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3 years ago

Which of the following numbers is correctly rounded to three significant figures, as shown in brackets?

Chemistry

1 answer:

vodomira [7]3 years ago

4 0

Answer:

D is correctly rounded to three significant figures.

Explanation:

A is incorrect because although it has 3 significant figures, it is rounded incorrectly. The correct answer would be 12,600.

B is incorrect because is rounded to 4 significant figures instead of three.

C is also incorrect because is rounded to 4 significant figures instead of three.

D is correctly rounded to three significant figures.

E is also incorrect because is rounded to 4 significant figures instead of three.

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[1] b) In a local election there were 8000 registered voters. Of these 3200 voted. What was the percentage that voted? [1] <

Alexandra [31]

Answer:

40% of registered voters voted

Explanation:

3200 out of 8000,

or :

3200 / 8000

= 0.4

0.4 x 100 = 40

40% of registered voters voted

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2 years ago

How many atoms does Iron oxide have?

ArbitrLikvidat [17]

Added together = 159.7 grams for one mole of Fe2O3. That is moles of hematite, but the question is about iron. We can see there are two iron atoms for every hematite molecule. So the number (moles) of iron atoms is twice the moles of the hematite molecules.

so depending on how much you initially have will determine the answer

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3 years ago

12. Draw an energy curve for a chemical reaction that begins at 30 kj and has an activation energy of

Rufina [12.5K]

Answer:

Since the activation energy is $50kJ$ , we need to supply it $50kJ$ from $30kJ$ to make it $80kJ$ .

Diagram attached in the file .

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3 years ago

Which describes the products created from fission reactions? Question 3 options:

Ipatiy [6.2K]

Answer: The correct answer is option A.

Explanation:

Nuclear fission reactions are a type of nuclear reactions in which larger nuclei breaks apart into two or more smaller fragment releasing alpha, gamma of beta particles.

There are 3 types of particles that can be released during this process:

1. Alpha particles: These particles are released when a nuclei undergoes alpha-decay process.

$_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\alpha$

2. Beta particles: These particles are released when a nuclei undergoes beta-minus decay process.

$_Z^A\textrm{X}\rightarrow _{Z+1}^{A}\textrm{Y}+_{-1}^0\beta$

3. Gamma radiations: these radiations are released when an unstable nuclei gives off excess energy by a process of spontaneous electromagnetic process.

$_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma$

Hence, any of these particles can be released during the process of fission reaction with smaller atoms.

Therefore, the correct answer is option A.

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3 years ago

Which of the following would dissolve in water? CCl4 LiCl CH4 PCl6

babymother [125]

Like dissolves like
so water is polar

CCl4 is nonpolar
LiCl is polar
CH4 is nonpolar
PCl6 is nonpolar

so LiCl would dissolve

7 0

3 years ago

Read 2 more answers

Which of the following numbers is correctly rounded to three significant figures, as shown in brackets?​

Which of the following numbers is correctly rounded to three significant figures, as shown in brackets?