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3 years ago

Help with this question I got so confused 30 points

Chemistry

2 answers:

coldgirl [10]3 years ago

7 0

The answer is B because they all have leaves

frutty [35]3 years ago

6 0

Answer:

B:the second answer

Explanation:

Because the all have leaves

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10 points Which of these is the best example of heat transfer by radiation? *

insens350 [35]

Answer:

a) A satellite is warmed by sunlight.

Explanation:

Heat transfer by radiation mostly involves heat gain or heat loss from the Sun. In this case, Option A is the only option where sunlight is involved so it is the best example of heat transfer by radiation.

3 0

2 years ago

Be sure to answer all parts. Fluoride ion is poisonous in relatively low amounts: 0.2 g of F− per 70 kg of body weight can cause

Stells [14]

Answer:

200 liters of fluoridated drinking water would have to be consumed by as person to reach the toxic level.

Explanation:

Toxic level of fluoride ions = 0.2 g per 70 kg body weight

Concentration of fluoride ions in drinking water = 1 mg/ L = 0.001 g/L

1 mg = 0.001 g

Let the volume of drinking water consumed by person to reach the toxic level of fluoride concentration be V.

For 70 kg body weight 0.2 grams of fluoride ions will be toxic.

$V\times 0.001 g/L=0.2 g$

$V=\frac{0.2 g}{0.001 g/L}=200 L$

200 liters of fluoridated drinking water would have to be consumed by as person to reach the toxic level.

7 0

3 years ago

Which is the best molecule to build collegen, muscle repair, and tendon repair?

Licemer1 [7]

Answer:

Explanation:

collagen is made of proteins

4 0

3 years ago

How many moles of Ca(OH)2 are needed to make 2.5 moles of CaCl2?

barxatty [35]

Explanation:

CaCl2 ⇄ Ca-²+2Cl-¹

1mole⇄1mole+2moles

So from above ..

1mole CaCl2 produce 1mole Ca-² & 2 moles of Cl-².

For 2.5 moles we multiply the above chemical eq. With 2.5

2.5CaCl2⇄2.5Ca-²+5Cl-¹

So from 2.5 moles of CaCl2 we get 2.5 mole calcium ion and 5 moles chloride ion…

5 0

2 years ago

What is the ionic bonding of NaCl

madam [21]

Na has a one proton over than electrons.so Na makes a Na+
Cl has a one electron overthan protons.so Cl makes a Cl-

proton has a + affectation
electron has a - affectation ..

8 0

3 years ago