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3 years ago

Na S (1) + CdNO3 (1) ➡️ Cds (s) + 2 NaNO3 (1) is which type of reaction?

Chemistry

1 answer:

DaniilM [7]3 years ago

7 0

a) double-displacement

Explanation:

We have the following chemical reaction:

Na₂S (aq) + Cd(NO₃)₂ (aq) → CdS (s) + 2 NaNO₃ (aq)

where:

(aq) - aqueous

(s) - solid

This chemical reaction is a double-displacement reaction because the reactant exchange atoms or group of atoms between themselves. The reaction is driven to right by the formation of the precipitate. The general representation for this kind of reaction is: AB + CD → AC + BD

In a synthesis reaction two elements will combine to form a compound.

2 H₂ + O₂ → 2 H₂O

In a single-displacement reaction an atom or group of atoms from a compound is displaced by another atoms. The general representation for this kind of reaction is: A + BC → B + AC

Learn more about:

type of chemical equations

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Write the balanced equation for the reaction of dilute sulfuric acid. H2so4 , with sodium hydroxide

Aleksandr [31]

Answer:

H2SO4 + 2NaOH → Na2SO4 + 2H2O

Explanation:

This question is describing the neutralization reaction between dilute sulfuric acid (H2SO4) and sodium hydroxide (NaOH). These two compounds combine to form sodium salt and water as products (see the chemical equation below).

H2SO4 + NaOH → Na2SO4 + H2O

However, this equation is not BALANCED because the number of atoms of each element are not the same on both sides of the equation. To balance the equation, COEFFICIENTS are used as follows:

H2SO4 + 2NaOH → Na2SO4 + 2H2O

From this equation, the atoms of hydrogen (H), sulphur (S), oxygen (O), sodium (Na) are now equal on both sides, hence, it is said to be BALANCED.

3 0

3 years ago

When potassium cyanide (KCN) reacts with acids, a deadly poisonous gas, hydrogen cyanide (HCN), is given off: KCN(aq) + HCl(aq)

maks197457 [2]

<u>Answer:</u> The mass of hydrogen cyanide formed is 0.17 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of KCN = 0.420 g

Molar mass of KCN = 65.12 g/mol

Putting values in equation 1, we get:

$\text{Moles of KCN}=\frac{0.420g}{65.12g/mol}=0.0064mol$

The given chemical equation follows:

$KCN(aq.)+HCl(aq.)\rightarrow HCN(g)+KCl(aq.)$

As, hydrochloric acid is present in excess. So, it is considered as an excess reagent.

Thus, potassium cyanide is a limiting reagent because it limits the formation of products.

By Stoichiometry of the reaction:

1 mole of potassium cyanide produces 1 mole of hydrogen cyanide.

So, 0.0064 moles of potassium cyanide will produce = $\frac{1}{1}\times 0.00064=0.0064mol$ of hydrogen cyanide

Now, calculating the mass of hydrogen cyanide from equation 1, we get:

Molar mass of HCN = 27.02 g/mol

Moles of HCN = 0.0064 moles

Putting values in equation 1, we get:

$0.0064mol=\frac{\text{Mass of HCN}}{27.02g/mol}\\\\\text{Mass of HCN}=0.17g$

Hence, the mass of hydrogen cyanide formed is 0.17 grams

3 0

4 years ago

4. Calculate the total heat required to convert 23.6 g of ice at -27 ºC to steam at 121 ºC. Hint: Calculation involves more than

DanielleElmas [232]

Answer:

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Explanation:

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3 years ago

A mileage test is conducted for a new car model. Thirty randomly selected cars are driven for a month and the mileage is measure

Leni [432]

Answer: $(27.81,\ 29.39)$

Explanation:

Given : Sample size : n= 30 , it means it is a large sample (n≥ 30), so we use z-test .

Significance level : $\alpha: 1-0.95=0.05$

Critical value: $z_{\alpha/2}=1.96$

Sample mean : $\overline{x}=28.6$

Standard deviation : $\sigma=2.2$

The formula to find the confidence interval is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

i.e. $28.6\pm (1.96)\dfrac{2.2}{\sqrt{30}}$

i.e. $28.6\pm 0.787259889321$

$\approx28.6\pm 0.79=(28.6-0.79,28.6+0.79)=(27.81,\ 29.39)$

Hence, the 95% confidence interval for the mean mpg in the entire population of that car model = $(27.81,\ 29.39)$

4 0

3 years ago

In addition to atp, what are the 2 other end products of glycolysis?

hjlf

The end products of glycolysis are two Pyruvate, two NADH, and two ATP..
so from above
E is the answer

5 0

4 years ago