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3 years ago

What is a metal oxide and hiw are they formed?

Chemistry

1 answer:

mamaluj [8]3 years ago

7 0

It is a <u><em>chemical compound</em></u> formed with a metal (mainly positive cations) with oxygen.

It is formed through the air as they react in the air together.

They are also BASES - ALKALINE (so neutralise acids)

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Manganese (IV) nitride formula

stepan [7]

Answer:

Mg(NO3)2 is the formula of manganese (IV) nitride.

7 0

3 years ago

Before the use of technetium-99m, patients with high risk coronary artery disease were evaluated using thallium-201 which has a

agasfer [191]

Answer: 243 hours

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = initial amount of the reactant = $5.000\mu g$

a - x = amount left after decay process = $\frac{10}{100}\times 5.000\mu g=0.5\mu g$

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.693}{73.00hours}=9.49\times 10^{-3}hours^{-1}$

b) for reducing the mass to 10.00 % of its original mass

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

$t=\frac{2.303}{9.49\times 10^{-3}}\log\frac{5.000}{0.5}$

$t=243hours$

The time taken to reach 10.00 % of its original mass is 243 hours

3 0

3 years ago

State one difference in the physical properties of the isotopes 63Cu and 65Cu and explain why their chemical properties are the

kupik [55]

Of the same element with different mass numbers are called isotopes 3) Isotopes have the same number of protons but different numbers of neutrons in their nuclei. ... The 63Cu isotope has 63 - 29 = 34 neutrons. The 65Cu isotope has 65 - 29 = 36 neutrons.

5 0

3 years ago

If 135.7 J of heat are added to 54.0 g of water initially at 25.0 °C . What is the final temperature of the water?

german

Answer:

The final temperature of the water is 25.6 °C.

Explanation:

We have,

Heat added to water is 135.7 J

Mass, m = 54 g

Initial temperature was 25 °C

It is required to find the final temperature of the water. The heat added when temperature is increased is given in terms of specific heat capacity as :

$Q=mc(T_f-T_i)$