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
Vitek1552 [10]
3 years ago
9

Which is a physical change?

Chemistry
2 answers:
ira [324]3 years ago
4 0

Making toast is a physical change.



*** Please mark this answer as the Brainliest and leave a Thanks if I helped you! :) ***

mr Goodwill [35]3 years ago
3 0

burning wood is a physical change

You might be interested in
The loops in ptolemy’s heliocentric model , and those shown on the video , are called?
Effectus [21]

Answer:

Retrograde Motion

Explanation:

The theory that the earth revolves around the Sun is called the heliocentric theory, helio meaning 'sun' and centric meaning 'in the center.

' This theory was developed in parts by different astronomers over many years, namely Aristarchus, Copernicus, Kepler, and Galileo.

The reaction from society at the time was that the heliocentric theory was not even worth talking about.

Everyone had evidence to prove that the Earth was the center because if the sun started at one point in the morning and ended at another at night, it was common sense that we were obviously the center.

Copernicus heliocentric theory or it is also named as Sun-centred theory had accepted by Galileo.

The geocentric model is also known as geocentrism.  

5 0
3 years ago
What element is missing in the following nuclear equation? bismuth radon lead polonium
IrinaVladis [17]

Answer:

Lead

Explanation:

Lead (Pb) has atomic number 82

Ex Polonium (Po) has atomic number 84 and mass number 212

3 0
3 years ago
Scientists believe that ancient bacteria represents the first evidence of life on Earth. Which of these best describes the proce
Goryan [66]
I would probably say transformation of virus like molecules
3 0
3 years ago
Yasir wants to determine if there is a relationship between room color and sleep. Based on his research, Yasir makes an educated
Helen [10]

Answer: B. An experiment that directly tests the hypothesis

Explanation:

Yasir didn’t really test his experiment he only ask people for the opinion on which color they like so he forget to actually do the experiment therefore the answer is b.

8 0
3 years ago
If i have 340mL of a 1.5 M NaBr solution, What will the concentration be for 1000mL?
Gekata [30.6K]

Answer:

0.51M

Explanation:

Given parameters:

Initial volume of NaBr = 340mL

Initial molarity  = 1.5M

Final volume  = 1000mL

Unknown:

Final molarity = ?

Solution;

This is a dilution problem whereas the concentration of a compound changes from one to another.

In this kind of problem, we must establish that the number of moles still remains the same.

    number of moles initially before diluting = number of moles after dilution

Number of moles  = Molarity x volume

Let us find the number of moles;

          Number of moles  = initial volume x initial molarity

Convert mL to dm³;

                  1000mL  = 1dm³

                     340mL gives \frac{340}{1000}   = 0.34dm³

Number of moles  = initial volume x initial molarity  = 0.34 x 1.5 = 0.51moles

Now to find the new molarity/concentration;

               Final molarity  = \frac{number of moles}{Volume}    = \frac{0.51}{1}    = 0.51M

We can see a massive drop in molarity this is due to dilution of the initial concentration.

6 0
3 years ago
Other questions:
  • What is the specific heat of a substance if 300 J are required to raise the temperature of a 267-g sample by 12 degrees Celsius?
    15·1 answer
  • Dana wants to determine the molar mass of magnesium hydroxide, Mg(OH)2. Which calculation should she use?
    7·2 answers
  • When 2.50grams of nacl is dissolved in 2liters of water what is the concentration of the solutuon​
    13·1 answer
  • Explain why igneous rocks do not contain fossils.
    11·2 answers
  • What is the speed of a cheetah that travels 224 m in 8 Seconds
    13·1 answer
  • Help science!! *10 points*
    8·1 answer
  • ammonia reacts with oxygen to produce nitrogen monoxide and water. what volume of nitrogen monoxide will result a complete react
    10·1 answer
  • After watching the squirrels at the local park for several days, Sergei asks his science teacher the following question: “do mor
    11·2 answers
  • Which statement about the Nobel gases is most reliable
    12·1 answer
  • What is te name of P2CL7
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!