25.367 + 15.08 sig fig

Answers

Answer 1

Answer:

Answer: I think the answer is 40.45 please let me know if it's wrong

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A student gains 1.0 lb in two weeks. How many grams did he gain?Express your answer to two significant figures and include the appropriate units.

I don’t know

Answers

In 1 lb there are 450 grams (Rounded upto 2 - Significant figures).

We havea weight gain of 1.0 lb.

We have to convert it into grams.

How many grams are there in 1 lb?

I lb = 453.592 grams

According to the question -

A = 1 lb

Converting it into grams, we get -

1 lb = 1 x 453,592 = 453.592 grams

Rounding up to 2 - Significant figures, we get -

1 lb = 450 grams

Hence, in 1 lb there are 450 grams (Rounded upto 2 - Significant figures).

To solve more questions on unit conversions, visit the link below-

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1lb= 453.592g but then to change to 2 significant figures you go down two of the numbers so here it will be 4 and 5 that stands for 450g. So he gained 450g. I hope that helped

How do we know that caramelizing sugar is a chemical change ?

Answers

Chemical transformation: it's all transformation changes the composition of matter, i.e. that matter produces a new substance with different initial properties burning sugar to make caramel, we cannot retrieve the initial sugar.

hope this helps!

Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI

Answers

You can compare the strength of the hydrogen bonding by comparing the electronegativities of the other elements. All the four elements, Br, F, Cl and I belong to the same group in the periodic table: group 17 named halogens. Then the kind of bonding they form is similar: polar covalent. You must know the trend of the electronegativities in the periodic table. Electronegativity decrease when you down across a group. Then the electronegativity of F is the higher of the group (indeed, it is the highest of all the 118 elements) . The higher the electronegativity the stronger the attraction that the halogen attracts the electrons and the stronger the hydorgen bonding. Then, the conclusion is that HF has the strongest hydrogen bonding.

The correct answer is HF

How many elements are in a set whole numbers between 3 and 15

Answers

The set of elements composed of whole numbers between 3 and 15 consists of 4, 5, 6,7,8,9, 10, 11,12,13,14. Counting these, the number of elements is 11.

Which of the following is a producer? A.a crow that consumes a dead animal on the side of a road

B.a fish that eats smaller fish for its food

C.a giraffe that eats the leaves of trees

D.a plant that has insect larvae feeding on its roots

Answers

D. a plant that has insect larvae feeding on its roots.

The shape of a molecule is tetrahedral. How many lone pairs are most likely on the central atom?zero
two
three
four

Answers

Answer: Zero lone pairs on the central atom.

Explanation:

Lone pairs and bond pairs together decides the geometry of the molecule.
Bond pairs together decides the shape of the molecule.

The molecule is with with tetrahedral shape which means that molecule has a tetrahedral geometry.

The value of number of electrons around the central atom with tetrahedral geometry according to VESPR theory is '4'. Which means that electrons around the central atom are 4.

Since, the molecule is in tetrahedral shape which means four bonds are pointing in direction towards the four vertices of tetrahedral which means their are zero lone pair present on the central atom.

The number of lone pairs that are most likely found on the central atom is zero. There are no lone pairs found on the central atom.

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