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
fomenos
3 years ago
9

THE QUESTION IS NUMBER 10 PLSS HELP WILL GIVE BRAINLIEST

Chemistry
2 answers:
7nadin3 [17]3 years ago
6 0

Answer:

option d is correct

Explanation:

Hope it helps you

masya89 [10]3 years ago
5 0

Answer: D

Explanation:

there are 4 Al and 6 O

You might be interested in
HELP PLEASE ASAP WILL MARK BRAINLIEST
GuDViN [60]

Answer:

b i think

Explanation: sry if wrong

6 0
2 years ago
Read 2 more answers
A radioactive substance of mass 768g has a half life of 3 years. After how many years does it leave only 6g undecayed?​
vagabundo [1.1K]

Answer:

The answer is 21 years.

Explanation:

7×3

8 0
3 years ago
Read 2 more answers
How much of a sample remains after five half-lives have occurred?
timama [110]

Answer:

1/32 of the original sample

Explanation:

We have to use the formula

N/No = (1/2)^t/t1/2

N= amount of radioactive sample left after n number of half lives

No= original amount of radioactive sample present

t= time taken for the amount of radioactive samples to reduce to N

t1/2= half-life of the radioactive sample

We have been told that t= five half lives. This implies that t= 5(t1/2)

N/No = (1/2)^5(t1/2)/t1/2

Note that the ratio of radioactive samples left after time (t) is given by N/No. Hence;

N/No= (1/2)^5

N/No = 1/32

Hence the fraction left is 1/32 of the original sample.

3 0
3 years ago
How many milliliters of a 0.7% stock solution are required to make 2 l of 0.2% solution? how many ml of solvent will be required
Ierofanga [76]
1. To solve this question, you need to equalize the mass of solute for both solution. The calculation would be:
mass of solute= volume*concentration

mass1=mass2
volume1 * concentration1 = volume2 * concentration2
volume1 * 0.7%= 2L *(1000ml/L) * 0.2%
volume1 = 2000ml * (0.2%/0.7%)
volume1= 571.429 ml

2. Since you already have the volume of stock needed, you just need to subtract it from the total solution volume to count the number of solvents needed.
new solution volume= stock volume + diluting solvent volume
2L * 2000ml/L =  571.429ml + diluting solvent volume
diluting solvent volume= 2000ml- 571.429 ml= 1428.571ml
4 0
3 years ago
What is the total number of protons and neutrons in an atom called?
anzhelika [568]

This is called the Mass Number of the isotope of the atom.

Isotopes are different forms of the same atom. They have the same number of protons  but different number of neutrons.

Carbon-12 has mass number  12 as it has 6 protons and 6 neutrons.

Carbon-14 has mass number 14 as its has 6 protons and 8 neutrons.

5 0
3 years ago
Other questions:
  • Which of the following could indicate that a chemical change has taken place?
    11·1 answer
  • Which formula represents a non polar molecule with polar covalent bonds
    12·2 answers
  • WILL GIVE BRAINLEST! --
    9·2 answers
  • What type of harmful bacteria did they feed the mice in the experiment?
    11·1 answer
  • PLEASE HELP WHAT IS THE RIGHT ANSWER
    14·1 answer
  • Using the appropriate starting material, (1) show the synthetic steps of the modified Kiliani-Fischer chain extension synthesis
    5·1 answer
  • View the video clip below and answer the question.
    15·2 answers
  • If the mass ratio of K to F in a compound is 2.06:1, how many grams of F are needed to react with 101g of K?
    10·1 answer
  • How to we measure energy?
    6·2 answers
  • Which pair of formulas represents two compounds that are electrolytes?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!