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
garri49 [273]
3 years ago
10

When placed in a freezer, liquid water turns into solid ice. Why is this considered a physical change? A. The physical structure

of the water molecules change as bonds are broken and atoms are rearranged.. B. Only the motion and arrangement of the particles changes, not the identity of the substance.. C. The water molecules react when exposed to the cold temperature, causing the atoms to separate.. D. Only the arrangement of the atoms within the molecules changes, not the distance between them
Chemistry
2 answers:
avanturin [10]3 years ago
6 0

<span>A physical change changes the bonds between molecules of the substance. so option a is right.</span>
oksian1 [2.3K]3 years ago
3 0
B. Only the motion and arrangement of the particles changes, not the identity of the substance
You might be interested in
Ammonium nitrate is an ingredient in cold packs used by sports trainers for injured athletes. Calculate the change in temperatur
Ronch [10]

Answer:

See explanation

Explanation:

First, we need to use the correct expression:

Q = m*Cp*ΔT  (1)

Q = n*ΔH  (2)

These are the 2 expressions to calculate heat or energy.

Now, we want to know the change of temperature of the nitrate in water after being added, so with the innitial data of nitrate, we can calculate heat using the second expression. First, we need to calculate moles with the molecular mass:

n = m/MM

n = 42/80.1 = 0.52 moles

With these moles, we can calculate heat with the ΔH of this reaction:

Q = 0.52 * 25.7 = 13.364 kJ or 13,364 J

However, this heat as is being absorbed, the value would be negative.

Now that we have heat, we can use expression (1) and plug these values to solve for ΔT, but before, we need to know the total mass of the solution (water + nitrate)

m = 250 + 42 = 292 g

now, solving for ΔT:

-13,364 = 292 * 4.18 * ΔT

ΔT = -13,363 / (292 * 4.18)

ΔT = -10.95 °C

3 0
3 years ago
Elements within the same group of the periodic table behave similarly because they have the same number of ?
sammy [17]
The elements in each group have the same number of electrons in the outer orbital. Or also called valence electrons. Khan academy has a great video online explaining why this happens. (It only happens for main group elements). Here is a link (sorry you can’t click it in Brainly) https://www.khanacademy.org/science/chemistry/periodic-table/copy-of-periodic-table-of-elements/v/periodic-table-valence-electrons. Feel free to message me for a better explanation, I would explain now but I’m not sure how much you know about this. If you know how to write an electron configuration you can see how all the electron configurations for the same group (not the transitional metals only the main groups) have the same number of valence electrons. I hope that helped, sorry I was vague about the explanation :)
4 0
2 years ago
What pressure will be exerted by 25 g of CO2 at temperature of 25°C and a volume of .50 L?
Grace [21]

Answer:

P = 27.9 atm

Explanation:

Given data:

Mass of CO₂ = 25 g

Temperature = 25°C (25+273.15 K = 298.15 K)

Volume of gas = 0.50 L

Pressure of gas = ?

Solution:

Firs of all we will calculate the number of moles of gas,

Number of moles = mass/molar mass

Number of moles = 25 g/ 44 g/mol

Number of moles = 0.57 mol

Pressure of gas :

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

P × 0.50 L = 0.57 mol × 0.0821 atm.L/ mol.K  × 298.15 K

P = 13.95 atm.L/ 0.50 L

P = 27.9 atm

4 0
3 years ago
Cómo escribir el símbolo Theta
Pani-rosa [81]
Para escribir el símbolo theta, presione 03B8 + Alt + X.
8 0
2 years ago
Read 2 more answers
Help! help! plz............
zhuklara [117]
There the picture is the answer from the internet

8 0
3 years ago
Other questions:
  • A 10kg bowling ball would require what force to accelerate down an alleyway at a rate of 3m/s2?
    6·1 answer
  • How many atoms of oxygen are in 0.100 mol of silicon dioxide?
    15·1 answer
  • a 25 ml sample of gas is in a syringe at 22C if it was cool down to 0 C what will the volume of the gas become
    11·1 answer
  • What does the o in chemistry mean?
    8·2 answers
  • If a molecule diffusing through extracellular fluid travels 1 mm in 1 sec, how long will it take that molecule to diffuse 1 cm?
    13·1 answer
  • A chemistry student must write down in her lab notebook the concentration of a solution of potassium chloride. The concentration
    5·1 answer
  • Wadadaaaaddddddddddddddddddddddddddd
    5·1 answer
  • What is the electron ADDRESS of Chlorine
    5·1 answer
  • Which of the following gas samples would contain the same amount of gas as 200 mL of helium, He(g), at 25° C and 1 atm?
    12·1 answer
  • If a naturally occurring sample of an unidentified element is found to contain three isotopes (A, B, and C) and consists of 90.5
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!