Chemical reactions can be detected by the formation of a gas.
a. True
b. False

Answers

Answer 1

Answer: A) True , production of a gas (new substance) during the reaction of two isotopes indicate a chemical reaction

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At normal atmospheric pressure, water freezes at:a. -20 °C
b. 0 °C
c. 100 °C
d. 120 °C

Answers

Water will freeze at 0°C so the answer is b

Hi there! Your answer would be B. 0°C. Just like water at a lake, that water is a liquid and when it freezess it eventually becomes a solid. Now, you could ice skate on the lake, but make sure that the water is absolutely frozen.

Formed when chemicals in the air get into rain and up the acidity levels

Answers

Acid Rain is formed when chemicals in the air get into rain and up the acidity levels!!!!!!

Hope this helps guys!

Answer:

yes acid rain

Explanation:

The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 3.00 g of butane?

Answers

First, calculate the number of mols of C4H10 in 3.00 g of C4H10.

3.00g C4H10 / 58.1 g C4H10 = .0516 mol C4H10
There are 4 atoms of carbon per mol of C4H10
Multiply .0516 mol C4H10 by 4 (number of atoms of carbon)=.20654 mol Carbon.
To convert to atoms, multiply that by avogadro's number, 6.022 x 10^23
which equals 1.2438 x 10^23 atoms of Carbon

Answer:

1.2433 *10^23 carbon atoms

Explanation:

First you need to calculate the grams of the empirical formula.

C4H10

Carbon = 12.01 g x 4

Hydrogen = 1.008 x 10

Sum those together to get = 58.12 g

Divide the 3.00g by the total g in the compound.

3.00/58.12 = 0.0516

Then times 0.0516 by the number of carbon atoms

0.0516 x 4 = .20646

Then multiple by Avogadro's number

.20646 x 6.022x10^23 = 1.2433x10^23

Rounded to 1.24x10^23 carbon atoms

Which element in the second period has the largest atomic radius? a potassium (K) b neon (Ne) c carbon (C) d lithium (Li)

Answers

The element in the second period that has the largest atomic radius is the Lithium (Li). The answer is letter D. As you go down the periodic table, the atomic radius increases and as you go across the periodic table, the atomic radius decreases.

Answer:

d lithium (Li)

Explanation:

Rank standard molar entropy without a data table? Without referring to a data table, rank the following compounds by standard molar entropy (highest to lowest). I can do it with a data table but not sure how to proceed without. Thank you for your help. N2(g) H2(g) C2H4(g)

Answers

I think the correct order from most entropy to least entropy is C2H4, N2, and H2. My reasoning is that C2H4 has the biggest number of microstates which means that it will have the most entropy since it. I then based N2 and H2 from there weights (which indicates size) since the larger something is the more microstates it is likely to have. I hope that helps. Let me know if anything is unclear or if you want me to add more detail.

Which of the following statements is true? a. Ag(s) reacts spontaneously with 1 M H+(aq). b. Ag(s) reacts spontaneously with Ni2+. c. Ag(s) reacts spontaneously with 1 M NO3– in 1 M H+(aq). d. Ni2+ reacts spontaneously with 1 M H+(aq) to form H2. e. Ni2+ reacts spontaneously with H2(g).

Answers

Answer:

Correct answer is a. Ag(s) reacts spontaneously with 1M H+(aq).

Explanation:

A charasteristic of metals is that they lose easily electrons, cations tends to gain electrons to react and anions tends to lose or share electrons to react.

If you want to make a chemical reaction you must to mix a reagent that tends to lose electrons with other that tends to gain them.

In the statement (a) we have a metal that loses electrons and a cation that can obtain them, so is the right answer.

note that the other optios have :

b) Metal with metal cation, not react beacause left a medium of reaction.

c) Both loses electrons

d) Both tends to gain electrons.

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FILL IN THE BLANK. HELPPPP!Weak bases react with _______ to form the hydroxide ion and the conjugate _______ of the base. Concentration in solution does not affect whether an acid or a base is _______ or weak.The strength of an acid or a base is determined by the _______ of the substance in solution. The acid dissociation constant, _______, is a quantitative measure of acid strength. A strong acid has a much _______ Ka than a weak acid. The Ka of an acid is determined from measured _______ values.Hydrochloric acid and sulfuric acid are _______ ionized in solution and are _______ acids. Ethanoic acid, which is only about 1 percent ionized, is a _______ acid. Magnesium hydroxide and calcium hydroxide are strong _______.