Isotopes of an element contain different numbers of

BRAINLIESTTTT ASAP!!! PLEASE HELP MEEEE :)

Scilla [17]

Precise is the close proximity of repeated measurements. In order to be precise, you need two or more measurements.

Accurate is the close proximity to the real (or expected) measurement.

For Example:

You are at the grocery store buying watermelons. The sign says that the watermelons all weigh 2 lbs. You weigh 3 of them on the scale next to the watermelon display. Their weights are 1.77, 1.80, and 1.82.

→ The scale is precise because it weighs all 3 of them at nearly the same value.

→ The scale is not accurate because their weights are not close to the expected value of 2.0

You take one of the watermelons to the cashier. The scale at the checkout counter weighs it as 1.99. The scale at the checkout counter is accurate. You cannot determine the precision of the scale at the checkout counter because you have no other values to compare it to.

Answer: Precise CANNOT be determined by one measurement.

Accurate CAN be determined by one measurement.

4 0

4 years ago

Which type of scientist would most likely investigate how to synthesis materials found in plants

denis23 [38]

Botanist is the type of scientist that studies materials found in plants

4 0

3 years ago

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Pls help and i will mark brainliest

myrzilka [38]

Answer:

No. 3 lithium

Explain that lithium has 3 protons and 3 electrons. There are 2 electrons on the first energy level and 1 electron on the second

No. 4 Hydrogen (H) and helium (He) have a valence shell containing one and two electrons respectively. They make up the first period (row) of the periodic table. Their valence electron/s are in the first energy level (n=1) , as is denoted by 1s1 and 1s2 .

That's all i dont know if this is right though. 

6 0

3 years ago

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Two reactions and their equilibrium constants are given. A + 2 B − ⇀ ↽ − 2 C K 1 = 2.79 2 C − ⇀ ↽ − D K 2 = 0.186 Calculate the

vfiekz [6]

Answer:

K=1.93

Explanation:

Given reactions are:

A +2B ⇄ 2C K1=2.79

2C ⇄ D K2=0.186

D⇄ A+ 2B K=?

If we reverse the reaction then the euillibrium constant also become reciprocal of original value:

3rd reaction is a combination of reciprocal of 1st and 2nd reaction

2C⇄A +2B 1/K1;........................1

D ⇄ 2C 1/K2; ..............................2

On adding 1 and 2

D ⇄A +2B $K=\frac{1}{K1} \times\frac{1}{K2};$

$K=\frac{1}{2.79} \times\frac{1}{0.186};$

K=1.93

4 0

3 years ago

How many grams of CO2 are produced by burning 8.32g of C4H10?

inysia [295]

$\,\,\, \,\,\, 8.32\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\\ 2C_4H_1_0+9O_2\to 8CO_2+10H_2O \\ \,\,\, \,\,\,\,\,58\cdot2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,44\cdot8 \\ \\ \frac{8.32}{58} = \frac{x}{44} \\ \\ x= \dfrac{8.32\cdot44\cdot8}{58\cdot2} =25.2\,\,g$

Answer: 25.2 g.

4 0

3 years ago