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8090 [49]
3 years ago
6

Malia is interested in observing cognitive development in children and wants to design a study that will allow her to observe sm

all changes in how 6-year-olds learn to solve problems. She plans to collect data from each child every week for three months.
Which design is her best choice?

A] microgenetic
B] cross-sequential
C] cross-sectional
D] longitudinal
Chemistry
1 answer:
jarptica [38.1K]3 years ago
8 0

Answer: Microgenetic

Explanation: I just took the test :3

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Which of the following is an example of a compound?<br><br> CaCl2<br><br> Na<br><br> Nd<br><br> Cu
madam [21]
CaCl2

All of the other choices are elements
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Explain why the statement “The speed of light is 300 million m/s” is not always correct.
levacccp [35]

Because the speed of light is determined by the medium that is it in. If light is in a vacuum it goes 300 million meters per second but it is slower in air, and even slower in water because water is more dense than the previous two.

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2 years ago
What is the percentage composition of each element in dinitrogen monoxide, N2O?
Kitty [74]

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4 0
3 years ago
Read 2 more answers
15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the perc
Helen [10]

Answer:

35.7%

Explanation:

The percent yield is calculated by the formula:

<em>[(actual yield) / (theoretical yield)] * 100</em>

In this case, the actual yield is 0.15 grams, and the theoretical yield is 0.42 grams. So, putting these values into the equation, we have:

\frac{0.15}{0.42} *100=0.357*100=35.7

Thus, the percent yield of H_2 is 35.7%.

Hope this helps!

8 0
3 years ago
Can you help me balance this​
Zepler [3.9K]

Balanced equation

Mg₃(PO₄)₂ + 2Al(NO₃)₃ → 3Mg(NO₃)₂ + 2AlPO₄

<h3>Further explanation</h3>

Given

Reaction

Mg3(PO4)2 + Al(NO3)3 → Mg(NO3)2 + AlPO4

Required

Balanced equation

Solution

Give a coefficient :

Mg₃(PO₄)₂ + aAl(NO₃)₃ → bMg(NO₃)₂ + cAlPO₄

Make an equation :

Mg, left = 3, right=b⇒b=3

P, left=2, right=c⇒c=2

Al, left=a, right=c⇒a=c⇒a=2

The reaction becomes :

Mg₃(PO₄)₂ + 2Al(NO₃)₃ → 3Mg(NO₃)₂ + 2AlPO₄

7 0
3 years ago
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