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3 years ago

Will marks brainly if it isn’t a copied answer!!!

Chemistry

2 answers:

Neporo4naja [7]3 years ago

5 0

What kind of control like scientific?

Dmitry_Shevchenko [17]3 years ago

3 0

A control group in an experiment is very important. It is the group in an experiment that is separated from the rest of the experiment that’s being tested with the independent variable. It’s important for many reasons. The main reason is because using a control group, you can see the difference that an independent variable makes on the experiment. If we didn’t have a control group, you wouldn’t know how the group that is being tested is any different after the experiment than it was before. The control group gives you something to base it off. The control group is the group that doesn’t change. For example, in an experiment, if we want to test a plant fertilizer, we would have a control group and the group being tested. We would give the control group just water and no fertilizer. The other group that we are testing, we would give the plant fertilizer to. After a certain period of time, if the control group plants grow slower than or not as well as the group using the fertilizer, we know that the fertilizer works, if the opposite is true than the fertilizer doesn’t work.

Hope that helps u!

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What is the speed 0.36 km/h in cm/s

azamat

Answer:

It's 10 cenimeters per second

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3 years ago

How do strong southerly winds affect the vapor pressure?

dedylja [7]

Answer:

An increase

Explanation:

The strong southerly winds affect the vapor pressure by increasing it .

When the vapor pressure increases it means an increase in temperature and more evaporation occurs.

A decrease in the vapor pressure means a reduction in temperature with less amount of evaporation being involved

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3 years ago

Difference between hygroscopic and deliquescent substance with of each

iVinArrow [24]

Answer:

The water soluble substance which absorb moisture from the air and then dissolve on the absorbed moisture to change into liquid taste are called deliquescent substances whereas the substances which absorb moisture from air but do not change their state are called hygroscopic substances.

7 0

3 years ago

Read 2 more answers

a 25 ml volume of a sodium hydroxide solution requires 19.6 mL of a 0.189 M HCl acid for neutralization. A 10 mL volume of phosp

Drupady [299]

Answer: 0.172 M

Explanation:

a) To calculate theconcentration of base, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $HCl$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=1\\M_1=0.189M\\V_1=19.6mL\\n_2=1\\M_2=?\\V_2=25mL$

Putting values in above equation, we get:

$1\times 0.189\times 19.6=1\times M_2\times 25\\\\M_2=0.148$

b) To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_3PO_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=3\\M_1=?\\V_1=10mL\\n_2=1\\M_2=0.148\\V_2=34.9mL$

Putting values in above equation, we get:

$3\times M_1\times 10=1\times 0.148\times 34.9\\\\M_1=0.172M$

The concentration of the phosphoric acid solution is 1.172 M

3 0

3 years ago

Explain why is sodium less reactive than potassium

leva [86]

Answer:

As potassium is larger than sodium, potassium's valence electron is at a greater distance from the attractive nucleus and is so removed more easily than sodium's valence electron. As it is removed more easily, it requires less energy, and can be said to be more reactive.

Explanation:

Hope you're having a splendiferous day.

Just a bored kid willing to help...

8 0

3 years ago