Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?1) If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.

2) If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.

3) If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.

4) If the substance is a liquid or solid, the production of an odor would indicate a chemical change.

Answers

Answer 1

Answer:

Answer:

Explanation:

took the test on edge

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A maritime polar air mass is a cold air mass that forms over which two oceans

Answers

Answer:

The correct answer is Pacific and Atlantic oceans.

Explanation:

When an air body of a specific site or region reflects the temperature and other climatic condition of water and land it is known as air mass. The air substitutes heat with the water or the land, till the temperature of the air becomes equivalent to that of the surface underneath it. A maritime polar air mass refers to the air mass, which gets produced over the Northern Pacific oceans and the Northern Atlantic oceans. This is accountable for bringing a mass of cold air into the mentioned oceans.

northern atlantic and northern pacific oceans

As air passes over a body of water, some of the carbon stored in the water is transferred to the atmosphere. This process is called _________________________________

Answers

This process is called diffusion.

If salt is dissolved in water, water serves as the:a. solute.
b. solvent.
c. dissolved medium.
d. none of the above

Answers

b. solvent

solute is the substance being dissolved

What is the temperature of the oceanic crust?

Answers

The temperature of the oceanic crust increases with depth, reaching values typically in the range from about 500 °C(900 °F) to 1,000 °C (1,800 °F) at the boundary with the underlying mantle.

A sample of a white solid contains 0.212 g of magnesium and 0.140 g oxygen. What is the empirical formula of this compound?

Answers

In determining the empirical formula of a compound, you must convert the mass of each element to moles. Since the given mass for this problem is 0.212 grams of Magnesium and 0.140 grams of Oxygen, just divide the mass by the molar mass of Magnesium (24.305 g/mol) and Oxygen (16 g/mol).You’ll get 0.00872 moles of Magnesium and 0.00875 moles of Oxygen. You then divide the each mole value with the smallest calculated number of moles which is 0.00872. You will get an empirical formula of MgO.

Determine the half-life of potassium if in 3460 years a 200 g sample decayed into 25 g

Answers

$M=m_o*(1)/(2)^(t)/(T)\n M-mass\ aftter\ decay\n m-initial\ mass\n t-time\n T-period(half-life)\n 25=200*(1)/(2)^(3460)/(T)|:200\n (1)/(8)=((1)/(2))^(3460)/(T)\n ((1)/(2))^3=((1)/(2))^(3460)/(T)\n 3=(3460)/(T)\n T=1153(1)/(3)$

or easiest way
200g -----> 100g -------> 50g -----> 25g
We can that there were three decays.
1 decay ----------- x years
3 decays---------- 3460
$x=1153(1)/(3)$

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