In an experiment, sulfuric acid reacted with different volumes of sodium thiosulfate in water. a yellow precipitate was formed during the reaction. a cross drawn at the base of each flask became gradually invisible due the formation of this yellow precipitate. the time taken for the cross to become invisible was recorded. a partial record of the experiment is shown.

experimental record

flask volume of

h2so4 volume of

sodium thiosulfate volume of

water time

1 5 ml 50 ml 0 ml 19 seconds

2 5 ml 40 ml 10 ml

3 5 ml 30 ml 20 ml

4 5 ml 20 ml 30 ml

based on your knowledge of factors that affect the rates of chemical reactions, predict the trend in the last column of the experimental record. use complete sentences to explain the trend you predicted. you do not have to determine exact values for time; just describe the trend you would expect (increase or decrease) and why it occurs.

The time needed for the reaction will increase.

Explanation:

Rate of chemical reaction α [reactants].

∴ Rate of the reaction = k[H₂SO₄][thiosulfate].

where, k is the rate constant of the reaction.

Rate α [thiosulfate]

Rate of the reaction = - Δ[thiosulfate]/Δt.

∴ The time needed for the reaction will increase from flask 1 to flask 5.

120,630,890

step-by-step explanation:

110+10=120,620+10=630,880+10=890

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.