All categories

3 years ago

(20 Points) Which definition of "coarse" matches its use in the phrase "coarse focus?"

Chemistry

2 answers:

vlada-n [284]3 years ago

7 0

Answer by YourHope:

Hi! :)

Which definition of "coarse" matches its use in the phrase "coarse focus?"

A) "rough in texture"

Have a BEAUTIFUL day~

Finger [1]3 years ago

6 0

C) crude or unrefined

The course focus is the rough or basic focus knob on a microscope.

You might be interested in

P4O10 -> 4P+5O2 How many moles of phosphorus would be produced if 5.3 mol of P4O10 reacted?

viktelen [127]

Answer:

21.2 moles.

Explanation:

Hello!

In this case, for the given chemical reaction, we can see there is a 1:4 mole ratio between tetraphosphorous decaoxide and phosphorous; therefore, the following proportional factor provides the requested moles of phodphorous:

$n_P=5.3molP_4O_{10} *\frac{4molP}{1molP_4O_{10}} \\\\n_P=21.2molP$

Best regards!

5 0

3 years ago

A fruit-and-oatmeal bar contains 142 nutritional Calories. Convert this energy to calories

madreJ [45]

Answer:

a fruit and oatmeal bar contains 142000 calories.

A nutritional calorie, or kilocalorie, is equal to 1000 calories.

E = 142 kcal · 1000 cal/kcal.

E = 142 000 cal.

Calorie (cal), or small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius.

One small calorie is approximately 4.2 joules.

A calorie is a unit of energy.

Explanation:

hope it helps :)

4 0

3 years ago

13. What is the molality of a solution with 18.4 moles LiF in 26 kg H2O? *

melisa1 [442]

Here, We are asked to calculate the molarity of a solution with 18.4 moles of Lithium Fluoride in 26 kg of water... To find the molarity, We need to divide the number of moles by the volume of solution in liters

»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»«»

Number of moles = 18.4
Volume of solution = 26 kg = 37.14 liters

$\tt \twoheadrightarrow \: molarity = \frac{number \: of \: moles}{volume \: of \: solution}$

$\tt \twoheadrightarrow\: molarity = \frac{18.4}{37.14}$

$\sf \Rrightarrow \: molarity = 0.71 \: molar$

➪ Therefore, The molarity of solution is 0.71 molar...~

4 0

3 years ago

Read 2 more answers

Assume that you did the following dilutions

MrMuchimi

Below is the solution. I hope it helps.

CfVf = CiVi
Cf = (CiVi)/ Vf 

i. Cf = [ (10^-6 mol / L) (1 mL) (1L / 1000 mL) ] / [ (1kL) (1000L / 1 kL) ] = 1x10^-12 M → use as Ci in next dilution 
ii. Cf = 1x10^-19 M → use as Ci in next dilution 
iii. Cf = 1x10^-22 M

6 0

3 years ago

Read 2 more answers

Which is a chemical property of iron?

Marta_Voda [28]

I believe it would be the first option. It forms iron oxide (rust) when exposed to moisture and air.

7 0

3 years ago

Read 2 more answers