CHEMISTRY HIGH SCHOOL

Identify which statement is true:A. Isotopes of the same element have the same atomic number and mass number, but a different number of neutrons.
B. Isotopes of the same element have the same mass number and different atomic numbers.
C. Isotopes of the same element have the same number of neutrons and a different number of protons.
D. Isotopes of the same element have the same atomic number and different mass numbers.

Answers

Answer 1
Answer:

D. Isotopes of the same element have the same atomic number and different mass numbers.
Answer 2
Answer:

Answer: C. Isotopes of the same element have the same number of neutrons and a different number of protons.

Explanation: Founders Educere answer.

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Which reactant is common to many burning reactions?

Answers

Answer:

Combustion reactions must have oxygen as a reactant. Note that the water that is produced is in the gas rather than the liquid state because of the high temperatures that accompany a combustion reaction.

Explanation:

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Freezing requiresa. the removal of energy.
b. the absorption of energy.
c. no energy change.

Answers

Answer:

The correct answer is option a. the removal of energy.

Explanation:

Hello!

Let's solve this!

Freezing is a process by which a lot of heat is lost, this loss of heat leads to a loss of energy as well. It means that energy is eliminated so that heat loss occurs.

Therefore the correct answer is option a. the removal of energy.

What is your question? HIGH SCHOOL CHEMISTRY 5+3 pts To ensure that the air in the shuttle remains free of excess CO2, engineers test the air-purification system. They combine 1.000 × 103 g LiOH with 8.80 × 1 02 g CO2. The reaction produces 3.25 × 102 g H2O. What is the limiting reactants in this test reaction

Answers

The balanced reaction is:

2LiOH + CO2 = Li2CO3 + H2O

We are given the amount of the reactants to be reacted. This will be the starting point of our calculations. To determine the limiting reactant, we convert the amounts from grams to moles.

1.000 × 10^3 g LiOH  (1 mol / 25.95 g) = 38.54 mol LiOH

8.80 × 10^2 g CO2 ( 1mol / 44.01 g) = 20.00 mol CO2

From the balanced reaction, the molar ratio of the reactants is 2:1. This means that every two mole of lithium hydroxide, 1 mole of carbon dioxide is needed. It is clear that, from the given amounts, CO2 is the limiting reactant.

CO2 is the limiting molecule.

Calculate the decrease in temperature when 2.00 L at 20.0 °C is compressed to 1.00 L.

Answers

We assume that this substance is in an ideal state. Then, we can use the ideal gas equation which is expressed as: PV = nRT. Comparing the first and second conditions of the substance, we can say that the number of moles and the pressure remains the same. We can solve the problem as follows:

P1V1 = n1RT1
P2V2 = n2RT2

Since P and n are the same for the conditions, we can combine the equations.

T1/V1 = T2/V2
20.0/2 = T2/1
T2 = 10.0 °C

Which of the following statements is true?Mutations provide organisms with what they "need" to survive.

Microevolution is based on fossils, geology, and comparisons to living organisms.


Both plants and animals are autotrophs because they can make their own food.

Parasites often show cospeciation because they must evolve with ther hosts.

Answers

Answer:

Parasites often show cospeciation because they must evolve with ther hosts.

Explanation:

How many atoms are contained in 1 mole of silver

Answers

3 atoms! Glad I can help! :)
3 atoms are contained in 1 mole of silver
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