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3 years ago

1. An element is defined by the number of:

Chemistry

1 answer:

IrinaVladis [17]3 years ago

3 0

Answer:

The correct answer for this question would be B) Protons

Explanation:

I got it right on my test (Can I have brainlyest)

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A chemist divides a large sample of a mixture into three smaller portions. Each of these portions contains different ratios of t

ehidna [41]

Answer:

Heterogeneous mixture

Explanation:

A mixture is a substance that is made up of different components that are not chemically combined. For example, the air is a mixture containing gaseous components.
A pure substance, on the other hand, is a substance that contains similar particles. For example, an element is a pure substance with similar atoms and a compound is a pure substance with similar molecules.
A mixture may either be homogeneous or heterogeneous.
A homogeneous mixture contains various fractions of components in a single-phase while a heterogeneous mixture contains components in different phases and different ratios.

3 0

4 years ago

Read 2 more answers

You weigh two different objects on the same scale in the same location earth.the weighs are different.which must be different ab

soldier1979 [14.2K]

Their weights could be different.
Their volumes could be different.
Their densities could be different.

The volume for an ounce of lead is much different than an ounce of aluminum.

the weight of a cubic meter of balsa wood is much different (and much lighter) than a cubic meter of water. That's why the ancients used balsa for their rafts.

8 0

3 years ago

Read 2 more answers

Air, with an initial absolute humidity of 0.016 kg water per kg dry air, is to be dehumidified for a drying process by an air co

amid [387]

Answer:

(a) The proportion of dry air bypassing the unit is 14.3%.

(b) The mass of water removed is 1.2 kg per 100 kg of dry air.

Explanation:

We can express the proportion of air that goes trough the air conditioning unit as $p_{d}$ and the proportion of air that is by-passed as $p_{bp}$ , being $p_{d}+p_{bp}=1$ .

The amount of water that goes into the drier inlet has to be 0.004 kg/kg, and can be expressed as:

$0.004 = 0.016*p_{bp}+ 0.002*p_{d}$

Replacing the first equation in the second one we have

$0.004 = 0.016*(1-p_{d})+ 0.002*p_{d}=0.016-0.016*p_{d}+0.002*p_{d}\\0.004 - 0.016 = (-0.016+0.002)*p_{d}\\-0.012 = -0.014*p_{d}\\p_{d}=\frac{-0.012}{-0.014}=0.857\\\\p_{bp}=1-p_{d}=1-0.857=0.143$

(b) Of every kg of dry air feed, 85.7% goes in to the air conditioning unit.

It takes (0.016-0.002)=0.014 kg water per kg dry air feeded.

The water removed of every 100 kg of dry air is

$100 kgDA*0.857*0.014 kgW/kgDA= 1.1998 \approx 1.2 kgW$

It can also be calculated as the difference in humiditiy between the inlet and the outlet: (0.016-0.004=0.012 kgW/kDA) and multypling by the total amount of feed (100 kgDA).

100 * 0.012 = 1.2 kgW

7 0

4 years ago

What number should be placed in front of Fe to balance this chemical

andrew-mc [135]

the answer is B. 2

because there is 2 iron on the right side so you need another two on the left side to balance it out

6 0

3 years ago

Phosphorous acid, H 3 PO 3 ( aq ) , is a diprotic oxyacid that is an important compound in industry and agriculture. p K a1 p K

Novay_Z [31]

Answer:

a. 0.60

b. 1.30

c. 4.00

d. 6.70

e. 10.20

Explanation:

The 3 attached files shows a comprehensive solution

to the problems with answers highlighted as above

4 0

3 years ago