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3 years ago

9

Need help !!!!! ASAP

1 answer:

Galina-37 [17]3 years ago

8 0

Answer:

Barometer.

Explanation:

A barometer is a scientific instrument used to measure air pressure. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems and frontal boundaries.
There are many types of barometers: water-based barometers, mercury barometers, vacuum pump oil barometer, and aneroid barometers.

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A 20.00-mL sample of a weak base is titrated with 0.0568 M HCl. At the endpoint, it is found that 17.88 mL of titrant was used.

nata0808 [166]

Answer: 0.0508mL

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therefore concentration of the base is 1.0156/20 = 0.0508 mL

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3 years ago

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)?

Travka [436]

That would be A.

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4 years ago

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3 years ago

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Alex73 [517]

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3 years ago

What element has 80 protons, 81 neutrons, 79 electrons?

Mariana [72]

Answer:

The element will be $^{161}_{80}X$

Explanation:

Given that,

Number of proton = 80

Number of neutron = 81

Number of electron = 79

We know that,

The atomic number is equal to the number of proton.

So, the atomic number is 80.

According to atomic number,

The element will be mercury.

We need to calculate the atomic mass

Using formula of atomic mass

$atomic\ mass=atomic\ number+number\ of\ neutron$

Put the value into the formula

$atomic\ mass=80+81$

$atomic\ mass=161$

We need to find the element

Using atomic mass and atomic number

$atomic\ mass\ number A=161$

$atomic\ number Z=80$

So, the element will be

$^{A}_{Z}X$

Put the value of A and Z

Hence, The element will be $^{161}_{80}X$

5 0

3 years ago