#1: Which of the following is an exothermic reaction? A. dissolving ammonium nitrate in water to cool the water B. condensation C. melting ice D. dissolving sugar in water. #2: Two objects (A and B) of the same temperature are in contact with each other. Which of the following statements is true? A. Heat transfers from object B to object A, because molecules from B collide with those from A. B. Heat transfers from object A to object B, because molecules from A collide with those from B. C. Although the molecules collide, no heat transfers because there is no temperature difference between the objects. D. No heat transfers, because there are no collisions between the molecules of the objects. #3: Which of the following parameters is kept constant in a coffee-cup calorimeter? A. temperature B. volume C. pressure D. kinetic energy #4: What type of substance would be best for use in a heating system? A. a liquid with a high specific heat B. a solid with a high specific heat C. a liquid with a low specific heat D. a gas with a low specific heat. #5: The reaction 2 NO(g) → N2(g) + O2(g) has a ΔH = -180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction? A. 644 kJ B. 180.5 kJ C. 301 kJ D. 322.3 kJ

Answers

Answer 1

Answer: These are the following answers to the five questions:
(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change.
(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects.
(3) (C) pressure
(4) (A) a liquid with a high specific heat
(5) Supposing the NO is measured at STP:
(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J

Answer 2

Answer:

(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change.

(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects.

(3) (C) pressure

(4) (A) a liquid with a high specific heat

(5) Supposing the NO is measured at STP:

(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J

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How many grams are in 4.5 moles of Li2O?

Answers

ur answer is 134.1 grams

A sample contains 6.25 percent parent isotope and 93.75 percent daughter isotopes. If the half-life of the parent isotope is 58 years, how old is the sample?

Answers

The parent isotope percent will change from 100% to 50% to 25% to 12.5% and to 6.25%. So the sample go through four times of half-life. So the sample is 58*4=232 years old.

Answer is: the sample is 232 years old.

Take 100 atoms:

After first half-life: 50% · 100 ÷ 100% = 50.

After second half-life: 0.5 · 50 = 25.

After third half-life: 0.5 · 25 = 12.5.

After fourth half-life: 0.5 · 12.5 = 6.25.

6.25 ÷ 100 · 100% = 6.25%.

4 half-lives will it take before only about 6.25% of the original sample remains.

t = 4 · 58 y.

t = 232 y.

Which of the following is a mixture?Carbon dioxide

Iron

Sugar

Sand

Answers

Of those options, the mixture would be sand.

Because it does not have the same properties, composition or appearance throughout the mixture. (Sand.)

Hope this helped! c:

1. Use the chemical equation of Photosynthesis to answer the following prompts.Answer in complete sentences.
6CO2 + 6H2O --> C6H12O6 +602
1. Identify evidence that a chemical reaction has occurred.
2. What element is the most abundant in this chemical reaction?
3. Identify the number of protons, neutrons, and electrons found in the most
abundant element.
4. Identify where we would find the protons, neutrons, and electrons in the
atom of this element.
5. Identify the group and period of the element on the Periodic Table.
swer

Answers

Answer:

1. The evidence that chemical reaction has occurred can be found in the change of the reagents present after the reaction, that is formation of glucose in the area where the reaction is taking place

2. The most abundant element of the chemical reaction is oxygen which has a total quantity of 18 atoms in the reaction

3. The oxygen atom has an atomic number of 8 and therefore contains 8 protons and 8 neutrons and (therefore) 8 electrons (to be neutral, electronically)

4. The protons and the neutrons of the atom, oxygen, are located in the nucleus, while the electron are found in the different orbitals surrounding the atom

5. The element, oxygen, symbol, O, belongs to the group 16 of period 2 in the periodic table

Explanation:

What is the ph at the equivalence point when 0.10 m hno3 is used to titrate a volume of solution containing 0.30 g of koh?

Answers

Answer;

pH = 7

Explanation;

HNO3 is a strong acid. KOH is a strong base. At the equivalence point, the solution will be neutral.
Therefore; the pH at the equivalence point when 0.10 m HNO3 is used to titrate a volume of solution containing 0.30 g of KOH will be 7.
The neutralization of a strong base with a strong acid gives a salt solution at the equivalence point. The salt contains ions that do not change the pH of water.

Answer:

pH at equivalence point will be 7

Explanation:

$HNO_(3)$ is a strong acid and KOH is a strong base. Hence a neutral salt would appear from acid-base reaction between them.
Acid-base reaction: $HNO_(3)+KOH\rightarrow KNO_(3)+H_(2)O$
At equivalence point, $KNO_(3)$ and water exists in medium.
As $KNO_(3)$ is a neutral salt therefore pH of medium will be equal to 7 (neutral).
So, pH at equivalence point will be 7.

What is the IUPAC name for the compound ZnO?

Answers

The IUPAC name for the compound ZnO is zinc oxide.

The International Union of Pure and Applied Chemistry (IUPAC) is responsible for standardizing the naming of chemical compounds to ensure uniformity and clarity in chemical nomenclature. In the IUPAC system, chemical names are based on the elements present in the compound and their respective oxidation states.

In the compound ZnO, "Zn" represents the element zinc, and "O" represents the element oxygen. The oxidation state of zinc in this compound is +2, and the oxidation state of oxygen is -2. To form a neutral compound, one zinc ion (Zn²⁺) combines with one oxide ion (O²⁻) in a 1:1 ratio. Therefore, the IUPAC name for the compound ZnO is "zinc oxide."

Zinc oxide is a white powder that is commonly used in various applications, such as in the production of rubber, ceramics, and cosmetics. It is also used as a pigment in paints and as an additive in food products. The IUPAC naming system ensures that scientists and chemists worldwide can communicate effectively about chemical compounds and their properties.

To learn more about IUPAC name, here

brainly.com/question/33646537

#SPJ6

it's
Zn=Zinc
and O=Oxide
so it will be Zinc Oxide

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