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ololo11 [35]
3 years ago
13

Round the following number to four significant figures and express the result in standard exponential notation: 442,722 *

Chemistry
1 answer:
OleMash [197]3 years ago
5 0

Answer:

4.427 × 10⁵

Explanation:

In mathematics, rounding up a number is a way to get a more simpler figure but not too distant from the original number. Rounding up a whole number like this (442722) to significant figures means having only four non-zero digits in the figure i.e. 442722 ~ 442700.

This means that 442722 has been rounded up to 4s.f. Hence, to use scientific notations to represent our answer, we count the number of decimal places from right to left i.e.

442700 = 5 decimal places if the point is between 4 and 4 i.e. 4.427

Therefore, the figure 442700 can be written as 4.427 × 10⁵ using scientific notation.

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"CU" is a pair of letters the element we call "copper".
Montano1993 [528]

Answer:

C. Symbol

Explanation:

The letters CU is a chemical symbol used to identify the said metal.

Elements are distinct substances that cannot be split up into simpler substances. Such substances consists of only one kind of atom. The numbers of elements know till date exceeds hundred. Every matter is a combination these various elements.

In the world of science, each of the element is symbolized by a capital letter or capital letter followed by a small letter usually derived from their Greek, Latin or English names.

For copper, it is derived from a latin word Cuprum and its symbol is Cu.

8 0
3 years ago
In Chef’s famous Beef Wellington, you have to get the pastry just right. According to the recipe, Chef uses 400g of butter. But
lisabon 2012 [21]

Amount of butter Chef used = 400g

1 g = 0.035274 oz

Therefore, 400 g = 0.035274 x 400 oz = 14.1096 oz

A) Chef Jacqueline should use __14.1096______ oz of butter.

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Therefore, 400 g =  0.00220462 x 400 pound = 0.881848 pound

B) Chef Amy should use _0.881848________ pounds of butter.

5 0
3 years ago
You are asked to make 10 moles of iron (Fe) from iron oxide (fe203) and excess carbon monoxide (CO).
HACTEHA [7]
5 moles.
think about the ratio of moles of iron oxide (Fe2O3) and iron (Fe) in that balanced chemical equation, which is 1:2, respectively. if there are 10 moles of Fe, you would divide that by 2 to get the number of moles of Fe2O3.
6 0
3 years ago
F(x) = x^2 +1<br> What is f(f(x))?
san4es73 [151]

Answer:

(f(x))

f(x) + 3

[3f(x)

Explanation:

5 0
3 years ago
2 moles of a gas have a pressure of 2 atm at a temperature of 300 K. What is the volume of the gas?
qwelly [4]
  • No of moles=2mol=n
  • Pressure=2atm=P
  • Temperature=300K=T
  • Volume=V

\\ \tt\hookrightarrow PV=nRT

\\ \tt\hookrightarrow V=\dfrac{nRT}{P}

\\ \tt\hookrightarrow V=\dfrac{2(8.314)(300)}{2}

\\ \tt\hookrightarrow V=8.314(300)

\\ \tt\hookrightarrow V=2494.2mL

\\ \tt\hookrightarrow V=24.94dm^3

4 0
2 years ago
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