1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
castortr0y [4]
2 years ago
6

Help I don’t understand it and I need the answers

Chemistry
1 answer:
il63 [147K]2 years ago
4 0

Answer:

Demonstration 1 showed a chemical change because a new gaseous substance was formed, and demonstration 2 showed a physical change because liquid water became water vapor.

Explanation:

Chemical changes alter the chemical makeup of a subject, and a physical change only alters the appearance of a subject, not the chemical makeup.

You might be interested in
What is the molar mass of BaBr2?
maw [93]

The answer is 297.14 g/mol

6 0
3 years ago
Read 2 more answers
A tall pea plant (Tt) is crossbred with another tall pea plant (Tt). The following Punnett square shows the separated alleles fo
Luba_88 [7]

Answer:

B.

Explanation:

when you use punnett squares, you cross the different genes with themselves. if T is in the first box on both sides, the genome will be TT. if the box lines up to tt, it will be tt. the boxes on the left use the genes' first letter and the boxes on the right use the second letter.

7 0
3 years ago
Read 2 more answers
"What is the change of entropy for 3.0 kg of water when the 3.0 kg of water is changed to ice at 0"
Artyom0805 [142]

Q: What is the change of entropy for 3.0 kg of water when the 3.0 kg of water is changed to ice at 0 °C? (Lf = 3.34 x 105 J/kg)

Answer:

-3670.33 J/K

Explanation:

Entropy: This can be defined as the degree of randomness or disorderliness of a substance. The S.I unit of Entropy is J/K.

Mathematically,  change of Entropy can be expressed as,

ΔS = ΔH/T ....................................... Equation 1

Where ΔS = Change of entropy, ΔH = heat change, T = temperature.

ΔH = -(Lf×m).................................... Equation 2

Note: ΔH is negative because heat is lost.

Where Lf = latent heat of ice = 3.34×10⁵ J/kg, m = 3.0 kg, m = mass of water = 3.0 kg

Substitute into equation

ΔH = -(3.34×10⁵×3.0)

ΔH = - 1002000 J.

But T = 0 °C = (0+273) K = 273 K.

Substitute into equation 1

ΔS = -1002000/273

ΔS = -3670.33 J/K

Note: The negative value of ΔS shows that the entropy of water decreases when it is changed to ice at 0 °C

4 0
3 years ago
The total number of electrons in one mole of fluorine molecules (F2) is
galben [10]
Has 9 protons and 9 electrons in per atom.........
3 0
3 years ago
Read 2 more answers
Is the continental crust less dense or more dense ?
zheka24 [161]

Answer:

It is less dense. It is also less dense than the oceanic crust.

Hope this helps and if it did, please mark brainliest!

4 0
3 years ago
Read 2 more answers
Other questions:
  • WHAT ARE NEWTON'S 3 LAW'S
    12·1 answer
  • What is valence electrons​
    6·1 answer
  • Can I get some help please I’m lost :(
    10·1 answer
  • Chlorine has two isotopes. Chlorine-35 has an actual mass of 34.9689 u and chlorine-37 has a mass of 36.9659 u. In any sample of
    11·1 answer
  • What causes weather?
    14·1 answer
  • Calculate the density (in grams per milliliter) of the following gas at 97 °C and 755 mm Hg Sulfur dioxide (SO2)
    5·1 answer
  • How many mole of HCL is produced if 4g of hydrogen is completely reacted with chlorine​
    15·1 answer
  • Whats the awnser? i cant find it and i need it asap! anyone i will crown you the brainleist!
    15·1 answer
  • Which element can form an oxide with the general formula m2o or mo where m is a metal
    9·1 answer
  • Zinc nitrate can be produced by reacting an acid and a metal oxide.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!