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
Afina-wow [57]
3 years ago
7

Yasir wants to determine if there is a relationship between room color and sleep. Based on his research, Yasir makes an educated

guess that people fall asleep more quickly in a room painted blue than in a room painted yellow. He asks several people which color they like better—yellow or blue—and uses their responses to determine if his educated guess was correct.
What is missing from Yasir's scientific investigation?

A testable hypothesis that is based on research
An experiment that directly tests the hypothesis
Variables to be tested by an experiment
Research on the topic to see what others have learned
Chemistry
1 answer:
Helen [10]3 years ago
8 0

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.

You might be interested in
One mechanism for the synthesis of ammonia proposes that N₂ and H₂ molecules catalytically dissociate into atoms:N₂ ⇆ 2N(g) log
Pavlova-9 [17]

The artificial fixation of nitrogen (N2) has enormous energy, environmental, and societal impact, the most important of which is the synthesis of ammonia (NH3) for fertilizers that help support nearly half of the world's population.

<h3>Artificial fixation of nitrogen</h3>

a) The equilibrium constant expression is Kp​=PCH4​​ PH2​ O​P CO​×PH 2​3​​.

(b) (i) As the pressure increases, the equilibrium will shift to the left so that less number of moles are produced.

(ii) For an exothermic reaction, with the increase in temperature, the equilibrium will shift in the backward direction.

(iii) When a catalyst is used, the equilibrium is not disturbed. The equilibrium is quickly attained

To learn more about equilibrium constant visit the link

brainly.com/question/10038290

#SPJ4

6 0
1 year ago
Which type of worm has a body that is divided into many ring-like parts?
yan [13]
Annelid im pretty sure
8 0
3 years ago
How many molecules in a mole?​
Dennis_Churaev [7]

Answer:

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.

Explanation:

hope this helped!

6 0
3 years ago
Which of the following is the best name for a compound made from calcium and bromine? (CaBr2) calcium bromide calcium dibromide
Mice21 [21]

Answer:

Calcium bromide

Explanation:

When naming compounds, the use of prefixes depend on the type of bond made. In this case, calcium and bromine form a ionic bond because calcium is a metal and bromine is a non-metal.

Ionic bonds are not named using prefixes. So no matter how many atoms there are, you will simply write the name of the element for the first element.

For the second element, you name it as well, but only use the root name and end it with -ide.

7 0
3 years ago
What is the concentration (M) of sodium ions in 4.57 L of a 0.398 M Na3PO4 solution?
____ [38]

0.398=mol/4.57L. mol= 1.818. 1.818*3=5.456. 5.456/(4.57L)=1.19 M

5 0
3 years ago
Other questions:
  • Calculate the mass of 3.5 mol C6H6
    10·1 answer
  • Which atom in the ground state has the same electron configuration as a calcium ion, Ca2+, in the ground state?(1) Ar(2) K(3) Mg
    15·2 answers
  • Properties of matter with three example each
    7·1 answer
  • Explain why vanadium (radius=134 pm) and copper (radius=128 pm) have nearly identical atomic radii, even though the atomic numbe
    12·1 answer
  • _____ was Isaac Newton’s first contribution to the scientific community.
    7·2 answers
  • If a carbon hydrate has 2n possible isomers, where n is equal to the number of carbon atoms in the carbon hydrate structure that
    6·1 answer
  • Which best describes the difference between Mitosis and Meiosis?
    9·1 answer
  • What happens when waves travel down
    12·1 answer
  • If the initial volume is 55ml and the final volume after some rocks of sandstone are added is 65ml what is the volume of the chi
    9·1 answer
  • NEED IT ASAP!PLEASE HURRY
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!