All categories

2 years ago

50 points / will mark BRAINLIEST IF ANSWERED quickly!

Chemistry

1 answer:

liberstina [14]2 years ago

4 0

Answer:

1. density-dependent factors - competition, predation, parasitism, and disease.

density-independent factors- natural disasters, seasonal cycles, unusual weather, and human activity

As populations increase in size, completion increase as well. For example more people more food demands. as populations become larger and more and more crowded people compete for food, water, sunlight, spaces to live and so on.

Example:

A prolonged drought, with its associated crop loss could cause deaths, financial hardship, and emigration to other areas.

both are under pressure to change in ways that reduce competition, may evolve to occupy different niches

parasites take nourishment from a host - weakening it / killing it

favorable conditions: agriculture, medicine, industry, sanitation

It equal age distribution = very slow, steady growth

large % of children and teenagers = very rapid growth

the recourse may be a part of a organism's niche/habitat (ex. panda and bamboo)

Density (d) depends upon the mass (m) and volume (v) of a substance. The mass depends upon the amount of matter in a substance, whereas volume is the amount of space that a substance takes up.

You might be interested in

Hellppppp

Margaret [11]

Answer:

Explanation:

you don't think of particles as dense and less dense

dust particles containvenergy but won't release it unless acted upon a force

gas molecules move freely and collide with dust particles which is correct

8 0

2 years ago

How does density differ from concentration?

Aliun [14]

The main difference between concentration and density is that concentration refers to how much of a substance is present in a mixture, whereas density refers to the mass of a substance per unit volume.

4 0

2 years ago

Number 14? Please :)

ASHA 777 [7]

Evaporated is the answer

4 0

2 years ago

The flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.160 M NaOH. It requires 18.

olchik [2.2K]

Answer:

Approximately $0.291\; \rm M$ (rounded to two significant figures.)

Explanation:

The unit of concentration $\rm M$ is the same as $\rm mol \cdot L^{-1}$ (moles per liter.) On the other hand, the volume of both the $\rm NaOH$ solution and the original $\rm HCl$ solution here are in milliliters. Convert these two volumes to liters:

$V(\mathrm{NaOH}) = 18.2\; \rm mL = 18.2 \times 10^{-3}\; \rm L = 0.0182\; \rm L$ .
$V(\text{$\mathrm{HCl}$, original}) = 10.0\; \rm mL = 10.0\times 10^{-3}\; \rm L = 0.0100\; \rm L$ .

Calculate the number of moles of $\rm NaOH$ in that $0.0182\; \rm L$ of $0.160\; \rm M$ solution:

$\begin{aligned} n(\mathrm{NaOH}) &= c(\mathrm{NaOH})\cdot V(\mathrm{NaOH})\\ &= 0.160\; \rm mol \cdot L^{-1} \times 0.0182\; \rm L \approx 0.00291\; \rm mol\end{aligned}$ .

$\rm HCl$ reacts with $\rm NaOH$ at a one-to-one ratio:

$\rm HCl\; (aq) + NaOH\; (aq) \to NaCl\; (aq) + H_2O\; (l)$ .

Coefficient ratio:

$\displaystyle \frac{n(\mathrm{HCl})}{n(\mathrm{NaOH})} = 1$ .

In other words, one mole of $\rm NaOH$ would neutralize exactly one mole of $\rm HCl$ . In this titration, $0.291\; \rm mol$ of $\rm NaOH\!$ was required. Therefore, the same amount of $\rm HC$ should be present in the original solution:

$\begin{aligned}&n(\text{$\mathrm{HCl}$, original})\\ &= n(\mathrm{NaOH})\cdot \frac{n(\mathrm{HCl})}{n(\mathrm{NaOH})} \\ &\approx 0.00291\; \rm mol \times 1 = 0.00291\; \rm mol\end{aligned}$ .

Calculate the concentration of the original $\rm HCl$ solution:

$\displaystyle c(\text{$\mathrm{HCl}$, original}) = \frac{n(\text{$\mathrm{HCl}$, original})}{V(\text{$\mathrm{HCl}$, original})} \approx \frac{0.00291\; \rm mol}{0.0100\; \rm L} \approx 0.291\; \rm M$ .

5 0

2 years ago

How are t cells and b cells same

tigry1 [53]

T cells and B cells are similar because they both deal with fighting of viruses.

5 0

2 years ago

Read 2 more answers