All categories

3 years ago

Please help. im freaking out rn. i have like 40 missing assignments please

Chemistry

1 answer:

Katarina [22]3 years ago

5 0

Answer:

I'm pretty sure its the one that says very little at the beginning but if I get it wrong I'm sorry

You might be interested in

A vehicle is traveling at a speed of 92.5 km/h. What is this value in feet per second? Note that, by definition, 1 in = 2.54 cm.

Harlamova29_29 [7]

Answer:

$v=84.3\frac{ft}{s}$

Explanation:

Hello,

In this case, given that 1 kilometer equals 1000 meters, 1 meter equals 3.281 feet and 1 hour equals 3600 seconds, the required velocity in feet per second turns out:

$v=92.5\frac{km}{h}*\frac{1000m}{1km} *\frac{3.281ft}{1m} *\frac{1h}{3600s}\\ \\v=84.3\frac{ft}{s}$

Regards.

7 0

3 years ago

(i) 1s2 2s2 2p6 3s1 (ii) 1s2 2s2 2p6 3s2 (iii) 1s2 2s2 2p6 3s2 3p1 (iv) 1s2 2s2 2p6 3s2 3p4 (v) 1s2 2s2 2p6 3s2 3p5 The electron

astra-53 [7]

Answer:

Explanation:

Firstly let’s list the names of the atoms

1. Sodium

2. Magnesium

3. Aluminum

4. Oxygen

5.Chlorine

Generally, anions have greater electron affinity than cations. Hence, they have more positive values for this electron affinity. This means that the higher the electron affinity, the greater its positive value

Electron affinity increases across a period. Thus, it is expected that chlorine has the highest value

4 0

3 years ago

Classify each of the following as a homogeneous or heterogeneous substance.

Mnenie [13.5K]

Answer:

a). iron ore - is a heterogeneous substance.

b). quartz - is a homogeneous substance.

c). granite - is a heterogeneous substance.

d). energy drink - is a heterogeneous substance.

e). oil-and-vinegar salad dressing - is a heterogeneous substance.

f). salt - is a homogeneous substance.

g). rainwater - is a heterogeneous substance.

h). nitrogen - is a homogeneous substance.

Explanation:

a). iron ore - is a heterogeneous substance as iron core contains iron and other impurities

b). quartz - is a homogeneous substance as it is only made up of carbon

c). granite - is a heterogeneous substance as it is made up of multiple minerals.

d). energy drink - is a heterogeneous substance as it contains various substances mixed in it

e). oil-and-vinegar salad dressing - is a heterogeneous substance as oil and vinegar itself are different compounds

f). salt - is a homogeneous substance as it only contains one type of molecule

g). rainwater - is a heterogeneous substance as it contains water and other minerals

h). nitrogen - is a homogeneous substance as it is only made of one type of molecule.

5 0

1 year ago

Calculate the density of a 20.015 g object that occupies 5.44 cm3 .

Scilla [17]

Answer:

$density = \frac{mass}{volume} \\ \\ density = \frac{20.015}{5.44} \\ \\ { \boxed{ \boxed{density = 3.679 \: g {cm}^{ - 3} }}}$

5 0

3 years ago

Read 2 more answers

Carbordum is silicon carbide SiC a very hard material used as an abrasive on sand paper and in other applications. it is prepare

AleksandrR [38]

Answer:

4.5 kilograms of silicon dioxide is required to produce 3.00 kg of SiC.

Explanation:

The balanced equation for the reaction between silicon dioxide and carbon at high temperature is given as:

$SiO_2+3C\rightarrow SiC+2CO$

1 mole silicon dioxide reacts with 3 moles of carbon to give 1 moles of silicon carbide and 2 moles of carbon monoxide.

Mass of SiC = 3.00kg = 3000.00 g

1 kg = 1000 g

Molecular mass of SiC = 40 g/mol

Moles of SiC = $\frac{3000.00 g}{40 g/mol}= 75 mol$

According to reaction, 1 mole of SiC is produced from 1 mole of silicon dioxide.

Then 75 moles of SiC will be produce from:

$\frac{1}{1}\times 75 mol=75 mol$ of silicon dioxide.

mass of 75 moles of silicon dioxde:

$75 mol\times 60 g/mol=4500 g=4.5 kg$

4.5 kilograms of silicon dioxide is required to produce 3.00 kg of SiC.

3 0

4 years ago