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
AleksAgata [21]
3 years ago
15

Which are characteristics of scientific questions? Check all that apply.

Chemistry
2 answers:
galina1969 [7]3 years ago
4 0

Answer:

asking about subjective matters

possibly leading to a testable hypothesis

addressing a gap in knowledge

I got soo confused about that last part. I didn't know if that was an option or something you needed to be answered.

Descriptive investigations are not repeatable because they are based only on observations made at a single point in time. The results may vary at a different time. In addition, descriptive investigations do not contain variables that may indicate cause-and-effect relationships.

Leona [35]3 years ago
4 0

Answer:

A C D

Explanation:

You might be interested in
If a 500 ml sample of water contains 2.6 x 10-6 g of iron, what is the concentration of iron in ppb?
Anastasy [175]

The concentration of iron in ppb is 5.2 ppb

In atmospheric chemistry, PPM( parts per million) and PPB( parts per billion) units are used to express the concentration of gases. PPB stands for parts per billion, while PPM stands for parts of gas per million parts of air.

2.6 × 10⁻⁶ grams of iron in 500 ml of water.

Now, converting milliliter into liter:

500 mL = 500 mL × ( 1L / 1000 mL ) = 0.5 L

Now for ppm, mass must be in mg.

2.6 × 10⁻⁶ grams = 2.6 × 10⁻⁶ grams × ( 1000 mg / 1 grams ) = 2.6 × 10⁻³ mg

Then, the concentration of iron in ppm will be:

2.6 × 10⁻³ mg / 0.5 L = 5.2 × 10⁻³ ppm

Now, 1 ppm = 1000 ppb

Therefore,

5.2 × 10⁻³ ppm × 10³ = 5.2 ppb

Learn more about concentration here:

brainly.com/question/17206790#:~:text=15%20people%20helped-,Answer%3A,either%20solvent%20or%20total%20solution.

#SPJ4

8 0
1 year ago
Given these reactions, where X represents a generic metal or metalloid 1 ) H 2 ( g ) + 1 2 O 2 ( g ) ⟶ H 2 O ( g ) Δ H 1 = − 241
Mazyrski [523]

Answer:

-767,2kJ

Explanation:

It is possible to sum enthalpies of half-reactions to obtain the enthalpy of a global reaction using Hess's law. For the reactions:

1) H₂(g) + ¹/₂O₂(g) ⟶ H₂O(g) ΔH₁= −241.8 kJ

2) X(s) + 2Cl₂(g) ⟶ XCl₄(s) ΔH₂= +361.7 kJ

3) ¹/₂H₂(g) + ¹/₂Cl₂(g) ⟶ HCl (g) ΔH₃= −92.3 kJ

4) X(s) + O₂(g) ⟶ XO₂(s) ΔH₄= − 607.9 kJ

5) H₂O(g) ⟶ H₂O(l) ΔH₅= − 44.0 kJ

The sum of (4) - (2) produce:

6) XCl₄(s) + O₂(g) ⟶ XO₂(s) + 2Cl₂(g) ΔH₆ = ΔH₄ - ΔH₂ = -969,6 kJ

(6) + 4×(3):

7) XCl₄(s) + 2H₂(g) + O₂(g) ⟶ XO₂(s) + 4HCl(g) ΔH₇ = ΔH₆ + 4ΔH₃= -1338,8 kJ

(7) - 2×(1):

8) XCl₄(s) + 2H₂O(g) ⟶ XO₂(s) + 4HCl(g) ΔH₈ = ΔH₇ - 2ΔH₁= -855,2kJ

(8) - 2×(5):

9) XCl₄(s) + 2H₂O(l) ⟶ XO₂(s) + 4HCl(g) ΔH₉ = ΔH₈ - 2ΔH₅= <em>-767,2kJ</em>

I hope it helps!

6 0
3 years ago
If the kitchen door is closed, how will that affect your ability to smell cooking odors in your room?
Aleonysh [2.5K]

Answer:Even if your door is closed, you would still smell the odors because of the space under the door and the space that is needed to close the door.  

Explanation:

6 0
3 years ago
Read 2 more answers
What are the names of the two magnetic poles?
gizmo_the_mogwai [7]

What are the names of the two magnetic poles?

Ur answer is

North and South

3 0
2 years ago
Read 2 more answers
Why must sample spots be above the solvent in paper chromatography
marishachu [46]
Because if they are submerged in the solvent, they would dissolve! This would prevent them from seperating and not allow you to actually record anything
6 0
3 years ago
Other questions:
  • PLZZZZ HELP ME!!!!!!!!!!! will give brainliest and 20 points why is pinball used to describe the steps in the scientific process
    7·1 answer
  • Which action is not an accomplishment of the Apollo missions?
    13·1 answer
  • Which of the following choices represents hydrogen peroxide
    9·2 answers
  • Which conditions are necessary for a lunar eclipse to occur?
    6·2 answers
  • Iron and vanadium both have the BCC crystal structure and V forms a substitutional solid solution for concentrations up to appro
    12·1 answer
  • Carbon monoxide and chlorine combine in an equilibrium reaction to produce the highly toxic product, phosgene (COCl2 ) CO(g) Cl2
    5·1 answer
  • What is the conjugate base of the following acids?
    7·1 answer
  • Does ccl4 has resonance structures
    10·1 answer
  • Tums is a popular remedy for acid indigestion. A typical Tums tablet contains calcium carbonate mixed with inert substances. Whe
    13·1 answer
  • How many grams of CO2 are produced if 2.09 moles of hydrochloric acid are reacted with
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!