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djverab [1.8K]
3 years ago
13

You've made the hypothesis that the less rainfall a cactus plant gets, the taller it will grow, since cactuses like dry conditio

ns.
What is one thing that you should control in an experiment designed to test this hypothesis?
A. the height of the cactus plant
B. the hours of sunlight the cactus plants get
C. the number of cactus plants in the experiment
D. the amount of rain falling on the cactus plants
Chemistry
2 answers:
MrRa [10]3 years ago
8 0

B must be correct as that also affects growth. and i did this

gladu [14]3 years ago
6 0
B must be correct as that also affects growth
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Any force that causes an object to move in a circle is called a(n) a balanced force. b unbalanced force. c gravitational force.
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Answer- D. centripetal force

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The average atomic mass of Eu is 151.96 amu. There are only two naturally occurring isotopes of europium, Eu with a mass of 151.
earnstyle [38]

Answer:

The percentage abundance of Eu isotopes are 52 %  and 48 % .

Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope,:

% = x %

Mass = 151.0 amu

For second isotope :

% = 100  - x  

Mass = 153.0 amu

Given, Average Mass = 151.96 amu

Thus,

151.96=\frac{x}{100}\times {151.0}+\frac{100-x}{100}\times {153.0}

Solving for x, we get that:

x = 52 %

<u>Thus percentage abundance of Eu isotopes are 52 %  and 48 % .</u>

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3 years ago
4. Which is not an example of unbalanced forces acting on an object
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did you you know

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2CO + O2 --&gt; 2CO2
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Answer:

10 L of CO₂.

Explanation:

The balanced equation for the reaction is given below:

2CO + O₂ —> 2CO₂

From the balanced equation above,

2 L of CO reacted to produce 2 L of CO₂.

Finally, we shall determine the volume of CO₂ produced by the reaction of 10 L CO. This can be obtained as follow:

From the balanced equation above,

2 L of CO reacted to produce 2 L of CO₂.

Therefore, 10 L of CO will also react to produce 10 L of CO₂.

Thus, 10 L of CO₂ were obtained from the reaction.

3 0
3 years ago
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