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
rusak2 [61]
3 years ago
8

ASAP in middle of test will mark brainLIEST Which family in the periodic table has metals that are usually harder than other met

als?
Alkali metals
Alkaline earth metals
Lanthanide series
Transition metals
Chemistry
1 answer:
GREYUIT [131]3 years ago
3 0
The correct answer is alkaline metals
You might be interested in
Someone please help me I will give BRAINLIST
blsea [12.9K]
  1. b
  2. d
  3. e
  4. a
  5. c
  6. f

    7.g

well there is your answers

3 0
2 years ago
Read 2 more answers
Earth Science
KIM [24]
The first one is D, the second one is A and the last is C and D
6 0
2 years ago
را
Aloiza [94]

Answer:

A.It is the same for every sample of a single substance.

Explanation:

7 0
3 years ago
22.4 L is the volume of any gas regardless of atmospheric conditions.<br><br> O True<br><br> O False
Contact [7]
This is false. One mole of a gas occupies 22.4 L at STP, which is taken to be 0°C (273 K) and 1 atm. If atmospheric conditions depart from these values, this assumption cannot be used.
8 0
3 years ago
The decomposition of HBr(g) into elemental species is found to have a rate constant of 4.2 ×10−3atm s−1. If 2.00 atm of HBr are
Dennis_Churaev [7]

Answer:

7,94 minutes

Explanation:

If the descomposition of HBr(gr) into elemental species have a rate constant, then this reaction belongs to a zero-order reaction kinetics, where the r<em>eaction rate does not depend on the concentration of the reactants. </em>

For the zero-order reactions, concentration-time equation can be written as follows:

                                          [A] = - Kt + [Ao]

where:

  • [A]: concentration of the reactant A at the <em>t </em>time,
  • [A]o: initial concentration of the reactant A,
  • K: rate constant,
  • t: elapsed time of the reaction

<u>To solve the problem, we just replace our data in the concentration-time equation, and we clear the value of t.</u>

Data:

K = 4.2 ×10−3atm/s,  

[A]o=[HBr]o= 2 atm,  

[A]=[HBr]=0 atm (all HBr(g) is gone)

<em>We clear the incognita :</em>

[A] = - Kt + [Ao]............. Kt =  [Ao] - [A]

                                        t  = ([Ao] - [A])/K

<em>We replace the numerical values:</em>

t = (2 atm - 0 atm)/4.2 ×10−3atm/s = 476,19 s = 7,94 minutes

So, we need 7,94 minutes to achieve complete conversion into elements ([HBr]=0).

6 0
3 years ago
Other questions:
  • Assume that each tablet's mass was 1,000 mg, and remember that you used 0,200 L of water each time,
    12·2 answers
  • Why do all atoms of an element have the same atomic number, although they may have different mass numbers?. What do we call atom
    6·1 answer
  • What is y'alls favorite Call of Duty Zombies map?
    5·2 answers
  • Describe the profile you would expect for a biological catalyst. Complete the sentences to explain why an enzyme is different th
    11·1 answer
  • Suppose your bedroom is 21 ft long, 17 ft wide, and the distance from floor to ceiling is 7 ft, 6 in. You need to know the volum
    5·1 answer
  • SnO2 + 2H2 → Sn + 2H2O
    13·1 answer
  • It requires 2,500 joules to raise a certain amount of water (c = 4.186J/g°C) from 20.0°C to 65.0°C.
    12·1 answer
  • Which statement best explains why cells separate and expel waste?
    12·1 answer
  • Identify ways to reduce the risk of liquid bumping while heating.
    12·1 answer
  • Follow these steps:
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!