(b) when heated, solid calcium chlorate decomposes into calcium chloride solid, releasing oxygen gas.

A liquid in lab has a density of 1.24g/cm3. What is the mass in grams of 254mL of the liquid?

o-na [289]

Answer:

Mass= 314.96 grams

Explanation:

The density of the substance is defined as mass per unit volume of it.

The formula is :

$density=\frac{mass}{Volume}$

Unit conversion:

1 liter = 1000 ml

$1dm^{3}=1Liter$

So

$1dm^{3}=1000ml$ ....(1)

$1dm^{3} = (10cm)^{3}$

$1dm^{3}=1000cm^{3}$

Replace The dm3 by cm3 in (1)

$1000cm^{3}=1000mL$

$1cm^{3}=1mL$

Volume = 254 mL = 254 cm3

Calculation of mass

$density=\frac{mass}{Volume}$

$1.24=\frac{mass}{254cm^{3}}$

$mass=1.24\times 254$

Mass= 314.96 grams(or 315 grams)

Note: Always makes same units before solving the question. You can not determine the mass if Volume is in mL and Density is in g/cm3. Change mL into cm3 first

8 0

3 years ago

Some atoms are chemically stable and will not bond with atoms of other

tigry1 [53]

Answer:

The stability of atoms depends on whether or not their outer-most shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.

Explanation:

7 0

3 years ago

Read 2 more answers

An atom has at least one positive proton and at least one negative electron. Which of the following is true about the protons an

NikAS [45]

Answer:

proton and electrons orbit close together around a center nucleus

6 0

3 years ago

Read 2 more answers

Use Lewis theory to draw the structure of the compound containing 1 carbon and 4 chlorine atoms. What would you find surrounding

Nikolay [14]

Answer : The correct option is, (B) no double bonds.

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

As we are given that the structure of the compound containing 1 carbon and 4 chlorine atoms.

Thus, the molecule is, $CCl_4$

As we know that carbon has '4' valence electrons and chlorine has '7' valence electrons.

Therefore, the total number of valence electrons in $CCl_4$ = 4 + 4(7) = 32

According to Lewis-dot structure, there are 8 number of bonding electrons and 24 number of non-bonding electrons.

From the Lewis-dot structure we conclude that there are 4 single bonds are surrounding the central atom of this ion there is no double or triple bonds are present.

Hence, the correct option is, (B) no double bonds.

4 0

3 years ago

Help me which answer and I need explain

stiks02 [169]

Distance÷Time=Speed
10(km)÷0.75(hours)=13.333......
So the answer is 13km/hr

4 0

3 years ago