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
exis [7]
3 years ago
5

50 POINTS: PLEASE ANSWER AS QUICK AS POSSIBLE!

Chemistry
2 answers:
Dvinal [7]3 years ago
6 0

Explanation:

The lack of a control group

____ [38]3 years ago
5 0
The answer would be “the lack of a control group.” To make the results more accurate, the scientists should have used a placebo group to use as a comparison.
You might be interested in
Which one is unsaturated hydrocarbon?
Fittoniya [83]

Answer:

The correct answer is - D C2H4.

Explanation:

Saturated hydrocarbons are hydrocarbons with single covalent C-C bonds. They are known as alkanes. The general formula for these hydrocarbons is  CnH2n+2

Unsaturated hydrocarbons the hydrocarbons with double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is  CnH2n and CnHn-2

For the given options:

Option D: C2H4, is the simplest alkene with a double bond so it is an unsaturated hydrocarbon.

6 0
3 years ago
Which of the following has more atoms?
aniked [119]

Answer:

They all have the same number of atoms

Explanation:

Which of the following has more atoms?

One mole of zinc

One mole of gold

One mole of silver

One mole of magnesium contians  

O They all have the same number of atomst

a mole of anything contains Avogadros number of 6.022X10^23  things

which has the greatest number of thing? a dozen eggs, a dozen cookies, a dozen pizzas?

a dozen is a number means 12

a mole is a number that that means 6.022 X 10^23 you calculate the molar mass from the chemical formula, but every j mole contains 6.022X10^23

particles.

just like every dozen contains 12

so

They all have the same number of atoms

3 0
3 years ago
what biome has many nocturnal animals that burrow underground during the day that are active at night
hram777 [196]

Answer:

it could be maybe a raccoon or a possum

Explanation:

4 0
3 years ago
Will Mark Brainlest ( all the disaster are hazard but all the hazard are not disaster​) give reason
Svetlanka [38]

Answer:

Explanation to the following question is as follows;

Explanation:

Any phenomenon that would have the potential to cause severe death or property damage is considered a danger. When the potential for devastation is realised, a hazard becomes a disaster. All catastrophes are risks, but not all risks are catastrophes. Hazards do not always result in devastation.

5 0
3 years ago
Read 2 more answers
What are things that we use that are made of the elements on the periodic table
mylen [45]

Answer:

all matter (everything) is made of the elements on the periodic table

Explanation:

6 0
2 years ago
Other questions:
  • A 5 kg block
    11·1 answer
  • PLS ANSWER!!!!
    11·1 answer
  • The question is below
    5·1 answer
  • Each step in the following process has a yield of 90.0 %. CH 4 + 4 Cl 2 ⟶ CCl 4 + 4 HCl CCl 4 + 2 HF ⟶ CCl 2 F 2 + 2 HCl The CCl
    12·1 answer
  • I need help please thanks
    5·1 answer
  • 9.86 x 10²⁸ O-atoms require what volume (L) N₂O₂ at STP?
    8·1 answer
  • What is the density of fluorine gas, F2, at STP? E) 0.848 g/L B) 1.18 g/ L C ) 1.70 g/L D) 0.589 g/L
    15·1 answer
  • In an experiment between 26.4 grams of Mg and O,, Mgo is produced. The percent
    13·1 answer
  • Someone pls help me I will mark you as brain
    5·1 answer
  • Why are saturated solutions not stable?​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!