All categories

4 years ago

What is the main function of the muscular system A. digestion B. breathing C.movement D. Eliminating

Chemistry

2 answers:

Eva8 [605]4 years ago

5 0

Answer:

C, Movement

Explanation:

natita [175]4 years ago

3 0

The answer is C- movement

You might be interested in

Stemscopedia

Alexeev081 [22]

What’s the question

7 0

3 years ago

The solubility of oxygen gas in water at 40 ∘c is 1.0 mmol/l of solution. What is this concentration in units of mole fraction?

juin [17]

The formula for mole fraction is:

$mole fraction of solute = \frac{number of moles of solute}{total number of moles of solution}$ -(1)

The solubility of oxygen gas = 1.0 mmol/L (given)

1.0 mmol/L means 1.0 mmol are present in 1 L.

Converting mmol to mol:

$1.00 mmol\times \frac{1 mol}{1000 mmol} = 0.001 mol$

So, moles of oxygen = 0.001 mol

For moles of water:

1 L of water = 1000 mL of water

Since, the density of water is 1.0 g/mL.

$Density = \frac{mass}{volume}$

$Mass = 1.0 g/ml\times 1000 mL = 1000 g$

So, the mass of water is 1000 g.

Molar mass of water = 18 g/mol.

Number of moles of water = $\frac{1000 g}{18 g/mol} = 55.55 mol$

Substituting the values in formula (1):

$mole fraction = \frac{0.001}{55.55+0.001}$

$mole fraction = 1.8\times 10^{-5}$

Hence, the mole fraction is $1.8\times 10^{-5}$ .

7 0

3 years ago

I WILL MARK YOU BRAINLIST PLEASE HELP

tekilochka [14]

Answer: See below

Explanation: a. The mass of an element is composed of:

protons: 1 amu each

neutrons: 1 amu each

electrons: 0 amu each

Only the protons and neutrons are counted in the atomic mass of an element

b. Electrons are assigned a mass of 0. They do have a mass, but it is exceedingly small compared to the protons and neutrons, so they are left out of the calculation of an element's mass.

c. An element becomes unstable if the neutrons exceed the protons by a certain ratio, dependent on the element.

7 0

2 years ago

Based on the activity series, which metals could X represent in the reaction below? (Note: The equation is not balanced.)

Nikitich [7]

Answer is: A) Sr (strontium).
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Strontium is only higher in this group from magnesium. Strontium is stronger reducing agent than magnesium, gives electrons easier.

3 0

3 years ago

PLEASE HELP!!!! Two science questions!!!! 20 points and brainliest!!!

Angelina_Jolie [31]

1. A cylinder is submerged in water as illustrated in the diagram. Which of the following statements is true?

The pressure at D is greater than at B. This is because D is trying to get back to the surface with an amount of pressure. B has less amount of pressure.

2. A cylinder is submerged in water as illustrated in the diagram. If the area of the top and the bottom of the cylinder is the same, which of the following statements is true?

buoyant force = (force D - force A).

Edit: If you ever notice. When you fill a sink full of water. Put a glass upside down and try forcefully to submerge it under the water it will resist. This is because of the pressure and air. The glass is less dense then water. (Also depends on the glass)

8 0

4 years ago