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3 years ago

When the compound Na2S forms what happens to the Na and S ions

2 answers:

8 0

Nothing, ATOMS lose or gain electrons to become IONS
Two Na ATOMS lose 1 electron each and 1 S ATOM gains 2 electrons

Gemiola [76]3 years ago

6 0

Since sodium ions each have a single positive charge (lacking one electron in its valence orbital) and sulfur ions each have a 2- charge (having two extra electrons in its valence orbital), the compound Na2S forms when two sodium ions are ironically bound to a central sulfur.

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The fact that desert sand is very hot in the day and very cold at night is evidence that sand has

insens350 [35]

Answer:

A) a low specific heat.

Explanation:

As we know that heat given to the sand will increase it temperature

so we can say

$Q = ms\Delta T$

here we will have

$\Delta T = \frac{Q}{ms}$

so now we will have

more change in temperature due to heat given to the sand will show that it must have low specific heat capacity as it inversely depends on the specific heat capacity of the sand

so correct answer will be

A) a low specific heat.

5 0

3 years ago

Read 2 more answers

Is horsepower the only thing to be considered when purchasing a piece of equipment?Explain.

Novosadov [1.4K]

Answer:

Mostly yes

Explanation:

But you should consider,brand value, material used and lasting of the equipment also

1HP=720W

HP stands for horsepower

It's mostly used in pumps

8 0

2 years ago

Read 2 more answers

When measuring the diameter of a cylinder the following measurements are obtained.

Arlecino [84]

Answer:

a. 1.80 %

b. 0.60 %

c. 1.20 %

d. 0.60 %

e. 0.60 %

Explanation:

In order to calculate percent uncertainties in each case, we forst need to calculate the average value:

Average Diameter = (16.4 mm + 16.8 mm + 16.9 mm + 16.6 mm +16.8 mm)/5

Average Diameter = 16.7 mm

Now, the formula for percent uncertainty is:

% Uncertainty = (Uncertainty/Average) * 100 %

where,

Uncertainty = |Value - Average|

For Each Case:

a. 16.4 mm:

Uncertainty = |16.4 mm - 16.7 mm| = 0.3 mm

Therefore,

% Uncertainty = (0.3 mm/16.7 mm) * 100%

% Uncertainty = 1.80 %

b. 16.8 mm:

Uncertainty = |16.8 mm - 16.7 mm| = 0.1 mm

Therefore,

% Uncertainty = (0.1 mm/16.7 mm) * 100%

% Uncertainty = 0.60 %

c. 16.4 mm:

Uncertainty = |16.9 mm - 16.7 mm| = 0.2 mm

Therefore,

% Uncertainty = (0.2 mm/16.7 mm) * 100%

% Uncertainty = 1.20 %

d. 16.6 mm:

Uncertainty = |16.6 mm - 16.7 mm| = 0.1 mm

Therefore,

% Uncertainty = (0.1 mm/16.7 mm) * 100%

% Uncertainty = 0.60 %

e. 16.8 mm:

Uncertainty = |16.8 mm - 16.7 mm| = 0.3 mm

Therefore,

% Uncertainty = (0.1 mm/16.7 mm) * 100%

% Uncertainty = 0.60 %

7 0

3 years ago

The theory of the origin of the universe that is most popular among space scientists suggests that our universe originated how l

Anna007 [38]

Answer:

10 - 20 million years ago

3 0

3 years ago

Consider projectile thrown horizontally at 50 m/s from height of 19.6 meters. The projectile will take ______________ time to hi

aleksley [76]

Answer:

C)The Same

Explanation:

Kinematics equation:

$y=v_{oy}*t+1/2*g*t^2$

for both cases the initial velocity in the axis Y is the same, equal a zero.

So the relation between the height ant temps is the same for both cases (the horizontal velocity does not play a role)

C)The Same

3 0

3 years ago