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3 years ago

What temperature does table salt melt at?

Chemistry

2 answers:

adoni [48]3 years ago

8 0

1,474 degrees fahrenheit (801 degrees celsius)

Ymorist [56]3 years ago

4 0

Salt, also known as sodium chloride, melts roughly around 801 degrees Celsius or 1473.8 Fahrenheit.

I think this is mainly for table salt.

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In a certain city, electricity costs $0.15 per kW·h. What is the annual cost for electricity to power a lamp-post for 6.00 hours

Vanyuwa [196]

(a) Power of bulb is 100 W, converting this into kW.

$1 W=\frac{1}{1000}kW$

Thus,

$100 W =\frac{100}{1000}kW=0.1 kW$

The bulb is used for 6 hours per day for a year, in 1 year there are 365 days thus, total hours will be:

$t=6\times 365=2190 h$

Electricity used will depend on power and number of hours as follows:

$E=P\times t=0.1 kW\times 2190 h=219 kW.h$

The cost of electricity is $0.15 per kW.h thus, cost of electricity for 219 kW.h will be:

$Cost=\$ (219\times 0.15)=\$ 32.85$

Therefore, annual cost of incandescent light bulb is $\$ 32.85$

(b) Power of bulb is 25 W, converting this into kW.

$1 W=\frac{1}{1000}kW$

Thus,

$100 W =\frac{25}{1000}kW=0.025 kW$

The bulb is used for 6 hours per day for a year, in 1 year there are 365 days thus, total hours will be:

$t=6\times 365=2190 h$

Electricity used will depend on power and number of hours as follows:

$E=P\times t=0.025 kW\times 2190 h=54.75 kW.h$

The cost of electricity is $0.15 per kW.h thus, cost of electricity for 54.75 kW.h will be:

$Cost=\$ (54.75\times 0.15)=\$ 8.21$

Therefore, annual cost of fluorescent bulb is $\$ 8.21$ .

7 0

3 years ago

650. J is the same amount of energy as A. 155 cal. B. 2720 calC. 650 cal.D. 1550 cal.

sladkih [1.3K]

Answer:

$A\text{ : 155 cal}$

Explanation:

Here, we want to convert J to cal

Mathematically:

$1\text{ cal = 4.186 J}$

Thus, to get our answer in cal, we divide the value given by 4.186

We have that as:

$\frac{650}{4.186}\text{ = 155 cal}$

5 0

1 year ago

How does the density of one penny compare with the density of two pennies

Mice21 [21]

Density increases.......

6 0

3 years ago

How does the octet rule explain the formation of a sodium ion?

Lisa [10]

It is in the 8th row of the periodic table

8 0

3 years ago

Monodisperse polyacrylonitrile contains molecules with the general formula -(CH2CHCN)n-, where n is typically greater than 10,00

pentagon [3]

Answer:

7.68 × 10²⁴

Explanation:

Step 1: Calculate the mass of 1 molecule of the monomer CH₂CHCN

We will get the mass of the monomer by adding the masses of the elements.

mCH₂CHCN = 3 × mC + 3 × mH + 1 × mN

mCH₂CHCN = 3 × 12.01 amu + 3 × 1.01 amu + 1 × 14.01 amu = 53.07 amu

Step 2: Convert the mass of the monomer to grams

We will use the conversion factor 1 amu = 1.66 × 10⁻²⁴ g

53.07 amu × 1.66 × 10⁻²⁴ g/1 amu = 8.81 × 10⁻²³ g

Step 3: Calculate "n"

We will divide the mass of the polymer by the mass of the monomer.

n = 676.8 g / 8.81 × 10⁻²³ g = 7.68 × 10²⁴

6 0

3 years ago