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3 years ago

8

Which does not contain a lense

2 answers:

lawyer [7]3 years ago

7 0

Answer:

<u>A. Mirror </u>

Explanation: <u>I took the test</u>

ValentinkaMS [17]3 years ago

5 0

Answer:mirror

Explanations: A lens is a piece of a glass or other transparent substance with curved sides for concentrating , dispersing light rays used singly as in magnifying glass or with lenses therefore mirror doesn’t have lenses but telescope microscope and eyeglasses have

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How many sodium atoms in sodium sulfate.

Annette [7]

Answer:

7

Explanation:

Na2 SO4 is the chemical identity. You can count the number of atoms just by looking

5 0

2 years ago

What are they waiting? or what are their waiting?<br><br>please correct me if I'm wrong

kiruha [24]

Hm I’m confused, if you mean what are they weighting, it’s they :)

3 0

3 years ago

Which ph is more acidic, a ph of 3, a ph of 7, or a ph of 9?.

Andrei [34K]

Answer:

pH of 3.

Explanation:

pH 1 to 6 is acidic.

7 is neutral.

8 to 14 is alkaline

8 0

2 years ago

The molecular weight of a gas that has a density of 5.75 g/l at stp is __________ g/mol.

Ira Lisetskai [31]

Answer : The molecular weight of a gas is, 128.9 g/mole

Explanation : Given,

Density of a gas = 5.75 g/L

First we have to calculate the moles of gas.

At STP,

As, 22.4 liter volume of gas present in 1 mole of gas

So, 1 liter volume of gas present in $\frac{1}{22.4}=0.0446$ mole of gas

Now we have to calculate the molecular weight of a gas.

Formula used :

$\text{Moles of gas}=\frac{\text{Mass of a gas}}{\text{Molecular weight of a gas}}$

Now put all the given values in this formula, we get the molecular weight of a gas.

$0.0446mole=\frac{5.75g}{\text{Molecular weight of a gas}}$

$\text{Molecular weight of a gas}=128.9g/mole$

Therefore, the molecular weight of a gas is, 128.9 g/mole

8 0

3 years ago

Read 2 more answers

Predict which one of the following compounds would be insoluble in water.

quester [9]

CH4 is insoluble in water

4 0

3 years ago

Read 2 more answers