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
Lina20 [59]
3 years ago
12

40 000 L + 125 000 L scinetific notation

Chemistry
1 answer:
Sladkaya [172]3 years ago
8 0
4 x 10^4 L +1.25 x 10^5
You might be interested in
What is meant by bio chamistery ,industtial chemistery and organic chemistery ?​
Inessa [10]
Bioorganic chemistry is a rapidly growing scientific discipline that combines organic chemistry and biochemistry. It is that branch of life science that deals with the study of biological processes using chemical methods.
8 0
3 years ago
Each of the following phrases matches one of the models below. Match the statement with its appropriate model.
muminat
Not sure about any others but I believe 3 goes with B
4 0
1 year ago
The cost of painting the circular traffic sign shown below is $3.50 per square foot. How much, to the nearest dollar, will it co
KiRa [710]

The cost of painting the traffic sign of 7.065 square feet is approximately equal to 25 dollar.

<u>Explanation:</u>

The cost of painting the circular traffic sign is given as 3.50 dollar per square feet. The diameter of the traffic sign is 36 inch, then its radius will be \frac{36}{2} = 18 inches.

But as the cost is given in unit of feet, we have to convert the radius from inches to feet.

1 inches = 0.0833 feet

18 inches = 18 × 0.0833 feet

So, the radius of the traffic sign will be approximately equal to 1.5 feet.

The area of the traffic sign will be \pi r^{2} = 3.14 \times 1.5 \times 1.5 = 7.065 square feet.

So, if the cost of painting 1 square feet of traffic sign is 3.50 dollar, then

cost of painting 7.065 square feet of traffic sign =  3.50 × 7.065 = 24.7 dollar.

Thus, the cost of painting the traffic sign of 7.065 square feet is approximately equal to 25 dollar.

8 0
3 years ago
Help if possible!<br> Picture attached with the problems.
MAVERICK [17]
1. 1 M , 2 M , 1 M
2. 10 mol , 0.1 mol , 0.5 mol
3. 0.5 L , 6.6 L , 5/21 L

M = mol/L
8 0
2 years ago
A certain radioactive isotope decays at a rate of 0.2​% annually. Determine the ​half-life of this​ isotope, to the nearest year
pychu [463]

Answer:

The half-life of the radioactive isotope is 346 years.

Explanation:

The decay rate of the isotope is modelled after the following first-order linear ordinary differential equation:

\frac{dm}{dt} = -\frac{m}{\tau}

Where:

m - Current isotope mass, measured in kilograms.

t - Time, measured in years.

\tau - Time constant, measured in years.

The solution of this differential equation is:

m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }

Where m_{o} is the initial mass of the isotope. It is known that radioactive isotope decays at a yearly rate of 0.2 % annually, then, the following relationship is obtained:

\%e = \frac{m(t)-m(t+1)}{m(t)}\times 100\,\% = 0.2\,\%

1 - \frac{m(t+1)}{m(t)} = 0.002

1 - \frac{m_{o}\cdot e^{-\frac{t+1}{\tau} }}{m_{o}\cdot e^{-\frac{t}{\tau} }}=0.002

1 - e^{-\frac{1}{\tau} } = 0.002

e^{-\frac{1}{\tau} } = 0.998

-\frac{1}{\tau} = \ln 0.998

The time constant associated to the decay is:

\tau = -\frac{1}{\ln 0.998}

\tau \approx 499.500\,years

Finally, the half-life of the isotope as a function of time constant is given by the expression described below:

t_{1/2} = \tau \cdot \ln 2

If \tau \approx 499.500\,years, the half-life of the isotope is:

t_{1/2} = (499.500\,years)\cdot \ln 2

t_{1/2}\approx 346.227\,years

The half-life of the radioactive isotope is 346 years.

6 0
2 years ago
Other questions:
  • A __, such as H2SO4, is a symbol that shows the elements in a compound and the ratio of atoms
    9·1 answer
  • PLS HELPPP I NEED ANSWERS QUICK !! WILL GIVE U BRAINLIEST
    15·1 answer
  • The summer is caused by __________.
    15·1 answer
  • I need to know what a metal nonmetel and metalloid
    13·2 answers
  • A car is traveling 150 km in 7200 s what is the speed of the car
    7·1 answer
  • Which pair of molecules has the strongest dipole-dipole interactions?
    12·1 answer
  • Measurements show that the enthalpy of a mixture of gaseous reactants increases by 186.kJ during a certain chemical reaction, wh
    10·1 answer
  • What would be a likely climatic outcome of rising ocean temperatures?
    10·1 answer
  • What is the value of for this aqueous reaction at 298 K? <br> A+B↽⇀C+D<br> ΔG°=12.86 kJ/mol<br> K=
    5·1 answer
  • I need help question 13
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!