answer.
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
lions [1.4K]
2 years ago
14

Round off each of the following numbers to two significant figures:

Chemistry
2 answers:
Kay [80]2 years ago
7 0
A) 5.2 x 10^2
B) 86.
C) 6.4 x 10^3
D) 5.0
E) 22.
F) 0.89
strojnjashka [21]2 years ago
7 0

Answer:

(a) 5.1 × 10²

(b) 86

(c) 6.4 × 10³

(d) 5.0

(e) 22

(f) 0.89

Explanation:

To round off a number, we consider the number that is to its right. If that number is 5 or higher, we increase the number of interest. If the number to the right is 4 or lower, the number of interest remains the same. When taking less significant figures, we might need to use scientific notation for large or small numbers.

<em>Round off each of the following numbers to </em><em>two</em><em> significant figures: </em>

<em>(a) 517</em>   → 5.1 × 10²

<em>(b) 86.3</em>  → 86

<em>(c) 6.382 × 10³ </em> → 6.4 × 10³

<em>(d) 5.0008</em>  → 5.0

<em>(e) 22.497</em>  → 22

<em>(f) 0.885</em> → 0.89

You might be interested in
Fill in the blanks to complete each statement about the heating of earths surface. Earth takes in thermal energy from the sun in
VLD [36.1K]

Answer: absorption and insulation

8 0
1 year ago
Read 2 more answers
To convert m-ethylaniline to m-ethylfluorobenzene, it should be treated with nitrous acid followed by _____________.
bezimeni [28]

Answer:

NaBF_4

Explanation:

In this reaction, we must exchange the amino group (NH_2) for a fluorine atom (F). Also, the first step in this reaction is the addition of nitrous acid.

We must remember that the amino group in the presence of nitrous acid produces a diazonium salt. The N_2 group is a very good leaving group and many benzene derivatives can be produced from this intermediate (see figure 1).

If what we want is to bond a fluorine atom we must use NaBF_4 to be able to produce m-ethylfluorobenzene (see figure 2).

I hope it helps!

6 0
2 years ago
I make my cup of coffee in the morning by pouring boiling water over ground-up coffee beans held in a special piece of paper and
Zigmanuir [339]
Since there are no choices given, my answer might not be what you're looking for. But it can definitely be a correct answer. The technique is called filtration. Filtration is a physical separation to separate the liquid and solid in a mixture. The mixture should be composed of an insoluble solid in a solvent. The mixture is usually passed through a semi-permeable barrier. In this case, a special piece of paper is used. The solvent is the liquid and the solid is the coffee bean grounds. Only the liquid can pass through the paper. The liquid that passes through the paper is generally called a filtrate.
4 0
2 years ago
If 4.59 g of potassium reacts with 3.6 g of sulfur according to the following reaction, how many grams of potassium sulfide can
EleoNora [17]
First convert the amount of grams you have of each substance to moles. Find your limiting reactant by calculating how many grams are needed to complete this reaction. If done correctly, you would see that we need .226 moles of Potassium to complete this reaction. However, we only have .118 moles of Potassium, so K must be our limiting reactant. Then use the moles of K to find out how many moles of K^2S are made. Then convert the amount of moles of K^2S to grams and you should get 10.3 g K^2S
8 0
1 year ago
How is data not actually obtained from the experiment represented in a line graph? with a double line with only dots with a colo
Fittoniya [83]
The way how <span>data is not actually obtained from the experiment represented in a line graph is defnitely that </span><span>a colored line with a broken line. It is a well known fact that to obtain the actual data from the experiment you there should be plotted points on the line. Hope it will help you! Regards.</span>
7 0
2 years ago
Read 2 more answers
Other questions:
  • Explain why a propane torch is lit inside a hot air balloon during preflight preparations. Which gas law applies?
    15·2 answers
  • An atom has 18 protons and 8 valence electrons which statement would best identify this element
    9·2 answers
  • Find the empirical formula of each of the following compounds. Given mass or for each element in a sample of the compound 3,611
    14·1 answer
  • How many moles of Cu are needed to react with 5.8 moles of AgNO3?<br> Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag
    8·1 answer
  • Barium sulfate, BaSO4, is a white crystalline solid that is insoluble in water. It is used by doctors to diagnose problems with
    13·1 answer
  • A 1.00 L flask is filled with 1.15 g of argon at 25 ∘C. A sample of ethane vapor is added to the same flask until the total pres
    15·1 answer
  • 1 Ca (s) + 2 HF (aq) → 1 CaF2 (s) +1 H2 (g) Identify the coefficient(s). Identify the subscript(s). What is the state of each of
    15·1 answer
  • aleksA sailor on a trans-Pacific solo voyage notices one day that if he puts of fresh water into a plastic cup weighing , the cu
    9·1 answer
  • The above shows a balloon full of gas which has a volume of 120.0 mL
    9·1 answer
  • Complete the following equation of nuclear transmutation.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!