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
Rus_ich [418]
2 years ago
12

I need help this is 7th grade science

Chemistry
1 answer:
GREYUIT [131]2 years ago
8 0

Answer:

i need to know the question then i can help :)

Explanation:

You might be interested in
Fountain
iren2701 [21]

Answer:

4104 Coulombs

Explanation:

charge = time(sec) *current

25*60 =1500+20=1520

2.7A * 1520 sec =4104

4104 C

3 0
2 years ago
Why all compounds are molecules but not all molecules are compounds.
Rina8888 [55]

Answer:

Explanation:

A molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds. are not compounds because each is composed of a single element.

3 0
2 years ago
Read 2 more answers
Magnesium has three common isotopes.
sladkih [1.3K]

Answer:

Explanation:

percentage abundance of third isotope = 100 - ( 78.900 + 10.009)

= 11.091 %

Atomic mass

24.1687 x .789 + 25.4830 x .10009 + 24.305 x .11091  

19.069 + 2.5506 + 2.69566

= 24.3153 amu

7 0
2 years ago
A stock solution of 1.00 M Fe2(SO4)3 is available. How many milliliters are
Andrews [41]

Answer:

375 mL

Explanation:

M1*V1 = M2*V2

M1 = 1.00 M

V1 = ?

M2 = 0.750 M

V2 = 0.500 L

1.00 M * V1 = 0.750 M * 0.500 L

V1 = 0.750*0.500/1.00 = 0.375 L = 375 mL

5 0
3 years ago
What volume of 1.10 M SrCl2 is needed to prepare 525 mL of 5.00 mM SrCl2?
grigory [225]

Answer:- 2.39 mL are required.

Solution:- It's a dilution problem and to solve this type of problems we use the dilution equation:

M_1V_1=M_2V_2

Where, M_1 and M_2 are molarities of concentrated and diluted solutions and V_1 and V_2 are their respective volumes.

M_1 = 1.10M

M_2 = 5.00mM = 0.005M    (since, mM stands for milli molar and M stands for molar. 1M = 1000mM)

V_1 = ?

V_2 = 525 mL

Let's plug in the given values in the formula:

1.10M(V_1)=0.005M(525mL)

V_1=(\frac{0.005M*525mL}{1.10M})

V_1=2.39mL

So, 2.39 mL of 1.10M are needed to make 525 mL of 5.00mM solution.

7 0
2 years ago
Other questions:
  • URGENT HELP! I dont understand anything of this and this is for tomorrow
    9·1 answer
  • Akira records the speed of a reaction, first without a catalyst, and then with a catalyst
    10·2 answers
  • How do the periodic trends in metallic character compare to those for ionization energy? How do the periodic trends in metallic
    10·1 answer
  • What is the chemical formula for the compound formed between rubidium and iodine?
    14·1 answer
  • If an aqueous solution of lead(II) nitrate (Pb(NO3)2) is mixed with an aqueous solution of potassium chloride (KCl) the precipit
    6·1 answer
  • This is a science question. <br> What is its acceleration?
    6·1 answer
  • Which picture best illustrates thermal energy transfer by conduction?
    5·2 answers
  • Complete the following chemical formula and determine the final molarity of NaCl:
    7·1 answer
  • Why Bohr's theory was inadequate?​
    7·1 answer
  • Match the number of neutrons to the correct isotope by studying the atomic number and mass number of each isotope. Drag the item
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!