CHEMISTRY HIGH SCHOOL

A catalyzed reaction will have a ____ activation energy, and this leads to a _____ in the reaction rate. A) lower, decrease
B) lower, increase
C) higher, decrease
D) higher, increase

Answers

Answer 1
Answer:

I chose d and got it wrong. The correct answer is b.
Answer 2
Answer: The answer is D, a catalyst speeds up the reaction rate so a catalyzed reaction will have higher activation energy thus and increase in rate of reaction.

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Exactly 1/16 of a given amount of protactinium-234 remains after 26.76 hours. What is the half life of protactinium-234?

Answers

This is a problem involving half-lives. We can solve this problem by using the equation as shown: A=Aoe^-(ln2/t)T where A is the final amount (1gram *assumed), Ao is the initial amount (16g *assumed), t is the half-life *required) and lastly T time elapsed (26.76h). Plug in the values in the equation and you should get  6.69 hours. 

The periodic table is based on an element'sa. atomic number.
b. atomic mass.
c. molecular size.
d. molecular mass.

Answers

The periodic table of the elements is arranged based on the elements' atomic numbers, starting with 1 (hydrogen) in the top left corner.

Every atom of the _______ carbon has 6 protons.

Answers

The answer is element. Elements consist of identical atoms, which differ between elements. Atoms are the basic units of matter. They are made up of protons, neutrons, and electrons. Carbon is an element. It contains only of carbon atoms. Every atom of element carbon consists of 6 protons.Hope this helps. Let me know if you need additional help!

Answer: Element

Explanation: hope this helps :3

True or false Diprotic acids lose both hydrogens at the same time

Answers

Best Answr : Falsee im sureee .

According to Bohr's model, what can be said of the amount of energy that an electron absorbs when it is excited compared to the amount of energy that it releases when it returns to ground state?A. The amount of energy that is absorbed is greater than the amount of energy that is released.

B. The amount of energy that is absorbed is the same as the amount of energy that is released.

C. The amount of energy that is absorbed is less than the amount of energy that is released.

Answers

letter b. because energy can't be created nor destroyed

The element in Period 4 and Group 1 of the Periodic Table would be classified as aA. metal
B. metalloid
C. nonmetal
D. noble gas

Answers

The element in period 4 and group 1 of periodic table is potassium which is a metal.

How do metallic properties vary in periodic table?

An element is said to possess metallic properties if it has 1,2,3 electrons in its valence shell as these number of electrons can be easily removed by supplying less amount of energy .

Elements present in group 1,2,3 have 1,2,3 valence electrons respectively.Hence, these elements are metals and  it is a characteristic property of metals to easily loose electrons.

Hence group 1, 2  are metals which comprises the s-block  of the periodic table.Metallic properties increases  down the group as distance between valence electrons and nucleus increases due to which they can be easily removed.

Metallic propertiesdecrease along  a period as electrons are added to same shell and hence cannot be easily removed.

Learn more about metallic properties,here:

brainly.com/question/723620

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K. Pottasium is in period 4 and group 1. It would be classified as an Alkali metal, and its a metal! 
A.
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