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3 years ago

1. The

Chemistry

1 answer:

rodikova [14]3 years ago

3 0

Answer:

1. Proton = electron if the element is not in an ionic state

proton = atomic number

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Oxygen would acquire a stable arrangement of electrons by bonding with two atoms of which of the following elements?

crimeas [40]

<span>D.) Oxygen would acquire a stable arrangement of electrons by bonding with two atoms of "Magnesium"
[ As Mg has 2 extra electrons & their size are quite similar ]

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3 years ago

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Which one of the following human organ systems is mainly made up of glands and hormones

fomenos

The lymphatic system

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4 years ago

How thick is the outer core

amm1812

The outer core of the earth is about 1,400 miles thick.

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4 years ago

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Calculate the payback time if she insulates the loft with 300 mm insulation when: area of loft space = 100m^2 cost of roll of 10

ycow [4]

Answer: Payback time = 0.0075

Explanation: Since payback time is calculated as:

payback time = $\frac{installation cost}{annual savings}$

First determine the installation cost:

100 mm thick insulation covers 8.3 m². Then 300 mm covers 24.9 m².

To cover 8.3m² costs £20. Then, the cost to cover 24.9 m² is:

cost = $\frac{20*24.9}{8.3}$

cost = £60

The cost of putting the insulation is £120, so the total cost is:

total cost = £60 + £120

total cost = £180

Savings per year per 100 mm thick is £80. For 300 mm, the value of annual savings is:

savings = $\frac{300*80}{100}$

savings = 240

payback time = $\frac{installation cost}{annual savings}$

payback time = $\frac{180}{240}$

payback time = 0.75

8 0

4 years ago

Consider a new temperature scale (ºa) based on the melting and boiling points of ammonia (nh3) which are taken as 0.0 ºa and 100

Nady [450]

Answer:- 25.0 degree C corresponds to 231 $^0A$ .

Solution:- Let's say the two temperature scales have linear relationship. The equation of line is:

$y=mx+c$

where, m is the slope of the line and c is the intercept. Let's take the new temperature scale, $^0A$ for y and $^0C$ as $x$ . The equation would be looking as:

$^0A=m*^0C+c$

melting point of ammonia in new scale is 0.0 $^0A$ and in celsius scale it is -77.7 degree C. Boiling point in new scale is 100.0 $^0A$ and in celsius scale it is -33.3 degree C.

Let's plug in the values in the equation of line for melting points and boiling points to make two equations that we would solve:

For melting point:- $0.0=m(-77.7)+c$

For boiling point:- $100=m(-33.3)+c$

Now, we solve these two equations to find out the slope of the equation that is the value of m. Let's multiply the second equation by negative means changing all the signs from negative to positive and vice versa.

$0.0=m(-77.7)+c$

$-100=m(+33.3)-c$