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
dem82 [27]
3 years ago
8

Desceibe each of the following as a measured number or an exact number:5 books5 Ib9.23 g0.035 kg12 roses12 inches in 1 foot361 m

iles100 cm in 1 mHow do you determine the last digit in any measured number?
Chemistry
1 answer:
lord [1]3 years ago
3 0

Answer:

The last digit in any measured quantity of a tool is the minimum it can measure so

5 books ---- Exact number

5 lb ---- measured

9.23 g----- measured

9.035Kg measured

12 roses ------ exact

12 inches in 1 foot ----- exact

361 miles ------- measured

100 cm in 1 m ------- exact

You might be interested in
4. A student started with a 0.032 g sample of copper which he took through the series of reactions described in this experiment.
Elodia [21]

Answer:

Y=48.6\%

Explanation:

Hello,

In this case, we can consider the following chemical reaction for the oxidation of copper which only occurs at high temperatures:

2Cu+O_2\rightarrow 2CuO

In such a way, for 0.032 grams of copper, the following grams of copper (II) oxide (black product) are yielded:

m_{CuO}=0.032gCu*\frac{1molCu}{63.546gCu} *\frac{2molCuO}{2molCu}*\frac{79.546gCuO}{1molCuO}  =0.078gCuO

Therefore, the percent yield is:

Y=\frac{0.038g}{0.078g}*100\%\\ \\Y=48.6\%

Best regards.

6 0
3 years ago
How many grams of P2Cl5 are produced if 2.00 moles of P reacts with an excess of Cl2?
Roman55 [17]

Answer:

m_{P_2Cl_5 }=239.2125gP_2Cl_5

Explanation:

Hello there!

In this case, according to the reaction:

4P+5Cl_2\rightarrow 2P_2Cl_5

Thus, since there is a 4:2 mole ratio of P to P2Cl5 and the molar mass of the later is 239.2125 g/mol, we obtain the following mass as the produced one:

m_{P_2Cl_5 }=2.00molP*\frac{2molP_2Cl_5}{4molP} *\frac{239.2125gP_2Cl_5 }{1molP_2Cl_5} \\\\m_{P_2Cl_5 }=239.2125gP_2Cl_5

Regards!

5 0
3 years ago
The value for ψ in root tissue was found to be -1.6 bars. If you place the root tissue in a 0.1 m solution of sucrose at 20°c in
Allisa [31]

Answer:

\Psi=\Psi_s+\Psi_p\\

I=1;C=0.1;R=0.0831\\

T=20+273=293~C\\

as beaker is open so

\Psi_p=0\\

\Psi=\Psi_s\\\Psi=-2.43483

As ψof solution is lower than the root tissue so water will move out of the root to the solution

Explanation:

8 0
4 years ago
A centimeter and millimeter differ from each other by a factor of _____ ?
Liono4ka [1.6K]



The answer is:  "10" .
_______________________________________________________________
  " A centimeter and millimeter differ from each other by a factor of "10" .
_______________________________________________________________
Note:
____________________________
100 cm = 1 m


1000 mm = 1m

____________
100 * (10) = 1000 .
_________________
The answer is:  "10".
__________________________________________________________
  " A centimeter and millimeter differ from each other by a factor of "10".
__________________________________________________________
7 0
3 years ago
Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs
Akimi4 [234]

Answer and Explanation:

At constant pressure and constant temperature, the Gibbs free energy of a process is given by the following equation:

ΔG= ΔH - T ΔS

The process is spontaneous when ΔG<0. For this, there are four alternatives depending on the signs of ΔH and ΔS and the temperature (T):

1) ΔH negative, ΔS positive ⇒ b)The reaction will be spontaneous at all temperatures.

ΔG= (-H) - T (+S)   ⇒ ΔG<0 always

2) ΔH positive, ΔS negative ⇒ c)The reaction will be nonspontaneous at all temperatures.

ΔG= (+H) - T (-S)   ⇒ ΔG>0 always

3) ΔH negative, ΔS negative ⇒ d)The reaction will be spontaneous at low temperature, but nonspontaneous at high temperature.

ΔG= (-H) - T (-S)  ⇒ ΔG<0 if TΔS is lower than ΔH, because is the positive term

4)ΔH positive, ΔS positive ⇒ a)The reaction will be nonspontaneous at low temperature, but spontaneous at high temperature.

ΔG= (+H) - T (+S) ⇒ ΔG<0 if TΔS higher than ΔH because is the negative term

8 0
3 years ago
Other questions:
  • What do chemical equations show?
    7·1 answer
  • How many atoms are presented in 3.8 moles of sodium hydroxide, NaOH
    11·2 answers
  • What is the symbol of water
    8·1 answer
  • Balance this equation. If a coefficient of "1" is required, choose "blank" for that box.
    14·2 answers
  • Can smoke be transformed into liquid or used as energy or both?
    13·2 answers
  • Which of the following is NOT a binary compound?<br> a. NaCI<br> b. KH2PO4<br> c. KBr
    9·1 answer
  • On Friday, a local hamburger shop sold a combined total of 364 hamburgers and cheeseburgers. The number of cheeseburgers sold wa
    9·2 answers
  • Which of the following statements is true?
    8·1 answer
  • In an experiment, students were given an unknown mineral. The unknown mineral was placed in 150 ml of water. Once in the water,
    7·1 answer
  • What's the basic oxide​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!