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
Vera_Pavlovna [14]
3 years ago
8

Помогите срочно сделать по химии промежуточную отестацию за 8 класс

Chemistry
1 answer:
il63 [147K]3 years ago
6 0

Answer:

This is site for English  speakers.  Этот сайт на английском, поэтому вопрос могут удалить

Explanation:

1. 2)

2. 3)

3. 4) Sr

4. 3)

5. 4)

6. 2)

7. 1)

8. 4)

9. 3)

10. 3)

11. SO3, H2SO4, Na2SO4

12.

A) оксид меди (II) 2) CuO

Б) хлорид меди(II) 4) CuCl2

В) сульфит меди (II) 3) CuSO 3

Г) гидроксид меди (II) 1) Cu(OH)2

13.

1. Fe+HCl= б) FeCl 2 +H 2

2.Fe+O2= в) Fe 3 O 4

3. Fe(OH) 3  = г)Fe 2 O 3 +H 2O

4. FeCl 2 +NaOH= а) Fe(OH) 2 +NaCl

14. 2Ca + O2 = 2CaO

CaO + H2O = Ca(OH)2

Ca(OH)2 + 2HCl = CaCl2 + 2H2O

You might be interested in
What methods do scientists use to determine if a change was physical or chemical?
Bess [88]
A physical change will not change the chemical make-up of the material. the change will not produce a new substance.

a chemical change will have a reaction that produces heat, light, a change in color, releases a gas, or rust
5 0
3 years ago
For the reaction 2C₆H₅COOH + 15O₂ → 14CO₂ + 6H₂O, which of the following options gives the correct product: product ratio? A.CO₂
Andre45 [30]

Answer:

A. CO2:H2O = 14:6

yw love u

8 0
3 years ago
**PLEASE HELP WITH SCIENCE**
fgiga [73]

it has an electrons in a fixed path together on energy levels.

5 0
3 years ago
There are 2 gasses, A, B. They weigh 2.46g and 0.5g respectively, and the Volume of A is 3 times the volume of B. A has a molecu
dangina [55]

Answer:

B

Explanation:

molecular mass of B is 28

8 0
1 year ago
Read 2 more answers
Question 1 of 25<br> Which sentence describes energy?
Slav-nsk [51]

Answer:

energy is the capability or ability to do work

Explanation:

An object that possesses energy can exert a force on another object. When this happens, energy is transferred from the former to the latter. The second object may move as it receives energy and therefore does some work. Thus, the first object had the capacity to do work.

5 0
1 year ago
Other questions:
  • A substance has a volume of 20 mL and a density of 2.5 g/mL. What is its mass?
    9·2 answers
  • Farmers spray pesticides to protect fruits from pests. What is a possible harmful effect of using pesticides
    12·2 answers
  • Complete the table for the elements with atomic numbers 1-10
    12·1 answer
  • Enter your answer in the provided box. For the simple decomposition reaction AB(g) → A(g) + B(g) rate = k[AB]2 and k = 0.20 L/mo
    7·1 answer
  • Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Supposed 0.301 g of methane
    8·1 answer
  • Express the concentration of a 0.0350 M aqueous solution of fluoride, F − , in mass percentage and in parts per million (ppm). A
    9·1 answer
  • Calculate the density of a material that has a mass of 52.457 g and a volume of 13.5 cm3.
    14·1 answer
  • 1. How many elements are in the following equation, FeCrO4 ?<br> 1<br> 2<br> 3<br> 4<br> O
    6·2 answers
  • How many chromium (II) ions would bond with 2 phosphate ions?
    11·1 answer
  • Guys can you help me please it’s due today
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!