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Chemistry

The most abundant gas in the Earth's atmosphere is:

A. hydrogen

B. oxygen

C. nitrogen

D. carbon dioxide

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Chemistry

The element chlorine has an atomic weight of 35.5 and consists of two stable isotopes chlorine-35 and chlorine-37. The isotope chlorine-35 has a mass of 35.0 amu and a percent natural abundance of 75.5 %. The isotope chlorine-37 has a percent natural abundance of 24.5 %. What is the mass of chlorine-37? amu

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Chemistry

How many moles of atoms are in 9.00 g of 13c?

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Chemistry

Question 1

Which of the following is a possible ground-state electron configuration?

[Xe] 6s24f145d106p2

[Kr] 5s24d85p3

[Xe] 6s25d106p4

[Kr] 5s25d105p5

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Mitchell Jordan

Chemistry

Complete the following reactions using word and balanced equations including states.

Dilute phosphoric acid is added with a calcium hydroxide solution.

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Maryjane Graham

Chemistry

1. What is the smallest unit of life in all living things called?

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Chemistry

What is the mass of 0.50 mole of copper?

63.5 grams

O 32 grams

3.2 grams

2.18 grams

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Chemistry

How many years have the earth

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Chemistry

What is the lowest atomic number a new element can have

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Chemistry

H2O2, hydrogen peroxide, naturally breaks down into H2O and O2 over time. MnO2, manganese dioxide, can be used to lower the energy of activation needed for this reaction to take place and, thus, increase the rate of reaction. What type of substance is MnO2?

a. a reactant

b. an inhibitor

c. an enhancer

d. a catalyst

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Chemistry

Which equation is an example of the synthesis reaction

CaO+CO2---> CaCO3

2NaCL - -> 2Na+Cl2

HCI+N aOH - --> NaCL+H2O

Mgl2+Cl2 - -> MgCL2+l2

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Charlee Thornton

Chemistry

A chemist weighed out 20.7 g of sodium. Calculate the number of moles of sodium she weighed out

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Chemistry

Molecules move slowest when carbon dioxide is in which form?

A. liquid carbon dioxide

B. solid carbon dioxide

C. carbon dioxide gas

D. plasma carbon dioxide

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Chemistry

What is the best explanation of why the iron found in the inner core of the Earth remains in the solid state even though the temperature in the inner core is roughly 5700 °C?

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Alessandro Ramirez

Chemistry

If two poisonous elements are combined chemically, which of the following will be true of the resulting compound? The compound will be as poisonous as the elements, based on the chemical properties of the two elements.

The compound will be more poisonous than the elements, based on the chemical properties of the two elements.

The compound will not be poisonous, based on the chemical properties of the new substance.

The compound may or may not be poisonous, depending on the chemical properties of the new substance.

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