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3 years ago

THIS IS VERY URGENT!! WILL MARK BRAINLIEST ASAP! PLEASE HELP ME! (Answer both questions.)

Chemistry

2 answers:

zaharov [31]3 years ago

3 0

Answer:

Q1= C

Q2= Ice melts when heat energy causes the molecules to move faster, breaking the hydrogen bonds between molecules to form liquid water. ... This is why an ice cube melts more quickly on the outside and retains its coldness and solidity longer at the center: melting is a cooling process.

Explanation:

Mine was 1st!

erastova [34]3 years ago

3 0

Answer:

C. At first , the water was solid. Then the water was liquid

Explanation:

The water was first ice, which is a solid.

Then it was water, this is a liquid

This means it turned from solid to liquid. Making the Answer C.

Hope you learned something. :) and STAY SAFE !

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svlad2 [7]

Answer:

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3 years ago

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If the following elements were to combine with each other, choose which demonstrate the Law of Multiple Proportion. Select all t

Marysya12 [62]

Answer is: Z:X = 7:1 and Y:X = 11:1.

Law of multiple proportions or Dalton's Law said that the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.
In this example ratios are whole numbers, A:Z = 2.5 : 1 and A:Z = 2.2 : 1 are not whole number ratios.

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3 years ago

Define the term homeostasis

8_murik_8 [283]

Answer:

The ability and tendency of certain systems to maintain a relatively constant internal state in spite of changes in external conditions; this ability is achieved by the presence of feedback mechanisms which can adjust the state of the system to compensate for changes in the state caused by the external environment. It is exemplified in homeothermal biological systems, such as animals which maintain relatively constant blood temperature and composition in spite of variations in external temperature or the composition of the food ingested.

Explanation:

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3 years ago

A 5.00 liter gas sample is collected at a temperature and pressure of 27.0 degree C and 1.20 atm. It is desired to transfer the

kipiarov [429]

Answer:

The temperature of the gas in the 3.00 liter container, must be 150K

Explanation:

Let's apply the Ideal Gas Law, to find out the moles

P . V = n . R . T

1,20 atm . 5L = n . 0,082 L.atm/mol.K . 300 K

(1,20 atm . 5L) / (0,082 mol.K/L.atm . 300 K) = n

6/24,6 mol = n = 0,244 moles

We have the moles now, so let's find the temperature in our new conditions.

P . V = n . R . T

1 atm . 3L = 0,244 moles . 0,082 L.atm/mol.K . T° in K

(1 atm . 3L / 0,244 moles . 0,082 mol.K/L.atm) = T° in K

3/20,008 K = T° in K = 150K

3 0

3 years ago

What is the mass percent concentration of a solution containing 29.0 g NaCl and 115.0 mL of water? Assume a density of 1.00 g/mL

marin [14]

Answer:

Mass percent concentration: 25,2% m/m

Explanation:

The percentage mass by mass indicates the grams of solute in 100 grams of solution. We convert the ml of water into g from the density formula:

δ= m/v m=δx v= 1 g/ml x 115 ml= 115 g

115g solution-----29 g NaCl

100g solution----x=(100g solutionx29 g NaCl)/115g solution

x=25,2173913 g NaCl

5 0

3 years ago