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Elena-2011 [213]
3 years ago
15

1.Which of the following comparison statement is true about population growth of more developed countries?

Chemistry
2 answers:
SCORPION-xisa [38]3 years ago
4 0
Hi 

the answer would be <span>
B.Less developed countries do not have access to safe and reliable family-planning and health care as do more developed countries.

hope this helps</span>
Anna007 [38]3 years ago
3 0

Answer:

The correct answer is B. Less developed countries do not have access to safe and reliable family-planning and health care as do more developed countries.

Explanation:

In general, less developed countries have higher population growth rates than developed countries do. This is because these countries lack developed medical centers capable of guiding their populations in terms of family planning, which means that pregnancy rates are higher due to ignorance and lack of availability of contraceptive methods. Likewise, these countries have high mortality rates, with which life expectancy tends to be lower than that of developed countries; This is also explained in the deficiencies of their health systems.

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15.0 g of cream at 16.4 °C are added to an insulated cup containing 100.0 g of coffee at 86.5 °C. Calculate the equilibrium temp
Marta_Voda [28]
115 grams total

15/115= 13%

109/115= 87%

.13x 16.4= .277

.87x 86.5= 75.255

75.255+.277= 75.532 deg C
or 75.5 as 3 significant digits
7 0
3 years ago
A student combines 364.6 g of HCl with 80 g of NaOH in 5 L of water. What additional volume of H2O must be added to this mixture
Jobisdone [24]

Answer:

75L of additional water to have a pH 1 solution

Explanation:

The reaction of HCl With NaOH is:

HCl + NaOH → H₂O + NaCl

By using molar mass of each reactant you can know how many moles will react, thus:

HCl: 364.6g HCl ₓ (1mol / 36.46g) = 10 moles HCl

NaOH: 80g NaOH ₓ (1mol / 40g) = 2 moles NaOH

That means after the reaction will remain in solution, 10-2 = 8 moles of HCl = 8 moles of H⁺ (In water, HCl dissociates as H⁺ and Cl⁻ ions).

A solution with pH = 1 contains:

pH = -log [H⁺]

1 = -log [H⁺]

0.1M = [H⁺]

As molarity, M is the ratio between moles and liters and you want a solution 0.1M having 8 moles of H⁺ you require:

0.1M = 8 moles H⁺ / 80L

As the student combines the solution with 5L of water, you require

<h3>75L of additional water to have a pH 1 solution</h3>
6 0
3 years ago
If there is 5 atoms of oxygen in the reactant, how many oxygen atoms must be in the product​
tiny-mole [99]

Answer:

5

Explanation:

It requires 20 chracters to fill this answer

4 0
3 years ago
how will knowing the density of a substance help you determine whether an object made from that material will float in water
trapecia [35]
The density of water is about 1kg/m³, therefore is the substance has a density of less than 1kg/m³ then it will most likely float however if it is more than 1kg/m³ then it will most likely sink.
4 0
4 years ago
Read 2 more answers
1. What causes water's low vapor pressure? (1 point)
arsen [322]
<span>1. What causes water's low vapor pressure? (1 point)
dispersion forces
dispersion forces
covalent bonding
hydrogen bonding
ionic attractions
2. Which of the following substances is the most soluble in water? (1 point)
sodium chloride
methane
bromine
carbon
3. Which of the following substances is NOT an electrolyte? (1 point)
KCl
CCl4
LiCl
Na2SO4
4. Which of the following mixture types can be filtered to remove solute? (1 point)
suspensions only
colloids only
suspensions and colloids
suspensions and solutions
5. Which of the following mixtures is NOT a colloid? (1 point)
fog
milk
paint
sugar water
6. Which of the following types of mixtures exhibit the Tyndall effect? (1 point)
suspensions and colloids
suspensions and solutions
colloids and solutions
colloids only
7. An emulsyfying agent is typically characterized by having ____. (1 point)
one polar end
one nonpolar end
one nonpolar end
two polar ends
one polar end and one nonpolar end</span>
5 0
4 years ago
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