CHEMISTRY HIGH SCHOOL

Which of these are physical changes in matter check all that apply .

Answers

Answer 1

Answer:

Answer:

boiling water

sharpening a pencil

freezing water

Answer 2

Answer:

What answers are there? you didn't add them.

physical change and chemical change.

physical change affects a substance's physical properties, and a chemical change affects its chemical properties.

Related Questions

Which balanced equation represents a chemical change?(1) H2O(l) + energy → H2O(g)(2) 2H2O(l) + energy → 2H2(g) + O2(g)(3) H2O(l) → H2O(s) + energy(4) H2O(g) → H2O(l) + energy
505 grams of KOH are required to completely react with 4.50 mole of sulfuric acid. How many moles of products are produced?
The octet rule states that,in chemical compounds,atoms tend to have
The solubility of KCl(s) in water depends on the(1) pressure on the solution(2) rate of stirring(3) size of the KCl sample(4) temperature of the water
An increase in the surface area of reactants in a heterogeneous reaction will result in what?

Look at the equation below.O2 + CS2 → CO2 + SO2

Which of the following shows the equation balanced?
A. 3 O2 + CS2 → CO2 + 2 SO2

B. 3 O2 + CS2 → 2 CO2 + SO2

C. O2 + CS2 → CO2 + SO2

D. 4 O2 + 4 CS2 → 4 CO2 + 4 SO2

Answers

Answer:

Look at the equation below.

$O_(2) +CS_2$ → $CO_2+SO_2$

The equation balanced is:

A. $3O_2+CS_2$ → $CO_2+2SO_2$

Explanation:

The equation balanced is:

$3O_2+CS_2$ → $CO_2+2SO_2$

This can be proved with the amount of atoms of each element in reagents and products:

Reagents:

O=6

C=1

S=2

Products:

O=6

C=1

S=2

The option that shows the that the equation is balanced is:

3O₂ + CS₂ → CO₂ + 2SO₂ (option A)

How to balance the equation?

The equation O₂ + CS₂ → CO₂ + SO₂ can be balanced as shown below:

O₂ + CS₂ → CO₂ + SO₂

There are 2 atoms of S on the left side and 1 atom on the right. It can be balanced by writing 2 before SO₂ as shown below:

O₂ + CS₂ → CO₂ + 2SO₂

There are 2 atoms of O on the left side and a total of 6 atoms on the right. It can be balanced by writing 3 before as shown below:

3O₂ + CS₂ → CO₂ + 2SO₂

Now, we can see that the equation is balanced. Thus, the correct answer to the question is 3O₂ + CS₂ → CO₂ + 2SO₂ (option A)

Learn more about balancing equation:

brainly.com/question/12192253

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Which mixture will not yield hydrogen gas? (A) sodium and water
(B) calcium and water
(C) zinc and hydrochloric acid
(D) zinc and concentrated nitric acid
(E) steam and red hot iron

Answers

E) Steam and red hot iron

an organic compound on analysis yielded 2.04g carbon, 0.34g hydrogen, 2.73g oxygen. calculate the empirical formula

Answers

Answer:

CH2O

Explanation:

According to this question:

C = 2.04g

H = 0.34g

O = 2.73g

First, we divide the mass value of each element by its atomic mass to convert to moles.

C = 2.04g ÷ 12 = 0.17mol

H = 0.34g ÷ 1 = 0.34mol

O = 2.73g ÷ 16 = 0.17mol

Next, we divide by the smallest mole value (0.17):

C = 0.17mol = 0.17 = 1

H = 0.34mol ÷ 0.17 = 2

O = 0.17mol ÷ 0.17 = 1

The whole number ratio of C,H,O is 1:2:1, hence, the empirical formula is CH2O.

The Tacoma narrows bridge collapsed due to?A. Refraction
B. Reflection
C. Diffraction
D. Resonance

Answers

D. Resonance. the bridge was driven at its resonant frequency

Asbestos is commonly found in buildings and structures built before what year?

Answers

Asbestos is commonly found in buildings and structures built before the year 2000. This is because it was around this time that it was discovered that inhaling asbestos particles can lead to very serious diseases. It is a material found in many parts of a building or any infrastructure. A total ban of the material was implemented in 2000.

What does H2CO3 mean on the periodic table