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
likoan [24]
2 years ago
7

1. What is one of the important roles of tropical rainforests in the earth's environment?

Chemistry
1 answer:
Makovka662 [10]2 years ago
3 0

Answer:

1.D

2.C

3.D

4.D

5.C

6 B

those are the answers, we must take care of our environment

You might be interested in
3. Light acts like (1 point)
alexandr402 [8]
Both a particle and a wave?
6 0
3 years ago
What is true about elements that are in the same column group or family
shusha [124]

The given question is incomplete. The complete question is:

Which is true of Elements on a periodic table in the same group (family)?

A; Elements in the same family have similar chemical properties because they have the same number of electron shells.

B; Elements in the same family have similar chemical properties because they have the same number of valence electrons.

C; Elements in the same family have few similar properties as they have different numbers of electron shells.

D; Elements in the same family are always the same type of Elements and have the same number of protons.

Answer: B; Elements in the same family have similar chemical properties because they have the same number of valence electrons.

Explanation:

Elements are distributed in groups and periods in a periodic table.

Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons. The chemical reactivity of elements is governed by the valence electrons present in the element.

Example: Flourine, chlorine and bromine are elements which belong to Group 17. They have 9, 17 and 35 electrons respectively and contain 7 valence electrons each and need one electron to complete their octet.

3 0
2 years ago
Choose the phrase that best describes h20
Kitty [74]
I need the answers or a picture to help
6 0
3 years ago
It was calculated that 4.3mL of 0.417 M HCl is required to titrate 11.9 mL of 0.151 M Mg(OH)2. Show evidence 2 HCl(aq) + Mg(OH)2
Lapatulllka [165]

Answer:

See explanation.

Explanation:

Hello,

In this case, for the described chemical reaction:

2 HCl(aq) + Mg(OH)2(aq) → MgCl2(aq) + 2 H2O(l)

We can notice there is a 2:1 molar ratio between the moles of hydrochloric acid and magnesium hydroxide, therefore, at the equivalence point:

n_{HCl}=2*n_{Mg(OH)_2}

And in terms of volumes and concentrations we verify:

V_{HCl}M_{HCl}=2*V_{Mg(OH)_2}M_{Mg(OH)_2}

So we use the given data to proof it:

4.3mL*0.417M=2*11.9mL*0.151M\\1.793=3.594

Therefore, we can conclude the data is wrong by means of the 2:1 mole ratio that for sure was not taken into account. This is also supported by the fact that normalities are actually the same, but the nomality of magnesium hydroxide is the half of the hydrochloric acid normality since the acid is monoprotic and the base has two hydroxyl ions.

Best regards.

4 0
2 years ago
What are the five main points of kinetic theory of gas?​
jekas [21]

Answer:

2) Gas molecules do not have preferred direction of motion, their motion is completely random. 3) Gas molecules travels in straight line. 4) The time interval of collision between any two gas molecules is very small. 5) The collision between gas molecules and the walls of container is perfectly elastic.

3 0
2 years ago
Read 2 more answers
Other questions:
  • From left to right, the three regions of a phase diagram represent the _____ of a substance.
    6·2 answers
  • 2H2 + O2 → 2H2O
    10·1 answer
  • A potassium iodide compound is represented by which formula?
    13·2 answers
  • On a warm summer day in Oslo, the temperature is 21 degree C and the relative humidity is 70%. What is the absolute humidity? Wh
    14·1 answer
  • ¿Qué volumen ocuparán 12 g de hierro?
    11·1 answer
  • Calculate the volume in cm^3 of 325.0 dg of alcohol. Alcohol has a density of 0.785g/mL.
    12·1 answer
  • ¿Qué son los lantánidos y actínidos?
    10·1 answer
  • 15. What type of energy changes the physical states of matter?
    12·1 answer
  • 1) A book is pushed and released and it slides across a table for a short distance The book quickly comes to a stop. The book or
    7·1 answer
  • How many grams are in 3.45 moles CO2
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!