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3 years ago

describe the interaction between the farmer and manufactured objects, such as farming equipment. how does energy flow ?

1 answer:

5 0

Answer: The farmer spends the energy obtained from food as he works with his equipment. He might build a shed, plow his field, harvest crops, or even drive to town to pick up supplies.

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coldgirl [10]

Answer:

0.895 g/mL

Explanation:

Step 1: Given data

Mass of liquid Z (m): 2.763 lb

Volume of liquid Z (V): 5.93 cups

Step 2: Convert "m" to grams

We will use the relationship 1 lb = 453.59 g.

$2.763 lb \times \frac{453.59 g}{1lb} = 1,253g$

Step 3: Convert "V" to milliliters

We will use the relationship 1 cup = 236.59 mL.

$5.93cup \times \frac{236.59mL}{1cup} = 1.40 \times 10^{3} mL$

Step 4: Calculate the density of the liquid Z

The density (ρ) of the liquid Z is equal to its mass divided by its volume.

$\rho = \frac{m}{V} = \frac{1,253g}{1.40 \times 10^{3}mL } = 0.895 g/mL$

4 0

3 years ago

Calculate the percent ionization of benzoic acid at the following concentrations. (a) 0.32 M WebAssign will check your answer fo

seraphim [82]

Answer: a) 1.4 %

b) 48%

Explanation:

$C_7H_6O_2\rightarrow H^+C_7H_5O_2^-$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

a) Given c= 0.32M and $K_a=6.3\times 10^{-5}$

$\alpha$ = ?

Putting in the values we get:

$6.3\times 10^{-5}=\frac{(0.32\times \alpha)^2}{(0.32-0.32\times \alpha)}$

$(\alpha)=0.014$

$\%(\alpha)=0.014\times 100=1.4\%$

b) Given c= 0.00014 M and $K_a=6.3\times 10^{-5}$

$\alpha$ = ?

Putting in the values we get:

$6.3\times 10^{-5}=\frac{(0.00014\times \alpha)^2}{(0.00014-0.00014\times \alpha)}$

$(\alpha)=0.48$

$\%(\alpha)=0.48\times 100=48\%$

8 0

3 years ago

When zinc reacts with sulfuric acid, as shown here, what mass of hydrogen is produced from 31.8 g of zinc?

Alina [70]

Answer:

The answer to your question is 0.98 g of H₂

Explanation:

Data

mass of H₂ = ?

mass of Zn = 31.8 g

Balanced chemical reaction

Zn + H₂SO₄ ⇒ ZnSO₄ + H₂

Process

1.- Calculate the molar mass or atomic mass of Zinc and hydrogen

The Atomic mass of zinc = 65 g

The Molar mass of H₂ = 2 g

2.- Use proportions and cross multiplication to find the mass of H₂ formed.

65 g of Zn ----------------- 2 g of H₂

31.8 g of Zn -------------- x

x = (31.8 x 2) / 65

x = 63.6/65

-Result

x = 0.98 g of H₂

3 0

3 years ago

A ___________________________ is a mixture in which the properties of thesubstances are spread evenly.

wel

Answer:

homogenous mixture

Explanation:

6 0

3 years ago

What is magma called once<br> leaves a volcano?

Vika [28.1K]

Answer:

lava

Explanation:

4 0

3 years ago