CHEMISTRY MIDDLE SCHOOL

PLS ANSWER BEFORE MIDNIGHT 20 POINTS

Answers

Answer 1

Answer:

Answer:

See the answer and the resolution below

Explanation:

The equation of the decomposition of magnesium carbonate is as follows:

Mg C03 (white solid) ---> C02 (gas) + Mg= (solid)

To calculate the mass of carbon dioxide produced, the weight of 1 mol of this and 1 mol of MgC03 is calculated. Then a simple rule of 3 is made.

Weight 1 mol of MgC03= Weight Mg + Weight C+ 3x(Weight 0)= 24,305g+ 12,017+3x (15,999)= 84, 318g/mol

Weight 1 mol of C02= Weight C + 2x(Weight 0)=12,017+2x (15,999)= 44, 008g/mol

84, 319 g MgC03------44,008g C02

36,0 g MgC03------X= (36,0 g MgC03x44,008g C02)/84, 319 g MgC03= 18,8 g C02

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True or false in general, winds are named for the direction from which they blow TrueFalse
An empty party balloon will float to the ceiling of a room once it is filled with helium.A. What does this tell you about the density of air in the room compared to the density of helium?B. For the balloon to float in air, what two factors might have changed about the balloon?Answer those two questions of you know the answer.
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If the total mass of the products of a reaction is 250 g, what was the total mass of the reactants

On the galapagos islands, Darwin studied many creatures, including finches. Explain what he observed and how it relates to nature selection.

Answers

Darwin observed the beaks of the birds and how the different beaks helped the birds to eat different types of seeds.

This relates to natural selection because certain finches with say a smaller shorter beak would be able to eat only smaller seeds and fruits as to where a finch with a longer larger beak could eat larger bigger seeds and fruits.

Hope this helped! Have a great day!

Answer number 15 to get 20 points

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corundum because it is hard and glassy

What energy convertion happens when green plants use energy from the sun to make sugar?

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The energy conversion happening here is known as photosynthesis. Photosynthesis is a process where the leaves of a plant absorb water and carbon dioxide, then, using light energy from the sun, convert that into oxygen and sugar.

How would you expect energy to change during a chemical reaction? A) Energy will be increased
B) Energy will be converted into another form
C) Energy will be consumed
*THIS IS NOT PART OF A TEST, I GOT THE ANSWER WRONG AND WANT TO KNOW THE RIGHT ONE*

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B. The energy will be converted into another form. In chemical reactions energy is usually changed to heat or light energy. This is an example of the First Law of Thermodynamics which states that energy can not be created or destroyed.

Review the types of elements that create ionic bonds aswell as the types of elements that create covalent bonds.
• N2 • CCl4 • SiO2
• AlCl3 • CaCl2 • LiBr

Answers

Answer:

N2 Covalent

CCl4 Covalent

SiO2 Covalent

AlCl3 Covalent

CaCl2 Ionic

LiBr Covalent

Explanation:

With covalent bonds, there is a sharing of electron pairs between the atoms.

With ionic bonds, there is complete transfer of valence electrons between atoms. Formed by the interaction of a metal with a non-metal.

Where:

Electrons aren't transferred in covalent bonds.

Protons aren't transferred in covalent bonds

Protons aren't shared in covalent bonds

N3-

C4+

Cl-

Si4+ = Metal

O2- = Non-metal

Al3+ = Metal

Li+ = Metal

Ca2+ = Metal

Br 1-, 1+, 5+ = Halogen

N2 = N3- and N3- Covalent

CCl4 = C4+ and Cl- x4 Covalent

SiO2 = Si4+ and O2- x 2 Metal with non metal Covalent

AlCl3 = Al3+ and Cl- x 3 Covalent Though this one is complex as to why because it seems like it should be ionic

CaCl2 = Ca2+ and Cl- x 2 Metal with non-metal Ionic

LiBr = Li+ and Br- Covalent as neither is a non-metal

You have 17 grams of water and you increase the temperature by 15 degrees Celsius how many joules did this take?a. 255
b. 1067
c. 1.13
d. 63

Answers

Answer: the correct answer is option(d).

Explanation:

Energy required ,Q= ?

Mass of water , m = 17 grams

Temperature difference or $\Delta T$ = 15 °C

Specific heat value of water = 4.186 J/g °C

$Q=mc\Delta T=17* 4.186 J/g^oC* 15^oC=1,067.43 J\approx 1,067 J$

From the given value the , nearest value to to our calculated answer is 1067 J that option (b).

Hence, the correct answer is option (d).

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Which of the following best describes a mixture? *two or more substances combine and cannot be separatedtwo or more substances combine chemicallytwo or more substances combine but keep their physical propertiestwo or more substances combine and create an irreversible reaction

Veronica’s velocity was measured as 4.3 m/s. She displaced 20 meters in 4.7 seconds. Which piece of information is missing for the correct calculation of velocity?A) the directionB) the end point

What was helium used for in the past?