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
Semenov [28]
3 years ago
15

An experiment applies heat to a substance and produces a gas that is a new and different substance. Choose the true statement.

Chemistry
1 answer:
sergejj [24]3 years ago
7 0
Im a bit torn here, lets look at the definitions of physical and chemical changes:
physical change changes only the phase/state of a substance, but not what the substance is
chemical change is a chemical reaction where a new substance is formed and energy is given off or absorbed.
(it just started raining and it smells really nice out my window)

clearly, this cannot be just a physical reaction. i think i would be inclined to pick B. but C. could have merit as an answer too. sorry for the ambiguity x
You might be interested in
What should scentist use after completing a scientific investigation
Zinaida [17]

Answer:

An Educated Guess

Explanation:

After the scientist is done with the experiment he should do an educated guess, they use the data from the experiments to make charts and graphs to communicate the results of the experiment.  After the scientists makes the hypothesis, they perform this procedure.

4 0
3 years ago
How many molecules of hypothetical substance b are produced when 29.9g of hypothetical substance a reacts? the molar mass of sub
Andrej [43]
<span>1.15x10^24 molecules of hypothetical substance b Making the assumption that each molecule in hypothetical substance a reacts to produce a single molecule of hypothetical substance b, then the number of molecules of substance b will be the number of moles of substance a multiplied by avogadro's number. So Moles hypothetical substance a = 29.9 g / 15.7 g/mol = 1.904458599 moles This means that we should also have 1.904458599 moles of hypothetical substance b. And to get the number of atoms, multiply by 6.0221409x10^23, so: 1.904458599 * 6.0221409x10^23 = 1.146892x10^24 molecules. Rounding to 3 significant figures gives 1.15x10^24</span>
5 0
3 years ago
A gram of gold has the same _____ as a kilogram of gold.
aivan3 [116]
I believe it is density but i'm not for certain try looking it up somewhere else
5 0
3 years ago
Kemmi pipets 25.00 ml of pure 1-propanol (c3h7oh, a liquid organic alcohol) into a 100.0 ml volumetric flask. she dilutes it wit
algol13
Q1)
As Kemmi pipettes a volume of 25.00 ml of the solution
density of pure propanol is 0.803 g/ml
This means that in 1000 ml of solution - 0.803 g of pure propanol
Therefore in 25.00 ml of solution - 0.803 g x 25.00 ml / 1000 ml
                                                     = 0.0201 g
Using molar mass, number of moles can be calculated= 0.0201 g / 60.09 g/mol
                                                                                       = 3.35 x 10⁻⁴ mol
therefore the number of pure propanol moles in exactly 25.00 ml is
3.35 x 10⁻⁴ mol

Q2)
molarity is the concentration of the solution. It can be defined as the number of moles of solute per liter of solution
we know the number of moles in 25.00 ml of solution. When its diluted in a 100.00 ml volumetric flask, number of moles remain constant but now the volume over which the moles of solute are dissolved is increased.
therefore number of moles = 3.35 x 10^(-4) mol
volume over which its dissolved - 100.00 / 10³ dm³
                                                    = 1.0000 x10⁻¹ dm³
the molarity = 3.35 x 10⁻⁴ mol / 1.0000 x10⁻¹ dm³
                    = 3.35 x 10⁻³ mol/dm³
5 0
4 years ago
What kingdom would an organism be in if it was unicellular and contained no nucleus
Ksivusya [100]
Kingdom Monera, organisms in this Kingdom are prokaryotes, they don't have a nuclear envelope, thus they have a nucleoid. 

7 0
3 years ago
Other questions:
  • A 65 kg diver jumps off a 10 m platform.
    12·1 answer
  • Select the correct answer. A certain reaction has this form: aA bB. At a particular temperature and [A]0 = 2.00 x 10-2 Molar, co
    12·1 answer
  • Explain why two thin sweaters feel warmer then one thick sweater​
    10·1 answer
  • What might cause your stomach pH to become more acidic than normal
    6·1 answer
  • How to unscramble dtneinreigs
    8·2 answers
  • 2) A wooden block has a volume of 176 cm3 and a density of 18.2 g/ cm3. What is the mass?
    14·1 answer
  • 3. Which of the rocks from the table would be classified as metamorphic rocks?
    5·1 answer
  • What happens when fats are oxidised?​
    14·2 answers
  • Why do we use the mole concept ??
    10·2 answers
  • The experimental apparatus represented above is used to demonstrate the rates at which gases diffuse. When the cotton balls are
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!