Which organ is found in the excretory system?

Which pair of elements would form an ionic bond? <br> n and o k and be c and cl fe and ni

Grace [21]

Answer:

k and be

Explanation:

because ionic bond occurs between a metal and a non metal

I would appreciate if my answer is chosen as a brainliest answer

4 0

3 years ago

Describe how a homogeneous moisture differs from a heterogeneous mixture

Shalnov [3]

Answer:

Explanation:

Mixture: is combination of one or more substances mix together.

• The properties of the mixture are not same and contains the properties of all those component present in it.

• it is a combination of one or more Pure substances and can be separated by simple physical methods.

• it have varying boiling and melting point

Homogeneous Mixture: are those which are not distinguish by naked eye but can be separated into its components by physical means.

The components of a homogeneous mixture are in the same phase oar in dissolved form so it look like one component.

Examples are:

• Salt water is mixture of water and NaCl and can be separated by physical mean.

• Air: mixture of gases

Heterogeneous mixture: are those which can be distinguishing by naked eye and can be separated into its components by physical means.

The component of heterogeneous mixture not fully mixed are different in color or different in phases or not soluble. So one can easily see the difference in the component of the mixture

Examples is

• mixture of salt and sand

• mixture of water and sand

3 0

3 years ago

select which of the following correctly represents the BALANCED chemical reaction for the production of HCL gas from its element

bagirrra123 [75]

Answer:

Choices 2 and 4

Explanation:

HCL is formed witthe the elements Hydrogen and Chlorine. Whatever is on the left side of the equation must match up with the right side of the equation.

2. H + Cl --> HCl (we have one hydrogen and one chlorine)

4. 2HCl --> H2 + Cl2 (since the two is distributed to both the H and the Cl, H has 2 and Cl has two on the left side AND on the right side of the equation)

3 0

2 years ago

An experiment shows that a 250 ?ml gas sample has a mass of 0.430 g at a pressure of 736 mmhg and a temperature of 28 ?c.

dmitriy555 [2]

What we're looking for here is the gas sample's molar mass given its mass, pressure, volume, and temperature. Recalling the gas law, we have

$PV = nRT$ or
$n = \frac{PV}{RT}$

where R is <span>0.08206 L atm / mol K, P is the given pressure, T is the temperature, and V is the volume.

Before applying the values given, it is important to make sure that they are to be converted to have consistent units with that of R.
</span>
Thus, we have

P = 736/ 729 = 0.968 atm
T = 28 + 273.15 = 301.15 K
V = 250/1000 = 0.250 L

Now, applying these converted values into the gas law, we have

$n = \frac{(0.968 atm)(0.250 L)}{(0.08206 L.atm/mol.K)(301.15 K)}$
$n = 0.00979 moles$

Given that the mass of the sample is 0.430 g, we have

$molar mass = \frac{mass}{number of moles}$
$molar mass = \frac{0.430}{0.00979} = 43.9$

Thus, the gas sample has a molar mass of 43.9 g/mol.

4 0

3 years ago

Consider an electron with charge âˆ’eâˆ’e and mass mmm orbiting in a circle around a hydrogen nucleus (a single proton) with cha

PtichkaEL [24]

Answer:

Explanation:

The net force on electron is electrostatic force between electron and proton in the nucleus .

Fc = $\frac{1}{4\pi\epsilon} \times \frac{e\times e}{r^2}$