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3 years ago

I have to make the equation equal but I don’t know how to make the H equal but you can’t change the chemical formula

Mathematics

1 answer:

Firdavs [7]3 years ago

4 0

Answer:

Ca(OH)2 + 2 HBr = CaBr2 + 2 H2O

Step-by-step explanation:

Is it H2O2 on the right side and HBr2 on the left side?

Then there is no solution.

I think the formula must look like

Ca(OH)2 + HBr = CaBr2 + H2O

You have 2 Br on the right side then it must be 2 HBr on the left side.

Ca(OH)2 + 2 HBr = CaBr2 + H2O

You have 4 Hs and 2 Os on the left side then it must be 2 H2O on the right side.

Ca(OH)2 + 2 HBr = CaBr2 + 2 H2O

Now everything looks fine.

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If jill climed 100 feet more how many feet above sea level would she be

Anit [1.1K]

You have to have a better question to answer that, 100 feet more what?

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3 years ago

A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained p

wel

Answer:

A sample size of 1380 should be obtained.

Step-by-step explanation:

Minimum sample size:

The minimum sample size is of:

$n = (\frac{z}{E})^2(p_1(1-p_1) + p_2(1-p_2))$

In which z is the critical value, related to the confidence level, E is the desired margin of error, $p_1$ and $p_2$ are the proportions.

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

Estimates of 22.6% male and 18.1% female from a previous year

This means that $p_1 = 0.226, p_2 = 0.181$ .

Within 3 percentage points, minimum sample size:

This is n for which $E = 0.03$ . So

$n = (\frac{z}{E})^2(p_1(1-p_1) + p_2(1-p_2))$

$n = (\frac{1.96}{0.03})^2(0.226*0.774 + 0.181*0.819)$

$n = 1379.4$

Rounding up:

A sample size of 1380 should be obtained.

8 0

3 years ago

Simplify. 5(22 - 9 · 2) - 2( 3 · 2 4) 7 <br> a.-99 <br> b.-83 <br> c.-75 <br> d.-71

Pachacha [2.7K]

Not completely sure on the symbols, but I think it is 5 x ( 22 - 9 x 2 ) - 2 ( 3 x 2 x 4 ) x 7 = 136. It doesn't really match the answers, so my advice is that you use a calculator for this one, or as the person/teacher who gave you the problem how to solve it.

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3 years ago

*ANSWER QUICK PLEASE*

I am Lyosha [343]

Answer:

Step-by-step explanation:

Add up these numbers. Then do 180-107

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3 years ago

McDonald's sell milkshakes in two sizes a small milkshake contains 300ml and a large milkshake contains 2/3 more, how much does

ad-work [718]

1/3 is 3/3 so 300/3 is 100 so 2/3 is 200 ml more so it holds 500 ml

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3 years ago