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
taurus [48]
3 years ago
8

True or False. Physical changes result in the formation of a new substance.

Chemistry
1 answer:
Umnica [9.8K]3 years ago
3 0

Answer:

1. false

2. true

Explanation:

I hope this helps

You might be interested in
Write the balanced equation for a reaction between aqueous nitric acid (HNO3) and solid lithium metal (this is a single replacem
Lemur [1.5K]

<u>Answer:</u> The equation is given below.

<u>Explanation:</u>

Single replacement reactions are the chemical reactions in which more reactive metal displaces a less reactive metal from its chemical reaction. General equation for these reactions is given by the equation:

A+BC\rightarrow AC+B

Metal A is more reactive than metal B.

The reactivity of metals is judged with the help of reactivity series. In this series, the metals lying above are more reactive than the metals which lie below in the series.

For the reaction of solid lithium metal and nitric acid, the equation follows:

3Li(s)+4HNO_3(aq.)\rightarrow 3LiNO_3(aq.)+2H_2O(l)+NO(g)

This is a type of single replacement reaction because Lithium (more reactive metal) is replacing Hydrogen (less reactive metal) from the chemical reaction.

3 0
3 years ago
Which statemate explains the process of a chemical reaction
Snowcat [4.5K]

It is, Reactants react to produce new substances known as products.

because a chemical reaction is the combining of different reactants

5 0
3 years ago
A silver necklace is made from a pure sample of silver that is free of I'm purities. Which term or terms could be used to descri
geniusboy [140]
The terms that apply to this silver necklace are:
pure chemical substance
element

The necklace consists purely of silver, making it a pure chemical substance; moreover, silver itself is an element, not a compound. Therefore, the term element is also fitting for the necklace.
5 0
3 years ago
a sample of an unknown metal has a mass of 21.6g and volume of an 8.00cm3 calculate the density of the unknown metal
Strike441 [17]

Answer:

<h2>2.70 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

From the question we have

density =  \frac{21.6}{8}  \\  = 2.7

We have the final answer as

<h3>2.70 g/cm³</h3>

Hope this helps you

4 0
2 years ago
Dry ice, CO2(s), does not melt at atmospheric pressure. It sublimes at a temperature of −78 °C. What is the lowest pressure at w
kirill115 [55]
You need to use the equation PV = nRT

The only “trick” in these problems is you need to use the correct UNITS. Especially for the “R” value.

If you get the units (eg temps in Celsius or Kelvin) corresponding to the correct “matching” units of the other variables.

You need to convert the temp into Kelvin first
4 0
2 years ago
Other questions:
  • A 5.0 gram sample of Ag2SO4, will dissolve in 1.0 L of water. Calculate the solubility product
    12·1 answer
  • Trichloroethylene, a widely used degreasing solvent for machine parts, is produced in a two-step reaction sequence. Ethylene is
    15·2 answers
  • A/1 * B/C =D, You find yourself with 17 guilders (a gold coin) but you are planning on taking a trip to a country where the loca
    14·2 answers
  • In the equation CH4 + 2O2 --&gt; 2H2O + CO2 What is the mass of CO2 produced when 35g of O2 reacts?
    12·1 answer
  • C
    11·1 answer
  • Is a CAS number a physical or chemical property
    6·1 answer
  • A gas occupies a volume of 160 ml at 36° C and 970mm Hg. What is the volume at STP?
    12·1 answer
  • Sunflower oil has a density of 0.920 g/mL. What is the mass of 4.50 L of sunflower oil? What volume (in L) would 375g of sunflow
    12·1 answer
  • Lab Report
    7·1 answer
  • The average kinetic of a gas remains the same when A. It’s volume is decreased B. It’s tell us decreasedC. It’s tell is increase
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!