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
musickatia [10]
2 years ago
12

NEED HELP! SCIENCE HW IS DUE IN 1 HOUR!!!!!!!!

Chemistry
1 answer:
almond37 [142]2 years ago
6 0

Answer:

hair is a physical change.

Cooking is a physical and chemical change.

Ice cream melting in the sun is a physical change.

mark me as the best if this helps you

You might be interested in
What is a proper adjective?
Alex17521 [72]
This is what a proper adjective is.

7 0
2 years ago
Which of the following is an example of poetential energy changing into kinetic energy ?
allsm [11]

B. A fruit falling from a tree.

4 0
3 years ago
Read 2 more answers
Need help with these three questions!!!​
Elis [28]

Answer:

6. In order from left to right the balanced coeficcients are,

6, 1, 2, 3

8. C_{7}H_{10}_{(l)}+6H_{(g)}=C_{7}H_{16}_{(l)

9.  In order from left to right the balanced coeficcients are,

1, 11, 7, 8

4 0
2 years ago
under certain water​ conditions, the free chlorine​ (hypochlorous acid,​ hocl) in a swimming pool decomposes according to the la
ivolga24 [154]

Answer:

1.7 ppm

Explanation:

Original amount N' = 2.6 ppm

time to testing t = 24 hr

final amount N = 2.1 ppm

Using exponential inhibited decay, we have

N = N'e^(-kt)

Where

N is the new reading

N' is the original reading

t is the decay time

k is the decay constant

Substituting, we have

2.1 = 2.6 x e^(-k x 24)

2.1 = 2.6 x e^(-24k)

0.808 = e^(-24k)

We take the natural log of both sides of the equation

Ln 0.808 = Ln (e^(-24k))

-0.213 = - 24k

K = 0.213/24 = 0.00886

After 48 hrs, the reading of free chlorine will be

N = 2.6 x e^(-0.00886 x 48)

N = 2.6 x e^(-0.425)

N = 2.6 x 0.654

N = 1.7 ppm

5 0
2 years ago
COCI2 has an effusion rate of 0.00172 m/sec. Which of the gases below would have an effusion rate of 0.00323 m/sec?
geniusboy [140]
CO por qué si y punto, chao
8 0
2 years ago
Other questions:
  • Calculate the average atomic mass of chromium. It's composition is: 83.79% with a mass of 51.94 Amy; 9.50% with a mass of 52.94
    6·1 answer
  • Please help! I need answers please!
    14·1 answer
  • A canister of acetylene has a volume of 42 l the temperature of the acetylene is 305 k and the pressure is 780 torr determined t
    14·1 answer
  • How are physical and chemical changes similar?
    13·2 answers
  • How do instantaneous speed and average speed differ?
    14·1 answer
  • The hydrolysis of ethyl acetate (CH3COOC2H5) by sodium hydroxide yields ethanol (C2H5OH) and sodium acetate (NaO2CCH3) by the re
    7·1 answer
  • Balance the Following Equations: SiCl4 + H2O = SiO2 + HCl
    8·1 answer
  • What do we know about the arrangement of atoms during a chemical reaction?
    12·2 answers
  • The reactants A and B react completely in a sealed container to form a product. What is the mass of the product of the reaction
    8·1 answer
  • What happens when a solid is dissolved into a liquid?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!