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3 years ago

Measurements of the heights of various plants in an experiment are called

Chemistry

2 answers:

Bess [88]3 years ago

5 0

Answer:

Option 1 Data

podryga [215]3 years ago

4 0

Answer:

data

Explanation:

that is the answer

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true or false in a chemical reaction the same number of each type of atom will always be present before and after the reaction t

iren [92.7K]

Answer:

True

Explanation:

True because of the law of conservation of mass, the same same amount of atoms will be on both sides of the reaction.

6 0

2 years ago

Calculate the energy that is required to change 50.0 g ice at -30.0°C to a liquid at 73.0°C. The heat of fusion = 333 J/g, the h

OverLord2011 [107]

Answer:

There is 3.5*10^4 J of energy needed.

Explanation:

Step 1: Data given

Mass of ice at -30.0 °C = 50.0 grams

Final temperature = 73.0 °C

The heat of fusion = 333 J/g

the heat of vaporization = 2256 J/g

the specific heat capacity of ice = 2.06 J/gK

the specific heat capacity of liquid water = 4.184 J/gK

Step 2: Calculate the heat absorbed by ice

q = m*c*(T2-T1)

⇒ m = the mass of ice = 50.0 grams

⇒ c = the heat capacity of ice = 2.06 J/gK = 2.06 J/g°C

⇒ T2 = the fina ltemperature of ice = 0°C

⇒ T1 = the initial temperature of ice = -30.0°C

q = 50.0 * 2.06 J/g°C * 30 °C

q = 3090 J

Step 3: Calculate heat required to melt the ice at 0°C:

q = m*(heat of fusion)

q = 50.0* 333J/g

q = 16650 J

Step 4: Calculate the heat required to raise the temperature of water from 0°C to 73.0°C

q = m*c*(T2-T1)

⇒ mass = 50.0 grams

⇒ c = the specific heat of water = 4.184 J/g°C

⇒ ΔT = T2-T1 = 73.0 - 0 = 73 °C

q = 50.0 * 4.184 * 73.0 = 15271.6 J

Step 5: Calculate the total energy

qtotal = 3090 + 16650 + 15271.6 = 35011.6 J = 3.5 * 10^4 J

There is 3.5*10^4 J of energy needed.

8 0

3 years ago

Which atom in the ground state has an outermost electron with the most energy?(1) Cs (3) Li(2) K (4) Na

Leokris [45]

The answer is Cs, no. 2.
Cesium (Cs) is an element which has an outermost electron with most energy in the ground state.
Cesium (Cs), Lithium (Li), Potassium (K), and Sodium (Na) are elements which belong to the group 1 family, the alkali metals. Each has a valance of 1 and wants to release/ lose this e- (electron) to be isoelectronic with the nearest noble gas. Based on the periodic trends, an atom’s radii will raise going down a group.

8 0

3 years ago

Im in a big time rush, PLEASE HELP ME!! Answer this correctly

xz_007 [3.2K]

Answer:

GG= Green Gg= Green Gg=yellow

Explanation:

Whenever there is a dominant allele it will ALWAYS show, the recessive alleles or lowercase letters show when they are paired together

3 0

3 years ago

3. Hexane (C6H-2) is combusted in oxygen

Lapatulllka [165]

Answer:

a) 9.5 moles of Oxygen

b) 1.029 × 10²⁵ Molecules

Explanation:

The balance chemical equation for said reaction is as follow:

2 C₆H₁₄ + 19 O₂ → 12 CO₂ + 14 H₂O

According to equation,

2 moles of C₆H₁₄ are reacted with = 19 moles of O₂

So,

1 moles of C₆H₁₄ will react with = X moles of O₂

Solving for X,

X = 19 moles × 1 mole / 2 moles

X = 9.5 moles of Oxygen

For this part first calculate moles of hexane as;

Moles = Mass / M.Mass

Moles = 245.5 g / 86.18 g/mol

Moles = 2.84 mole of Hexane

Secondly, find the number of moles of CO₂ as,

According to equation,

2 moles of C₆H₁₄ produced = 12 moles of CO₂

So,

2.84 moles of C₆H₁₄ will produce = X moles of CO₂

Solving for X,

X = 12 moles × 2.84 mole / 2 moles

X = 17.09 moles of CO₂

Lastly, calculate the number of molecules of CO₂ as,

Number of Molecules = Moles × 6.022 × 10²³ molecules/mole

Number of Molecules = 17.09 moles × 6.022 × 10²³ molecules/mole

Number of Molecules = 1.029 × 10²⁵ Molecules

4 0

3 years ago