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Alisiya [41]
4 years ago
11

List the following elements in order of INcreasing number of valence electrons: C, Cl, As, Na, He

Chemistry
1 answer:
Murljashka [212]4 years ago
7 0

Answer:

He, Cl, As, C, Na

Explanation:

^^

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Which of the following is not an essential element for healthy plant growth?
GREYUIT [131]

Answer:

A oxygen

Explanation:

For plant growth nitrogen, potassium and phosphorous are the three main elements needed. oxygen is expelled from plants. Plants doesn't need oxygen

8 0
3 years ago
A 312 g sample of a metal is heated to 277.845 °C and plunged into 200 g of water at a temperature of 11.945 °C. The final tempe
tigry1 [53]

Answer:

The specific heat capacity of the metal is 1.307 J/g °C

Explanation:

<u>Step 1:</u> Data given

mass of the metal = 312 grams

initial temperature of the metal ( before plunged in the water) = 277.845 °C

initial temperature water = 11.945 °C

Final temperature of water (and aslo the metal) = 99.062 °C

Specific heat capacity of wayer = 4.184 J/g °C

<u>Step 2:</u>  Calculate the specifi heat capacity of the metal

Loss of Heat of the Metal = Gain of Heat by the Water

Qmetal = -Qwater

m(metal) * C(metal) * ΔT(metal) = - m(water) * C(water) * ΔT(water)

with mass of metal = 312 grams

with C(metal) = TO BE DETERMINED

with ΔT (metal) = 99.062 - 277.845 = -178.783 °C

with mass of water = 200 grams

with C(water) = 4.184 J/°C * g

with ΔT (water) = 99.062 - 11.945 = 87.117 °C

312 * C(metal) * -178.783  = - 200* 4.184 * 87.117

C(metal) = -72899.51 / 55780.296 = 1.307

The specific heat capacity of the metal is 1.307 J/g °C

6 0
3 years ago
An engineer is trying to create a fast reaction in a fuel mixture. Which should she do? A. Decrease the amount of fuel B. Lower
oksano4ka [1.4K]
To increase the rate of a reaction, you can either do any of the following:
-increase the temperature
-increase concentration of the aqueous reactant
-increase pressure of the gas
-use a catalyst
-increase surface area of the solid reactant

From these, the engineer should therefore do C. Adding a catalyst speeds up the reaction without really joining the reaction.
3 0
4 years ago
Janet runs 6.4 miles in one hour. Is it speed or velocity or acceleration
Murrr4er [49]

Answer:

acceleration

Explanation:

6 0
3 years ago
What happens when carbon dioxide is cooled to 780C?<br>Where is carbon dioxide found in nature?​
g100num [7]

Answer:

When Carbon dioxide gas is compressed at room temperature and the pressure is suddenly released, then it solidifies to form dry ice which is also known as solid carbon dioxide. It directly converts from solid state to gaseous state without melting to liquid state.

Explanation:

3 0
3 years ago
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