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
andrew11 [14]
3 years ago
7

Which force is a contact force

Chemistry
2 answers:
stiks02 [169]3 years ago
8 0

Answer:

B. a bike braking

Explanation:

It involves friction! Hope this helps!

den301095 [7]3 years ago
8 0
B a bike braking because your contacting force on the bike .
You might be interested in
Suppose the half-life is 9.0 s for a first order reaction and the reactant concentration is 0.0741 M 50.7 s after the reaction s
bazaltina [42]

<u>Answer:</u> The time taken by the reaction is 84.5 seconds

<u>Explanation:</u>

The equation used to calculate half life for first order kinetics:

k=\frac{0.693}{t_{1/2}}

where,

t_{1/2} = half-life of the reaction = 9.0 s

k = rate constant = ?

Putting values in above equation, we get:

k=\frac{0.693}{9}=0.077s^{-1}

Rate law expression for first order kinetics is given by the equation:

k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}     ......(1)

where,

k = rate constant  = 0.077s^{-1}

t = time taken for decay process = 50.7 sec

[A_o] = initial amount of the reactant = ?

[A] = amount left after decay process =  0.0741 M

Putting values in equation 1, we get:

0.077=\frac{2.303}{50.7}\log\frac{[A_o]}{0.0741}

[A_o]=3.67M

Now, calculating the time taken by using equation 1:

[A]=0.0055M

k=0.077s^{-1}

[A_o]=3.67M

Putting values in equation 1, we get:

0.077=\frac{2.303}{t}\log\frac{3.67}{0.0055}\\\\t=84.5s

Hence, the time taken by the reaction is 84.5 seconds

6 0
3 years ago
When the following equation is balanced, what is the coefficient of oxygen?
Gwar [14]

Answer:

The answer is 3

C2H5OH + O2 CO2 +H2O (unbalanced)

C2H5OH +3O2(g). 2CO2(g)+3H2O(balanced)

4 0
3 years ago
How many electron dots should As have?
Effectus [21]

Answer:

5

Explanation:

8 0
3 years ago
What volume will be occupied by 11.7 g of Helium in a balloon at an altitude of 10.0 km if the air pressure is 0.262 atm and the
matrenka [14]

Answer: 204 L

Explanation:

According to ideal gas equation:

PV=nRT

P = pressure of gas = 0.262 atm

V = Volume of gas = ?

n = number of moles = \frac{\text {given mass}}{\text {molar mass}}=\frac{11.7g}{4g/mol}=2.92

R = gas constant =0.0821Latm/Kmol

T =temperature =-50^0C=(273+(-50))K=223K

V=\frac{nRT}{P}

V=\frac{2.92\times 0.0820 L atm/K mol\times 223K}{0.262atm}=204L

Thus volume occupied by 11.7 g of Helium in a balloon is 204L

6 0
3 years ago
H2CO3 -&gt; H2O + CO2 What type of chemical reaction is taking place in this
OlgaM077 [116]

Answer: decomposition

Explanation: one molecule forms tro molecules

8 0
2 years ago
Other questions:
  • Write a balanced formation equation at standard conditions for the compound HI.
    14·2 answers
  • What is the molecular formula of a compound whose molar mass is 112 and whose empirical formula is ?
    11·1 answer
  • Why does the Moon orbit Earth instead of the Sun?
    9·1 answer
  • After some wood has completely burned in a fire, some of the matter that made up the wood has been destroyed.
    6·2 answers
  • A beaker contains 0.125 L of a 3.00 M solution. If the volume goes up to 0.325 L, what is the new molarity?
    14·1 answer
  • Help please!! I'll name you brainliest!!
    13·1 answer
  • **Plz help with this asap who ever replies first with the right answer will get brainlists
    7·1 answer
  • What is the source of most of the salt in the oceans?
    13·1 answer
  • A goup of cells that work together to perform a specific function.
    13·1 answer
  • Write application of isotopes .
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!