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
oee [108]
3 years ago
13

Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas.

She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption? A. fact B. hypothesis C. law D. observation E. theory
Chemistry
1 answer:
Helga [31]3 years ago
5 0

Answer:

The correct answer is B. Hypothesis

Explanation:

You might be interested in
You heat 3.869 g of a mixture of fe3o4 and feo to form 4.141 g fe2o3. What is the mass of oxygen reacted?
Lostsunrise [7]

The reaction is  

FeO + Fe3O4 + 1/2 O2---> 2Fe2O3

Thus as shown in the balanced equation two moles of Fe2O3 are formed when 0.5 moles of O2 reacted with mixture of FeO and Fe3O4

moles of Fe2O3 = MAss / Molar mass = 4.141 / 159.69 = 0.0259 moles

So moles of O2 needed = 0.5 X 0.0259 = 0.01295

Mass of O2 = moles X molar mass = 0.01295 X 32 = 0.4144 grams

5 0
3 years ago
What is most likely to refract a beam of light ?
Lorico [155]

Answer:

change in speed

Explanation:

if a substance causes the light to speed up or slow down more, it will refract more.

3 0
3 years ago
A cube of iron at 20C is placed in contact with a cube of copper at 60C. Which statement describes the initial flow of heat betw
Anestetic [448]

Answer:

the iron is more condensed then the copper more electricity

7 0
3 years ago
What name was given to noxious vapour, rising from organic matter, which pollutes the atmosphere??
Flauer [41]
The noxious vapor that rises from organic matter is known as methane. Methane is one of the greatest contributors to the greenhouse effect, and one of the greatest sources of methane on the planet is from cattle farms. Cattle produce tons of methane per year, and there are massive cattle farms across the globe to keep up with the demand of milk and red meat.
4 0
3 years ago
Arteries
Andrews [41]

Answer:

carry blood away from the heart

8 0
3 years ago
Other questions:
  • Amy is in a car moving quickly toward a stationary siren. Just as Amy moves
    11·1 answer
  • Steps for Seperating mixtures flowers peteale water and sugar
    9·1 answer
  • Some soils, like clay, hold water tightly. Other soils, like sand, let the water run through. What property of soils is MOST IMP
    10·1 answer
  • What part of the water cycle involves the leaves of plants
    5·1 answer
  • HELP! What is the percent composition of carbon in caffeine (C₈H₁₀N₄O₂)? Show your work
    11·1 answer
  • Which of the following is NOT a homogeneous mixture? *<br> koolaid<br> soda<br> tea<br> water
    5·1 answer
  • Which atomic property is different in each isotope of an element?
    14·1 answer
  • A solid has shape and volume?
    15·1 answer
  • Which describes the characteristics of a rain shadow on a mountainside?(1 point)
    12·2 answers
  • If 5. 0 grams of kcl is dissolved in 500 ml of water, what is the concentration of the resulting solution?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!