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3 years ago

At constant pressure, which of these systems do work on the surroundings? Check all that apply.

1 answer:

5 0

A(g) + B(g) → 3C(g)

This is because the volume of gas after reaction is greater than that before the reaction (because there are more moles in the product than in the reactants) so the system's boundary will have to expand in order to maintain constant pressure; this means that the system will do work on its surroundings.

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Which three statements about gravity and the formation of the solar system

Delicious77 [7]

Answer:

B. Gravity held the pieces of forming planets together.

c. Gravity pulled most of the matter into the center of the solar system

D. Gravity caused the planets and Sun to have spherical shapes.

Explanation:

When a collection of grains pulled together by their gravitational forces would keep in by the gravity of a star, it would eventually became bigger to the point a planet was formed.

The sun's strong gravitational force pulled most of the matter around it to the center of the solar system.

The spherical shape of planets is a result of their gravity pulling equally from all sides, shaping it into a sphere.

7 0

2 years ago

Read 2 more answers

Balance the Equation with the steps please:)

vivado [14]

Explanation:

Fe2o3+ 3co ---------. 2fe + 3co2

8 0

3 years ago

Read 2 more answers

Where y and x are concentrations of the peptide in the extract and raffinate, respectively in g/L. It is desired to extract at l

zubka84 [21]

Answer:

sadjf akasj fk a

sadkf

ldj

a d i

i d o n t k n o w

Explanation:

6 0

3 years ago

815 yd to km (need 3 sig fig)

SpyIntel [72]

Answer: The correct answer is 0.745 km

Explanation:

We are given:

A numerical value of 815 yards

To convert this into kilometers, we use the conversion factor:

1 km = 1093.6 yards

Converting the given value into kilometers, we get:

$\Rightarrow 815yd\times \frac{1km}{1093.6yd}=0.745km$

Hence, the correct answer is 0.745 km

5 0

3 years ago

Which of the following represents the smallest mass? I.) 23 cg II.) 2.3 x 10-3 μg III.) 0.23 mg IV.) 0.23 g V.) 2.3 x 10-2 kg

jenyasd209 [6]

The smallest mass among the choices is Choice (ii):2.3 x 10-3 μg

This is so because, the prefix μ signifies a factor of 10^-6.

For choice I:

23 cg means 23 centigrams

In essence = 0.23grams

For choice II:

2.3 × 10-3 μg means 2.3 × 10-9 grams

For choice III:

0.23 mg means 0.23 × 10-3 grams

For choice IV:

0.23 grams simply means 0.23grams

For choice V:

2.3 × 10-2 kg means 23 grams

Ultimately, Choice II represents the smallest mass.