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
mezya [45]
3 years ago
11

Which of these substances are compounds? How do you know?

Chemistry
1 answer:
tankabanditka [31]3 years ago
7 0
Salt because it's a solid and helium and nitrogen are gases.
Water is a liquid because it's form can change.
You might be interested in
What is the mass in grams of a pure iron cube that has a volume of 4.60 cm3
yuradex [85]
In order to determine the mass of a substance given the volume, we require the density. The density of iron is 7.87 grams/cm³

Now,

Density = mass / volume

Mass = density * volume

Mass = 7.87 * 4.6

36.2 grams of iron are present in the cube
5 0
3 years ago
Explain how you would calculate the q for warming 100.0 grams of liquid water from 0°C to 100 °C.
mojhsa [17]

Answer:

mass = 100 g

T1 = 0°C

T2 = 100 °C

C = 1 cal/g°C

Q = mC(T2 -T1)

Q = 100(1)(100 - 0)

Q = 100(100)

Q = 10000 cal

Explanation:

6 0
2 years ago
Check the boxes next to events or trends that first occurred in science from about 1700. Darwin published his theory of natural
marishachu [46]

Check the boxes next to events or trends that first occurred in science from about 1700.

X Darwin published his theory of natural selection.

-Darwin published his work in 1859.

X Archimedes described the principle of the lever.

-Archimedes discovered this during the third century BC (300-201 BC)

/ Scientific societies and academies were formed.

-These were formed around 1789

X The double-helix structure of DNA was determined.

<span> -IT was discovered in 1953 by James Watson and Francis Crick.</span>

X Copernicus proposed a Sun-centered universe.

<span>-It was proposed in the 16th century.</span>

X Continental drift was explained by the theory of plate tectonics.

<span> -It was proposed at around 1910 till 1950 but was accepted at 1960. </span>

X The Earth was proven to be spherical.

-It was argued at around 384-322 BC.

4 0
2 years ago
Read 2 more answers
List a possible set of four quantum numbers (n,l,ml,ms) in order, for the highest energy electron in gallium?
Elena-2011 [213]
Gallum: Z = 31

electron configuration: [Ar] 4s^2 3d10 4s2 4p1

Highest energy electron: 4p1

Quantum numbers:

n = 4, because it is the shell number
l = 1, it corresponds to type p orbital 
ml = may be -1, or 0, or +1, depending on space orientation, they correspond to px, py, pz
ms = may be -1/2 or +1/2, this is the spin number. 
7 0
2 years ago
How did Mendeleev arrange the known elements?
Agata [3.3K]
In order of relative atomic mass.
4 0
3 years ago
Read 2 more answers
Other questions:
  • En que consiste cada familia de la tabla periódica?
    12·1 answer
  • What is the relationship between a problem statement and the hypothesis?
    11·1 answer
  • What does the nucleus of a atom contain?
    15·1 answer
  • When do chemicals bond form
    6·1 answer
  • Hydrogen and helium in the universe were formed by which of these phenomena?
    11·1 answer
  • Help me with all 6 question
    7·2 answers
  • If a horse gallops 1 meter per second, how far can it travel in 1 minute? <br><br> pls help
    5·1 answer
  • S308<br> what’s the name to this
    8·1 answer
  • What are metals in chemistry
    14·2 answers
  • A scientific experiment requires that the temperature be lowered at a steady and gradual rate. The beginning temperature is 34°
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!