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3 years ago

Please help!

1 answer:

6 0

Pitch is sometimes defined as the fundamental frequency of a sound wave. For most practical purposes, this is fine, and pitch and frequency can be thought of as equivalent. On the other hand, for most practical purposes, amplitude can be thought of as volume.

However, technically, pitch and volume are human perceptions. Thus, our perception of pitch and volume are not solely based on frequency and amplitude respectively, but are based on a combination of both. Frequency overwhelming dictates perceived pitch, but amplitude also does have some small, small effect on our pitch perception, especially when it is very large. For example, a very loud sound can have a different perceived pitch than you would predict from its frequency alone.

Hope that helps!

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The electronegativity is 2.1 for h and 1.9 for pb. based on these electronegativities pbh4 would be expected to

Sedbober [7]

PbH4 will be formed as a result of a polar covalent bond between the H and the Pb.

Since H is more electronegative than the Pb, it is, thus, expected that the H would be able to pull the electron charge towards itself. This will result in the H being negative.

Based on this:
PbH4 would be expected to <span>have polar covalent bonds with a partial negative charges on the H atoms. </span>

8 0

3 years ago

List 4 indicators that a chemical change has probably occurred

aivan3 [116]

1. Change in color
2. Formation of bubbles
3. Formation of a precipitate
4. Begins to make an odor

6 0

3 years ago

Your teacher gives you a black powder. When you dissolve the powder in water, you see red particles that float to the top, black

ELEN [110]

Answer : The correct option is, mixture

Explanation :

Mixture : It is defined as the substance that is made by the combination of two or more different components.

Pure substance : It is defined as a substance that is made by the combination of only one type of atom or only one type of molecule.

Compound : It is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Element : It is a pure substance which is composed of atoms of similar elements.

According to the definition of mixture, black powder is a mixture because it is made by the combination of red particles that float to the top, black particles that sink to the bottom and a green color liquid.

Hence, the correct option is, mixture

3 0

3 years ago

Read 2 more answers

The net change in the multistep biochemical process of photosynthesis is that CO₂ and H₂O form glucose (C₆H₁₂O₆) and O₂. Chlorop

scoray [572]

Answer:(a) 6CO2 (g) + 6H2O (l) → C6H12O6 (s) + 6O2 (g)

(b) 5.55*10^37photons

Explanation:

(a) Here we have to write a balanced thermochemical equation for formation of 1.00 mol of glucose.

In this question it has been given that Chlorophyll absorbs light in the 600 to 700 nm region,

1st we will write a chemical equation for biochemical process of photosynthesis is that CO2 and H2O form glucose (C6H12O6) and O2.

6CO2 (g) + 6H2O (l) → C6H12O6 (s) + 6O2 (g)

The heat change off the reaction can be calculated as,

={(1 mol)(6 mol) }- {(6 mol) [H2O]}

=[1 1273.3 kJ + 6(0)] - [6 (-39.5 kJ) + 6 (-285.840 kJ)]

= 2802.74 or 2802.7 kJ

Thus the balanced equation can be written as,

6CO2 (g) + 6H2O (l) → C6H12O6 (s) + 6O2 (g) = 2802.7 kJ for 1.00 mol of glucose.

6 0

3 years ago

How does the overall charge of oxygen of -16 compare to the overall charge of oxygen -17 and oxygen -18?

nadezda [96]

Answer:

-2

The charge on an oxygen ion is -2. An oxygen atoms contain six electrons in its valence electron shell.

Explanation:

5 0

2 years ago