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3 years ago

I NEED HELP PLEASE FAST, BRAINLIEST! :) What's unique about the freezing of water?

Chemistry

1 answer:

Gnom [1K]3 years ago

6 0

Answer:

Instead of contracting and sinking, ice expands and floats. Ice on top of a pond or lake help protect water plants and fish during very cold weather. They live securely beneath the ice until melts in warmer weather

Explanation:

it helps the plants survive and preserves life

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How does your Skeletal and Muscular Systems work together?

elena-s [515]

Answer:

Answer would be A, Muscles move your bones

Explanation:

Without the Muscular System, your bones would not be connected properly

3 0

3 years ago

Read 2 more answers

Which compound are ionic and which are covalent? (N2) (CCl4) (SiO2) (AlCl3) (CaCl2) (LiBr)

muminat

Covalent compounds: N2, CCl4, SiO2 and AlCl3.

Ionic compounds: CaCl2 and LiBr.

Hope this helps!

3 0

3 years ago

1. Which of the following does NOT indicate that a chemical change may have taken place?

mojhsa [17]

A fracture Formation .
A matter is neither destroyed or created

8 0

3 years ago

What properties can be used to identify substance and why?

Elena L [17]

Answer:

All substances can be characterized by their unique sets of physical and chemical properties. Properties that can be determined without changing the composition of a substance are referred to as physical properties. Characteristics such as melting point, boiling point, density, solubility, color, odor, etc.

3 0

3 years ago

Last question<br> help<br> im confusion

Andrej [43]

Remark

The given thing on the right is a positron. The mass for these subatomic particles is considered to be 0. It's atomic number is 1 which means it is a blood relative of a proton.

So essentially what happens is that X is one space to the left on the periodic table. But let's solve this a little bit more formally.

Solution

$_{65}^{147}\text{Tb}\longrightarrow _{z}^{y}\text{x} +_{1}^{0}{e}$

y stays the same at 147. It is z that changes.

65 = z + 1 Subtract 1 from both sides.

64 = z

So the chemical with 64 as its position on the periodic table is

Gadolinium and the answer is C

5 0

3 years ago