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
uranmaximum [27]
2 years ago
14

4.

Chemistry
1 answer:
Nataly_w [17]2 years ago
6 0

Answer:

The current speed of Sarah is 8 m/s.

Explanation:

Speed:

''It is the distance travel in per unit time". It tells the capacity of moving object how fast it is moving.

Unit:

The system international unit of speed is m/s. It can also be given in Km/h

Formula:

r = d / t

r = speed   (it can also be represented by v)

t = time taken to cover the distance

d =  distance

Given data:

Distance = 400 m

Time = 50 s

Speed = ?

Solution:

v = d/ t

v = 400m / 50 s

v = 8 m/s

You might be interested in
Write the reaction that occurs when propyl methanoate is hydrolyzed in water and in NaOH
Free_Kalibri [48]

An ester , propyl methanoate ( HCOOC₃H₇) when reacts with sodium hydroxide( NaOH) forms sodium methanoate (HCOONa) as the main product and propanol (C₃H₇OH).

The reaction is as follows:

HCOOC₃H₇+NaOH ⇒HCOONa + C₃H₇OH

So when propyl methanoate is hydrolyzed in water and in NaOH then sodium methanoate (HCOONa) as the main product and propanol (C₃H₇OH) forms

5 0
3 years ago
Do light waves interact with all mediums the same?
jeka94

Answer:

Light can be reflected, transmitted, or absorbed. You have read that EM waves can interact with a material medium in the same ways that mechanical waves do.

Explanation:

7 0
3 years ago
Read 2 more answers
A mixture of sodium bicarbonate and ammonium bicarbonate is 75.9% bicarbonate by mass. what is the mass percent of sodium bicarb
Lorico [155]
Answer: 24.1%,  under below assumptions.

Justification:

The question is quite ambiguous, because one of the data is not clearly stated. It says that the mixture consists on two compounds:

- sodium bicarbonate, and
- ammonium bicarbonate

.After, it says that it is 75.9 % bicarbonate, but it does not specify which bicarbonate, it might be the sodium bicarbonate or the ammonium bicarbonate. It is apparent that you omitted that information by error.

Given that later, the question is <span>what the mass percent of sodium bicarbonate is in the mixture, it is supposed that the 75.9% content is of ammonium bicarbonate.

With that said, you can calculate the mass percent of sodium bicarbonate, because there are only two compounds and so you know that both add up the 100% of the mixture.

In formulas:

100% = %m/m sodium bicarbonate + %m/m ammonium bicarbonate = 100%

=> % m/m sodium bicarbonate = 100% - % m/s ammonium bicarbonate

=> % sodium bicarbonate = 100% - 75.9% = 24.1%

Answer: 24.1%
</span>
8 0
3 years ago
What is the smallest substance? <br> 1 .mixture<br> 2 .compound<br> 3 .element
Andrew [12]
Number 3 it’s element
8 0
3 years ago
Read 2 more answers
What is the mass number of an ion with 106 electrons, 157 neutrons, and a +1 charge?
il63 [147K]

Answer:

264 g/mol

Explanation:

#electrons equal #protons = 106

Plus 1 charge => m protons = 106 + 1 = 107

Mass number: 107 + 157 = 264 g/mol

5 0
3 years ago
Other questions:
  • Two or more atoms that share electrons equally make a?
    10·1 answer
  • Which element from group 2A will form an ion that will have 36 electrons?
    11·1 answer
  • Write the full ground-state electron configuration for each:<br> (a) Rb (b) Ge (c) Ar
    13·1 answer
  • What is the maximum number of moles of N-acetyl-p-toluidine can be prepared from 70. milliliters of 0.167 M p-toluidine hydrochl
    13·1 answer
  • The answer ........................... ..
    6·1 answer
  • Consider a reaction that has a positive ΔH and a positive ΔS. Which of the following statements is TRUE?A) This reaction will be
    12·1 answer
  • When only one color of light reflects from a piece of paper, what happens to the other colors of light? Remember that light is e
    7·2 answers
  • I need help ASAP........
    12·1 answer
  • The human body is about 9.5% carbon atoms, with a small fraction of that carbon being radioactive carbon-14. Carbon dating is a
    8·1 answer
  • How many electrons must be lost in Li?.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!