Evaluate each of the following:

c. 4 × (–2) + 6 = __________

An alloy contains 67 g of pure gold and 35 g of pure zinc. What is the percentage of zinc in the alloy? Express your answer to the ones place.

Use the following graph for problems 1.23 and 1.24:

How many minutes were needed to reach a temperature of 45 °C?

Write each of the following in scientific notation:

e. 0.0072

Write each of the following in scientific notation:

f. 670 000

Which number in each of the following pairs is larger?

a. 7.2 × 10³ or 8.2 × 10²

Which number in each of the following pairs is smaller?

a. 4.9 × 10^-3 or 5.5 × 10^-9

A container was found in the home of the victim that contained 120 g of ethylene glycol in 450 g of liquid. What was the percentage of ethylene glycol? Express your answer to the ones place.

If the toxic quantity is 1.5 g of ethylene glycol per 1000 g of body mass, what percentage of ethylene glycol is fatal?

A bag of gumdrops contains 16 orange gumdrops, 8 yellow gumdrops, and 16 black gumdrops.

a. What is the percentage of yellow gumdrops? Express your answer to the ones place.

Use the following graph for problems 1.55 and 1.56:

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d. Does the solubility of carbon dioxide increase or decrease with an increase in temperature?