C=O

Carboxylic group : It is the class of organic compound in which the carboxylic (-COOH) group is attached to a hydrocarbon is known as carboxylic.

The general formula of carboxylic is, C_nH_{2n+1}COOH. According to the IUPAC naming, the carboxylic are named as alkanoic acids.

Aldehyde group : It is the class of organic compound in which the (-CHO) group is attached to a hydrocarbon is known as aldehyde.

The general representation of aldehyde is, R-CHO. According to the IUPAC naming, the aldehyde are named as alkanals.

Ketone group : It is the class of organic compound in which the (-CO) group is directly attached to the two alkyl group of carbon is known as ketone.

The general representation of ketone is, R-CO-R^'. According to the IUPAC naming, the ketone are named as alkanone.

Ester group : It is the class of organic compound in which the (-COO) group is directly attached to the two alkyl group of carbon is known as ester.

The general representation of ester is, R-COO-R^'. According to the IUPAC naming, the ester are named as alkyl alkanoate.

6 0
3 years ago
Magnesium reacts steadily with hydrochloric acid
balu736 [363]

Magnesium + Hydrocloric acid -> Magnesium chloride + hydrogen

You can observe a single displacement reaction

"Describe to show that the has formed is hydrogen"

I don't know what you mean. I can show the chemical equation though.

Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)

3 0
3 years ago
22.5 g of silver nitrate reacts with excess magnesium bromide, determine the mass
Setler [38]

Answer:

9.82 g of Mg(NO₃)₂

Explanation:

Let's determine the reaction:

2AgNO₃  +  MgBr₂  → Mg(NO₃)₂  +  2AgBr

2 moles of nitrate silver reacts with MgBr₂ in order to produce 1 mol of magnesium nitrate and silver bromide.

We determine the moles of AgNO₃

22.5 g . 1mol / 169.87g = 0.132 moles

Ratio is 2:1.

2 moles of silver nitrate can produce 1 mol of magnesium nitrate

Then, our 0.132 moles may produce (0.132 . 1)/ 2 = 0.0662 moles

We convert moles to mass:

0.0662 mol . 148.3 g/ mol = 9.82 g

6 0
3 years ago
Other questions:
  • The science of the creation of maps and charts is called
    7·1 answer
  • Why would 18 be wrong for the atomic mass of an atom with 6 neutrons, 6 electrons, 6 protons?
    12·1 answer
  • In what order did mendeleev arrange the elements in his periodic table?
    5·1 answer
  • How is the sun involved in a food web?<br>​
    15·2 answers
  • What is the gram formula mass of Fe(NO3)3
    10·1 answer
  • Which statement best explains why water has a higher boiling point than ethane?
    10·2 answers
  • Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. C2H6 + O2 → CO2 + H2O
    10·2 answers
  • A hydrogen filled balloon has a bolume of 8.3 L at 36 C and 751 torr. How many moles of hydrogen are inside the balloon?
    13·1 answer
  • What can physical properties not separate?
    10·1 answer
  • What do you think is the primary reason why the Unionid mussel population declined whenever there is a dramatic increase in the
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!