Indicate which element of the following pairs has the greater electronegativity

Help! 7th Grade Math!

vagabundo [1.1K]

Answer:

D

Explanation: Trust me

6 0

2 years ago

PLEASE HELP, 5 STARS, 35 POINTS + PRIZE The reaction C4H8(g)⟶2C2H4(g) has an activation energy of 262 kJ/mol. At 600.0 K, the ra

Ghella [55]

Answer:

346 hope this is helpfull

5 0

3 years ago

A quantity of 85.0 mL of 0.900 M HCl is mixed with 85.0 mL of 0.900 M KOH in a constant-pressure calorimeter that has a heat cap

san4es73 [151]

Answer:

There is a 1:1 neutralization reaction, so, number of moles:

0.085 l * 0.900 mol/ L = 0.0765 mol HCL

The heat produced: 0.0765 mol * -56.2 kJ/mol = -4.229 kJ (this is the heat of neutralization)

Change in temperature: The mass to use in the equation Q=cmT.

4229 J / (4.186 J/gC*170 g) = 6.042 C

Add to the initial temperature:

18.24 + 6.042 = 24.29 C°

3 0

3 years ago

The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO).

Masja [62]

Answer:

The correct answer is Option-B (Convert grams of Mg to moles)

Explanation:

In stoichiometry problems the first step is always to balance the given unbalanced chemical equation. In our case the given equation is already balanced hence, we looked for the second step.

As Niven wants to calculate the mass of MgO (which is the product) with respect to Mg (reactant) hence here comes another important rule. In such cases if one wants to compare masses of two reactants or reactant product. or product product then one should first convert the given mass into moles, also the same conversion for the second mass and then compare the moles and at last convert the moles back into mass. So, the flow chart should be like,

Mass (Mg) → Moles (Mg) : (MgO) Moles ← (MgO) Mass

After finding moles following step take place,

Moles (MgO) → Mass (MgO)

7 0

3 years ago

Read 2 more answers

Determine which of the acids are Arrhenius acids, Brønsted–Lowry acids, and Lewis acids. It is possible for an acid to be of mor

tatyana61 [14]

This is an incomplete question, here is a complete question.

Determine which of the acids are Arrhenius acids, Brønsted–Lowry acids, and Lewis acids. It is possible for an acid to be of more than one type. Which acids are Arrhenius acids?

AlCl₃ (aq)

BCl₃ (aq)

HCl (aq)

Answer :

HCl is an Arrhenius acid and Bronsted Lowry acid

AlCl₃ is a Lewis-acid

BCl₃ is a Lewis-acid

Explanation :

According to Arrhenius concept, a base is defined as a substance which donates hydroxide ions $(OH^-)$ when dissolved in water and an acid is defined as a substance which donates hydronium ions $(H_3O^+)$ in water.

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

From this we conclude that:

HCl is an Arrhenius acid because it donates hydrogen ion and also Bronsted Lowry acid because it also donate protons.

AlCl₃ is a Lewis-acid because it is a electron deficient and accept lone pair of elections.

BCl₃ is a Lewis-acid because it is a electron deficient and accept lone pair of elections.

7 0

3 years ago