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
Veseljchak [2.6K]
3 years ago
13

What kind of tools did prehistoric people make with flint

Chemistry
1 answer:
barxatty [35]3 years ago
3 0
Spears and knives (Plz thank me if this helped)
You might be interested in
Write the Ka expression for an aqueous solution of hydrofluoric acid: (Note that either the numerator or denominator may contain
damaskus [11]

Answer:

Ka = ( [H₃O⁺] . [F⁻] ) / [HF]

Explanation:

HF is a weak acid which in water, keeps this equilibrium

HF (aq)  +  H₂O (l)  ⇄  H₃O⁺ (aq)  +  F⁻ (aq)      Ka

2H₂O (l)  ⇄  H₃O⁺ (l)  +  OH⁻ (aq)   Kw

HF is the weak acid

F⁻ is the conjugate stron base

Let's make the expression for K

K = ( [H₃O⁺] . [F⁻] ) / [HF] . [H₂O]

K . [H₂O] = ( [H₃O⁺] . [F⁻] ) / [HF]

K . [H₂O] = Ka

Ka, the acid dissociation constant, includes Kwater.

4 0
2 years ago
A football field is 120 yards by 53.333 yards. What is the area of the football field in acres if 1 acre=43560 ft?? Use correct
maw [93]

Answer:

1.3223 acres

Explanation:

a football field's area is 360 feet (120 yards) x 160 feet (53.333 yards) = 57,600 sq. feet

if the area of an acre is 43,560 sq. feet, then a football field in acres = 57,600 sq. feet / 43,560 sq. feet = 1.3223 acres

we can verify our answer by doing the same calculation in sq. yards:

football field = 120 yards x 53.33 yards = 6,400 sq. yards

an acre is 4,840 sq. yards

football field in acres = 6,400 sq. yards / 4,840 sq. yards = 1.3223 acres

8 0
3 years ago
Read 2 more answers
A scientist investigates a new substance and finds that at 35° C, 146.2 grams will dissolve in 200.0 grams of water. Which simil
Nimfa-mama [501]
The scientist's results is that at a temperature of 35<span>°C, the solubility of the substance in water is 146.2 grams in 200 grams of water. There isn't really a different method to determine the solubility of a substance in water. Another procedure could be that a lesser amount of the substance is used and the water required to dissolve it is determined. The solubility of the substance based on the two procedures can then be compared.</span>
5 0
3 years ago
HELP ASAP!!!!!!!
Mrrafil [7]

"One has more oxygen atoms than the other" best distinguishes carbon dioxide from carbon monoxide

<u>Explanation</u>:

In both carbon monoxide and carbon dioxide, there is the presence of carbon and oxygen. However,they vary depending on the number of oxygen atoms.In carbon monoxide, there is the presence of one only  carbon and oxygen atom. Thus carbon monoxide is chemically represented as CO. Only about 0.2%ppm of carbon monoxide present in air.  carbon monoxide is toxic and causes death in human when not consumed is correct proportion.

Whereas in carbon dioxide, only one carbon atom,and two oxygen atom and hence chemically represented as co2.

3 0
2 years ago
Can someone please tell me how to speed up a chemical reaction??
Alex787 [66]

Increasing temperature speeds up a reaction because there are more collisions and the collisions have higher energy. Catalysts speed up reactions by increasing the number of successful collisions. Catalysts are not used up in a reaction. Smaller particles have a larger surface area.

7 0
3 years ago
Other questions:
  • The highly reactive elements in group 7a are known for forming salts.what are they called
    13·1 answer
  • Convert 2.17 x 10 -8 Mg into pg
    15·1 answer
  • If 45.6 grams of water decompose at 301 Kelvin and 1.24 atmospheres, how many liters of oxygen gas can be produced? Show all of
    14·1 answer
  • Find the equation of the line passing through the points (2, 1) and (5, 10).​
    8·1 answer
  • 5F248+ 2NH3(8) ► NF418 + 6HF
    13·1 answer
  • What is nitrogens formula​
    6·2 answers
  • What do you mean by electronegativity ?​
    10·2 answers
  • What happens to the ionizing rate if the steps of ionizing polyprotic acid increases?
    5·2 answers
  • IUPAC NAME FOR:<br>CH2(OH)-CH2-CH(C2H5)-OH
    5·1 answer
  • The air in the balloon is heated up by leaving it in a warm place. Give two efects that this has on the air particles.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!