How many grams of NaOH (MW = 40.0) are there in 500.0 mL

The cells that allow your bones to move contain bundles of long cylinders. These cells have alternating light and dark bands cal

poizon [28]

Answer:

<h2>Actin and myosin.</h2>

Explanation:

The cells that allow your bones to move, the movement of thick (myosin) and thin (actin) filaments during contraction .

During a contraction thick and thin filaments do not shorten but increase their overlap of each other.

Thin filaments slide past thick filaments extending more deeply into the A band.

The I bands and H bands decrease in lenght as Z discs are come closer together .

Sarcomere represents area between two Z disc, so the sarcomere gets smaller during a contraction .

8 0

3 years ago

Which of the following Period 4 elements has the most metallic characteristics?

stealth61 [152]

The scale of most metal characteristics goes from the bottom left-hand corner.

The least metallic is the top right-hand.

So then that means that

Calcium-YES, second column
Germanium-No, to far, in the middle
Arsenic-Non-metal,
Bromine, same for this

Calcium

8 0

3 years ago

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If 4.12 l of a 0.850 m-h3po4 solution is be diluted to a volume of 10.00 l, what is the concentration of the resulting solution?

statuscvo [17]

The process in which the concentration of the solution is lessened by the addition of water is said to be dilution and equation of dilution relates the initial concentration and volume of stock solution with the final concentration and volume of the solution.

Formula is given by:

$C_{1}V_{1}=C_{2}V_{2}$ (1)

where,

$C_{1}$ is the initial concentration

$V_{1}$ is the initial volume

$C_{2}$ is the final concentration

$V_{2}$ is the final volume

Now,

$C_{1}$ = 0.850 M

$V_{1}$ = 4.12 L

$C_{2}$ =?

$V_{2}$ = 10.00 L

Substitute the give values in formula (1),

$0.850 M\times 4.12L=C_{2}\times 10.00 L$

$C_{2} =\frac{0.850 M\times 4.12L}{10.00 L}$

= $0.3502 M$

Thus, the final concentration of the $H_{3}PO_{4}$ solution = $0.3502 M$

5 0

2 years ago

An old iron battery was discarded in this meadow. The iron in the battery is undergoing a ____ change as it rusts. The rusting i

Lelu [443]

Answer:

chemical

Explanation:

A chemical change is irreversible and leads to the formation of new products.

Rusting occurs as a result of an irreversible chemical reaction between iron, oxygen and moisture. Rusting is the oxidation of iron when exposed to oxygen and moisture.

The rusting of iron is an electrochemical process in which water serves as the electrolyte and iron serves as the anode. The rusting of iron leads to the formation of hydrated iron III oxide (rust) usually seen an brown flakes that surround a rusted iron material.

3 0

3 years ago

A buffer contains significant amounts of ammonia and ammonium chloride.

Oksanka [162]

Answer:

a. HCl + NH₃ ⇄ NH₄Cl

b. KOH + NH₄⁺ ⇄ K⁺ + NH₃ + H₂O

Explanation:

A buffer system is made by a weak base (ammonia, NH₃) and its conjugate acid (ammonium ion NH₄⁺ coming from ammonium chloride NH₄Cl). Its function is to resist abrupt changes in the pH when acids or bases are added.

a. When aqueous hydrochloric acid is added, it reacts with the base of the buffer. The corresponding equation is:

HCl + NH₃ ⇄ NH₄Cl

b. When aqueous potassium hydroxide is added, it reacts with the acid of the buffer. The corresponding equation is:

KOH + NH₄⁺ ⇄ K⁺ + NH₃ + H₂O

8 0

3 years ago