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Veronika [31]
4 years ago
15

Help me please............…

Chemistry
1 answer:
Simora [160]4 years ago
5 0

Answer:I think this is right: 1. 6 2. 12 3. 4 4. In the middle 5. Carbon 1. The one on the right 2a. Beryllium 2b. Aluminium

Explanation:The protons are the circles with plus signs and the black ones are nutrons. I looked on my periodic table for the rest.

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Which of the following molecules link together to form starch?
Phoenix [80]
The correct answer is A) Glucose

Polymers of Glucose are what we commonly call starch.
3 0
3 years ago
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The reaction Ba(NO3)2(aq) + Na2SO4(aq) >> 2NaNO3(aq) + BaSO4(s) goes to completion because a
Helen [10]

Answer:

2. precipitate is formed

Explanation:

In this reaction barium nitrate and sodium sulfate solutions react to form a barium sulfate precipitate.Barium and sulfate ions will react to give barium sulfate precipitate where as the sodium and nitrate ions are spectator ions.

The net ionic equation after removing unchanged ions from each side of the full ionic equation will be;

Ba²⁺+ SO₄²⁻ →  BaSO₄ (s)

3 0
3 years ago
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An experiment reveals that 125.0 grams of an unknown metal increases in temperature from 22.0 oC to 43.6 oC upon absorbing 640 j
nydimaria [60]

Answer:

                     Cp  =  0.237 J.g⁻¹.°C⁻¹

Explanation:

                      Amount of energy required by known amount of a substance to raise its temperature by one degree is called specific heat capacity.

The equation used for this problem is as follow,

                                                 Q  =  m Cp ΔT   ----- (1)

Where;

           Q  =  Heat  =  640 J

           m  =  mass  =  125 g

           Cp  =  Specific Heat Capacity  =  <u>??</u>

           ΔT  =  Change in Temperature  =  43.6 °C  -  22 °C  =  21.6 °C

Solving eq. 1 for Cp,

                                Cp  =  Q / m ΔT

Putting values,

                                Cp  =  640 J / (125 g × 21.6 °C)

                                Cp  =  0.237 J.g⁻¹.°C⁻¹

3 0
3 years ago
Limestone has a density of 2.72 g/cm3. What is the mass of 8.92 cm3 of limestone?
timurjin [86]
It should be 24.2624 because if there’s 2.72g in every cm3 and there are 8.92 cm3, then you simply multiply the two numbers
hope this helped :)
8 0
3 years ago
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1.
Novosadov [1.4K]

Answer: B. High precision

Explanation:

6 0
3 years ago
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