Chemistry » Page 64

Chemistry

Naomi

How many protons are in a electrons?

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Chemistry

Guest

What is the sum of the numbers of neutrons and electrons in the ion 208 Pb2+?

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Chemistry

Sariah Duarte

The specific heat capacity of concrete is small this means that

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Chemistry

Sterling Wang

Air trapped in a cylinder fitted with a piston occupies 145 mL at 1.08 atm

pressure. What is the new pressure of air when the volume is decreased to 111 L?

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Chemistry

Pooh

The atoms of which element will NOT typically form ions?

a. H

B. Be

C. He

D. F

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Chemistry

Madden

What is the number of valence electrons in an atom of Al?

a. 13

b. 3

c. 10

d. 8

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Chemistry

Rojas

How many grams of NH4Cl will be needed to make a 1L solution with a concentration of 4.5M?

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Chemistry

Ivan Santos

What is the oxidation number change for the manganese atom in the following unbalanced reduction half reaction: MnO4 - (aq) + H + (aq) → Mn2 + (aq) + H2O (l) ? Mn goes from + 4 to + 2 Mn goes from + 3 to + 2 Mn goes from + 7 to + 2 Mn goes from + 8 to + 2

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Chemistry

Emmanuel Daniel

What is the empirical formula for butane, C4H10

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Chemistry

Matilda Vang

Scientist are always learning new things. which of the following shows how scientist use observations to gain new understanding about the world?

A. scientists have discovered new planets orbiting a star by detecting a wobble in the star's motions.

B. Scientists hope to learn more about how many stars are in space.

C. Scientists are familiar with some galaxies, but they do not know how many galaxies exist.

D. Scientist wonder if other plants can support life, and some scientist wonder if there are aliens.

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Chemistry

Desirae Allen

A chemical reaction, where more energy is released than is needed to get the reaction started, is called?

A)

A really amazing reaction

B)

Endothermic

C)

Exothermic

D)

Non-reactive

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Chemistry

Kelly Duke

How many molecules are in 8.3 moles?

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Chemistry

Noel Alvarado

When phenolphthalein indicator is added to a colorless solution with a pH of 10, a student observes and concludes that the tested solution

1

remains colorless and is basic

2.

remains colorless and is acidic

3.

turns pink and is basic

4.

turns pink and is acidic

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Chemistry

Bradley Watson

Which of these discoveries contradict components of dalton atomic theory? Check all of the boxes that apply

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Chemistry

Marissa Elliott

What 3 questions do toxicologist want to answer

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