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3 years ago

Which level of organization describes the tropical savanna

Chemistry

2 answers:

MrRissso [65]3 years ago

5 0

The savanna is a place, but it is not the entire biosphere.

It is a biome (A).

sergejj [24]3 years ago

4 0

Answer: A. Biome

Explanation: a biome is a certain land type, and the question doesn’t give any other information besides the tropical savanna, which is a biome

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Calculate your experimentally determined percent mass of water in Manganese(II) sulfate monohydrate. Report your result to 2 or

antoniya [11.8K]

Answer:

10.6%

Explanation:

The determined percent mass of water can be calculated from the formula of the hydrate by

dividing the mass of water in one mole of the hydrate by the molar mass of the hydrate and

multiplying this fraction by 100.

Manganese(ii) sulphate monohydrate is MnSO4 . H2O

1. Calculate the formula mass. When determining the formula mass for a hydrate, the waters of

hydration must be included.

1 Manganes 52.94 g = 63.55 g

1 Sulphur 32.07 g =

32.07 g 2 Hydrogen is = 2.02 g

4 Oygen =

64.00 g 1 Oxygen 16.00 = 16.00 g

151.01 g/mol 18.02 g/mol

Formula Mass = 151.01 + (18.02) = 169.03 g/mol

2. Divide the mass of water in one mole of the hydrate by the molar mass of the hydrate and

multiply this fraction by 100.

Percent hydration = (18.02 g /169.03 g) x (100) = 10.6%

The final result is 10.6% after the two steps calculations

4 0

3 years ago

What is the definition -deka?

Lera25 [3.4K]

The term is derived from the Greek deka (δέκα), meaning "ten" It is a prefix

8 0

3 years ago

Read 2 more answers

The diagram below shows the movement of particles what does this piece of evidence best support

fgiga [73]

Answer is: the collision theory.

The collision theory states that a certain fraction of the collisions (successful collisions) cause significant chemical change.

The successful collisions must have enough energy (activation energy), on this diagram that energy is represented with arrow up.

Chemical bonds are broken (between blue and red-black molecules) and new bonds are formed (between blue-red and blue-black molecules), as it is represented on diagram.

8 0

4 years ago

Read 2 more answers

A certain weak acid, HA, has a Ka value of 1.8×10−7. Calculate the percent ionization of HA in a 0.10 M solution. Express your a

Marta_Voda [28]

Answer: The percent ionization of HA is 0.13 %

Explanation:

We are given:

Molarity of HA solution = 0.10 M

The chemical equation for the ionization of HA follows:

$HA\rightarrow H^++A^-$

Initial: 0.1

At eqllm: (0.1-x) x x

The expression of $K_a$ for above equation follows:

$K_a=\frac{[H^+][A^-]}{[HA]}$

We are given:

$K_a=1.8\times 10^{-7}$

Putting values in above equation, we get:

$1.8\times 10^{-7}=\frac{x\times x}{0.1-x}\\\\x^2+(1.8\times 10^{-7})x-1.8\times 10^{-8}=0\\\\x=0.00013,-0.00013$

Neglecting the negative value of 'x' because concentration cannot be negative.

To calculate the percent ionization, we use the equation:

$\%\text{ ionization}=\frac{[H^+]_{eq}}{[HA]_i}\times 100$

$[H^+]_{eq}=x=0.00013M$

$[HA]_i=0.1M$

Putting values in above equation, we get:

$\%\text{ ionization}=\frac{0.00013}{0.1}\times 100\\\\\%\text{ ionization}=0.13\%$

Hence, the percent ionization of HA is 0.13 %

8 0

3 years ago

Question 13 of 25

Free_Kalibri [48]

Answer:C. Some chemicals cause cancer, whereas others have been

designed to fight it.

Explanation: Exposure to casinogens can lead to cancer this are chemicals also some chemicals(drugs) have been developed to combat the effect of cancerous cells. Hence the relationship between cancer and chemicals

4 0

3 years ago