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
nalin [4]
3 years ago
13

Mrs. Johnson's science class perform an experiment. They combine two substances that react with lots of fizzing and bubbling. Th

e class determines the mass of the substances before and after the experiment and find that the substances have less mass after the experiment. Hannah wants to know why the experiment didn't obey the law of conservation of mass, but Chris says it did. Who is right and why?
Hannah is right because the class may have made an error in determining the mass of the substances.


Chris is correct because the reactants and products do not have to have the same mass, but they do have to weigh the same.


Hannah is right because the mass of the reactants was different than the mass of the products.


Chris is right because some of the mass of the reactants escaped as gas.
Chemistry
2 answers:
Liono4ka [1.6K]3 years ago
7 0

Answer is: Chris is right because some of the mass of the reactants escaped as gas.

Conservation of mass (mass is never lost or gained in chemical reactions), during chemical reaction no particles are created or destroyed, the atoms are rearranged from the reactants to the products.

Gas that escaped is probably carbon(IV) oxide, so the mass of product measured is less than reactants. If mass of gas is also measured, masses of reactants and products are the same.

s2008m [1.1K]3 years ago
3 0

Chris is correct because the reactants and products do not have to have the same mass, but they do have to weigh the same.  Is the correct answer:) Hannah is right because the mass of the reactants was different than the mass of the products. is incorrect

You might be interested in
If I have a 50 liter container that holds 45 moles of gas at a temperature of 200 0C, what is the pressure inside the container?
Bezzdna [24]

hdhjdbdhjssnmsmsnsjsbxbhow?

8 0
3 years ago
Jerry listed the following process on his notebook:
topjm [15]

Answer:

2

Explanation:

1. The dew is formed when the water vapor at the atmosphere contacts the leaves, which are at a low temperature, so, the vapor temperature decreases, and the liquid is formed. So, it's a gas to liquid change.

2. Ice cubes are at the solid-state, thus this transformation is solid to a liquid change.

3. The cold juice is at a low temperature, so when the water vapor of the air contacts with the glass, its temperature decreases, and its change to a liquid phase. So, it's a gas to liquid change.

4. The evaporated water from the Earth's surface goes to the atmosphere, and, at high altitudes, the temperature is low, so the water vapor condenses and the drops get closer together forming the clouds. So, it's a gas to a liquid change.

5 0
2 years ago
Is MgS ionic or covalent
Keith_Richards [23]

Answer:

Ionic

Explanation:

Mg has 2 electron in it's outermost orbit, by donating this two electron to Sulfur it get stable mg 2+ electronic configuration while sulfur has 6 electron in it's outermost shell ,so sulfur accept this 2 electron and complete it's octet and become s2–.

6 0
2 years ago
Which of the following [H+] values describes the most basic (alkaline) solution?
Aleks04 [339]
The H+ concentration that would best describe a basic solution would be the one having values less than 10^-7. The pH of a solution is related to H+ concentration by pH = -log[H+]. Therefore, as the concentration of H+ decreases the alkalinity would rise. 
4 0
3 years ago
Which of the following is NOT an example of a Heterogeneous Mixture?
yuradex [85]

Answer:

pretty sure its table salt

5 0
2 years ago
Read 2 more answers
Other questions:
  • KF is a strong electrolyte, & HF is a weak electrolyte. How are they different?
    9·1 answer
  • Two samples of carbon tetrachloride were decomposed into their constituent elements. One sample produced 38.9 g of carbon and 45
    7·1 answer
  • 1. Calculate the heat change associated with cooling a 350.0 g aluminum bar from
    14·1 answer
  • Balance the combustion reaction between octane and oxygen. 2C8H18 + O2 → CO2 + H2O
    12·2 answers
  • Which has more atoms: 1 mole of hydrogen atoms or 1 mole of carbon-12 atoms?
    6·1 answer
  • 49 points! Will mark brainliest!
    11·2 answers
  • Hii pls help me to balance the equation and state the symbols thanksss​
    15·1 answer
  • Yo why do females have to be so heartless to a guy who really put they all in for her?
    15·2 answers
  • Which of the following would increase the intensity of the tornado?
    11·1 answer
  • Which statement best describes an O3 molecule?<br> ► View Available Hint(s)
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!