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3 years ago

What is an ionic compound? Write an example.

2 answers:

6 0

An ionic compound is a compound between a metal and a non metal where the metal (normally from group 1 or 2) transferrs an electron to the non metal ( most commonly from group 6 or 7) . this is so that both atoms have a full outer shell of electrons. the metal gains a positive charge and the non metal a negative charge. they are held together by electrostatic forces of attraction. an example would be sodium chloride (salt) sodium is in group 1 and chlorine in group 7 so sodium transfers one electron :)

zheka24 [161]3 years ago

6 0

Question

What is an ionic compound? Write an example.

Answer:

Ionic compounds are compounds consisting of ions. Two-element compounds are usually ionic when one element is a metal and the other is a non-metal. Examples include: sodium chloride: NaCl, with Na+ and Cl- ions.

Hope this helps!

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25) Which of the following would exert the most pressure on the ground? 3 points

Zarrin [17]

Answer:

a women standing in high heels

Explanation:

8 0

3 years ago

Read 2 more answers

Commercially available solution of SPT has a density of 3.10 g/mL. Water (1.00 g/mL) can be added to the original SPT solution,

Pepsi [2]

The reciprocal of the density, ρ, of a mixture is equal to the sum of the reciprocal of the densities of the constituents multiplied by their respective proportions ( $x_i$ ) in the solution, $\displaystyle \dfrac{1}{\rho_{(mixture)}} = \sum \dfrac{x_i}{\rho _i}$

The percentage of water in the 2.75 g/mL SPT solution is $\underline{16. \bar6 \ \%}$

Reason:

Known parameter:

Density of SPT = 3.10 g/mL

Density of water = 1.00 g/mL

Required:

The percentage of water in 2.75 g/mL SPT solution

Solution:

Let x the volume of water added per 100 mL of 2.75 g/mL SPT solution, we have;

Mass of water in the solution = x mL × 1.00 g/mL = x g

Mass of commercial SPT = (100 - x) mL × 3.10 g/mL = (310 - 3.1·x) g

$Density = \dfrac{Mass}{Volume}$

The density of the 2.75 g/mL SPT solution is given as follows;

$Density \ of \ 100\ mL, \ 2.75 \ g/mL = \dfrac{(310 - 3.1\cdot x + x) \ g}{100 \ mL}$

100 mL × 2.75 g/mL =( 310 - 2.1·x) g

310 - 275 = 2.1·x

$x = \dfrac{310 - 275}{2.1} = \dfrac{50}{3} = 16.\overline 6$

Given that the reference quantity of the proportion of water in the solution is 100 mL of the 2.75 g/mL SPT solution, the percentage (per 100) of water in the overall solution is the value of x

Therefore;

The percent of the SPT solution that must consist of water to give an overall density of 2.75 g/mL is x = $\displaystyle {\underline {16.\overline 6 \ \%} }$

Learn more here: brainly.com/question/13346179

5 0

3 years ago

How many cobalt atoms are in 345 g of cobalt

lilavasa [31]

Answer:

$\boxed {\boxed {\sf About \ 3.53 \ *10^{24}atoms \ Co}}$

Explanation:

To convert from grams to atoms:

Convert grams to moles
Convert moles to grams

1. Convert grams to moles

First, find the molar mass of cobalt using the Periodic Table of Elements.

Cobalt (Co): 58.93319 g/mol

Next, use this mass as a ratio or fraction.

$\frac{58.93319 \ g\ Co}{1 \ mol \ Co}$

Multiply the mass of the given sample (345 grams) by this ratio.

$345 \ g \ Co *\frac{58.93319 \ g\ Co}{1 \ mol \ Co}$

Flip the fraction so the grams of Cobalt will cancel each other out when multiplying.

$345 \ g \ Co *\frac{1 \ mol \ Co}{58.93319 \ g\ Co}$

$345 \ *\frac{1 \ mol \ Co}{58.93319 }$

$\frac{345 \ mol \ Co}{58.93319 } =5.854086636 \ mol \ Co$

2. Convert moles to atoms

Use Avogadro's Number, which tells us the number of units (in this case atoms) in 1 mole.

$6.022 *10^{23} \ atoms/mol$

Use this number as a ratio or fraction.

$\frac{6.022 * 10^{23} \ atoms \ Co}{1 \ mol \ Co}}$

Multiply this ratio by the number of moles we found.

$5.854086636 \ mol \ Co*\frac{6.022 * 10^{23 }\ atoms \ Co}{1 \ mol \ Co}}$

The moles of Cobalt will cancel.

$5.854086636 \ *\frac{6.022 * 10^{23 }\ atoms \ Co}{1 }}$

$5.854086636 \ *{6.022 * 10^{23 }\ atoms \ Co}$

$3.52533097*10^{24} \ atoms \ Co$

3.Round

The original measurement of 345 has 3 significant figures (3, 4, and 5). We must round to 3 sig figs, which is the hundredth place for this measurement.

$3.52533097*10^{24} \ atoms \ Co$

The 5 in the thousandth place tells us to round the 2 to a 3.

$3.53 \ *10^{24}atoms \ Co$

There are about 3.53*10²⁴ atoms of cobalt in 345 grams.

6 0

3 years ago

Heart cells require a certain balance of sodium and potassium ions to function. The blood, which is approximately 83% water, car

drek231 [11]

The property of water is its polarity

6 0

3 years ago

What how many degrees variation is there between the highest temperatures and lowest temperatures on the moon? about 550ºC about

kirill [66]

Answer:

about 310ºC

Explanation:

The Moon is the natural satellite of the Earth.

The Moon orbits around the Earth in approximately 27 days, and its average distance from the Earth is about 380,000 km.

Moreover, the mass of the Moon is $7.35\cdot 10^{22}kg$ .

The Moon has no water on its surface and no atmosphere: due to the lack of atmosphere, heat coming from Solar radiation is not retained near the surface. Moreover, the Moon orbits around the Earth keeping one face always towards it, so every location on the Moon has 13 consecutive days of daylight followed by 13 days of darkness.

As a result, there is a large thermic excursion between the maximum and minimum temperature on the Moon. In particular, we have:

- Minimum temperature: -173 degrees Celsius

- Maximum temperature: +127 degrees Celsius

So this difference is about

$\Delta T = 127-(-173)=300^{\circ}C$

So, about 310ºC.

7 0

4 years ago