Chemical bondsa. are always ionic.
b. combine compounds to form elements.
c. are always covalent.
d. hold atoms together to form compounds.

. A pyramid of numbers differs from an ecological pyramid because it
a. shows the amount of energy within each trophic level.
b. displays the number of organisms at each trophic level.
c. is organized by trophic levels, while an ecological pyramid isn't.
d. attempts to describe a food chain or food web.

Answers

Answer 1
Answer: Chemical bonds hold atoms together to form compounds through the sharing of electrons or the transferring of electrons. 
Bio is not my strongest subject, but I am pretty sure that a pyramid of numbers differs from an ecological pyramid because it displays the number of organisms at each trophic level
Answer 2
Answer:

D. displays the number of organisms at each trophic level.

Hope I was helpful :)


Related Questions

If one body is positively charged and another body is negatively charged, free electrons tend to A. move from the negatively charged body to the positively charged body. B. remain in the negatively charged body. C. move from the positively charged body to the negatively charged body. D. remain in the positively charged body.
How many full length strands of hair are collected from the scalp to use as a sample
Why is calcium harder than potassium?
How many grams of KClO3 are needed to produce of 4.26 moles of O2? 2 KClO3 2 KCl + 3 O2 a. 348 g b. 136 g c. 174 g d. 522 g e. 783 g
Ammonium hydroxide ionizes as follows: NH4OH(s) NH4 +(aq) + OH-(aq). If an excess of ammonium salt, such as NH4Cl (which ionizes to give NH4 +(aq) ions) is added to the equilibrium shown above, you could predict that the result will be to....

If a molecule has four hybrid sp3 orbitals, it can be concluded that the molecule has a

Answers

Tetraedral shape. Like CH4.

Persamaan kimia bagi magnesium

Answers

English please ..I don't understand this.

Find volume of 1 mole of helium gas when the pressure is 1.46 atm and the temperature is 270k

Answers

we can use the ideal gas law equation to find the volume of He
PV = nRT
where P - pressure 1.46 atm x 101 325 Pa/atm = 147 934.5 Pa 
V - volume 
n - number of moles - 1 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 270 K
substituting these values in the equation
147 934.5 Pa x V = 1 mol x 8.314 Jmol⁻¹K⁻¹ x 270 K
V = 15.17 L
the volume is 15.17 L

How many millimeters (mm) are in 25 meters? Also, pick the choice that shows the correct math work.O Q025 mm; because 25 m x
1 m
1.000 mm
= 0.025 mm
1.000 mm
O 25.000 mm; because 25 m x = 25,000 mm
1 m
25.000 mm; because 25 m X
100 mm
= 2500 mm
1 m
O 0.025 mm; because 25 m x
1 m
100 mm
= 0.25 mm

Answers

Answer:

25000 mm: because 25 m × 1000 mm /1 m = 25000 mm

Explanation:

We can convert 25 m to millimetre (mm) by doing the following:

Recall:

1 m = 1000 mm

Therefore,

25 m = 25 m × 1000 mm /1 m = 25000 mm

25 m = 25000 mm

Thus, 25 m is equivalent to 25000 mm

Which of the following statements is correct?A large Keq value indicates that products are favored.
A small Keq value indicates that the reverse reaction will occur very quickly.
A large Keq value indicates that reactants are favored.
A small Keq value indicates that products are favored.

Answers

The statements that are correct are ‘A large Keq value indicates that products are favored.’ And ‘A small Keq value indicates that the reverse reaction will occur very quickly.’ Having large Keq means that the concentration of the product is greater than the reactants and so products are favored. Having small Keq means that the concentration of the reactants is greater than the product.

A large Keq value indicates that products are favored.

When a substance dissolves, it undergoes a _____.

Answers

The right answer is physical change.

In the general sense, dissolution is the action of dissolving something, that is to say, of decomposing it by the separation of its parts.

In chemistry, dissolution is an intimate mixture of two bodies, at least one of which is liquid.

Eg: the dissolution of sugar in the water, the sugar will pass from the solid and dry state to the dissolved state so there is a physical change. The sugar is going to be surrounded by water molecules and form hydrogen bonds, so it can be a chemical change.

2 types of changes
physical change
chemical change

the easy way to tell the difference is
a physical change is genrally reversable
it changes the look but not the composition
for example, water freezes into ice is physical change

a chemical change is generally not reversable (easily)
ex metal rusting, egg rotting
it changes theh composition itself


when a substance disolves, it actually merges and the molecules move around and sometimes bond
so it's a chemical change