Chemistry » Page 39

Chemistry

Jude Barber

Many substances can go through physical and chemical changes. Which of the following is an example of a physical change? Question 6 options: using heat and oxygen to burn wood using heat to scramble an egg mixing CO2, water, and sugar to form soda mixing baking soda with vinegar to form CO2

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Chemistry

Elliot Dorsey

Which contains more molecules: a mole of hydrogen or a mole of chlorine

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Chemistry

Darion

How are sex chromosomes different from other chromosomes

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Chemistry

Howe

If we place the like poles of two magnets facing each other what will happen?

A. Nothing

B. They will both become negative.

C. They will attract each other.

D. They will repel each other.

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Chemistry

Bridget English

What is the percentage of water to the nearest tenth in this compound? Ba (OH) 2 * 8H2O

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Chemistry

Brendan Cox

What term describes the specific amount of time required for half of a radioactive substance to become stable

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Chemistry

Tobias Acosta

H2 + N2 - - - > NH3

For this unbalanced chemical equation, what is the coefficient for hydrogen when the equation is balanced?

A. 1

B. 2

C. 3

D. 4

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Chemistry

Silvester

What is the density of a block of marble that occupies 311 cm cubed and has a mass of 853 g?

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Chemistry

Ace Levy

Explain how pressure affects a scuba diver rising to the surface

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Chemistry

Trevin Taylor

1) What is the mass of 5.24 moles of Fe504-7H2O?

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Chemistry

Friendo

The name given to the change of state from gas to liquid is

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Chemistry

Rashad Hawkins

How many molecules of carbon dioxide, CO2, are present in 388.1 grams?

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Chemistry

Abbie

Radioactive elements will continue to decay until

A. They have a stable nucleus

B. They have a full octet of electrons

C. They have a neutral electrical charge

D. They have the same number of electron and protons

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Chemistry

Barrett Skinner

Which one of the following elements is stable?

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Chemistry

Lennon

Which statement best describes waves? A. Waves can only travel in empty space B. Waves cannot propagate without medium C. Waves can carry energy through matter and space

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