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3 years ago

Using one or more of your senses to gather information is called

2 answers:

3 0

An observation.

An observation can be a stated or written statement, remark or comment that is based on what was heard, seen, tasted, felt or smelled. Observations are very important in experimentation. To make an observation is considered as the central element in a scientific process or method. This is a skill that scientist ought to be good at.

Darya [45]3 years ago

3 0

Answer:

Observing

Explanation:

An observation can be a stated or written statement, remark or comment that is based on what was heard, seen, tasted, felt or smelled. Observations are very important in experimentation. To make an observation is considered as the central element in a scientific process or method. This is a skill that scientist ought to be good at.

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A chemist has two solutions of H2SO4. One has a 40% concentration and the other has a 25% concentration.

vodomira [7]

Answer:

16 liters of the solution with 40% concentration must be mixed with 62 liters of the solution with 25% concentration in order to obtain 78 liters, 25% concentration solution.

Explanation:

Let the required volume of solution 1 be represented by x.

The required volume of solution 2 would then be 78-x.

The number of moles of solution 1 that would be required = 0.4x

The number of moles of solution 2 that would be required = 0.25(78-x)

The number of moles of the final mixture = 78 x 0.28 = 21.84

moles of solution 1 + moles of solution 2 = moles of final mixture

0.4x + 0.25(78 - x) = 21.84

0.4x + 19.5 - 0.25x = 21.84

0.4x - 0.25x = 21.84 - 19.5

0.15x = 2.34

x = 15.6 liters

To the nearest tenth = 16 liters

Liters of 40% solution needed = 16 liters

Liters of 25% solution needed = 78 - 16 = 62 liters.

Hence, 16 liters of the solution with 40% concentration must be mixed with 62 liters of the solution with 25% concentration in order to obtain 78 liters, 25% concentration solution.

7 0

3 years ago

What is the molar mass of water in the hydrate

zaharov [31]

Answer: The molar mass of water in the hydrate is 126.14.

Explanation:

4 0

3 years ago

Please i beg you. please

Reil [10]

Answer:

A short-term environmental change is drought, smog, flooding, volcanic eruption, blizzards, and pollution this could happen in anyone of the food webs. That may effect how they will end up having to have to adapt to their environment so that they can continue to live there and not die off.

Explanation:

I don't know the second one

7 0

3 years ago

Read 2 more answers

Who know the answer

bekas [8.4K]

First, let's explain the variables. F means force, m means mass, and a means acceleration. F is measured in Newotns [N], mass is measured in kilograms [kg], and acceleration in measured in meters per squared second [m/s²].

Now let's mover on the first problem.

Given

m = 1000 kg

a = 3 m/s²

According to the second law of Newton, the force is equal to the acceleration multiplied by the mass.

$F = am\\F = 3 * 1000\\F = 3000 N$

The answer is 3000 N.

The second problem is smiliar.

Given

m = 70 kg

F = 250 N

We use the same formula from before, and use a bit of algebra to adapat it to our needs.

$F = ma\\\frac{F}{m} = a\\a = \frac{F}{m}\\a = \frac{250}{70} \\a = 24\frac{1}{7} m/s^{2}$

The answer is 24 1/7 s/m^2.

6 0

3 years ago

How many atoms are in NH₄C₂H₃O₂? Sorry, I'm confused because there are two "H"s: H₄ and H₃. Please explain if this would just be

krek1111 [17]

Answer:

Explanation:

NH=4

C=2

H=3

O=2

4 0

3 years ago