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
aliina [53]
3 years ago
13

What is a cause of human population decrease

Chemistry
2 answers:
anzhelika [568]3 years ago
4 0
Death, sickness, loss of food and homes, many things tbh
Tresset [83]3 years ago
3 0
War diseases can you give a certain year or somthing?
You might be interested in
Which property of water causes water drops to bead on a freshly waxed car?
astraxan [27]

Answer:

Cohesive forces are greater than adhesive forces  

Step-by-step explanation:

The attractive forces between water molecules and the wax on a freshly-waxed car (adhesive forces) are quite weak.

However, there are strong attractive forces (cohesive forces) between water molecules.

The water molecules are only weakly attracted to the wax, so the cohesive forces pull the water molecules together to form beads .

3 0
3 years ago
What is an oxidation state?
Oxana [17]

Answer:

Oxidation state shows the total number of electrons which have been removed from an element (a positive oxidation state) or added to an element (a negative oxidation state) to get to its present state

4 0
3 years ago
A scientist is studying the liquid shown here. She thinks the liquid is a mixture. Describe an investigation she could do to dem
Anettt [7]

Fun fact

The heads on Easter Island have bodies. ...

6 0
3 years ago
Read 2 more answers
In each row check off the boxes that apply to the highlighted reactant. reaction The highlighted reactant acts as a... (check al
tekilochka [14]

The given question is incomplete. The complete question is :

In each row check off the boxes that apply to the underlined reactant. The underlined reactant acts as a... (check all that apply)

1. HCH_3CO_2(aq)+NH_3(aq)\rightarrow CH_3COO^-(aq)+NH_4^+(aq)

here underlined is HCH_3CO_2

A. Brønsted-Lowry acid

B. Brønsted-Lowry base

C. Lewis acid

D. Lewis base

2. BH_3(aq)+NH_3(aq)\rightarrow BH_3NH_3(aq)

Here underlined is NH_3

A. Brønsted-Lowry acid

B. Brønsted-Lowry base

C. Lewis acid

D. Lewis base

3. HNO_2(aq)+C_2H_5NH_2(aq)\rightarrow NO_2^-(aq) + C_2H_5NH_3^+(aq)

Here underlined is C_2H_5NH_2

A. Brønsted-Lowry acid

B. Brønsted-Lowry base

C. Lewis acid

D. Lewis base

Answer: 1. Brønsted-Lowry acid

2. Lewis base

3. Brønsted-Lowry base

Explanation:

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

1.  HCH_3CO_2(aq)+NH_3(aq)\rightarrow CH_3CO^{2-}(aq)+NH_4^+aq)

As HCH_3CO_2(aq) is donating a proton , it acts as a bronsted acid.

2. BH_3(aq)+NH_3(aq)\rightarrow BH_3NH_3(aq)

As NH_3 contains a lone pair of electron on nitrogen , it can easily donate electrons to BH_3 and act as lewi base.

3.  HNO_2(aq)+C_2H_5NH_2(aq)\rightarrow NO_2^-(aq) + C_2H_5NH_3^+(aq)

As C_2H_5NH_2(aq) is accepting a proton , it acts as a bronsted base.

7 0
3 years ago
If the Dry bulb reads 25 degrees Celsius and the wet bulb reads 22
Nitella [24]

Answer:

Relative humidity is low .

Explanation:

The wet bulb reads low temperature because due to low humidity of atmosphere , evaporation of water takes place from the wet bulb which makes the bulb cool and therefore it reads lower temperature . In the process of evaporation , heat equal to latent heat of vaporization is taken from the bulb and it loses temperature.

6 0
3 years ago
Other questions:
  • Solid potassium fluoride decomposes into fluorine gas and solid potassium .
    6·1 answer
  • What do the presence of fish and a wide diversity of invertebrates in a river indicate?
    8·1 answer
  • A decomposition reaction has a half life of 578 years. (a) What is the rate constant for this reaction? (b) How many years does
    11·1 answer
  • How does an enzyme’s active site relate to its substrate?
    7·2 answers
  • 4. Do the arrows you drew on Figure B represent an action force or a reaction force!
    6·1 answer
  • Wes melted some cheese over some tortilla chips to make nachos.
    11·2 answers
  • How many electrons are in an atom with the electron<br> configuration of 1s 2s 2p 3s!?
    15·1 answer
  • GAS LAW:
    5·1 answer
  • A single atom found on the periodic table is know as an
    11·1 answer
  • Viết công thức hóa học tạo bởi Mg và O
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!