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miss Akunina [59]
3 years ago
6

The pictures are the answers

Chemistry
1 answer:
Mice21 [21]3 years ago
4 0

Answer:

C.

Explanation:

If the students want to know at what percent of CO2 in the air the plant will grow at the fastest, then the percent of CO2 should be a different value for each plant in the table.

There are 2 tables that have different values for the CO2 - the tables in answer choices C and D.

Since the students only want to know how the amount of CO2 affects the plant, every other variable should remain constant.

The only answer choice that has a changing value for the percent of CO2 and a constant value for every other variable is C.

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No polysaccharides are complex forms of  carbohydrate of long sugar molecules 
7 0
2 years ago
When the pressure of a gas decreases, which quantity will increase, assuming all other variables are held constant?
frosja888 [35]

I don't think the answer is in one of the options- unless I am reading it wrong and there is a 'V' option.

The volume (V) of gas increases when the pressure of the gas decreases assuming all the other variables are held constant.

I hope this helps!

7 0
3 years ago
Question 25 a chemist determined by measurements that 0.020 moles of mercury participated in a chemical reaction. calculate the
sammy [17]
To solve this question, we first need to know the mass of one mole of mercury. This can be done by checking the periodic table.

From the periodic table, we can see that:
molar mass of mercury = 200.59 grams/mole.

From the measurements, the chemist found that the participated amount of mercury is 0.02 moles.

We can simply determine the mass of 0.02 moles by doing cross multiplication as follows:
mass of 0.02 moles = (0.02 x 200.59) / 1 = 4.0118 grams

Rounding the answer to 2 significant digits, we get:
mass of 0.02 moles = 4.01 grams
4 0
3 years ago
Density, Mass, or Volume can be used to identify an unknown substance
Delicious77 [7]
Density because a substance always has the same density, but mass can be different and volume depends on mass
6 0
3 years ago
Nickel carbonyl, Ni(CO)4 is one of the most toxic substances known. The present maximum allowable concentration in laboratory ai
vodomira [7]

<u>Answer:</u> The mass of Ni(CO)_4 allowable in the laboratory is 4599.5 grams

<u>Explanation:</u>

To calculate the volume of cuboid, we use the equation:

V=l\times b\times h

where,

V = volume of cuboid

l = length of cuboid = 14 ft

b = breadth of cuboid = 22 ft

h = height of cuboid = 9 ft

Putting values in above equation, we get:

V=14\times 22\times 9=2772ft^3=78503.04L     (Conversion factor:  1ft^3=28.32L

To calculate the moles of gas, we use the equation given by ideal gas which follows:

PV=nRT

where,

P = pressure of the gas = 1.00 atm

V = Volume of the gas = 78503.04 L

T = Temperature of the gas = 23^oC=[23+273]K=296K

R = Gas constant = 0.0821\text{ L. atm }mol^{-1}K^{-1}

n = number of moles of hydrogen gas = ?

Putting values in above equation, we get:

1.00atm\times 78503.04L=n\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 296K\\\\n=\frac{1.00\times 78503.04}{0.0821\times 296}=3230.4mol

Applying unitary method:

For every 109 moles of gas, the moles of Ni(CO)_4 present are 1 moles

So, for 3230.4 moles of gas, the moles of Ni(CO)_4 present will be = \frac{1}{109}\times 3230.4=26.94mol

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of Ni(CO)_4 = 26.94 moles

Molar mass of Ni(CO)_4 = 170.73 g/mol

Putting values in above equation, we get:

26.94mol=\frac{\text{Mass of }Ni(CO)_4}{170.73g/mol}\\\\\text{Mass of }Ni(CO)_4=(26.94mol\times 170.73g/mol)=4599.5g

Hence, the mass of Ni(CO)_4 allowable in the laboratory is 4599.5 grams

3 0
3 years ago
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