1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mr_godi [17]
3 years ago
10

Humans have used rocks in the creation of tools and building materials true or flase

Chemistry
2 answers:
olga55 [171]3 years ago
8 0

Answer:

true

Explanation:

Anuta_ua [19.1K]3 years ago
4 0
True, if you would like an example look at Indian arrow heads or early architecture all use rocks.
You might be interested in
The combustion of carbohydrates and the combustion of fats are both exothermic processes, yet the combustion of carbohydrates is
Julli [10]

Explanation:

There are two aspects of a reaction:

Thermodynamics:

Combustion of the compound is reaction with oxygen.

The carbohydrates contain more content of oxygen as compared to fats.

Hence, carbohydrates have lot of oxygen content which are already partially oxidized as compared to fats. Hence, combustion of the carbohydrates is a faster process.

Kinetics:

The molecular reacts also shows that the combustion of the carbohydrates is a faster process.

7 0
3 years ago
Describe the kinetic energy/ movement of the particles in plasma.
exis [7]
kinetic energy is a moving object potential energy is stored energy
8 0
3 years ago
Read 2 more answers
Please help me I really need help
Mars2501 [29]

Answer:

c

Explanation:

chemically changed

hope it helps!!

8 0
3 years ago
Read 2 more answers
1. If Susan reproduced asexually what would be the outcome if she had offspring? What would they look like?​
wel

Answer:

They would look exactly like her, when you produce asexually your offspring is a clone of you. The offspring is genetically identical to the parent.

Explanation:

3 0
3 years ago
A sample of solid sodium hydroxide, weighing 13.20 grams is dissolved in deionized water to make a solution. What volume in mL o
Andreas93 [3]
<h3>Answer:</h3>

2.809 L of H₂SO₄

<h3>Explanation:</h3>

Concept tested: Moles and Molarity

In this case we are give;

Mass of solid sodium hydroxide as 13.20 g

Molarity of H₂SO₄ as 0.235 M

We are required to determine the volume of H₂SO₄ required

<h3>First: We need to write the balanced equation for the reaction.</h3>
  • The reaction between NaOH and H₂SO₄ is a neutralization reaction.
  • The balanced equation for the reaction is;

2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

<h3>Second: We calculate the umber of moles of NaOH used </h3>
  • Number of moles = Mass ÷ Molar mass
  • Molar mass of NaOH is 40.0 g/mol
  • Therefore;

Moles of NaOH = 13.20 g ÷ 40.0 g/mol

                          = 0.33 moles

<h3>Third: Determine the number of moles of the acid, H₂SO₄</h3>
  • From the equation, 2 moles of NaOH reacts with 1 mole of H₂SO₄
  • Therefore, the mole ratio of NaOH: H₂SO₄ is 2 : 1.
  • Thus, Moles of H₂SO₄ = moles of NaOH × 2

                                    = 0.33 moles × 2

                                   = 0.66 moles of H₂SO₄

<h3>Fourth: Determine the Volume of the acid, H₂SO₄ used</h3>
  • When given the molarity of an acid and the number of moles we can calculate the volume of the acid.
  • That is; Volume = Number of moles ÷ Molarity

In this case;

Volume of the acid = 0.66 moles ÷ 0.235 M

                                = 2.809 L

Therefore, the volume of the acid required to neutralize the base,NaOH is 2.809 L.

7 0
3 years ago
Other questions:
  • The voltage of a battery can be changed by altering the _____
    12·1 answer
  • What diseases are spread in warm temperatures?
    8·2 answers
  • A 50 ml volumetric flask is calibrated to the _______ and will hold exactly _________ when filled to the calibration line: 0.01
    13·2 answers
  • The picture below shows 3 sets of balloons, all with a particular charge. Which of the picture(s) is true? Explain.Then explain
    12·1 answer
  • What is the most abundant gas in the atmosphere is _____. argon oxygen nitrogen hydrogen
    7·2 answers
  • The number of electrons in an oxide ion O^2- is?
    7·1 answer
  • How does the snake's skull allow it to eat large prey?
    14·1 answer
  • PLEASE HELP NEED HELP ASAP Which of the answers correctly completes the following statement? __________ chemical bonds requires
    13·1 answer
  • Question 2 (1 point)<br> Which state of matter has the lowest density and the highest energy?
    10·1 answer
  • 10 points<br><br> How many more oxygen atoms are in 3Mg3(PO4)2 than in 4Al2O3?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!