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3 years ago

How did humans create cow breeds that survive well in cold weather?

1 answer:

8 0

Answer: They identified cows that did well in cold weather and mated them. This is known as selective breeding. All the other answers either cannot work as cross-species breeds generally don't work, or they target cows that survive well in hot weather.

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At 1.00 atmosphere pressure, a certain mass of a gas has a temperature of 100oC. What will be the temperature at 1.13 atmosphere

Inessa [10]

Answer: Final temperature of the gas will be 330 K.

Explanation:

Gay-Lussac's Law: This law states that pressure is directly proportional to the temperature of the gas at constant volume and number of moles.

$P\propto T$ (At constant volume and number of moles)

${P_1\times T_1}={P_2\times T_2}$

where,

$P_1$ = initial pressure of gas = 1.00 atm

$P_2$ = final pressure of gas = 1.13 atm

$T_1$ = initial temperature of gas = $100^0C=(100+273)K=373K$ K

$T_2$ = final temperature of gas = ?

${1.00\times 373}={1.13\times T_2}$

$T_2=330K$

Therefore, the final temperature of the gas will be 330 K.

7 0

3 years ago

A 0.25-mol sample of a weak acid with an unknown Pka was combined with 10.0-mL of 3.00 M KOH, and the resulting solution was dil

Masteriza [31]

Answer : The value of $pK_a$ of the weak acid is, 4.72

Explanation :

First we have to calculate the moles of KOH.

$\text{Moles of }KOH=\text{Concentration of }KOH\times \text{Volume of solution}$

$\text{Moles of }KOH=3.00M\times 10.0mL=30mmol=0.03mol$

Now we have to calculate the value of $pK_a$ of the weak acid.

The equilibrium chemical reaction is:

$HA+KOH\rightleftharpoons HK+H_2O$

Initial moles 0.25 0.03 0

At eqm. (0.25-0.03) 0.03 0.03

= 0.22

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[HK]}{[HA]}$

Now put all the given values in this expression, we get:

$3.85=pK_a+\log (\frac{0.03}{0.22})$

$pK_a=4.72$

Therefore, the value of $pK_a$ of the weak acid is, 4.72

7 0

3 years ago

4 types of precipitation

olya-2409 [2.1K]

Answer:

rain snow sleet hail

Explanation:

8 0

3 years ago

How to measure the volume of a substance in a test tube?

Naya [18.7K]

Hello!
Answer:
<span>Calculate Density Using Volume of a Cylinder.
That is one great way to measure the volume!
Hoping this helps you! ;D</span>

6 0

3 years ago

How many moles of Al2(so4)3 can be produced from 7.25E24

rodikova [14]

12.04moles

Explanation:

Given parameters:

Number of molecules = 7.25 x 10²⁴molecules

unknown:

Number of moles = ?

Solution:

The moles of a substance is the amount of substance that contains avogadro's number of particles:

1 mole of a substance = 6.02 x 10²³

x moles of the compound will contain: $\frac{7.25 x 10[tex]^{24}$ }{6.02 x 10 $^{23}$ }[/tex] = 12.04moles

This gives 12.04moles

Learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

5 0

3 years ago