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2 years ago

Wy do rough, uneven pebbles become smooth and rounded

Chemistry

1 answer:

NeTakaya2 years ago

4 0

Answer:

Due to erosion

Explanation:

When a pebble breaks off from a greater piece it is rough. After being weathered down and constantly hit against by other masses, the side will wear down and smoothen out

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What volume of chlorine gas at 27 °C, 812 mmHg, is required to react with an excess of carbon disulfide so that 5.00kJ of heat i

Kamila [148]

Answer:

The correct answer is 1.21 L.

Explanation:

Based on the given information, the reaction will be,

CS2 (l) + 3Cl2 (g) ⇒ CCl4 (l) + S2Cl2 (l)

By using the standard values of the substances, the standard enthalpy of the reaction is,

ΔH° = [(-139.5) + (-58.5) – 0 – (87.3)] kJ/mol

= -285.3 kJ/mol

The amount of heat evolved for 3 moles of chlorine reacted us 285.3 kJ.

Now the number of moles of chlorine needed to react to produce 5.00 kJ is,

= 5.00 kJ × 3 mol Cl2/285.3 kJ

= 0.0526 mol Cl2

Now the volume of chlorine gas at 27degree C and 812 mmHg will be,

Volume = 0.0526 mol Cl2 × 0.0821 Latm/mol K × 300 K/ 1.07 atm

= 1.21 L

4 0

2 years ago

Which of the following terms describes carbon tetrachloride?(CCI4)

garri49 [273]

The Answer is C.Compound

5 0

3 years ago

Read 2 more answers

Start with 3 breads and 2 cheeses. How many products are made? 1 What are the leftovers?

Tanya [424]

Answer:

1 product is made. The left overs are 1 piece of bread and 1 slice of cheese

Explanation:

8 0

2 years ago

Marigold, Inc. uses activity-based costing as the basis for information to set prices for its six lines of seasonal coats.

agasfer [191]

Answer:

Designing= $42 per designer hour

Sizing and cutting= $26.85 per machine hour

Stitching and trimming= $17.75 per labor hour

Wrapping and packing= $10.5 finished unit

Explanation:

<u>To calculate the activity-based overhead rates, we need to use the following formula:</u>

Predetermined manufacturing overhead rate= total estimated overhead costs for the period/ total amount of allocation base

Designing= 445,200/10,600= $42 per designer hour

Sizing and cutting= 4,081,200/152,000= $26.85 per machine hour

Stitching and trimming= 1,491,000/84,000= $17.75 per labor hour

Wrapping and packing= 346,500/33,000= $10.5 finished unit

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2 years ago

Which procedure did early chemists use to determine which substances were elements?

Gnoma [55]

C.
They broke down materials by chemical means

6 0

3 years ago