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
TiliK225 [7]
3 years ago
10

Hello, I would really appreciate it if you guys can answer the question below, it is for marks and I do not know the answer for

this one so please help I only have 19 min left.

Chemistry
1 answer:
Taya2010 [7]3 years ago
3 0

Answer:

Two human needs are food and water. We need food to survive so we dont starve to death. And water is most important because without water after around five days, you die. Heat technology could be fire. We use fire to distill salt water. Distilling salt water boils the bacteria and so it would be safe to drink. We also use fire to cook the food we have gotten or hunted so we dont get infected with deadly bacteria and viruses.

Explanation:

Hope this helps. Have a nice day!

You might be interested in
Which statement best describes how dynamic equilibrium relates to a saturated solution of sodium chloride? The concentration of
kati45 [8]
<span>Each second, solid sodium chloride dissolves and solid sodium chloride recrystallizes. </span>
4 0
3 years ago
Read 2 more answers
Which wind belt do we live in<br>​
vesna_86 [32]

Answer:

the wind belt one

Explanation:

mhm

4 0
3 years ago
Read 2 more answers
What happens to the electron configuration when you move down a family?
stiv31 [10]

Answer:

The number of energy levels increases as you move down a group as the number of electrons increases.

Explanation:

Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase. 2) As you move across a period, atomic radius decreases.

4 0
2 years ago
What is the density of chlorine gas (MM = 71.0glmol) at 1.50 atm and 25.0C
IrinaVladis [17]

Answer: D=4.35g/L

Explanation:

The formula for density is D=\frac{M}{V}. M is mass in grams and V is volume in liters.

Since we are give pressure and temperature, we can use the ideal gas law to find moles/volume. FInding moles/volume would give us the base for density. All we would have to do is convert moles to grams.

Ideal Gas Law: PV=nRT

\frac{n}{V} =\frac{P}{RT}

\frac{n}{V}=\frac{1.50 atm}{(0.08206Latm/Kmol)(25+274.15K)}

\frac{n}{V} =\frac{0.061309mol}{L}

Now that we have moles, we can use molar mass of chlorine gas to find grams.

0.061309mol*\frac{71.0g}{mol} =4.3529g

With our grams, we can find our density.

D=\frac{4.3529g}{L}

We need correct significant figures so our density is:

D=\frac{4.35g}{L}

5 0
3 years ago
All of the following statements are correct except The conversion of compounds into elements is a chemical change. The conversio
aleksandrvk [35]

Answer:

The conversion of liquid water into gaseous water is a chemical change

Explanation:

A chemical change occurs when there is a chemical reaction, so there'll be changed in the compounds, such as forming new ones, forming its elements, or elements forming compounds.

A physical change occurs when there is a change in the state of aggregation of the compound, it means that it changes its physical state. Solid for liquid, liquid for solid, liquid for gas, gas for liquid, solid for gas, and gas for solid are the physical changes.

So the evaporation of water, or its conversion in gaseous water, is a physical change, not a chemical change.

6 0
3 years ago
Other questions:
  • Methionine, ch3sch2ch2ch(nh2)co2h, is an amino acid found in proteins. draw a lewis structure of this compound. what is the hybr
    5·1 answer
  • 1: Copper has an atomic number of 29
    12·2 answers
  • g What is the rate law for the elementary step OH+H2→H+H2OOH+H2→H+H2O? What is the rate law for the elementary step ? Rate=k[H2]
    15·1 answer
  • Water can resist a greater external force than ethanol can. Which statement best describes this difference? Water has less capil
    13·2 answers
  • when 0.863 mol acetone is dissolved in 500 g benzene, the freezing point of benzene drops 8.84°C. what is the molal freezing poi
    13·1 answer
  • PORFA AYUDAA !!!
    6·1 answer
  • What are all the ways that a substance can change state?
    12·2 answers
  • Use the drop-down menus to complete each statement.
    9·1 answer
  • I'd: 9872093250, password: qqqqq, join the meeting​
    9·2 answers
  • The difference between oxygen and ozone
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!